CN215489744U - Cyanide tailings decyanation system - Google Patents
Cyanide tailings decyanation system Download PDFInfo
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- CN215489744U CN215489744U CN202122075718.5U CN202122075718U CN215489744U CN 215489744 U CN215489744 U CN 215489744U CN 202122075718 U CN202122075718 U CN 202122075718U CN 215489744 U CN215489744 U CN 215489744U
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- secondary decomposition
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- 238000007255 decyanation reaction Methods 0.000 title claims abstract description 76
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000000197 pyrolysis Methods 0.000 claims abstract description 183
- 238000001035 drying Methods 0.000 claims abstract description 111
- 239000000463 material Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims description 186
- 238000000354 decomposition reaction Methods 0.000 claims description 86
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 47
- 239000003546 flue gas Substances 0.000 claims description 47
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- 238000001914 filtration Methods 0.000 claims description 25
- 238000000746 purification Methods 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 21
- 238000007599 discharging Methods 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- 238000009833 condensation Methods 0.000 claims description 15
- 230000005494 condensation Effects 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 239000012528 membrane Substances 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000008676 import Effects 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 abstract description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The utility model provides a cyanide tailing decyanation system which is used for carrying out drying and pyrolytic decyanation on cyanide tailings and is characterized by comprising a drying and pyrolytic integrated furnace, wherein the drying and pyrolytic integrated furnace is provided with a material inlet used for inputting cyanide tailings and a material outlet used for outputting pyrolytic tailings, the drying and pyrolytic integrated furnace is divided into a low-temperature section and a high-temperature section, the low-temperature section is close to the material inlet and used for carrying out low-temperature heating drying on the cyanide tailings to change water in the cyanide tailings into water vapor, the high-temperature section is close to the material outlet, and the high-temperature section is used for carrying out high-temperature heating pyrolytic decyanation on the dried cyanide tailings. According to the cyanide tailing decyanation system, low-temperature heating and drying are firstly carried out on cyanide tailings through the low-temperature section, so that water in the cyanide tailings is changed into water vapor, the weight and the volume of the cyanide tailings are reduced, and then high-temperature heating pyrolysis decyanation is carried out on the dried cyanide tailings through the high-temperature section, so that the pyrolysis efficiency is effectively improved, and a heat source is saved.
Description
Technical Field
The utility model relates to the technical field of solid waste treatment, in particular to a cyanide tailing decyanation system.
Background
In gold mines, cyanidation leaching is still the treatment process of the main gold-containing ores, and cyanidation tailings are the main solid waste. Cyanide is remained in the cyanidation tailings and is listed in the national hazardous waste list. Cyanide in the tailings can cause great influence on the environment, so that the environment is protected, and land resources are occupied. Therefore, the development of harmless disposal and resource utilization of cyanidation tailings becomes a problem which must be solved for sustainable development of gold production enterprises. When the cyaniding tailing decyanation system in the prior art carries out pyrolysis decyanation on cyaniding tailing, the pyrolysis efficiency is low, and the heat source consumption is large.
Therefore, it is necessary to provide a cyanide tailing decyanation system to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a cyanide tailing decyanation system, which is characterized in that low-temperature heating and drying is carried out on cyanide tailings through a low-temperature section of a drying and pyrolyzing integrated furnace, so that water in the cyanide tailings is changed into water vapor, the weight and the volume of the cyanide tailings are reduced, and high-temperature heating, pyrolyzing and decyanating are carried out on the dried cyanide tailings through a high-temperature section of a drying and pyrolyzing integrated furnace, so that the technical problems of low pyrolysis efficiency and high heat source consumption when the cyanide tailings are pyrolyzed and decyanated by a cyanide tailing decyanation system in the prior art are solved.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
the utility model provides a cyanide tailings decyanation system for carry out mummification and pyrolysis decyanation to cyanide tailings, cyanide tailings decyanation system includes the integrative stove of mummification pyrolysis, and its axial both ends are provided with the material import that is used for inputing cyanide tailings respectively and are used for exporting the material export of pyrolysis tailings, the integrative stove of mummification pyrolysis divide into low temperature section and high temperature section, the low temperature section is close to the material import, the low temperature section is used for carrying out the low temperature heating mummification to cyanide tailings, makes the moisture in the cyanide tailings become steam, the high temperature section is close to the material export, the high temperature section is used for carrying out the high temperature heating pyrolysis decyanation to the cyanide tailings after the mummification.
In the cyaniding tailing decyanation system of the utility model, the drying and pyrolysis integrated furnace comprises:
the first drying pyrolysis inner furnace is used for placing cyaniding tailings, and the material inlet and the material outlet are respectively arranged at two axial ends of the first drying pyrolysis inner furnace; and the number of the first and second groups,
the first drying pyrolysis jacket wraps the periphery of the inner furnace of the first drying pyrolysis, the first drying pyrolysis jacket is used for containing high-temperature flue gas, a plurality of first flue gas inlets and a first flue gas outlet used for discharging the flue gas are arranged in the outer portion of the first drying pyrolysis jacket along the axial direction of the outer portion of the first drying pyrolysis jacket, the first flue gas inlets are connected with flue gas pipelines used for inputting the high-temperature flue gas, and the first flue gas inlets are multiple electric control valves used for adjusting the gas amount are arranged on the flue gas pipelines.
