SU738405A1 - Method of processing sulfide concentrates containing non-ferrous metals - Google Patents

Description

phase tension, which also aids in reducing the loss of colored metals with slag.

Upon receipt of poorer in meridor 5G: a joint and their subsequent conversion, the output of the converter slag increases, which entails an increase in the content of iron oxides in the waste slag of the electric furnace. To: reduce the content of these oxides in the slag, a part of them can be reduced to metal with the help of coke, Obra; The remaining metallic iron will dissolve in the matte, metallize it.

; In a metallized copper matte, reactions can also take place, also contributing to the stripping of zinc and lead.

The chemical slag thus obtained is chemically suitable for construction and technological purposes.

When converting mattes, part of the electric furnace slag in liquid form is used as a fluxing material. The use of slag electrofusion during conversion dramatically reduces or completely eliminates the consumption of fluxes, facilitates the formation of converter slag, reduces the content of non-ferrous metals in it and reduces their circulation between the electric furnace and the converter, makes the converter more hot, while increasing the possibility of processing additional amounts of cold copper-containing additives, i.e. increasing the productivity of the converter, and creates the possibility of processing copper-rich mattes without additional flooding of the converter.

By reducing the amount of converter slag and improving its composition (an increase in calcium oxide concentration and a decrease in magnetite content) lead stripping from matte to sublimates increases, as well as the composition of electrical furnace slag while simultaneously reducing its output, the latter means a decrease in absolute losses of Cs metals with slag. The return to the electric furnace of a smaller amount of converter slag with a high content of calcium oxide eliminates the possibility of the formation of magnetite buildup at the place of discharge of this slag into the electric furnace, thus facilitating the operation of the smelting unit, and generally creates conditions for increasing its productivity.

Thus, smelting with lime feed is from 2.0 to 6.0 tons per 1 ton of iron in the solid charge, as well as using as a flux for

converting the waste slag of an electric furnace when calcium oxide corresponds to iron oxide (1-5): 1 and silica to iron oxide (4-9): 1 allows to increase copper recovery in matte to 99.3%, and lead in matte and sublimates - up to 98.4% - to reduce or completely eliminate quartz ore, which is used as a flux when converting matte, to obtain waste slag suitable for construction and technological purposes, including as a flux when converting matte, increase the performance of electric furnaces and converters, reduce the output of waste slag.

Experiments show that, at a lime consumption of 2.5 t / 1 t of iron in the solid charge, a waste was obtained with a copper content of 0.28% and lead 0.30% / copper extraction in matte 99, 1%, and lead in matte and sublimates 95, 4%.

With an increase in lime consumption to 4.0 and further to 5.5 tons per 1 ton of iron in the solid charge, the content of copper and lead in waste slag decreases to 0.13 and 0.18%, respectively, and the extraction of copper in matte and lead in matte and sublimates increase to 99.3 and 98.4%, respectively.

When smelting the copper mixture; with the consumption of lime 1.36 tons per 1 ton of iron in the solid mixture, slag was obtained with a high cQ / holding copper and pig in it.a — 0.54 and 0.4%, respectively, and by its chemical composition unsuitable for the production of building materials.

In all the experiments, the copper content in the matte is 59-60.3%, and the ratio of calcium oxide to iron oxide and silica to iron oxide in the waste piece varies in the limits (1-5); 1 and (4-9) : 1 respectively.

When smelting the copper mixture with the consumption of lime more than bt per 1 ton of iron in the solid mixture, the normal separation of the smelting products did not take place:

From the data obtained, it follows that at lime consumption from 2.0 to 6 tons per ton, cheles in the solid mixture obtained the highest rates for the extraction of copper and other non-ferrous metals.

Claims (2)

Example. 100 g of matte are filled with Eia at the bottom of the alundum crucible, then 17 g of synthetic shlka composition,% 25.2 -CaO; 52.7 14.0 FeO, - 7.1 Ae2.0z. The crucible is tightly closed with a graphite lid and heated to 1250С. After the matte and slag melt, the lid is removed and the matte is blown through the alu tube for 1 h, the air volume is 42 l. As a result, a white matte composition is obtained,%: 77.6 si; 0.5 Pb; 0.6 Fe; 18.2 S, and converter slag composition,%: 3.6 C; 2.2 Pb; 35.8 Fe; 24.2 13.4 sao P r im e r 2. Convert 100 g of matte (composition according to example 1); 15 g of encased slag are used as a flux,%: 0.1 Cu; 22.0 sao; 55.4 8.2 FeO; 10.3. The conditions of the experiment are the same as in example 1. As a result, a white matt composition,% i 78.0 Cu; 0.7 Pb; 0.5 Fe; 18.6 S, and converter slag composition,% t 4,1 Cu 2,6 Pb; 34.2 Fe; 29.0 SiO; 15.4 CaO Comparing the results of experiments on converting matte, it should be noted that the dumped high silicon slag of copper smelting has a good Flux capacity, which is confirmed by the compositions of the obtained white matt and converter donkey. In addition, the use of this flux reduces the lead content in the converter slag by about 2 times. Electric furnace slag, obtained during the industrial tests, has a higher iron content, therefore, its consumption as a flux when converting is increased. The invention of the method for processing sulphide concentrates containing non-ferrous metals, including the electric concentrator concentrates and converting mattes with the supply of flukes, characterized in that, in order to increase the extraction of non-ferrous metals, reduce the consumption of fluxes and produce a waste mold suitable for the production of building materials, smelting with a load of 2-6 tons of limestone per 1 ton of iron and a solid charge, and as a flux when converting, use the slag dowel slag of electric smelting with the ratio of the oxide of feces in it Cuts to ferrous oxide (1-5): 1 and silica to ferrous oxide (4-9) "1. Sources of information taken into account during the examination 1. Kershansky I.I. et al. Introduction of smelting of granulated copper-containing charge in ore-smelting furnaces. Non-ferrous metals 1976, 3, p. 8-11.