SU722925A1 - Method of preparing titanium dioxide anatase - Google Patents

Description

This invention relates to the field of producing titanium dioxide anatase moai (}, which is used by other companies in the paint industry. Known methods for producing anatase titanium dioxide are used in the process of hydrolysis of titanyl sulphate solutions that result in salt treatment resulting from hydrolysis of hydrated titanium and titanium sulphate solutions resulting from salt processing resulting from hydrolysis of hydrated titanium sulfate solutions resulting from salt processing that formed during hydrolysis of hydrated titanium sulfate solutions. , magnesium and lead 1 and 2. The disadvantage of these methods is the low degree of separation of titanium in the hydrolysis step and Known titanyl sulfate solutions A known method for the preparation of anatase titanium dioxide involves decomposition of a titanium-containing raw material with sulfuric acid, hydrolysis of the resulting solution of titanyl sulfate, 4mluration, washing the hydrolysis product and its salt treatment in the presence of potassium sulfate, with the addition of phosphoric acid to the hydrolysis product and the addition of phosphoric acid to the hydrolysis product in the presence of potassium sulfate, with the addition of phosphoric acid to the hydrolysis product and the addition of phosphoric acid to the hydrolysis product in the presence of potassium sulphate in the presence of phosphoric acid in the presence of phosphoric acid; -1 wt.% And calcination of the product after salt treatment 3. The disadvantage of this method is the low yield of titanium dioxide (not exceeding 95-96%) due to incomplete hydrolysis of titanosulfate x solutions and loss of titanium with hydrolytic acid. The purpose of the invention is to increase the yield of anatase titanium dioxide. The goal is achieved by obtaining titanium dioxide by anatase by hydrolysis of the titanyl sulfate solution, filtration of the hydrolysis product, its salt treatment in the presence of potassium sulfate and calcination, introduction of phosphoric acid into the hydrolysis product, phosphoric acid (juric acid is introduced into the hydrolysis product before it is filtered 10 -4 ° C. Moreover, (| xx: (})) oric acid is taken in an amount of 1.5-4 wt.% Based on 100%. In addition, potassium sulfate is used in an amount of 1: -2 wt.% .

Example. Titanylsuphatic / solution, obtained as a result of p, chewed concentrates containing wax, ironic ilmenite, with sulfuric acid, is subjected to a thermogram. Then, in 1OO ml of hydrolysis containing 20 O g / l of metatitanic acid and 6.5 g / l of dissolved titanium, 0.21 ml of phosphoric acid HjPO, corresponding to 1.5% by weight of pure, is filtered at 40 ° C, the reaction mixture is filtered, process the hydrolysis product with potassium sulfate in an amount of 1 wt.% and calcined at.

The resulting product contains 95–3% titanium dioxide anatase, has a pH of 6.5, a whiteness of 96.3%, a disintegration capacity of 1240, and contains 0.25% of water-soluble salts. The product yield in the hydrolysis step is 99.5%.

Example 2. In the hydrolysis product of the titanyl sulfate solution of size 1, 0.55 ml of 85%, at 1 ° C, which corresponds to 4% by weight of pure acid, is introduced. Next, the reaction mixture is filtered, treated with 2 wt.% Potassium sulfate and calcined at 95 ° C.

The obtained anatase titanium dioxide with a Ti Og content of 94.1% has a whiteness of 96.2%, a disinfecting effect of 11220, a pH of 7.5, and a content of water-soluble salts of 0.28%.

i.

 method provides

The yield of titanium dioxide at the stage of hydrolysis is up to 99.5–99.7%.

Claims (3)

1. Method of obtaining anatase titanium dioxide, including hydrolysis of titanyl-lipoplate solution, filtration of the hydrolysis product, its salt treatment in the presence of potassium sulfate and alkalization, the introduction of phosphoric acid hydrolysis into the product, which differs in that: with an increase in the yield of the target product, phosphoric acid is introduced into the hydrolysis product before it is filtered at 10-40 ° C, 2. The method according to claim 1, characterized in that the phosphoric acid take in the amount of 1.5-4 wt.% in terms of 100%. 3. The method according to claim 1, characterized in that the potassium sulfate is used in an amount of 1-2 wt.%. Information sources, taken into account in the examination 1. For Japan No. 48-854, cl. 24 A 2, 1973. 2. The patent of Germany No. 1112802, cl. 2217, 1972. 3. Patent Czechoslovakia No. 139924, cl. 22 f 7, 1971.