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Method for producing fireproof black cotton by using red mud

A technology of red mud and black cotton, applied in the field of comprehensive utilization of solid waste resources, can solve problems affecting the sustainable development of the aluminum industry, multi-yard construction and maintenance costs, dust flying with the wind, etc., to achieve small high-temperature line shrinkage, high Effect of melting point, hygroscopicity and low water absorption

Pending Publication Date: 2022-07-29
王进
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most alumina production enterprises transport red mud to storage yards and build dams to store it in the open air. Stacking red mud not only takes up a lot of land, but also consumes more storage yard construction and maintenance costs, and the dust formed by exposed red mud is blown by the wind. , pollute the atmosphere, negatively affect the survival of human beings, animals and plants, bring serious environmental problems, and cause the environmental protection pressure of the aluminum industry to increase sharply, which has become a thorny issue affecting the sustainable development of the aluminum industry. Value-added technology is the key to solving red mud problem

Method used

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  • Method for producing fireproof black cotton by using red mud
  • Method for producing fireproof black cotton by using red mud
  • Method for producing fireproof black cotton by using red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Taking the high iron red mud generated after using the Bayer method to prepare alumina in Table 1 Shandong region as a raw material to produce fire-resistant black cotton, the concrete method is as follows:

[0032] (1) Ingredients

[0033] After calculation, 70 parts of red mud are used, and other ingredients are as follows: 3 parts of silica sand, 4 parts of reducing agent C (reducing agent is not included in the content of red mud ingredients balls), and 27 parts of limestone. The acidity coefficient of the mixed red mud ingredient balls is 1.9, and the viscosity coefficient is 1.

[0034] (2)Mixing balls

[0035] After the red mud and ingredients are uniformly mixed, a ball-shaped charge with a diameter of 3.5 cm is made to obtain red mud ingredients balls. The red mud batching pellets are naturally dried by storage, and the mechanical strength requires that the free fall damage rate is less than 1% at a height of 1m.

[0036] (3) Drying, preheating and dehydrati...

Embodiment 2

[0047] Take the high-speed iron red mud of table 1 Chongqing Bayer method as raw material ingredient to produce fire-resistant black cotton fiber, and the concrete method is as follows:

[0048] (1) Ingredients

[0049] After calculation, 87 parts of red mud are used, and other ingredients are as follows: Other ingredients are as follows: 3 parts of silica sand, 10 parts of dolomite sand. The acidity coefficient of the mixed red mud ingredient pellets is 2.0, and the viscosity coefficient is 1.1.

[0050] (2)Mixing balls

[0051] After the red mud and ingredients are uniformly mixed, a ball-shaped charge with a diameter of 3.5 cm is made to obtain red mud ingredients balls. The red mud batching pellets are naturally dried by storage, and the mechanical strength requires that the free fall damage rate is less than 1% at a height of 1m.

[0052] (3) Drying, preheating and dehydration

[0053]It is produced in an electric melting furnace. The red mud batching balls are dried ...

Embodiment 3

[0064] Produce red mud black cotton fiber with table 3-Chongqing Bayer method, sintering method red mud mixed ingredients, concrete method is as follows:

[0065] (1) Ingredients

[0066] After calculation, 90 parts of mixed red mud (including 70 parts of Bayer process red mud and 30 parts of sintering process red mud) were used. The other ingredients are as follows: 10 parts of silica sand. The acidity coefficient of the mixed red mud ingredient pellets is 2.0, and the viscosity coefficient is 1.0.

[0067] (2)Mixing balls

[0068] After the red mud and ingredients are uniformly mixed, a ball-shaped charge with a diameter of 3.5 cm is made to obtain red mud ingredients balls. The red mud batching pellets are naturally dried by storage, and the mechanical strength requires that the free fall damage rate is less than 1% at a height of 1m.

[0069] (3) Drying, preheating and dehydration

[0070] It is produced in an electric melting furnace. The red mud batching balls are d...

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Abstract

The invention relates to a method for producing fireproof black cotton by using red mud, and belongs to the technical field of comprehensive utilization of solid waste resources. Comprising the following steps: (1) burdening; (2) mixing and pelletizing; (3) drying / preheating dehydration; (4) melting; (5) discharging; during material melting, the melting temperature is controlled to be 1450-1650 DEG C. According to the method disclosed by the invention, the content of iron in the fiber is effectively controlled and improved by burdening the Bayer process red mud, burdening the Bayer process red mud and mixing the Bayer process red mud and the sintering process red mud and controlling the MK value, the MB value, the furnace temperature and the reducing agent parameters, so that the red mud can be comprehensively utilized to produce fireproof black cotton series products.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste resources, and particularly relates to a method for producing fire-resistant black cotton by utilizing red mud. Background technique [0002] Red mud is a red muddy waste discharged from the alumina industry, which is a strong alkaline and harmful residue. At present, most alumina production enterprises transport red mud to storage yards and build dams for storage in the open air. Red mud storage not only occupies a lot of land, but also consumes a lot of storage yard construction and maintenance costs, and the dust formed by the exposed red mud flies with the wind. , polluting the atmosphere, negatively affecting the survival of humans, animals and plants, bringing serious environmental problems, resulting in a sharp increase in the environmental protection pressure of the aluminum industry, which has become a thorny problem affecting the sustainable development o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/00C03C13/06C03C6/10C22B1/248C21B11/10
CPCC03B37/00C03C13/06C03C1/002C22B1/248C21B11/10
Inventor 王进张沛源刘家明
Owner 王进
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