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Direct blast furnace innocent treatment method of chromic slag pressure block

A technology for harmless treatment of chromium slag, applied to blast furnaces, details of blast furnaces, furnaces, etc., can solve the problems of long treatment period, high treatment cost, incomplete detoxification of chromium slag harmless treatment, etc., achieving obvious effects and avoiding Severe secondary pollution and obvious social benefits

Active Publication Date: 2014-08-06
赖红君
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 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

Method used

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Embodiment Construction

[0034] The method for harmless treatment of chromium slag briquettes directly into blast furnaces of the present invention is characterized in that it comprises the following steps:

[0035] 1. Ingredients, prepare qualified iron oxide scale, chromium slag and adhesive, the weight ratio of iron oxide scale is 45--70%, the weight ratio of chromium slag is 20--50%, and the weight ratio of adhesive is 5-- 7%;

[0036] The binder is an inorganic binder, such as calcium carbonate or potassium carbonate; or a mixture of the two, the mixing weight ratio is (5-8): (3-6); the role of the binder is after being pressed into a block , play the role of bonding, bonding the rolled steel oxide scale and chromium slag, etc., and increasing the bonding force between them;

[0037] 2. Prepare water with a weight of 10-14% of the total weight of the mixture. The water temperature can be normal temperature or heated hot water. Stir and mix evenly in the rolled steel oxide scale and chromium sla...

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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. Background technique [0002] 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 perforation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C21B5/00
Inventor 赖红君
Owner 赖红君
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