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A method for preparing glass ceramics using waste rare earth polishing powder

A rare earth polishing powder and glass ceramic technology, applied in glass forming, glass manufacturing equipment, manufacturing tools, etc., can solve problems such as effective treatment of lead-free tailings

Active Publication Date: 2020-10-23
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent successfully recovered rare earth polishing powder, it did not effectively treat the lead-containing tailings after recovery of rare earth

Method used

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  • A method for preparing glass ceramics using waste rare earth polishing powder
  • A method for preparing glass ceramics using waste rare earth polishing powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing glass ceramics by using waste rare earth polishing powder, comprising the following steps:

[0031] (1) Weigh 30.006g of waste rare earth polishing powder and put it into a mold, place it in a high-temperature furnace, and pre-burn it at 400°C for 20 minutes;

[0032] (2) Pack the waste rare earth polishing powder after pre-burning into the mould, and use a molding pressure of 1000N to compact the waste rare earth polishing powder;

[0033] (3) Put the compressed rare earth polishing powder into the mold, put it into a high-temperature furnace, and heat it at 5°C min -1 The heating rate was raised to 650°C, and sintered at a constant temperature for 30 minutes;

[0034] (4) Then at 5°C·min -1 The heating rate was raised to 800°C, crystallized at a constant temperature for 30 minutes, and finally air-cooled to room temperature to make a glass ceramic sample.

[0035] The main components of waste rare earth polishing powder are: CeO 2 Ingredient...

Embodiment 2

[0038] A method for preparing glass ceramics by using waste rare earth polishing powder, comprising the following steps:

[0039] (1) Weigh 30.012g of waste rare earth polishing powder and put it into a mold, place it in a high-temperature furnace, and pre-fire it at 500°C for 90min;

[0040] (2) Pack the waste rare earth polishing powder after pre-burning into the mould, and use a molding pressure of 4000N to compact the waste rare earth polishing powder;

[0041] (3) Put the compressed rare earth polishing powder into the mold, put it into a high-temperature furnace, and heat it at 5°C min -1 The heating rate was raised to 750°C, and sintered at a constant temperature for 200 minutes;

[0042] (4) Then at 5°C·min -1 The heating rate was raised to 900°C, crystallized at a constant temperature for 200 minutes, and finally air-cooled to room temperature to make a glass ceramic sample.

[0043] The main components of waste rare earth polishing powder are: CeO 2 Ingredient 2%...

Embodiment 3

[0046] A method for preparing glass ceramics by using waste rare earth polishing powder, comprising the following steps:

[0047] (1) Weigh 30.009g of waste rare earth polishing powder and put it into a mold, place it in a high-temperature furnace, and pre-fire it at 450°C for 70min;

[0048] (2) Pack the waste rare earth polishing powder after pre-burning into the mould, and use a molding pressure of 2500N to compact the waste rare earth polishing powder;

[0049] (3) Put the compressed rare earth polishing powder into the mold, put it into a high-temperature furnace, and heat it at 10°C min -1 The heating rate was raised to 700°C, and sintered at a constant temperature for 120 minutes;

[0050] (4) Then at 10°C·min -1 The heating rate was raised to 850°C, crystallized at a constant temperature for 120 minutes, and finally air-cooled to room temperature to make a glass ceramic sample.

[0051] The main components of waste rare earth polishing powder are: CeO 2 Composition...

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Abstract

The invention belongs to the fields of comprehensive utilization of resources and harmless treatment of dangerous solid wastes and in particular relates to a method for directly preparing glass ceramics by utilizing waste rare-earth polishing powder. The method comprises the following steps: pre-sintering waste rare-earth polishing powder at a certain temperature for 20-90 minutes, filling the pre-sintered rare-earth polishing powder into a mold, and performing compression molding; adding into a high-temperature furnace, and sintering at a certain temperature for 30-200 minutes; and maintaining the temperature for 30-200 minutes after a devitrification temperature is reached according to a certain temperature rise rate, and air cooling to room temperature, thereby preparing the glass ceramic product. According to the method disclosed by the invention, harmlessness, reduction and recycling of the waste rare-earth polishing powder can be realized, the traditional thinking of separating and purifying valuable components from wastes is broken, the waste rare-earth polishing powder is directly and comprehensively utilized, the process flow is simplified, the energy consumption is reduced, and the aim of recycling the dangerous wastes is achieved.

Description

technical field [0001] The invention belongs to the environmental protection field of comprehensive utilization of resources and harmless treatment of hazardous solid waste, and specifically relates to a method for directly preparing glass ceramics through harmless treatment of waste rare earth polishing powder. Background technique [0002] After entering the 21st century, with the rapid development of optics and electronic information science and technology, people's demand for optical glass continues to increase, and the market for rare earth polishing powder is also expanding. It is estimated that my country's current annual output of rare earth polishing powder is nearly 50,000 tons, ranking first in the world, and increasing at a rate of 30% every year. At the same time, my country is rich in cerium resources. According to estimates, its industrial reserves are about 18 million tons (in terms of CeO 2 This has laid a solid material foundation for the rapid development...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/00C03C1/02C03C4/20C03B19/06C03B32/02
Inventor 姜茂发付杰蒋昆黄娅琴
Owner NORTHEASTERN UNIV LIAONING
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