SU1116733A1 - Method of treating tin-containing leaden industrial products - Google Patents

Abstract

METHOD OF 1STRINKING TIN-. CONTAINING LEAD PRODUCTS, including their reduction melting in electric furnaces, is also distinguished by the fact that, for the purpose of selective extraction of lead into the metal phase, and tin into slag and sublimates and cheapening of the process, tin-containing lead industrial products are melted together with the composition and the composition of the process. fuminate slag with a mixture flow rate of 6.3-7.2% by weight of middlings with a weight ratio in the clinker mixture to fusing slag 1:

Description

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Co 1 "The invention relates to the field of non-ferrous metallurgy, in particular, to methods for processing industrial products of lead production. A known method of processing tin containing lead middlings, including their reducing melting in an electric furnace with coke, silica, and sulfur-containing material. The disadvantage of this method is high coke consumption. The closest in technical terms is the method of processing tin-containing lead industrial products, including their reduction smelting in an electric furnace. Melting lead to ferrous slag with a deep slag bath. The disadvantages of this method are high coke consumption and insufficient selective separation of lead and tin. The aim of the invention is the selective extraction of lead into the metallic phase, and tin into the slag and sublimates, and the reduction of the cost of the process. This is achieved by the fact that in the proposed method of processing tin-containing lead middlings, including their smelting reduction in electric furnaces, tin-containing middlings are melted together with a mixture of clinker and fuming slag with a mixture consumption of 6.3–7.2% by weight of middlings with a weight ratio of Clinker mixes to fusing slag 1: (0.4-0.6). During the smelting process, carbon and metallic iron contained in clinker reduce the oxidized lead and tin compounds from industrial products: lead to metal, and tin to slag and sublimates. The ferrous oxide formed as a result of the reaction interacts with the cream with a clinker and fuminous slag cream and forms a foul slag. The smelting of tin-containing lead middlings mixed with clinker and fusing slag will make it possible to obtain low-melting falit slags. Metallic iron and carbon contained in the clinker serve as a reducing agent, thereby allowing lead to be extracted into the metal phase, and tin into slag and sublimates. 3I An example of the implementation of the proposed method. Melting was carried out in an electric furnace at a temperature of 1250 C for 120 minutes. Tin-containing lead middlings of the following composition were used in swimming trunks,%: lead 81.7, tin 2.2, copper 1.2, mouse 0.6, chlorine 0.3. Clinker,%: lead 0.2, zinc 1.2, copper 2.1, carbon 21.4, iron (met.) 11.2, silica 16.4, calcium oxide 4.8. Fusing slag,%: lead 0.2, zinc 2.8, copper 0.9, silica 26.1, calcium oxide 11.0, ferrous oxide 29.4. The results of the experiments are given in table. 1 and 2, from which it is clear that the best melting rates were obtained in experiments No. 2, 3.4, i.e. when feeding a mixture of clinker and fusing slag in the amount of 6.3-7.2% of the weight of tin-containing lead industrial products. At the same time, the weight ratio of clinker: fusing slag was 1: (0.4) -0.6. Increasing the consumption of a mixture of clinker and fuming slag to 7.6% or more by weight of middling (experiment 1) is not practical, since the extraction of tin into sublimates and slag decreases sharply and the slag yield increases. A decrease in the consumption of a mixture of clinker and fusing slag is less than 6, 3% of the weight of intermediate products (experiment 5) is also impractical, since the slag as a result of smelting becomes viscous and the reactions of reduction of lead and tin oxides proceed slowly and therefore the extraction of metals is low j 70%, tin 75%. The proposed method will simultaneously remove lead into the metal phase, and tin into slag and sublimates and reduce the cost of smelting tin-containing lead middling products, since expensive coke and sulfur-containing materials are excluded from the smelting charge. The proposed method makes it possible to additionally involve in the processing of clinker and fusing slag and increase the complexity of the use of raw materials. The resulting melting slag and sublimates may; be directed to the further extraction of tin from them using a known technology.

The results of smelting tin-containing middlings. . , - .. ,

Table 11167334 The expected economic effect from the processing of a conditional ton of industrial product will be 1,059.5 rubles.

A, 5

200

3.15

9.0 A, 5,200 9.0

2.7 200 A, 5 9.0

2.25 4.5 200 9.0

1.8

4.5 200 9.0

1.85 1 "098.11, A0.0 $ 0.7eOftfU.ft0.46.3 1" 5М.41.40.010.745.03.20.73.0 1709.71.00.010.835.03.00.57.0 1689 ".31.50,010.844.02.50 . "6.5 14498.01.10.044.930.0E.Ov, 95.6

1: 0.7

7,6

15.3 14.4 1: 0.6 7.2 6.7 13.5 1: 0.5 12.6 1: 0.6 5.8 11.7 1: 0.3 2.025.04.05.097. 570 3. “20.06.0b.O9 &, LM E.Bb. 19.05.07.098.9M E.518.06.05.098.493 2.020.04.04.070.075

Claims (1)

TIN PROCESSING METHOD. Hold LEAD middlings, comprising reducing melt them in an electric furnace, characterized in - u i and d c in that in order to selectively extract ^one tive lead into the metal phase and the slag and tin in the fumes and reduce the cost of the process, tin-containing lead is melted together with the middlings a mixture of clinker and fuming slag with a mixture flow rate of 6.3-7.2% of the weight of by-products with a weight ratio of ~ '. saffron in a clinker mixture to fuming slag 1: (0.4-0, 6). I £ a