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Method for preparing basic chromium sulfate by using vanadium extraction chromium slag

A technology for extracting vanadium chromium slag and chromium sulfate, which is applied in the direction of chromium sulfate and process efficiency improvement, and can solve problems such as waste, waste of resources, environmental hazards, etc., and achieve the effect of short process and convenient operation

Inactive Publication Date: 2013-06-05
四川格瑞化工科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the chromium resources in my country's vanadium-chromium slag can meet the needs of my country's chromium salt bulk product - basic chromium sulfate (annual output and consumption of more than 300,000 tons, content of Cr 2 o 3 25%) about half of the chromium resource required for production, but it is discarded in the current vanadium extraction process and environmental protection treatment process, causing serious waste of resources and environmental hazards

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  • Method for preparing basic chromium sulfate by using vanadium extraction chromium slag

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example 1

[0019] Dry 200g of vanadium and chromium slag (containing 45.87% chromium) to make its moisture <5%, put it into the reaction kettle, add 50g of water for wetting, then add 160g of sulfuric acid with a concentration of 98%, and the stirring rate is 60 rpm / min, maintain the reaction temperature at 50°C, stir for 4 hours, then add 3000g of water to dissolve the reactants for more than 12 hours. Filter the water immersion and acid soluble matter to obtain 190g of leach acid residue and 3200g of filtrate; add 6g of sodium humate solution (2.6g of sodium humate and 3.4g of water) to the filtrate, stir for 0.5 hours, and filter to obtain 3193.5g of filtrate ( Chromium-containing 2.95%), add sodium hydroxide solution (sodium hydroxide 130g, water 370g) and adjust alkalinity to be 30%, obtain chromium hydroxide filter cake 132.8g through filtration, add concentrated sulfuric acid 66.4g reaction after vacuum drying then, obtain Basic chromium sulfate was 144.19g, and the yield of chro...

example 2

[0021] Dry 200g of vanadium and chromium slag (containing 45.87% chromium) to make its moisture <5%, put it into the reaction kettle, add 100g of water for wetting, then add 200g of sulfuric acid with a concentration of 98%, and the stirring speed is 60 rpm / min, maintain the reaction temperature at 90°C, stir for 4 hours, and then add 2000g of water to dissolve the reactants for more than 12 hours. Filter the water immersion and acid soluble matter to obtain 195g of leach acid residue and 2280g of filtrate; add 10g of sodium humate solution (including 4.4g of sodium humate and 5.6g of water) to the filtrate, stir for 0.5 hours, and filter to obtain 2278.5g of filtrate ( Chromium-containing 3.1%), add sodium hydroxide solution (sodium hydroxide 160g, water 370g) and adjust alkalinity to be 38.5%, obtain chromium hydroxide filter cake 139.6g through filtration, add concentrated sulfuric acid 100g reaction after vacuum drying then, obtain alkali Formula chromium sulfate 151.52g,...

example 3

[0023] Dry 200g of vanadium and chromium slag (containing 45.87% chromium) to make its moisture <5%, put it into the reaction kettle, add 200g of water for wetting, then add 200g of sulfuric acid with a concentration of 98%, and the stirring speed is 60 rpm / min, maintain the reaction temperature at 80°C, stir for 4 hours, then add 1600g of water to dissolve the reactants for more than 12 hours. Filter the water immersion and acid soluble matter to obtain 192g of acid leaching residue and 2000g of filtrate; add the filtrate to 12g of sodium humate solution (including 5.3g of sodium humate and 6.7g of water), stir for 1 hour, and filter to obtain a filtrate of 1998.5 g (containing chromium 3.0%), add sodium hydroxide solution (sodium hydroxide 190g, water 400g) to adjust the alkalinity to 45%, obtain chromium hydroxide filter cake 148.6g through filtration, then add concentrated sulfuric acid 148.6g to react after vacuum drying , Obtain 165.52 g of basic chromium sulfate, and t...

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Abstract

The invention relates to a method for preparing basic chromium sulfate by using vanadium extraction chromium slag, which adopts vanadium extraction chromium slag as raw materials; certain amounts of water and sulfuric acid are added; and the basic chromium sulfate is prepared by steps of reaction, curing, filtration, vacuum concentration, drying, and the like. The Cr2O3 content in the product is stabilized at 27%; the basicity is 30%-45%; the iron content is less than 0.1%. The whole process of the invention is short in flow, causes no discharge of toxic waste water, waste residues, and waste gas, and solves the problem of environment harm in the prior art.

Description

technical field [0001] The invention relates to a method for preparing basic chromium sulfate compound by using vanadium and chromium extraction slag, which belongs to the technical field of environmental protection. Background technique [0002] Preparation of vanadium pentoxide (V 2 o 5 ) process, due to the symbiosis of vanadium and chromium in most vanadium-titanium-magnetite resources, about 80-90% of vanadium-chromium enters the vanadium-titanium-magnetite concentrate during beneficiation, and chromium and vanadium are enriched in the same phase when smelting and extracting vanadium slag In vanadium slag, vanadium slag with high chromium content, Cr 2 o 3 With a content of 5-15%, it is essentially a secondary process mineral raw material enriched with vanadium and chromium. The process equipment for extracting chromium salt from chromite is similar to the vanadium pentoxide process and equipment, and can be used interchangeably (rotary kiln for vanadium extraction ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C01G37/08
CPCY02P10/20
Inventor 李自树徐欣叶宏杨虎操卫平
Owner 四川格瑞化工科技发展有限公司
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