Method for producing feed grade ferrous sulfate monohydrate from titanium pigment waste acid condensed slag

A technology of titanium dioxide waste acid and water ferrous sulfate, applied in the direction of ferric sulfate, etc., to achieve the effect of facilitating industrial production, saving resources and protecting the environment
CN101792187AActive Publication Date: 2010-08-04SICHUAN LOMON TITANIUM IND CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SICHUAN LOMON TITANIUM IND CO LTD
Publication Date
2010-08-04

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Abstract

The invention discloses a production method of feed grade ferrous sulfate monohydrate. Titanium white waste acid condensed slag is used as the raw material, and is subject to the processes of deacidification, pexitropy, separation, crystal transform and the like to produce the feed grade ferrous sulfate monohydrate, thereby realizing the comprehensive utilization of the titanium pigment waste acid condensed slag as the byproduct for the sulfuric acid method. The method comprises the following steps: mixing mother solutions generated in the ferrous sulfate monohydrate production processes by condensed slag and wet method, using iron powder to reduce the sulfuric acid content to 4% or so, slowly cooling and crystallizing the slurry to generatecoarse ferrous sulfate heptahydrate crystals, and separating impurities from the ferrous sulfate by using the particle size differences between the ferrous sulfate heptahydrate crystals and the impurity particles, thereby purifying the ferrous sulfate in the condensed slag and widening the application field of the condensed slag. The ferrous sulfate heptahydrate is transformed into ferrous sulfate monohydrate at high temperature to produce the qualified feed grade ferrous sulfate monohydrate in huge market demands, thereby changing the waste slag into valuable resources.
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Description

technical field

[0001] The present invention relates to a production method of feed grade ferrous sulfate monohydrate, in particular, relates to a method of producing feed grade ferrous sulfate monohydrate using the waste acid concentrated slag produced in the production process of sulfuric acid titanium dioxide, which belongs to titanium White powder production technology field Background technique

[0002] In the production process of sulfuric acid titanium dioxide, the hydrolyzed metatitanic acid slurry is filtered to obtain a filtrate containing a large amount of impurities, which is called waste sulfuric acid, and the waste sulfuric acid contains 20-30% dilute sulfuric acid. For the treatment of waste acid, sulfuric acid titanium dioxide manufacturers generally use concentration or acid compounding to increase the concentration of sulfuric acid and reduce impurities in the acid, which is convenient for the recycling of waste acid. At present, most factories increase th...

Claims

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