A method for preparing titanium dioxide using external seed crystals
A technology of adding seeds and titanium dioxide, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems affecting the water consumption per ton of titanium dioxide and the production capacity per unit time, the uneven particle size distribution of hydrolyzed metatitanic acid, and the hydrolysis partiality. The problem of low washing efficiency of titanic acid can achieve good economic and social benefits, saving concentration costs, and excellent pigment performance.
Active Publication Date: 2018-08-07
XIANGYANG LOMON TITANIUM IND CO LTD
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[0004] Patent CN101555038A "Method for Preparing Titanium Dioxide by Hydrolysis" proposes: while the concentrated titanium solution is discharged and added to the bottom water, sodium hydroxide or potassium hydroxide solution or solid is continuously and uniformly added to the hydrolysis mixture as a regulator; titanium solution After the unloading is completed, metatitanic acid is obtained by hydrolysis, and titanium dioxide is obtained through subsequent processes; this method is a method of acid-base neutralization and forced hydrolysis, and its hydrolysis rate can reach 96.3-97.5, but using this method to prepare titanium dioxide The particle size distribution of the obtained hydrolyzed metatitanic acid is not uniform (forced hydrolysis nucleation, particle growth is difficult to control), and therefore the washing efficiency of the hydrolyzed metatitanic acid is low (generally pickling takes 100-150min, water washing takes 150- 210min), thus affecting the water consumption per ton of titanium dioxide and the production capacity per unit time, thereby affecting the production cost of titanium dioxide
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[0020] Adopt sulfuric acid method to produce titanium dioxide, wherein hydrolysis method comprises the following steps:
[0021] (1) Put a metered amount of 100±5g / L NaOH into the seed crystal preparation tank. When the hydrolyzed titanium solution is preheated to 77-80°C, turn on the stirring and steam valve of the seed crystal preparation tank, and then preheat the alkali solution Heat to 85°C; when the preheating temperature of the hydrolyzed titanium liquid reaches 85°C, open the hydrolyzed titanium liquid preheating tank and add the hydrolyzed titanium liquid discharge valve of the seed preparation tank, and control the opening of the discharge valve so that the hydrolyzed titanium liquid is in the Evenly add the seed crystal preparation tank and mix with the lye;
[0022] After adding the hydrolyzed titanium solution, close the discharge valve of the hydrolyzed titanium solution, open the steam valve of the seed crystal preparation tank at the same time, raise the temper...
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The invention relates to the production of titanium white powder production, and particularly relates to a method for preparing titanium white powder from high-concentration additional crystal seeds. Compared with the existing spontaneous crystal seed method, high-concentration additional crystal seed hydrolysis can be increased by 1.5%, normal water washing can be performed for primary washing and secondary washing, and the pulping Fe content can be also well controlled; and meanwhile, the high-concentration additional crystal seed hydrolysis material has a certain effect of improving pigment performance.
Description
technical field [0001] The invention relates to a production method for preparing titanium dioxide, which belongs to a method for preparing titanium dioxide by using high-concentration external seed crystals. Background technique [0002] At present, the industrial production of pigment titanium dioxide at home and abroad mainly adopts the sulfuric acid method and the chlorination method. In China, the sulfuric acid method is still the main method, which is divided into spontaneous seed crystal thermal hydrolysis and external seed crystal thermal hydrolysis. One of the key factors that determine the hydrolysis rate, the washing efficiency of metatitanic acid and the quality of pigment titanium dioxide are the hydrolysis conditions and hydrolysis operation, the quantity, quality and dispersion of the seed crystals formed in the initial stage of hydrolysis in the autogenous seed crystal hydrolysis process The situation plays a decisive role in the metatitanic acid structure, p...
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IPC IPC(8): C01G23/053
CPCC01G23/0534C01P2006/60C01P2006/62C01P2006/63C01P2006/64
Inventor曾小林卢慧军鞠浩
OwnerXIANGYANG LOMON TITANIUM IND CO LTD