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Method and device for recycling useful substances from waste hydrochloric acid liquor

A technology for acid recovery and waste hydrochloric acid, applied in the directions of ferric sulfate, chlorine/hydrogen chloride, etc., can solve the problems of large investment and small income in recycling waste acid, achieve small investment in equipment, improve economic value, and solve the difficulty of recycling and processing waste acid. Effect

Inactive Publication Date: 2012-07-25
ENDIAN HUIZHI BEIJING INVESTMENT MANAGEMENT
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for recovering hydrochloric acid and producing ferrous sulfate and polyferric sulfate from iron-containing waste hydrochloric acid solution, which improves the concentration of regenerated acid and can be directly returned to the pickling section of the steel plant for use At the same time, high-quality ferrous sulfate and polyferric sulfate products can be obtained, which solves the problem of large investment and low income in recycling waste acid

Method used

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  • Method and device for recycling useful substances from waste hydrochloric acid liquor
  • Method and device for recycling useful substances from waste hydrochloric acid liquor

Examples

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Effect test

Embodiment 1

[0025] Put 11.7Kg of waste acid containing 11% iron and 5% hydrochloric acid into the hydrochloric acid regeneration reactor every hour, and put 2.3kg of 98% concentrated sulfuric acid into the hydrochloric acid regeneration reactor at the same time. After fully reacting, the acid vapor is brought into the absorption tower by the air flow. Reclaim 11.3Kg of 20% concentration hydrochloric acid; the ferrous sulfate and sulfuric acid raffinate mixture in the hydrochloric acid regeneration reactor obtains ferrous sulfate heptahydrate containing 19.8% iron after being filtered and dried by a separator, a cooling crystallization tank and a vacuum belt filter 6.39Kg.

Embodiment 2

[0027] Put 11.7Kg of waste acid containing 11% iron and 5% hydrochloric acid into the hydrochloric acid regeneration reactor every hour, and put 2.3kg of 98% concentrated sulfuric acid into the hydrochloric acid regeneration reactor at the same time. After fully reacting, the acid vapor is brought into the absorption tower by the air flow. Reclaim 11.3Kg of 20% concentration hydrochloric acid; Ferrous sulfate and sulfuric acid raffinate mixture in the hydrochloric acid regeneration reactor enter the ferrous sulfate storage tank after the separator, then ferrous sulfate 3.48Kg, concentrated sulfuric acid 0.34Kg, sodium chlorate 0.10 Kg, 0.04Kg of potassium permanganate, and 1.09 L of water are put into a polyferric sulfate reactor, and ozone is fully reacted under normal temperature and pressure for 30 minutes to obtain a polyferric sulfate containing 13.2% iron and a basicity of 14.4%.

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Abstract

The invention relates to a method and a device for recycling waste hydrochloric acid liquor and producing ferrous sulfate and polyferric sulfate. The method and the device are mainly characterized in that a certain proportion of concentrated sulfuric acid is added into a hydrochloric acid regeneration reactor internally containing the waste hydrochloric acid liquor, produced regenerative acid vapor is cooled to obtain regenerative hydrochloric acid, residual liquor in the hydrochloric acid regeneration reactor passes through a separator and is cooled, crystallized, filtered in vacuum and dried to obtain ferrous sulfate crystal, and the residual liquor can also pass through the separator and a ferrous sulfate storage tank and can be oxidized by ozone in a polyferric sulfate reactor to obtain the polyferric sulfate. The method and the device are simple and convenient in process, low in investment, high in recycling rate and applicable to recycling of a large amount of pickling waste liquor, and the economic value of recycling of the waste liquor is improved.

Description

1. Technical field [0001] The invention relates to a method and a device for recovering and regenerating waste hydrochloric acid liquid to produce ferrous sulfate and polyferric sulfate. 2. Background technology [0002] In recent years, the power industry has developed rapidly, and a large amount of galvanized steel structure materials need to be produced. Before galvanized steel materials are plated, impurities such as iron oxide and ferrous oxide on the surface must be cleaned with acid, so steel plants have produced a large amount of pickling Waste liquid, most of which is waste hydrochloric acid. A factory with an annual output of 60,000 tons of galvanized steel can produce nearly 20 tons of pickling waste liquid every day, which is equivalent to about 6,000 tons of waste hydrochloric acid that needs to be treated a year. If these waste acids can be effectively recycled and reused to produce chemical products with high economic value, it will not only reduce environmen...

Claims

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Application Information

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IPC IPC(8): C01B7/01C01G49/14
Inventor 季文姣夏颖黄亦妙
Owner ENDIAN HUIZHI BEIJING INVESTMENT MANAGEMENT
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