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System and method for treating titanium dioxide molten salt chlorination waste salt

A technology of molten salt chlorination and titanium dioxide, applied in the chemical industry, can solve problems such as environmental pollution, unfavorable resource utilization level, soil and water pollution, etc., and achieve the effects of simple and easy operation, efficient recovery, and easy operation.

Active Publication Date: 2018-08-28
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, every ton of TiCl produced by molten salt chlorination 4 About 200kg of waste salt will be produced, which is mainly soluble matter of sodium calcium magnesium iron, and direct stacking will cause serious pollution to the environment
The lime neutralization method adopted in China will still cause soil and water pollution, and it is not conducive to improving the utilization level of resources

Method used

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  • System and method for treating titanium dioxide molten salt chlorination waste salt
  • System and method for treating titanium dioxide molten salt chlorination waste salt
  • System and method for treating titanium dioxide molten salt chlorination waste salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] (1) Crushing: the titanium dioxide molten salt chlorination waste salt is crushed to obtain titanium dioxide molten salt chlorination waste salt particles with a particle size of less than 80 mesh.

[0158] (2) Acid dissolution-separation: water and titanium dioxide molten salt chlorination waste salt particles are mixed according to the liquid-solid volume mass ratio of 1:4, and the composition of the obtained titanium dioxide molten salt chlorination waste salt solution is shown in Table 2, and to Hydrochloric acid is added to adjust the pH of the solution to 2, the stirring speed is 20-600r / min, and the time is 30-120min to obtain 100L of the first filtrate and filter residue.

[0159] (3) Heavy iron-filtering: the first filtrate is heated to 80 degrees Celsius, and 1.2 times the theoretical amount of MnO is added thereto 2 , with a mass of 824.76g. The stirring speed is 200 revs / min, and the pH of the mixed solution is adjusted to 3.0 with a sodium hydroxide soluti...

Embodiment 2

[0168] (1) Crushing: the titanium dioxide molten salt chlorination waste salt is crushed to obtain titanium dioxide molten salt chlorination waste salt particles with a particle size of less than 80 mesh.

[0169] (2) Acid dissolution-separation: water and titanium dioxide molten salt chlorination waste salt particles are mixed according to the liquid-solid volume mass ratio 1:3, and the composition of the obtained titanium dioxide molten salt chlorination waste salt solution is shown in Table 3, and to Hydrochloric acid is added to adjust the pH of the solution to 2, the stirring speed is 20-600r / min, and the time is 30-120min to obtain 100L of the first filtrate and filter residue.

[0170] (3) Heavy iron-filtering: the first filtrate is heated to 90 degrees Celsius, and 1.2 times the theoretical amount of MnO is added thereto 2 , with a mass of 719.61g. The stirring speed is 200 revs / min, and the pH of the mixed solution is adjusted to 3.0 with a sodium hydroxide solution ...

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Abstract

The invention discloses a system and method for processing titanium dioxide fused salt chlorination waste salt. The system comprises a crushing device, an acid dissolving-separating device, an iron depositing-filtering device, a manganese depositing-filtering device, a magnesium depositing-filtering device, a calcium depositing-filtering device, a waste liquid recycling device and an electrolysis device. The crushing device is provided with a titanium dioxide fused salt chlorination waste salt inlet and a titanium dioxide fused salt chlorination waste salt particle outlet. The acid dissolving-separating device is provided with a titanium dioxide fused salt chlorination waste salt particle inlet and a first filter liquor outlet. The iron depositing-filtering device is provided with a first filter liquor inlet, a second filter liquor outlet and an iron containing filter slag outlet. The magnesium depositing-filtering device is provided with a second filter liquor inlet, a third filter liquor outlet and a magnesium containing filter slag outlet. The magnesium depositing-filtering device is provided with a third filter liquor inlet, a third filter liquor inlet, a fourth filter liquor outlet and a magnesium hydrate outlet. The calcium depositing-filtering device is provided with a fourth filter liquor inlet, a carbonate inlet, a fifth filter liquor outlet and a calcium carbonate outlet. The waste liquor recycling device is provided with a fifth filter liquor inlet, a hydrochloric acid inlet and a sodium chloride solution outlet. The electrolysis device is provided with a sodium chloride solution inlet, a sodium hydroxide solution outlet, a chlorine outlet and a hydrogen outlet.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular, the invention relates to a system and a method for treating titanium dioxide molten salt chlorination waste salt. Background technique [0002] The production of titanium dioxide and sponge titanium by chloride method is based on TiCl 4 For the raw material. At present, the chlorination of titanium-rich materials to prepare TiCl 4 The method can be divided into two kinds of fluidized bed chlorination method and molten salt chlorination method. Compared with the fluidized bed chlorination method, the molten salt chlorination method has strong adaptability to raw materials, especially for the chlorination process of high-calcium-magnesium (CaO+MgO≥5-9wt%) titanium-rich materials in the Panxi region of my country. . However, every ton of TiCl produced by molten salt chlorination 4 About 200kg of waste salt will be produced, which is mainly soluble matter of sodium calcium magn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B26/20C22B26/22C22B47/00C25B1/34
CPCC22B7/007C22B26/20C22B26/22C22B47/00C25B1/34Y02P10/20
Inventor 韩志彪吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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