CN102489490B - Harmless treatment method of arsenic-containing waste residue - Google Patents
Harmless treatment method of arsenic-containing waste residue Download PDFInfo
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- CN102489490B CN102489490B CN2011103993807A CN201110399380A CN102489490B CN 102489490 B CN102489490 B CN 102489490B CN 2011103993807 A CN2011103993807 A CN 2011103993807A CN 201110399380 A CN201110399380 A CN 201110399380A CN 102489490 B CN102489490 B CN 102489490B
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Abstract
The invention provides a harmless treatment method of arsenic-containing waste residue. The method comprises the following steps: 1) feeding: feeding the waste residue into a calcining device through a conveying and feeding device; 2) calcining: heating and roasting the waste residue to high temperature in the calcining device, and then sending the waste residue into a heat insulation device; 3) performing heat insulation: performing heat insulation on the hot waste residue at the constant temperature for a certain period of time in the heat insulation device, and then sending the waste residue into a cooling device; 4) cooling: cooling a waste residue material till the discharge temperature in the cooling device and pre-heating normal-temperature air; and 5) discharging: discharging the waste residue material after treatment. The method disclosed by the invention has the following technical effects: separately performing calcination, heat insulation and cooling, facilitating detection and control of various system process temperatures and being easy to control heat insulation time and treatment capacity. The method further has the characteristics of simple process, low treatment cost, great treatment capacity, strong production continuity, convenience and easiness in operation and control and the like.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to the method for arsenic-containing waste residue harmless treatment.
Background technology
Arsenic, as the indicator element of rare metal, is accompanied by rare metal and is exploited in a large number.China produces approximately 50,000 tons of arsenic-containing waste residues per year, yet a large amount of arsenic slags obtains suitable processing, does not dispose, and the outdoor amount of hoarding surpasses 300,000 tons at present, has produced serious environmental problem.
The method of processing at present arsenic-containing waste residue can be divided into three kinds: a kind of is solidification method, and solidification method is by physics, chemical method, arsenic-containing waste residue to be fixed or is included in inert solid matrix, makes it to present a kind of method for innocent treatment of chemical stability or sealing; Another kind is wet method, adopts acidleach, alkali to soak or salt soaks etc. and to be processed, and first arsenic is separated from slag, and then is further reclaimed the arsenic product or carry out harmless treatment; The third is pyrogenic process, arsenic-containing waste residue is carried out to high-temperature calcination, and the temperature of calcining is higher, and the arsenic slag solubility after calcining is just lower.External several copper smelting plants just adopted pyrogenic process when processing the arsenic waste residue in recent years, and had obtained better effects.Domestic also have several families to adopt the high temperature pyrogenic process to processing the arsenic-containing waste residue produced in the high smaltite process, also obtained good effect.
Solidification method with its anti-exudative good, corrosion resistance is strong, the intensity of firming body, heat resistance, good endurance and in industrial extensive use, but complex process, equipment material requires high, processing cost is high, if production process is controlled bad secondary pollution and the safety problem that very easily causes environment.
Wet method has low energy consumption, of low pollution, efficiency advantages of higher, but the flow process complexity, processing cost is higher.
Pyrogenic process has that technique is simple, treating capacity is large, pollute the advantages such as little, but pyrogenic process requires after the arsenic-containing waste residue calcining to be incubated certain hour under steady temperature, carries out cooling processing again.At present adopting the method for pyrogenic attack arsenic-containing waste residue is first waste residue to be put in calcining furnace and calcined, and in the waste residue shift-in holding furnace after then manually calcining, complicated operation, labour intensity are large; Because the time of needs insulation is long, calcination time is short, therefore a plurality of holding furnaces will be set to meet need of production, and equipment cost is high; And thermal loss is large in the process that shifts the calcining waste residue, energy consumption is high, and continuous production is poor.
Summary of the invention
The object of the invention is to overcome above-mentioned shortcoming and provide that a kind of technique is simple, processing cost is low, treating capacity is large, continuous production is strong and convenient operation and control is easy to the method for arsenic-containing waste residue harmless treatment.
The method of arsenic-containing waste residue harmless treatment of the present invention comprises the following steps:
1) charging: waste residue is fed to calciner by conveying, drawing-in device;
2) roasting: in calciner by the waste residue heating and calcining to high temperature, then send into attemperator;
3) insulation: in attemperator, by hot waste residue constant temperature insulation certain hour, then send into cooling device;
4) cooling: in cooling device, the waste residue material is cooled to exhaust temperature, and the preheating normal temperature air;
5) discharge: the waste residue material after processing is discharged.
Preferably,
Said calciner is calcining kiln.
Said attemperator is the insulation kiln.
Said cooling device is cooling kiln.
