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A kind of slag porous glass-ceramic and its preparation method

A technology of porous glass-ceramics and slag, which is applied in the field of solid waste resource utilization, can solve the problems of difficult control of pore size, poor thermal conductivity, and poor uniformity of pores, so as to save processing costs, solve difficult-to-handle problems, and improve thermal insulation performance Effect

Active Publication Date: 2020-07-10
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The following problems exist in the preparation of porous glass-ceramics by using inorganic substances as pore-forming agents: 1. In order to control foaming, the foaming temperature must be matched with the melting viscosity to achieve pore-forming in the volume, which affects the composition and preparation of the basic glass. The process puts forward higher requirements, and it is difficult to achieve process control for production; 2. The mechanism of foaming is that the gas generated by the thermal decomposition of the inorganic foaming agent in the sintering process expands in the sintered body to form pores, and the size of the pores is difficult to control. Poor uniform type, mixed open and closed pores, poor thermal conductivity

Method used

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  • A kind of slag porous glass-ceramic and its preparation method
  • A kind of slag porous glass-ceramic and its preparation method
  • A kind of slag porous glass-ceramic and its preparation method

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Embodiment 1

[0048] A kind of slag porous glass-ceramic, its raw material according to proportion, basic glass powder: granulated sugar = 1.0, sodium chloride: basic glass powder = 0.7; described basic glass powder, its raw material according to weight percentage, SiO 2 43%, CaO 29%, Fe 2 o 3 5.1%, Cr 2 o 3 0.4%, Al 2 o 3 10%, Borax 4%, MgO 5.5%, Fluorite 3%.

[0049] The steps of the method for preparing the slag porous glass-ceramics include:

[0050] (1) Mixing: according to the ratio of raw materials, weigh stainless steel slag, iron tailings, Al 2 o 3 , borax, MgO, fluorite, mixed evenly, mixing time 30min;

[0051] (2) Preparation of basic glass: put the mixed raw materials into a crucible, heat and melt for 3 hours, and the melting temperature is 1400°C, quickly pour the melted glass into cold water to obtain basic glass particles, and dry them;

[0052] (3) Preparation of basic glass powder: Grinding the dried basic glass particles with a ball mill into a particle size o...

Embodiment 2

[0062] A kind of slag porous glass-ceramic, its raw material according to proportioning, basic glass powder: granulated sugar=1.1, sodium chloride: basic glass powder=0.6; Said basic glass, its raw material according to weight percentage, SiO 2 50%, CaO 31%, Fe 2 o 3 5%, Cr 2 o 3 1%, Al 2 o 3 5%, Borax 3%, MgO 3%, Fluorite 2%.

[0063] The steps of the method for preparing the slag porous glass-ceramics include:

[0064] (1) Mixing: according to the ratio of raw materials, weigh stainless steel slag, iron tailings, Al 2 o 3 , borax, MgO, fluorite, mixed evenly, mixing time 30min;

[0065] (2) Preparation of basic glass: Put the mixed raw materials into a crucible, heat and melt for 2 hours, the melting temperature is 1450°C, quickly pour the melted glass into cold water to obtain basic glass particles, and dry them;

[0066] (3) Preparation of basic glass powder: Grinding the dried basic glass particles with a ball mill into a particle size of -200 mesh basic glas...

Embodiment 3

[0076] A kind of slag porous glass-ceramic, its raw material according to proportion, basic glass powder: flake sugar = 1.2, potassium chloride: basic glass powder = 0.8; described basic glass, its raw material according to weight percentage, SiO 2 50%, CaO 24%, Fe 2 o 3 8%, Cr 2 o 3 2.5%, Al 2 o 3 6.5%, Borax 2%, MgO 3%, Fluorite 4%.

[0077] The steps of the method for preparing the slag porous glass-ceramics include:

[0078] (1) Mixing: according to the ratio of raw materials, weigh stainless steel slag, iron tailings, Al 2 o 3 , borax, MgO, fluorite, mixed evenly, mixing time 30min;

[0079] (2) Preparation of basic glass: put the mixed raw materials into a crucible, heat and melt for 3 hours, and the melting temperature is 1350°C, quickly pour the melted glass into cold water to obtain basic glass particles, and dry them;

[0080] (3) Preparation of basic glass powder: Grinding the dried basic glass particles with a ball mill into a particle size of -200 mes...

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Abstract

The invention relates to a slag porous glass-ceramic and a preparation method thereof, wherein the raw materials of the glass-ceramic include a base glass powder, a binder and a pore-forming agent, wherein the raw materials are proportioned according to the mass ratio of the pore-forming agent to the base glass powder = (0.6-0.8): 1, and the base glass powder to the binder = (1.0-1.2): 1. The preparation method comprises the following steps: after the base glass powder is prepared, mixing the base glass powder with the binder and the pore-forming agent, drying, press molding, sintering and impregnating to form a first-order pore, then forming a second-order pore through secondary heating and heat preservation, and processing to obtain slag porous glass-ceramics. The pore-forming agent usedin the method of the invention is non-toxic and can be recycled, and the prepared glass-ceramics are hierarchical multi-pore structure, and compared with the traditional bricks, the prepared glass-ceramics have the advantages of light weight, heat insulation, heat preservation, energy saving, environmental protection and the like.

Description

Technical field: [0001] The invention belongs to the technical field of resource utilization of solid waste, and in particular relates to a slag porous glass-ceramic and a preparation method thereof. Background technique: [0002] With the development of the iron and steel industry, the output of iron and steel metallurgical slag is increasing. In 2010, the output of stainless steel slag in my country reached 11.3 million tons, and 2.26 million tons of stainless steel slag was produced. Stainless steel slag is different from other metallurgical slags because it contains heavy metal chromium. The leaching rate of heavy metal chromium has serious environmental risks and belongs to hazardous waste. At present, the stainless steel slag of various stainless steel manufacturers at home and abroad is piled up in slag yards, prepared into cement, and built roads, etc. The piled up stainless steel slag is easy to seep Cr 3+ And oxidized to Cr in natural environment 6+ At the same t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C11/00C03C10/00C03C6/10C03B19/08C03B19/06C03B32/02
CPCC03B19/06C03B19/08C03B32/02C03C1/002C03C10/0036C03C10/0063C03C11/007
Inventor 薛向欣于洪浩李万礼杨合程功金
Owner NORTHEASTERN UNIV LIAONING
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