SU371264A1 - - Google Patents

Description

(54) METHOD FOR PRODUCING TITANIUM DIOXIDE

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The invention relates to a method for producing titanium dioxide used in various industries, in particular paint and varnish.

A known method for producing TiOn consists in decomposing the ilmenite concentrate with sulfuric acid in addition to the complex of the forming agent in the resulting sulphate solution of titanium, in hydrolyzing the solution, followed by washing and calcining titanium hydroxide.

However, with the known method there is a high content of iron in two% titanium oxide, which reduces its optical properties (degree of whiteness), increases the consumption of the complexing agent and water for washing.

The proposed method differs from the known one in that the complex-forming substance in the form of O, O1-O, O5 mol of solution is added at the washing stage. This

reduces the iron content in titanium dioxide, which increases its optical properties, reduces the consumption of the comp: lexing agent and water for washing and makes it possible to eliminate the bleaching process.

So, when titanium dioxide is produced by a known method, the degree of whiteness is 93-95%, and according to the proposed method - 96-97%.

In the proposed method, sodium salicylate or lactic acid, or Trilon B, or mannitol is used as a complexing agent.

Example 1. Titanium hydroxide paste obtained from the Lemni concentrate with an iron content of 0, 1-O, 3% in terms of Fe-Oj (relative to

Claims (2)

Ti Od) is treated with O, O5 mol with a solution of Trilon B. The amount of paste is introduced in such a way as to obtain a suspension with a solid concentration of TiOg 18 O2OO g / l. The resulting suspension with a pH of 1-2 is kept for 2 hours with stirring, then filtered, washed with distilled water at the rate of 0.3 l / kg TiOn. Example 2. A titanium hydroxide paste obtained by the Lemny concentrator, with an iron content in terms of FftoO, O, 1-O, 3% (with respect to TiO is treated with 0.05 mol of lactic acid solution. The amount of paste is introduced as in Example 1 the suspension with pH 1-2 is kept under these conditions with stirring for 2 hours.The suspension is then filtered, the precipitate is washed with distilled water in an amount of O, 3 l / kg TiOg. Example 3. Titanium hydroxide paste, obtained from Lemni concentrate, iron content in terms of FegO, 0,1-O, 3% (relative to Ti Og) treated with 0.01 mol solution of sodium sysilicate. The amount of paste is introduced according to example 1. After stirring the paste, the resulting suspension is adjusted to pH 1-2. The suspension is repulped for 2 hours, then filtered, the precipitate is washed with distilled water at the rate of 0, 3 / kg riOg. Example 4. A titanium hydroxide paste obtained from Lemny concentrate with an iron content in terms of 2 0.1-0.3% (relative to 0.05 mol of a minitol solution is treated. The amount of paste is introduced according to Example 1. After stirring, the pH of the suspension is adjusted to 1-2. The suspension is repulped for 2 hours, then filtered, and the precipitate is washed with distilled water at a rate of 0.3 l / kg TiOg. Formula 1: A method for producing titanium dioxide by decomposing an ilmenite concentrate with sulfuric acid, hydrolysis of a solution of titanium sulphate, washing and calcining titanium hydroxide using additives complexing agents, about t l ichayuschy. so that, in order to simplify the process and enhance the optical properties of the product, the complexing agent is added in the form of 0.01-0.05 mol of solution at the washing stage. 2. A method according to claim 1, characterized in that sodium salicylate or lactic acid, or Trilon B, or mannitol is used as a complexing agent.