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Method for comprehensively utilizing titanium chloride residues and filter liquid thereof in chlorination-process technologies for titanium dioxide powder

A technology of titanium dioxide and titanium chloride, applied in the direction of alkali metal chloride, alkali metal halide purification, cement production, etc., can solve the problems of resource waste, large energy consumption, high processing cost, save energy, reduce pollution, The effect of simplifying the process

Active Publication Date: 2016-10-26
YIBIN TIANYUAN GRP CO LTD +1
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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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  • Method for comprehensively utilizing titanium chloride residues and filter liquid thereof in chlorination-process technologies for titanium dioxide powder

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Embodiment

[0027] The following is the experimental data obtained by using the method of the present invention to process titanium chloride slag and filtrate water thereof in the laboratory.

[0028] 1. 50g of titanium chloride slag, the waste residue is dissolved in 250g of acidic solution composed of 20% waste hydrochloric acid produced by the washing process of the chlorine-containing waste gas treatment system and filter press flushing water at normal temperature and pressure, and a mechanical stirrer is used for dissolution Stir for 20 minutes, the pH of the dissolved solution is ≤ 1, and a suspension is obtained, and the suspension is filtered to obtain a primary filter residue and a primary filtrate. The chloride ion content of the primary filter residue is measured to be 3.23%, and the sodium chloride concentration of the filtrate is 53.23 g / L;

[0029] 2. Add the 20% waste alkali solution produced in the production process of the chlor-alkali production system to the primary filt...

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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...

Claims

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Application Information

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IPC IPC(8): C01D3/04C01D3/14C04B7/24
CPCC01D3/04C01D3/14C04B7/24Y02P40/10
Inventor 邓敏颜华毛焱明万立
Owner YIBIN TIANYUAN GRP CO LTD
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