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A method of directly sintering asbestos tailings to prepare functional glass-ceramics

A technology of asbestos tailings and glass-ceramics, which is applied in glass forming, glass manufacturing equipment, manufacturing tools, etc., can solve the problems of long process flow, cumbersome process, and high energy consumption in production, and achieve simple process flow and facilitate industrial promotion , the effect of high added value

Active Publication Date: 2022-03-18
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both the bulk crystallization method and the melting and sintering method contain a high-temperature melting process, and both require a secondary high-temperature treatment process, so there are disadvantages or defects such as high energy consumption, long process flow, cumbersome procedures, and low utilization rate of industrial waste residues.
In addition, judging from the existing research situation, glass-ceramics prepared from industrial solid wastes are usually used as structural materials, so the research focus is mainly on how to improve the mechanical properties, while there is little research on functionalization. Low added value limits the commercialization of glass-ceramics
[0005] To sum up, the existing mainstream production process of using asbestos tailings to prepare glass-ceramics - integral crystallization method and melting sintering method has problems such as high production energy consumption, long process flow, and low utilization rate of waste slag, and has not yet been utilized. Research on the preparation of functional magnetic glass-ceramic from asbestos tailings, the product is difficult to achieve high value-added utilization

Method used

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  • A method of directly sintering asbestos tailings to prepare functional glass-ceramics
  • A method of directly sintering asbestos tailings to prepare functional glass-ceramics
  • A method of directly sintering asbestos tailings to prepare functional glass-ceramics

Examples

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Effect test

example 1

[0108] 1) After the asbestos tailings and ingredients are pretreated, weigh and mix them uniformly to obtain a glass-ceramic green body powder. Asbestos tailings chemical composition in weight percent: MgO 40%, SiO 2 35%, Fe 2 o 3 10%, CaO 6%, Al 2 o 3 1%, Cr 2 o 3 0.5%, NiO 0.3%, K 2 O 0.2%, MnO 0.1%, BaO 0.05%, Co 3 o 4 0.03%, loss on ignition 6.82%; auxiliary materials: waste glass, feldspar (that is, potassium feldspar or albite), accounting for 5% and 3% of the mass fraction of asbestos tailings respectively; pretreatment: asbestos tailings at 700 ° C After pre-roasting for 1 hour and dehydration, it is uniformly mixed with auxiliary materials and ball-milled to 50um to obtain a green body powder.

[0109] 2) Spread the glass-ceramic green body powder obtained in step 1) flatly on a forming abrasive tool, and dry-press molding with a green body forming press to obtain a glass-ceramic green body. Among them, the pressure of dry pressing is 30MPa, and the hol...

example 2

[0113] 1) After pretreatment of asbestos tailings and ingredients, weigh and mix uniformly to obtain glass-ceramic green body powder; wherein, the chemical composition of asbestos tailings is in weight percentage: MgO 38%, SiO 2 35%, Fe 2 o 3 8%, CaO 15%, Al 2 o 3 1%, Cr 2 o 3 0.5%, NiO 0.3%, K 2 O 0.2%, MnO 0.1%, BaO 0.05%, Co 3 o 4 0.02%, loss on ignition 1.83%; auxiliary materials: caustic soda, potassium feldspar, accounting for 5% and 3% of the mass fraction of asbestos tailings respectively. Pretreatment: The asbestos tailings are pre-roasted at 750°C for 1 hour, dehydrated, mixed evenly with auxiliary materials and ball-milled to 50um to obtain a green body powder.

[0114] 2) Spread the glass-ceramic green body powder obtained in step 1) flatly on a forming abrasive tool, and dry-press molding with a green body forming press to obtain a glass-ceramic green body. Among them, the pressure of dry pressing is 50MPa, and the holding time is 60s.

[0115] 3) P...

example 3

[0118] 1) After the asbestos tailings and ingredients are pretreated, weigh and mix them uniformly to obtain a glass-ceramic green body powder. Asbestos tailings chemical composition in weight percent: MgO 40%, SiO 2 38%, Fe 2 o 3 8%, CaO 6%, Al 2 o 3 1%, Cr 2 o 3 0.5%, NiO0.3%, K 2 O 0.2%, MnO 0.1%, BaO 0.05%, Co 3 o 4 0.03%, loss on ignition 5.82%; auxiliary materials: caustic soda, potassium feldspar, accounting for 5% and 3% of asbestos tailings mass fraction respectively; pretreatment: asbestos tailings are pre-roasted at 750°C for 1 hour and dehydrated, then uniformly mixed with auxiliary materials and ball milled to 50um to get bisque powder.

[0119] 2) Spread the glass-ceramic green body powder obtained in step 1) flatly on a forming abrasive tool, and dry-press molding with a green body forming press to obtain a glass-ceramic green body. The pressure of dry pressing is 80MPa, and the holding time is 60s.

[0120] 3) Place the glass-ceramic blank obtain...

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Abstract

The invention provides a method for preparing glass ceramics by directly sintering asbestos tailings. The shown method includes the steps of: pretreating the asbestos tailings and ingredients, or pretreating the asbestos tailings to obtain a green body powder; pressing the green body powder to obtain a green body; heating the green body to The green body is heated to 750-900° C. and kept warm to promote the nucleation and crystallization of the green body, and then heated to 1100-1250° C. for sintering. After the sintering is completed, it is cooled to obtain glass ceramics. The beneficial effects of the present invention may include that the utilization rate of asbestos tailings can reach 90-100%, the process flow is simple, the energy consumption is low, environmental protection, and is conducive to industrial promotion, and the prepared glass-ceramic has excellent performance and high added value.

Description

technical field [0001] The invention relates to the field of solid waste treatment and resource utilization, in particular to a method for preparing functional glass-ceramics by utilizing asbestos tailings. Background technique [0002] Asbestos tailings are the tailings produced during the mining and beneficiation of chrysotile (chrysotile asbestos), whose main phase is serpentine, and also contains a small amount of non-serpentine paragenetic or associated minerals. Due to the low cotton content of serpentine ore, about 5-10% (the content rate of western mines is about 5-7%), the current production of 1 ton of serpentine asbestos produces about 20-30 tons of tailings, and some areas even However, China's overall low utilization rate of asbestos tailings of chrysotile asbestos, coupled with historical accumulation, makes the accumulation of chrysotile asbestos tailings about 500 million tons. A large number of asbestos tailings not only occupy a large amount of land, but a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/02C03C6/02C03B19/06
CPCC03B19/06C03C1/002C03C10/0063
Inventor 孙红娟郑文苗彭同江丁文金周果
Owner SOUTHWEAT UNIV OF SCI & TECH
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