Method for purifying titanium solution

A purification method and technology for titanium liquid, applied in the field of titanium liquid purification, can solve the problems of little waste acid, waste water research, etc., and achieve the effects of reducing the number of washing stages, high product quality, and reduced washing times.

Inactive Publication Date: 2011-09-21
沙立林 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, domestic and foreign researches on the treatment of waste acid from sulfuric acid titanium dioxide production and hydrolysis mainly focus on the treatment of waste acid, and seldom research on the source of waste acid and waste water

Method used

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  • Method for purifying titanium solution
  • Method for purifying titanium solution
  • Method for purifying titanium solution

Examples

Experimental program
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Effect test

Embodiment 1

[0053] The preparation of embodiment 1 high titanium hydrochloric acid leaching residue

[0054] According to the hydrochloric acid direct leaching method disclosed in Chinese patent application 200910306494.5, high titanium hydrochloric acid leaching residue is prepared, and the process parameters are as follows:

[0055] A, mixing ilmenite and hydrochloric acid, the ratio of ilmenite quality (grams) to the volume (ml) of hydrochloric acid solution is 1: 2.5~5, the concentration of hydrochloric acid is 18%~30%, heating to 70 ℃~150 ℃ for leaching Reaction, the reaction time is 1-8 hours;

[0056] B. Filtrate the reaction solution and dry the obtained solid, which is the acid-soluble pertitanium hydrochloric acid leaching residue; when drying in step B, control the temperature below 350° C., and the drying time is 4-8 hours.

[0057] Detailed raw material proportioning and reaction conditions are as follows in the present embodiment:

[0058] 1. Measure 45 liters of 20% hydro...

Embodiment 2

[0068] The preparation of embodiment 2 titanium liquid

[0069] The sulfuric acid method is used to prepare titanium solution by using high titanium hydrochloric acid leaching slag as raw material, which can be carried out according to the method disclosed in Chinese patent application 200910306494.5. Specifically, the process parameters in the present embodiment are as follows:

[0070] with 72% TiO 2 The high titanium hydrochloric acid leaching residue (prepared by the method of Example 1) was 20Kg, and 19.4 liters of 98% concentrated sulfuric acid was added, and the weight ratio of the high titanium hydrochloric acid leaching residue to 100% concentrated sulfuric acid was 1: 1.75. Stir well and start heating. Heating to about 175°C with stirring allowed the reaction to proceed spontaneously. After continuing to stir for about 5 minutes, the reactant formed a viscous solid mixture, and the mixture was aged at 180° C. and kept at the temperature for 4 hours. Cool to room ...

Embodiment 3

[0073] The purification of embodiment 3 titanium liquid

[0074] Prepare titanium solution according to Example 2, take 2 liters of titanium solution, and its chemical composition is shown in Table 3. First, 1.5 equivalents (relative to ferrous ions) of chlorine gas is introduced into the titanium solution to oxidize ferric ions into ferric ions. After being oxidized by chlorine gas, the chemical composition of the titanium solution is shown in Table 4.

[0075] Chemical composition of titanium liquid after table 4 oxidation

[0076]

[0077] In the oxidized titanium solution, add 360 milliliters of 11 molar hydrochloric acid to complex ferric ions. After adding hydrochloric acid, the chemical composition of the titanium solution is shown in Table 5.

[0078] The chemical composition of titanium liquid after adding hydrochloric acid in table 5

[0079]

[0080] 2.36 liters of titanium solution added with hydrochloric acid is fully mixed and contacted with 1 liter of ...

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Abstract

The invention belongs to the technical field of the production of titanium dioxide. The invention specifically relates to a method which is utilized for purifying a titanium solution, which is treated through acidolysis, dissolution and filtration, in titanium dioxide production by sulfuric acid method. Through the method, wastwater discharge and waste acid discharge are reduced greatly. The method comprises the following steps: A, ferrous ions in a titanium solution is oxidized into ferric irons; B, hydrochloric acid or hydrogen chloride gas is fed into the titanium solution to promote complexation of the ferric irons; C, complexed ferric iron produced by the step B is extracted to enter an organic phase; and D, the organic phase is separated from the titanium solution and thus purified titanium solution is obtained. Through the method for purifying titanium solution, wastwater discharge and waste acid discharge are reduced greatly and the product quality of titanium dioxide is improved.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production, and in particular relates to a method for purifying titanium liquid obtained after acidolysis, dissolution and filtration in the sulfuric acid titanium dioxide production process. Background technique [0002] Chlorination and sulfuric acid are the two main processes for producing titanium dioxide in the world today. The production capacity ratio of global chloride titanium dioxide and sulfuric acid titanium dioxide is about 56:44. The production of titanium dioxide by chloride method is mainly concentrated in Europe and America, and the production process of titanium dioxide by sulfuric acid method is mainly concentrated in the Asia-Pacific region. Compared with the chlorination method, the sulfuric acid method has the disadvantages of long process flow, low degree of automation, poor product quality, large discharge of "three wastes" and relatively high infrastructure investment. Am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/12C22B3/40
CPCY02P10/20
Inventor 陈树忠
Owner 沙立林
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