Technological method for comprehensively recovering rhenium, sulfur and arsenic through self-heating volatilization of acid mud containing rhenium, sulfur and arsenic in vortex furnace

Abstract

The invention provides a technological method for comprehensively recovering rhenium, sulfur and arsenic through self-heating volatilization of rhenium, sulfur and arsenic-containing acid mud in a vortex furnace. The method comprises the following steps: drying a rhenium, sulfur and arsenic-containing acid mud raw material until a material discharged from a kiln is loose, adding a slag material, finely crushing, feeding into a vortex furnace, and carrying out volatilization and smelting, carrying out oxidation and exothermic reaction on the furnace material, wherein under the condition that the temperature is increased to 1400 DEG C or above and in an oxidizing combustion atmosphere, all rhenate in the furnace charge can be decomposed and volatilized, arsenic is oxidized into As2O3 steam, sulfur is oxidized into SO2 steam, and the As2O3 steam and the SO2 steam enter flue gas together; and carrying out rhenium and arsenic enrichment on the high-temperature flue gas in a flue gas washing tower, and feeding SO2 into a subsequent desulfurization tower for sulfur recovery. According to the method, the heat efficiency is high, more than 50% of energy is saved, high-value rare elements are saved, the direct recovery rate is about 10-30% higher, precious resources are effectively saved, the waste slag amount is reduced by about 75-90%, the waste slag is ferro-silicon calcium slag which is free of toxic substances and can be utilized, and the problem of secondary environmental pollution in a traditional method is thoroughly solved.

Description

technical field [0001] The invention relates to volatilization smelting technology, desulfurization technology and arsenic harmless comprehensive recovery and environmental protection technology, in particular to a process method for comprehensive recovery of rhenium, sulfur and arsenic by volatilization of rhenium-containing sulfur arsenate mud by self-heating of a vortex furnace. Background technique [0002] In the copper smelting industry, sulfur-arsenate mud is produced as a by-product during the acid production process of sulfur-containing flue gas. Because copper mines in different regions generally contain a very small amount of rhenium, these very small amounts of rhenium generally volatilize into the flue gas. In the process of making sulfuric acid, it is enriched in the acid mud, so that the rhenium content in the sulfur arsenate mud can reach several hundred grams to several kilograms per ton. Such rich rhenium-containing mud is an important secondary resource of ...

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Problems solved by technology

[0003] For the rhenium-containing sulfur-arsenate mud, the traditional comprehensive recovery process is to mix the rhenium-containing sulfur-arsenate mud with a large amount of lime and then put it into a high-temperature furnace, such as a rotary kiln, a multi-tang furnace, etc., so that the rhenium and calcium are easily soluble in water. The calcium rhenate is leached with water to separate it from the slag, and then the rhenium is extracted from the aqueous solution. The leached slag after separation has a large amount and contains high residual arsenic, which causes serious secondary pollution to the environment. This process is serious shortcoming of

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