In the cyanided tailing decyanation system, a partition board is arranged in the first drying pyrolysis jacket along the radial direction, the partition board divides the first drying pyrolysis jacket into a drying jacket and a pyrolysis jacket, the drying jacket is close to the material inlet, the drying jacket is used for inputting low-temperature flue gas, the pyrolysis jacket is close to the material outlet, and the pyrolysis jacket is used for inputting high-temperature flue gas.
In the cyaniding tailing decyanation system of the utility model, the drying and pyrolysis integrated furnace comprises:
the second drying pyrolysis inner furnace is used for placing cyaniding tailings, and the material inlet and the material outlet are respectively arranged at two axial ends of the second drying pyrolysis inner furnace; and the number of the first and second groups,
the second drying pyrolysis jacket wraps the periphery of the second drying pyrolysis inner furnace, the second drying pyrolysis jacket is used for containing high-temperature flue gas, a second flue gas inlet is formed in one end, close to the material outlet, of the second drying pyrolysis jacket, and a second flue gas outlet is formed in one end, close to the material inlet, of the second drying pyrolysis jacket.
In the cyaniding tailing decyanation system, the high-temperature section is provided with a first exhaust port for exhausting pyrolysis gas generated by the high-temperature section; the cyanidation tailings decyanation system further comprises:
the first atmosphere adjusting mechanism comprises a first atmosphere conveying pipeline and a first atmosphere adjusting valve, the first atmosphere conveying pipeline is used for conveying mixed gas of nitrogen and oxygen required during material pyrolysis, the first atmosphere conveying pipeline is located inside the drying and pyrolysis integrated furnace, the first atmosphere adjusting valve is located outside the drying and pyrolysis integrated furnace, and the first atmosphere adjusting valve is used for adjusting the proportion of the mixed gas of the nitrogen and the oxygen conveyed by the first atmosphere conveying pipeline; and the number of the first and second groups,
and the first gas online detector is connected with the first exhaust port and used for detecting the content of harmful gas in the pyrolysis gas exhausted by the first exhaust port so as to adjust the first atmosphere adjusting valve.
In the cyaniding tailing decyanation system, the first atmosphere conveying pipeline extends to the other end along one end of the drying and pyrolysis integrated furnace, is positioned at the center of the drying and pyrolysis integrated furnace, and is provided with a plurality of uniformly distributed air outlets for outputting mixed gas of nitrogen and oxygen.
In the cyanide tailing decyanation system of the utility model,
the two axial ends of the drying and pyrolysis integrated furnace are respectively a feeding end and a discharging end, the material inlet is located at the feeding end, the material outlet is located at the discharging end, and the first exhaust port is located at the discharging end;
the feeding end is provided with a second exhaust port for exhausting dried water vapor generated by the low-temperature section and pyrolysis gas generated by the high-temperature section;
the cyaniding tailings decyanation system further comprises a second gas online detector which is connected with the second exhaust port and used for detecting the content of harmful gas in pyrolysis gas exhausted from the second exhaust port, so that the first atmosphere regulating valve is regulated.
In the cyaniding tailing decyanation system of the present invention, the cyaniding tailing decyanation system further includes a secondary decomposition mechanism, and the secondary decomposition mechanism includes:
the condenser comprises a condensation inlet and a condensation outlet, the condensation inlet is connected with the second exhaust port, the condenser is used for condensing the dried water vapor discharged from the second exhaust port, and the condensation outlet is used for discharging non-condensable gas; and the number of the first and second groups,
the secondary decomposition tower is used for heating and pyrolyzing the pyrolysis gas discharged by the drying and pyrolysis integrated furnace again, the secondary decomposition tower comprises a secondary decomposition inner furnace and a secondary decomposition jacket, the secondary decomposition inner furnace comprises two secondary decomposition gas inlets and a secondary decomposition gas outlet, one secondary decomposition gas inlet is connected with the condensation outlet, the other secondary decomposition gas inlet is connected with the first exhaust port, and the secondary decomposition gas outlet is used for discharging pyrolysis tail gas generated by the secondary decomposition tower; the secondary decomposition jacket is wrapped on the periphery of the secondary decomposition inner furnace and used for containing high-temperature flue gas.