The method of arsenic-containing waste residue harmless treatment of the present invention, comprise the steps:
1) waste residue is through feeding hopper artificial or loading machine feeding elevator below, and elevator enters the screw feeder parallel operation by the waste residue lifting and quantitatively feeds calcining kiln, and under the calcining kiln turning effort, waste residue moves from calcining kiln kiln Caudad kiln hood, from normal temperature, is heated to high temperature;
2) the high temperature waste residue is discharged into the calcining kiln kiln head cover from calcining kiln, and the chute below the calcining kiln kiln head cover enters the insulation kiln and be incubated, and under insulation kiln turning effort, waste residue moves from insulation kiln kiln Caudad kiln hood;
3) chute after the high temperature waste residue stops certain hour in the insulation kiln below insulation kiln kiln head cover enters cooling kiln and carries out cooling, chute has lock wind discharge valve, and under the effect of cooling kiln revolving force, waste residue moves from cooling kiln kiln Caudad kiln hood, be cooled to 100 ℃ in movement, be discharged from outside kiln;
In this process, normal temperature air enters cooling kiln from the cooling kiln kiln hood, with the high temperature waste residue, carry out becoming hot-air after heat exchange, hot-air enters cooling kiln kiln hood from cooling kiln, between cooling kiln kiln hood and calcining kiln kiln head cover, hot-air duct is arranged, combustion gas and hot-air are in the calcining kiln internal combustion, after waste residue is heated to high temperature, flue gas after burning enters calcining kiln kiln hood, then after pipeline enters blower fan by smoke stack emission.
The method of arsenic-containing waste residue harmless treatment of the present invention has following technique effect:
1) hot-air that the cooling kiln heat exchange produces directly enters calcining kiln for burning, and hot-air, without the insulation kiln, does not affect insulation kiln heat insulation effect.
2) calcining kiln, insulation kiln and cooling kiln all can be adjusted separately kiln body rotating speed, and convenient operation and control is easy, can link and control time and the waste residue treating capacity of roasting, insulation and cooling needs, thereby guarantee sintering temperature, temperature retention time and cooling effect.
3) system arranges the tail exhaust blower, the omnidistance negative-pressure operation of system, and in flow process, without gas, dust leakage, workman's operating environment is better.
4) each kiln kiln tail (feed end) all arranges the kiln hood, and subsidiary weight valve, and abnormal condition underflow stream waste residue can be discharged automatically, extends the seal life of each kiln.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is technological process block-diagram of the present invention.
Fig. 2 is the system and device schematic diagram of embodiments of the invention.
Wherein, 1 is feeding hopper, and 2 is elevator, 3 is screw feeder, and 4 is calcining kiln, and 5 is the calcining kiln kiln head cover, 6 is chute, and 7 is the insulation kiln, and 8 is insulation kiln kiln head cover, 9 is chute, and 10 is lock wind discharge valve, and 11 is cooling kiln, 12 is cooling kiln kiln hood, and 13 is calcining kiln kiln hood, and 14 is blower fan, 15 is chimney, and 16 is hot-air duct, and 17 is pipeline.
The specific embodiment
Embodiment 1
Take certain hazardous waste center that centrally disposes be to process object containing the arsenic minerals slag, this slag yellowly mud shape, and in slag, arsenic content is 5%.
As shown in Figure 1-2, the method for the arsenic-containing waste residue harmless treatment of the present embodiment comprises the steps:
Waste residue feeds the feeding hopper 1 of elevator below through artificial or loading machine, elevator 2 promotes waste residue to enter screw feeder 3 and quantitatively feed calcining kiln 4.Under calcining kiln 4 turning efforts, waste residue moves from calcining kiln 4 kiln Caudad kiln hoods, is heated to 730 ℃ from normal temperature.The high temperature waste residue is discharged into calcining kiln kiln head cover 5 from calcining kiln 4, and the chute below calcining kiln kiln head cover 56 enter the insulation kiln 7 be incubated (650 ℃).Under 7 turning efforts of insulation kiln, waste residue moves from insulation kiln 7 kiln Caudad kiln hoods.High temperature waste residue (650 ℃) chute 9 below insulation kiln kiln head cover 8 after the insulation interior stop certain hour of kiln 7 (approximately 1 hour) enters cooling kiln 11 and carries out cooling.Chute 9 has lock wind discharge valve 10.Under cooling kiln 11 revolving force effects, waste residue moves from cooling kiln 11 kiln Caudad kiln hoods, is cooled to 100 ℃ in movement, is discharged from outside kiln.
