CN101468888A - High-temperature calcination technology for 1-5% chromic slag, 5-10% chromium-containing clay, 10-20% alkaline residue, 20-30% construction garbage and 20-30% limestone cement clinker under 1350 DEG C - Google Patents

High-temperature calcination technology for 1-5% chromic slag, 5-10% chromium-containing clay, 10-20% alkaline residue, 20-30% construction garbage and 20-30% limestone cement clinker under 1350 DEG C Download PDF

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Publication number
CN101468888A
CN101468888A CNA2007100606384A CN200710060638A CN101468888A CN 101468888 A CN101468888 A CN 101468888A CN A2007100606384 A CNA2007100606384 A CN A2007100606384A CN 200710060638 A CN200710060638 A CN 200710060638A CN 101468888 A CN101468888 A CN 101468888A
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CN
China
Prior art keywords
chromium
chromium slag
alexandrolite
slag
alkaline residue
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Pending
Application number
CNA2007100606384A
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Chinese (zh)
Inventor
刘志刚
刘泽宇
李福顺
纪柱
魏彤宇
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TIANJIN DAJUN TECHNOLOGY DEVELOPMENT Co Ltd
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TIANJIN DAJUN TECHNOLOGY DEVELOPMENT Co Ltd
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Application filed by TIANJIN DAJUN TECHNOLOGY DEVELOPMENT Co Ltd filed Critical TIANJIN DAJUN TECHNOLOGY DEVELOPMENT Co Ltd
Priority to CNA2007100606384A priority Critical patent/CN101468888A/en
Publication of CN101468888A publication Critical patent/CN101468888A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

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 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, 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

Shaft kiln 1350 DEG C ± 100 a ℃ high-temperature calcination 1-5% chromium slag 5-10% contains alexandrolite 10-20% alkaline residue 20-30% building waste 20-30% limestone cement clinker technology
Technical field
The invention belongs to hazardous solid waste chromium slag, contain alexandrolite and solid waste alkaline residue, 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 in the alexandrolite, contain alexandrolite, alkaline residue, building waste, the technology of limestone calcination, with the chromium slag, contain alexandrolite, alkaline residue, building waste and coal, Wingdale 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, but and then reach toxicide and burn till material making cement grog, 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, 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, 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 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 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 both at home and abroad being improved formation, the technology that form a kind of chromium slag, contain alexandrolite, alkaline residue, building waste is sintered into cement clinker.
The present invention gives the effect that shaft kiln has 1350 ℃ ± 100 ℃ high temperature, carbon monoxide reduction and detoxication, 1-5% chromium slag 5-10% is contained alexandrolite 10-20% alkaline residue 20-30% building waste 20-30% Wingdale and coal all to be mixed, abrasive dust, balling-up, the chromium slag and contain alexandrolite 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 the chromium slag and contains chromic diffuse pollution in the alexandrolite; Utilize shaft kiln high-temperature and carbon monoxide reductive action that the chromium slag is contained 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 is detoxified.Simultaneously, the chromium slag, contain alexandrolite, 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, 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, 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 grog 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) is to the chromium slag and contain the trivalent chromium that has been reduced in the alexandrolite and prevent oxygenizement.
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 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, alkaline residue, building waste, Wingdale and pulverize to be placed in the dryer and dry, then through batching scale and coal, enter raw grinding respectively, 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 clinker 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 building waste, 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 5-10% contains alexandrolite 10-20% alkaline residue 20-30% building waste 20-30% Wingdale enter thermal zone 1350 ℃ ± 100 ℃ through the preheating zone under machine shaft kiln dying fire operation under the carbon monoxide reductive condition, make the chromium slag and contain that hexavalent chrome reduction is a trivalent chromium in the alexandrolite, 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; Chromium slag and middle sexavalent chrome there are the intensive reduction, detoxify and prevent oxygenizement.
4, chromium slag in the claim " 1-3 ", contain the ratio of alexandrolite, alkaline residue, building waste, Wingdale and coal, should be controlled at 1-5:5-10:10-20:20-30:20-30:10 and be advisable.
CNA2007100606384A 2007-12-28 2007-12-28 High-temperature calcination technology for 1-5% chromic slag, 5-10% chromium-containing clay, 10-20% alkaline residue, 20-30% construction garbage and 20-30% limestone cement clinker under 1350 DEG C Pending CN101468888A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007100606384A CN101468888A (en) 2007-12-28 2007-12-28 High-temperature calcination technology for 1-5% chromic slag, 5-10% chromium-containing clay, 10-20% alkaline residue, 20-30% construction garbage and 20-30% limestone cement clinker under 1350 DEG C

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007100606384A CN101468888A (en) 2007-12-28 2007-12-28 High-temperature calcination technology for 1-5% chromic slag, 5-10% chromium-containing clay, 10-20% alkaline residue, 20-30% construction garbage and 20-30% limestone cement clinker under 1350 DEG C

Publications (1)

Publication Number Publication Date
CN101468888A true CN101468888A (en) 2009-07-01

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CNA2007100606384A Pending CN101468888A (en) 2007-12-28 2007-12-28 High-temperature calcination technology for 1-5% chromic slag, 5-10% chromium-containing clay, 10-20% alkaline residue, 20-30% construction garbage and 20-30% limestone cement clinker under 1350 DEG C

Country Status (1)

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CN (1) CN101468888A (en)

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Open date: 20090701