Novel process for innocent treatment and resource regeneration of chromic slag

Abstract

The invention discloses a chromium slag harmless treatment and resource recycling new technology, which belongs to the chemical and metallurgical field, and includes the following main technological processes: the extracting technological process of a petroleum aided reagent, which follows that the chromium slag is ground and then pulpified by hot water, hexavalent chromium solution is obtained by pressure filtration, hydroxyl chromium oxide is generated by adding in sodium sulfide, chromium acetate and chromium lactate are generated by adding in acetic acid and lactic acid, and the petroleum aided reagent is obtained by adding in a flocculant; the extracting technological process of magnesium oxide, which follows that the chromium slag is pulpified by adding water, carbon dioxide is pressed in, and magnesium bicarbonate solution is obtained, then the magnesium bicarbonate solution is decomposed by heating to a temperature of 90 DEG C to prepare crystal magnesium carbonate, and the magnesium oxide is obtained under a high temperature of 900 DEG C; and the extracting technological process of a chromite sand, which follows that the chromium slag is washed by water so as to remove suspended particles, and a concentrate ore is obtained by removing particle impurities with smaller specific gravity through water floatation. Compared with the present chromium slag treatment technology, the technology of the invention has the advantages of simple process, low cost, high chromium extraction rate, and being capable of extracting a plurality of products, etc.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and chemical industry, and relates to the harmless treatment and recycling of chromium slag harmful substances. Background technique [0002] Chromium slag is chromium leaching slag, which is a solid waste discharged from the metallurgical and chemical industries during the production of metal chromium and chromium salts. Chromium slag is recognized as one of the most dangerous solid wastes, and it is the sixth priority pollutant among 117 kinds of extremely harmful substances recognized in the world. The existence, loss and diffusion of chromium slag have caused serious pollution and damage to the human body, animals and plants, and the environment. Chromium salt and metal chromium are an important material that is indispensable for the development of the national economy. In the past 30 years, a lot of research has been done on the treatment and comprehensive utilization of chromium slag in ...

AI Technical Summary

Problems solved by technology

However, in terms of harmless treatment and resource utilization of harmful chromium slag, it is difficult to implement due to factors such as incomplete detoxification, complicated process, small amount of slag eaten, excessive investment, high treatment cost or difficulty in selling recycled products; if A new process of harmless treatment of chromium slag and recycling of resources can be found to solve these problems by exploring a simple process and low investment, which can completely extract the hexavalent chromium in chromium slag, and at the same time obtain other valuable related products. problem