Oxygen bottom-blowing smelting and liquid-state high-lead slag side-blowing direct reduction process

Abstract

The invention relates to an oxygen bottom-blowing smelting and liquid-state high-lead slag side-blowing direct reduction process, belonging to the technical field of metallurgy. The process mainly comprises the steps of: directly injecting liquid-state high-lead slag melt subjected to oxidization smelting by a bottom oxygen blowing smelting furnace into a reduction furnace, and directly reducing liquid-state high-lead slag into secondary lead bullion through side blowing in the reduction furnace by adopting crushed coal as fuel; and after high-sulfur smoke produced by the bottom oxygen blowing smelting furnace is subjected to waste heat recovery by a first waste heat boiler and dust collection by an electric dust collector, and delivering the high-sulfur smoke to a sulfuric acid workshop for acid making. According to the process disclosed by the invention, a blast furnace, a slag casting machine and corresponding auxiliary facilities are omitted, the advantages of little investment and high automation level are achieved, and the industrial production of low pollution and low-carbon and economy is realized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an oxygen bottom-blown smelting-liquid high-lead slag side-blown direct reduction process. Background technique [0002] my country is the world's largest lead producer and consumer. According to statistics, in 2009, the national crude lead output reached 3.14 million tons, and the consumption was 2.87 million tons. my country is also a country with poor lead ore resources. In 2009, the primary lead content was only 1.2 million tons. tons, which is far from meeting the production needs of lead smelting in my country, and most of the lead raw materials need to be imported. The current lead smelting processes in my country mainly include: sintering-blast furnace reduction process, oxygen bottom blown oxidation-blast furnace reduction process, which is an advanced lead smelting process jointly developed by China Nonferrous Engineering Design and Research Institute and ...

AI Technical Summary

Problems solved by technology

The outstanding drawbacks of the traditional "lead slag-blast furnace reduction process" are: ① high energy consumption; ② SO produced by sintering pot 2 The flue gas is completely emptied because it cannot be recovered, causing serious pollution to the atmosphere

③The separation and extraction technology of polymetallic complex metallurgical raw materials is backward, the recovery rate is low, and the pollution is heavy

For example, lead anode slime is currently mainly treated by fire, and the direct recovery rate of precious metals is only 70-80%. The recovery rates of other rare and precious metals bismuth, selenium, tellurium, and antimony are low. Disadvantages such as long time and large investment

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