Acid washing sludge recycling method

A kind of pickling sludge and physical technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve environmental pollution and other problems, and achieve the effects of reducing environmental pollution, reducing energy consumption, and effectively recycling

Inactive Publication Date: 2016-08-17
TONGXIANG ZHIYUAN ECO FRIENDLY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the treatment of pickling sludge is landfill, which is easy to pollute the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In the method for recycling pickling sludge described in this example, firstly, the pickling sludge is subjected to primary physical drying, the temperature of which is controlled at 160°C, the moisture content of the pickling sludge is reduced to 12%, and then it is stirred , pulverize, add binder and mix evenly, wherein the binder is water glass, the binder content is 3.5% of the mass of pickling sludge, and then the mixture of binder and pickling sludge is sent to the ball press for pressing Form a sphere with a diameter of 35mm. After sieving, the sphere is subjected to secondary physical drying, and dried at a temperature of 600°C for 4 hours. The moisture content of the sphere is reduced to below 8%, and it can be reused as a raw material for an electric furnace in a steel factory. . The process of conveying the spheres to the secondary physical drying equipment is screening and conveying, and the broken or unballed ones are physically returned and conveyed during...

Embodiment 2

[0014] In the pickling sludge recycling method described in this example, first, the first-level physical drying of the pickling sludge is carried out, and the temperature is controlled at 280°C, and the moisture content of the pickling sludge is reduced to 16%, and then it is stirred , pulverize, add binder and mix evenly, wherein the binder is bentonite, the binder content is 5% of the mass of pickling sludge, and then the mixture of binder and pickling sludge is transported to the briquetting machine for pressing into The spheres with a diameter of 38mm are subjected to secondary physical drying after sieving, and are dried at a temperature of 800°C for 3.5 hours to reduce the moisture content of the spheres to below 8%, and then they can be reused as raw materials for electric furnaces in steel mills. The process of conveying the spheres to the secondary physical drying equipment is screening and conveying, and the broken or unballed ones are physically returned and conveye...

Embodiment 3

[0016] The pickling sludge recovery and utilization method described in this example first carries out first-level physical drying of the pickling sludge, the temperature of which is controlled at 400°C, and the moisture content of the pickling sludge is reduced to 18%, and then it is stirred , pulverize, add binder and mix evenly, wherein the binder is coal powder, and the binder content is 4% of the mass of pickling sludge, and then the mixture of binder and pickling sludge is transported to the briquetting machine for pressing Form a sphere with a diameter of 32mm. After passing the sieve, the sphere is subjected to secondary physical drying, and dried at a temperature of 100°C for 5 hours, and the moisture content of the sphere is reduced to below 8%. . The process of conveying the spheres to the secondary physical drying equipment is screening and conveying, and the broken or unballed ones are physically returned and conveyed during the process. Among them, the pickling ...

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PUM

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Abstract

The invention relates to an acid washing sludge recycling method. The method comprises the following steps: carrying out physical drying on acid washing sludge to lower the water content of the acid washing sludge to 10-20%, stirring, pulverizing, adding an adhesive which accounts for 6 wt% of the acid washing sludge, uniformly mixing, delivering the adhesive-acid washing sludge mixture to a ball press to obtain balls with the diameter of 30-40mm, screening, and drying the balls at 100-150 DEG C for 6 hours to lower the water content of the balls to 3% or below, wherein the balls can be recycled as a steel mill electric furnace raw material. According to the acid washing sludge recycling method, the physical treatment and adhesive treatment are performed to prepare the balls from the acid washing sludge and lower the water content to a certain degree, so that the balls satisfy the steel mill electric furnace recycling requirements, thereby effectively recycling the acid washing sludge, reducing the environmental pollution and lowering the energy consumption of the steel mill.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a method for recycling pickling sludge. Background technique [0002] With the depletion of resources and the continuous improvement of environmental protection requirements, the work of energy conservation and emission reduction of iron and steel is facing severe challenges. The amount of sludge produced by stainless steel pickling is about 3%-5% of the output of stainless steel. The sludge contains valuable metal elements such as Ni, Cr, Fe, etc., as well as CaF 2 , CaO, SiO 2 , CaSO 4 and other substances. Cr in sludge 6+ Potentially harmful to the environment if not handled properly. In recent years, the output of stainless steel in my country has increased year by year, and the accumulation of pickling sludge will increase. The rational use of these pickling sludge is related to the healthy development of my country's stainless steel enterprises, and has become one of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
CPCC02F11/12
Inventor 吴树彬李惠林金秀峰
Owner TONGXIANG ZHIYUAN ECO FRIENDLY TECH
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