Method and equipment for continuous smelting of lead sulphide concentrate

Abstract

A lead sulfide ore concentrate continuous smelting method and equipment thereof are provided. The invention relates to a pyrometallurgical process of lead sulfide ore concentrate and the equipment adopted for realizing the process. In the device, a partition wall is arranged in the space above the liquid slag layer of the molten pool of the furnace body, which separates the device into three regions of an oxidation region, a reduction region and a fuming region that are not communicated. The top of every region is equipped with a flue gas outlet and is respectively equipped with a spray gun. A material smelting inlet is arranged on the top part of the oxidation region. A siphon discharging outlet is arranged on a crude lead layer on the bottom of the furnace body. A slag discharging outlet is arranged on the liquid slag layer of the fuming region. The smelting materials are continuously fed in the furnace from the top of the oxidation region. The liquid metal lead is continuously discharged out of the furnace from the siphon discharging outlet. SO2 obtained in the oxidation area is used for preparing sulfate acid. Valuable metal smoke dust such as high zinc that is obtained in the fuming region is reused. The invention has the advantages of short process line, fully utilization of slag heat, obvious energy saving effect, less investment in the metallurgical furnace equipment, low activity-based cost, small concentration fluctuation of SO2, cheap reducing agent and wide resources.

Description

technical field [0001] The invention relates to non-ferrous metal metallurgical technology, in particular to the pyrometallurgy of lead sulfide concentrate and the special equipment used to realize the process. Background technique [0002] Lead smelting methods can be summarized into two categories: traditional lead smelting method and direct lead smelting method. The traditional lead smelting method is the sintering machine-blast furnace smelting method; the direct lead smelting method is to cancel the sintering process of the lead sulfide concentrate, and the raw concentrate is directly smelted in the furnace. For many years, the traditional method has been the main production method of lead. However, with the continuous improvement of human awareness and requirements for environmental protection and energy conservation, the shortcomings of the traditional lead smelting method have become increasingly prominent. Many lead smelters in the world have gradually adopted direc...

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Problems solved by technology

[0004] The traditional lead smelting method has disadvantages that are difficult for people to continue to accept: the amount of flue gas produced by sintering machines and blast furnaces is large, and the flue gas SO 2 The concentration is low, it is difficult to treat economically, and it will cause serious pollution to the environment; a large amount of oxidation reaction heat is not fully utilized in the sintering process, and a large amount of expensive metallurgical coke is consumed in the blast furnace after the sintering block is cooled, and the energy consumption is high. ;Long technological process, many equipments; many material turnover; sintered block return crushing, mixture sintering, blast furnace smelting, these operations will produce lead-containing dust, lead-containing steam and SO 2 The flue gas caused serious low-altitude pollution, poor operating environment, poor labor and industrial sanitation conditions, and great harm to the health of employees

Moreover, low concentrations of SO 2 It is often not fully utilized, and it must spend more money on treatment before the tail gas can be discharged.

[0007] The Gifset method basically realizes the completion of three smelting processes of lead sulfide concentrate in the same furnace, but the material preparation of this method is complicated and needs to be ground and dried; the reduction requires expensive metallurgical coke; and a high-power electric furnace is required as a Reduction and fuming heat supply, high energy consumption; complex equipment, high investment

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