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A method for harmless disposal and resource utilization of nickel-chromium-containing stainless steel dust and sludge

A stainless steel and resource-based technology, applied in the field of circular economy, can solve the problems of poor separation effect of iron, chromium and nickel, low added value of recycled products, and large use of concentrated sulfuric acid, and achieve high added value of products, remarkable economy, and easy industrial production. Effect

Active Publication Date: 2020-07-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] For the stainless steel dust sludge wet treatment process: the use of concentrated sulfuric acid is large, the cost of acid leaching is high, and it is easy to introduce a large amount of Ca 2+ , Poor separation effect of iron, chromium and nickel in pickling solution, low added value of recycled products, etc.

Method used

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  • A method for harmless disposal and resource utilization of nickel-chromium-containing stainless steel dust and sludge

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Experimental program
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Effect test

Embodiment 1

[0034] Use 65% industrial waste sulfuric acid solution to dissolve stainless steel dust, H 2 SO 4 The gram equivalents of stainless steel dust are 1.5 times of Fe, Cr, Ni gram equivalents in stainless steel dust sludge, the acid hydrolysis temperature is 80°C, and the acid hydrolysis time is 150min. After filtration, the filter residue and filtrate were obtained. Next, use 65% industrial waste sulfuric acid solution to dissolve the filter residue, H 2 SO 4 The gram equivalents of Fe, Cr, and Ni in the filter residue are 2.0 times, the acid hydrolysis temperature is 80°C, and the acid hydrolysis time is 30 minutes. After filtering, a secondary filter residue and a secondary filtrate are obtained. After two times of acid hydrolysis, the content of heavy metals in the secondary filter residue can reach the safe discharge standard. The two acidolysis filtrates are combined, the industrial by-product green vitriol is added to the acidolysis filtrate, and the Cr in the filtrate...

Embodiment 2

[0036] Use 80% industrial waste sulfuric acid solution to dissolve stainless steel dust, H 2 SO 4 The gram equivalents of stainless steel dust are 3.0 times that of Fe, Cr, and Ni in stainless steel dust. The acid hydrolysis temperature is 80°C, and the acid hydrolysis time is 60 minutes. After filtration, the filter residue and filtrate were obtained. Next, use 80% industrial waste sulfuric acid solution to dissolve the filter residue, H 2 SO 4 The gram equivalents of Fe, Cr, and Ni in the filter residue are 1.2 times, the acid hydrolysis temperature is 80°C, and the acid hydrolysis time is 90 minutes. After filtering, a secondary filter residue and a secondary filtrate are obtained. After two times of acid hydrolysis, the content of heavy metals in the secondary filter residue can reach the safe discharge standard. The two acidolysis filtrates are combined, the industrial by-product green vitriol is added to the acidolysis filtrate, and the Cr in the filtrate 6+ reduce...

Embodiment 3

[0038] Use 70% industrial waste sulfuric acid solution to dissolve stainless steel dust, H 2 SO 4 The gram equivalents of the stainless steel dust are 2.0 times the Fe, Cr, Ni gram equivalents in the stainless steel dust sludge, the acid hydrolysis temperature is 80°C, and the acid hydrolysis time is 120min. After filtration, the filter residue and filtrate were obtained. Next, use 70% industrial waste sulfuric acid solution to dissolve the filter residue, H 2 SO 4 The gram equivalents of Fe, Cr, and Ni in the filter residue are 1.5 times, the acid hydrolysis temperature is 80°C, and the acid hydrolysis time is 60 minutes. After filtering, a secondary filter residue and a secondary filtrate are obtained. After two times of acid hydrolysis, the content of heavy metals in the secondary filter residue can reach the safe discharge standard. The two acidolysis filtrates are combined, the industrial by-product green vitriol is added to the acidolysis filtrate, and the Cr in the...

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Abstract

The invention belongs to the technical field of circular economy, and particularly relates to a method for harmless treatment and resource utilization of nickel-chromium containing stainless steel dust sludge. The stainless steel dust sludge is adopted as raw materials, and chromic hydroxide, sodium dichromate, sodium sulfate and mica iron oxide are obtained through the procedures of acidolysis, nickel recovery, sodium phosphate regeneration, chromium recovery and hydro-thermal synthesis. Through the procedures of industrial waste sulfuric acid secondary acidolysis, selective sediment, hydro-thermal synthesis and the like, low-cost, green and high-added-value utilization of the stainless steel dust sludge is achieved. The method has the advantages that high efficiency and environment protection are achieved, and industrial production is easy; and the method has remarkable economic, environmental and social benefits.

Description

technical field [0001] The invention belongs to the technical field of circular economy, and in particular relates to a method for harmless disposal and resource utilization of nickel-chromium-containing stainless steel dust and mud. Background technique [0002] According to statistics from the International Stainless Steel Forum (ISSF), global stainless steel production was 48.1 million tons in 2017, an increase of 5.8% over the previous year. At the same time, according to the statistics of the Stainless Steel Branch of the China Special Steel Enterprises Association, China's crude stainless steel production in 2017 was 25.7737 million tons (accounting for about 53.6% of the global production in the same period), an increase of 4.74% over the previous year. A large amount of stainless steel dust will be produced in the process of stainless steel production. Stainless steel dust includes: stainless steel pickling sludge and stainless steel dust. [0003] (1) In order to o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B23/00
CPCC22B7/007C22B7/02C22B23/043C22B23/0461Y02P10/20
Inventor 刘波张深根
Owner UNIV OF SCI & TECH BEIJING