Resourceful treatment method for manganese slag and calcium chloride waste residues

Abstract

The invention discloses a resourceful treatment method for manganese slag and calcium chloride waste residues, the resourceful treatment method is a method for realizing synergistic resourceful treatment through two-stage roasting of manganese slag and calcium chloride waste residues and utilizes the reaction characteristic that calcium chloride, silicon dioxide and water vapor in air form calcium silicate and hydrogen chloride at high temperature, manganese slag which is formed through reduction roasting and contains a low-valence manganese phase is mixed with the materials to be subjected to high-temperature chloridizing roasting, the roasted product is subjected to water leaching separation to obtain manganese chloride, water leaching slag composed of the mixture of calcium silicate, calcium sulfate and silicon dioxide is obtained, and collaborative resource utilization of the manganese slag and calcium chloride waste slag is achieved; the method improves the resource value of the solid waste, has higher economic benefits, also reduces the environmental pollution caused by independent treatment of the corresponding solid waste, and the whole treatment process is simple and feasible in steps, low in energy consumption and capable of being widely popularized and applied in the electrolytic manganese industry.

Description

technical field [0001] The invention belongs to resource utilization of smelting waste slag, and in particular relates to a resource treatment method of manganese slag in cooperation with calcium chloride waste slag. Background technique [0002] In the production process of electrolytic manganese dioxide, after manganese carbonate is leached by sulfuric acid, a large amount of electrolytic manganese dioxide slag (hereinafter referred to as "manganese slag") will be produced in the lime neutralization stage, and every ton of manganese dioxide produced will produce about 4 tons of manganese slag, except the main component calcium sulfate and a small amount of manganese oxide in the manganese slag. [0003] At present, the main bulk disposal method of manganese slag is landfill, especially in areas such as Guizhou Province, where the geographical conditions of hilly and mountainous areas are conducive to the construction of landfills with a level of one million tons or even te...

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Problems solved by technology

[0006] The Chinese patent application with the application number CN201910588744.2 discloses a method for producing manganese carbonate and iron powder by chlorination reduction roasting of ferromanganese ore. Anhydrous magnesium chloride, anhydrous calcium chloride, carbonaceous reducing agent and ferromanganese ore powder are evenly mixed The mixture is obtained, and all mixtures are reduced and roasted at one time, and the reduced product is obtained after cooling. This method is to separate and recover iron and manganese for high-iron manganese materials, and finally obtain manganese carbonate and iron powder, but the process waste is secondary waste. Realize bulk consumption of solid waste

And in the reaction process, the ionic anhydrous chlorine salt is directly used as the reactant of the chlorination reaction and the high-iron manganese raw material is subjected to a high-temperature and strong reduction reaction. Due to the stable structure of the chloride salt, the efficiency of the chlorination reaction is not high; and in the reduction and chlorination In the mixed high-temperature reaction system, the iron in the high-iron-manganese material will be rapidly chlorinated into ferric chloride prior to manganese. The boiling point of ferric chloride is only 316°C, and the ferric chloride with a low boiling point will quickly volatilize into the fume gas Dispersion, consumption of a large amount of chlorinating agent, resulting in a reduction in the recovery rate of manganese chlorination, so that a large amount of manganese still remains in the final secondary waste residue

[0007] Therefore, this kind of manganese recovery method for high iron manganese ore is not suitable for electrolytic manganese slag

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