In this process, normal temperature air enters cooling kiln 11 from cooling kiln 11 kiln hoods (deslagging end), with high temperature waste residue (650 ℃), carries out becoming hot-air (300 ℃) after heat exchange, and hot-air enters cooling kiln kiln hood 12 from cooling kiln 11.Between cooling kiln kiln hood 12 and calcining kiln kiln head cover 5, hot-air duct 16 is arranged.Combustion gas and hot-air, in calcining kiln 4 internal combustion, are heated to 730 ℃ by waste residue.Flue gas after burning enters calcining kiln kiln hood 13, then by chimney 15, discharges after pipeline 17 enters blower fan 14.
Claims (1)
1. the method for an arsenic-containing waste residue harmless treatment, is characterized in that, comprises the following steps:
(1) charging: waste residue feeds the feeding hopper of elevator below through artificial or loading machine, and elevator promotes waste residue to enter screw feeder and quantitatively feed calcining kiln;
(2) roasting: under the calcining kiln turning effort, waste residue moves from calcining kiln kiln Caudad kiln hood, from normal temperature, is heated to high temperature, and the high temperature waste residue is discharged into the calcining kiln kiln head cover from calcining kiln, and the chute below the calcining kiln kiln head cover enters the insulation kiln;
(3) insulation: under the turning effort of insulation kiln, waste residue moves from insulation kiln kiln Caudad kiln hood, and the chute after the high temperature waste residue stops certain hour in the insulation kiln below insulation kiln kiln head cover enters cooling kiln, and chute has lock wind discharge valve;
(4) cooling: under the effect of cooling kiln revolving force, waste residue moves from cooling kiln kiln Caudad kiln hood, is cooled to 100 ° of C in movement, is discharged from outside kiln;
In this process, normal temperature air enters cooling kiln from the cooling kiln kiln hood, with the high temperature waste residue, carry out becoming hot-air after heat exchange, hot-air enters cooling kiln kiln hood from cooling kiln, between cooling kiln kiln hood and calcining kiln kiln head cover, hot-air duct is arranged, combustion gas and hot-air are in the calcining kiln internal combustion, after waste residue is heated to high temperature, flue gas after burning enters calcining kiln kiln hood, then after pipeline enters blower fan by smoke stack emission.
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| CN2011103993807A CN102489490B (en) | 2011-12-06 | 2011-12-06 | Harmless treatment method of arsenic-containing waste residue |
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| CN2011103993807A CN102489490B (en) | 2011-12-06 | 2011-12-06 | Harmless treatment method of arsenic-containing waste residue |
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| CN102489490A CN102489490A (en) | 2012-06-13 |
| CN102489490B true CN102489490B (en) | 2013-12-04 |
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| CN109022801B (en) * | 2018-08-31 | 2023-08-18 | 兰州有色冶金设计研究院有限公司 | Device and method for innocent treatment of arsenic sulfide slag |
Citations (5)
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|---|---|---|---|---|
| WO2000066286A1 (en) * | 1999-04-30 | 2000-11-09 | Rilekan Oy | Recovery of heavy metals in waste treatment |
| CN1490420A (en) * | 2002-10-17 | 2004-04-21 | �����λ���ҵ�����������ι�˾ | Vacuum arsenic extracting method and system without pollution |
| CN101984319A (en) * | 2010-12-08 | 2011-03-09 | 鞍山市华杰建材技术开发有限公司 | Energy-saving and efficiency-improvement double-temperature-field rotary kiln system |
| CN201819540U (en) * | 2010-09-21 | 2011-05-04 | 吉林吉恩镍业股份有限公司 | Fixed temperature-regulating kiln of multi-section high temperature reduction rotary kiln |
| CN102061389A (en) * | 2010-11-15 | 2011-05-18 | 武汉工程大学 | Method for recycling arsenium and enriching heavy metals in arsenium-containing metallurgical sludge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5547870B2 (en) * | 2008-03-25 | 2014-07-16 | 大陽日酸株式会社 | Method for recovering metal arsenic |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000066286A1 (en) * | 1999-04-30 | 2000-11-09 | Rilekan Oy | Recovery of heavy metals in waste treatment |
| CN1490420A (en) * | 2002-10-17 | 2004-04-21 | �����λ���ҵ�����������ι�˾ | Vacuum arsenic extracting method and system without pollution |
| CN201819540U (en) * | 2010-09-21 | 2011-05-04 | 吉林吉恩镍业股份有限公司 | Fixed temperature-regulating kiln of multi-section high temperature reduction rotary kiln |
| CN102061389A (en) * | 2010-11-15 | 2011-05-18 | 武汉工程大学 | Method for recycling arsenium and enriching heavy metals in arsenium-containing metallurgical sludge |
| CN101984319A (en) * | 2010-12-08 | 2011-03-09 | 鞍山市华杰建材技术开发有限公司 | Energy-saving and efficiency-improvement double-temperature-field rotary kiln system |
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