Method for regeneration of waste hydrochloric acid by oxygen enriched roasting

A technology of oxygen-enriched roasting and waste hydrochloric acid, applied in chlorine/hydrogen chloride purification, chlorine/hydrogen chloride and other directions, can solve the problems of increasing roaster gas volume, increasing load, restricting processing capacity, etc., achieving high waste acid processing capacity, improving The effect of processing capacity and convenient expansion

Inactive Publication Date: 2010-02-24
CHENGDU HUAXI CHEM TECH CO LTD
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Problems solved by technology

First of all, due to the low oxygen content in the air, it is impossible to provide enough oxygen to satisfy the combustion of a large amount of gas and the high-temperature thermal decomposition of a large amount of chloride, which largely restricts the performance of the roaster and the entire waste acid regeneration unit. Second, the existence of a large amount of useless nitrogen in the air greatly increases the volume of the roaster gas, thereby unnecessaryly increasing the load of subsequent absorption, washing and other steps

Method used

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  • Method for regeneration of waste hydrochloric acid by oxygen enriched roasting
  • Method for regeneration of waste hydrochloric acid by oxygen enriched roasting

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Embodiment 1

[0012] The waste hydrochloric acid solution formed after pickling of steel plates or leaching of non-ferrous metals enters the roasting furnace after pretreatment such as filtration and concentration. At the same time, the air separation device produces oxygen-enriched oxygen with an oxygen content of 22% to 95%. Using this oxygen-enriched gas as a combustion-supporting gas, the waste acid liquid is roasted in the roaster with oxygen-enriched, and the solid by-products obtained from the roasting are collected and packaged. Shipping sales. The furnace gas formed after roasting is rich in HCl, and after being absorbed by the washing liquid from the washing process, regenerated hydrochloric acid is generated and reused. After the absorption process, the furnace gas is washed with water to remove residual acidic substances. The cleaned furnace gas is discharged through the chimney after washing.

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Abstract

The invention provides a method for the regeneration of waste hydrochloric acid by oxygen enriched roasting. The method is characterized in that: air separation technology is adopted to separate air to extract enriched oxygen of which the purity is 22 to 95 percent, and the enriched oxygen is used to replace air to serve as the roasting combustion-supporting gas in the roasting treatment for the oxygen enriched roasting of the waste hydrochloric acid. The method has the advantages of greatly improving treating ability of a waste acid regenerating device, lowering energy consumption of the system, and lowering production cost of regenerating the waste hydrochloric acid.

Description

technical field [0001] The invention relates to a method for regenerating waste hydrochloric acid through oxygen-enriched roasting, which belongs to the field of environmental protection and clean production. Background technique [0002] In the process of pickling steel plates and non-ferrous metals in the iron and steel industry, a large number of sulfuric acid was used to pickle steel plates or leach non-ferrous metals in the past, resulting in a large amount of unrecoverable sulfides, which constantly caused serious environmental pollution problems. At present, the vast majority of enterprises use hydrochloric acid to pickle steel plates or leach non-ferrous metals, and pass through the high-temperature thermal decomposition of the waste acid solution together with the large amount of chloride generated during the roasting process, and then recover chloride ions to produce regenerated acid. [0003] Usually, the above-mentioned waste hydrochloric acid roasting regenerati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07
Inventor 李东林宋兵郎治汪然
Owner CHENGDU HUAXI CHEM TECH CO LTD
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