In the cyanide tailing decyanation system of the utility model,
the cyanidation tailings decyanation system further comprises:
an input port of the tail gas main pipeline is connected with the secondary decomposed gas outlet, and the tail gas main pipeline is used for conveying the pyrolysis tail gas exhausted from the secondary decomposed gas outlet;
an input port of the purification pipeline is connected with an output port of the tail gas main pipeline, and the purification pipeline is provided with an electric control valve for turning off and on;
an input port of the return pipeline is connected with an output port of the main tail gas pipeline, an output port of the return pipeline is connected with the secondary decomposed gas inlet, and the return pipeline is provided with an electric control valve for turning off and on;
the tail gas purification system is connected with the output port of the purification pipeline and is used for purifying the output pyrolysis tail gas;
the secondary decomposition mechanism further comprises:
the third gas online detector is arranged on the tail gas main pipeline and is used for detecting the content of harmful gas in the pyrolysis tail gas conveyed by the tail gas main pipeline, when the harmful gas in the pyrolysis tail gas is detected to be lower than a set requirement, the pyrolysis tail gas is conveyed to the tail gas purification system through the purification pipeline for treatment, and when the harmful gas in the pyrolysis tail gas is detected to be higher than the set requirement, the pyrolysis tail gas is conveyed to the secondary decomposition tower through the backflow pipeline for secondary treatment; and the number of the first and second groups,
and the second atmosphere adjusting mechanism comprises a second atmosphere conveying pipeline and a second atmosphere adjusting valve, the second atmosphere conveying pipeline is used for conveying mixed gas required during secondary decomposition, the second atmosphere conveying pipeline is positioned in the secondary decomposition inner furnace, the second atmosphere adjusting valve is positioned outside the secondary decomposition tower, and the second atmosphere adjusting valve is used for adjusting the proportion of the mixed gas conveyed by the second atmosphere conveying pipeline.
In the cyanide tailing decyanation system, the secondary decomposition inner furnace is divided into an upper filtering cavity and a lower ash discharge cavity, the ash discharge cavity is conical, and the bottom of the ash discharge cavity is provided with an ash discharge port; the secondary decomposition inner furnace further comprises:
the support plate is fixed in the filter cavity along the radial direction of the filter cavity, the support plate divides the filter cavity into two parts, the part far away from the ash discharge cavity is an upper cavity, the part close to the ash discharge cavity is a lower cavity, the capacity of the upper cavity is smaller than that of the lower cavity, the secondary decomposition gas inlet and the secondary decomposition gas outlet are respectively positioned at two opposite sides of the lower cavity, and the secondary decomposition gas outlet is higher than the secondary decomposition gas inlet;
the filtering membrane tubes are fixed in the filtering cavity along the axial direction of the filtering cavity, and penetrate and are fixed on the supporting plate; and the number of the first and second groups,
the blowback pipe, the one end of blowback pipe is located the outside, and the other end is located go up the cavity, the blowback pipe is located the one end of going up the cavity is provided with a plurality of blowbacks, and is a plurality of the blowback is respectively with many the filtration membrane pipe corresponds the intercommunication, the blowback pipe is used for making the intraductal dust of filtration membrane is followed arrange the ash hole and discharges.
Compared with the prior art, the utility model has the beneficial effects that: according to the cyaniding tailing decyanation system, low-temperature heating and drying are firstly carried out on cyaniding tailings through the low-temperature section of the drying and pyrolyzing integrated furnace, so that water in the cyaniding tailings is changed into water vapor, the weight and the volume of the cyaniding tailings are reduced, and then high-temperature heating, pyrolyzing and decyanating are carried out on the dried cyaniding tailings through the high-temperature section of the drying and pyrolyzing integrated furnace, so that the pyrolysis efficiency is effectively improved, and a heat source is saved.
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 a first embodiment of a cyanidation tailings decyanation system of the present invention.
FIG. 2 is a schematic structural diagram of a second embodiment of the cyanidation tailings decyanation system of the present invention.
Wherein,
the labels of FIG. 1 are as follows:
11. a drying and pyrolysis integrated furnace 111, a flue gas pipeline,
12. a first atmosphere adjusting mechanism is arranged on the base,
13. a first gas on-line detector is arranged on the gas tank,
14. a second gas on-line detector is arranged on the gas tank,
15. a secondary decomposition mechanism for decomposing the waste water into a plurality of groups,
151. a condenser, a condenser and a water-cooling device,
152. a secondary decomposition tower is arranged on the bottom of the tower,
153. a third gas on-line detector is arranged on the gas tank,
154. a second atmosphere adjusting mechanism for adjusting the atmosphere of the gas,
16. a main pipeline of the tail gas,
17. the purification of the pipeline is carried out,
18. a return pipeline is arranged on the upper portion of the shell,
19. an exhaust gas purification system.
The labels of FIG. 2 are as follows:
21. drying and pyrolysis integrated furnace
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 utility model 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; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
When the cyaniding tailing decyanation system in the prior art carries out pyrolysis decyanation on cyaniding tailing, the pyrolysis efficiency is low, and the heat source consumption is large.
The following is a preferred embodiment of the cyanidation tailing decyanation system provided by the present invention that can solve the above technical problems.
