A kind of technical method of self-heating volatilization of rhenium-containing sulfur-arsenic acid mud in a vortex furnace to comprehensively recover rhenium-sulfur-arsenic

Abstract

A technological method for comprehensively recovering rhenium-sulfur-arsenate mud containing rhenium-sulfur-arsenic acid by volatilizing rhenium-containing sulfur-arsenic acid mud by self-heating in a vortex furnace. In volatilization smelting, all the rhenate in the charge will decompose and volatilize, and the arsenic will be oxidized into As when the temperature of the exothermic oxidation reaction of the incoming charge rises above 1400°C and the oxidative combustion atmosphere 2 o 3 Steam, sulfur oxidation to SO 2 The steam enters the flue gas together; the high-temperature flue gas is enriched with rhenium and arsenic in the flue gas washing tower, and SO 2 Then enter the follow-up desulfurization tower to get rid of sulfur recovery. The method has high thermal efficiency, energy saving of more than 50%, and the direct recovery rate of high-value rare elements is about 10% to 30% higher, effectively saving precious resources, reducing the amount of waste residue by about 75% to 90%, and the waste residue is Ferrosilicon-calcium slag, which is non-toxic and available, completely solves the problem of secondary environmental pollution in traditional methods.

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 ...

AI Technical Summary

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

Images