A method of processing copper metal waste

 

(57) Abstract:

The invention relates to the field of non-ferrous metallurgy and can be used in the processing of secondary copper-bearing waste. A method of processing involves smelting wastes and their conversion in the vertical Converter with top blowing when fuel and oxygen through the fuel-oxygen burner, located at some distance from the surface of the charge or melt. Defined parameters of the fuel and oxygen, as well as the parameters of their submission for secondary refining of impurities, is provided to simplify the technology and hardware design process. 2 C.p. f-crystals.

The invention relates to the field of non-ferrous metallurgy, in particular to methods for processing of secondary copper-bearing materials.

A method of refining copper metal waste in a rotating Converter TBRC (U.S. Patent N 4581064). The method involves loading a solid metal waste in a rotary Converter with top blowing, the waste melting and refining of impurities by blowing oxygen-containing gas supplied through immersed in the melt of the tuyere. Working position of the Converter tilting of the 28o

The closest in technical essence is a method of processing copper metal waste technology Isasmelt (Annual Project Review. An MBM publication, 12/99, p. 32-35). The method involves melting of solid waste in a separate unit and converting the molten waste in the Isasmelt furnace by blowing the melt through a vertically-located fuel-oxygen burner, immersed in the melt. Secondary refining of blister copper is carried out in a separate furnace in two stages with the addition of soda and silica. The method allows to process waste to produce blister copper, but its disadvantage is the complexity of the process associated with the need for multiple units to melt the mixture, converting and secondary refining.

The aim of the invention is to simplify the process.

This objective is achieved in that in the method of processing copper metal waste, including smelting and refining by melt blowing oxygen-containing oxidant supplied together with a gaseous or liquid fuel through the vertically located the fuel-oxygen burner according to the invention the process of melting and refining of lead in pnem charge or melt the oxygen-fuel burner when the coefficient of excess oxygen , equal to 0.8-1.2.

In the particular case of refining copper melt from lead, zinc, tin and sulfur may be produced by sequential processing of the melt mixed gas produced by the combustion of fuel with oxygen.

The decrease in the Nickel content can be achieved by blowing of the melt with oxygen at the additional expense last 600-1000 nm3per hour, and the temperature of the melt 1150-1200oC for 10 - 30 minutes

Recycling of metal waste in a pre-heated vertical furnace with the fuel-oxygen burner located above the level of the charge, allows for smelting, converting and refining of the melt in one unit, which simplifies the process. Flow through the fuel-oxygen burner oxygen and liquid fuels (e.g. fuel oil) or natural gas at some distance from the melt or mixture provides not only the stirring of the melt and its interaction with gases (as in the prototype), but the interaction of the melt with the products of combustion of liquid or gaseous fuel with oxygen.

Selected experimentally costs of fuel and oxygen and the ratio of these costs allow for the of oxygen in the operation of the secondary refining due to the sequential processing of copper-containing melt gas mixtures produced during combustion of the fuel in oxygen at less than, equal to and more than 1, the possibility of regulation of the oxidation and transition into the slag separate impurities, which allows for the operation of the secondary refining in the same vertical Converter.

At higher flow of oxygen, when > 1,2, is the oxidation of copper and required too much fuel and oxygen for the operation of refining copper melt. At a lower flow rate of oxygen, when the < 0,8, there is an increased consumption of fuel for the smelting and reducing the performance of the unit. While reducing the flow of oxygen and fuel less than these values, you experience slow performance of the unit. While increasing the flow of oxygen and fuel more specified values decreases the resistance of the lining unit.

The decrease in Nickel content less than 0.4-0.5% is made by blowing molten copper with oxygen at the additional expense of 600-1000 nm3per hour through the fuel-oxygen burner for 10-30 minutes at a temperature of 1150-1200oC. Purge within less than 10 min is not possible to obtain a metal with a Nickel content of less than 0.5%. The blowing of the melt during the b formation of large amounts of momentum. Blowing copper melt at temperatures above 1200oC due to the increased solubility is not possible to obtain a melt with a Nickel content of less than 0.5-0.6%.

Examples of the method

The tests were carried out on an industrial scale 30-ton vertical Converter with the upper oil-oxygen burner. Processing was applied the following wastes: waste electrical production, dust smelters. Vertical Converter is pre-heated by oil-oxygen burner to a temperature of 1250oC, then it downloaded a batch of waste, and through the oil-oxygen burner, not reaching the surface charge of 0.3-0.5 m, was applied to the fuel and oxygen. In the fuel oil. Oxygen flow rate was maintained at 600-1300 nm3per hour, the consumption of fuel oil 400-600 kg/h. After converting and slag conducted secondary refining of copper melt, changing the ratio of fuel and oxygen: initially supported more than 1, by additional oxidation of the remaining impurities and output them into slag. Further, when = 1, producing heating of the melt, and then made the last stage of refining at < 1, the right held by the blowing of the melt with oxygen, moreover, the extra expense it was in the range of 600-1000 nm3per hour, the temperature was maintained at 1150-1200oC, purge time was 10-30 minutes. After secondary refining of copper melt was analyzed for copper, Nickel, lead, zinc, tin and sulfur.

Processing of copper metal waste in a vertical furnace top oxygen and fuel through the burner above the melt level, allows for the processing of copper-containing waste in a single unit with the final copper product of the desired composition, %: Cu 98-98,5; Ni 0,4-0,6; Pb - 0,08; Zn - 0,01; Sn - 0,09; S - 0,1; O2- less than 0.1%. This greatly simplifies the technology and instrumentation process.

1. A method of processing copper metal waste, including smelting, converting, by melt blowing oxygen-containing oxidant supplied together with a gaseous or liquid fuel through the vertically located the fuel-oxygen burner, and refining copper melt away impurities, characterized in that the processing of lead in a pre-heated vertical furnace with a supply of liquid fuel, such as MAZ is aspreva at a flow rate of liquid fuel 400 - 600 kg/h or natural gas 400 - 600 nm3/h and oxygen 600 - 1300 nm3/h ratio oxygen excess of 0.8 - 1.2.

2. The method according to p. 1, characterized in that the refining of the copper melt from lead, zinc, tin and sulfur produced by sequential processing of the melt mixed gas resulting from the combustion of fuel with oxygen when changing the ratio of the excess oxygen from 0.8 to 1.2.

3. The method according to any of the preceding paragraphs, characterized in that the refining of the copper melt from Nickel is produced by melt blowing oxygen through the fuel-oxygen lance for 10 to 30 min at the additional expense of oxygen 600 - 1000 nm3/h and a melt temperature of 1150 - 1200oC.

 

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