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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

Active Publication Date: 2010-08-04
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And directly utilize waste acid concentration slag to produce feed grade ferrous sulfate monohydrate and there is no relevant report yet

Method used

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

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Embodiment 1

[0038] The process flow chart of this embodiment refers to the appended figure 1 , including the following process steps:

[0039] (1) concentrated slag acid reduction:

[0040] In the FRP reactor, add 4m 3 Ferrous sulfate monohydrate precipitates the mother liquor (7.18% of iron content, 2.34% of acid content) that crystallization produces, under stirring state, add 6 tons of particle diameters again and be the concentrated slag of titanium white waste acid of 2~20 μ m (Fe16%, H 2 SO 4 14%), mix the concentrated slag with the mother liquor, control the specific gravity of the slurry to 1.2, raise the temperature to 60-70°C, turn on the fan, and then slowly add 320kg of iron powder. The iron powder addition time is about 3 hours. After the iron powder reaction is completed, then join 2m 3 Wet ferrous sulfate monohydrate mother liquor, and maintain the temperature. At this time, the iron content of the slurry is 13.01%, and the acid content is 3.96%.

[0041] (2), coolin...

Embodiment 2

[0046] The process flow chart of this embodiment refers to the appended figure 1 , including the following process steps:

[0047] (1) concentrated slag acid reduction:

[0048] In the FRP reactor, add 4m 3 The mother liquor (7.18% of iron content, 2.34% of acid content) produced by ferrous sulfate monohydrate precipitation crystallization, under stirring state, add 6 tons of titanium white waste acid concentration slag (Fe16%, H 2 SO 4 14%), mix the concentrated slag with the mother liquor, control the specific gravity of the slurry to 1.4, raise the temperature to 80-90°C, turn on the fan, and then slowly add 200kg of iron powder. The iron powder addition time is about 2 hours. After the iron powder reaction is completed, add another 2m 3 Wet ferrous sulfate monohydrate mother liquor, and maintain the temperature. At this time, the iron content of the slurry is 12.36%, and the acid content is 5.35%.

[0049] (2), cooling crystallization, separation:

[0050] The slur...

Embodiment 3

[0054] The process flow chart of this embodiment refers to the appended figure 1 , including the following process steps:

[0055] (1) concentrated slag acid reduction:

[0056] In the FRP reactor, add 6m 3 The mother liquor (7.18% of iron content, 2.34% of acid content) produced by ferrous sulfate monohydrate precipitation crystallization, under stirring state, add 6 tons of titanium white waste acid concentration slag (Fe16%, H 2 SO 4 14%), mix the concentrated slag with the mother liquor, control the specific gravity of the slurry to 1.2-1.4, raise the temperature to 50-60°C, turn on the fan, and then slowly add 390kg of iron powder. The iron powder addition time is about 4 hours, and the iron powder reaction is completed. After that, add another 2m 3 Wet ferrous sulfate monohydrate mother liquor, and maintain the temperature. At this time, the iron content of the slurry is 12.47%, and the acid content is 3.04%.

[0057] (2), cooling crystallization, separation:

[...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14
Inventor 周晓葵文军邓伯松陈吕荣李曹李伟高华
Owner SICHUAN LOMON TITANIUM IND CO LTD
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