CN113457293B - Arsenic-containing gas treatment device and high-arsenic metal mineral powder arsenic removal equipment - Google Patents
Arsenic-containing gas treatment device and high-arsenic metal mineral powder arsenic removal equipment Download PDFInfo
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- CN113457293B CN113457293B CN202110833072.4A CN202110833072A CN113457293B CN 113457293 B CN113457293 B CN 113457293B CN 202110833072 A CN202110833072 A CN 202110833072A CN 113457293 B CN113457293 B CN 113457293B
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- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 187
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 182
- 239000000843 powder Substances 0.000 title claims abstract description 169
- 229910052500 inorganic mineral Inorganic materials 0.000 title description 19
- 239000011707 mineral Substances 0.000 title description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 455
- 239000003546 flue gas Substances 0.000 claims abstract description 453
- 239000007789 gas Substances 0.000 claims abstract description 312
- 238000000197 pyrolysis Methods 0.000 claims abstract description 190
- 239000007787 solid Substances 0.000 claims abstract description 154
- 229960002594 arsenic trioxide Drugs 0.000 claims abstract description 49
- 229910000413 arsenic oxide Inorganic materials 0.000 claims abstract description 47
- 239000004744 fabric Substances 0.000 claims abstract description 39
- 238000000746 purification Methods 0.000 claims abstract description 39
- 238000009833 condensation Methods 0.000 claims abstract description 28
- 230000005494 condensation Effects 0.000 claims abstract description 28
- 239000000428 dust Substances 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 14
- KTTMEOWBIWLMSE-UHFFFAOYSA-N diarsenic trioxide Chemical compound O1[As](O2)O[As]3O[As]1O[As]2O3 KTTMEOWBIWLMSE-UHFFFAOYSA-N 0.000 claims abstract 9
- 238000007599 discharging Methods 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 30
- 238000002485 combustion reaction Methods 0.000 claims description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 239000000779 smoke Substances 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 15
- 238000001754 furnace pyrolysis Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000002341 toxic gas Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 238000002425 crystallisation Methods 0.000 abstract description 7
- 230000008025 crystallization Effects 0.000 abstract description 7
- IKWTVSLWAPBBKU-UHFFFAOYSA-N a1010_sial Chemical compound O=[As]O[As]=O IKWTVSLWAPBBKU-UHFFFAOYSA-N 0.000 description 39
- 238000000034 method Methods 0.000 description 27
- 238000002309 gasification Methods 0.000 description 22
- 238000005192 partition Methods 0.000 description 14
- 239000002912 waste gas Substances 0.000 description 8
- 238000004134 energy conservation Methods 0.000 description 4
- 231100000331 toxic Toxicity 0.000 description 4
- 230000002588 toxic effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 231100000167 toxic agent Toxicity 0.000 description 3
- 239000003440 toxic substance Substances 0.000 description 3
- GOLCXWYRSKYTSP-UHFFFAOYSA-N arsenic trioxide Inorganic materials O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229940093920 gynecological arsenic compound Drugs 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- -1 Arsenic compound arsenic trioxide Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 150000001495 arsenic compounds Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004009 herbicide Substances 0.000 description 1
- 239000002917 insecticide Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/4263—Means for active heating or cooling
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B30/00—Obtaining antimony, arsenic or bismuth
- C22B30/04—Obtaining arsenic
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Abstract
The invention provides an arsenic-containing gas treatment device which comprises a temperature-controllable high-temperature gas-solid separator, a condensation arsenic collecting device, an arsenic collecting cloth bag, a high-temperature closed reduction furnace and a crystallization tank. The temperature-controllable high-temperature gas-solid separator is used for separating dust from arsenic-containing pyrolysis gas and comprises a gas-solid separator inner cylinder for conveying the pyrolysis gas and a gas-solid separator outer cylinder for conveying high-temperature flue gas, and the gas-solid separator inner cylinder is nested in the gas-solid separator outer cylinder. The gas-solid separator inner cylinder comprises an upper purification cavity, a lower ash discharge structure and a plurality of filter membrane tubes which are uniformly arranged in the purification cavity in the longitudinal direction. The condensation arsenic collecting device is used for condensing the pyrolysis gas to form arsenic oxide powder. The arsenic collecting cloth bag is used for collecting arsenic oxide powder. The high-temperature closed reduction furnace is used for reducing arsenic in arsenic oxide powder. The crystallizing tank is used for separating out the reduced simple substance arsenic. The invention also provides equipment for removing arsenic from the high-arsenic metal ore powder, which has obvious energy-saving and emission-reducing effects.
Description
The invention relates to a high-arsenic metal ore powder dearsenifying device with a high-efficiency arsenic-containing gas treatment device, which is a divisional application of the original application, wherein the application date of the original application is 11-month-12-year 2020, and the application number is 202011264067.8.
Technical Field
The invention relates to the field of solid waste treatment, in particular to an arsenic-containing gas treatment device and high-arsenic metal ore powder arsenic removal equipment.
Background
Arsenic and arsenic compounds are used in pesticides, herbicides, insecticides, and many alloys. Arsenic compound arsenic trioxide is called arsenic trioxide, which is a highly toxic substance. Generally, a roasting method can be adopted to carry out pyrolysis gasification on high-arsenic metal ore powder so as to generate pyrolysis gas containing arsenic oxide, thereby achieving the purpose of arsenic removal. In the arsenic removal equipment for high-arsenic metal ore powder in the prior art, a common arsenic-containing gas treatment device is adopted to purify pyrolysis gas containing arsenic oxide, so that the pyrolysis gas resource containing arsenic oxide is not recycled, and the investment scale of the arsenic-containing gas treatment device and the difficulty in waste gas treatment are increased.
Therefore, it is necessary to provide an arsenic-containing gas treatment device and a high-arsenic metal ore powder arsenic removal device to solve the above technical problems.
Disclosure of Invention
The invention provides high-arsenic metal ore powder dearsenification equipment with a high-efficiency arsenic-containing gas treatment device and a method. The device solves the technical problems that in the high-arsenic metal mineral powder arsenic removal equipment in the prior art, the adopted arsenic-containing gas treatment device is used for purifying the pyrolysis gas containing arsenic oxide, the pyrolysis gas resource containing arsenic oxide is not reused, and the investment scale of the arsenic-containing gas treatment device and the waste gas treatment difficulty are increased.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a high arsenic metal ore powder dearsenifying equipment with a high-efficiency arsenic-containing gas treatment device comprises:
the primary preheating furnace is used for preheating the high-arsenic metal ore powder and comprises a preheating furnace inner kiln used for conveying the high-arsenic metal ore powder and a preheating furnace jacket used for conveying high-temperature flue gas; one end of the kiln in the preheating furnace is provided with a preheating furnace feeding hole, and the other end of the kiln in the preheating furnace is provided with a preheating furnace discharging hole; the preheating furnace jacket surrounds the periphery of the outer wall of the inner kiln of the preheating furnace, one end of the preheating furnace jacket is provided with a preheating furnace flue gas inlet, and the other end of the preheating furnace jacket is provided with a preheating furnace flue gas outlet;
the secondary oxygen control roasting furnace is used for heating and pyrolyzing the high-arsenic metal ore powder and comprises a roasting furnace inner kiln used for conveying the high-arsenic metal ore powder and a roasting furnace jacket used for conveying high-temperature flue gas; one end of the kiln in the roasting furnace is provided with a roasting furnace feed inlet connected with the discharge outlet of the preheating furnace, and the other end of the kiln in the roasting furnace is provided with a roasting furnace discharge outlet and a roasting furnace pyrolysis gas outlet; the roasting furnace jacket surrounds the periphery of the outer wall of the kiln in the roasting furnace, a roasting furnace flue gas inlet is formed in one side of the roasting furnace jacket, a roasting furnace flue gas outlet is formed in the other side of the roasting furnace jacket, and the roasting furnace flue gas outlet is connected with the preheating furnace flue gas inlet;
the flue gas main pipe is used for conveying high-temperature flue gas and comprises a main pipe flue gas inlet and a first main pipe flue gas outlet, and the first main pipe flue gas outlet is connected with the roasting furnace flue gas inlet;
the combustion chamber is used for generating high-temperature flue gas and is provided with a combustion chamber flue gas outlet connected with the main pipe flue gas inlet;
the arsenic-containing gas treatment device is used for treating the toxic pyrolysis gas;
the arsenic-containing gas treatment device comprises:
the condensation arsenic collecting device is used for condensing the pyrolysis gas into arsenic oxide powder, and is provided with a condenser pyrolysis gas inlet connected with the roasting furnace pyrolysis gas outlet and a condenser powder outlet used for outputting the arsenic oxide powder;
the arsenic collecting cloth bag is used for collecting arsenic oxide powder and is provided with a cloth bag inlet connected with the condenser powder output port and a cloth bag outlet used for outputting the arsenic oxide powder;
the high-temperature closed reduction furnace is used for reducing arsenic in arsenic oxide powder and comprises a lower reduction furnace for placing the arsenic oxide powder and an upper reduction furnace for placing a reducing agent, the lower reduction furnace is provided with a lower reduction furnace inlet which is connected with the outlet of the cloth bag, and the upper reduction furnace is provided with an upper reduction furnace outlet;
and the crystallizing tank is used for separating out the reduced simple substance arsenic and is provided with a crystallizing tank inlet connected with the outlet of the upper reducing furnace and a crystallizing tank material outlet used for outputting the simple substance arsenic.
In the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device, the flue gas main pipe is also provided with a second main pipe flue gas outlet, the arsenic-containing gas treatment device also comprises a temperature-controllable high-temperature gas-solid separator for separating dust from pyrolysis gas, and the temperature-controllable high-temperature gas-solid separator comprises a gas-solid separator inner cylinder for conveying the pyrolysis gas and a gas-solid separator outer cylinder for conveying the high-temperature flue gas, wherein the gas-solid separator inner cylinder is nested in the gas-solid separator outer cylinder;
the inner cylinder of the gas-solid separator comprises an upper purification cavity, a lower ash discharge structure and a plurality of filtering membrane pipes which are uniformly arranged in the purification cavity in the longitudinal direction; the purification cavity is provided with a pyrolysis gas inlet of a gas-solid separator and a pyrolysis gas outlet of the gas-solid separator, the pyrolysis gas inlet of the gas-solid separator is connected with the pyrolysis gas outlet of the roasting furnace through a main pyrolysis gas pipeline, the main pyrolysis gas pipeline is provided with an electric control valve for shutting and opening pyrolysis gas, the pyrolysis gas outlet of the gas-solid separator is connected with the pyrolysis gas inlet of the condenser, the ash discharge structure is in a conical shape with a wide upper part and a narrow lower part, and the bottom of the ash discharge structure is provided with an ash discharge port for discharging dust;
the outer cylinder of the gas-solid separator is provided with a gas-solid separator flue gas inlet and a gas-solid separator flue gas outlet, the gas-solid separator flue gas inlet is connected with the second main pipe flue gas outlet sequentially through a gas-solid separator external heating flue gas pipeline and a gas-solid separator heating flue gas pipeline, an electric control valve used for adjusting gas flow is arranged on the gas-solid separator external heating flue gas pipeline, and the gas-solid separator flue gas outlet is connected with the flue gas purification device.
