SU634624A1 - Method of rotary-kiln processing of materials containing zinc and other nonferrous metals - Google Patents

Abstract

THE METHOD OF INTEGRATING OXIDIZED MATERIALS, CONTAINING ZINC AND OTHER COLORED METALS, in a rotary kiln, including the supply of coke to the mixture and oxygen-enriched air into the working space of the furnace, with the production of sublimates and the oxygen, enriched with oxygen, in the working space of the furnace, to produce sublimates and oxygen in the rotary kiln, to produce oxygen and oxygen in the rotary kiln. in blister copper and reducing fuel consumption, the clinker at the discharge end of the furnace is subjected to oxidation by supplying a stream of technical oxygen into the thickness of the charge at an angle of 45-55 ° to the furnace axis in the amount of 0.2-0.25 nm per 1 kg of clinker.

Description

05

from 4

O5

tc

four;

The invention relates to colored metal and can be used in the processing of copper zinc-containing oxidized materials in blast furnaces, for example, stubs, from the roasting of copper-zinc bulk concentrates, which are difficult to selectively float, lead slags, zinc cakes and other materials.

As a result, Velcevans usually receive sublimates containing zinc and lead in an oxidized form and clinker containing toxic, iron, noble metals, copper and other non-ferrous metals, if they were contained in the starting material.

The copper in the clinker is mostly in the form of a solid solution with iron. This, in turn, does not allow satisfactory separation of the copper concentrate from the clinker by known methods of mechanical enrichment. Due to the high carbon content, the processing of clinker is usually carried out with small additions to the charge of sintering and smelting.

A known method of welding of oxidized materials containing zinc and other non-ferrous metals in a rotary kiln, including the supply of coke into the mixture and air enriched with oxygen into the working space of the furnace parallel to its axis, c. getting sublimates and clinker.

The disadvantage of this method is the high carbon content in the clinker and the strong bond between copper and iron (solid solution), which makes it difficult to further process it. The purpose of the invention is to reduce fuel consumption and concentration of noble metals into blister copper.

This is achieved by burning carbon and oxidizing clinker iron at the discharge end of the kiln by supplying a directional jet of technical oxygen into the charge at an angle of 4555 to the axis of the Waelz kiln in the amount of 0.20-0.25 nm per 1 kg of clinker.

The method is carried out as follows.

A mixture consisting of raw materials and 30-35% of coke is charged into a preheated furnace (depending on the size of the industrial furnace and the content of zinc and lead in the mixture). For small ovens, the consumption of coke is significantly greater. As material progresses from the upper end of the furnace to the lower, zinc and lead are recovered and distilled off, which are carried away by the waste gases to the dust collection system. Non-volatile components of the charge (Cu, Au, AI, Fe, SiOj, etc.) and

excess carbon remains in the solid residue (clinker) and is drained by gravity from the lower end of the kiln. At the discharge end of the kiln, technical oxygen is fed into the mixture at an angle of 45-55 to its axis. Oxygen is supplied in an amount of 0.20 , 25 nm per 1 kg of clinker (at the rate of 0.93 nm - for oxidation of 1 kg of carbon and 0.2 nm - for oxidation

0 1 kg of iron).

The carbon burns completely, the heat of combustion is used to maintain high

5 temperature in the oven. Due to the high temperature, the decarburized clinker is melted, and the solid solution of copper in the iron contained in it is destroyed to form a rough

0 copper, in which precious metals are accumulated.

The melt from the furnace enters the electric settler. The separated black copper is brought to condition in the converter, and the ferrous slag is sent

5 in the domain process.

The method has been tested under half-reduced conditions.

Example r.Obbozhenny collective concentrate composition, wt.%: Zinc

0 16; copper 9.53; lead 2.1; iron 40; sulfur 2.15 in the amount of tOOO1100 kg per day is loaded into a rotary kiln 6 m long with a diameter of 0.5 m. Coke consumption 60% by weight

5 cinder (37.5% in charge). The consumption of technical oxygen is 25 nm per 100 kg of clinker (at the rate of 0.2 nm for the oxidation of 1 kg of iron and 0.93 nm for the oxidation of 1 kg of carbon in the blade).

The process is carried out at a temperature of 1200-1250 ° C. Vid code 18-25% of the charge. The degree of distillation of zinc and lead in sublimates 85-89%. In sublimates, co5 holds,%: zinc 65-68; lead 9-11. The yield of a non-volatile residue (clinker) is 80-90% of the charge, including that released during settling in the sand. 634624

trootdevice,%: black copper - 20%, save carbonaceous fuel

10-12, the iron residues (slag) 70 will be: (80:60) x20 26.7%. 80

Extraction of copper in the draft metal - The proposed method will provide

90-92%. Ability to recover more than 90%.

Recycled 26 tons of cinder. Copper copper in the form of concentrated productivity of pechidactus - blister copper and production

0.9 t / m per day. Maximum iron residue (clinker),

furnace productivity with the use of 0 carbon-free and color

oxygen-rich air metals will save carbon

0.75 t / m. Fuel in the range of 25-27% of the load at coke consumption of 60% and outflow due to the use of the heat of the sliplinker 80% with the carbon content of the carbon residue in the clinker.

Claims (1)

METHOD FOR WELCEPTING OXIDIZED MATERIALS CONTAINING ZINC AND OTHER NON-FERROUS METALS in a rotary kiln, including supplying coke to the charge and oxygen enriched air into the kiln working space to produce sublimates and clinker, characterized in that it is used for concentration of metals blister copper and reduce fuel consumption, clinker in the discharge end of the furnace is oxidized by supplying a stream of technical oxygen into the charge at an angle of 45-55 ° to the axis of the furnace in an amount of 0.2-0.25 nm ^L per 1 kg of clinker. SU .... 634624