Referring to fig. 1, a first embodiment of a cyanidation tailings decyanation system is provided. The cyaniding tailings decyanation system of this embodiment is used for carrying out mummification and pyrolysis decyanation to the cyaniding tailings, and the cyaniding tailings decyanation system includes the integrative stove 11 of mummification pyrolysis, and its axial both ends are provided with the material import that is used for inputing the cyaniding tailings respectively and are used for exporting the material export of pyrolysis tailings. The drying and pyrolysis integrated furnace 11 is divided into a low-temperature section and a high-temperature section, the low-temperature section is close to a material inlet, the low-temperature section is used for carrying out low-temperature heating and drying on cyaniding tailings to enable water in the cyaniding tailings to become water vapor, the high-temperature section is close to a material outlet, and the high-temperature section is used for carrying out high-temperature heating pyrolysis decyanation on the dried cyaniding tailings. The drying and pyrolysis integrated furnace 11 can be arranged as a rotary kiln with a high end and a low end, and pyrolysis tailings can slowly move from the head of the rotary kiln to the tail of the rotary kiln along with the rotation of the rotary kiln.
According to the cyanide tailing decyanation system, low-temperature heating and drying are firstly carried out on cyanide tailings through the low-temperature section of the drying and pyrolysis integrated furnace 11, so that water in the cyanide tailings is changed into water vapor, the weight and the volume of the cyanide tailings are reduced, and high-temperature heating, pyrolysis and decyanation are carried out on the dried cyanide tailings through the high-temperature section of the drying and pyrolysis integrated furnace 11, so that the pyrolysis efficiency is effectively improved, and a heat source is saved.
The drying and pyrolysis integrated furnace 11 comprises a first drying and pyrolysis inner furnace and a first drying and pyrolysis jacket. The first drying pyrolysis inner furnace is used for placing cyanide tailings, and the material inlet and the material outlet are respectively arranged at two axial ends of the first drying pyrolysis inner furnace. First mummification pyrolysis jacket parcel is in the week side of first mummification pyrolysis inner furnace, and first mummification pyrolysis jacket is used for holding high temperature flue gas, and the outside of first mummification pyrolysis jacket is provided with a plurality of first flue gas inlets and the first exhanst gas outlet who is used for the exhaust flue gas along its axial, and first flue gas inlet all is connected with the flue gas pipeline 111 that is used for inputing high temperature flue gas, all is provided with the automatically controlled valve that is used for the regulating gas volume on a plurality of flue gas pipeline 111. The structure can effectively control the low-temperature section and the high-temperature section to be at proper temperatures.
The partition board is arranged in the first drying pyrolysis jacket along the radial direction, the partition board divides the first drying pyrolysis jacket into a drying jacket and a pyrolysis jacket, the drying jacket is close to the material inlet, and the drying jacket is used for inputting low-temperature flue gas. The pyrolysis jacket is close to the material outlet and used for inputting high-temperature flue gas. The structure ensures that the high-temperature flue gas between the low-temperature section and the high-temperature section does not circulate, thereby being convenient for further effectively controlling the temperature of the low-temperature section and the high-temperature section.
The high-temperature section is provided with a first exhaust port for exhausting pyrolysis gas generated by the high-temperature section. The cyaniding tailing decyanation system also comprises a first atmosphere adjusting mechanism 12 and a first gas online detector 13. The first atmosphere adjusting mechanism 12 comprises a first atmosphere conveying pipeline and a first atmosphere adjusting valve, wherein the first atmosphere conveying pipeline is used for conveying mixed gas of nitrogen and oxygen required by pyrolysis of materials, and cyanide and thiocyanide in the furnace can be reacted into nitrogen, carbon dioxide and sulfur dioxide. The first atmosphere conveying pipeline is located inside the drying and pyrolysis integrated furnace 11, the first atmosphere adjusting valve is located outside the drying and pyrolysis integrated furnace 11, the first atmosphere adjusting valve is used for adjusting the gas quantity and the proportion of mixed gas of nitrogen and oxygen conveyed by the first atmosphere conveying pipeline, and the proportion of oxygen is 1-20%. The first gas online detector 13 is connected to the first exhaust port and is used for detecting the content of harmful gas, namely cyanide and sulfur dioxide, in the pyrolysis gas exhausted from the first exhaust port, so that the first atmosphere regulating valve is regulated to change the gas amount, and the purpose of complete purification is achieved.
The larger the proportion of cyanide in the cyanidation tailings, the more oxygen needs to be added, but the excessive oxygen can cause the generation of excessive toxic gas of sulfur dioxide, and the loss of sulfur in the cyanidation tailings is also caused, so that the secondary utilization of resources is not facilitated. Through the structure, the proportion of nitrogen and oxygen can be well controlled, and the sulfur in the cyaniding tailings can be kept as much as possible while ensuring the full decyanation of the cyaniding tailings.
The first atmosphere conveying pipeline extends to the other end along one end of the drying and pyrolysis integrated furnace 11, is located at the center of the drying and pyrolysis integrated furnace 11, and is provided with a plurality of uniformly distributed gas outlets for outputting mixed gas of nitrogen and oxygen. The structure enables the mixed gas of nitrogen and oxygen to be uniformly conveyed, and effectively improves the pyrolysis decyanation effect.