In the high-arsenic metal ore powder dearsenifying equipment with the high-efficiency arsenic-containing gas treatment device, an internal preheated flue gas pipeline of the gas-solid separator is also connected between the main pyrolysis gas pipeline and the external heated flue gas pipeline of the gas-solid separator, and an electric control valve for switching off and switching on is arranged on the internal preheated flue gas pipeline.
In the arsenic-containing gas treatment device of the high-arsenic metal mineral powder dearsenification equipment, the arsenic-containing gas treatment device further comprises a smoke indirect heat exchanger for cooling pyrolysis gas and preventing burning out of the arsenic collecting cloth bag, the smoke indirect heat exchanger is provided with a heat exchanger inlet and a heat exchanger outlet, the heat exchanger inlet is connected with the pyrolysis gas outlet of the gas-solid separator, and the heat exchanger outlet is connected with the pyrolysis gas inlet of the condenser.
In the high-arsenic metal ore powder dearsenifying equipment with the high-efficiency arsenic-containing gas treatment device,
the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device also comprises a gas purification device for treating toxic pyrolysis gas, and the condensation arsenic-collecting device is also provided with a condenser pyrolysis gas outlet which is connected with the gas purification device;
the crystallizing tank is also provided with a crystallizing tank gas outlet which is connected with a gas purifying device.
In the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device, the pyrolysis gas outlet of the roasting furnace is connected with a pyrolysis gas bypass pipeline for discharging original gas into air, wherein the pyrolysis gas bypass pipeline is provided with an electric control valve for closing and opening.
In the high-arsenic metal ore powder dearsenifying equipment with the high-efficiency arsenic-containing gas treatment device, the flue gas inlet of the preheating furnace is arranged at one end close to the discharge hole of the preheating furnace, and the flue gas outlet of the roasting furnace is arranged at one end close to the feed hole of the roasting furnace.
In the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device, the number of the roasting furnace flue gas inlets is N (N is more than 1), the flue gas inlets are distributed on the axial side wall of the roasting furnace jacket, the number of the first main pipe flue gas outlets is N, the first main pipe flue gas outlets are distributed on the axial side wall of the flue gas main pipe, and the N first main pipe flue gas outlets are correspondingly connected with the N roasting furnace flue gas inlets through N flue gas channels.
In the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device, flue gas inlets of the roasting furnace are uniformly distributed, flue gas outlets of the first main pipe are uniformly distributed, and N flue gas channels are respectively provided with an electric control valve for regulating gas flow.
In the high-arsenic metal ore powder dearsenifying equipment with the high-efficiency arsenic-containing gas treatment device, the diameter of the flue gas inlet of the roasting furnace is gradually reduced from one end close to the flue gas outlet of the roasting furnace to one end far away from the flue gas outlet of the roasting furnace, and the diameters of the flue gas channel and the flue gas outlet of the first main pipe are matched with the diameter of the flue gas inlet of the roasting furnace.
In the high-arsenic metal ore powder dearsenifying equipment with the high-efficiency arsenic-containing gas treatment device, the distance between the adjacent roasting furnace flue gas inlets is gradually increased from one end close to the roasting furnace flue gas outlet to one end far away from the roasting furnace flue gas outlet.
In the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device, a plurality of first flue partition plates with first flue through holes are axially arranged between two side walls in the preheating furnace jacket, and the two first flue through holes of two adjacent first flue partition plates are oppositely arranged at an angle of 180 degrees.
In the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device, a plurality of second flue clapboards with second flue through holes are axially arranged between two side walls in the preheating furnace jacket, a flue baffle is arranged between the second flue clapboards, and the two second flue through holes of two adjacent second flue clapboards are respectively positioned at two sides of the flue baffle.
In the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device, a roasting furnace flue gas outlet pipe is connected between the roasting furnace flue gas outlet and the preheating furnace flue gas inlet, and an electric control valve for shutting off and opening high-temperature flue gas is arranged on the roasting furnace flue gas outlet pipe.
In the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device, one end of the roasting furnace jacket close to the roasting furnace flue gas outlet pipe and one end of the roasting furnace jacket far away from the roasting furnace flue gas outlet pipe are respectively provided with a temperature probe for monitoring the temperature of high-temperature flue gas.
In the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device, the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device also comprises a flue gas purification device, and a flue gas outlet of the preheating furnace is connected with the flue gas purification device after being connected with a tail gas fan.
In the high-arsenic metal ore powder dearsenifying equipment with the high-efficiency arsenic-containing gas treatment device,
the primary preheating furnace is transversely obliquely arranged and axially rotates, and one end of the primary preheating furnace, which is close to the discharge port of the preheating furnace, is lower than one end of the primary preheating furnace, which is close to the feed port of the preheating furnace;
the two-stage oxygen control roasting furnace is transversely obliquely arranged and axially rotates, and one end of the two-stage oxygen control roasting furnace, which is close to the discharge port of the roasting furnace, is lower than one end of the two-stage oxygen control roasting furnace, which is close to the feed port of the roasting furnace.
A high-arsenic metal ore powder dearsenification method uses high-arsenic metal ore powder dearsenification equipment with a high-efficiency arsenic-containing gas treatment device to perform dearsenification operation, and the high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device comprises a primary preheating furnace, a secondary oxygen control roasting furnace, a flue gas main pipe, a combustion chamber, a flue gas purification device and an arsenic-containing gas treatment device. The primary preheating furnace comprises a preheating furnace inner kiln and a preheating furnace jacket. The inner kiln of the preheating furnace is provided with a preheating furnace feeding hole and a preheating furnace discharging hole. The jacket of the preheating furnace is provided with a preheating furnace flue gas inlet and a preheating furnace flue gas outlet. The two-stage oxygen control roasting furnace comprises a roasting furnace inner kiln and a roasting furnace jacket. The kiln in the roasting furnace is provided with a roasting furnace feed inlet, a roasting furnace discharge outlet and a roasting furnace pyrolysis gas outlet. The flue gas main pipe is provided with a main pipe flue gas inlet and a first main pipe flue gas outlet. The combustion chamber is provided with a combustion chamber flue gas outlet. The arsenic removal method comprises the following steps:
s11: conveying high-arsenic metal ore powder into the kiln in the preheating furnace from the feed inlet of the preheating furnace, preheating the high-arsenic metal ore powder through high-temperature flue gas in a jacket of the preheating furnace, outputting the high-arsenic metal ore powder from the discharge outlet of the preheating furnace, and inputting the high-arsenic metal ore powder into the kiln in the roasting furnace through the feed inlet of the roasting furnace;
s12: the high-arsenic metal mineral powder in the kiln in the roasting furnace is heated and pyrolyzed through high-temperature flue gas in the roasting furnace jacket, and then residues after pyrolysis and gasification are output through a discharging hole of the roasting furnace;
s13: and discharging pyrolysis gas generated after pyrolysis gasification of the high-arsenic metal mineral powder in the kiln in the roasting furnace through a pyrolysis gas outlet of the roasting furnace, and treating waste gas through the arsenic-containing gas treatment device.
Wherein the high-temperature flue gas in the roasting furnace jacket is generated by the following steps:
s14: combustible gas is combusted in the combustion chamber, and generated high-temperature flue gas is output through a flue gas outlet of the combustion chamber and then is input into the flue gas main pipe through a flue gas inlet of the main pipe;
s15: outputting the high-temperature flue gas in the flue gas main pipe through a flue gas outlet of the first main pipe, and inputting the high-temperature flue gas into the roasting furnace jacket through a flue gas inlet of the roasting furnace;
the high-temperature flue gas in the jacket of the preheating furnace is generated by the following steps:
s16: and outputting the high-temperature flue gas in the roasting furnace jacket through the roasting furnace flue gas outlet, and inputting the high-temperature flue gas into the preheating furnace jacket through the preheating furnace flue gas inlet.
In the method for removing arsenic from high-arsenic metal ore powder, high-arsenic metal ore powder arsenic removing equipment with a high-efficiency arsenic-containing gas treatment device is used for removing arsenic, N (N >1) roasting furnace flue gas inlets are uniformly distributed on the axial side wall of a roasting furnace jacket, N first main pipe flue gas outlets are uniformly distributed on the axial side wall of a flue gas main pipe, N first main pipe flue gas outlets are correspondingly connected with N roasting furnace flue gas inlets through N flue gas channels, and the N flue gas channels are respectively provided with an electric control valve for adjusting gas flow.
In the step S15, the high-temperature flue gas in the flue gas main pipe is output through the flue gas outlet of the first main pipe, when the temperature near the flue gas outlet of the roasting furnace is lower than a first set temperature, the electric control valve on the flue gas channel near the flue gas outlet of the roasting furnace is adjusted to increase the gas amount of the high-temperature flue gas, and when the temperature near the flue gas outlet of the roasting furnace is higher than a second set temperature, the second set temperature is higher than the first set temperature, and the electric control valve on the flue gas channel near the flue gas outlet of the roasting furnace is adjusted to decrease the gas amount of the high-temperature flue gas.
In the method for removing arsenic from high-arsenic metal ore powder, high-arsenic metal ore powder arsenic removing equipment with a high-efficiency arsenic-containing gas treatment device is used for removing arsenic, N (N >1) roasting furnace flue gas inlets are uniformly distributed on the axial side wall of a roasting furnace jacket, N first main pipe flue gas outlets are uniformly distributed on the axial side wall of a flue gas main pipe, N first main pipe flue gas outlets are correspondingly connected with N roasting furnace flue gas inlets through N flue gas channels, and the N flue gas channels are respectively provided with an electric control valve for adjusting gas flow.
In step S15, the high-temperature flue gas in the flue gas main pipe is output through the flue gas outlet of the first main pipe, when the temperature far away from the flue gas outlet of the roasting furnace is higher than a second set temperature, the electric control valve on the part of the flue gas channel far away from the flue gas outlet of the roasting furnace is turned off, and when the temperature far away from the flue gas outlet of the roasting furnace is lower than the first set temperature, the electric control valve on the part of the flue gas channel far away from the flue gas outlet of the roasting furnace is turned on again.
