CN102875116A - Method for preparing chromium-containing sludge ceramsite - Google Patents
Method for preparing chromium-containing sludge ceramsite Download PDFInfo
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- CN102875116A CN102875116A CN201210394435XA CN201210394435A CN102875116A CN 102875116 A CN102875116 A CN 102875116A CN 201210394435X A CN201210394435X A CN 201210394435XA CN 201210394435 A CN201210394435 A CN 201210394435A CN 102875116 A CN102875116 A CN 102875116A
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- chromium
- sludge
- mud
- bearing sludge
- haydite
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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
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention discloses a method for preparing chromium-containing sludge ceramsite. The method comprises the following steps of: performing wet grinding on chromium sludge to be 120 meshes; drying municipal sludge, decomposed rock, silt or kaolin and performing dry grinding together with a reducing agent to be 100 meshes; uniformly mixing and pressing into strip-shaped particles with diameter of 10 mm and length of 20 mm; and balling, drying and then feeding into a rotary kiln to calcine at the high temperature of 1,230-1,330 DEG C for 45 minutes to obtain the chromium-containing sludge ceramsite. The method has the characteristics of capability of treating chromium-containing sludge produced by leather production, complete and reliable detoxication, simple process, large sludge consumption, capability of simultaneously treating most of heavy metal pollutants and low production cost, and has the advantages of feasible technology and minimum cost compared with various methods for treating heavy metal in China at present. Inspection shows that a finished product meets the control index requirement of being used as a road bed material, concrete aggregate and light brick filler and being used for producing cement.
Description
Technical field
The invention belongs to field of material preparation, be specifically related to a kind of method for preparing the chromium-bearing sludge haydite.
Background technology
Use a certain amount of chrome tanning agent in the leather process of manufacture, along with washing step, the unnecessary chromium cpd that contains flows in the waste water, forms chromium hydroxide precipitation through adding alkali, after the press filtration chromium-bearing sludge.Chromic salts is the important Chemicals of tanning industry, and every production 1 mark ox raw hide approximately produces chromium-bearing sludge 1Kg, and the chromium-bearing sludge total chrome content is 0.6-1.0% approximately, wherein Cr
6+Account for 40%, Cr
6+Poisonous, can cause chrome ulcer, erosion of nasal septum, blood chromium, the various diseases such as lung cancer, people's lethal quantity are the 5-8 gram, belong to the hazardous industry refuse that environment, human body is had serious harm.China's leather output (amounting to a mark ox raw hide) approximately 16.7 hundred million in 2012 then will produce 1,670,000 tons of chromium-bearing sludges.Chromium-bearing sludge is poisonous Hazardous wastes, as without disposing reliably the detoxifcation scheme, only uses then hypertoxic Cr in the dust of general burying method
6+Enter soil and groundwater with rainwater, will pollute a large amount of soils and underground water, seriously restrict the development of leather industry.The seventies begins, and just pay much attention in the whole nation, and arranges problem ten remainders, but does not find so far a kind of effective, economic, practical improvement method, and the improvement of chromium-bearing sludge remains very severe problem.
In view of the foregoing, at present there is limitation in domestic multiple detoxification, controls especially that mud is not controlled soil, the halfway situation of detoxifcation should change as early as possible.
The chromium-bearing sludge wet method detoxifcation: this technology is after with the chromium-bearing sludge wet grinding, utilize acidic medium to replace the solubility in acid sexavalent chrome in the chromium slag, water-soluble sexavalent chrome in the liquid phase fully, and then drop into the reduction medicament with the hexavalent chrome reduction in the liquid phase to trivalent chromium, realize chromic slag harmlessness.The shortcoming of the method is the condition that the sexavalent chrome solution is never up to standard, extract is very few, impurity is many, tailings too much and not possesses large production, and tailings is processed or existing problems after extracting.
