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

Discontinuous processing of separate furnaces has large temperature fluctuations in the furnace, and the service life of the refractory materials for the furnace is short due to sudden cooling and sudden heating. The flue gas volume and flue gas composition fluctuate greatly, and the frequent replacement of feeding and discharging operations is labor-intensive. Copper removal slag is processed in reverberatory furnace because the copper grade in lead matte is too low and the impurity content is too high, which is not conducive to matte blowing. It is necessary to configure matte blast furnace to further remove impurities and enrich matte. When processing the low-grade copper matte produced by the furnace, a series of operations such as ingot casting, cooling, crushing, and remelting must be performed on the matte copper. 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. The traditional process The reverberatory furnace uses pulverized coal or heavy oil as fuel for the treatment of copper removal slag. The pulverized coal, heavy oil and air are burned in the furnace to provide heat. The combustion-supporting air dilutes the SO2 concentration in the flue gas, which brings certain difficulties to the 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 problem is the low concentration of SO 2 The flue gas is difficult to recover and pollutes the environment; the labor intensity is high and the working environment is poor; the thermal efficiency is low and the energy consumption is high; the furnace temperature changes greatly, the slag is highly corrosive, and the life of the furnace lining is short, etc.

Images