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...

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