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A method for hydrothermally reducing and detoxifying chromium slag and recovering compounds from waste biomass

A technology of waste biomass and chromium compounds, which is applied in the direction of aluminum compounds, chemical instruments and methods, and solid waste removal, can solve the problems of low cost and high added value, and solve the problem of acid corrosion and chromium slag pollution Effect

Active Publication Date: 2019-05-28
DALIAN UNIV OF TECH
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  • 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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  • A method for hydrothermally reducing and detoxifying chromium slag and recovering compounds from waste biomass
  • A method for hydrothermally reducing and detoxifying chromium slag and recovering compounds from waste biomass
  • A method for hydrothermally reducing and detoxifying chromium slag and recovering compounds from waste 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 hydrometallurgy and resource recovery, and provides a method for hydrothermally reducing waste biomass to detoxify chromium slag and recovering compounds. First, a replacement solution with a similar ionic radius is used to replace the hexavalent chromium solution under alkaline conditions, and biomass such as cotton stalks are used as polysaccharide carriers instead of the traditional methanol and starch as carbon sources to reduce and detoxify hexavalent chromium, assisting hydrothermal While accelerating the reduction reaction, chromium compounds that can be reused are obtained. This method not only fundamentally solves the problem of chromium slag pollution, but also solves the problem of acid corrosion through the hydrothermal reduction and fixation of biomass residues on alkaline leached low-chromium residues. At the same time, biomass is used to replace traditional reducing agents, and chromium is recovered to reduce Solve the problem of poisoning costs and realize the recovery of chromium resources at the same time.

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 Patents(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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