CN102068784A - Method for chromium residue detoxification of pot calciner at high temperature - Google Patents
Method for chromium residue detoxification of pot calciner at high temperature Download PDFInfo
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- CN102068784A CN102068784A CN2009102200001A CN200910220000A CN102068784A CN 102068784 A CN102068784 A CN 102068784A CN 2009102200001 A CN2009102200001 A CN 2009102200001A CN 200910220000 A CN200910220000 A CN 200910220000A CN 102068784 A CN102068784 A CN 102068784A
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- coke
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Abstract
The invention discloses a method for chromium residue detoxification of a pot calciner at a high temperature, which belongs to the technical field of metallurgy, chemical industry and raw material thermal processing. In the method for the chromium residue detoxification of the pot calciner at the high temperature, a mixture of calcined coke or other coke and a chromium residue is detoxificated by performing a reduction reaction by utilizing the pot calciner which is commonly used in carbon industry at the temperature of 500 to 1,300 DEG C. The method has the characteristics that: the mixture does not need to be balled, thermal regulation and detoxification quality can be controlled, and ring-forming is not easy cause in the pot calciner in the reaction. Generally, a purification device does not need to be configured for flue gas after the pot calciner by the method; and the process method saves investment and simplifies a detoxification process.
Description
Technical field
The present invention relates to a kind of can-type calcine furnace method of chromium residue detoxifying at high temperature, belong to metallurgy, chemical industry, reach the raw material technical field of hot working.
Background technology
Metallurgy, chemical industry, and the chromium salt production of raw material hot-working industry in, produce a certain amount of chromium slag.Hexavalent chromium compound in the chromium slag is harmful to people and animals, does not easily cause serious environmental to pollute if do not administer.Under the condition of high temperature, carbon can make hexavalent chrome reduction poisonous in the chromium slag become nontoxic trivalent chromium with carbon monoxide.
At present, the equipment that high-temperature detoxification Cr VI slag uses is mainly cement vertical furnace and rotary kiln, and the main reduction raw material that uses is coal.Because the thermal response of detoxifcation is reversible in the atmosphere of oxidation, so this Cr VI is become chromic reaction must be to carry out in the reducing atmosphere of high temperature.And reducing atmosphere is under this high temperature: 1, the chromium slag fully contacts with the carbon raw material.2, imperfect combustion.These two kinds of reducing atmospheres exist simultaneously in the chromium residue detoxifying process of vertical furnace, rotary kiln.And the coal amount in other similar devices such as vertical furnace, rotary kiln of making of imperfect combustion wherein too much produces the flue gas of a large amount of contaminated environment of being made up of fugitive constituent and carbon monoxide etc.These equipment in use need be equipped with very jumbo cleaning equipment.Therefore increase fund input, improved engineering cost.
The two has different shortcomings to carry out chromium residue detoxifying with cement vertical furnace or rotary kiln:
The cement vertical furnace: coal and chromium slag and clay add water balling-up in nodulizer behind the ball milling in proportion and enter in the kiln again, and coal and chromium slag and clay all must be dry.If heat also will replenish coal-fired inadequately in kiln.Because of reasons such as volatile matter cokings, kiln is material ring formation and influence production on the kiln wall sometimes in detoxification processes, and cleaning needs the blowing out cooling, implements pretty troublesome.Because in the kiln is imperfect combustion, need the large-scale gas cleaning of configuration behind the vertical furnace.
Rotary kiln: the wayward influence detoxifcation of each section reducing atmosphere quality in the kiln of rotation.Contrast vertical furnace exhaust gas volumn also wants big, needs to increase the load of cleaning system.
Yet there are no the method that adopts can-type calcine furnace at high temperature to carry out chromium residue detoxifying discloses.
Summary of the invention
The present invention is exactly in order to solve the problems of the technologies described above, and provide a kind of can-type calcine furnace method of chromium residue detoxifying at high temperature, it has solved the problem that the fugitive constituent incomplete combustion wastes energy, also solved simultaneously the fugitive constituent problem of environment pollution caused, do not need to be equipped with very jumbo cleaning equipment, reduced engineering cost.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solution:
A kind of can-type calcine furnace is the method for chromium residue detoxifying at high temperature, utilizes can-type calcine furnace that the carbon element industry generally uses under 500-1300 ℃ high temperature the mixture of calcined coke or other coke and chromium slag to be carried out reduction reaction and detoxifies.
The described mixture that utilizes calcined coke or other coke and chromium slag carries out reduction reaction and detoxifies, be earlier calcined coke or other coke to be mixed with the chromium slag of oven dry, utilize ball milling or disintegrating machine that mixture is processed into the material of powder, small grain size then, the material that processes is joined in the can-type calcine furnace detoxify again.
Being about by volume of described calcined coke or other coke and chromium slag: 15-30: 100.
Described calcined coke is burnt petroleum coke, and other coke is the metallurgical coke class of oven dry.
