CN101468882A - High-temperature calcination technology for 20-30% chromic slag, 20-30% fly ash and 20-40% limestone cement clinker under 1350 DEG C +/- 100 DEG C in vertical kiln - Google Patents

High-temperature calcination technology for 20-30% chromic slag, 20-30% fly ash and 20-40% limestone cement clinker under 1350 DEG C +/- 100 DEG C in vertical kiln Download PDF

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Publication number
CN101468882A
CN101468882A CNA2007100606276A CN200710060627A CN101468882A CN 101468882 A CN101468882 A CN 101468882A CN A2007100606276 A CNA2007100606276 A CN A2007100606276A CN 200710060627 A CN200710060627 A CN 200710060627A CN 101468882 A CN101468882 A CN 101468882A
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CN
China
Prior art keywords
chromium slag
chromium
slag
shaft kiln
flyash
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Pending
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CNA2007100606276A
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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 CNA2007100606276A priority Critical patent/CN101468882A/en
Publication of CN101468882A publication Critical patent/CN101468882A/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
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/364—Avoiding environmental pollution during cement-manufacturing
    • 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
    • C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
    • 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
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting
    • C04B7/4476—Selection of the kiln atmosphere
    • 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Public Health (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention belongs to treatment and comprehensive utilization technology of chromium slag, which comprises: mixing 20 to 30 percent of chromium slag, 20 to 30 percent of fly ash and 20 to 40 percent of limestone 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 as a cement clinker, no secondary pollution, high treatment speed, low cost and reduction of the construction cost.

Description

Shaft kiln 1350 DEG C ± 100 ℃ high-temperature calcination 20-30% chromium slag 20-30% flyash 20-40% limestone cement clinker technology
Technical field
The invention belongs to the improvement and the comprehensive utilization technique of hazardous solid waste chromium slag and solid waste flyash, Wingdale, be particularly related to the technology of utilizing mechanical shaft kiln high-temperature to administer sexavalent chrome and chromium slag and flyash in the chromium slag, limestone calcination, chromium slag, flyash, Wingdale 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, coal-fired industry produces a large amount of flyash contaminate environment, and loft need are rationally disposed.Dispose chromium slag, flyash, Wingdale 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 hexavalent chrome reduction in the chromium slag, and add flyash, Wingdale 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, forms the technology that a kind of chromium slag, flyash, limestone calcination become cement clinker.
The present invention gives the effect that shaft kiln has 1350 ℃ ± 100 ℃ high temperature, carbon monoxide reduction and detoxication, 20-30% chromium slag 20-30% flyash 20-40% Wingdale 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, limestone calcination become cement clinker.Present method utilizes shaft kiln high-temperature to administer chromium slag, flyash 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 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 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.
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, Wingdale 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 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 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 20-30% chromium slag 20-30% flyash 20-40% Wingdale 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 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, the ratio of chromium slag, flyash, Wingdale and coal, clay in the claim " 1-3 " should be controlled the chromium slag and be advisable at 20-30:20-30:20-40:15:10.
CNA2007100606276A 2007-12-28 2007-12-28 High-temperature calcination technology for 20-30% chromic slag, 20-30% fly ash and 20-40% limestone cement clinker under 1350 DEG C +/- 100 DEG C in vertical kiln Pending CN101468882A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007100606276A CN101468882A (en) 2007-12-28 2007-12-28 High-temperature calcination technology for 20-30% chromic slag, 20-30% fly ash and 20-40% limestone cement clinker under 1350 DEG C +/- 100 DEG C in vertical kiln

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007100606276A CN101468882A (en) 2007-12-28 2007-12-28 High-temperature calcination technology for 20-30% chromic slag, 20-30% fly ash and 20-40% limestone cement clinker under 1350 DEG C +/- 100 DEG C in vertical kiln

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CN101468882A true CN101468882A (en) 2009-07-01

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2555980C2 (en) * 2012-08-10 2015-07-10 Федеральное государственное бюджетное учреждение науки Объединенный институт высоких температур Российской академии наук (ОИВТ РАН) Production of cement clinker
CN112209644A (en) * 2020-09-29 2021-01-12 梁平海螺水泥有限责任公司 Method for producing silicate cement clinker by using high-sulfur coal as chromium removing agent
CN114873935A (en) * 2022-03-17 2022-08-09 洛阳展腾科技有限公司 Quick lime sintering method capable of reducing flue gas purification cost

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2555980C2 (en) * 2012-08-10 2015-07-10 Федеральное государственное бюджетное учреждение науки Объединенный институт высоких температур Российской академии наук (ОИВТ РАН) Production of cement clinker
CN112209644A (en) * 2020-09-29 2021-01-12 梁平海螺水泥有限责任公司 Method for producing silicate cement clinker by using high-sulfur coal as chromium removing agent
CN112209644B (en) * 2020-09-29 2022-06-24 梁平海螺水泥有限责任公司 Method for producing silicate cement clinker by using high-sulfur coal as chromium removal agent
CN114873935A (en) * 2022-03-17 2022-08-09 洛阳展腾科技有限公司 Quick lime sintering method capable of reducing flue gas purification cost

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Open date: 20090701