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A method for producing nickel-containing molten iron by smelting reduction of liquid nickel slag

A technology for nickel molten iron and nickel slag, which is applied in the field of comprehensive utilization of non-ferrous metal waste slag, can solve the problems of complicated process steps, low resource recovery rate, large energy consumption, etc., and achieves the effect of short process flow, good economic benefits, and comprehensive utilization.

Active Publication Date: 2016-08-24
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for producing nickel-containing molten iron by smelting reduction of liquid nickel slag. The method has the characteristics of simple process flow, qualified molten iron quality, and low production cost. In addition, the method can solve the traditional utilization process of nickel slag. The problems of large energy consumption, complicated process steps and low resource recovery rate have realized the efficient utilization of sensible heat of liquid nickel slag and the comprehensive recovery of iron and nickel metal elements in nickel slag.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] In example 1, the main chemical composition of liquid nickel slag is as follows (by mass): TFe 37.55%, FeO 40.72%, SiO 2 38.41%, CaO 1.47%, MgO 1.31%, Al 2 o 3 3.38%, Ni 0.03%. In Example 1, calcium carbide is used as the reducing agent, the particle size of calcium carbide is 5 mm, and the gas generation capacity is 250 L / kg.

[0026] The process steps are as follows: add 100kg of liquid nickel slag and 20kg of calcium carbide into the smelting reduction furnace, and react with electromagnetic stirring for 20 minutes. After the reaction, the nickel-containing molten iron is in the lower layer of the smelting reduction furnace, and the molten slag is in the upper layer of the nickel-containing molten iron. It is found through testing that the nickel content in the nickel-containing iron water is 0.07%, and the P and S contents meet the steelmaking pig iron standard.

example 2

[0028] In example 2, the main chemical composition of liquid nickel slag is as follows (by mass): TFe 37.55%, FeO 40.72%, SiO 2 38.41%, CaO 1.47%, MgO 1.31%, Al 2 o 3 3.38%, Ni 0.03%. In Example 1, calcium carbide is also used as the reducing agent, the particle size of calcium carbide is 200 mm, and the gas generation capacity is 305 L / kg.

[0029] The process steps are as follows: 100kg of liquid nickel slag and 15kg of calcium carbide are added to the smelting reduction furnace, and reacted by mechanical stirring for 120 minutes. After the reaction, the nickel-containing molten iron is in the lower layer of the smelting reduction furnace, and the molten slag is in the upper layer of the nickel-containing molten iron. It is found through testing that the nickel content in the nickel-containing iron water is 0.07%, and the P and S contents meet the steelmaking pig iron standard.

example 3

[0031] In example 3, the main chemical composition of liquid nickel slag is as follows (by mass): TFe 39.28%, FeO 50.41%, SiO 2 32.6%, CaO 2.42%, MgO 8.88%, Al 2 o 3 2.31%, Ni 0.12%. In Example 3, calcium carbide is also used as the reducing agent, the particle size of calcium carbide is 20 mm, and the gas generation capacity is 300 L / kg.

[0032] The process steps are as follows: Add 100kg of liquid nickel slag and 18kg of calcium carbide into the smelting reduction furnace, and stir and react with gas for 60 minutes. After the reaction, the nickel-containing molten iron is in the lower layer of the smelting reduction furnace, and the slag is in the upper layer of the molten iron. The nickel content of the molten iron is 0.3 %, the content of P and S meets the steelmaking pig iron standard.

[0033] Furthermore, in Examples 1 to 3, the obtained nickel-containing molten iron can be directly used for steelmaking, and the obtained slag can be used for the production of buildi...

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Abstract

The invention provides a method for producing nickel-containing molten iron by smelting and reducing liquid-state nickel slag. The method comprises the following steps: feeding liquid-state nickel slag and a reducing agent into a smelting and reducing furnace according to a predetermined mass ratio; enabling the liquid-state nickel slag and the reducing agent to react in the smelting and reducing furnace, and stirring at the same time; and generating nickel-containing molten iron and smelting slag after the reaction is ended, wherein the nickel-containing molten iron is at the lower layer of the smelting and reducing furnace, and the smelting slag is at the upper layer of the nickel-containing molten iron. The nickel-containing molten iron can be directly used for steelmaking, and the obtained smelting slag can be used for producing building materials. The method for producing the nickel-containing molten iron by smelting and reducing liquid-state nickel slag, which is provided by the invention can realize energy-saving production, comprehensive utilization of resources and good economic benefits.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of non-ferrous metal waste slag, and more specifically relates to a method for producing nickel-containing molten iron by smelting reduction of liquid nickel slag. Background technique [0002] Nickel slag is molten waste slag discharged from nickel concentrate in converter blowing and iron removal process, and the discharge temperature is 1200°C to 1300°C. The discharged molten waste slag contains about 40% iron and about 0.3% nickel by weight, and is a ferrous metallurgical resource with recovery value. A lot of research has been done on the comprehensive utilization of nickel slag resources, and the process mainly focuses on two aspects: one is to use molten nickel slag to recover iron by smelting reduction, the advantage is that the sensible heat of slag can be used; the other is to use water-quenched nickel The slag adopts the method of direct reduction to recover iron. [0003] Yu ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C22B7/04C22B23/02
CPCY02P10/20
Inventor 高建军王锋郭玉华张俊齐渊洪严定鎏
Owner CENT IRON & STEEL RES INST
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