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A method of making lightweight ceramsite from electroplating sludge

A technology of lightweight ceramsite and electroplating sludge, which is applied in the field of lightweight ceramsite, can solve the problems of microbial toxicity, etc., and achieve the effect of large amount of sludge, simple process, and thorough detoxification

Active Publication Date: 2018-02-16
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 toxicity of electroplating sludge itself to microorganisms, biological treatment is still in the exploratory stage

Method used

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  • A method of making lightweight ceramsite from electroplating sludge
  • A method of making lightweight ceramsite from electroplating sludge
  • A method of making lightweight ceramsite from electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: The electroplating sludge is wet ground to 150 mesh (the weight is 30wt% of the mixed mud before firing), added and dried to a moisture content of 5% and dry ground 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 expanding agent (the weight is 5wt% of the mixed mud before firing %), mixed uniformly and other treatments, the mixed sample was pressed by a granulator to grow into a long strip-shaped ceramsite raw material of 20mm × width 10mm × thickness 10mm, and dried in the low temperature zone of 300°C at the kiln tail of the double-cylinder rotary kiln 5 for 40 Minutes, 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

[0045] Example 2: Wet-grind electroplating sludge to 160 mesh (the weight is 35wt% of the mixed mud before firing), add and dry to 6% moisture content and dry-grind to 120 mesh urban sludge, weathered rock, silt or Kaolin (the weight is 55wt% of the mixed mud before firing), then add dry grinding to 120 mesh reducing agent (the weight is 9wt% of the mixed mud before firing) and bulking agent (the weight is 1wt% of the mixed mud before firing) , mixed uniformly and other treatments, 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, and is dried in the low-temperature zone of the kiln tail of the double-tube rotary kiln 5 at 350°C for 40 minutes, and then dried in the kiln The first calcination in the high temperature zone of 1250°C for 45 minutes, after discharging and cooling, the light ceramsite finished product is obtained.

Embodiment 3

[0046] Example 3: Wet grind the electroplating sludge to 170 mesh (the 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 (the weight is 50wt% of the mixed mud before firing), then add dry grinding to 130 mesh reducing agent (the weight is 8wt% of the mixed mud before firing) and bulking agent (the weight is 2wt% of the mixed mud before firing) , mixed uniformly and other treatments, 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 heated at a high temperature of 1250 °C at the kiln head. Calcined in the zone for 40 minutes, discharged and cooled to obtain light ceramsite finished product.

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Abstract

The invention relates to a method for preparing light ceramisite by means of electroplating sludge. The method comprises the following steps that 1, raw materials are supplied by weight; 2, the electroplating 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 electroplating sludge 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 electroplating sludge treatment, in particular to a method for harmlessly treating electroplating sludge through incineration by using a double-cylinder rotary kiln and firing it into lightweight ceramsite. Background technique [0002] Electroplating sludge refers to heavy metal-containing sludge waste generated after wastewater treatment in the electroplating industry, and is included in the seventeenth category of hazardous waste in the national hazardous waste list. As the "final state" of electroplating wastewater, although its amount is much less than that of wastewater, since heavy metals such as Cu, Ni, Cr, Zn, Fe in wastewater are transferred to sludge, in a sense, Electroplating sludge is more harmful to the environment than electroplating wastewater. If this extremely harmful electroplating sludge is not disposed of in any way, its damage to the ecological environment is self-evident. On the other hand,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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