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Method for preparing light ceramisite by means of chromium-containing sludge

A light ceramsite and chrome sludge technology, applied in the field of light ceramsite, can solve the problems of low chromium sludge addition ratio, high cost or potential cost, and difficulty in secondary pollution, etc. Low cost, thorough effect of detoxification

Active Publication Date: 2016-02-24
ZHANGZHOU WEISHUI SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of insoluble calcium chromate solid solution in chrome sludge, the existing structure of chromium sludge must be destroyed in order to reliably detoxify. At present, among the chromium sludge treatment methods that have been industrialized and produced, a thorough and reliable method for detoxification can be achieved. They all use the method of melting chrome mud into liquid at a temperature above 1500°C. This method consumes a lot of energy, the refractory material is expensive, the cost or potential cost is high, the proportion of chrome mud added is low, the amount of slag eaten is small, and the transportation distance is long. It is difficult to prevent secondary pollution and has certain limitations

Method used

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  • Method for preparing light ceramisite by means of chromium-containing sludge
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  • Method for preparing light ceramisite by means of chromium-containing sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment one: Wet grind chromium-containing sludge to 150 mesh (weight is 30wt% of the mixed mud before firing), add and dry to 5% moisture content and dry grind to 100 mesh urban sludge, weathered rock, silt, clay or kaolin (The weight is 55wt% of the mixed mud before firing), and then add dry grinding to 100 mesh reducing agent (the weight is 10wt% of the mixed mud before firing) and the expanding agent (the weight is 5wt% of the mixed mud before firing), After uniform mixing and other treatments, the mixed sample is pressed by a granulator into a long strip-shaped ceramsite raw material of 20 mm × width 10 mm × thickness 10 mm, dried in the low temperature zone of the kiln tail of the double-cylinder rotary kiln 5 for 40 minutes, and then Calcined in the high temperature zone of 1200°C at the kiln head for 50 minutes, discharged and cooled to obtain light-weight ceramsite finished products.

Embodiment 2

[0042] Embodiment two: The chromium-containing sludge is wet ground to 160 mesh (weight is 35wt% of the mixed mud before firing), added to dry to 6% moisture content and dry ground to 120 mesh city sludge, weathered rock, silt or kaolin (weight It is 55wt% of the mixed mud before firing), and then dry-milled to 120 mesh reducing agent (the weight is 9wt% of the mixed mud before firing) and expanding agent (the weight is 1wt% of the mixed mud before firing), and mix well After such treatment, the mixed sample is pressed by a granulator to grow into a cylindrical ceramic raw material with a diameter of 20mm and a diameter of 10mm. It is dried in the low-temperature zone of the kiln tail of the double-cylinder rotary kiln 5 at 350°C for 40 minutes, and then dried at the kiln head at 1250°C. Calcined in the high temperature zone for 45 minutes, discharged and cooled to obtain light ceramsite finished product.

Embodiment 3

[0043] Embodiment three: Wet grind the chromium-containing sludge to 170 mesh (weight is 40wt% of the mixed mud before firing), add and dry to 7% moisture content and dry grind to 130 mesh urban sludge, weathered rock, silt or kaolin (weight 50wt% of the mixed mud before firing), then add dry grinding to 130 mesh reducing agent (8wt% of the mixed mud before firing) and bulking agent (2wt% of the mixed mud before firing), and mix well After the treatment, the mixed sample is pressed into a spherical ceramic raw material with a diameter of 10mm by a granulator, dried in the low temperature zone of 400°C at the kiln tail of the double-cylinder rotary kiln 5 for 35 minutes, and then calcined in the high temperature zone of 1250°C at the kiln head for 40 minutes. Minutes, after discharging and cooling, the light ceramsite finished product is obtained.

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Abstract

The invention relates to a method for preparing light ceramisite by means of chromium-containing sludge. The method comprises the following steps that 1, raw materials are supplied by weight; 2, the chromium-containing sludge is ground to 150-200 meshes in a wet mode, municipal sludge, decomposed rock, sludge and clay or kaolin are ground to 100-150 meshes in a dry mode, anthracite is ground to 100-150 meshes in a drying mode, and ferric oxide or hematite is ground to 100-150 meshes in a dry mode; 3, all the raw materials are mixed evenly; 4, the mixed materials are deep refined and then extruded into raw ceramisite through a granulating machine; 5, the raw ceramisite is preheated and calcined into light ceramisite through a double-barrel rotary kiln, and after discharging and cooling are performed, the finished light ceramisite is obtained. According to the method, the chromium-containing sludge generated through leather production is effectively utilized, toxin removing is thorough, the reliability is achieved, the technology is simple, the sludge consumption is large, heavy metal pollutants can be simultaneously treated, the production cost is low, and the prepared ceramisite can be reused in construction industry.

Description

technical field [0001] The invention relates to the field of chromium-containing sludge treatment, in particular to a method for harmlessly treating chromium-containing sludge through incineration by using a double-cylinder rotary kiln and burning it into lightweight ceramsite. Background technique [0002] A certain amount of chrome tanning agent is used in the leather production and processing process. With the washing process, excess chromium-containing compounds flow into the wastewater, and chromium hydroxide precipitates are formed by adding alkali, and chromium-containing sludge is formed after pressure filtration. Chromium salt is an important chemical product in the tanning industry. Every standard piece of cow hide produces about 1Kg of chromium-containing sludge, and the total chromium content of chromium-containing sludge is about 0.6-1.0%, of which Cr 6+ Accounted for 40%, Cr 6+ It is toxic and can cause various diseases such as chromium sores, nasal septum ero...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B33/132
CPCY02P40/60
Inventor 孙辉跃舒建峰徐军富陈志峰严杏文
Owner ZHANGZHOU WEISHUI SOLID WASTE DISPOSAL CO LTD
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