A kind of post-treatment method of pickling waste liquid containing zinc and iron ions
A technology of pickling waste liquid and iron ions, which is applied in chemical instruments and methods, zinc halides, iron oxides, etc., can solve the problems of surprisingly expensive and unsuitable corrosion-resistant materials
Active Publication Date: 2021-03-12
桐乡市思远环保科技有限公司
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The concentration of hydrochloric acid obtained by this method can reach 30%, but this method is not suitable for solutions containing other chloride salts except ferric chloride
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[0083] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0084] The FeOCl used in the present invention is an important mass transfer oxidation carrier, and the ferric chloride solution temperature can make Fe 2+ The chlorine-oxygen complex formed by ions through oxidation can increase the solubility of oxygen in ferric chloride solution and play the role of mass transfer oxygen, thereby accelerating and promoting the oxidation of ferrous ions.
[0085] The following description, of specific embodiments illustrating the principles of the invention, is for purposes of explanation and not limitation of the principles of the invention.
[0086] The present invention reclaims zinc chloride, ferric chloride and regenerated hydrochloric acid process flow diagram from pickling waste liquid as figure 1 , figure 2 , image 3 Shown: pickling waste from the hot-dip galvanizing industry, the typical chemical...
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The invention discloses a post-treatment method for pickling waste liquid containing zinc and iron ions. The current spray roasting method of pickling waste liquid can regenerate hydrochloric acid and produce iron oxide at more than 700 degrees, and the Pauli method can regenerate hydrochloric acid and produce iron oxide at 150 ° C and 7 atmospheres. The technical scheme adopted in the present invention includes: recovery of zinc chloride by ion exchange resin, recovery of red iron oxide by vacuum evaporation concentration and heating oxidation reaction, recovery of black iron oxide and regenerated hydrochloric acid by hydrothermal synthesis, and control of the oxidation kettle and hydrothermal synthesis kettle. Slight negative pressure. The invention realizes the recovery of high-purity zinc chloride, iron oxide and regenerated hydrochloric acid from the pickling waste liquid containing zinc and iron ions at medium temperature, with low energy consumption, low investment and low operating cost, and no secondary pollution and other beneficial effects.
Description
technical field [0001] The invention belongs to the field of pickling waste liquid treatment, in particular to a method for the post-treatment of pickling waste liquid containing zinc and iron ions, and recycling zinc chloride, iron oxide and regenerated hydrochloric acid in the process A method for post-treatment of pickling waste liquid. Background technique [0002] The pickling waste liquid (commonly referred to as pickling waste liquid, referred to as WPL) produced by the hot-dip galvanizing industry is mainly a solution containing ferrous chloride. Such solutions are usually disposed of by a method called high-temperature pyrolysis. At 700-900 ° C, the pickling waste liquid is sprayed into the hot combustion gas, and the ferrous iron is oxidized to ferric iron. Then decompose to obtain hydrochloric acid and iron oxide products, and the concentration of hydrochloric acid obtained by this method will not exceed 18%. Except for large steel plants, high energy consumption...
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IPC IPC(8): C01B7/03C01G9/04C01G49/06
CPCC01B7/035C01G9/04C01G49/06C01P2006/80
Inventor 蒋航宇朱富龙芦秀琴
Owner 桐乡市思远环保科技有限公司