Liquid-state high-lead slag side-blowing water-gas reduction process

Abstract

The invention relates to a liquid-state high-lead slag side-blowing water-gas reduction process, and belongs 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 blowing 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 combination of water gas and oxygen-enriched air. The reduction process is simple in technology, low in production cost and good in reduction controllability, and helps to realize low-pollution low-carbon-economy industrialized production.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a side blowing water gas reduction process of liquid high-lead slag. Background technique [0002] my country is the world's largest producer of lead. According to statistics, in 2012, the national output of crude lead reached 4.64 million tons. In December 2012, the monthly output reached 420,000 tons, a year-on-year increase of 1.85%. under great pressure. The main process of current crude lead smelting in my country is pyrometallurgy, and its biggest defect is environmental pollution. For a long time, both at home and abroad are devoting themselves to researching pollution-free lead smelting methods. But the effect is not obvious. For example, the traditional "sintering machine-blast furnace reduction process" has the following prominent disadvantages: ① high energy consumption; ② the SO2 flue gas produced by the sintering machine has a low recovery rate due t...

AI Technical Summary

Problems solved by technology

But the effect is not obvious

For example, the traditional "sintering machine-blast furnace reduction process" has the following outstanding disadvantages: ① high energy consumption; ② the SO2 flue gas produced by the sintering machine has low recovery rate due to low concentration, causing serious pollution to the environment

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

[0003] On August 15, 2012, the Chinese Invention Patent Application Publication No. CN102634674A disclosed an oxygen bottom-blown smelting-liquid high-lead slag side-blown direct reduction process proposed by the patent applicant of the present invention. The main process is to pass through the bottom-blown furnace The liquid high-lead slag melt from oxidation smelting flows directly into the reduction furnace, and the fuel is crushed coal. In the reduction furnace, the liquid high-lead slag is directly reduced to secondary crude lead by side blowing; the high-concentration sulfur dioxide produced by the oxygen bottom-blown smelting furnace After the waste heat is recovered by the first waste heat boiler and the dust is collected by the electric precipitator, the flue gas is sent to the sulfuric acid workshop to make acid; although the blast furnace, slag casting machine and corresponding auxiliary facilities are reduced in this process, the crushed coal with high calorific value is used for side blowing The reducing agent and fuel of the reduction furnace; because the temperature of the liquid high-lead slag itself is as high as 900-1000 ° C, the crushed coal is added to the side-blowing reduction furnace, resulting in a high viscosity of the liquid high-lead slag, and the lead content of the reduction slag is high; therefore, the high calorific value The utilization rate of crushed coal is low and the production cost is high

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