Process for removing copper slag and producing crude lead and lead copper matte by adopting melting treatment in bottom-blowing melting bath and device thereof

Abstract

The invention relates to a process for removing copper slag and producing crude lead and lead copper matte by adopting melting treatment in a bottom-blowing melting bath and a device thereof. The process is characterized in that a bottom-blowing melting furnace for melting is utilized to remove copper slag, produce products, such as crude lead, lead copper matte, and the like, produce reasonable waste slag and manufacture iron calcium silicate slag in the melting process so that the furnace slag reaching the waste slag requirement is used as a raw material of a building material plant, and the lead copper matte can be used for producing products of crude copper, and the like. The process has high heat utilization rate, low energy consumption, high production efficiency, long service life, low product cost, good melting environmental protection and easy automatic process control.

Description

Technical field: [0001] The invention belongs to the field of nonferrous metallurgy, and in particular relates to a process and a device for producing crude lead and lead matte by adopting bottom-blowing molten pool smelting to process copper removal slag. Background technique: [0002] In the process of lead smelting, whether the crude lead is refined by pyrolysis or electrolytic refining, it is necessary to remove copper by pyrolysis at the beginning of refining. The main components of the copper removal slag produced by pyrochemical copper removal are as follows (see Table 1), [0003] Table 1: Analysis list of main elements of copper removal slag [0004] [0005] This kind of copper removal slag is generally treated by fire method, the purpose is to separate the main component lead in the copper removal slag, and produce it in the form of crude lead, so that the copper in it is enriched in the form of lead matte, and the crude lead is used as the product It is sold...

AI Technical Summary

Problems solved by technology

Sub-furnace discontinuous treatment The temperature fluctuation in the furnace is large, the service life of the furnace refractory is short due to sudden cooling and sudden heating, the flue gas volume and flue gas composition fluctuate greatly, frequent replacement of feeding and discharging operations is labor-intensive, and the iron filings-soda ash method is used Copper removal slag is processed in the reverberatory furnace because the copper grade in the lead matte produced is too low and the impurity content is large, which is not conducive to matte blowing. It is necessary to configure the matte blast furnace to further remove impurities and enrich the matte. The matte blast furnace is The low-grade copper matte produced by the reverberatory furnace requires a series of operations such as ingot casting, cooling, crushing, and remelting. The labor intensity is high, the working environment is noisy, and the dust pollution is large. Cooling and remelting waste a lot of heat energy. Traditional Process reverberatory furnaces use pulverized coal or heavy oil as fuel for copper removal slag, and rely on pulverized coal, heavy oil and air to burn in the furnace to provide heat. The combustion-supporting air dilutes the SO2 concentration in the flue gas, which brings certain difficulties to flue gas treatment , the traditional process of removing copper slag adopts the soda ash-iron filing method to produce high-alkaline slag, which is highly corrosive to the masonry in the furnace, resulting in a short service life of the furnace lining. The main problems are that low-concentration SO2 flue gas is difficult to recover and pollutes the environment; labor intensity is high, the working environment is poor; thermal efficiency is low, energy consumption is high; furnace temperature changes greatly, slag is highly corrosive, and the life of the furnace lining is short.

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