Direct blast furnace innocent treatment method of chromic slag pressure block

Abstract

The invention discloses a direct blast furnace innocent treatment method of a chromic slag pressure block. The method comprises the steps of: adding water and evenly mixing chromic slag, an adhesive and rolling scale, or adding water and evenly mixing the chromic slag, the adhesive, the rolling scale and quick lime, adding water and evenly mixing the chromic slag, the adhesive and coal to prepare into blocks; baking or naturally drying and condensing, adding to a blast furnace with reducing atmosphere to smelt, and restoring hexavalent chromium into trivalent chromium and / or metal chromium. By adopting the treatment method disclosed by the invention, the chromic slag can be thoroughly detoxified and fully utilized; the treatment method has an obvious innocent treatment effect, and obvious social benefit, is free of any secondary pollution, and plays important roles in protection of soil texture, water quality and human health; the phenomenon that the chromium oxide value ascends due to the fact that the chromic slag is sintered at a high temperature firstly in the prior art is avoided; namely chromium is increased to sexavalence from trivalence; and the substance with larger toxicity is manufactured. Therefore, the direct blast furnace innocent treatment method has obvious social benefit and economic benefit.

Description

technical field [0001] The invention relates to a harmless treatment method for chromium slag, in particular to a harmless treatment method for putting chromium slag into a blast furnace with a reducing atmosphere for treatment, and directly putting chromium slag briquettes into the blast furnace for treatment. [0002] Background technique [0003] Chromium slag, the solid waste of the chromium salt industry, contains water-soluble and acid-soluble hexavalent chromium, and if it enters the environment, it will cause serious pollution and harm. Metal chromium is non-toxic, and Cr3+ is the most stable valence state of chromium, with little toxicity. The toxicity of Cr6+ is 100 times greater than that of Cr3+. It is irritating to the respiratory tract and digestive tract. Inhalation of dust or smoke containing Cr6+ compounds can cause acute respiratory tract irritation and allergic asthma. The damage to the respiratory tract can also be manifested as nasal septal ulcers and p...

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the deficiencies of the prior art such as incomplete detoxification of chromium slag harmless treatment, long treatment period and high treatment cost, and provides a chromium slag briquette that can be directly fed into the blast furnace without detoxification very thoroughly and greatly reduces the treatment cost. Hazardous treatment method