Chromium-bearing sludge is dry detoxified: this technology at high temperature utilize reducing substances with the hexavalent chrome reduction in the chromium-bearing sludge for trivalent chromium and with its fixing technique at normal temperatures.Dry detoxifiedly mainly contain the following several and technical problem that exists: (1) is lower than 1150 ℃ and can't destroys original phase structure in the chromium-bearing sludge according to the test of company, can not form new mineral, by reductive agent with part Cr
6+The Cr that reduces
3+Be in unstable or metastable condition.(2) adopt in temperature and be added in 1150 ℃-1300 ℃ and be acid SiO
2And so on material, reach the partial melting state, can thoroughly destroy chromium mud phase structure, form new mineral, can effectively administer chromium mud, but stoneware product, brick and other earth burning goods all have shape, size, appearance requirement, are not suitable for the method as the improvement of chromium mud, and having aggregate only does not have above-mentioned limitation.Utilizing chromium mud to produce haydite can effectively dispose chromium mud, has also accomplished comprehensive utilization of waste materials.(3) administer the chromium slag with middle high-temperature cement mineralizer method and have very large hidden danger.Manufacture of cement condition and chromium salt production conditional likelihood are not with Cr in theory
6+Become Cr
3+But with Cr
3+Become Cr
6+, this point is found Cr the cement from European countries
6+The reason that produces, to operator's harm, the whole process of formulating the 2PPm standard has obtained sufficient proof.Just lean on CO temporarily with part Cr with cement ruling by law reason chromium mud
6+Be reduced to Cr
3+, only have a small amount of melts in the cement, these Cr
3+Do not enter the new mineral structure and form steady state, China is to Cr in the cement
6+Content does not have standard, and shaft kiln production itself is exactly the production method that falls behind, disperses, and is theoretically unsound with cement ruling by law reason chromium mud.Cement products has water permeate common examples is arranged, imagine the several years after, several hundred million tons of cement products ooze out the liquid that exceeds standard under the rainwater etch, the descendant will live in what kind of terrified and helpless among.(4) administer chromium mud with high temperature (1450 ℃-1600 ℃) method thoroughly reliable to accomplish except poison, clay fused(calcium magnesium)phosphate, the cast stone high cost made of chromium is used for the glass colorant consumption very little, all is finalized.Replace part lime with chromium mud and obtain in the recent period certain progress for agglomerate ironmaking, but the technique adjustment that causes thus, the dedusting grade of each airborne dust point improves, and prevents secondary pollution, and the factors such as invalid components in the chromium mud all can produce certain latent cost.
Because the existence of chromium mud indissoluble yellow ultramarine sosoloid etc., want the reliable existing structure that must destroy chromium mud except poison, at present China is in the chromium mud improvement method of industrial test and suitability for industrialized production, can accomplish except poison thoroughly, method all is to utilize more than 1500 ℃ to be the method for liquid with chromium mud is molten reliably, this class methods energy consumption is very high, refractory materials is very expensive, cost or latent cost are very high, chromium mud additional proportion is low, eat the quantity of slag little, shipment distance is far away, prevents that the secondary pollution difficulty is large, has certain limitation.
Therefore, must seek a kind of new chromium-bearing sludge effectively and reasonably, the improvement method of economic, convenient, a large amount of digestion.Preparation chromium-bearing sludge haydite method is administered the heavy metal chromium waste, and thorough, reliable except poison, technique is simple, eat the mud amount large, can administer simultaneously most of heavy metal contaminants, low production cost, compare its technical feasibility, Least-cost with the whole bag of tricks of present domestic improvement heavy metal.
Summary of the invention
The object of the present invention is to provide a kind of method for preparing the chromium-bearing sludge haydite, method of the present invention is administered the heavy metal chromium waste, except malicious thorough, reliable, technique is simple, eats the mud amount large, can administer simultaneously most of heavy metal contaminants, low production cost, compare its technical feasibility, Least-cost with the whole bag of tricks of present domestic improvement heavy metal.Finished product is roadbed material, aggregate, light cinder brick stopping composition and the control index request that is used for manufacture of cement through the check character cooperation.
