CN101468886A - Comprehensive utilization technology for high-temperature calcination of 1-10% chromic slag, 35-40% fly ash and 30-40% construction garbage under 1350 DEG C +/- 100 DEG C in vertical kiln - Google Patents
Comprehensive utilization technology for high-temperature calcination of 1-10% chromic slag, 35-40% fly ash and 30-40% construction garbage under 1350 DEG C +/- 100 DEG C in vertical kiln Download PDFInfo
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- CN101468886A CN101468886A CNA2007100606350A CN200710060635A CN101468886A CN 101468886 A CN101468886 A CN 101468886A CN A2007100606350 A CNA2007100606350 A CN A2007100606350A CN 200710060635 A CN200710060635 A CN 200710060635A CN 101468886 A CN101468886 A CN 101468886A
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- chromium slag
- chromium
- slag
- shaft kiln
- flyash
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention belongs to treatment and comprehensive utilization technology of chromium slag, which comprises: mixing 1 to 5 percent of chromium slag, 35 to 40 percent of fly ash, and 30 to 40 percent of building rubbish 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 a vertical kiln to reduce hexavalent chromium in the chromium slag into trivalent chromium, so as to further achieve the aims of detoxification, usage of firing materials of the fly ash and the building rubbish as addition of cement, no secondary pollution, high treatment speed, low cost and reduction of the construction cost.
Description
Technical field
The invention belongs to hazardous solid waste chromium slag and solid waste flyash, the improvement of building waste and comprehensive utilization technique, be particularly related to and utilize mechanical shaft kiln high-temperature to administer sexavalent chrome and chromium slag and flyash in the chromium slag, building waste incinerating technology, with the chromium slag, flyash, building waste and coal, clay all mixes, 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, coal-fired industry produces a large amount of flyash, construction industry produces a large amount of building waste contaminate environment, and loft need are rationally disposed.Dispose chromium slag, flyash, building waste 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 flyash, building waste 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, flyash, building waste comprehensive utilization technique.
The present invention gives the effect that shaft kiln has 1350 ℃ ± 100 ℃ high temperature, carbon monoxide reduction and detoxication, 1-10% chromium slag, 35-40% flyash, 30-40% building waste and coal, clay are all mixed, abrasive dust, balling-up, the chromium slag under shaft kiln dying fire operation through preheating zone, thermal zone, make that hexavalent chrome reduction is a trivalent chromium in the chromium slag, and be 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, flyash, building waste are sintered into cement mixture.Present method utilizes shaft kiln high-temperature to administer chromium slag, flyash, building waste 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 on the one hand chromium slag, flyash, building waste are administered and scatter, run off, the permanent material of infiltration creates conditions again on the other hand and makes full use of the character of the physical mechanics that burns till material, but the making cement blended material is realized 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, flyash, building waste.
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, flyash, building waste 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 Zhi Shuo ≦ 1.5mg/L becomes cement mixture 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 flyash, made from construction refuse 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 1-10% chromium slag, 35-40 % flyash 30-40% building waste to enter thermal zone 1350 ℃ ± 100 ℃ through the preheating zone under the operation of machine shaft kiln dying fire, 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, flyash, building waste and coal, clay in the claim " 1-3 " should be controlled the chromium slag and be advisable at 1-10:35-40:30-40:15:10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100606350A CN101468886A (en) | 2007-12-28 | 2007-12-28 | Comprehensive utilization technology for high-temperature calcination of 1-10% chromic slag, 35-40% fly ash and 30-40% construction garbage under 1350 DEG C +/- 100 DEG C in vertical kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100606350A CN101468886A (en) | 2007-12-28 | 2007-12-28 | Comprehensive utilization technology for high-temperature calcination of 1-10% chromic slag, 35-40% fly ash and 30-40% construction garbage under 1350 DEG C +/- 100 DEG C in vertical kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101468886A true CN101468886A (en) | 2009-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100606350A Pending CN101468886A (en) | 2007-12-28 | 2007-12-28 | Comprehensive utilization technology for high-temperature calcination of 1-10% chromic slag, 35-40% fly ash and 30-40% construction garbage under 1350 DEG C +/- 100 DEG C in vertical kiln |
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| CN (1) | CN101468886A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106082973A (en) * | 2016-03-08 | 2016-11-09 | 侯绪华 | A kind of chromium slag brickmaking technology |
| CN112479725A (en) * | 2020-12-01 | 2021-03-12 | 中冶焦耐(大连)工程技术有限公司 | Brick for dry quenching furnace cooling chamber and preparation method thereof |
-
2007
- 2007-12-28 CN CNA2007100606350A patent/CN101468886A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106082973A (en) * | 2016-03-08 | 2016-11-09 | 侯绪华 | A kind of chromium slag brickmaking technology |
| CN112479725A (en) * | 2020-12-01 | 2021-03-12 | 中冶焦耐(大连)工程技术有限公司 | Brick for dry quenching furnace cooling chamber and preparation method thereof |
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Open date: 20090701 |