Method for treating chromic slag by acid pickling process

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...