Comprehensive Utilization Method of Titanium Chloride Slag and Its Filtrate in Chlorination Titanium Dioxide Process

Abstract

The invention relates to a method for treating byproducts in chlorination-process technologies for titanium dioxide powder, and particularly discloses a method for comprehensively utilizing titanium chloride residues and filter liquid thereof in chlorination-process technologies for titanium dioxide powder. The method includes dissolving the titanium chloride residues in diluted hydrochloric acid to obtain acidic solution and neutralizing the acidic solution by the aid of sodium hydroxide solution; carrying out pH (potential of hydrogen) regulation, deionized water treatment and multi-step filter processes to obtain the filter liquid with sodium chloride which is a main component; feeding the obtained filter liquid to brine working procedures of chlorine-alkali systems and carrying out re-saturation treatment on the filter liquid to obtain raw materials for chlorine-alkali production. The method has the advantages that metal reducing agents do not need to be added into the acidic solution with the titanium chloride residues; steps for carrying out evaporative crystallization on the filter liquid can be omitted; the ultimately obtained filter liquid can be used as the production raw materials for chlorine-alkali technologies, and accordingly the chlorination-process technologies for the titanium dioxide powder can be organically combined with the chlorine-alkali production technologies.

Description

technical field [0001] The invention relates to a production process of titanium tetrachloride in a chlorination titanium dioxide process, in particular to a treatment method for by-products produced in the production process of titanium tetrachloride. Background technique [0002] At present, the methods for producing titanium dioxide mainly include sulfuric acid method and chloride method. Due to the long process of the sulfuric acid method, serious pollution and poor product quality, it was gradually replaced by the chlorination method. [0003] In the current production of titanium dioxide by chloride method, its main process is: [0004] a. Mix the titanium raw material (such as: high titanium slag) and the reducing agent (such as: petroleum coke) evenly and send it into the chlorination furnace, inject chlorine gas to carry out boiling chlorination at the temperature of 800℃~1000℃; [0005] b. Separating and purifying the crude titanium tetrachloride obtained after c...

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1) The scheme of this patent is to add iron filings to the acidic solution of titanium chloride slag to reduce heavy metal ions. Although this method can also play a good effect, the added iron filings have brought new 2) This method evaporates and concentrates the final filtrate, which consumes a lot of energy. 3) The by-product hydrochloric acid produced by the tail gas washing in the production of titanium dioxide by the chlorination method has not been converted into valuable resources, resulting in a waste of resources

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