In the method for removing arsenic from high-arsenic metal ore powder, high-arsenic metal ore powder arsenic removal equipment with a high-efficiency arsenic-containing gas treatment device is used for arsenic removal operation, a roasting furnace flue gas outlet pipe is connected between a roasting furnace flue gas outlet and a preheating furnace flue gas inlet, and an electric control valve for turning off and turning on high-temperature flue gas is arranged on the roasting furnace flue gas outlet pipe.
Step S11 includes closing the feeding port of the roasting furnace, and simultaneously opening the electric control valve on the flue gas outlet pipe of the roasting furnace, so that the high-temperature flue gas in the roasting furnace jacket is input into the preheating furnace jacket, opening the feeding port of the roasting furnace after a first set time, and simultaneously closing the electric control valve on the flue gas outlet pipe of the roasting furnace, so that the high-temperature flue gas in the roasting furnace jacket is stopped from being input into the preheating furnace jacket, and after a second set time, closing the feeding port of the roasting furnace again, and simultaneously opening the electric control valve on the flue gas outlet pipe of the roasting furnace, so that the high-temperature flue gas in the roasting furnace jacket is input into the preheating furnace jacket again.
In the method for removing arsenic from high-arsenic metal ore powder, arsenic removal operation is performed by using high-arsenic metal ore powder arsenic removal equipment with a high-efficiency arsenic-containing gas treatment device, a pyrolysis gas outlet of the roasting furnace is connected with a pyrolysis gas bypass pipeline, before the step S11, the method further comprises the steps of opening an electric control valve on the pyrolysis gas bypass pipeline, evacuating the residual pyrolysis gas in a jacket of the roasting furnace, and closing the electric control valve on the pyrolysis gas bypass pipeline after the set time is reached.
In the method for removing arsenic from high-arsenic metal ore powder, arsenic removal operation is carried out by using high-arsenic metal ore powder arsenic removal equipment with a high-efficiency arsenic-containing gas treatment device, wherein the arsenic-containing gas treatment device comprises a condensation arsenic-collecting device, an arsenic-collecting cloth bag, a high-temperature closed reduction furnace, a crystallization tank and a gas purification device. The condensation arsenic collecting device is provided with a condenser pyrolysis gas inlet, a condenser pyrolysis gas outlet and a condenser powder outlet. The arsenic collecting cloth bag is provided with a cloth bag inlet and a cloth bag outlet. The high-temperature closed reduction furnace comprises a lower reduction furnace and an upper reduction furnace. The lower reducing furnace is provided with a lower reducing furnace inlet, and the upper reducing furnace is provided with an upper reducing furnace outlet. The crystallizer is provided with a crystallizer inlet, a crystallizer material outlet and a crystallizer gas outlet. In step S13, the exhaust gas treatment specifically includes the steps of:
s21: pyrolysis gas output from a pyrolysis gas outlet of the roasting furnace is input into the condensation arsenic collecting device through a pyrolysis gas inlet of the condenser, the condensation arsenic collecting device carries out condensation treatment on the pyrolysis gas, and arsenic oxide powder formed by condensation is output through a powder output port of the condenser and then input into the arsenic collecting cloth bag through a cloth bag inlet;
s22: the arsenic collecting cloth bag collects arsenic oxide powder, the arsenic oxide powder is output through the cloth bag outlet after reaching a set amount and is input into the lower reducing furnace through the lower reducing furnace inlet, and the arsenic oxide powder is volatilized under a high-temperature closed condition;
s23: placing a carbon reducing agent in the upper reducing furnace, reducing the volatilized arsenic oxide in the lower reducing furnace by adopting a carbon reducing method to generate arsenic gas, outputting the generated arsenic gas through an outlet of the upper reducing furnace, and inputting the generated arsenic gas into the crystallizing tank through an inlet of the crystallizing tank;
s24: the crystallizing tank separates out arsenic gas to form simple substance arsenic, and the simple substance arsenic is output through a material outlet of the crystallizing tank.
In the method for removing arsenic from high-arsenic metal ore powder, the arsenic removal operation is carried out by using high-arsenic metal ore powder arsenic removal equipment with a high-efficiency arsenic-containing gas treatment device, the flue gas main pipe is also provided with a second main pipe flue gas outlet, and the arsenic-containing gas treatment device also comprises a temperature-controllable high-temperature gas-solid separator. The temperature-controllable high-temperature gas-solid separator comprises an inner cylinder of the gas-solid separator and an outer cylinder of the gas-solid separator. The gas-solid separator inner cylinder comprises a purification cavity at the upper part, an ash discharge structure at the lower part and a plurality of filtering membrane pipes. The ash discharging structure is provided with an ash discharging opening. The purification cavity is provided with a pyrolysis gas inlet of a gas-solid separator and a pyrolysis gas outlet of the gas-solid separator. The outer cylinder of the gas-solid separator is provided with a gas-solid separator flue gas inlet and a gas-solid separator flue gas outlet. The high-arsenic metal ore powder dearsenification equipment with the high-efficiency arsenic-containing gas treatment device also comprises a main pyrolysis gas pipeline, a flue gas heating pipeline outside the gas-solid separator and a flue gas heating pipeline of the gas-solid separator.
The step S21 is preceded by the steps of:
s31: opening electric control valves on the main pyrolysis gas pipeline and a heating flue gas pipeline outside the gas-solid separator;
s32: conveying the pyrolysis gas discharged from the pyrolysis gas outlet of the roasting furnace in the step S13 through the main pyrolysis gas pipeline, inputting the pyrolysis gas into the purification cavity through a pyrolysis gas inlet of the gas-solid separator, filtering dust through the filtering membrane pipe, outputting the filtered pyrolysis gas through a pyrolysis gas outlet of the gas-solid separator, inputting the filtered pyrolysis gas into the arsenic condensation and collection device through a pyrolysis gas inlet of the condenser, and discharging the filtered dust through the dust discharging port;
s33: outputting the high-temperature flue gas of the flue gas main pipe in the step S14 through a flue gas outlet of the second main pipe, sequentially conveying the high-temperature flue gas through a heating flue gas pipeline of the gas-solid separator and a heating flue gas pipeline outside the gas-solid separator, and inputting the high-temperature flue gas into an outer barrel of the gas-solid separator through a flue gas inlet of the gas-solid separator to heat pyrolysis gas in an inner barrel of the gas-solid separator.
In the method for removing arsenic from high-arsenic metal ore powder, high-arsenic metal ore powder arsenic removing equipment with a high-efficiency arsenic-containing gas treatment device is used for performing arsenic removal operation, a preheating flue gas pipeline inside a gas-solid separator is further arranged between a main pyrolysis gas pipeline and a heating flue gas pipeline outside the gas-solid separator, an electric control valve is arranged on the preheating flue gas pipeline, and before the step S31, the method for removing arsenic further comprises the following steps:
s41: turning off an electric control valve on the main pyrolysis gas pipeline, and opening an electric control valve on a preheated flue gas pipeline inside the gas-solid separator;
s42: and in the step S14, after the high-temperature flue gas of the flue gas main pipe is output through the flue gas outlet of the second main pipe, the high-temperature flue gas is sequentially conveyed through the heating flue gas pipeline of the gas-solid separator and the preheating flue gas pipeline inside the gas-solid separator, and then the high-temperature flue gas is input into the inner cylinder of the gas-solid separator through the pyrolysis gas inlet of the gas-solid separator to preheat the inner cylinder of the gas-solid separator.
In the method for removing arsenic from high-arsenic metal ore powder, the high-arsenic metal ore powder arsenic removing equipment is used for arsenic removal operation, the arsenic-containing gas treatment device further comprises a smoke indirect heat exchanger, the smoke indirect heat exchanger is provided with a heat exchanger inlet and a heat exchanger outlet, in the step S32, pyrolysis gas is output from a pyrolysis gas outlet of the gas-solid separator, then enters the smoke indirect heat exchanger through the heat exchanger inlet for cooling operation, the cooled pyrolysis gas is output through the heat exchanger outlet and then is input into the condensation arsenic collecting device through the condenser pyrolysis gas inlet, and the condensation arsenic collecting device is used for preventing the arsenic collecting cloth bag from being burnt out due to high temperature.
Compared with the prior art, the invention has the beneficial effects that: the arsenic-containing gas treatment device is formed by sequentially connecting a temperature-controllable high-temperature gas-solid separator, a smoke indirect heat exchanger, a condensation arsenic-collecting device, an arsenic-collecting cloth bag, a high-temperature closed reduction furnace and a crystallization tank, so that the elemental arsenic is obtained after the pyrolysis gas containing arsenic oxide is treated. The pyrolysis gas resource containing arsenic oxide is recycled, the investment scale of the arsenic-containing gas treatment device and the difficulty of waste gas treatment are greatly reduced, and the effects of energy conservation and emission reduction are remarkable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments are briefly introduced below, and the drawings in the following description are only corresponding to some embodiments of the present invention.
FIG. 1 is a schematic structural diagram of the apparatus for removing arsenic from high-arsenic metal ore powder according to the present invention.
FIG. 2 is a schematic plan view showing the inner structure of a jacket of a preheating furnace according to a first embodiment of the present invention after being expanded along the axis.
FIG. 3 is a schematic plan view showing the inner structure of a jacket of a second preheating furnace according to the present invention after being expanded along the axis.
FIG. 4 is a partial flow chart of the dearsenifying method of the high arsenic metal ore powder of the present invention.
FIG. 5 is another part of the flow chart of the dearsenification method of high arsenic metal ore powder of the present invention.
