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Method and system for treating waste hydrochloric acid

A treatment method and technology for waste hydrochloric acid, applied in the directions of iron halide, iron oxide/iron hydroxide, etc., can solve the problems of high cost and large amount of fuel, and achieve the effect of low system cost

Inactive Publication Date: 2019-11-15
航天国环技术集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the spray roasting method, in order to heat the air to at least about 1000°C, a large amount of fuel is required, and the cost is high.

Method used

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  • Method and system for treating waste hydrochloric acid
  • Method and system for treating waste hydrochloric acid
  • Method and system for treating waste hydrochloric acid

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Embodiment approach

[0016] figure 1 It is a block diagram of the composition of the processing system of waste hydrochloric acid provided by the invention, as figure 1 As shown, the processing system 1 of the waste hydrochloric acid provided by the present invention comprises: a storage tank 2, a reaction tank 3, a filter press 4, a carbon nanofilter 5, an evaporation tank 6 and a hydrolysis tank, wherein the storage tank 2 is used to store waste Hydrochloric acid L1; reaction tank 3 is used to make waste hydrochloric acid L1 react with medicinal liquid to generate ferric chloride solution L2; described filter press 3 is used to separate the solution L2 provided by the reaction tank into solid matter C1 and filtrate L3; Carbon nanofilter 5 is used for filtering filtrate L3, generates solid matter C2 and ferric chloride solution L4; Evaporation tank 6 is used for evaporating the moisture content in ferric chloride solution, makes the trichlor in ferric chloride aqueous solution The iron oxide con...

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Abstract

The invention relates to a method and system for treating waste hydrochloric acid. The method comprises the following steps: carrying out a reaction on waste hydrochloric acid with waste iron to generate a solution containing ferric chloride; oxidizing the ferric chloride into ferric chloride, and concentrating the ferric chloride solution to prepare an aqueous solution with a ferric chloride masscontent of 80-86%; hydrolyzing the ferric trichloride in the aqueous solution at 190-205 DEG C to obtain beta-FeOOH. The prepared method and system for treating waste hydrochloric acid are low in cost.

Description

technical field [0001] The invention relates to a treatment method and system for waste hydrochloric acid, belonging to the technical field of waste treatment. Background technique [0002] Hydrochloric acid is used as a cleaning solution in the manufacturing process of industrial products such as steel materials and plated products. Used hydrochloric acid contains metal components (such as metal salts) derived from industrial products or their raw materials, and therefore has poor cleaning ability compared to hydrochloric acid before use. However, hydrochloric acid is not cheap, and disposal of hydrochloric acid waste liquid is expensive, so it is not desirable to discard used hydrochloric acid. Therefore, conventionally, these waste liquids have been regenerated and reused. [0003] For example, in the spray roasting method, a waste liquid containing hydrochloric acid is sprayed into the furnace. Hydrogen chloride (gas) and solids (metal oxides, etc.) are produced by co...

Claims

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Application Information

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IPC IPC(8): C01G49/02C01G49/10
CPCC01G49/10C01G49/02
Inventor 赵晓峰李开功
Owner 航天国环技术集团有限公司
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