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Molten copper slag dilution-side top composite blowing reduction integrated method

A molten copper and depletion technology, applied in the field of comprehensive utilization of copper slag, can solve the problems of inability to achieve slag-free and clean treatment, low energy utilization rate, and unusable sensible heat, etc., to achieve slag-free resource utilization , high-efficiency and low-energy heating smelting treatment, and the effect of reducing reduction energy consumption

Pending Publication Date: 2021-08-03
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these existing methods can realize the recovery and utilization of components such as iron in copper slag, they lack the treatment process for tailings and cannot achieve slag-free and clean treatment.
At the same time, the copper slag may be in a high temperature state when it comes out of the furnace, and its sensible heat cannot be utilized in these methods, and there is a problem of low energy utilization.

Method used

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  • Molten copper slag dilution-side top composite blowing reduction integrated method
  • Molten copper slag dilution-side top composite blowing reduction integrated method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) The molten copper slag is added to the depleted zone by the molten copper slag feeding port 1, and the oxygen-enriched fuel composed of pulverized coal and oxygen with an oxygen content greater than 30% is blown through the fuel spray gun 3 at the side of the depleted zone, and the The molten copper slag is heated to 1300°C to form a molten pool in the depleted area and maintain the temperature of the molten pool in the depleted area;

[0042](2) The depleting agent is added from the depleting agent feed port 2 to the molten pool in the depleted area for eddy current depletion, the mechanical stirring paddle 4 in the depleted area rotates at 100 rpm, and the depletion time is 30 minutes; depletion produces matte and copper content of 0.48% Depleted slag and matte are discharged and recovered from copper matte outlet 15;

[0043] (3) The lean slag overflows to the reduction zone, and the oxygen-enriched fuel is sprayed into the reduction molten pool through the top-b...

Embodiment 2

[0046] (1) The molten copper slag is added to the depleted zone by the molten copper slag feeding port 1, and the oxygen-enriched fuel composed of pulverized coal and oxygen with an oxygen content greater than 50% is blown sideways by the fuel spray gun 3 at the side of the depleted zone, and the The molten copper slag is heated to 1350°C to form a molten pool in the depleted area and maintain the temperature of the molten pool in the depleted area;

[0047] (2) The depleting agent is poured into the molten pool of the depleted area from the depleting agent feed port 2 to perform vortex depletion, the mechanical stirring paddle 4 in the depleted area rotates at 80 rpm, and the depletion time is 30 minutes. Depletion generates matte and copper-containing 0.39% depleted slag, and matte is discharged and recovered by copper matte outlet 15;

[0048] (3) The depleted slag overflows to the reduction zone, and the oxygen-enriched fuel is sprayed into the reduction molten pool throug...

Embodiment 3

[0051] (1) The molten copper slag is added to the depleted zone by the molten copper slag feeding port 1, and the oxygen-enriched fuel composed of coal gas and oxygen with 60% oxygen content is blown sideways by the fuel spray gun 3 at the side of the depleted zone, and the molten copper The slag is heated to 1250°C to form a molten pool in the depleted zone and maintain the temperature of the molten pool in the depleted zone;

[0052] (2) The depleting agent is poured into the molten pool in the depleted area from the depleting agent feeding port 2 to perform vortex depletion, the mechanical stirring blade 4 in the depleted area rotates at 20 rpm, and the depletion time is 40 minutes. Depletion generates matte and copper-containing 0.42% depleted slag, and matte is discharged and recovered by copper matte outlet 15;

[0053] (3) The depleted slag overflows to the reduction zone, and the oxygen-enriched fuel is sprayed into the reduction molten pool through the top blowing lan...

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Abstract

The invention relates to a molten copper slag dilution-side top composite blowing smelting reduction integrated method, and belongs to the field of comprehensive utilization of copper slag. The method comprises the specific steps that: (1) molten copper slag is added into a depletion smelting area through a feeding port, and oxygen-enriched fuel is injected to heat the copper slag; (2) a depleting agent is added into the molten copper slag through a depleting agent feeding port, vortex depleting is carried out under the vortex effect formed by mechanical stirring or gas injection stirring, and matte obtained by depleting is discharged through a copper matte outlet and returns to the main copper smelting process; (3) the depleted slag overflows to a reduction area, then a slag former and a reducing agent are added into a depleted slag molten pool, meanwhile, oxygen-enriched fuel is sprayed through a top spray gun, smelted and reduced CO is combusted, the temperature of the molten pool is increased to maintain heat balance, and vortex smelted and reduced are conducted under the action of mechanical stirring or gas injection stirring; and (4) copper-containing molten iron obtained by reduction is discharged from a molten iron outlet, and reducing slag is discharged from a slag outlet. The invention provides a new thought of a molten copper slag dilution-side top composite blowing reduction integrated method, efficient recovery of valuable components of copper and iron in the copper slag can be realized, high-valued slag-free 100% utilization is realized, and meanwhile, synergistic utilization of waste heat of the copper slag is realized.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of copper slag, in particular to an integrated method of molten copper slag depletion-side-top composite blowing and reduction, in particular to a method for resource utilization of hot copper slag and co-utilization of waste heat. Background technique [0002] The copper content in the smelting slag produced by oxygen-enriched blowing is relatively high, and it is necessary to deplete the copper slag and recover copper. At present, copper depletion and recovery are mainly through slow cooling beneficiation method and fire depletion smelting method. The beneficiation method can achieve good capture of copper and recover most of the matte inclusions, but it cannot realize the utilization of tailings. Pyrochemical depletion is to deplete the hot slag by electric heat, and put the copper-containing slag into the depletion furnace for sedimentation and separation and reduction of slag and mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B5/10C22B15/00C21B13/00
CPCC22B7/04C22B7/001C22B5/10C22B15/0052C21B13/0006C21B13/0066Y02P10/20
Inventor 张廷安豆志河吕国志郭军华刘燕张子木赫冀成
Owner NORTHEASTERN UNIV
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