Wherein the content of the first and second substances,
1. a preheating furnace feeding device 1-1, a preheating furnace feeding funnel 1-2 and a preheating furnace feeding screw;
2. 2-1 parts of a primary preheating furnace, 2-1 parts of a preheating furnace inner kiln, 2-1 parts of a preheating furnace inlet, 2-1 parts of a preheating furnace outlet, 2-2 parts of a preheating furnace jacket, 2-2 parts of a preheating furnace flue gas inlet, 2-2 parts of a preheating furnace flue gas outlet, 2-2 parts of a first flue partition plate, 2-2-3a parts of a first flue through hole, 2-2-4 parts of a second flue partition plate, 2-2-4a parts of a second flue through hole, 2-2-5 parts of a flue baffle plate;
3. a two-stage oxygen-controlled roasting furnace, 3-1, a roasting furnace inner kiln, 3-1-1, a roasting furnace feed inlet, 3-1-2, a roasting furnace discharge outlet, 3-1-3, a roasting furnace pyrolysis gas outlet, 3-2, a roasting furnace jacket, 3-2-1, a roasting furnace flue gas inlet, 3-2-2 and a roasting furnace flue gas outlet;
4. a flue gas purification device;
5. a preheating furnace tail gas main pipeline;
6. feeding screws of the roasting furnace;
7. a flue gas channel;
8. 8-1 of a main flue gas pipe, 8-2 of a main flue gas inlet, 8-3 of a first main flue gas outlet and a second main flue gas outlet;
9. a combustion chamber 9-1 and a combustion chamber flue gas outlet;
10. a combustion engine;
11. a tail gas fan;
12. the device comprises a temperature-controllable high-temperature gas-solid separator, 12-1, an inner cylinder of the gas-solid separator, 12-1-1, a purification cavity, 12-1-2, an ash discharge structure, 12-1-3, a filtering membrane tube, 12-1-4, a pyrolysis gas inlet of the gas-solid separator, 12-1-5, a pyrolysis gas outlet of the gas-solid separator, 12-1-6, an ash discharge port, 12-2, an outer cylinder of the gas-solid separator, 12-2-1, a flue gas inlet of the gas-solid separator, 12-2-2 and a flue gas outlet of the gas-solid separator;
13. the device comprises a condensation arsenic collecting device 13-1, a condenser pyrolysis gas inlet 13-2, a condenser pyrolysis gas outlet 13-3 and a condenser powder outlet;
14. a high-temperature closed reduction furnace, 14-1, a lower reduction furnace, 14-1-1, an inlet of the lower reduction furnace, 14-2, an upper reduction furnace, 14-2-1 and an outlet of the upper reduction furnace;
15. 15-1 parts of a crystallizing tank, 15-2 parts of an inlet of the crystallizing tank, 15-3 parts of a material outlet of the crystallizing tank and a gas outlet of the crystallizing tank;
16. a gas purification device;
17. a high temperature flue gas duct;
18. preheating a furnace tail gas bypass pipeline;
19. the gas-solid separator heats the flue gas pipeline;
20. collecting an arsenic cloth bag;
21-1, a main pyrolysis gas pipeline;
21-2, a pyrolysis gas bypass pipeline;
22-1, preheating a flue gas pipeline inside the gas-solid separator;
22-2, heating a flue gas pipeline outside the gas-solid separator;
23. discharging spiral of the roasting furnace;
24. a flue gas outlet pipe of the roasting furnace;
25. a smoke indirect heat exchanger.
In the drawings, elements having similar structures are denoted by the same reference numerals.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, directional terms such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom" are used only with reference to the orientation of the drawings, and the directional terms are used for illustration and understanding of the present invention, and are not intended to limit the present invention.
The terms "first," "second," and the like in the terms of the invention are used for descriptive purposes only and not for purposes of indication or implication relative importance, nor as a limitation on the order of precedence.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the prior art, the conventional roasting method is adopted to carry out pyrolysis gasification dearsenification on high-arsenic metal ore powder, the pyrolysis gasification is insufficient, the dearsenification efficiency is low, and the treated metal ore powder still contains a large amount of arsenic, so that the subsequent further processing treatment on the metal ore powder is not utilized.
The following is a preferred embodiment of an apparatus and method for dearsenifying high arsenic metal ore powder according to the present invention to solve the above technical problems.
Referring to fig. 1, the present invention provides a high-arsenic metal ore powder dearsenifying apparatus with a high-efficiency arsenic-containing gas treatment device, which comprises a primary preheating furnace 2, a secondary oxygen control roasting furnace 3, a flue gas main pipe 8, a combustion chamber 9, a flue gas purification device 4, and an arsenic-containing gas treatment device.
The primary preheating furnace 2 is used for preheating high-arsenic metal ore powder and comprises a preheating furnace inner kiln 2-1 used for conveying the high-arsenic metal ore powder, a preheating furnace jacket 2-2 used for conveying high-temperature flue gas and a preheating furnace feeding device 1.
The preheating furnace inner kiln 2-1 can be specifically designed into a cylindrical structure, one end of the preheating furnace inner kiln is provided with a preheating furnace inlet 2-1-1, and the other end of the preheating furnace inner kiln is provided with a preheating furnace outlet 2-1-2. The kiln 2-1 in the preheating furnace is transversely obliquely arranged, and one end of the kiln, which is close to the discharge port 2-1-2 of the preheating furnace, is lower than one end of the kiln, which is close to the feed port 2-1-1 of the preheating furnace, so that high-arsenic metal ore powder can be conveyed from the feed port 2-1-1 of the preheating furnace to the discharge port 2-1-2 of the preheating furnace along with the current situation, and the structure is simple and effective. And the kiln 2-1 in the preheating furnace rotates along the axial direction, so that the high-arsenic metal ore powder can be heated uniformly, and the pyrolysis gasification dearsenification effect is improved.
The preheating furnace feeding device 1 comprises a preheating furnace feeding funnel 1-1 used for feeding high-arsenic metal ore powder and a preheating furnace feeding screw 1-2 used for pushing the high-arsenic metal ore powder, one end of the preheating furnace feeding screw 1-2 is connected with the preheating furnace feeding funnel 1-1, and the other end of the preheating furnace feeding screw is connected with the preheating furnace feeding funnel 2-1-1. The feeding hopper 1-1 of the preheating furnace and the feeding screw 1-2 of the preheating furnace are matched for feeding, so that the high-arsenic metal mineral powder can be uniformly fed, and the pyrolysis gasification dearsenification effect is improved.
The preheating furnace jacket 2-2 can be specifically designed into an annular cylindrical structure, surrounds the outer wall of the kiln 2-1 in the preheating furnace, and is provided with a preheating furnace flue gas inlet 2-2-1 at one end close to a preheating furnace discharge port 2-1-2 and a preheating furnace flue gas outlet 2-2-2 at the other end. The flue gas inlet 2-2-1 of the preheating furnace is arranged at one end close to the discharge port 2-1-2 of the preheating furnace, so that the temperature of the high-arsenic metal mineral powder in the kiln 2-1 in the preheating furnace can reach the highest value during discharging, the temperature is closer to the temperature required by pyrolysis and gasification, and the overall pyrolysis and gasification effect is improved. The preheating furnace flue gas outlet 2-2-2 is connected with the tail gas fan 11 and then connected with the flue gas purification device 4, and high-temperature flue gas is discharged after being purified, so that the method is more environment-friendly.
The secondary oxygen control roasting furnace 3 is used for heating, pyrolyzing and dearsenifying high-arsenic metal ore powder and comprises a roasting furnace inner kiln 3-1 for conveying the high-arsenic metal ore powder, a roasting furnace jacket 3-2 for conveying high-temperature flue gas, a roasting furnace feeding screw 6 and a roasting furnace discharging screw 23.
The kiln 3-1 in the roasting furnace can be specifically designed into a cylindrical structure, one end of the kiln is provided with a roasting furnace feed inlet 3-1-1 connected with a preheating furnace discharge outlet 2-1-2, and the other end of the kiln is provided with a roasting furnace discharge outlet 3-1-2 and a roasting furnace pyrolysis gas outlet 3-1-3. The kiln 3-1 in the roasting furnace is transversely obliquely arranged, and one end of the kiln, which is close to the discharge port 3-1-2 of the roasting furnace, is lower than one end of the kiln, which is close to the feed port 3-1-1 of the roasting furnace, so that high-arsenic metal ore powder can be conveyed from the feed port 3-1-1 of the roasting furnace to the discharge port 3-1-2 of the roasting furnace, and the kiln has a simple structure and an obvious effect. And the kiln 3-1 in the roasting furnace rotates along the axial direction, so that the high-arsenic metal ore powder can be uniformly heated, and the pyrolysis gasification dearsenification effect is improved.
One end of a roasting furnace feeding screw 6 is connected with a roasting furnace feeding port 3-1-1, the other end of the roasting furnace feeding screw is connected with a preheating furnace discharging port 2-1-2, and a roasting furnace discharging screw 23 is connected with a roasting furnace discharging port 3-1-2. By arranging the feeding screw 6 of the roasting furnace and the discharging screw 23 of the roasting furnace, high-arsenic metal ore powder can be uniformly input and output, so that the pyrolysis gasification dearsenification effect is improved.
The roasting furnace jacket 3-2 can be specifically designed into an annular cylindrical structure and surrounds the periphery of the outer wall of the roasting furnace 3-1, a roasting furnace flue gas inlet 3-2-1 is formed in one side of the roasting furnace jacket, a roasting furnace flue gas outlet 3-2-2 is formed in the other side of the roasting furnace jacket, and the roasting furnace flue gas outlet 3-2-2 is connected with a preheating furnace flue gas inlet 2-2-1. The roasting furnace flue gas outlet 3-2-2 can be specifically arranged at one end close to the feeding port 3-1-1 of the roasting furnace, and the temperature close to the roasting furnace flue gas outlet 3-2-2 is generally not stable, so that the temperature of high-temperature flue gas in the subsequent stage can be ensured to be stable, and the pyrolysis gasification dearsenification effect of the high-arsenic metal mineral powder is improved.
The flue gas main pipe 8 is used for conveying high-temperature flue gas and is provided with a main pipe flue gas inlet 8-1 and a first main pipe flue gas outlet 8-2. The first main pipe flue gas outlet 8-2 is connected with the roasting furnace flue gas inlet 3-2-1. The combustion chamber 9 is used for generating high-temperature flue gas, one end of the combustion chamber 9 is connected with a combustor 10, the other end of the combustion chamber 9 is provided with a combustion chamber flue gas outlet 9-1, and the combustion chamber flue gas outlet 9-1 is connected with a main pipe flue gas inlet 8-1. The arsenic-containing gas treatment device is used for treating toxic pyrolysis gas and is connected with the outlet 3-1-3 of the pyrolysis gas of the roasting furnace.
The working principle of the device is that firstly combustible gas and air are mixed by a combustor 10 and then are combusted in a combustion chamber 9, and the generated high-temperature flue gas is output through a flue gas outlet 9-1 of the combustion chamber and then is input into a flue gas main pipe 8 through a flue gas inlet 8-1 of the main pipe. High-temperature flue gas in the flue gas main pipe 8 is output through a first main pipe flue gas outlet 8-2 and then is input into a roasting furnace jacket 3-2 through a roasting furnace flue gas inlet 3-2-1. High-temperature flue gas in the roasting furnace jacket 3-2 is output through a roasting furnace flue gas outlet 3-2-2 and then input into a preheating furnace jacket 2-2 through a preheating furnace flue gas inlet 2-2-1.
