Chromium slag detoxification system and method

Abstract

The invention discloses a chromium slag detoxification system and method, which are simple in process, are ideal in chromium slag detoxification effect, are low in cost, are capable of treating waste with waste and producing an organic fertilizer with a high additional value. The method comprises the following steps: providing a manure fermenting tank; providing a chromium slag stacking tank; providing a septic tank; and providing a mixing tank, wherein the mixing tank is arranged below the manure fermenting tank, the chromium slag stacking tank and the septic tank; the manure fermenting tank, the chromium slag stacking tank and the septic tank communicate with the mixing tank through a communication pipeline; and through the communication pipeline, uniformly-mixed substances in the manure fermenting tank, the chromium slag stacking tank and the septic tank drop into the mixing tank; a mixture which drops into the mixing tank is uniformly mixed, so that chromium slag detoxification is realized.

Description

technical field [0001] The invention relates to a chromium slag detoxification system and method, in particular to a chromium slag biological detoxification system and method. Background technique [0002] In recent years, metal chromium and chromium salts have been widely used as industrial raw materials in electroplating, casting, chemical industry, metallurgy, leather manufacturing, aerospace and other industries, and their demand is also increasing day by day. The chromium slag produced in the industrial production process is harmful to the environment. Cause serious pollution. Chromium slag mainly refers to waste residue containing Cr(Ⅵ) produced in the production and application of chromium compounds. Roasting (or liquid-phase oxidation) reaction, and the residue containing Cr(Ⅵ) obtained after chromate leaching and separation is also included in industrial applications such as iron and steel, nonferrous metals, chemicals, electroplating, and leather tanning. Cr(Ⅵ)-co...

AI Technical Summary

Problems solved by technology

Among them, the dry detoxification method refers to the reduction of Cr(VI) to Cr(III) or Cr(0) by using reducing gases such as carbon monoxide produced by coal powder at high temperature to achieve the purpose of detoxification. In the dry detoxification method , a large amount of other raw materials are used, such as iron ore, china clay, clay, limestone, cement, etc., while chromium slag itself only accounts for a small amount of ingredients. That is to say, how to reuse resources after dry detoxification becomes New challenges, otherwise it is a waste of resources; wet detoxification mainly refers to chemical treatment methods, such as ferrous sulfate-lime method, sulfite reduction method, barium salt method, etc., and then developed ferrite method, ion exchange method, activated carbon method, electrolysis method, chelation method and other physical and chemical combination methods, etc., generally use alkaline solution or aqueous solution as carrier liquid, and use reducing agent to reduce Cr(VI) in chromium slag to Cr(III ) or precipitate as insoluble matter, so as to achieve the purpose of detoxification, but the wet detoxification method eats a small amount of slag, and the low-toxic residue after detoxification and a large amount of water-soluble salt need to be stored or processed separately, which is also a new challenge after detoxification. , the reduced Cr(III) can be easily oxidized to Cr(Ⅵ) and turn yellow after being stored in the open air for a long time, which affects the detoxification effect

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