For achieving the above object, the present invention adopts following technical scheme:
A kind of method for preparing the chromium-bearing sludge haydite may further comprise the steps:
(1) chromium-bearing sludge is through wet-milling to 120 order; Municipal sludge, decayed rack, mud or kaolin are dried rear and reductive agent is dry grinded together to 100 orders;
(2) mixing of materials with step (1) is even, and being pressed into diameter is 10mm, and length is the bar shaped particle of 20mm, enters 1230-1330 ℃ of calcining of rotary kiln high temperature 45 minutes after balling-up, oven dry, namely obtains the chromium-bearing sludge haydite; Discharging is sent into finished goods warehouse and is got final product after cooling.
The mass percent of each component of raw material is: chromium-bearing sludge 0-60%, municipal sludge, decayed rack, mud or kaolin 30-95%, reductive agent 5-10%.
When being high temperature, described reductive agent produces the raw material of reducing substances.
Form the glassy phase of magnesioferrite, pyroxene-type mineral and about 50% in the finished product haydite, Cr
6+Leaching content is less than 0.004ppm, and total chromium leaches content less than 0.01ppm.
The finished product haydite is roadbed material, aggregate, light cinder brick stopping composition and the control index request that is used for manufacture of cement through the check character cooperation; Can supply cement mill, stirring station, the relevant units such as building constructor, lightweight brick field use.
Beneficial effect of the present invention: method of the present invention is administered the heavy metal chromium waste, except malicious thorough, reliable, technique is simple, eat the quantity of slag large, can administer simultaneously most of heavy metal contaminants, low production cost is with the whole bag of tricks comparison of present domestic improvement heavy metal, its technical feasibility, Least-cost.Finished product is roadbed material, aggregate, light cinder brick stopping composition and the control index request that is used for manufacture of cement through the check character cooperation.
Description of drawings
Fig. 1 is Cr in the chromium mud aggregate
6+The relation of content and temperature.
Embodiment
Embodiment 1
A kind of method for preparing the chromium-bearing sludge haydite may further comprise the steps:
(1) chromium-bearing sludge is through wet-milling to 120 order; Municipal sludge, decayed rack, mud or kaolin are dried rear and reductive agent is dry grinded together to 100 orders;
(2) mixing of materials with step (1) is even, and being pressed into diameter is 10mm, and length is the bar shaped particle of 20mm, enters 1230 ℃ of calcinings of rotary kiln high temperature 45 minutes after balling-up, oven dry, namely obtains the chromium-bearing sludge haydite; Discharging is sent into finished goods warehouse and is got final product after cooling.
The mass percent of each component of raw material is: chromium-bearing sludge 30%, municipal sludge, decayed rack, mud or kaolin 60%, reductive agent 10%.
When being high temperature, described reductive agent produces the raw material of reducing substances.
Embodiment 2
A kind of method for preparing the chromium-bearing sludge haydite may further comprise the steps:
(1) chromium-bearing sludge is through wet-milling to 120 order; Municipal sludge, decayed rack, mud or kaolin are dried rear and reductive agent is dry grinded together to 100 orders;
(2) mixing of materials with step (1) is even, and being pressed into diameter is 10mm, and length is the bar shaped particle of 20mm, enters 1270 ℃ of calcinings of rotary kiln high temperature 45 minutes after balling-up, oven dry, namely obtains chromium mud haydite; Discharging is sent into finished goods warehouse and is got final product after cooling.
The mass percent of each component of raw material is: chromium-bearing sludge 50%, municipal sludge, decayed rack, mud or kaolin 40%, reductive agent 10%.
When being high temperature, described reductive agent produces the raw material of reducing substances.