Then adding the high-arsenic metal ore powder into a feed hopper 1-1 of the preheating furnace, uniformly conveying the high-arsenic metal ore powder through a feed screw 1-2 of the preheating furnace, and conveying the high-arsenic metal ore powder into a kiln 2-1 in the preheating furnace through a feed port 2-1-1 of the preheating furnace. The high-arsenic metal ore powder is preheated by high-temperature flue gas in a preheating furnace jacket 2-2, the preheated high-arsenic metal ore powder is output from a discharge port 2-1-2 of the preheating furnace, is uniformly conveyed by a feeding screw 6 of a roasting furnace, and is input into a kiln 3-1 in the roasting furnace through a feeding port 3-1-1 of the roasting furnace. The high-arsenic metal ore powder in the kiln 3-1 in the roasting furnace is heated and pyrolyzed by high-temperature flue gas in the roasting furnace jacket 3-2, so that the high-arsenic metal ore powder is fully pyrolyzed and gasified and then arsenic is removed, and then residues after pyrolysis and gasification are uniformly output through the roasting furnace discharge port 3-1-2 and the roasting furnace discharge spiral 23. Pyrolysis gas containing arsenic oxide generated after pyrolysis and gasification of high-arsenic metal ore powder in a kiln 3-1 in a roasting furnace is discharged through a roasting furnace pyrolysis gas outlet 3-1-3, and waste gas treatment is carried out through an arsenic-containing gas treatment device.
The primary preheating furnace 2 preheats the high-arsenic metal ore powder, the secondary oxygen control roasting furnace 3 heats and pyrolyzes the high-arsenic metal ore powder, the high-arsenic metal ore powder can be quickly heated in the roasting furnace 3-1, the temperature required by pyrolysis and gasification is quickly reached, the pyrolysis and gasification of the high-arsenic metal ore powder are more sufficient, the arsenic removal efficiency is higher, and the arsenic content in the treated high-arsenic metal ore powder is effectively reduced. Meanwhile, high-temperature flue gas generated by the combustion chamber 9 is firstly conveyed to the secondary oxygen control roasting furnace 3 through the flue gas main pipe 8 and then conveyed to the primary preheating furnace 2 through the secondary oxygen control roasting furnace 3, so that the utilization rate of the high-temperature flue gas is improved, and energy is effectively saved.
The high-arsenic metal ore powder can be pyrolyzed and gasified only when reaching a certain temperature, and in order to monitor the temperature of high-temperature flue gas in the roasting furnace jacket 3-2 in real time, temperature probes (not shown) are arranged at one end of the roasting furnace jacket 3-2 close to the roasting furnace flue gas outlet pipe 24 and at one end of the roasting furnace jacket far away from the roasting furnace flue gas outlet pipe 24.
The flue gas main pipe 8 and the secondary oxygen control roasting furnace 3 can adopt various connection modes.
Referring to fig. 1 again, the first connection mode of the flue gas main pipe 8 and the secondary oxygen-controlling roasting furnace 3 is that N (N >1) flue gas inlets 3-2-1 of the roasting furnace are uniformly distributed on the axial side wall of the roasting furnace jacket 3-2, N flue gas outlets 8-2 of the first main pipe are uniformly distributed on the axial side wall of the flue gas main pipe 8, N flue gas outlets 8-2 of the first main pipe are connected with N roasting furnace flue gas inlets 3-2-1 through N flue gas channels 7 in a one-to-one correspondence manner, and N flue gas channels 7 are respectively provided with an electric control valve for adjusting the gas flow.
The connection mode can ensure that the heat of high-temperature flue gas in the roasting furnace jacket 3-2 is uniformly distributed, thereby leading the pyrolysis and gasification of high-arsenic metal mineral powder to be more sufficient. Because the temperature of the high-temperature flue gas close to the flue gas outlet 3-2-2 of the roasting furnace is relatively unstable, the air inflow close to the flue gas outlet 3-2-2 of the roasting furnace can be adjusted by adjusting an electric control valve on the flue gas channel 7.
The second connection mode of the flue gas main pipe 8 and the secondary oxygen control roasting furnace 3 is that the number of the roasting furnace flue gas inlets 3-2-1 is N (N is more than 1), the N flue gas inlets are uniformly distributed on the axial side wall of the roasting furnace jacket 3-2, the number of the first main pipe flue gas outlets 8-2 is N, the N first main pipe flue gas outlets 8-2 are uniformly distributed on the axial side wall of the flue gas main pipe 8, and the N first main pipe flue gas outlets 8-2 are correspondingly connected with the N roasting furnace flue gas inlets 3-2-1 one by one through N flue gas channels 7. The diameter of the roasting furnace flue gas inlet 3-2-1 is gradually reduced from one end close to the roasting furnace flue gas outlet 3-2-2 to one end far away from the roasting furnace flue gas outlet 3-2-2, and the diameters of the flue gas channel 7 and the first main pipe flue gas outlet 8-2 are matched with the diameter of the roasting furnace flue gas inlet 3-2-1.
The connection mode ensures that the air input close to one end of the roasting furnace flue gas outlet 3-2-2 is larger than the air input far away from one end of the roasting furnace flue gas outlet 3-2-2, and the heat lost at the roasting furnace flue gas outlet 3-2-2 can be balanced.
The third connection mode of the flue gas main pipe 8 and the secondary oxygen control roasting furnace 3 is that N (N is more than 1) flue gas inlets 3-2-1 of the roasting furnace are distributed on the axial side wall of the roasting furnace jacket 3-2, N flue gas outlets 8-2 of the first main pipe are distributed on the axial side wall of the flue gas main pipe 8, and the N flue gas outlets 8-2 of the first main pipe are correspondingly connected with the N roasting furnace flue gas inlets 3-2-1 through N flue gas channels 7. The distance between the adjacent roasting furnace flue gas inlets 3-2-1 is gradually increased from one end close to the roasting furnace flue gas outlet 3-2-2 to one end far away from the roasting furnace flue gas outlet 3-2-2.
The connection mode can also ensure that the air input close to one end of the roasting furnace smoke outlet 3-2-2 is larger than the air input far away from one end of the roasting furnace smoke outlet 3-2-2, and the heat lost at the roasting furnace smoke outlet 3-2-2 can be balanced.
In order to ensure that the high-temperature flue gas of the preheating furnace jacket 2-2 can be uniformly conveyed and the heat at each position of the preheating furnace jacket 2-2 is uniform, thereby improving the preheating effect, the internal structure of the preheating furnace jacket 2-2 can adopt two modes.
Fig. 2 is a schematic top view of a first preheating furnace jacket along an axis after being spread and flattened. A plurality of first flue partition boards 2-2-3 with first flue through holes 2-2-3a are axially arranged between two side walls in the preheating furnace jacket 2-2, and two first flue through holes 2-2-3a of two adjacent first flue partition boards 2-2-3 are oppositely arranged at 180 degrees. In fig. 2 is indicated one of the first flue baffles 2-2-3 and its corresponding first flue through hole 2-2-3a, the others not being identified one by one.
After entering a preheating furnace jacket 2-2 from a preheating furnace flue gas inlet 2-2-1, the high-temperature flue gas flows from a first flue through hole 2-2-3a on a first flue partition plate 2-2-3 to a direction close to a preheating furnace flue gas outlet 2-2-2, and is blocked by a second first flue partition plate 2-2-3, the high-temperature flue gas is divided into two paths with opposite directions and flows to a first flue through hole 2-2-3a on a second first flue partition plate 2-2-3, flows 180 degrees respectively and then flows out from the first flue through hole 2-2-3a, and continues to flow to the direction close to the preheating furnace flue gas outlet 2-2-2. The high-temperature flue gas flows repeatedly according to the rule, so that the high-temperature flue gas passes through all the positions of the preheating furnace jacket 2-2, and the heat distribution is uniform.
Fig. 3 is a schematic top view of a second preheating furnace jacket along an axis. A plurality of second flue baffles 2-2-4 with second flue through holes 2-2-4a are axially arranged between two side walls in the preheating furnace jacket 2-2, flue baffles 2-2-5 are arranged between the second flue baffles 2-2-4, and two second flue through holes 2-2-4a of two adjacent second flue baffles 2-2-4 are respectively positioned at two sides of the flue baffles 2-2-5. In fig. 3 is indicated one of the second flue baffles 2-2-4 and its corresponding second flue passage opening 2-2-4a, the others not being identified one by one.
After entering a preheating furnace jacket 2-2 from a preheating furnace flue gas inlet 2-2-1, the high-temperature flue gas flows from a second flue through hole 2-2-4a on a first second flue partition plate 2-2-4 to the direction close to a preheating furnace flue gas outlet 2-2-2, and flows to the direction far away from the flue partition plate 2-2-5 due to the blockage of the second flue partition plate 2-2-4 and the flue partition plate 2-2-5, and flows out from a second flue through hole 2-2-4a on a second flue partition plate 2-2-4 after flowing for 360 degrees, and flows repeatedly according to the rule, so that the high-temperature flue gas passes through all positions of the preheating furnace jacket 2-2, and the heat distribution is uniform.
Referring to fig. 1, a flue gas outlet pipe 24 of the roasting furnace is specifically connected between the flue gas outlet 3-2-2 of the roasting furnace and the flue gas inlet 2-2-1 of the preheating furnace, and an electric control valve for turning off and turning on high-temperature flue gas is arranged on the flue gas outlet pipe 24 of the roasting furnace. When the preheating furnace inner kiln 2-1 adopts the working mode of discontinuously and intensively conveying the high-arsenic metal mineral powder to the roasting furnace inner kiln 3-1, before the high-arsenic metal mineral powder is conveyed to the roasting furnace inner kiln 3-1, the electric control valve on the roasting furnace flue gas outlet pipe 24 can be firstly turned off, so that the heat of high-temperature flue gas in the roasting furnace inner kiln 3-1 is stable, and the pyrolysis gasification effect of the high-arsenic metal mineral powder in the roasting furnace inner kiln 3-1 is ensured. And after pyrolysis and gasification of the high-arsenic metal mineral powder in the kiln 3-1 in the roasting furnace are completed, opening the electric control valve on the flue gas outlet pipe 24 of the roasting furnace again.
Referring to fig. 1, a preheating furnace tail gas main pipeline 5 is connected between the tail gas fan 11 and the flue gas purification device 4, a high-temperature flue gas pipeline 17 is connected between the combustion chamber flue gas outlet 9-1 and the main pipeline flue gas inlet 8-1, and a preheating furnace tail gas bypass pipeline 18 is also connected between the preheating furnace tail gas main pipeline 5 and the high-temperature flue gas pipeline 17. The high-temperature flue gas combined by the high-temperature flue gas pipeline 17 and the preheating furnace tail gas bypass pipeline 18 is input into the flue gas main pipe 8 through the flue gas inlet 8-1 of the main pipe. The high-temperature flue gas pipeline 17 and the preheating furnace tail gas bypass pipeline 18 are both provided with electric control valves for regulating gas flow. The structure can effectively utilize the high-temperature flue gas discharged by the preheating furnace jacket 2-2, and achieves the effects of energy conservation and emission reduction.
