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Method for recycling vanadium-chromium-titanium waste salt in chlor-alkali

A vanadium-chromium-titanium and chlor-alkali technology, which is applied in the purification of alkali metal chlorides and alkali metal halides, can solve problems such as the difficulty of solid waste salt disposal, and achieve the effect of solving the difficulty of disposal

Active Publication Date: 2021-12-07
PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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Problems solved by technology

[0010] In view of the above-mentioned shortcomings, the present invention provides a method for reusing vanadium-chromium-titanium waste salt to chlor-alkali. It is used in the production of chlor-alkali chemical industry, realizes the resource utilization of waste salt in titanium enterprises, and solves the problem of difficult disposal of solid waste salt

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  • Method for recycling vanadium-chromium-titanium waste salt in chlor-alkali

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Embodiment Construction

[0041] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] In one embodiment of the present invention, as figure 1 As shown, there is provided a kind of vanadium-chromium-titanium waste salt recycling method for chlor-alkali, comprising the following steps:

[0043] (1) Pass solid waste salt and high-salt waste water into the vanadium-chromium-titanium waste salt refining system, remove vanadium-chromium-titanium, heavy metal ions and particulate impurities through two-step refined membrane filtration, and then catalyze decomposition to reduce the chlorate content to obtain qualified brine;

[0044] (2) After dissolving the industrial salt in the qualified brine and low-nitrate brine obtained in step (1), first remove calcium, magnesium, iron and other metal ions that can be precipitated by the two-alkali membrane filtration method (caustic soda and soda ash are used as refining agents) ,...

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Abstract

The invention discloses a method for recycling vanadium, chromium and titanium waste salt for chlor-alkali, which comprises the following steps: removing vanadium, chromium and titanium, heavy metal ions and particle impurities and reducing chlorate by using a vanadium, chromium and titanium waste salt refining system, and removing calcium, magnesium and iron, other metal ions, particle impurities, free chlorine, chlorate and sulfate by using a chlor-alkali brine refining system. According to the method, heavy metal ions such as vanadium, chromium and titanium and the like and chlorate ions which have great influence in the vanadium, chromium and titanium waste salt water and the solid waste salt are concentrated in the vanadium, chromium and titanium waste salt refining system to be synchronously removed and industrially reused for chlor-alkali chemical production, so that waste salt resource utilization is realized, and the problem that the solid waste salt is difficult to treat is solved.

Description

technical field [0001] The invention belongs to the technical field of waste water and waste salt treatment, and in particular relates to a method for recycling waste vanadium chromium titanium salt to chlor-alkali. Background technique [0002] It is an inevitable trend for enterprises to achieve sustainable development to promote the reduction of waste and secondary resources at the source and produce in a clean and environmentally friendly manner. In the process of titanium production (sponge titanium and chloride titanium dioxide), a large amount of high-salt wastewater mainly composed of sodium chloride will be produced. Such as molten salt chlorination, titanium white chloride, titanium tetrachloride refining and low-temperature chlorination tail gas treatment part, through water washing and alkali washing (sodium hydroxide), generate a large amount of waste hydrochloric acid, sodium hypochlorite and sodium chloride wastewater; The molten salt medium sodium chloride a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04C01D3/14
CPCC01D3/04C01D3/14C01P2006/80Y02P10/20
Inventor 蒲荣辉刘军张芋谢明辉尹文刚石玉英
Owner PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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