Technics for expelling poison for chromic slag

Abstract

The invention relates to a chrome slag decontamination process. The process is characterized in that the barium chloride is dissolved and diluted into solution by water, barium carbonate is dissolved and diluted into suspension, which is put into a ball mill with the chrome slag for mixing grinding; when mixing grinding, the chrome slag is crushed; the hexavalent chromium in the chrome slag is continuously dissolved in the crushing process and is reacted with the barium ion to create the barium chromate not dissolved in the water. The invention has the advantages of short disposal process, simple process, good decontamination effect, large industrialization scale, high automation of production pipeline, trivalence chromium in the chrome slag after disposal not easy to be reverted into hexavalent chromium and the chrome slag after disposal mixed with the cement, lime and sand stone used for the stabilization soil of the earthwork.

Description

technical field

[0001] The invention relates to a chromium slag detoxification treatment process. Background technique

[0002] The waste residue discharged from the production of chromium salts contains water-soluble hexavalent chromium, which is recognized as a strong carcinogen, and hexavalent chromium is extremely permeable, causing serious pollution to the environment by penetrating soil, groundwater, and rivers. The existing treatment methods mostly use the reduction of hexavalent chromium to trivalent chromium, but under natural conditions, the reduced trivalent chromium will be oxidized to hexavalent chromium by the oxidation of oxygen in the air, which cannot be completely detoxified. Application number is 98113225.1, and the treatment method disclosed in the Chinese patent titled “Comprehensive Utilization of Chromium Slag Water Dissolved Poison” is: crush the chromium slag with water wet method and soak it in clear water for more than 24 hours, stir regularly, and...

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