The required heat of reaction of mixed material in the described can-type calcine furnace is that the heat that the fugitive constituent by coal gas or natural gas or heavy oil or bituminous coal is generated after pot type burner quirk internal combustion transmits to mixed material by tank skin again.
Advantage of the present invention and effect are as follows:
1, the poisonous chromium slag that can handle in the Chemical Manufacture continuously to be produced;
2, to mixed material without balling-up, simplified technology, reduced equipment;
3, can control the quality of chromium residue detoxifying;
4, use the can-type calcine furnace detoxification chromium slag not produce or seldom produce pernicious gas, therefore generally need not dispose cleaning equipment the flue gas that it produced.
5, utilizing can ring formation in this technology retort.
6, owing to having simplified technology, having reduced equipment and need not dispose cleaning equipment and reduce investment.
The specific embodiment
Below the invention will be further described for the description by the specific embodiment, but this is not to be limitation of the present invention, those skilled in the art are according to basic thought of the present invention, can make various modifications or improvement, but only otherwise break away from basic thought of the present invention, all within the scope of the present invention.
A kind of can-type calcine furnace of the present invention is the method for chromium residue detoxifying at high temperature: the can-type calcine furnace that utilizes the carbon element industry generally to use carries out reduction reaction to the mixture of calcined coke and chromium slag under 500-1300 ℃ high temperature, to reach the purpose of detoxifcation.The can-type calcine furnace at high temperature specific embodiment of the method for chromium residue detoxifying is: the metallurgical coke class with burnt petroleum coke or oven dry is about 15-30 by volume earlier: 100 ratio is mixed with the chromium slag of oven dry, carry out the mixture that ball milling or disintegrating machine are processed into small grain size, powder then, the granularity of mixture is less than 50mm, and mixture feeds in raw material to can-type calcine furnace by a series of transportation, lifting, feeding device.Because can-type calcine furnace has indirect and the material that heats is had sealing, the powder material that high temperature mixes down reacts by following formula in retort, mainly based on carbon reduction:
2C+O
2→2CO↑ (1)
2Na
2CrO
4+3CO→2NaCrO
2+Na
2CO
3+2CO
2↑ (2)
2CaCrO
4+3CO→CaCr
2O
4+CaO+3CO
2↑ (3)
4Na
2CrO
4+3C→4NaCrO
2+2Na
2CO
3+2CO
2↑ (4)
4CaCrO
4+3C→2CaCr
2O
4+2CaO+3CO
2↑ (5)
The required heat of reaction of mixed material in the retort is that the heat that the fugitive constituent (if participating in part bituminous coal in the mixture) by coal gas or natural gas or heavy oil or bituminous coal is generated after pot type burner quirk internal combustion transmits to mixed material by tank skin again.
Quality for material detoxifcation chemical reaction can be regulated by discharge velocity.This is a common process, is not described in detail.
In reaction, produce unnecessary gases such as carbon monoxide for material and can enter quirk further burning and purification.
Claims (5)
1. the can-type calcine furnace method of chromium residue detoxifying at high temperature is characterised in that utilizing can-type calcine furnace that the carbon element industry generally uses under 500-1300 ℃ high temperature the mixture of calcined coke or other coke and chromium slag to be carried out reduction reaction detoxifies.
2. can-type calcine furnace according to claim 1 is the method for chromium residue detoxifying at high temperature, it is characterized in that described calcined coke or other coke and the mixture of chromium slag are carried out that reduction reaction detoxifies is earlier calcined coke or other coke to be mixed with the chromium slag of oven dry, utilize ball milling or disintegrating machine that mixture is processed into the material of powder, small grain size then, the material that processes is joined in the can-type calcine furnace detoxify again.
3. can-type calcine furnace according to claim 1 is the method for chromium residue detoxifying at high temperature, it is characterized in that the volumetric mixture ratio of described calcined coke or other coke and chromium slag is: 15-30: 100.
4. can-type calcine furnace according to claim 1 is the method for chromium residue detoxifying at high temperature, it is characterized in that described calcined coke is burnt petroleum coke, and other coke is the metallurgical coke class of oven dry.
5. can-type calcine furnace according to claim 1 is the method for chromium residue detoxifying at high temperature, it is characterized in that the required heat of reaction of mixed material in the can-type calcine furnace, is that the heat that the fugitive constituent by coal gas or natural gas or heavy oil or bituminous coal is generated after pot type burner quirk internal combustion transmits to compound by tank skin again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102200001A CN102068784A (en) | 2009-11-19 | 2009-11-19 | Method for chromium residue detoxification of pot calciner at high temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102200001A CN102068784A (en) | 2009-11-19 | 2009-11-19 | Method for chromium residue detoxification of pot calciner at high temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102068784A true CN102068784A (en) | 2011-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102200001A Pending CN102068784A (en) | 2009-11-19 | 2009-11-19 | Method for chromium residue detoxification of pot calciner at high temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102068784A (en) |
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2009
- 2009-11-19 CN CN2009102200001A patent/CN102068784A/en active Pending
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Application publication date: 20110525 |