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Method and equipment for reducing impoverishment of copper converting slag

A technology for copper blowing and depletion, applied in the field of copper blowing slag reduction and depletion, can solve the problems of thick frozen layer at the bottom of the furnace, low reduction rate, worsening furnace conditions, etc. The effect of good condition and low renovation cost

Active Publication Date: 2012-01-04
YUNNAN COPPER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of whether the reducing agent used in the electric furnace is solid, liquid or gaseous, the kinetic conditions of reduction are not good, so Fe 3 o 4 The reduction rate is low, the frozen layer at the bottom of the furnace is thicker, and the furnace condition is deteriorated; the batching method of water quenching and smelting is to quench the blowing slag into small particles and batch them together with copper concentrate and flux, and put them into the smelting furnace to recover copper. Purpose, this method requires less equipment and the process is simple. The main disadvantage is that the fuel rate of the smelting process increases greatly. Leading to high copper content in smelting slag waste slag and difficulty in subsequent treatment

Method used

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  • Method and equipment for reducing impoverishment of copper converting slag
  • Method and equipment for reducing impoverishment of copper converting slag
  • Method and equipment for reducing impoverishment of copper converting slag

Examples

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Embodiment 1

[0032] For a copper smelter with an annual output of 150,000 tons, a 60-ton P-S converter will be transformed. A fuel spray gun is installed on the end wall of one side of the converter. The combustion capacity of the spray gun is designed according to the fuel supply of 100kg-500kg / h; the refractory material of the converter mouth is increased by 100mm insulation layer; 1.6 meters, the position of the air outlet on the inner wall of the refractory brick is moved down, forming a 14° inclined downwardly inserted reducing agent injection channel. Put in 50 tons containing Cu 3.2%, Fe 3 o 4 46%, Fe / SiO 2 The molten blowing slag of 1.63 is sent to the reduction converter, and diesel oil is injected to keep the furnace temperature at about 1250°C. Coal-based reducing agent (fixed carbon 65%, volatile content 18%, sulfur 1.5%, particle size less than 5mm) enters from the tuyere. In the molten pool, the injection rate of the reducing agent is controlled at 15kg / min per gun, and th...

Embodiment 2

[0034] For a copper smelter with an annual output of 250,000 tons, a 100-ton P-S converter will be transformed. Install a coal-fired spray gun on the end walls on both sides of the converter, and the combustion capacity of the spray gun is designed according to the supply of coal (lower calorific value 28.5MJ / kg) 180kg-560kg / h per gun; the refractory material at the furnace mouth of the converter is increased 100mm insulation layer; there are two tuyeres on the converter, the center of the tuyeres is 1.9 meters away from the end wall, and the position of the air outlets on the inner wall of the refractory brick is moved down, forming a 17° angled downwardly inserted reducing agent injection channel. Put in 100 tons containing Cu 3.8%, Fe 3 o 4 44%, Fe / SiO 2 The molten blowing slag of 1.5 is injected into the reducing converter, and coal is injected to keep the furnace temperature at about 1250°C, and the coal-based reducing agent (fixed carbon 68%, volatile content 17%, sulf...

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Abstract

The invention relates to a method and equipment for reducing impoverishment of copper converting slag. The method is characterized in that a P-S converter is transformed into a reducing converter capable of injecting a fuel into a hearth for heat preservation and spraying a reducing agent into a melting bath; molten converting slag is introduced into the converter from the mouth of the reducing converter; a mixture of air and fuel is sprayed into the reducing converter from a combustion spray gun arranged on the end wall of the reducing converter so as to adjust the temperature and control the converter temperature to 1200-1300 DEG C; an S-containing coal-based reducing agent is sprayed into the converter from the tuyere of the reducing converter, the ratio of Fe / SiO2 in the slag is controlled at 1.3-1.8, and Cu2O in the slag is subjected to phase transition to form Cu2S; and when the reduction reaches the terminal, the molten slag is discharged from the mouth of the converter, slag with low copper content is subjected to slag and sulfonium separation, and the melt with high copper content is returned to the converter for converting. By utilizing the method and equipment provided by the invention, copper in the slag is subjected to phase transition to form copper matte by phase transition, and the melting point and viscosity of copper are improved, thereby facilitating the settlement and separation of copper matte from the slag and improving the direct recovery of copper in a converting process and the recovery of copper in a pyrometallurgical process.

Description

[0001] technical field [0002] The invention relates to a method and equipment for reducing and depleting copper blowing slag, belonging to the technical field of nonferrous metallurgy. Background technique [0003] The current pyro-smelting process of copper sulfide concentrate is: copper concentrate smelting to produce copper matte → copper matte blowing to produce blister copper → blister copper pyro-refining, electrolysis to produce refined copper (Cu﹥99.95%). The equipment used for blowing copper matte into blister copper includes P-S converter, flash furnace, top blowing furnace, continuous blowing reverberatory furnace, Mitsubishi continuous blowing furnace, etc. No matter which blowing method is used, it must be produced while producing blister copper. Output blowing slag. The blowing slag contains high copper (Cu﹥2%), and contains magnetic iron oxide (Fe 3 o 4 ) is usually 20% to 50%, and most of the copper is chemically dissolved in the slag in the form of oxid...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B13/00
CPCY02P10/20
Inventor 高峰沈强华王冲刘中华刘大方谢道庆陈雯朱维忠张邦琪王世明吕文帅代宏坤蒋鸿田释龙何云龙
Owner YUNNAN COPPER CO LTD