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Method for detoxifying chromium slag and recycling compound by hydrothermal reduction through abandoned biomass

A technology for waste biomass and chromium compounds, which is applied in the fields of aluminum compounds, chemical instruments and methods, and solid waste removal. Effect

Active Publication Date: 2018-02-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The above research provides us with a new idea, using abundant sources of waste such as biomass straw to replace energy material starch as a carbon source for hydrothermal reaction, and using cellulose components that also have a polysaccharide structure to hydrothermally reduce the hexavalent chromium slag. Chromium, while detoxifying, prepare high-quality products with chromium compounds. This kind of waste biomass is used to detoxify chromium slag through hydrothermal reduction of carbon source, and at the same time, high-quality products with chromium compounds are prepared, which have the characteristics of low cost and high added value. and this method has not been reported

Method used

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  • Method for detoxifying chromium slag and recycling compound by hydrothermal reduction through abandoned biomass
  • Method for detoxifying chromium slag and recycling compound by hydrothermal reduction through abandoned biomass
  • Method for detoxifying chromium slag and recycling compound by hydrothermal reduction through abandoned biomass

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] Example 1: Taking chromium slag 1 as raw material

[0041] The main ingredients of raw materials are as follows:

[0042] Table 1 Main components of chromium slag

[0043] Element

Cr 2 o 3

Cr 6+

SiO 2

Fe

Al 2 o 3

CaO

V

content

19.7％

0.5％

4.5％

31.5％

14.6％

6.4％

0.2％

[0044] Specific steps are as follows:

[0045] 1) Prepare 1L of sodium sulfate solution with a concentration of 5g / L.

[0046]2) Weigh the chromium-containing slag, add the chromium slag 1 to the sodium sulfate solution prepared in step 1) according to the addition amount of the solid / liquid ratio of 1:1, and use the sulfate radical with a similar ionic radius to replace the chromium-containing slag. Hexavalent chromium in slag.

[0047] 3) Filtrating the suspension liquid obtained in step 2) to obtain enriched hexavalent chromium solution A-1 and solid insoluble matter.

[0048] 4) Calcining the solid insoluble matter obtain...

example 2

[0055] Example 2: Chromium slag-2 is raw material

[0056] The raw material composition is as follows:

[0057] Table 2 Main components of chromium slag 2

[0058] Element

Al 2 o 3

Cr 2 o 3

Na 2 o

SO 3

Fe 2 o 3

V 2 o 5

SiO 2

content

35％

32.8％

18.2％

7.67％

2.30％

1.38％

1.35％

[0059] Specific steps are as follows:

[0060] 1) Prepare 1L of sodium sulfate solution with a concentration of 5g / L.

[0061] 2) Weigh the chromium-containing slag, add the chromium slag 2 to the sodium sulfate solution prepared in step 1) according to the addition amount of the solid / liquid ratio of 1:1, and replace the chromium-containing slag with a sulfate radical with a similar ionic radius Hexavalent chromium in slag.

[0062] 3) Filtrating the suspension liquid obtained in step 2) to obtain enriched hexavalent chromium solution A-2 and solid insoluble matter.

[0063] 4) Calcining the solid insoluble mat...

example 3

[0070] Example 3: Taking chromium slag 3 as raw material

[0071] The main ingredients of raw materials are as follows:

[0072] Table 3 Chromium slag 3 main components

[0073] Element

Cr 2 o 3

SiO 2

Fe

Al 2 o 3

MgO

CaO

content

41.7％

3.2％

20.2％

15.3％

8.2％

0.8％

[0074] Specific steps are as follows:

[0075] 1) Prepare 1L of sodium sulfate solution with a concentration of 5g / L.

[0076] 2) Weigh the chromium-containing slag, add the chromium slag 3 to the sodium sulfate solution prepared in step 1) according to the solid / liquid ratio of 1:1, and replace the chromium-containing slag with a sulfate radical with a similar ionic radius. Hexavalent chromium in slag.

[0077] 3) Filtrating the suspension liquid obtained in step 2) to obtain enriched hexavalent chromium solution A-3 and solid insoluble matter.

[0078] 4) Calcining the solid insoluble matter obtained in step 3) at high temperature for subs...

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Abstract

The invention belongs to the technical field of wet metallurgy and resource recycling, and provides a method for detoxifying chromium slag and recycling a compound by hydrothermal reduction through abandoned biomass. The method comprises the following steps: displacing a hexavalent chromium solution by using a displacement solution with the similar ion radius under the alkaline condition at first;detoxifying hexavalent chromium in a reduction manner by using biomass such as cotton stalk as a polysaccharide carrier and a carbon source to replace the traditional methanol, starch and the like; and collecting a recyclable chromium compound while assisting in a hydrothermal process to accelerate reduction reaction. By the method, alkaline leached over-low chromium slag is fixed by hydrothermalreduction through biomass residues, the problem of chromium slag pollution is solved fundamentally, moreover, the problem of acid corrosion is solved, meanwhile, the biomass replaces a traditional reducing agent, chromium is recycled, and chromium resources are recycled while the detoxifying cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and resource recovery, and specifically relates to a method for hydrothermally reducing waste biomass to detoxify chromium slag and recovering compounds. Background technique [0002] Chromium is an important strategic metal element. Its metals, alloy materials and various compounds play an increasingly important role in the industrial fields of national defense, machinery manufacturing, metallurgy, chemical industry, materials and new energy. my country's chrome ore resources are extremely scarce, mainly distributed in Xinjiang, Tibet, Inner Mongolia and Gansu provinces, and the output and grade of chrome ore are still showing a downward trend, which is far from meeting modern consumer demand. Calcium roasting technology is generally used in the production of chromium salts in my country. For every 1 ton of product produced, 2.5 to 3 tons of chromium slag will be produced. According to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/32B09B3/00A62D3/37C01F7/00
CPCA62D3/37C22B7/006C22B34/32B09B3/00C01F7/785Y02P10/20
Inventor 马伟孟凡庆郭丽燕柳卓陈振王墨炎高健马湘懿才之涵
Owner DALIAN UNIV OF TECH
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