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Method for treating chromic slag by acid pickling process

A pickling method and chromium slag technology, which is applied in the chemical industry, can solve economic and technical problems that cannot be effectively treated, organic sludge is not easy to handle, and the import volume of chromium products has increased sharply, so as to eliminate hidden dangers of pollution and improve The effect of technology added value and low cost

Inactive Publication Date: 2005-07-06
刘克柱
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Problems solved by technology

The high-temperature sintering method is very costly and requires a lot of dressings, and the enthusiasm for popularization and use is relatively low; the deep burial method is slow in the treatment of bacteria, and it is accompanied by the generation of organic sludge, which is not easy to treat and forms new pollutants
Therefore, in dealing with chromium slag, due to economic and technical problems, various places cannot effectively implement the treatment, resulting in the existence of a large number of chromium slag in China.
According to statistics, there are millions of tons of chromium slag in chromate factories all over the country, which has caused huge hidden dangers to the environment.
In order to protect the environment, the state had to shut down almost all the enterprises that produced chromium slag, which led to a sharp increase in the import of chromium products and increased the cost of industrial products in our country

Method used

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Embodiment Construction

[0017] The best concrete technological process is described as follows below:

[0018] 1. Discharge the waste acid from the waste acid storage tank into the acid pool (the acid content of the acid solution is generally about 15%) through the pipeline, and then put chromium slag into the acid pool until the acid solution is submerged in the chromium slag ( Chromium slag can also be placed in advance, and then the waste acid is discharged). At this time, the chromium slag undergoes a chemical reaction after encountering the acid, and at the same time generates heat to accelerate the process of the chemical reaction. This chemical reaction can make part of Cr 6+ Chromium hydroxide sulfate (Cr 3+ ), other trace heavy metals contained in the chromium slag are also dissolved simultaneously.

[0019] 2. Introduce ultrasonic waves into the acid pool through the ultrasonic generator installed at the bottom of the acid pool or on the side of the acid pool, and the time is about 4 hou...

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Abstract

The invention relates to a method for treating chromic slag by acid pickling process. Wherein: mixing waste acid and chromic slag, leading supersonic wave into the acid tank by supersonic wave generator, discharging the acid liquor after treatment, deacidizing the hexavalent chromium ion in chromic slag to trivalent chromium ion completely by treating the acid liquor. The invention adopts resource method for treating chromic slag, and realizes innocuousness, resource-saving and economic benefit increasing.

Description

[0001] Field [0002] The invention belongs to the chemical industry field and relates to a method for treating chemical solid waste, in particular to a method for treating chromium slag by pickling. Background technique [0003] Chromium ferrite is an indispensable additive and dressing in the metallurgical industry and chemical industry. With the development of economy, the demand for chromium ferrite is very strong. my country's chromium ore resources are relatively short, and the grade is relatively low, and a large amount of imports are required every year. Chromium slag is the waste from the production of chromium ferrite, which contains a considerable amount of Cr 6+ , the Cr 6+ As a strong carcinogen, the pollution to the environment is relatively serious. According to the classification of solid wastes stipulated by the state, chromium slag is a dangerous waste and should be disposed of in time to avoid harm to people and the environment. Cr 6+ There are two ways...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C22B3/08C22B7/00
CPCY02P10/20
Inventor 刘克柱
Owner 刘克柱
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