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Method for producing high-strength and high-flexibility heatproof mineral wool and iron by using red mud

A slag wool, high-strength technology, applied in the field of comprehensive resource recycling, to achieve the effect of easy promotion, significant economic benefits, and maintenance of ecological balance

Active Publication Date: 2014-09-17
JILIN JIEN NICKEL IND +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] There is no literature report on the method of producing high-strength, high-flexibility, heat-resistant slag wool and iron from red mud

Method used

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  • Method for producing high-strength and high-flexibility heatproof mineral wool and iron by using red mud
  • Method for producing high-strength and high-flexibility heatproof mineral wool and iron by using red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] a. Use a dryer to dehydrate the red mud from the alumina production industry to a water content of 10%. Add 10% of reducing agent anthracite with a particle size of less than 1 mm and 25% of conditioning agent quartz stone after being ground by a ball mill. Mix thoroughly in a kneader and press into pellets with a ball press.

[0045] b. The pellets are put into the coal-fired rotary kiln for material dehydration and iron pre-reduction, and the temperature is controlled at 1000 degrees. The reduction time is 3 hours; more than 70% of the iron is reduced to metallic iron.

[0046] c. Continuously add hot pellets into the electric furnace to melt and separate iron and slag, and the melting temperature is 1400 degrees. Then the molten iron is discharged from the iron outlet, and the molten slag is discharged from the slag outlet. The molten slag is kept at 1400 degrees by a heat-retaining electric furnace and released continuously to make slag wool.

[0047] d. The reco...

Embodiment 2

[0049] a. Use a dryer to dehydrate the red mud from the alumina production industry to a water content of 15%. Add 15% of reducing agent anthracite with a particle size of less than 1 mm and 30% of conditioning agent quartz stone after being ground by a ball mill. Mix thoroughly in a kneader and press into pellets with a ball press.

[0050] b. Pellets are added to the coal-fired rotary kiln for material dehydration and iron pre-reduction, and the temperature is controlled at 1100 degrees. , Reduction 4h; More than 80% of iron is reduced to metallic iron.

[0051] c. Continuously add hot pellets into the electric furnace to melt and separate iron and slag, and the melting temperature is 1450 degrees. Then the molten iron is discharged from the iron outlet, and the molten slag is discharged from the slag outlet. The molten slag is kept at 1450 degrees by a heat-retaining electric furnace and released continuously to make slag wool.

[0052] d. The recovery rate of slag into ...

Embodiment 3

[0054] a. Dehydrate the red mud from the alumina production industry to a water content of 18% with a dryer. Add 20% of reducing agent anthracite and 40% of conditioning agent quartz stone which have been ground by a ball mill with a particle size of less than 1 mm. Mix thoroughly in a kneader and press into pellets with a ball press.

[0055] b. The pellets are added to the coal-fired rotary kiln for material dehydration and pre-reduction of iron. The temperature is controlled at 1050 degrees and the reduction is 5 hours. More than 90% of iron is reduced to metallic iron.

[0056] c. Continuously add hot pellets into the electric furnace to melt and separate iron and slag, and the melting temperature is 1500 degrees. Then the molten iron is discharged from the iron outlet, and the molten slag is discharged from the slag outlet. The molten slag is kept at 1500 degrees by a heat-retaining electric furnace and released continuously to make slag wool.

[0057] d. The recovery ...

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Abstract

The invention discloses a method for producing high-strength and high-flexibility heatproof mineral wool and iron by using red mud, and belongs to the field of comprehensive resource recycling in the non-ferrous metal metallurgy industry. The method comprises the following steps: 1, dehydrating and drying red mud, adding a reducing agent and a conditioning agent, and uniformly mixing; 2, adding pellets into a rotary kiln, and carrying out sintering pre-reduction; 3, adding hot pellets into an electric furnace, fusing, separating iron and slag, discharging molten iron through an iron outlet, and discharging the slag through a slag outlet; 4, collecting the slag discharged from the slag outlet, carrying out heat insulation by using the electric furnace, discharging, and processing to prepare the mineral wool; and 5, collecting the discharged molten iron. The method realizes the comprehensive utilization of a secondary non-ferrous metallurgy resource by using the red mud as a raw material to produce the mineral wool and iron, reduces environment pollution, maintains the ecologic balance and realizes the sustainable development. The high-strength and high-flexibility heatproof mineral wool can be produced, the recovery rates of the mineral wool and iron are high, and the economic benefit is substantial. The method also has the advantages of simple technology and easy popularization.

Description

technical field [0001] The invention belongs to the field of comprehensive recycling and utilization of resources in the metallurgical industry of non-ferrous metals, and in particular relates to a method for producing slag wool and iron from red mud. Background technique [0002] Red mud is the residue produced when bauxite is leached by strong alkali during the alumina production process. For every ton of alumina produced, 1.0 to 1.3 tons of red mud are produced. It is estimated that the world's aluminum industry produces about 60 million tons of red mud every year, and my country produces 3.8 to 4 million tons of red mud every year based on the annual processing of 6 million tons of bauxite. At present, most alumina plants around the world accumulate or pour red mud into the deep sea. The storage of red mud not only occupies a large amount of land and arable land, but also consumes more yard construction and maintenance costs. Today, as land resources become increasingl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/14C21B11/10C03B37/00C03C6/10
CPCY02P10/20
Inventor 马忠诚赵孟珊李景峰康玮明袁凤艳张东孟庆伟张春生池丕华侯俊杰李韧刘丹丹王学哲商雅文王法春
Owner JILIN JIEN NICKEL IND
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