Sulfide plumbum concentrate continuous oxidation-reduction smelting and slag fuming exhaust amine absorbing acid-production technique

Abstract

The invention discloses an acid process which includes a continuous reducing smelting and oxidization smelting for the lead sulfide concentrate and a slag smoldering and tail gas amine absorption. The invention comprises the following steps: smelting the lead sulfide concentrate in order to oxygenate continuously in the same metallurgical furnace; smelting in order to reduction; volatilizing and smoldering; preparing hydric sulphate after absorbing SO2. The invention is characterized by the following: absorbing the smoke gas with 0.008%-15% SO2 which is produced in every step with organic amine with the thermal instability; depositing SO2 continuously and steadily by heating organic amine with SO2 and preparing hydric sulphate continuously and steadily. The process produces the good quality hydric sulphate, which uses SO2 effectively.

Description

technical field [0001] The invention relates to non-ferrous metal metallurgical technology, in particular to pyrometallurgy of lead sulfide concentrate and flue gas acid production technology. 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 direct lead smelting me...

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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 concentration of SO2 in the flue gas is low, generally lower than 4%, which is difficult to treat and utilize economically, resulting in negative impact on the environment. Serious pollution is caused; 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 blast furnace smelting after the sintering block is cooled, and the energy consumption is high; the process is long and the equipment is large; the material turnover is large; the sintering block Return crushing, mixture sintering, and blast furnace smelting operations produce lead-containing dust, lead-containing steam and SO2 flue gas, causing serious low-altitude pollution, poor operating environment, poor labor and industrial hygiene conditions, and great harm to the health of employees

Moreover, low concentrations of SO 2 Because the concentration is too low to meet the current minimum concentration requirement of 4% for acid production, it is often not fully utilized, and the tail gas must be treated before it can be discharged.

[0006] All in all, the SO produced in the smelting of existing technology 2 Flue gas concentration fluctuations are very large, which is not conducive to continuous and stable acid production; and when SO 2 When the concentration is lower than 4%, it will no longer be used for acid production, and the treatment of tail gas will cost a lot of money, and resources will be wasted

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