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A kind of preparation method of titanium dioxide

A technology of titanium dioxide and reducing agent, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high cost and large consumption of iron powder, and achieve the effect of increasing production efficiency and reducing production cost.

Active Publication Date: 2016-03-09
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of large consumption of iron powder and high cost in the existing sulfuric acid method for producing titanium dioxide, and to provide a method for preparing titanium dioxide with small consumption of reducing agent and low cost

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0010] The present invention provides a method for preparing titanium dioxide, which comprises: sequentially subjecting titanium-containing materials to acidolysis treatment, leaching treatment, reduction treatment, sedimentation treatment, hydrolysis treatment and calcination treatment, wherein, in the acidolysis treatment and During the leaching treatment, the compressed air is introduced into the reaction system, and after the leaching treatment is completed, the introduction of the compressed air is stopped, and under stirring conditions, the material after the leaching treatment is contacted with the reducing agent, wherein , with TiO 2 In other words, the molar ratio of the titanium element contained in the material after the leaching treatment to the reducing agent is 1: (0.06-0.95).

[0011] The inventor of the present invention also finds that because the material after acidolysis can be solidified in the aging process, it is inappropriate to directly install a stirri...

Embodiment 1

[0030] This example is used to illustrate the preparation method of the titanium dioxide of the present invention.

[0031] 25000kg of titanium concentrate particles (as TiO 2 Calculated, the titanium content is 46% by weight) and sulfuric acid solution (44117kg, concentration is 85% by weight) join in the acidolysis pot together, pass into the compressed air in the reaction mass (feed rate is 1200m 3 / h), and reacted at 160°C for 25min, then aged for 1.5h (at this time the temperature was 120°C), using 70m 3 Water is diluted and leached, and the leached material is sent into the reduction tank (the volume of the material sent into the reduction tank is 85m 3 , and with TiO 2 Calculated, the concentration of titanium is 130g / L). At 65°C and 15rpm / min mechanical stirring speed, add 500kg of 80-mesh iron powder and react for 100min, then add 80kg of iron powder and react for another 30min, the content of trivalent titanium in the obtained titanium solution is 1.2g / L. The r...

Embodiment 2

[0033] This example is used to illustrate the preparation method of the titanium dioxide of the present invention.

[0034] 20000kg of titanium concentrate particles (as TiO 2 Calculated, the titanium content is 52% by weight) and sulfuric acid solution (36213kg, concentration is 84% ​​by weight) and joins in the acidolysis pot together, passes into the compressed air in the reaction mass (feed rate is 1400m 3 / h), and reacted at 180°C for 17min, then aged for 2h (at this time the temperature was 126°C), using 60m 3 Water is diluted and leached, and the leached material is sent into the reduction tank (the volume of the material sent into the reduction tank is 74m 3 , and with TiO 2 Calculated, the concentration of titanium is 135g / L). At 70°C and 20rpm / min mechanical stirring speed, add 550kg of 100 mesh iron powder and react for 50min, then add 75kg of iron powder and react for another 30min, the content of trivalent titanium in the obtained titanium solution is 1g / L . ...

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Abstract

The invention discloses a preparation method of titanium dioxide. The method comprises the following step: sequentially carrying out acidolysis treatment, leaching treatment, reduction treatment, settling treatment, hydrolytic treatment and calcining treatment on a titanium-containing material, wherein the method specially comprises the following steps: in the acidolysis treatment and the leaching treatment, introducing compressed air into a reaction system; after the leaching treatment, stopping introducing the compressed air and carrying out contact reaction on the material after the leaching treatment and a reducing agent under stirring condition, wherein the molar ratio of titanium contained in the material after the leaching treatment and the reducing agent is 1:(0.06-0.95). By adopting the method disclosed by the invention, the use level of the reducing agent can be lowered, and titanium dioxide with high whiteness can be obtained.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide. Background technique [0002] In the process of producing titanium dioxide (titanium dioxide) by the sulfuric acid method, since the hydrolysis pH of ferric iron is close to that of titanium liquid, if there are ferric ions in the titanium liquid, it will be produced during the hydrolysis of titanium liquid in the production process. More hydrolysis products of ferric iron are adsorbed on the surface of titanium dioxide and are difficult to wash off, which affects the whiteness of the final titanium dioxide product produced. Usually, in order to prevent the ferrous ions in the titanium solution after acidolysis from being oxidized into ferric ions, it is required that the titanium solution contains a certain concentration of trivalent titanium ions, so that the iron in the subsequent process links can be maintained in the form of ferrous ions. form exists. The traditional method of re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053C01G23/08
Inventor 吴健春路瑞芳王斌
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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