CN101468889A - High-temperature calcination technology for 10-20% chromic slag and 60-70% alkaline residue gypsum plate under 1350 DEG C +/- 100 DEG C in vertical kiln - Google Patents
High-temperature calcination technology for 10-20% chromic slag and 60-70% alkaline residue gypsum plate under 1350 DEG C +/- 100 DEG C in vertical kiln Download PDFInfo
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- CN101468889A CN101468889A CNA2007100606223A CN200710060622A CN101468889A CN 101468889 A CN101468889 A CN 101468889A CN A2007100606223 A CNA2007100606223 A CN A2007100606223A CN 200710060622 A CN200710060622 A CN 200710060622A CN 101468889 A CN101468889 A CN 101468889A
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- chromium slag
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- alkaline residue
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Abstract
The invention discloses technology for calcining plaster plates by using 10 to 20 percent of chromium slag, and 60 to 70 percent of alkali slag at high temperature of between 1,250 and 1,450 DEG C in a vertical kiln and belongs to treatment and comprehensive utilization technology of chromium slag. The technology comprises: mixing 10 to 20 percent of the chromium slag, and 60 to 70 percent of the alkali slag with coal and clay; evenly mixing, pulverizing, pelletizing and calcining the mixture; and adopting the high-temperature environment of between 1,250 and 1,450 DEG C and carbonic oxide in the vertical kiln to reduce hexavalent chromium in the chromium slag into trivalent chromium, so as to further achieve the aims of detoxification, comprehensive utilization of firing materials, no secondary pollution, high treatment speed, low cost and reduction of the construction cost.
Description
Technical field
The invention belongs to the improvement and the comprehensive utilization technique of hazardous solid waste chromium slag and solid waste alkaline residue, be particularly related to and utilize mechanical shaft kiln high-temperature to administer sexavalent chrome and chromium slag and alkaline residue incinerating technology in the chromium slag, chromium slag, alkaline residue and coal, clay are all mixed, abrasive dust, balling-up, calcining, utilizing in the shaft kiln 1350 ℃ ± 100 ℃ of high temperature and carbon monoxide environment to make hexavalent chrome reduction is trivalent chromium, and then reach toxicide burn till material can realize the comprehensive utilization, do not produce secondary pollution, improvement speed is fast, and 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.In addition, chemical industry produces a large amount of alkaline residue contaminate environment, and loft need are rationally disposed.Dispose chromium slag, alkaline residue comprehensive utilization technique with shaft kiln, at home and abroad there is no report.The present invention is adjusted with 1350 ℃ ± 100 ℃ temperature and the processing condition of shaft kiln calcination cement clinker, utilize 1350 ℃ ± 100 ℃ high temperature, reduzate and acidic conditions are nontoxic trivalent chromium with the hexavalent chrome reduction in the chromium slag, and add alkaline residue realization resource utilization, through engineering approaches, 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 makes in the chromium slag hexavalent chrome reduction for not causing the trivalent chromium of secondary pollution with the reducing atmosphere that 1350 ℃ ± 100 ℃ high temperature of shaft kiln calcination cement clinker and dying fire operation produce.The present invention is a method of utilizing shaft kiln high-temperature calcination chrome slag dry detoxified chromium slag of the high temperature reduction and detoxication method that generally adopts being improved formation both at home and abroad, forms a kind of chromium slag, alkaline residue comprehensive utilization technique.
The present invention gives the effect that shaft kiln has 1350 ℃ ± 100 ℃ high temperature, carbon monoxide reduction and detoxication, 10-20% chromium slag and 60-70 % alkaline residue and coal, clay are all mixed, abrasive dust, balling-up, the chromium slag through preheating zone, thermal zone, makes that hexavalent chrome reduction is a trivalent chromium in the chromium slag under the operation of the dark dying fire of shaft kiln, and is fixed in the molten mass, enter cooling zone and put and burn till material exit quick cooling or the high pressure water anti-oxidation of shrend rapidly, principal reaction is as follows: under alkaline 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 reductive action with 1350 ℃ ± 100 ℃ high temperature in sexavalent chrome 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.Simultaneously, chromium slag, alkaline residue are sintered into cement mixture.Present method utilizes shaft kiln high-temperature to administer chromium slag, alkaline residue in a large number, and the essence of its engineering construction is the technology that forms a detoxifcation simple in structure and resource utilization.Be not afraid of after chromium slag, the dreg control on the one hand and scatter, run off, the permanent material of infiltration, creating conditions again on the other hand makes full use of the character of the physical mechanics that burns till material, can do the plasterboard material, realizes comprehensive utilization.
