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A kind of silica slag glass-ceramics and preparation method thereof

A technology of glass-ceramics and silicon slag, which is applied in the field of glass-ceramics and its preparation, can solve the problems of land occupation and environmental pollution, and achieve the goals of reducing pollution, reducing production costs, excellent physical and mechanical properties and chemical stability Effect

Inactive Publication Date: 2017-07-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, only a small amount of silicon smelting waste is used to make low-value-added products such as insulation boards and silicate felts, and some are even stored naturally, occupying land and polluting the environment

Method used

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  • A kind of silica slag glass-ceramics and preparation method thereof
  • A kind of silica slag glass-ceramics and preparation method thereof
  • A kind of silica slag glass-ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Crush silicon smelting waste and various mineral auxiliary materials, then pass through a 20-mesh sieve, accurately weigh 72.0-76.0 kg of silicon smelting waste, 13.0-15.0 kg of limestone or calcite (CaCO 3 ), 9.0-11.0 kg fluorite (CaF 2 ), 2.0-4.0 kg zinc oxide (ZnO), 1.0-3.0 kg aluminum oxide (Al 2 o 3 ), 0.5-2.0 kg ammonium nitrate (NH 4 NO 3 ). Fully mix silicon smelting waste slag, auxiliary raw materials and flux clarifying agent, and add 4.0% water of the total weight of raw materials during the mixing process, and stir for 10 minutes to mix evenly to form the basic glass batch material.

[0039] The basic glass batch material is sent into the melting furnace through the conveyor belt or the unit tank, the melting temperature is controlled at 1470-1500 ° C for 2.0-6.0 hours, homogenized and clarified to make qualified glass liquid; the clarified glass liquid flows through the liquid The hole enters the working part of the melting furnace, the temperature dro...

Embodiment 2

[0044] Crush various mineral auxiliary materials, then pass through a 20-mesh sieve, and accurately weigh 14.0-15.5 kg of limestone or calcite (CaCO 3 ), 10.0-11.0 kg fluorite (CaF 2 ), 10.0-13.0 kg potassium carbonate (K 2 CO 3 ), 2.5-3.5 kg zinc oxide (ZnO), 1.0-2.0 kg aluminum oxide (Al 2 o 3 ), 0.5-2.0 kg ammonium nitrate (NH 4 NO 3 ), 1.0-3.0 kg ammonium nitrate (NH 4 NO 3 ). Thoroughly mix the above auxiliary raw materials and fluxing and clarifying agent, add 3.0-4.0% water of the total weight of auxiliary raw materials and fluxing and clarifying agent, stir for 10-15 minutes and mix evenly to form a premix.

[0045] Add the premixed material to 39.0-41.0 kg of high-temperature molten silicon smelting waste slag, control the melting temperature at 1460-1480 ° C for 2.0-4.0 hours, homogenize and clarify to make qualified molten glass; the clarified molten glass flows through The hole enters the working part of the melting furnace, the temperature drops to 1120-1...

Embodiment 3

[0050] Crush various mineral auxiliary materials, then pass through a 20-mesh sieve, and accurately weigh 11.0-13.0 kg of quartz sand (SiO 2 ), 14.0-16.0 kg of limestone or calcite (CaCO 3 ), 10.0-11.0 kg fluorite (CaF 2 ), 3.0-5.0 kg potassium carbonate (K 2 CO 3 ), 1.5-3.0 kg zinc oxide (ZnO), 1.3-2.5 kg aluminum oxide (Al 2 o 3 ), 0.5-0.8 kg ammonium nitrate (NH 4 NO 3 ), 0.5-1.3 kg sodium nitrate (NaNO 3 ). Thoroughly mix the above auxiliary raw materials and fluxing and clarifying agent, add 5.0-6.0% water of the total weight of auxiliary raw materials and fluxing and clarifying agent, stir for 10-15 minutes and mix evenly to form a premix.

[0051] Add the premixed material to 60-62 kg of high-temperature molten silicon smelting waste slag, control the melting temperature at 1470-1530°C for 2.0-6.0 hours, homogenize and clarify to make qualified molten glass; the clarified molten glass flows through The hole enters the working part of the melting furnace, the te...

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Abstract

The invention relates to silicon-slag microcrystalline glass and a preparation method thereof. Silicon smelting waste slag is taken as a major raw material, and silicon dioxide or silica sand (SiO2), fluorite (CaF2), limestone or calcite (CaCO3), industrial sodium carbonate (Na2CO3), zinc oxide (ZnO) and potassium carbonate (K2CO3) are taken as auxiliary raw materials, wherein the dosage of the silicon smelting waste slag in the raw materials of the microcrystalline glass is 26.0-75.0wt%. The preparation method specifically comprises the following steps of: evenly mixing cold-state silicon slag with other auxiliary raw materials in a blender mixer to obtain a basic mixed batch, melting the basic mixed batch into qualified glass liquid in a melting furnace, and then performing calendering, casting or water quenching on the glass liquid to form a basic glass plate or granules; finally, subjecting the basic glass plate to crystallization heat treatment to obtain the microcrystalline glass. The density of the microcrystalline glass is 2.5-2.8 g / cm<3>, the rupture strength of the microcrystalline glass is 30.0-103.5 MPa, the compressive strength of the microcrystalline glass is 70.0-903.0 MPa, the Moh's hardness of the microcrystalline glass is 5-8 and the abrasive resistance of the microcrystalline glass is 0.063-0.15 g / cm<2>; the silicon-slag microcrystalline glass can be widely applied to the fields such as chemical engineering, metallurgy, architectural ornament, petroleum, mine and machinery.

Description

technical field [0001] The present invention relates to a glass-ceramic and its preparation method, especially to a glass-ceramic prepared from silicon slag produced in the industrial silicon smelting and refining process and its preparation method. It has good physical and mechanical properties, strong chemical stability, and excellent processing performance. It can replace high-strength and wear-resistant engineering glass-ceramics such as natural stone, ceramic tiles and other decorative materials or some engineering materials. Background technique [0002] In the process of producing polysilicon by metallurgical method, slagging oxidation refining has many advantages such as simple process, low cost and less pollution. The slagging oxidation refining process is to add refining slag with a higher melting point than metallurgical silicon to metallurgical silicon, and perform oxidation refining between the melting points of silicon and slag. Usually when the ratio of slag ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/04C03C10/16
Inventor 曹建尉王志赵庆朝
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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