The axial both ends of integrative stove 11 of mummification pyrolysis are feed end and discharge end respectively, and the material import is located the feed end, and the material export is located the discharge end, and first exhaust port is located the discharge end. The feeding end is provided with a second exhaust port for exhausting the dried water vapor generated at the low-temperature section and the pyrolysis gas generated at the high-temperature section. The cyanidation tailings decyanation system further comprises a second gas online detector 14 which is connected with the second exhaust port and used for detecting the content of harmful gas in pyrolysis gas exhausted from the second exhaust port, so that the first atmosphere regulating valve is regulated. In the structure, the drying water vapor is discharged from the second exhaust port at the feeding end, so that the addition of excessive oxygen in the furnace can be avoided, the drying water vapor generated at the low-temperature section can be effectively discharged, and meanwhile, the proportion of nitrogen and oxygen can be further accurately controlled.
The cyanidation tailings decyanation system further comprises a secondary decomposition mechanism 15, and the secondary decomposition mechanism 15 comprises a condenser 151 and a secondary decomposition tower 152. The condenser 151 comprises a condensation inlet and a condensation outlet, the condensation inlet is connected with the second exhaust port, the condenser 151 is used for condensing the drying water vapor discharged from the second exhaust port, and the condensation outlet is used for discharging non-condensable gas. The secondary decomposition tower 152 is used for heating pyrolysis again to the pyrolysis gas that integrative stove 11 of mummification pyrolysis discharged, and the secondary decomposition tower 152 includes stove and secondary decomposition jacket in the secondary decomposition, and the stove includes two secondary decomposition gas entrances and secondary decomposition gas export in the secondary decomposition. One secondary decomposed gas inlet is connected to the condensation outlet, the other secondary decomposed gas inlet is connected to the first exhaust port, and the secondary decomposed gas outlet is used for exhausting the pyrolysis tail gas generated by the secondary decomposing tower 152. The secondary decomposition jacket is wrapped on the periphery of the secondary decomposition inner furnace and used for containing high-temperature flue gas. In the above structure, the condensed non-condensable gas enters the secondary decomposition tower 152, which greatly reduces the amount of water vapor entering the secondary decomposition tower 152, thereby reducing energy consumption and protecting the secondary decomposition tower 152. Above-mentioned structure can heat the pyrolysis gas that integrative stove of mummification pyrolysis 11 exhaust once more and pyrolyze, will contain cyanogen gas and be handled totally, reduces follow-up harmful gas purification treatment's the degree of difficulty, also protects the environment more.
The cyaniding tailing decyanation system also comprises a main tail gas pipeline 16, a purification pipeline 17, a return pipeline 18 and a tail gas purification system 19. The input port of the main tail gas pipeline 16 is connected with the secondary decomposed gas outlet, and the main tail gas pipeline 16 is used for conveying the pyrolysis tail gas exhausted from the secondary decomposed gas outlet. The input port of the purifying pipeline 17 is connected with the output port of the main tail gas pipeline 16, and the purifying pipeline 17 is provided with an electric control valve for turning off and turning on. An input port of the return pipeline 18 is connected with an output port of the main tail gas pipeline 16, an output port of the return pipeline 18 is connected with a secondary decomposed gas inlet, and the return pipeline 18 is provided with an electric control valve for turning off and turning on. The tail gas purification system 19 is connected with an output port of the purification pipeline 17 and used for purifying the output pyrolysis tail gas.
The secondary decomposition mechanism 15 further includes a third gas online detector 153 and a second atmosphere adjustment mechanism 154. Third gaseous on-line measuring appearance 153 sets up on tail gas trunk line 16 for detect the content of harmful gas in the pyrolysis tail gas that tail gas trunk line 16 carried, when detecting that harmful gas is less than the settlement requirement in the pyrolysis tail gas, the pyrolysis tail gas carries tail gas clean-up system 19 through purifying pipe 17 and handles, when detecting that harmful gas is higher than the settlement requirement in the pyrolysis tail gas, the pyrolysis tail gas carries secondary decomposition tower 152 through backflow pipeline 18 and handles once more. The second atmosphere adjusting mechanism 154 includes a second atmosphere delivery pipe for delivering a mixed gas required in the secondary decomposition, and a second atmosphere adjusting valve located inside the secondary decomposition inner furnace and outside the secondary decomposition tower 152 for adjusting a ratio of the mixed gas delivered by the second atmosphere delivery pipe. By adopting the structure, the pyrolysis tail gas discharged by the secondary decomposition tower 152 can be effectively controlled to reach the standard and then be subjected to subsequent purification treatment.
