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Dewatering method for stainless steel sludge

A stainless steel and sludge technology, applied in dewatering/drying/concentrating sludge treatment and other directions, can solve the problems of harm, large output, complex composition of stainless steel cold-rolled heavy metal sludge, etc., and achieve simple operation process, environmental protection, and dehydration effect. Good results

Inactive Publication Date: 2013-01-30
陈宇青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Baoshan Iron and Steel Co., Ltd. Technology Center's stainless steel cold-rolled heavy metal sludge treatment and utilization countermeasures disclosed that the stainless steel cold-rolled heavy metal sludge has complex components, large output, and serious hazards, which has become a difficult point in the environmental protection management of stainless steel enterprises. At present, there is no safe, economical and practical way of mass utilization at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In a stainless steel enterprise in Songyang County, Zhejiang Province, the stainless steel sludge with a pH of 1.7 and a mass solid content of 10% produced by wet smelting was first added to the thickening tank with polyacrylamide PAM, and the polyacrylamide was added to the stainless steel sludge tank. The concentration in the solution is 10ppm, then react for 15 minutes, and let it stand fully; then add calcium phosphate, and the quality of calcium phosphate added is 3.5% of the stainless steel sludge; stir and react for 15 minutes; finally, after the reaction is completed, it is filtered by mechanical pressure That's it.

[0017] After air-drying the above-mentioned filtered stainless steel sludge for 2 hours, the final water content in the stainless steel sludge is 14.7%, which is very beneficial for subsequent sludge treatment.

Embodiment 2

[0019] In a stainless steel enterprise in Songyang County, Zhejiang Province, the stainless steel sludge with a pH of 1.9 and a mass solid content of 8% produced by wet smelting was first added to the thickening tank with polyacrylamide PAM, and the polyacrylamide was added to the stainless steel sludge tank. The concentration in the solution is 15ppm, then react for 15 minutes, and let it stand fully; then add magnesium phosphate, and the quality of magnesium phosphate added is 3% of the stainless steel sludge; carry out stirring reaction for 15 minutes; finally, after the reaction is completed, press filter That's it.

[0020] The above-mentioned stainless steel sludge after pressure filtration was air-dried for 2 hours and then measured. Finally, the water content in the stainless steel sludge was 13.9%, which is very beneficial to the subsequent sludge treatment.

Embodiment 3

[0022] In a stainless steel enterprise in Songyang County, Zhejiang Province, the stainless steel sludge with a pH of 1.8 and a mass solid content of 9% produced by wet smelting was first added to the thickening tank with polyacrylamide PAM, and the polyacrylamide was added to the stainless steel sludge tank. The concentration in the solution is 12ppm, then react for 15 minutes, and let it stand fully; then add the mixture of calcium phosphate and magnesium phosphate, the weight ratio of the two substances is 1:1, and the quality of the two substances added is 3% of the stainless steel sludge ; Stir the reaction for 15 minutes; finally, after the reaction is finished, it can be filtered by mechanical pressure.

[0023] The above-mentioned stainless steel sludge after pressure filtration was air-dried for 2 hours and then measured. Finally, the water content in the stainless steel sludge was 14.2%, which is very beneficial to the subsequent sludge treatment.

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PUM

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Abstract

The invention discloses a sludge processing method, which particularly relates to a dewatering method for stainless steel sludge. The dewatering method for the stainless steel sludge comprises the following steps of: adding polyacrylamide (PAM) into a concentration basin of stainless steel sludge of which the pH (potential of hydrogen) is 1.6-1.9 and the mass solid content is 8-10%, wherein the stainless steel sludge is generated by wet method smelting; enabling the concentration of the PAM in a stainless steel sludge basin to be 10-20ppm; then reacting for 15 minutes; then, adding calcium phosphate, magnesium phosphate or the mixture of the calcium phosphate and the magnesium phosphate, wherein the addition is 2-3.5% of the stainless steel sludge; carrying out stirring reaction for 15 minutes; and finally, carrying out mechanical filter pressing after reaction is finished. The dewatering method for the stainless steel sludge has the advantages of simple and convenient operation process and better dewatering effect, and is more favorable for further processing the sludge, and the environment is protected.

Description

technical field [0001] The invention relates to a method for treating sludge, in particular to a method for dehydrating stainless steel sludge. Background technique [0002] Most of the heavy metals in stainless steel sludge can be recovered after chromium and nickel are recovered by hydrometallurgy. The stainless steel waste sludge (sludge with very low heavy metal content, hereinafter referred to as waste sludge) produced by hydrometallurgy contains a small amount of heavy metals such as chromium and nickel. , is still classified as hazardous solid waste. For the healthy and sustainable development of the stainless steel industry, it is very necessary to reduce, recycle, and harmless waste sludge. Since the existing sludge dewatering technology is relatively backward, the moisture content of the dehydrated material is still 60%-70% (when the ordinary filter press is used for sludge dehydration, the moisture content of the output is about 65%), making waste The operating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 陈启松陈宇青于晨徐斌于继军
Owner 陈宇青
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