RU2368676C1 - Charge for reducing fusion of copper-chloric cake - Google Patents

Abstract

FIELD: metallurgy. ^ SUBSTANCE: charge for reducing fusion contains copper-chloric cake, soda ash, solid carbonaceous restorative and limestone, in following correlations of ingredients, wt %: soda ash 4.0-4.5, limestone 8.5-9.0, solid carbonaceous restorative 8.0-8.5, copper-chloric cake - the rest. ^ EFFECT: increasing of copper extraction into metal phase and improvement of its qualities by admixtures. ^ 1 tbl. 1 ex.

Description

The invention relates to ferrous metallurgy and can be used in the production of blister copper.

Known compositions of the charges for the reduction smelting of oxidized copper-containing materials, including smelting in a shaft furnace of agglomerated secondary copper in the presence of coke with the addition of quartz and limestone (Fundamentals of Metallurgy, vol. 2.- M .: Publishing House of GNTIl for ferrous and non-ferrous metallurgy. - 237 -239).

The disadvantage of this method is the high consumption of scarce coke fuel and it is necessary to conduct preliminary agglomeration of materials for smelting in a shaft furnace.

The closest in technical essence and the achieved result is a mixture for reducing smelting of copper-chlorine cake, comprising from 6 to 10% by weight of copper-chlorine cake of soda ash and from 0 to 10% of solid carbon reducing agent - charcoal. In terms of the known composition of the mixture is the following, wt.%:

Soda ash 5.1-9.1 Solid Carbon Reducer 0-10 Copper Chloric Cake rest

(see I. Enchev. The possibilities of recirculation and diversification for the development of zinc production. - Scientific reports of the fourth international conference. Zinc 2006. - Plovdiv. Bulgaria, September 11-12, 2006 - P.103-109).

The disadvantage of this charge for the reduction smelting of copper-chlorine cake is the low recovery of copper in the metal phase up to 71%.

The technical result of this invention is to increase the extraction of copper in the metal phase during the melting of copper-chlorine cake. The specified result is achieved by the fact that in the charge for reducing smelting of copper-chlorine cake containing copper-chlorine cake, soda ash and solid carbon reducing agent, limestone is additionally contained in the following ratios of ingredients, wt.%:

Soda ash 4.0-4.5 Limestone 8.5-9.0 Solid Carbon Reducer 8.0-8.5 Copper Chloric Cake rest

Recovery smelting of the specified composition of the charge is as follows. Obtained during copper-chlorine purification of zinc solutions, copper-chlorine cake composition,%: copper 40-65; zinc 1-2; lead 2.0-2.5; iron 0.2-0.4; chlorine 6-10 with a moisture content of 18-22% is mixed in a two-blade mixer with limestone, soda ash and coke breeze and sent to an electric furnace. The working temperature of the heat is 1125-1150 ° C. Duration of smelting is 1.5-2 hours. During the smelting process, a metal phase, slag and sublimates are obtained. The bulk of zinc up to 85-90% goes into slag. Chlorine 90-95% goes into sublimates, which are captured in scrubbers irrigated with water. The pulp emerging from the scrubbers is filtered. After precipitation of heavy metals with soda ash, the solution is sent to treatment plants, and the precipitate filtered and washed from chlorine is processed in the main production cycle.

Copper is reduced and 90-93% goes into the metal phase - blister copper containing 96-98% copper; 1-2% lead and zinc 0.1-0.4%. Blister copper is a commercial product and is sent to copper plants. Slag containing,%: copper 15-20; zinc 4-6; lead 1.5-2.5; iron 2-3; chlorine 2.0-2.5, processed by Waelz.

Tests of the charge showed that the addition of limestone in the range from 8.5 to 9% allows to increase the extraction of copper in the crude metal. When the dosage of limestone is less than 8.5% and the increase in soda ash in the charge is more than 4.5%, the extraction of copper in the metal phase decreases, and when the dosage of limestone is above 9%, the copper content in the crude metal decreases due to an increase in the conversion of lead and other impurities into it. Only with this ratio of ingredients can we obtain the maximum extraction of copper in the crude metal and its best quality.

An example of the use of the charge.

As components of the mixture used copper-chlorine cake (Cu-Cl cake) composition, wt.%: Copper - 60.7; zinc - 1.35; lead - 2.2; iron 0.28; chlorine 8.1; soda ash GOST 5100; limestone TU 0750-002-00186996; coke breeze TU 17-7-115. The components of the mixture were mixed and loaded into a crucible furnace. The melting process proceeded at a temperature of 1130 ° C for 1.5 hours. At the end of the melting, the metal and slag phases were separated. The table shows the options for the compositions of the proposed mixture and for comparison, the composition of the prototype.

Technological indicators of reducing smelting of a charge of different composition Test charge The content of components,% Extraction of Cu in blister copper,% Cu content in blister copper,% Cu-Cl cake Soda ash Limestone Solid Carbon Reducer Proposed rest 4.2 8.8 8.5 92.5 97.2 According to the prototype rest 7.9 0 8.5 63.7 96.8

As can be seen from the table, when using the proposed charge increases the extraction of copper in the metal phase (blister copper) compared with the prototype from 63.7 to 92.5%. During the reduction smelting of the proposed charge, the metal quality is higher in copper content (97.2 versus 96.8%).

Claims (1)

The mixture for the reduction smelting of copper-chlorine cake containing copper-chlorine cake, soda ash and solid carbon reducing agent, characterized in that it additionally contains limestone in the following ratio of ingredients, wt.%:
soda ash 4.0-4.5 limestone 8.5-9.0 solid carbon reducing agent 8.0-8.5 copper chlorine cake rest