CN101376052A - Dry method detoxication technique for high-temperature calcination of 11-15% chromic slag at 900 +/- 100 DEG C in vertical kiln - Google Patents
Dry method detoxication technique for high-temperature calcination of 11-15% chromic slag at 900 +/- 100 DEG C in vertical kiln Download PDFInfo
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- CN101376052A CN101376052A CNA2007100592803A CN200710059280A CN101376052A CN 101376052 A CN101376052 A CN 101376052A CN A2007100592803 A CNA2007100592803 A CN A2007100592803A CN 200710059280 A CN200710059280 A CN 200710059280A CN 101376052 A CN101376052 A CN 101376052A
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- chromium slag
- chromium
- slag
- shaft kiln
- hexavalent chrome
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Abstract
The invention belongs to the technology of the treatment and the comprehensive utilization of chromic slag. The matching ratio of chromic slag, coal and clay ranges from 11 to 15 percent, and the process of even mixture, milling, spherulization and calcination is adopted; hexavalent chrome is deoxidized into trivalent chromium by using carbon monoxide at the temperature of 900 DEG C in a vertical kiln, thereby achieving the purpose of detoxification; sintering materials can be comprehensively utilized without generating secondary pollution; and the technology also has the advantages of high speed of treatment, low cost and low construction cost.
Description
Technical field
The invention belongs to the improvement and the comprehensive utilization technique of chromium slag, particularly utilize mechanical shaft kiln high-temperature to administer chromic technology in the chromium slag, with chromium slag and coal, clay proportioning 11-15%; All mix, abrasive dust, balling-up, calcining, utilize that 900 ℃ of environment of high temperature and carbon monoxide make hexavalent chrome reduction be trivalent chromium in the shaft kiln, and then reach the purpose of detoxifcation, burn till material and can realize comprehensive utilization, do not produce secondary pollution, improvement speed is fast, expense is low, reduces construction costs.
Background technology
Because it is big that a large amount of chromium slags that traditional chromic salts industry discharged lack the improvement amount, expense is low, and the improvement method of non-secondary pollution causes the chromium slag that environment is caused severe contamination, has restricted the development of chromic salts industry to a great extent even is forced to stop production.900 ℃ ± 100 ℃ high-temperature dry detoxified existing reports of shaft kiln.The existing millions of tons of chromium slag that the present invention has accumulated with 900 ℃ of present China of temperature of shaft kiln calcination clinker, and still with annual ten tens thousand of tons speed increase.The high-temperature dry detoxified improvement method of chromium slag has multiple: disintoxication, be meant and utilize 900 ℃ of high temperature, reduzate and acid condition are nontoxic trivalent chromium with the hexavalent chrome reduction in the chromium slag, and the present invention realizes resource, through engineering approaches with shaft kiln calcination clinker process conditions chromium slag, particularly break through the expense height, improvement speed is slow, realizes social benefit, environmental benefit, economic benefit is obvious, is task of the present invention.
Summary of the invention
The present invention is the method for administering the chromium slag with the reducing atmosphere that 900 ℃ of high temperature of shaft kiln calcination clinker and dying fire operation produce, the chromium slag that environment is worked the mischief all is converted into the cement mineralizing agent, cement mixture, all kinds of construction material, the engineering that do not cause secondary pollution uses engineering soil, backfill soil or steel-making ironmaking sintering feed.The present invention is the utilization that the high temperature reduction and detoxication method that generally adopts is improved formation both at home and abroad
The method of shaft kiln high-temperature calcination chrome slag dry detoxified chromium slag.
The present invention gives the effect that shaft kiln has 900 ℃ of high temperature, carbon monoxide reduction and detoxication, with 11-15% chromium slag and coal, clay all mix, abrasive dust, balling-up, the chromium slag under the operation of the dark dying fire of shaft kiln through preheating zone, high temperate zone, make that hexavalent chrome reduction is a trivalent chromium in the chromium slag, and be fixed in the molten mass, enter salband and put and burn till that the material exit is cooled off rapidly or the water under high pressure anti-oxidation of shrend rapidly, key reaction is as follows: under alkali condition during greater than 500 ℃: CrO
3+ 3/2O
2=2CrO
3, at 700～800 ℃, shrend produces hydrogen and carbon monoxide: C+H
2O=H
2+ CO stops chromic diffuse pollution in the chromium slag; Utilize shaft kiln high-temperature and carbon monoxide reduction with 900 ℃ of high temperature in Cr VI and the kiln in the chromium slag and carbon monoxide environment, be reduced to nontoxic trivalent chromium, and generate more stable complex compound, the chromium slag is detoxified.This method utilizes shaft kiln high-temperature to administer the chromium slag in a large number, the essence of its engineering construction is to form the technology that can purify simple in structure, on the one hand treatment of chromate slag is not afraid of and is scattered, run off, the permanent material of infiltration, create conditions again on the other hand and make full use of the character of the physical mechanics that burns till material, but making cement mineralizer, cement mixture, and all kinds of construction timbers and engineering soil and steel-making ironmaking just make treatment of chromate slag realize its comprehensive utilization of resources with sintering feed.
