Method and equipment for depleting furnace slag of electric melting furnace of side-blowing melting pool

A melting pool smelting and electric furnace technology, applied in the direction of lighting and heating equipment, process efficiency improvement, etc., can solve the problems of nickel content in the waste slag not meeting the requirements, high power, increased power consumption, etc., and achieve good reduction reaction Effects of kinetic conditions, system configuration simplification, and reduction of side effects

Inactive Publication Date: 2012-10-17
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process easily leads to the formation of magnetic iron oxide knots in the sinking electric furnace; in order to increase the furnace temperature and reduce the formation of furnace knots, the input power of the sinking electric furnace electrodes is high, which will produce the side effect of electric stirring the molten pool; in the area between the electrodes Add reducing agent and vulcanizing agent to carry out various reactions, and the sedimentation and separation conditions of slag matte are destroyed
Due to these shortcomings in the traditional slag electric furnace depletion process, despite the increased power consumption and reducing agent consumption, the index of reducing the nickel content in the waste slag still cannot meet the requirements

Method used

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  • Method and equipment for depleting furnace slag of electric melting furnace of side-blowing melting pool
  • Method and equipment for depleting furnace slag of electric melting furnace of side-blowing melting pool
  • Method and equipment for depleting furnace slag of electric melting furnace of side-blowing melting pool

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Effect test

Embodiment 1

[0029] The oxygen-enriched top-blown nickel smelting system feeds 84 tons of smelting slag (containing Fe 3 o 4 7.5% and 0.9% Ni) to the electric furnace for melting in the side-blowing molten pool. The refractory brick lining of the electric furnace is not easy to fall, and the masonry is convenient; the geometric size of the furnace is conducive to the uniform distribution of the temperature field. The power of the electric furnace is maintained at 8500 kWh per hour, and the furnace temperature is kept at 1330 ° C ~ 1380 ° C. Use a spray gun to inject coal-based reducing agent (68% fixed carbon, 18% volatile matter, 5.5% sulfur, particle size less than 5mm) from the inclined socket of the spray gun Spray into the molten pool in the reduction zone of the electric furnace, the injection rate of the reducing agent is controlled at 25kg / min per gun, and the compressed air volume for transporting the reducing agent is 500Nm 3 / h·Only one gun, the slag is discharged from the sla...

Embodiment 2

[0032] Converting slag (containing Fe 3 o 4 8.2% and 1.6% Ni), sent to the side-blown molten pool smelting electric furnace for dilution treatment, and 21 tons of blowing slag was input per hour. The hearth size of the electric furnace is Φ4×13.5 meters, 3 electrodes, and a spray gun is installed on each side wall of the reduction zone. The power of the electric furnace is maintained at 4600 kWh per hour, and the furnace temperature is kept at 1240 ° C to 1300 ° C. Use a spray gun to inject a coal-based reducing agent (76% fixed carbon, 10% volatile matter, 3.8% sulfur, and a particle size of less than 5mm) from the inclined socket of the spray gun. Spray into the molten pool in the reduction zone of the electric furnace, the injection rate of the reducing agent is controlled at 9kg / min per gun, and the compressed air volume for transporting the reducing agent is 180Nm 3 / h · gun. After being diluted, the slag is discharged intermittently from the slag outlet of the electric...

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Abstract

The invention discloses a method and equipment for depleting the furnace slag of an electric melting furnace of a side-blowing melting pool. The method comprises the following steps of: putting molten slag produced in the nickel melting process or blown slag produced in the process of blowing low-nickel sulfonium into high-nickel sulfonium into a reduction zone of the electric melting furnace of the side-blowing melting pool, controlling the temperature of the furnace to be in a range of 1300 DEG C-1400 DEG C, and injecting a reducing agent into an inclined inserting port of a spraying gun of the electric furnace. By adopting the method in the invention, slag-type optimization of the furnace slag containing nickel, transformation from nickel chemically dissolving in the slag into sulfonium I and separation of the slag and the sulfonium are finished in the electric melting furnace of the side-blowing melting pool. The invention has the advantages that reducing and slag making reaction of magnetic iron oxide, sulfonium making reaction and slag-sulfonium settlement and separation are finished at different zones in one side-blowing electric furnace; the nickel content in the waste slag is low; and the foaming of the furnace slag is avoided and the operation process is smooth and safe.

Description

technical field [0001] The invention provides a method and equipment for depleting slag in a side-blowing molten pool smelting electric furnace, belonging to the technical field of nonferrous metal metallurgy. Background technique [0002] The chemical essence of matte produced by smelting nickel sulfide ore as raw material is desulfurization and iron removal, and the slag collected by oxides and nickel matte fused by sulfide are obtained. Since slag and matte are incompatible with each other and have a large density difference, they can be separated in layers . Due to the low smelting intensity and the low oxygen potential of the system in the traditional smelting method, the FeS and O in the concentrate 2 The reaction produces FeO, which can form slag with the flux, and FeO will continue to be oxidized to Fe 3 o 4 phenomenon is not prominent. The development trend of modern matte-making smelting is oxygen-enriched intensified smelting to produce high-grade matte. Due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B3/08F27B3/10C22B7/04C22B23/00
CPCY02P10/20
Inventor 沈强华陈雯刘中华熊伟
Owner KUNMING UNIV OF SCI & TECH
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