With reference to fig. 1, the flue gas main pipe 8 is further provided with a second main pipe flue gas outlet 8-3. The arsenic-containing gas treatment device specifically comprises a temperature-controllable high-temperature gas-solid separator 12, a smoke indirect heat exchanger 25, a condensation arsenic-collecting device 13, an arsenic-collecting cloth bag 20, a high-temperature closed reduction furnace 14, a crystallization tank 15 and a gas purification device 16.
The temperature-controllable high-temperature gas-solid separator 12 is used for separating dust from pyrolysis gas and comprises a gas-solid separator inner cylinder 12-1 for conveying pyrolysis gas and a gas-solid separator outer cylinder 12-2 for conveying high-temperature flue gas, wherein the gas-solid separator inner cylinder 12-1 is nested in the gas-solid separator outer cylinder 12-2.
The gas-solid separator inner cylinder 12-1 comprises an upper purification cavity 12-1-1, a lower ash discharge structure 12-1-2 and a plurality of filtering membrane tubes 12-1-3 which are longitudinally and uniformly arranged in the purification cavity 12-1-1, wherein the filtering membrane tubes 12-1-3 are used for filtering dust in pyrolysis gas. The purification cavity 12-1-1 is provided with a pyrolysis gas inlet 12-1-4 of a gas-solid separator and a pyrolysis gas outlet 12-1-5 of the gas-solid separator. The pyrolysis gas inlet 12-1-4 of the gas-solid separator is connected with the pyrolysis gas outlet 3-1-3 of the roasting furnace through a main pyrolysis gas pipeline 21-1, and the main pyrolysis gas pipeline 21-1 is provided with an electric control valve for shutting off and opening pyrolysis gas. The ash discharging structure 12-1-2 is in a conical shape with a wide upper part and a narrow lower part, and the bottom of the ash discharging structure is provided with an ash discharging port 12-1-6 for discharging dust. The filtering membrane tube (12-1-3) is a metal membrane or a high-temperature ceramic membrane or a high-temperature-resistant, corrosion-resistant and high-precision intermetallic compound filtering membrane, and can work at 550 ℃.
The outer cylinder 12-2 of the gas-solid separator is provided with a gas-solid separator flue gas inlet 12-2-1 and a gas-solid separator flue gas outlet 12-2-2. The gas-solid separator flue gas inlet 12-2-1 is sequentially connected with the second main pipe flue gas outlet 8-3 through a gas-solid separator external heating flue gas pipeline 22-2 and a gas-solid separator heating flue gas pipeline 19, and an electric control valve for adjusting the gas flow is arranged on the gas-solid separator external heating flue gas pipeline 22-2, so that the high-temperature flue gas in the gas-solid separator outer barrel 12-2 can be conveniently controlled to be maintained at a set temperature. The high-temperature flue gas in the outer cylinder 12-2 of the gas-solid separator continuously heats the pyrolysis gas in the inner cylinder 12-1 of the gas-solid separator, so that the filtering effect is better, and for example, arsenic oxide in the pyrolysis gas can be prevented from being changed into powder after being cooled and filtered. Arsenic oxide is a toxic substance and mixed with dust, which increases the difficulty of subsequent treatment. The flue gas outlet 12-2-2 of the gas-solid separator is connected with the flue gas purification device 4, so that the effect of environmental protection is achieved.
An internal preheating flue gas pipeline 22-1 of the gas-solid separator is also connected between the main pyrolysis gas pipeline 21-1 and the external heating flue gas pipeline 22-2 of the gas-solid separator, and an electric control valve for switching off and switching on is arranged on the internal preheating flue gas pipeline 22-1. The structure can firstly not feed pyrolysis gas into the inner cylinder 12-1 of the gas-solid separator, open the electric control valve on the internal preheating flue gas pipeline 22-1, and preheat the inner cylinder 12-1 of the gas-solid separator, so as to improve the stability of the system operation, for example, prevent pyrolysis gas in the initial stage from being suddenly cooled to generate arsenic oxide powder which is filtered together with dust and then discharged. Arsenic oxide is a toxic substance and mixed with dust, which increases the difficulty of subsequent treatment.
The indirect smoke heat exchanger 25 is used for cooling the pyrolysis gas and preventing the arsenic collecting cloth bag 20 from being burnt out, and is provided with a heat exchanger inlet and a heat exchanger outlet, and the heat exchanger inlet is connected with the pyrolysis gas outlet 12-1-5 of the gas-solid separator.
The condensation arsenic collecting device 13 is used for condensing the pyrolysis gas to form arsenic oxide powder, and is provided with a condenser pyrolysis gas inlet 13-1, a condenser pyrolysis gas outlet 13-2 and a condenser powder outlet 13-3. The condenser pyrolysis gas inlet 13-1 is connected with the heat exchanger outlet, and the condenser pyrolysis gas outlet 13-2 is connected with the gas purification device 16 so as to treat the discharged toxic pyrolysis gas. And the condenser powder output port 13-3 is used for outputting arsenic oxide powder.
The arsenic collecting cloth bag 20 is used for collecting arsenic oxide powder and is provided with a cloth bag inlet connected with the condenser powder outlet 13-3 and a cloth bag outlet for outputting arsenic oxide powder.
The high-temperature closed reduction furnace 14 is used for reducing arsenic in arsenic oxide powder and comprises a lower reduction furnace 14-1 for placing the arsenic oxide powder and an upper reduction furnace 14-2 for placing a reducing agent, the lower reduction furnace 14-1 is provided with a lower reduction furnace inlet 14-1-1 which is connected with a cloth bag outlet, and the upper reduction furnace 14-2 is provided with an upper reduction furnace outlet 14-2-1.
The crystallizing tank 15 is used for separating out reduced simple substance arsenic and is provided with a crystallizing tank inlet 15-1 connected with an upper reducing furnace outlet 14-2-1, a crystallizing tank material outlet 15-2 used for outputting the simple substance arsenic and a crystallizing tank gas outlet 15-3 connected with a gas purifying device 16.
It should be noted that the temperature-controllable high-temperature gas-solid separator 12 can improve the precision of arsenic powder oxidation in the subsequent steps, and further improve the system work efficiency, but the temperature-controllable high-temperature gas-solid separator 12 can be omitted according to actual needs, that is, the pyrolysis gas discharged from the pyrolysis gas outlet 3-1-3 of the roasting furnace is directly input into the condensation arsenic collecting device 13 through the pyrolysis gas inlet 13-1 of the condenser.
It should be noted that the temperature of the pyrolysis gas from the outlet 12-1-5 of the pyrolysis gas of the gas-solid separator is about 400-.
With reference to fig. 1, a pyrolysis gas bypass pipeline 21-2 is connected to a pyrolysis gas outlet 3-1-3 of the roasting furnace for discharging the original gas into the air, wherein the pyrolysis gas bypass pipeline 21-2 is provided with an electric control valve for turning off and on. The original gas in the kiln 3-1 in the roasting furnace is evacuated, so that the pollution of the original gas to pyrolysis gas can be prevented.
In summary, the arsenic-containing gas treatment device of the high-arsenic metal ore powder dearsenification equipment is formed by sequentially connecting a temperature-controllable high-temperature gas-solid separator, a smoke indirect heat exchanger, a condensation arsenic collecting device, an arsenic collecting cloth bag, a high-temperature closed reduction furnace and a crystallization tank, so that the pyrolysis gas containing arsenic oxide is treated to obtain the simple substance arsenic. The pyrolysis gas resource containing arsenic oxide is recycled, the investment scale of the arsenic-containing gas treatment device and the difficulty of waste gas treatment are greatly reduced, and the effects of energy conservation and emission reduction are remarkable.
Please refer to fig. 4 and fig. 5, and also refer to the schematic structural diagram of the apparatus for removing arsenic from high-arsenic metal ore powder in fig. 1. The invention also provides a dearsenification method for the high-arsenic metal mineral powder, which uses the equipment for dearsenification of the high-arsenic metal mineral powder to carry out the dearsenification operation of the mineral powder, and the equipment for dearsenification of the high-arsenic metal mineral powder mainly comprises a primary preheating furnace 2, a secondary oxygen control roasting furnace 3, a flue gas main pipe 8, a combustion chamber 9, a combustion machine 10, a flue gas purification device 4 and an arsenic-containing gas treatment device. The primary preheating furnace 2 comprises a preheating furnace inner kiln 2-1 and a preheating furnace jacket 2-2. The kiln 2-1 in the preheating furnace is provided with a preheating furnace feed inlet 2-1-1 and a preheating furnace discharge outlet 2-1-2. The preheating furnace jacket 2-2 is provided with a preheating furnace flue gas inlet 2-2-1 and a preheating furnace flue gas outlet 2-2-2. The secondary oxygen control roasting furnace 3 comprises a roasting furnace inner kiln 3-1 and a roasting furnace jacket 3-2. The kiln 3-1 in the roasting furnace is provided with a roasting furnace feed inlet 3-1-1, a roasting furnace discharge outlet 3-1-2 and a roasting furnace pyrolysis gas outlet 3-1-3. The flue gas main pipe 8 is provided with a main pipe flue gas inlet 8-1 and a first main pipe flue gas outlet 8-2. The combustion chamber 9 is provided with a combustion chamber flue gas outlet 9-1.
The arsenic removal method comprises the following steps:
s11: conveying high-arsenic metal ore powder into a kiln 2-1 in a preheating furnace from a feed inlet 2-1-1 of the preheating furnace, preheating the high-arsenic metal ore powder by high-temperature flue gas in a jacket 2-2 of the preheating furnace, outputting the high-arsenic metal ore powder from a discharge outlet 2-1-2 of the preheating furnace, and inputting the high-arsenic metal ore powder into the kiln 3-1 in a roasting furnace through a feed inlet 3-1-1 of the roasting furnace;
s12: high-arsenic metal ore powder in a kiln 3-1 in a roasting furnace is heated and pyrolyzed by high-temperature flue gas in a roasting furnace jacket 3-2, and then residues after pyrolysis and gasification are output through a roasting furnace discharge port 3-1-2;
s13: pyrolysis gas generated after pyrolysis and gasification of high-arsenic metal mineral powder in a kiln 3-1 in a roasting furnace is discharged through a pyrolysis gas outlet 3-1-3 of the roasting furnace, and waste gas treatment is carried out through an arsenic-containing gas treatment device.