Dry detoxified being meant of 900 ℃ of high temperature reductions of indication of the present invention contains 900 ℃ of shaft kiln high-temperatures, carbon monoxide reduction mechanism, through calcining in about six hours the reducing substances environment is arranged, carbon monoxide contains and 900 ℃ high temperature and the calcinations and sintering material about six hours in the shaft kiln〉during 500 ℃ of dischargings, cooling (shrend is better) has strong reduction and detoxication effect to Cr VI in the chromium slag rapidly.
It is a kind of 900 ℃ of high temperature, carbon monoxide condition utilized that the present invention utilizes the idle dry detoxified method of machine vertical kiln special calcination chrome slag in cement plant; Being to adopt high-temperature detoxification, the comprehensive utilization technique of technology after improving of administering chromium slag maturation both at home and abroad, is a safe non-secondary pollution, economic benefit, and social benefit, environmental benefit significantly fully utilize the technology of chromium slag.
Description of drawings
Accompanying drawing is the structural representation of this method
The specific embodiment
Below in conjunction with accompanying drawing this method is further described
Embodiment 1
Press the engineering schematic diagram of Fig. 1, broken being placed in the dryer of chromium ground-slag dried, enter respectively through batch weigher and coal, clay then.Raw grinding, enter the homogenizing storehouse, again through elevator, add water, balling-up in advance, going into shaft kiln high-temperature burns till, at shaft kiln through preheating zone, 900 ℃ of high temperate zones, salband, the time (see figure 2) is 900 ℃ of high temperature about six hours, burn till material in the carbon monoxide environment, cool off rapidly at 500 o'clock ℃ of waters and can meet among the GB5085.3-1996 " national hazardous waste judging standard " relevant chromic regulation Zhi Shuo ≦ 1.5mg/L and become cement mineralizing agent, cement mixture, all kinds of construction material, engineering soil and steel-making and smelt iron with burning till piece by the material that burns till of shaft kiln discharging outlet.
Claims (4)
1, a kind of the chromium slag is used for the high temperature of 900 ℃ of machine shaft kilns, carbon monoxide is to hexavalent chrome reduction mechanism in the chromium slag, the detoxication technique of formation; Burning till material after the detoxifcation is: utilize 900 ℃ of high temperature of machine shaft kiln, carbon monoxide reducing condition, vast scale (the chromium slag more than 50%) makes that hexavalent chrome reduction is a trivalent chromium in the chromium slag, and expense is low, and speed is fast, has economic benefit; Can not produce secondary pollution; The chromium slag enters 900 ℃ in high temperate zone through the preheating zone under the operation of the dark dying fire of machine shaft kiln, make that hexavalent chrome reduction is a trivalent chromium in the chromium slag, after entering salband, put and burn till the material exit 500 ℃ ± 50 ℃ cooling or water under high pressure anti-oxidation of shrend rapidly rapidly, and then generate stable chromium slag and burn till material, form the technology that safe non-secondary pollution economy, society, an environmental benefit significantly fully utilize the chromium slag.
2, under 900 ℃ of claim " 1 " high temperature zone temperatures, high-temperature calcination makes hexavalent chrome reduction under reducing atmosphere be trivalent chromium.
3, the preheating zone in claim " 1 " and " 2 " machine shaft kiln is 900 ℃, 900 ℃ in high temperate zone, 500 ℃ ± 100 ℃ of salbands; Cr VI in the chromium slag there is strong reduction, detoxifies and prevents oxidation.
4, the ratio of chromium slag and coal, clay in the claim " 1-3 ", should control the chromium slag at 11-15: 15: 74-70 is best.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100592803A CN101376052A (en) | 2007-08-27 | 2007-08-27 | Dry method detoxication technique for high-temperature calcination of 11-15% chromic slag at 900 +/- 100 DEG C in vertical kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100592803A CN101376052A (en) | 2007-08-27 | 2007-08-27 | Dry method detoxication technique for high-temperature calcination of 11-15% chromic slag at 900 +/- 100 DEG C in vertical kiln |
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|---|---|
| CN101376052A true CN101376052A (en) | 2009-03-04 |
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|---|---|---|---|
| CNA2007100592803A Pending CN101376052A (en) | 2007-08-27 | 2007-08-27 | Dry method detoxication technique for high-temperature calcination of 11-15% chromic slag at 900 +/- 100 DEG C in vertical kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114288604A (en) * | 2021-12-29 | 2022-04-08 | 湖北振华化学股份有限公司 | Harmless and recycling treatment method for chromium slag |
-
2007
- 2007-08-27 CN CNA2007100592803A patent/CN101376052A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114288604A (en) * | 2021-12-29 | 2022-04-08 | 湖北振华化学股份有限公司 | Harmless and recycling treatment method for chromium slag |
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Open date: 20090304 |