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Method for eliminating magnetic iron oxide furnace accretion produced in copper sulfide concentrate pyrometallurgical process

A technology for pyrometallurgy and iron oxide furnace, which is applied in the direction of improving process efficiency, can solve the problems of limited reducing effect and high copper content in waste slag, and achieves the advantages of improving matte grade, reducing equipment maintenance costs and prolonging service life. Effect

Inactive Publication Date: 2010-10-27
KUNMING UNIV OF SCI & TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction of diesel oil has a limited effect on reducing the magnetic iron oxide content in the slag, so the copper content in the waste slag is relatively high (Cu>0.7%)

Method used

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  • Method for eliminating magnetic iron oxide furnace accretion produced in copper sulfide concentrate pyrometallurgical process
  • Method for eliminating magnetic iron oxide furnace accretion produced in copper sulfide concentrate pyrometallurgical process
  • Method for eliminating magnetic iron oxide furnace accretion produced in copper sulfide concentrate pyrometallurgical process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]Traditional oxygen-enriched bottom-blown smelting process: on the bottom-blown furnace (Φ4.4×16.5m) supporting the annual output of 65,000 tons of blister copper, the furnace can process 40 tons of copper concentrate per hour, and the input sulfide Copper concentrate contains Cu 22.14%, Fe 19.16%, SiO 2 8.00%, mixed with conventionally required flux and fuel, controlled normal blast pressure 0.4-0.6MPa, blown oxygen-enriched air volume to 12500Nm 3 / h, enriched oxygen (volume) concentration is 65%, molten pool temperature is 1180-1210°C, and the obtained copper matte grade is 55%. During the matte smelting process, the system of continuous overflow slagging from the slag outlet and continuous siphoning of matte from the matte outlet is adopted. After 20 hours of smelting operation, the blast pressure rose to 0.7-0.8Mpa, and the air supply gradually became difficult. According to the requirements of the operating procedures, the operation of removing the tuyere knots i...

Embodiment 2

[0056] What is different from Example 1 is: additionally throwing 18.6 tons of waste miscellaneous copper (average Cu 11%) and 3 tons of quartz stone with a purity of 90% in the bottom blowing furnace with the feeding belt (the addition of quartz is based on Fe / SiO in slag 2 The ratio is determined between 1.2 and 1.8, iron comes from copper concentrate, and SiO will also be brought into the concentrate 2 , but the amount is usually not enough, and additional flux, that is, quartz stone, needs to be added to achieve the iron-silicon ratio set in the slag. Fe / SiO in this embodiment 2 The ratio is set to 1.3), anthracite (26.5MJ / kg) 0.4 tons. After 72 hours of smelting operation, the blast pressure is still maintained in the normal range of 0.4-0.6Mpa, and the air supply is smooth, eliminating the need to remove the tuyere knots once a day. The grade of the obtained copper matte is 70%, and the composition of the slag is shown in Table 2 after testing.

[0057] Table 2 Fe of...

Embodiment 3

[0060] Oxygen-enriched top-blown matte (grade 56%) with an annual output of 270,000 tons of matte (grade 56%) is a settling-cleaning separation electric furnace (also known as a depletion electric furnace in the industry) with a furnace size of 21.5×6×4.7 meters and 6 electrodes. The traditional process is that the electric furnace receives 86 tons of slag-matte mixed melt (the mixed melt contains 26.21% copper, 12.6% FeS, and the smelting slag contains 7.5% magnetic iron oxide) sent by the top-blown furnace every hour, and is fed by the converter. The sent 21 tons of blowing slag (the blowing slag contains 46% magnetic iron oxide), keep the furnace temperature at 1180 ℃ ~ 1220 ℃, the electric furnace power is maintained at 4870 kwh per hour, and spray into the electric furnace molten pool every hour Add 240 liters of No. 0 diesel oil. Through the dilution of the electric furnace, 41 tons of matte (grade 56%) and 63.7 tons of waste slag are obtained per hour. The waste slag co...

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Abstract

The invention relates to a method for eliminating magnetic iron oxide furnace accretion produced in a copper sulfide concentrate pyrometallurgical process. The method is characterized in that a proper amount of scrap copper and quartz are put in a weld pool in the metallurgical process on the basis of a traditional technology, elementary substance copper in the scrap copper replaces FeS in fusant to generate Fe elementary substance, Fe reacts with magnetic iron oxide (main component of furnace accretion) in the weld pool to obtain FeO, the added quartz and the FeO generate fayalite slag and thereby the magnetic iron oxide can be eliminated. The technology can be implemented during smelting, converting, continual copper smelting or the clarification separation process of a slag and sulfide mixed fusant electric furnace. The invention has the advantages that the copper matte grade can be improved, the copper contained in slag is reduced, the furnace condition is improved and the superiority of the separation of copper and impurities in the scrap copper is realized.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a method for eliminating magnetic iron oxide knots generated in the pyrometallurgy process of copper sulfide concentrate. Background technique [0002] The chemical essence of copper smelting with copper sulfide ore as raw material is desulfurization and iron removal. Due to the low smelting intensity of the traditional smelting method and the low oxygen potential of the system, although the hazards of magnetic iron oxide exist, they are not prominent. The development trend of modern copper metallurgy is strong oxidation smelting. Due to the high oxygen potential of the system, high smelting intensity, and high copper matte grade, the increase in the content of magnetic iron oxide in various slags is the cause of the increase in copper content in slag and the formation of furnace knots. important reason. After the oxidation reaction, part of the iron in the charge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B15/00
CPCY02P10/20
Inventor 沈强华黄善富阴树标王勤陈雯王勇刘中华钟华俞飞李永祥廖应东聂新如
Owner KUNMING UNIV OF SCI & TECH
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