The secondary decomposition inner furnace is divided into a filtering cavity at the upper part and an ash discharging cavity at the lower part, the ash discharging cavity is conical, and the bottom of the ash discharging cavity is provided with an ash discharging opening. The secondary decomposition inner furnace also comprises a supporting plate, a plurality of filtering membrane pipes and a back flushing pipe. The backup pad is fixed in filtering the cavity along filtering the radial of cavity, and the backup pad will filter the cavity and cut apart into two parts, and the part of keeping away from row ash cavity is the cavity, and the part that is close to row ash cavity is cavity down, and goes up the capacity of cavity and be less than the capacity of cavity down, and secondary decomposition gas entry and secondary decomposition gas export are located the relative both sides of cavity down respectively, and secondary decomposition gas export is higher than secondary decomposition gas entry. The plurality of filtering membrane tubes are fixed in the filtering cavity along the axial direction of the filtering cavity, and the filtering membrane tubes are fixed on the supporting plate in a penetrating way. The one end of blowback pipe is located the outside, and the other end is located the epicoele body, and the one end that the blowback pipe is located the cavity is provided with a plurality of blowbacks, and a plurality of blowbacks correspond the intercommunication with many filtration membrane pipes respectively, and the blowback pipe is used for making the intraductal dust of filtration membrane to discharge from the ash discharge mouth. Above-mentioned structure can carry out filtration treatment to the dust in the pyrolysis tail gas, the subsequent purification treatment of being convenient for.
Referring to fig. 2, a second embodiment of a cyanide tailings decyanation system is provided. The cyaniding tailings decyanation system comprises an integrative drying and pyrolysis furnace 21, wherein the integrative drying and pyrolysis furnace 21 comprises a second drying and pyrolysis inner furnace and a second drying and pyrolysis jacket. The second drying pyrolysis inner furnace is used for placing cyanide tailings, and the material inlet and the material outlet are respectively arranged at two axial ends of the second drying pyrolysis inner furnace. The second drying pyrolysis jacket is wrapped on the periphery of the second drying pyrolysis inner furnace and used for containing high-temperature flue gas. The cyanide tailings decyanation system of this embodiment is different from the cyanide tailings decyanation system of the first embodiment in that, in the cyanide tailings decyanation system of this embodiment, a second flue gas inlet is provided at one end of a second drying and pyrolysis jacket close to a material outlet, and a second flue gas outlet is provided at one end of the second drying and pyrolysis jacket close to the material inlet. The structure is simple to process, and the positions of the second flue gas inlet and the second flue gas outlet are arranged, so that the low-temperature section and the high-temperature section form a certain temperature difference, and the temperature requirements of the low-temperature section and the high-temperature section are met.
According to the cyanide tailing decyanation system, low-temperature heating and drying are firstly carried out on cyanide tailings through the low-temperature section of the drying and pyrolysis integrated furnace 21, so that water in the cyanide tailings is changed into water vapor, the weight and the volume of the cyanide tailings are reduced, and high-temperature heating, pyrolysis and decyanation are carried out on the dried cyanide tailings through the high-temperature section of the drying and pyrolysis integrated furnace 21, so that the pyrolysis efficiency is effectively improved, and a heat source is saved.
The working principle of the cyanidation tailing decyanation system of the utility model is as follows:
the first step is as follows: adding cyanide tailings into the drying and pyrolysis integrated furnace 11 from a material inlet, firstly heating and drying the material at a low temperature through a low-temperature section of the drying and pyrolysis integrated furnace 11 to change water in the material into water vapor, discharging the dried water vapor from a second exhaust port, then carrying out high-temperature heating pyrolysis decyanation on the dried cyanide tailings through a high-temperature section of the drying and pyrolysis integrated furnace 11, discharging generated pyrolysis gas from a first exhaust port, and outputting the pyrolysis tailings from a material outlet;
the second step is that: detecting the content of harmful gas in the pyrolysis gas discharged from the first exhaust port by a first gas online detector 13, and detecting the content of harmful gas in the pyrolysis gas discharged from the second exhaust port by a second gas online detector 14, so as to adjust the first atmosphere adjusting valve, so that the mixed gas of nitrogen and oxygen conveyed by the first atmosphere conveying pipeline is in a proper proportion and gas amount;
the third step: the mixed gas discharged from the second gas outlet is condensed by the condenser 151 and then is conveyed to the secondary decomposition tower 152 for dust filtration and secondary pyrolysis, and the mixed gas output from the first gas outlet is conveyed to the secondary decomposition tower 152 for filtration and secondary pyrolysis;
the fourth step: detecting whether the pyrolysis tail gas exhausted by the secondary decomposition tower 152 reaches the standard through a third gas online detector 153, if so, conveying the pyrolysis tail gas to a tail gas purification system 19 for treatment, and if not, returning the pyrolysis tail gas to the secondary decomposition tower 152 for secondary treatment;
the fifth step: the ratio of the mixed gas to be supplied into the secondary decomposition tower 152 is adjusted by the second atmosphere adjusting mechanism 154.
Thus, the working process of the cyanide tailing decyanation system of the preferred embodiment is completed.
