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Method for reducing magnesium oxide in ferronickel slag and method for preparing mineral wool

A technology of ferronickel slag and magnesium oxide, which is applied in the field of metallurgy, can solve the problems of forming solid particles, high melting point, and poor quality of mineral wool, and achieve the effect of reducing the content of magnesium oxide and improving reaction efficiency

Active Publication Date: 2021-02-05
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of magnesium oxide in some lateritic nickel ores, the content of magnesium oxide in ferronickel slag produced by ferronickel smelting exceeds the limit of magnesium oxide content required in the mineral wool preparation process, resulting in poor quality of the produced mineral wool. Very low cotton yield
In ferronickel slag with high magnesium oxide content, in addition to forming a relatively stable compound with silicon dioxide in the slag, magnesium oxide in the slag will also have some free magnesium oxide. The melting point of free magnesium oxide is high. During the heat preservation process, most of them exist in the state of solid particles. During the blowing process of molten slag, it is easy to break the cotton and form solid particles, resulting in a decrease in the cotton-forming rate of slag wool. Nickel-iron slag with a high content of magnesium oxide cannot be used as a raw material for mineral wool

Method used

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  • Method for reducing magnesium oxide in ferronickel slag and method for preparing mineral wool

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The method that present embodiment prepares slag wool, comprises following process:

[0047] The slag temperature of the ferronickel smelting furnace is 1400°C. The impregnated carbon is put into the slag bag in advance, the molten nickel-iron slag is put into the slag bag, and then the slag mixed with the impregnated carbon in the slag bag is poured into the heat preservation electric furnace. Insulated at 1500 for 1 hour, at this time, the mass percentage of magnesium oxide in the ferronickel slag was sampled and detected to be 20.5%; then it was further prepared into slag wool, and the cotton-forming rate of the obtained slag wool was increased by 5%.

[0048] Among them, in the impregnated carbon used in this embodiment, the carbonaceous material is semi-coke, the fixed carbon content in the semi-coke is 73.5%, the molar ratio of the carbon in the impregnated carbon to the magnesium oxide in the ferronickel slag is 1:2, the impregnated The molar ratio of calcium chl...

Embodiment 2

[0050] The method that present embodiment prepares slag wool, comprises following process:

[0051] The slag temperature of the ferronickel smelting furnace is 1500°C. The impregnated carbon is put into the slag bag in advance, the molten nickel-iron slag is put into the slag bag, and then the slag mixed with the impregnated carbon in the slag bag is poured into the heat preservation electric furnace. It was kept at 1550° C. for 3 hours. At this time, the mass percent content in the ferronickel slag was 17.3% by sampling and detection; then it was further prepared into slag wool, and the cotton-forming rate of the obtained slag wool was increased by 10%.

[0052] Wherein, in the impregnated carbon used in this embodiment, the carbonaceous material is semi-coke, the fixed carbon content in the semi-coke is 73.5%, the molar ratio of the carbon in the impregnated carbon to the magnesium oxide in the ferronickel slag is 1:1, and the impregnated The molar ratio of calcium chloride ...

Embodiment 3

[0054] The method that present embodiment prepares slag wool, comprises following process:

[0055] The slag temperature of ferronickel smelting slag is 1500℃, the impregnated carbon is put into the slag bag in advance, the molten nickel-iron slag is put into the slag bag, and then the slag mixed with impregnated carbon in the slag bag is poured into the heat preservation electric furnace, at 1600 At this time, the mass percentage of magnesium oxide in the ferronickel slag was 12.1% by sampling and detection; and then further prepared into slag wool, and the cotton-forming rate of the obtained slag wool was increased by 28%.

[0056] Among them, in the impregnated carbon used in this embodiment, the carbonaceous material is semi-coke, the fixed carbon content in the semi-coke is 73.5%, and the molar ratio of the carbon in the impregnated carbon to the magnesium oxide in the ferronickel slag is 1:0.5. The molar ratio of calcium chloride in carbon to magnesium oxide in ferronick...

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Abstract

The invention discloses a method for reducing magnesium oxide in ferronickel slag and a method for preparing mineral wool. In the process of preparing mineral wool by using molten ferronickel slag, impregnated carbon is added in the slagging process of a ferronickel smelting furnace, the molten ferronickel slag and the impregnated carbon are fully mixed in the transfer process of the ferronickel slag, and heat preservation is carried out in a heat preservation furnace, so that the content of magnesium oxide in the ferronickel slag is reduced; wherein the impregnated carbon preparation processcomprises the following steps: fully mixing a calcium chloride aqueous solution with a carbonaceous material, and then carrying out solid-liquid separation and drying to obtain impregnated carbon; andthe usage amount of the impregnated carbon is determined according to the content of magnesium oxide in the ferronickel slag. According to the method, the content of magnesium oxide in the ferronickel smelting slag can be reduced, particularly, magnesium oxide in a free state in the ferronickel smelting slag can be reduced, the quality of slag wool can be improved, conditions are created for large reduction and high-value utilization of the ferronickel slag containing high magnesium oxide, and recovery of magnesium in the ferronickel slag can also be achieved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for reducing magnesium oxide in ferronickel slag and a method for preparing slag wool. Background technique [0002] Ferronickel slag is the solid waste slag discharged during the process of smelting nickel-iron alloy with nickel ore, and it is the fourth largest industrial waste slag after steel slag, blast furnace slag and red mud. With the reduction of nickel sulfide ore resources, nickel oxide ore has gradually become an important resource for extracting nickel. The main mineral used in nickel oxide ore is laterite nickel ore. The process is to granulate laterite nickel ore after calcination, and then use electric furnace Carbon reduction, after carbon reduction, ferronickel products and smelting slag are produced. Ferronickel is produced from laterite nickel ore, and about 14t of ferronickel slag is discharged for every 1 ton of ferronickel produced, which is ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B26/22C01F5/30C03B37/005
CPCC22B7/04C22B7/001C22B7/002C22B26/22C01F5/30C03B37/005Y02P10/20
Inventor 王耀宁马红周
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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