A kind of method for preparing the chromium-bearing sludge haydite may further comprise the steps:
(1) chromium mud and chromium slag are through wet-milling to 120 order; Municipal sludge, decayed rack, mud or kaolin are dried rear and reductive agent is dry grinded together to 100 orders;
(2) mixing of materials with step (1) is even, and being pressed into diameter is 10mm, and length is the bar shaped particle of 20mm, enters 1250 ℃ of calcinings of rotary kiln high temperature 45 minutes after balling-up, oven dry, namely obtains the chromium-bearing sludge haydite; Discharging is sent into finished goods warehouse and is got final product after cooling.
The mass percent of each component of raw material is: chromium-bearing sludge 60%, municipal sludge, decayed rack, mud or kaolin 30%, reductive agent 10%.
When being high temperature, described reductive agent produces the raw material of reducing substances.
The performance of table 1 chromium-bearing sludge haydite
The chemical composition of table 2 chromium mud haydite
The concrete performance of table 3 chromium-bearing sludge haydite
The above only is preferred embodiment of the present invention, and all equalizations of doing according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (3)
1. method for preparing the chromium-bearing sludge haydite, it is characterized in that: described method may further comprise the steps:
(1) chromium-bearing sludge is through wet-milling to 120 order; Municipal sludge, decayed rack, mud or kaolin are dried rear and reductive agent is dry grinded together to 100 orders;
(2) mixing of materials with step (1) is even, and being pressed into diameter is 10mm, and length is the bar shaped particle of 20mm, enters 1230-1330 ℃ of calcining of rotary kiln high temperature 45 minutes after balling-up, oven dry, namely obtains containing chromium chromium mud haydite; Discharging is sent into finished goods warehouse and is got final product after cooling.
2. the method for preparing the chromium-bearing sludge haydite according to claim 1, it is characterized in that: the mass percent of each component of raw material is: chromium-bearing sludge 0-60%, municipal sludge, decayed rack, mud or kaolin 30-95%, reductive agent 5-10%.
3. the method for preparing the chromium-bearing sludge haydite according to claim 1 is characterized in that: the raw material that produces reducing substances when described reductive agent is high temperature.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105347837A (en) * | 2015-12-09 | 2016-02-24 | 漳州微水固体废物处置有限公司 | Method for preparing light ceramisite by means of chromium-containing sludge |
| CN105347838A (en) * | 2015-12-09 | 2016-02-24 | 漳州微水固体废物处置有限公司 | Method for preparing light ceramisite by means of electroplating sludge |
| CN105439533A (en) * | 2016-01-11 | 2016-03-30 | 曹树梁 | Method and production line for producing ceramic particles by using various hazardous wastes |
| CN106001080A (en) * | 2016-05-17 | 2016-10-12 | 曹树梁 | Method for separating and porcelainizing soil for treating toxic land parcel |
| CN106082966A (en) * | 2016-06-13 | 2016-11-09 | 曹树梁 | Electroplating sludge ceramic aggregate and manufacture method thereof |
| CN106083130A (en) * | 2016-06-13 | 2016-11-09 | 曹树梁 | Copper fumes slag ceramic aggregate and manufacture method thereof |
| CN106082964A (en) * | 2016-06-13 | 2016-11-09 | 曹树梁 | Hydrargyrum mine tailing ceramic aggregate and manufacture method thereof |
| CN106082963A (en) * | 2016-06-13 | 2016-11-09 | 曹树梁 | Leather-making mud ceramic aggregate and manufacture method thereof |
| CN106187094A (en) * | 2016-07-20 | 2016-12-07 | 武汉钢铁股份有限公司 | A kind of cold rolling chromium-bearing sludge haydite and preparation method |