According to the cyanide tailing decyanation system, low-temperature heating and drying are firstly carried out on cyanide tailings through the low-temperature section of the drying and pyrolysis integrated furnace 11, so that water in the cyanide tailings is changed into water vapor, the weight and the volume of the cyanide tailings are reduced, and high-temperature heating, pyrolysis and decyanation are carried out on the dried cyanide tailings through the high-temperature section of the drying and pyrolysis integrated furnace 11, so that the pyrolysis efficiency is effectively improved, and a heat source is saved.
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 (10)
1. The utility model provides a cyanide tailings decyanation system for carry out mummification and pyrolysis decyanation to cyanide tailings, a serial communication port, cyanide tailings decyanation system includes the integrative stove of mummification pyrolysis, and its axial both ends are provided with the material import that is used for inputing cyanide tailings respectively and are used for exporting the material export of pyrolysis tailings, the integrative stove of mummification pyrolysis divide into low temperature section and high temperature section, the low temperature section is close to the material import, the low temperature section is used for carrying out the low temperature heating mummification to cyanide tailings, makes the moisture in the cyanide tailings become steam, the high temperature section is close to the material export, the high temperature section is used for carrying out the high temperature heating pyrolysis decyanation to cyanide tailings after the high temperature section is used for.
2. The cyanidation tailings decyanation system of claim 1, wherein the drying and pyrolysis integrated furnace comprises:
the first drying pyrolysis inner furnace is used for placing cyaniding tailings, and the material inlet and the material outlet are respectively arranged at two axial ends of the first drying pyrolysis inner furnace; and the number of the first and second groups,
the first drying pyrolysis jacket wraps the periphery of the inner furnace of the first drying pyrolysis, the first drying pyrolysis jacket is used for containing high-temperature flue gas, a plurality of first flue gas inlets and a first flue gas outlet used for discharging the flue gas are arranged in the outer portion of the first drying pyrolysis jacket along the axial direction of the outer portion of the first drying pyrolysis jacket, the first flue gas inlets are connected with flue gas pipelines used for inputting the high-temperature flue gas, and the first flue gas inlets are multiple electric control valves used for adjusting the gas amount are arranged on the flue gas pipelines.
3. The cyanided tailings decyanation system of claim 2, wherein a partition board is radially arranged in the first drying pyrolysis jacket, the partition board divides the first drying pyrolysis jacket into a drying jacket and a pyrolysis jacket, the drying jacket is close to the material inlet, the drying jacket is used for inputting low-temperature flue gas, the pyrolysis jacket is close to the material outlet, and the pyrolysis jacket is used for inputting high-temperature flue gas.
4. The cyanidation tailings decyanation system of claim 1, wherein the drying and pyrolysis integrated furnace comprises:
the second drying pyrolysis inner furnace is used for placing cyaniding tailings, and the material inlet and the material outlet are respectively arranged at two axial ends of the second drying pyrolysis inner furnace; and the number of the first and second groups,
the second drying pyrolysis jacket wraps the periphery of the second drying pyrolysis inner furnace, the second drying pyrolysis jacket is used for containing high-temperature flue gas, a second flue gas inlet is formed in one end, close to the material outlet, of the second drying pyrolysis jacket, and a second flue gas outlet is formed in one end, close to the material inlet, of the second drying pyrolysis jacket.
5. The cyanidation tailings decyanation system of claim 1, wherein the high temperature section is provided with a first exhaust port for discharging pyrolysis gas generated in the high temperature section; the cyanidation tailings decyanation system further comprises:
the first atmosphere adjusting mechanism comprises a first atmosphere conveying pipeline and a first atmosphere adjusting valve, the first atmosphere conveying pipeline is used for conveying mixed gas of nitrogen and oxygen required during material pyrolysis, the first atmosphere conveying pipeline is located inside the drying and pyrolysis integrated furnace, the first atmosphere adjusting valve is located outside the drying and pyrolysis integrated furnace, and the first atmosphere adjusting valve is used for adjusting the proportion of the mixed gas of the nitrogen and the oxygen conveyed by the first atmosphere conveying pipeline; and the number of the first and second groups,
and the first gas online detector is connected with the first exhaust port and used for detecting the content of harmful gas in the pyrolysis gas exhausted by the first exhaust port so as to adjust the first atmosphere adjusting valve.
6. The cyanidation tailings decyanation system of claim 5, wherein the first atmosphere conveying pipeline extends to the other end along one end of the drying and pyrolysis furnace, and is located at the center of the drying and pyrolysis furnace, and a plurality of uniformly distributed gas outlets for outputting mixed gas of nitrogen and oxygen are arranged on the first atmosphere conveying pipeline.
7. The cyanidation tailings decyanation system of claim 5,
the two axial ends of the drying and pyrolysis integrated furnace are respectively a feeding end and a discharging end, the material inlet is located at the feeding end, the material outlet is located at the discharging end, and the first exhaust port is located at the discharging end;
the feeding end is provided with a second exhaust port for exhausting dried water vapor generated by the low-temperature section and pyrolysis gas generated by the high-temperature section;
the cyaniding tailings decyanation system further comprises a second gas online detector which is connected with the second exhaust port and used for detecting the content of harmful gas in pyrolysis gas exhausted from the second exhaust port, so that the first atmosphere regulating valve is regulated.
