CN101468885A - High-temperature calcination technology for 1-5% chromic slag, 1-5% chromium-containing clay, 20-30% fly ash, 20-30% alkaline residue and 20-35% construction garbage cement mixing material under 1350 - Google Patents
High-temperature calcination technology for 1-5% chromic slag, 1-5% chromium-containing clay, 20-30% fly ash, 20-30% alkaline residue and 20-35% construction garbage cement mixing material under 1350 Download PDFInfo
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- CN101468885A CN101468885A CNA2007100606331A CN200710060633A CN101468885A CN 101468885 A CN101468885 A CN 101468885A CN A2007100606331 A CNA2007100606331 A CN A2007100606331A CN 200710060633 A CN200710060633 A CN 200710060633A CN 101468885 A CN101468885 A CN 101468885A
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- chromium
- chromium slag
- slag
- alexandrolite
- alkaline residue
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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, 1 to 5 percent of clay containing chromium, 20 to 30 percent of fly ash, 20 to 30 percent of alkali slag and 20 to 35 percent of building rubbish with coal; 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 and the clay containing chromium into trivalent chromium, so as to further achieve the aims of detoxification, usage of firing materials of the fly ash, the alkali slag 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 improvement chromium slag and contain sexavalent chrome and chromium slag and flyash in the alexandrolite, alkaline residue, building waste incinerating technology, with the chromium slag, contain alexandrolite, flyash, alkaline residue, building waste and coal all mix, 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, but and then reach toxicide and burn till material making cement blended material, 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 and contains alexandrolite 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, and chemical industry produces a large amount of alkaline residues, and construction industry produces a large amount of building waste contaminate environment, and loft need are rationally disposed.Dispose the chromium slag, contain alexandrolite, flyash, alkaline residue, building waste comprehensive utilization technique with shaft kiln, at home and abroad there is no report.The present invention is 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 chromium slag with the hexavalent chrome reduction that contains in the alexandrolite, and add flyash, alkaline residue, 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 the chromium slag and contains in the alexandrolite 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 both at home and abroad being improved formation, the technology that form a kind of chromium slag, contain alexandrolite, flyash, alkaline residue, building waste is sintered into cement mixture.
The present invention gives shaft kiln and has 1350 ℃ ± 100 ℃ high temperature, the effect of carbon monoxide reduction and detoxication, 1-5% chromium slag 1-5% is contained alexandrolite 20-30% flyash 20-30% alkaline residue 20-35% building waste and coal all to be mixed, abrasive dust, balling-up, the chromium slag with contain under the alexandrolite shaft kiln dying fire operation through the preheating zone, thermal zone, make the chromium slag and contain that hexavalent chrome reduction is a trivalent chromium in the alexandrolite, 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 the chromium slag with contain in the alexandrolite in the sexavalent chrome and kiln 1350 ℃ ± 100 ℃ high temperature and carbon monoxide environment, be reduced to nontoxic trivalent chromium, and generate more stable complex compound, the chromium slag with contain alexandrolite and detoxified.Simultaneously, the chromium slag, contain alexandrolite, flyash, alkaline residue, building waste and be sintered into cement clinker.Present method is utilized shaft kiln high-temperature to administer the chromium slag in a large number, is contained alexandrolite, flyash, alkaline residue, building waste, and the essence of its engineering construction is the technology that forms a detoxifcation simple in structure and resource utilization.On the one hand the chromium slag, contain not to be afraid of after alexandrolite, flyash, alkaline residue, 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 seven 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; Be to adopt to administer the chromium slag both at home and abroad and contain the comprehensive utilization technique of the sophisticated high-temperature detoxification technology of alexandrolite after improving, it is a safe non-secondary pollution, economic benefit, social benefit, environmental benefit significantly fully utilize the chromium slag, contain alexandrolite, the technology of flyash, alkaline residue, 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, with the chromium slag, contain alexandrolite, flyash, alkaline residue, building waste and pulverize to be placed in the dryer and dry, enter raw grinding respectively through batching scale and coal then, 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 1350 ℃ ± 100 ℃ of high temperature about seven hours, burn till material in the carbon monoxide environment, 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 is to the chromium slag and contain hexavalent chrome reduction mechanism in the alexandrolite, forms the chromium slag and contains the alexandrolite detoxifcation and flyash, alkaline residue resource technology; Burning till material after the detoxifcation is: utilize machine shaft kiln 1350 DEG C ± 100 ℃ high temperature, 1-5% chromium slag 1-5% contains alexandrolite 20-30% flyash 20-30% alkaline residue 20-35% building waste enter thermal zone 1350 ℃ ± 100 ℃ through the preheating zone under machine shaft kiln dying fire operation under the carbon monoxide reductive condition, 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 cement clinker technology 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, chromium slag in the claim " 1-3 ", contain the ratio of alexandrolite, flyash, alkaline residue, Wingdale and coal, should be controlled at 1-5:1-5:20-30:20-30:20-35:15:10 and be advisable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100606331A CN101468885A (en) | 2007-12-28 | 2007-12-28 | High-temperature calcination technology for 1-5% chromic slag, 1-5% chromium-containing clay, 20-30% fly ash, 20-30% alkaline residue and 20-35% construction garbage cement mixing material under 1350 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100606331A CN101468885A (en) | 2007-12-28 | 2007-12-28 | High-temperature calcination technology for 1-5% chromic slag, 1-5% chromium-containing clay, 20-30% fly ash, 20-30% alkaline residue and 20-35% construction garbage cement mixing material under 1350 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101468885A true CN101468885A (en) | 2009-07-01 |
Family
ID=40826729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100606331A Pending CN101468885A (en) | 2007-12-28 | 2007-12-28 | High-temperature calcination technology for 1-5% chromic slag, 1-5% chromium-containing clay, 20-30% fly ash, 20-30% alkaline residue and 20-35% construction garbage cement mixing material under 1350 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101468885A (en) |
-
2007
- 2007-12-28 CN CNA2007100606331A patent/CN101468885A/en active Pending
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Open date: 20090701 |