Dilution treatment method for copper smelting slag

Abstract

The invention provides a dilution treatment method for copper smelting slag. The dilution treatment method includes the technological steps that firstly, a mechanical stirring device is introduced into a dilution furnace, the high-temperature molten state copper smelting slag at the temperature ranging from 1150 DEG C to 1350 DEG C is guided into the dilution furnace, a stirring paddle is adjusted to stretch to the part from the 1 / 3 position of the liquid level of the copper smelting slag to the 1 / 2 position of the liquid level of the copper smelting slag, heating and stirring are started, the temperature of the copper smelting slag is controlled to range from 1200 DEG C to 1350 DEG C, the stirring speed ranges from 50 r / min to 200 r / min, and a vortex with the diameter height ratio ranging from 0.5 to 3 is formed; secondly, a vulcanizing agent is carried through carrier gas and injected to the position, close to the center of the vortex, of the surface of a copper smelting slag pool through a nozzle above the liquid level of the high-temperature molten state copper smelting slag, the adding amount of the vulcanizing agent is 0.3-8% of the mass of the copper smelting slag, and heat-preservation stirring is conducted for 10-60 min; and thirdly, standing layering is conducted, and copper matte on the lower layer and diluted slag on the upper layer are collected. The copper content of the diluted slag obtained after treatment is below 0.3%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for depleting copper smelting slag. Background technique [0002] Various copper smelting technologies have their own characteristics, and satisfy the modern copper smelting industry's energy efficiency, environmental protection, ability to deal with complex mines, and comprehensive recovery levels from different aspects and to varying degrees. With the continuous development of copper smelting technology, the smelting intensity and the taste of copper matte have been continuously improved, and the copper content of the primary smelting slag has also been continuously increased. Copper is sometimes as high as 3-4%, well above the current 0.3% copper mining grade. [0003] There are two types of methods for depleting copper smelting slag in industry: slow cooling mineral processing method and pyromelting method. After the copper smelting slag is discharge...

AI Technical Summary

Problems solved by technology

However, in the pyro-process depletion process, the vulcanizing agent is generally added directly at the top of the depleting furnace, and the vulcanizing agent floats on the surface of the slag, and the contact with the copper smelting slag is insufficient and volatilizes seriously, the utilization rate is low, and it is easy to cause environmental pollution

[0005] The patent application number is 200910088879.9 proposes an electrothermal depletion process for copper smelting slag, adding vulcanizing agent and copper smelting slag to the electrothermal depletion furnace, increasing the temperature of copper smelting slag by electrifying the electrodes, and spraying into the bottom of the depletion furnace at the same time Oxygen, and / or carbon monoxide gas and nitrogen gas mixture to improve copper recovery and resource utilization, but this patent does not consider the full mixing and reaction of vulcanizing agent and copper smelting slag, the utilization efficiency of vulcanizing agent is low, and due to the A large amount of sulfur dioxide gas is generated during the addition process, causing serious environmental pollution

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