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Method for producing basic chrome sulphate with dichromiumtris (chromate) slag

A technology of chromium chromate slag and chromium sulfate, applied in the direction of chromium sulfate and the like, can solve the problems of low environmental protection benefit, high unit consumption, unfavorable energy saving and emission reduction, etc., and achieve the effect of saving resources, reducing unit consumption and solving environmental protection problems.

Active Publication Date: 2013-12-25
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a method for producing basic chromium sulfate by utilizing chromium chromate slag, aiming to solve the problems of high unit consumption, low environmental protection benefit, and unfavorable energy saving and emission reduction in the traditional basic chromium sulfate production method question

Method used

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  • Method for producing basic chrome sulphate with dichromiumtris (chromate) slag
  • Method for producing basic chrome sulphate with dichromiumtris (chromate) slag

Examples

Experimental program
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Embodiment 1

[0062] In the first step, 500Kg of chromate slag (Cr 2 o 3 Content: 8.58%) with 610Kg industrial concentrated sulfuric acid (content 93.5%) acid-dissolved completely;

[0063] Second step, 110Kg urea is dissolved in 1100Kg water and is configured into urea solution, and 500Kg sodium rufium is dissolved in 1000Kg water and is configured into sodium rufium solution;

[0064] In the third step, slowly add the configured urea solution and the sodium red alum solution into the acid-soluble chromate slag feed liquid;

[0065] The 4th step, heating feed liquid to boiling, and continuous reaction 2 hours;

[0066] The fifth step is to filter the reacted feed liquid, and the filtrate is liquid basic chromium sulfate. After testing the basicity of the liquid basic chromium sulfate, the finished product of basic chromium sulfate is obtained through a spray dryer. The results of the full analysis of the finished product are as follows:

[0067] content

[0068] After inspect...

Embodiment 2

[0070] In the first step, 500Kg of chromate slag (Cr 2 o 3 Content: 8.58%) with 615Kg industrial concentrated sulfuric acid (content 93.5%) acid-dissolved completely;

[0071] Second step, 119Kg urea is dissolved in 1190Kg water and is configured into urea solution, and 500Kg red alum sodium is dissolved in 1000Kg water and is configured into red alum sodium solution;

[0072] In the third step, slowly add the configured urea solution and the sodium red alum solution into the acid-soluble chromate slag feed liquid;

[0073] The 4th step, heating feed liquid to boiling, and continuous reaction 2.5 hours;

[0074] The fifth step is to filter the reacted feed liquid, and the filtrate is liquid basic chromium sulfate. After testing the basicity of the liquid basic chromium sulfate, the finished product of basic chromium sulfate is obtained through a spray dryer. The results of the full analysis of the finished product are as follows:

[0075] content

[0076] After i...

Embodiment 3

[0078] In the first step, 500Kg of chromate slag (Cr 2 o 3 Content: 8.58%) with 620Kg industrial concentrated sulfuric acid (content 93.5%) acid-dissolved completely;

[0079] Second step, 125Kg urea is dissolved in 1250Kg water and is configured into urea solution, gets workshop sodium dichromate content and is 400L of red alum sodium acidification solution of 1250g / l, then adds 800Kg water and is diluted into red alum sodium solution;

[0080] In the third step, slowly add the configured urea solution and the sodium red alum solution into the acid-soluble chromate slag feed liquid;

[0081] The 4th step, heating feed liquid to boiling, and continuous reaction 3 hours;

[0082] The fifth step is to filter the reacted feed liquid, and the filtrate is liquid basic chromium sulfate. After testing the basicity of the liquid basic chromium sulfate, the finished product of basic chromium sulfate is obtained through a spray dryer.

[0083] The results of the full analysis of the ...

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Abstract

The invention discloses a method for producing basic chrome sulphate with dichromiumtris (chromate) slag. The method for producing basic chrome sulphate with the dichromiumtris (chromate) slag comprises the following steps of completely dissolving the dichromiumtris (chromate) slag with concentrated sulfuric acid, that is, adding 1.93t sulfuric acid per ton of Cr2O3 according to a Cr2O3 content in a raw material, adding 0.37-0.42t urea per ton of Cr2O3 to prepare a 10% urea solution and a 50% sodium bichromate solution, slowly adding the prepared urea solution and the sodium bichromate solution into acid soluble dichromiumtris (chromate) slag slurry, heating the slurry to be boiled, performing continuous reaction for 2-3h, filtering the reacted slurry, and after alkalinity of liquid basic chrome sulphate is detected to be qualified, obtaining a basic chrome sulphate finish product through a spray dryer. The method takes the waste dichromiumtris (chromate) slag as a raw material, is environment-friendly, saves resources, reduces unit consumption, produces obvious economic benefits, and provides an energy-saving, environment-friendly and synergetic novel production technology.

Description

technical field [0001] The invention belongs to the technical field of chromium sulfate production, and in particular relates to a method for producing basic chromium sulfate by utilizing chromium chromate slag. Background technique [0002] Basic chromium sulfate is mainly used in leather tanning agents. The quality of leather generally depends on the quality of leather tanning agents and the processing technology of leather tanning agents. Large variety of products; [0003] The molecular formula of basic chromium sulfate is represented by the following general formula: Cr(OH)n(SO4)0.5(3-n), when n=3, it means chromium hydroxide (Cr(OH)3), when n=0, it is Chromium sulfate (Cr 2 (SO 4 ) 3 ), it is customary to use basicity to express the basicity of basic chromium sulfate, that is, the percentage of the number of hydroxide (OH-) equivalents in basic chromium sulfate to the total number of anion equivalents in the molecule 3, that is: basicity=n / 3*100 %, the basicity of...

Claims

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Application Information

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IPC IPC(8): C01G37/08
Inventor 韩登仑张忠元张宏军谢希智
Owner GANSU JINSHI CHEM
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