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Method for purifying ferrous sulfate heptahydrate byproduct in titanium white production

A ferrous sulfate and purification method technology, applied in the direction of ferric sulfate, can solve the problems of low recovery rate, high heavy metal content, unsatisfactory treatment effect, etc., and achieve the effect of low treatment cost, simple process and short process flow

Active Publication Date: 2011-02-16
LOMON BILLIONS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the known treatment process, the treatment effect is not very satisfactory, such as the process flow for purifying titanium dioxide ferrous sulfate proposed by Japan Imperial Chemical Industry Co., Ltd., that is, adding alkali to the ferrous sulfate solution to separate the titanium water. Ten times of repeated refining and purification; the acid leaching purification process of Wuhan 824 Factory, the titanium removal result was 161 ppm, and the removal rate of other impurities was not ideal, and the recovery rate was low; the heavy metal content in the report of Chinese patent CN94105891.3 was still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add ferrous sulfate and water, the by-products of titanium dioxide, into the reactor at a mass ratio of 1:1.5, heat directly, and stir to dissolve; after the dissolution is complete, slowly add a 40-mesh sieve with an effective iron content of 89% and the remaining content is less than 5%. reduced iron powder until the pH value is 3-4. Keep boiling until a large amount of white flocs are formed. Add a little phosphoric acid and continue heating for 10-20 minutes. After indirect cooling to 80-90 degrees Celsius with water, add ferrous sulfide and continue stirring for 30-60 minutes. Check the pH value, add 93% sulfuric acid (to ensure the purity of sulfuric acid), so that the pH value of the solution is between 1-2. Add 1‰ cationic modified polyacrylamide according to 0.001-0.006% of the total weight of ferrous sulfate, stir rapidly for 3-5 minutes, then stir slowly for 5-8 minutes until a large number of flocs are formed, press filter, pump into In the vacuum crystal...

Embodiment 2

[0024] Add ferrous sulfate and water, the by-products of titanium dioxide, into the reactor at a mass ratio of 1:1.5, heat directly, stir and dissolve; after the dissolution is complete, slowly add 40-mesh sieve with an effective iron content of 88% and the remaining content is less than 5%. reduced iron powder until the pH value is 3-4. Keep boiling until a large amount of white flocs are formed. Add a little phosphoric acid with a concentration of 20%, and continue heating for 10-20 minutes. After indirect cooling to 80-90 degrees Celsius with water, add ammonium sulfide and continue stirring for 30-60 minutes. Check the pH value, add 93% sulfur to make the pH value of the solution between 1-2. Add 1‰ anion-modified polyacrylamide according to 0.001-0.006% of the total weight of ferrous sulfate, stir rapidly for 3-5 minutes, then stir slowly for 5-8 minutes until a large number of flocs are formed, press filter, pump into In the vacuum crystallizer, after the temperature ...

Embodiment 3

[0026] Add ferrous sulfate and water, the by-products of titanium dioxide, into the reactor at a mass ratio of 1:1.5, heat directly, and stir to dissolve; after the dissolution is complete, slowly add 40-mesh sieve with an effective iron content of 100% and the remaining content is less than 5%. reduced iron powder until the pH value is 3-4. Keep boiling until a large amount of white flocs are formed. Add a little phosphoric acid and continue heating for 10-20 minutes. After indirect cooling with water to 80-90 degrees Celsius, add sodium sulfate and continue stirring for 30-60 minutes. Check the pH value, add 93% sulfuric acid (to ensure the purity of sulfuric acid), so that the pH value of the solution is between 1-2. Add 1‰ cationic modified polyacrylamide according to 0.001-0.006% of the total weight of ferrous sulfate, stir rapidly for 3-5 minutes, then stir slowly for 5-8 minutes until a large number of flocs are formed, press filter, pump into In the vacuum crystalli...

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Abstract

The invention discloses a method for purifying a ferrous sulfate heptahydrate byproduct in titanium white production, which comprises the following steps of: (1) adding a solvent into the byproduct in titanium white production, heating to the temperature of between 65 and 105 DEG C, and stirring for dissolution to prepare saturated solution; (2) adding iron powder at the temperature of between 95 and 105 DEG C; (3) adding phosphoric acid and heating at the temperature of between 95 and 105 DEG C for 10 to 20 minutes; (4) cooling the mixture to the temperature of between 80 and 90 DEG C, adding sulfide, stirring for 30 to 60 minutes, and adding sulphuric acid; (5) adding polyacrylamide, stirring for 3 to 10 minutes, precipitating, and filtering to obtain ferrous sulfate solution; and (6) cooling and crystallizing the ferrous sulfate solution, filtering and separating to prepare ferrous sulfate crystals. The content of the ferrous sulfate heptahydrate prepared is over 20.1 percent, and the content of titanium, lead, cadmium, chromium and magnesium is less than 10ppm based on the lead. The process is simple and the process flow is short.

Description

technical field [0001] The invention relates to the technical field of treatment of titanium dioxide by-product solid waste, in particular to a purification method of titanium dioxide by-product ferrous sulfate heptahydrate. Background technique [0002] Ferrous sulfate heptahydrate is the main raw material for the production of feed (food, pharmaceutical) grade ferrous monohydrate, magnetic powder, and high-purity iron oxide pigments. There are mainly two ways for the source of ferrous sulfate, one is to use iron sheet and sulfuric acid to react to produce ferrous sulfate, which has the advantages of short process flow and high product purity, but consumes sulfuric acid and iron sheet, and the production cost is high; another way is chemical or Ferrous sulfate, a by-product of the metallurgical industry, has the advantages of not consuming resources and low cost, but the disadvantage is that the product has low purity. In the production process of sulfuric acid titanium di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14
Inventor 杨民乐陈建立陈彦君赵波
Owner LOMON BILLIONS GRP CO LTD
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