Dry detoxified being meant of 1350 ℃ ± 100 ℃ high temperature reductions of indication of the present invention contains 1350 ℃ ± 100 ℃ of shaft kiln high-temperatures, carbon monoxide reduction mechanism, the incinerating sintered material is arranged in the reducing substances environment when 500 ℃ of dischargings through calcining in about six hours, quick cooling (shrend is better) prevents oxygenizement to the trivalent chromium that has been reduced in the chromium slag.
It is a kind of 1350 ℃ ± 100 ℃ 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 mill; Being to adopt to administer the comprehensive utilization technique of the sophisticated high-temperature detoxification technology of chromium slag after improving 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, alkaline residue.
Description of drawings
Accompanying drawing is the structural representation of present method
Embodiment
Below in conjunction with accompanying drawing present method is further described
Embodiment 1
Press the engineering synoptic diagram of Fig. 1, chromium slag, alkaline residue are pulverized to be placed in the dryer dry, enter respectively through batching scale and coal, clay, building waste then.Raw grinding, enter the homogenizing storehouse, again through lift, add water, balling-up in advance, going into shaft kiln high-temperature burns till, at shaft kiln through preheating zone, thermal zone, cooling zone, the time (see figure 2) is burnt till material 1350 ℃ ± 100 ℃ of high temperature in the carbon monoxide environment about six hours, and relevant chromic regulation refers to that number ≦ 1.5mg/L becomes the plasterboard material in the judging standard.
Claims (4)
1, a kind of the chromium slag is used for the high temperature of machine shaft kiln 1350 DEG C ± 100 ℃, carbon monoxide forms chromium residue detoxifying and alkaline residue resource technology to hexavalent chrome reduction mechanism in the chromium slag; Burning till material after the detoxifcation is: utilize under machine shaft kiln 1350 DEG C ± 100 ℃ high temperature, the carbon monoxide reductive condition 10-20% chromium slag and 60-70 % alkaline residue to enter thermal zone 1350 ℃ ± 100 ℃ through the preheating zone under the dark dying fire operation of machine shaft kiln, make that hexavalent chrome reduction is a trivalent chromium in the chromium slag, after entering cooling zone, put and burn till the material exit in 500 ℃ ± 50 ℃ quick cooling or the high pressure water anti-oxidation of shrend rapidly, and then generate stable chromium slag and burn till material, form a safe non-secondary pollution economy, society, the tangible comprehensive utilization technique of environmental benefit.
2, under 1350 ℃ ± 100 ℃ 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 1350 ℃ ± 100 ℃, and thermal zone 900 ℃, 500 ℃ ± 50 ℃ of cooling zones; Sexavalent chrome in the chromium slag there is the intensive reduction, detoxifies and prevents oxygenizement.
4, the ratio of chromium slag, alkaline residue and coal, clay in the claim " 1-3 " should be controlled at 10-20:60-70:15:10 and be advisable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100606223A CN101468889A (en) | 2007-12-28 | 2007-12-28 | High-temperature calcination technology for 10-20% chromic slag and 60-70% alkaline residue gypsum plate under 1350 DEG C +/- 100 DEG C in vertical kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100606223A CN101468889A (en) | 2007-12-28 | 2007-12-28 | High-temperature calcination technology for 10-20% chromic slag and 60-70% alkaline residue gypsum plate under 1350 DEG C +/- 100 DEG C in vertical kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101468889A true CN101468889A (en) | 2009-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100606223A Pending CN101468889A (en) | 2007-12-28 | 2007-12-28 | High-temperature calcination technology for 10-20% chromic slag and 60-70% alkaline residue gypsum plate under 1350 DEG C +/- 100 DEG C in vertical kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10207966B2 (en) | 2014-12-31 | 2019-02-19 | Sabic Global Technologies B.V. | Process for enhancing the performance of the dehydrogenation of alkanes |
-
2007
- 2007-12-28 CN CNA2007100606223A patent/CN101468889A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10207966B2 (en) | 2014-12-31 | 2019-02-19 | Sabic Global Technologies B.V. | Process for enhancing the performance of the dehydrogenation of alkanes |
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Open date: 20090701 |