Method for preventing scaling of controlled filtration equipment in titanium dioxide production process

A technology for controlling the filtration and production process, which is applied in the direction of chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of controlling the fouling and clogging of filtering equipment, and achieve the effect of solving fouling and clogging, simple process and easy promotion

Inactive Publication Date: 2017-05-10
SICHUAN LOMON TITANIUM IND CO LTD
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Problems solved by technology

[0014] In order to solve the problem of fouling and clogging of the control filter equipment, the invention provides a method for preventing the fouling of the control filter equipment during the production process of titanium dioxide

Method used

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  • Method for preventing scaling of controlled filtration equipment in titanium dioxide production process

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Embodiment 1

[0027] Control filtration equipment One set of plate and frame filter press, with a filtration area of ​​220 square meters (filter plate specification 1.5m×1.5m), add 500kg of diatomaceous earth and 10 square meters of filtrate (20°C) for beating and cloth after iron removal and crystallization, and then put After iron removal and crystallization, the filtrate is indirectly preheated to 77°C with a steam coil, and the filtrate (77°C) after preheating and iron removal crystallization is controlled and filtered to ensure that the titanium liquid-solid content after controlled filtration is less than or equal to 30ppm. When the overall pressure of the filter press When it reaches 0.4MPa, the filter-aid layer is replaced, and it is used reciprocally. The filter cloth is replaced every 15 days, and a filter plate is taken every 10 days, and the scale is thoroughly cleaned and weighed. The solid phase to be leached is added with water and the leaching temperature is 75°C).

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Abstract

The invention relates to a method for controlled filtration in titanium dioxide production via sulfuric acid method, in particular to a method for preventing scaling of controlled filtration equipment in titanium dioxide production process; the method comprises the steps of (1) preheating post-crystallization filtrate, obtained by removing iron sulfate heptahydrate crystal via crystallization, to a temperature above extracting temperature of solid matter to be extracted to obtain pre-heated filtrate, wherein the solid matter to be extracted is obtained by acidolysis of ilmenite; (2) performing controlled filtration on the preheated filtrate. The method has the advantages that the problem that a filter plate is blocked due to scaling during controlled filtration can be thoroughly solve; production efficiency of the whole titanium dioxide production process is improved; the method is simple and is easy to popularize.

Description

technical field [0001] The invention relates to a production method of sulfuric acid titanium dioxide, in particular to a control filtration method in the production process of sulfuric acid titanium dioxide. Background technique [0002] Titanium dioxide scientific name titanium dioxide (TiO 2 ) has the best opacity, best whiteness and brightness, and is considered to be the most excellent white pigment in the world. It is widely used in coatings, plastics, papermaking, printing ink, chemical fiber, rubber, ceramics, cosmetics, food and medicine industries. Its main production methods are chloride method and sulfuric acid method. At present, the main production technology in China is sulfuric acid method. . [0003] The process of producing titanium dioxide by sulfuric acid method is as follows: [0004] A. Acid hydrolysis of ilmenite: using ilmenite as raw material, acidolysis with sulfuric acid to obtain TiOSO 4 and ferrous sulfate to be leached solid phase; [0005]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/0532
Inventor 代堂军姚恒平朱全芳孙润发
Owner SICHUAN LOMON TITANIUM IND CO LTD
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