Wherein the high-temperature flue gas in the roasting furnace jacket 3-2 is generated by the following steps:
s14: combustible gas and air are mixed by a burner 10 and then are combusted in a combustion chamber 9, and the generated high-temperature flue gas is output through a flue gas outlet 9-1 of the combustion chamber and then is input into a flue gas main pipe 8 through a flue gas inlet 8-1 of the main pipe;
s15: outputting high-temperature flue gas in a flue gas main pipe 8 through a first main pipe flue gas outlet 8-2, and inputting the high-temperature flue gas into a roasting furnace jacket 3-2 through a roasting furnace flue gas inlet 3-2-1;
the high-temperature flue gas in the preheating furnace jacket 2-2 is generated by the following steps:
s16: high-temperature flue gas in the roasting furnace jacket 3-2 is output through a roasting furnace flue gas outlet 3-2-2 and then input into a preheating furnace jacket 2-2 through a preheating furnace flue gas inlet 2-2-1.
With reference to fig. 1, if N (N >1) flue gas inlets 3-2-1 of the high-arsenic metal ore powder dearsenification device are uniformly distributed on the axial side wall of the roasting furnace jacket 3-2, N flue gas outlets 8-2 of the first main pipe are uniformly distributed on the axial side wall of the flue gas main pipe 8, the N flue gas outlets 8-2 of the first main pipe are correspondingly connected with the N roasting furnace flue gas inlets 3-2-1 through N flue gas channels 7, and the N flue gas channels 7 are respectively provided with an electric control valve for adjusting the gas flow. In step S15, the high-temperature flue gas in the flue gas main pipe 8 is output through the first main pipe flue gas outlet 8-2, and the temperature near the flue gas outlet 3-2-2 of the roasting furnace can be within a set range by adopting the following two ways.
The first mode is that when the temperature close to the roasting furnace flue gas outlet 3-2-2 is lower than a first set temperature, an electric control valve on a flue gas channel 7 close to the roasting furnace flue gas outlet 3-2-2 is adjusted to increase the gas quantity of high-temperature flue gas; when the temperature close to the roasting furnace flue gas outlet 3-2-2 is higher than a second set temperature which is higher than the first set temperature, the electric control valve on the flue gas channel 7 close to the roasting furnace flue gas outlet 3-2-2 is adjusted to reduce the gas amount of the high-temperature flue gas.
The second mode is that when the temperature far away from the roasting furnace flue gas outlet 3-2-2 is higher than a second set temperature, the electric control valve on the part of the flue gas channel 7 far away from the roasting furnace flue gas outlet 3-2-2 is turned off; when the temperature far away from the roasting furnace flue gas outlet 3-2-2 is lower than the first set temperature, the electric control valve on the part of the flue gas channel 7 far away from the roasting furnace flue gas outlet 3-2-2 is opened again.
Referring to fig. 1, if a flue gas outlet pipe 24 of the roasting furnace is connected between the flue gas outlet 3-2-2 of the roasting furnace and the flue gas inlet 2-2-1 of the preheating furnace, an electric control valve for turning off and turning on high-temperature flue gas is arranged on the flue gas outlet pipe 24 of the roasting furnace. And step S11, the preheating furnace inner kiln 2-1 conveys the high-arsenic metal ore powder to the roasting furnace inner kiln 3-1 in an intermittent and centralized conveying mode. Firstly, closing a feed port 3-1-1 of a roasting furnace, simultaneously opening an electric control valve on a roasting furnace flue gas outlet pipe 24 to input high-temperature flue gas in a roasting furnace jacket 3-2 into a preheating furnace jacket 2-2, opening the feed port 3-1-1 of the roasting furnace after a first set time, simultaneously closing the electric control valve on the roasting furnace flue gas outlet pipe 24 to stop inputting the high-temperature flue gas in the roasting furnace jacket 3-2 into the preheating furnace jacket 2-2, closing the feed port 3-1-1 of the roasting furnace again after a second set time, and simultaneously opening the electric control valve on the roasting furnace flue gas outlet pipe 24 to input the high-temperature flue gas in the roasting furnace jacket 3-2 into the preheating furnace jacket 2-2 again. The method can ensure that the temperature of the kiln 3-1 in the roasting furnace is more stable and the pyrolysis and gasification are more sufficient.
With reference to fig. 1, if the pyrolysis gas outlet 3-1-3 of the roaster is connected with a pyrolysis gas bypass pipeline 21-2. Before step S11, the arsenic removing method further comprises the steps of opening an electric control valve on the pyrolysis gas bypass pipeline 21-2, evacuating the residual pyrolysis gas in the roasting furnace jacket 3-2, and after the set time is reached, closing the electric control valve on the pyrolysis gas bypass pipeline 21-2. The original gas in the kiln 3-1 in the roasting furnace is evacuated, so that the pollution of the original gas to pyrolysis gas can be prevented.
Referring to fig. 1, if the arsenic-containing gas treatment device includes a condensation arsenic collecting device 13, an arsenic collecting cloth bag 20, a high-temperature closed reduction furnace 14, a crystallization tank 15, and a gas purification device 16. The condensation arsenic collecting device 13 is provided with a condenser pyrolysis gas inlet 13-1, a condenser pyrolysis gas outlet 13-2 and a condenser powder outlet 13-3. The arsenic collecting cloth bag 20 is provided with a cloth bag inlet and a cloth bag outlet. The high-temperature closed reduction furnace 14 includes a lower reduction furnace 14-1 and an upper reduction furnace 14-2. The lower reducing furnace 14-1 is provided with a lower reducing furnace inlet 14-1-1, and the upper reducing furnace 14-2 is provided with an upper reducing furnace outlet 14-2-1. The crystallizing tank 15 is provided with a crystallizing tank inlet 15-1, a crystallizing tank material outlet 15-2 and a crystallizing tank gas outlet 15-3.
In step S13, the exhaust gas treatment specifically includes the steps of:
s21: pyrolysis gas output from a pyrolysis gas outlet 3-1-3 of the roasting furnace is input into a condensation arsenic-collecting device 13 through a pyrolysis gas inlet 13-1 of a condenser, the condensation arsenic-collecting device 13 carries out condensation treatment on the pyrolysis gas, and condensed arsenic oxide powder is output through a powder output port 13-3 of the condenser and then input into an arsenic-collecting cloth bag 20 through a cloth bag inlet;
s22: the arsenic collecting cloth bag 20 is used for collecting and treating arsenic oxide powder, the arsenic oxide powder is output through a cloth bag outlet after reaching a set amount and is input into a lower reduction furnace 14-1 through a lower reduction furnace inlet 14-1-1, and the arsenic oxide powder is volatilized under a high-temperature closed condition;
s23: charcoal powder is added to the upper reduction furnace 14-2 AS a reducing agent, and arsenic oxide volatilized in the lower reduction furnace 14-1 is reduced by a carbon reduction method to generate arsenic gas having a chemical formula of AS2O3+3C ═ 2AS +3 CO. The generated arsenic gas and carbon monoxide are output through an outlet 14-2-1 of the upper reduction furnace and input into a crystallizing tank 15 through an inlet 15-1 of the crystallizing tank;
s24: the arsenic gas is separated out by the crystallizing tank 15 to form simple substance arsenic, the simple substance arsenic is output through a crystallizing tank material outlet 15-2, and the carbon monoxide is output from a crystallizing tank gas outlet 15-3 and is conveyed by a pipeline to be connected with a gas purifying device 16 for purifying.
Referring to fig. 1, if the flue gas main pipe 8 is further provided with a second main pipe flue gas outlet 8-3, the arsenic-containing gas treatment device further comprises a temperature-controllable high-temperature gas-solid separator 12. The temperature-controllable high-temperature gas-solid separator 12 comprises a gas-solid separator inner cylinder 12-1 and a gas-solid separator outer cylinder 12-2. The inner cylinder 12-1 of the gas-solid separator comprises a purification cavity 12-1-1 at the upper part, an ash discharge structure 12-1-2 at the lower part and a plurality of filtering membrane tubes 12-1-3. The ash discharging structure 12-1-2 is provided with an ash discharging port 12-1-6. The purification cavity 12-1-1 is provided with a gas-solid separator pyrolysis gas inlet 12-1-4 and a gas-solid separator pyrolysis gas outlet 12-1-5. The outer cylinder 12-2 of the gas-solid separator is provided with a gas-solid separator flue gas inlet 12-2-1 and a gas-solid separator flue gas outlet 12-2-2. The high-arsenic metal ore powder arsenic removal equipment further comprises a main pyrolysis gas pipeline 21-1, a flue gas heating pipeline 22-2 outside the gas-solid separator and a flue gas heating pipeline 19 of the gas-solid separator.
Step S21 is preceded by the steps of:
s31: opening an electric control valve on a main pyrolysis gas pipeline 21-1 and a heating flue gas pipeline 22-2 outside the gas-solid separator;
s32: and (4) conveying pyrolysis gas discharged from a pyrolysis gas outlet 3-1-3 of the roasting furnace in the step S13 through a pyrolysis gas main pipeline 21-1, inputting the pyrolysis gas into a purification cavity 12-1-1 at the upper part of an inner cylinder 12-1 of a gas-solid separator through a pyrolysis gas inlet 12-1-4 of the gas-solid separator, and filtering dust by using a filtering membrane pipe 12-1-3. Outputting the filtered pyrolysis gas through a pyrolysis gas outlet 12-1-5 of a gas-solid separator, inputting the pyrolysis gas into a condensation arsenic collecting device 13 through a pyrolysis gas inlet 13-1 of the condenser, and discharging the filtered dust into an ash discharging structure 12-1-2 at the lower part of an inner cylinder 12-1 of the gas-solid separator through an ash discharging port 12-1-6;
s33: outputting the high-temperature flue gas of the flue gas main pipe 8 in the step S14 through a flue gas outlet 8-3 of a second main pipe, sequentially conveying the high-temperature flue gas through a heating flue gas pipeline 19 of the gas-solid separator and a heating flue gas pipeline 22-2 outside the gas-solid separator, inputting the high-temperature flue gas into an outer cylinder 12-2 of the gas-solid separator through a flue gas inlet 12-2-1 of the gas-solid separator, and heating the pyrolysis gas in the inner cylinder 12-1 of the gas-solid separator.