| CN109231959A (en) * | 2018-08-15 | 2019-01-18 | 陕西科技大学 | A kind of preparation method using leather sludge production exterior wall tile |
| CN112573901A (en) * | 2020-12-14 | 2021-03-30 | 中国科学院过程工程研究所 | Method for preparing homogeneous porous ceramsite by using sludge and homogeneous porous ceramsite |
| CN112939622A (en) * | 2021-01-25 | 2021-06-11 | 肇庆市武大环境技术研究院 | Method for preparing ceramsite by using chromium-containing sludge |
| CN114988909A (en) * | 2022-06-21 | 2022-09-02 | 浙江方远新材料股份有限公司 | Preparation process of ceramsite prepared from site-contaminated soil |
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| CN101717240A (en) * | 2009-11-26 | 2010-06-02 | 山东轻工业学院 | Method for preparing porcelain granules from tannery sludge |
| CN102358704A (en) * | 2011-07-21 | 2012-02-22 | 沈阳航空航天大学 | Method for preparing ceramsite by sintering high chromium-contaminated soil |
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2012
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Patent Citations (3)
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| US20080311288A1 (en) * | 2005-12-29 | 2008-12-18 | Liangjie Dong | Methods and Compositions for Removal of Arsenic and Heavy Metals From Water |
| CN101717240A (en) * | 2009-11-26 | 2010-06-02 | 山东轻工业学院 | Method for preparing porcelain granules from tannery sludge |
| CN102358704A (en) * | 2011-07-21 | 2012-02-22 | 沈阳航空航天大学 | Method for preparing ceramsite by sintering high chromium-contaminated soil |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105347838A (en) * | 2015-12-09 | 2016-02-24 | 漳州微水固体废物处置有限公司 | Method for preparing light ceramisite by means of electroplating sludge |
| CN105347837A (en) * | 2015-12-09 | 2016-02-24 | 漳州微水固体废物处置有限公司 | Method for preparing light ceramisite by means of chromium-containing sludge |
| CN112279623A (en) * | 2016-01-11 | 2021-01-29 | 曹树梁 | Method and production line for manufacturing ceramsite and ceramic particles from various hazardous wastes |
| CN105439533A (en) * | 2016-01-11 | 2016-03-30 | 曹树梁 | Method and production line for producing ceramic particles by using various hazardous wastes |
| CN106001080A (en) * | 2016-05-17 | 2016-10-12 | 曹树梁 | Method for separating and porcelainizing soil for treating toxic land parcel |
| CN112427447A (en) * | 2016-05-17 | 2021-03-02 | 曹树梁 | Method for treating toxic land soil and product thereof |
| CN106082966A (en) * | 2016-06-13 | 2016-11-09 | 曹树梁 | Electroplating sludge ceramic aggregate and manufacture method thereof |
| CN106082963A (en) * | 2016-06-13 | 2016-11-09 | 曹树梁 | Leather-making mud ceramic aggregate and manufacture method thereof |
| CN106082964A (en) * | 2016-06-13 | 2016-11-09 | 曹树梁 | Hydrargyrum mine tailing ceramic aggregate and manufacture method thereof |
| CN106083130A (en) * | 2016-06-13 | 2016-11-09 | 曹树梁 | Copper fumes slag ceramic aggregate and manufacture method thereof |
| CN106187094A (en) * | 2016-07-20 | 2016-12-07 | 武汉钢铁股份有限公司 | A kind of cold rolling chromium-bearing sludge haydite and preparation method |
| CN106187094B (en) * | 2016-07-20 | 2019-01-18 | 武汉钢铁有限公司 | A kind of cold rolling chromium-bearing sludge haydite and preparation method |
| CN109231959A (en) * | 2018-08-15 | 2019-01-18 | 陕西科技大学 | A kind of preparation method using leather sludge production exterior wall tile |
| CN112573901A (en) * | 2020-12-14 | 2021-03-30 | 中国科学院过程工程研究所 | Method for preparing homogeneous porous ceramsite by using sludge and homogeneous porous ceramsite |
| CN112939622A (en) * | 2021-01-25 | 2021-06-11 | 肇庆市武大环境技术研究院 | Method for preparing ceramsite by using chromium-containing sludge |
| CN114988909A (en) * | 2022-06-21 | 2022-09-02 | 浙江方远新材料股份有限公司 | Preparation process of ceramsite prepared from site-contaminated soil |
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Application publication date: 20130116 |