8. The cyanidation tailings decyanation system of claim 7, further comprising a secondary decomposition mechanism, the secondary decomposition mechanism comprising:
the condenser comprises a condensation inlet and a condensation outlet, the condensation inlet is connected with the second exhaust port, the condenser is used for condensing the dried water vapor discharged from the second exhaust port, and the condensation outlet is used for discharging non-condensable gas; and the number of the first and second groups,
the secondary decomposition tower is used for heating and pyrolyzing the pyrolysis gas discharged by the drying and pyrolysis integrated furnace again, the secondary decomposition tower comprises a secondary decomposition inner furnace and a secondary decomposition jacket, the secondary decomposition inner furnace comprises two secondary decomposition gas inlets and a secondary decomposition gas outlet, one secondary decomposition gas inlet is connected with the condensation outlet, the other secondary decomposition gas inlet is connected with the first exhaust port, and the secondary decomposition gas outlet is used for discharging pyrolysis tail gas generated by the secondary decomposition tower; the secondary decomposition jacket is wrapped on the periphery of the secondary decomposition inner furnace and used for containing high-temperature flue gas.
9. The cyanidation tailings decyanation system of claim 8, further comprising:
an input port of the tail gas main pipeline is connected with the secondary decomposed gas outlet, and the tail gas main pipeline is used for conveying the pyrolysis tail gas exhausted from the secondary decomposed gas outlet;
an input port of the purification pipeline is connected with an output port of the tail gas main pipeline, and the purification pipeline is provided with an electric control valve for turning off and on;
an input port of the return pipeline is connected with an output port of the main tail gas pipeline, an output port of the return pipeline is connected with the secondary decomposed gas inlet, and the return pipeline is provided with an electric control valve for turning off and on;
the tail gas purification system is connected with the output port of the purification pipeline and is used for purifying the output pyrolysis tail gas;
the secondary decomposition mechanism further comprises:
the third gas online detector is arranged on the tail gas main pipeline and is used for detecting the content of harmful gas in the pyrolysis tail gas conveyed by the tail gas main pipeline, when the harmful gas in the pyrolysis tail gas is detected to be lower than a set requirement, the pyrolysis tail gas is conveyed to the tail gas purification system through the purification pipeline for treatment, and when the harmful gas in the pyrolysis tail gas is detected to be higher than the set requirement, the pyrolysis tail gas is conveyed to the secondary decomposition tower through the backflow pipeline for secondary treatment; and the number of the first and second groups,
and the second atmosphere adjusting mechanism comprises a second atmosphere conveying pipeline and a second atmosphere adjusting valve, the second atmosphere conveying pipeline is used for conveying mixed gas required during secondary decomposition, the second atmosphere conveying pipeline is positioned in the secondary decomposition inner furnace, the second atmosphere adjusting valve is positioned outside the secondary decomposition tower, and the second atmosphere adjusting valve is used for adjusting the proportion of the mixed gas conveyed by the second atmosphere conveying pipeline.
10. The cyanide tailing decyanation system of claim 8, wherein the secondary decomposition inner furnace is divided into an upper filtering cavity and a lower ash discharge cavity, the ash discharge cavity is conical, and the bottom of the ash discharge cavity is provided with an ash discharge port; the secondary decomposition inner furnace further comprises:
the support plate is fixed in the filter cavity along the radial direction of the filter cavity, the support plate divides the filter cavity into two parts, the part far away from the ash discharge cavity is an upper cavity, the part close to the ash discharge cavity is a lower cavity, the capacity of the upper cavity is smaller than that of the lower cavity, the secondary decomposition gas inlet and the secondary decomposition gas outlet are respectively positioned at two opposite sides of the lower cavity, and the secondary decomposition gas outlet is higher than the secondary decomposition gas inlet;
the filtering membrane tubes are fixed in the filtering cavity along the axial direction of the filtering cavity, and penetrate and are fixed on the supporting plate; and the number of the first and second groups,
the blowback pipe, the one end of blowback pipe is located the outside, and the other end is located go up the cavity, the blowback pipe is located the one end of going up the cavity is provided with a plurality of blowbacks, and is a plurality of the blowback is respectively with many the filtration membrane pipe corresponds the intercommunication, the blowback pipe is used for making the intraductal dust of filtration membrane is followed arrange the ash hole and discharges.
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| CN114713591A (en) * | 2022-03-30 | 2022-07-08 | 山东黄金矿业科技有限公司选冶实验室分公司 | Pyrolysis harmless treatment method for sulfur-containing cyaniding leaching tailings |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114713591A (en) * | 2022-03-30 | 2022-07-08 | 山东黄金矿业科技有限公司选冶实验室分公司 | Pyrolysis harmless treatment method for sulfur-containing cyaniding leaching tailings |
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