With reference to fig. 1, if a preheating flue gas pipe 22-1 inside the gas-solid separator is further provided between the main pyrolysis gas pipe 21-1 and the heating flue gas pipe 22-2 outside the gas-solid separator. Before step S31, the arsenic removing method further includes the following steps:
s41: the electric control valve on the main pyrolysis gas pipeline 21-1 is closed, and the electric control valve on the preheating flue gas pipeline 22-1 in the gas-solid separator is opened;
s42: in the step S14, after the high-temperature flue gas of the flue gas main pipe 8 is output through the flue gas outlet 8-3 of the second main pipe, the high-temperature flue gas is conveyed through the heating flue gas pipeline 19 of the gas-solid separator and the preheating flue gas pipeline 22-1 in the gas-solid separator in sequence, and then is input into the inner cylinder 12-1 of the gas-solid separator through the pyrolysis gas inlet 12-1-4 of the gas-solid separator to preheat the inner cylinder 12-1 of the gas-solid separator.
With reference to fig. 1, the arsenic removing apparatus for arsenic-containing gas further includes an indirect flue gas heat exchanger having a heat exchanger inlet and a heat exchanger outlet, in step S32, the pyrolysis gas is output from the pyrolysis gas outlet of the gas-solid separator, and then enters the indirect flue gas heat exchanger through the heat exchanger inlet to perform cooling operation, and the cooled pyrolysis gas is output through the heat exchanger outlet and then input into the arsenic collecting apparatus through the pyrolysis gas inlet of the condenser to prevent the arsenic collecting bag from being burned out due to high temperature.
In summary, in the method for removing arsenic from high-arsenic metal ore powder, the pyrolysis gas containing arsenic oxide is treated by the arsenic-containing gas treatment device formed by sequentially connecting the temperature-controllable high-temperature gas-solid separator, the smoke indirect heat exchanger, the condensation arsenic-collecting device, the arsenic-collecting cloth bag, the high-temperature closed reduction furnace and the crystallization tank to obtain the elemental arsenic. The pyrolysis gas resource containing arsenic oxide is recycled, the investment scale of the arsenic-containing gas treatment device and the difficulty of waste gas treatment are greatly reduced, and the effects of energy conservation and emission reduction are remarkable.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (9)
1. A high arsenic metal ore powder dearsenification equipment is characterized by comprising:
the temperature-controllable high-temperature gas-solid separator is used for separating dust from pyrolysis gas containing arsenic, and comprises a gas-solid separator inner cylinder for conveying the pyrolysis gas and a gas-solid separator outer cylinder for conveying high-temperature flue gas, wherein the gas-solid separator inner cylinder is nested in the gas-solid separator outer cylinder; the inner cylinder of the gas-solid separator comprises an upper purification cavity, a lower ash discharge structure and a plurality of filtering membrane pipes which are uniformly arranged in the purification cavity in the longitudinal direction; the purification cavity is provided with a pyrolysis gas inlet of a gas-solid separator and a pyrolysis gas outlet of the gas-solid separator, the pyrolysis gas inlet of the gas-solid separator is connected with the corresponding pyrolysis gas outlet of the roasting furnace through a main pyrolysis gas pipeline, the main pyrolysis gas pipeline is provided with an electric control valve for shutting off and opening pyrolysis gas, the ash discharge structure is in a conical shape with a wide upper part and a narrow lower part, and the bottom of the ash discharge structure is provided with an ash discharge port for discharging dust; the outer cylinder of the gas-solid separator is provided with a gas-solid separator flue gas inlet and a gas-solid separator flue gas outlet, the gas-solid separator flue gas inlet is connected with the corresponding second main pipe flue gas outlet sequentially through a gas-solid separator external heating flue gas pipeline and a gas-solid separator heating flue gas pipeline, the gas-solid separator external heating flue gas pipeline is provided with an electric control valve for adjusting gas flow, and the gas-solid separator flue gas outlet is connected with a flue gas purification device;
the condensation arsenic collecting device is used for condensing the pyrolysis gas into arsenic oxide powder and is provided with a condenser pyrolysis gas inlet connected with the pyrolysis gas outlet of the gas-solid separator and a condenser powder output port used for outputting the arsenic oxide powder;
the arsenic collecting cloth bag is used for collecting arsenic oxide powder and is provided with a cloth bag inlet connected with the condenser powder output port and a cloth bag outlet used for outputting the arsenic oxide powder;
the high-temperature closed reduction furnace is used for reducing arsenic in arsenic oxide powder and comprises a lower reduction furnace for placing the arsenic oxide powder and an upper reduction furnace for placing a reducing agent, the lower reduction furnace is provided with a lower reduction furnace inlet which is connected with the outlet of the cloth bag, and the upper reduction furnace is provided with an upper reduction furnace outlet;
the crystallizing tank is used for separating out reduced simple substance arsenic and is provided with a crystallizing tank inlet connected with the outlet of the upper reducing furnace and a crystallizing tank material outlet used for outputting the simple substance arsenic;
the primary preheating furnace is used for preheating the high-arsenic metal ore powder and comprises a preheating furnace inner kiln used for conveying the high-arsenic metal ore powder and a preheating furnace jacket used for conveying high-temperature flue gas; one end of the kiln in the preheating furnace is provided with a preheating furnace feeding hole, and the other end of the kiln in the preheating furnace is provided with a preheating furnace discharging hole; the preheating furnace jacket surrounds the periphery of the outer wall of the inner kiln of the preheating furnace, one end of the preheating furnace jacket is provided with a preheating furnace flue gas inlet, and the other end of the preheating furnace jacket is provided with a preheating furnace flue gas outlet;
the secondary oxygen control roasting furnace is used for heating and pyrolyzing the high-arsenic metal ore powder and comprises a roasting furnace inner kiln used for conveying the high-arsenic metal ore powder and a roasting furnace jacket used for conveying high-temperature flue gas; one end of the kiln in the roasting furnace is provided with a roasting furnace feed inlet connected with the discharge port of the preheating furnace, the other end of the kiln in the roasting furnace is provided with a roasting furnace discharge port and a roasting furnace pyrolysis gas outlet, and the roasting furnace pyrolysis gas outlet is connected with the pyrolysis gas inlet of the gas-solid separator through the pyrolysis gas main pipeline; the roasting furnace jacket surrounds the periphery of the outer wall of the kiln in the roasting furnace, a roasting furnace flue gas inlet is formed in one side of the roasting furnace jacket, a roasting furnace flue gas outlet is formed in the other side of the roasting furnace jacket, and the roasting furnace flue gas outlet is connected with the preheating furnace flue gas inlet;
the flue gas main pipe is used for conveying high-temperature flue gas and comprises a main pipe flue gas inlet, a first main pipe flue gas outlet and a second main pipe flue gas outlet, the first main pipe flue gas outlet is connected with the roasting furnace flue gas inlet, and the second main pipe flue gas outlet is connected with the heating flue gas pipeline of the gas-solid separator; and the number of the first and second groups,
the combustion chamber is used for generating high-temperature flue gas and is provided with a combustion chamber flue gas outlet connected with the main pipe flue gas inlet;
wherein, the roasting furnace flue gas outlet is arranged at one end close to the feeding hole of the roasting furnace;
the number of the roasting furnace flue gas inlets is N, wherein N is greater than 1, and the flue gas inlets are uniformly distributed on the axial side wall of the roasting furnace jacket;
the number of the first main pipe smoke outlets is N, the first main pipe smoke outlets are evenly distributed on the axial side wall of the main smoke pipe, the N first main pipe smoke outlets are connected with the N roasting furnace smoke inlets in a one-to-one correspondence mode through N smoke channels, and the N smoke channels are all provided with electric control valves used for adjusting air quantity.
2. The high-arsenic metal ore powder arsenic removal equipment as claimed in claim 1, wherein an internal preheated flue gas pipeline of the gas-solid separator is connected between the main pyrolysis gas pipeline and the external heated flue gas pipeline of the gas-solid separator, and an electric control valve for turning off and on is arranged on the internal preheated flue gas pipeline.
3. The apparatus of claim 1, wherein the arsenic-bearing gas treatment apparatus further comprises a flue gas indirect heat exchanger for cooling the pyrolysis gas to prevent burning out of the arsenic collecting cloth bag, and the apparatus is provided with a heat exchanger inlet and a heat exchanger outlet, the heat exchanger inlet is connected to the pyrolysis gas outlet of the gas-solid separator, and the heat exchanger outlet is connected to the pyrolysis gas inlet of the condenser.
4. The apparatus according to claim 1, wherein the arsenic-containing gas treatment device further comprises a gas purification device for treating toxic gas, and the condensation arsenic collecting device is further provided with a condenser pyrolysis gas outlet connected with the gas purification device; the crystallizing tank is also provided with a crystallizing tank gas outlet which is connected with the gas purifying device.
5. The equipment for removing arsenic from high-arsenic metal ore powder according to claim 1, wherein the diameter of the flue gas inlet of the roasting furnace is gradually reduced from the end close to the flue gas outlet of the roasting furnace to the end far away from the flue gas outlet of the roasting furnace, and the diameters of the flue gas channel and the flue gas outlet of the first main pipe are matched with the diameter of the flue gas inlet of the roasting furnace.
6. The apparatus according to claim 1, wherein a pyrolysis gas bypass pipeline is connected to the outlet of the roaster for discharging the original gas into the air, and the pyrolysis gas bypass pipeline is provided with an electrically controlled valve for closing and opening.
7. The apparatus of claim 1, wherein the inlet for flue gas from the preheater furnace is located at an end of the preheater furnace proximate to the exit of the preheater furnace.
8. The apparatus for dearsenifying metallic ore powder with high arsenic content as claimed in claim 1,
the primary preheating furnace is transversely obliquely arranged and axially rotates, and one end of the primary preheating furnace, which is close to the discharge port of the preheating furnace, is lower than one end of the primary preheating furnace, which is close to the feed port of the preheating furnace;
the two-stage oxygen control roasting furnace is transversely obliquely arranged and axially rotates, and one end of the two-stage oxygen control roasting furnace, which is close to the discharge port of the roasting furnace, is lower than one end of the two-stage oxygen control roasting furnace, which is close to the feed port of the roasting furnace.
9. The apparatus according to claim 1, wherein a preheating furnace tail gas main pipeline is connected between the tail gas blower and the flue gas purification device, a high-temperature flue gas pipeline is connected between the flue gas outlet of the combustion chamber and the flue gas inlet of the main pipe, a preheating furnace tail gas bypass pipeline is further connected between the preheating furnace tail gas main pipeline and the high-temperature flue gas pipeline, and the high-temperature flue gas pipeline and the preheating furnace tail gas bypass pipeline are both provided with electric control valves for adjusting gas flow.
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| CN112391524A (en) | 2021-02-23 |
| CN113457293A (en) | 2021-10-01 |
| CN112391524B (en) | 2021-08-10 |
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