Method for treating high-iron and multi-metal zinc concentrate

Abstract

The invention discloses a method for treating high-iron and multi-metal zinc concentrate. The method comprises the following steps of: boiling and roasting zinc concentrate containing 14-20 percent of Fe, 0.03-0.10 percent of In, 0.2-0.6 percent of Cu, 0.2-0.6 percent of Cd, 0.005-0.02 percent of Ag. 0.1-0.2 percent of Sn and 40-50 percent of Zn to produce flue gas and a roasted product; preparing sulfuric acid by using the flue gas; blending the roasted product in a reducing agent to be reduced and smelted to produce a crude zinc alloy, crude silver-containing copper and furnace cinder; blowing the furnace cinder to obtain soot and blown furnace cinder, returning the soot to be reduced and smelted, and selling the blown furnace cinder; extracting copper and silver from crude silver-containing copper; enabling the crude zinc alloy to enter a conventional distillation tower for performing four stages of distillation to produce a pyrogenic process distilled zinc product, a crude cadmium product and a high-indium, tin and zinc alloy; extracting indium and tin from the high-indium, tin and zinc alloy. The method is reasonable in process, good in comprehensive recovery, high in production efficiency, low in product cost, and clean and environment-friendly in production process.

Description

technical field [0001] The invention relates to a nonferrous metal smelting method, in particular to a method containing Fe14-20%, In0.03-0.10%, Cu0.2-0.6%, Cd0.2-0.6%, Ag0.01-0.02%, Sn0. 1~0.2%, Zn40~50% high-iron polymetallic zinc concentrate treatment method. Background technique [0002] At present, the processing of high-speed iron containing Fe14~20%, In0.03~0.10%, Cu0.2~0.6%, Cd0.2~0.6%, Ag0.01~0.02%, Sn0.1~0.2%, Zn40~50% There are three main methods of extracting zinc and recovering multiple valuable metals from polymetallic zinc concentrates: [0003] The first treatment method is to use the conventional leaching wet process. The process adopts zinc concentrate fluidized furnace roasting and desulfurization--two-stage countercurrent leaching of zinc calcined sand with neutral and low acidity--extraction of copper and cadmium by replacing the middle and supernatant solution--purification of liquid electrowinning to produce zinc--low-acid leaching slag floating Sep...

AI Technical Summary

Problems solved by technology

The main disadvantages of this treatment method are: (1) The primary leaching rate of zinc is low, and the volatilization kiln has a large processing capacity, which requires a large amount of coal coke; (2) When the volatilization kiln processes floating silver tailings, the sulfur dioxide flue gas produced Only after treatment can it meet the national emission standards; (3) The recovery rate of various valuable metals is low, the recovery rate of indium is 75%, the recovery rate of copper is 80%, the recovery rate of cadmium is 75%, the recovery rate of silver is 40%, and the recovery rate of tin is 50%. , seriously affected the benefit

The main disadvantages of this method are: (1) a large amount of electric energy and reduced coal are consumed in the reduction smelting process of the electric furnace, and the production cost is high; (2) due to the strong reduction smelting of the electric furnace, the concentration of carbon monoxide is high during the process, and there are carbon monoxide poisoning and electric furnace bleed air Potential safety hazard of explosion; (3) There is no good method for the treatment of copper-containing pig iron, and copper and pig iron cannot be recovered at the same time; (4) The smelting recovery rate of indium, silver, and tin is low, and the recovery rate of indium is 75%, and the recovery rate of silver is 75%. The recovery rate is 50%, and the recovery rate of tin is 60%, which affects the economic benefits

The main disadvantages of this method are: (1) The amount of jarosite slag and high leaching slag is large, and a large amount of coke needs to be consumed in the reduction and volatilization treatment in the rotary kiln, and the production cost is high; (2) It contains a large amount of sulfate radicals, and a large amount of sulfur dioxide gas is decomposed during the reduction and volatilization process of the rotary kiln. The reduction and volatilization flue gas needs to be absorbed and treated before it can be discharged up to the standard

(3) The smelting recovery rate of indium, silver and tin is low, the recovery rate of indium is 80%, the recovery rate of silver is 30%, and the recovery rate of tin is 60%, which affects the economic benefits

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