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Method for preparing high-purity ferrous sulfate heptahydrate by using sulfuric acid method titanium dioxide wastewater

A technology of titanium white wastewater and ferrous sulfate, which is applied in the direction of ferric sulfate, can solve the problems of unreasonable, low wastewater treatment effect, lack of reasonable development of valuable ferrous sulfate solution, etc., to achieve improved utilization rate, considerable economic benefits, The effect of perfecting the process chain of titanium dioxide wastewater treatment

Inactive Publication Date: 2019-12-06
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of the current unreasonable treatment methods for titanium dioxide wastewater, and in most cases, the comprehensive utilization of wastewater filter residues is considered, and the lack of reasonable development of valuable ferrous sulfate solution results in low wastewater treatment effectiveness, so the present invention treats wastewater method for rational and scientific improvement

Method used

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  • Method for preparing high-purity ferrous sulfate heptahydrate by using sulfuric acid method titanium dioxide wastewater

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Experimental program
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Effect test

Embodiment 1

[0037] A method for preparing high-purity ferrous sulfate heptahydrate with sulfuric acid titanium dioxide wastewater, comprising the following steps:

[0038] (1) Preparation of low-concentration and high-purity FeSO 4 Solution: While blowing air, turn on the mechanical stirring, pump the titanium dioxide wastewater into the reaction tank, add calcium carbonate powder slurry at the same time, adjust to pH=4.8, stop stirring, and separate the solid and liquid through the diaphragm filter press to obtain low Concentration High Purity FeSO 4 solution and titanium white gypsum; low concentration high purity FeSO 4 Solution indicator: TiOSO 4 =0.05g / l; FeSO 4 =42g / L; index of titanium white gypsum: moisture =31.5%, TiO(OH) 2 = 1.8%, SO 3 = 42.5%, pH = 6.5;

[0039] (2) Preparation of iron-rich red gypsum: low-concentration and high-purity FeSO 4 The solution is pumped into the reaction tank, while blowing air, turn on mechanical stirring, add lime milk, adjust to pH=8.2, st...

Embodiment 2

[0047] A method for preparing high-purity ferrous sulfate heptahydrate with sulfuric acid titanium dioxide wastewater, comprising the following steps:

[0048] (1) Preparation of low-concentration and high-purity FeSO 4 Solution: While blowing air, turn on mechanical stirring, pump titanium dioxide wastewater into the reaction tank, add calcium carbonate powder slurry at the same time, adjust to pH = 4.7, stop stirring, and separate solid and liquid through a diaphragm filter press to obtain low Concentration High Purity FeSO 4 solution and titanium white gypsum; low concentration high purity FeSO 4 Solution indicator: TiOSO 4 =0.06g / L; FeSO 4 =45g / L; index of titanium white gypsum: moisture=30.5%, TiO(OH) 2 = 1.9%, SO 3 = 42%, pH = 6.4;

[0049] (2) Preparation of iron-rich red gypsum: low-concentration and high-purity FeSO 4 Pump the solution into the reaction tank, start the mechanical stirring while blowing air, add lime milk, adjust to pH = 7.8, stop stirring, and ...

Embodiment 3

[0057] A method for preparing high-purity ferrous sulfate heptahydrate with sulfuric acid titanium dioxide wastewater, comprising the following steps:

[0058] (1) Preparation of low-concentration and high-purity FeSO 4 Solution: While blowing air, turn on the mechanical stirring, pump the titanium dioxide wastewater into the reaction tank, add calcium carbonate powder slurry at the same time, adjust to pH=4.9, stop stirring, and separate the solid and liquid through the diaphragm filter press to obtain low Concentration High Purity FeSO 4 solution and titanium white gypsum; low concentration high purity FeSO 4 Solution indicator: TiOSO 4 =0.04g / L; FeSO 4 =52g / L; index of titanium white gypsum: moisture=31%, TiO(OH) 2 = 1.7%, SO 3 = 41.5%, pH = 6.6;

[0059] (2) Preparation of iron-rich red gypsum: low-concentration and high-purity FeSO 4Pump the solution into the reaction tank, start the mechanical stirring while blowing air, add milk of lime, adjust to pH = 7.9, stop ...

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for preparing high-purity ferrous sulfate heptahydrate by using sulfuric acid method titaniumdioxide wastewater, wherein the method comprises: preparing a low-concentration high-purity FeSO4 solution, preparing iron-rich red gypsum, preparing a high-concentration FeSO4 acidic solution, and preparing high-purity FeSO4.7H2O. According to the method, the low-concentration high-purity FeSO4 solution is prepared by controlling the process and the end point of the reaction; the preparation method of the high-concentration FeSO4 acidic solution comprises: dissolving iron-rich red gypsum with concentrated waste acid, adding iron powder, and adjusting Ti<3+> to prepare the high-concentrationFeSO4 acidic solution; the preparation method of the high-purity FeSO4.7H2O comprises: carrying out freezing crystallization, carrying out centrifugal separation, and washing to prepare the high-purity FeSO4.7H2O; and the titanium dioxide-containing gypsum produced by neutralizing with calcium carbonate stone powder can be used as a retarder in a cement plant. According to the present invention, the method has characteristics of simple process, stable treatment effect, low equipment investment, no secondary pollution and low treatment cost.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method for preparing high-purity ferrous sulfate heptahydrate from titanium white waste water of a sulfuric acid process. Background technique [0002] At present, most domestic titanium dioxide factories adopt the sulfuric acid method for production, and a large amount of by-products of ferrous sulfate heptahydrate will be produced in the production process, and the output ratio of ferrous sulfate heptahydrate / titanium dioxide is as high as 3.0-3.5t / t. Its FeSO 4 ·7H 2 O content <95%, TiOSO 4 Content = 0.3 ~ 0.7%, and contains Mn 2+ , Mg 2+ 、Al 3+ Due to the high content of impurities, the quality of ferrous sulfate heptahydrate / titanium dioxide is not high. [0003] Ferrous sulfate heptahydrate, a by-product of the sulfuric acid process, is made of ferrous sulfate heptahydrate. The raw material before freezing is titanium liquid after acid hydrolysis, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14C04B22/14C04B103/22
CPCC01G49/14C01P2006/80C04B22/146C04B2103/22
Inventor 伍佳
Owner CNMC GUANGXI PGMA