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Molten method for preparing slag microcrystalline glass

A technology of glass-ceramics and slag, applied in the field of slag glass-ceramics and its preparation, can solve the problems of poor compactness and high utilization cost, achieve high added value, avoid waste of resources, and reduce the mining of raw materials

Inactive Publication Date: 2007-08-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above technical routes can consume industrial waste—fly ash, which has a positive effect on solving environmental pollution problems. However, due to the addition of other industrial raw materials in their utilization methods, the utilization cost is relatively high
Chinese patent application ZL200510046233.6 discloses that iron tailings, fly ash and boron mud are used as raw materials to prepare slag glass-ceramics by sintering process. Although no crystal nucleating agent is added, the glass-ceramics has certain pore defects after sintering , less dense

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The process steps are as follows.

[0019] 1. Ingredients: ingredients by weight, fly ash: 40%, boron mud: 40%, iron tailings: 20%; add Cr 2 o 3 According to the weight ratio, it accounts for 0.5% of the total amount of fly ash, iron tailings and boron mud.

[0020] 2. Mixing: Mixing fly ash, iron tailings, boron mud and Cr by ball milling 2 o 3 Mix (wherein the concrete chemical composition of fly ash, iron tailings and boron mud is as table 2), the mixing time is 150min;

[0021] 3. Melting: Put the above-mentioned mixed materials into a high-temperature furnace for melting, the melting temperature is 1500°C, and the holding time is 150 minutes;

[0022] 4. Molding: Put the molten glass above into the mold for molding;

[0023] 5. Nucleation and crystallization: Put the formed glass in a high-temperature furnace, nucleate at 750°C for 60 minutes, then raise the temperature to 980°C at a heating rate of 20°C / min, crystallize at a constant temperature for 150 minut...

Embodiment 2

[0028] The process steps are as follows.

[0029] 1. Ingredients: ingredients by weight, fly ash: 60%, boron mud: 20%, iron tailings: 20%; add Cr 2 o 3 According to the weight ratio, it accounts for 1% of the total amount of fly ash, iron tailings and boron slime (wherein the specific chemical composition of fly ash, iron tailings and boron slime is shown in Table 3).

[0030] 2. Mixing: Mixing fly ash, iron tailings, boron mud and Cr by ball milling 2 o 3 Mixing, the mixing time is 240min;

[0031] 3. Melting: Put the above-mentioned mixed materials into a high-temperature furnace for melting, the melting temperature is 1600°C, and the holding time is 60 minutes;

[0032] 4. Molding: Put the molten glass above into the mold for molding;

[0033] 5. Nucleation and crystallization: Put the formed glass in a high-temperature furnace, nucleate at 800°C for 20 minutes, then raise the temperature to 1120°C at a heating rate of 30°C / min, crystallize at a constant temperature fo...

Embodiment 3

[0038] The process steps are as follows.

[0039] 1. Ingredients: ingredients by weight, fly ash: 10%, boron mud: 30%, iron tailings: 60%; add Cr 2 o 3 According to the weight ratio, it accounts for 0.1% of the total amount of fly ash, iron tailings and boron slime (wherein the specific chemical composition of fly ash, iron tailings and boron slime is shown in Table 3).

[0040] 2. Mixing: Mixing fly ash, iron tailings, boron mud and Cr by ball milling 2 o 3 Mixing, the mixing time is 60min;

[0041] 3. Melting: Put the above-mentioned mixed materials into a high-temperature furnace for melting, the melting temperature is 1400°C, and the holding time is 240 minutes;

[0042] 4. Molding: Put the molten glass above into the mold for molding;

[0043]5. Nucleation and crystallization: Put the formed glass in a high-temperature furnace, nucleate at 700°C for 120 minutes, then raise the temperature to 850°C at a heating rate of 5°C / min, crystallize at a constant temperature fo...

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Abstract

The invention discloses a slag microcrystal glass, which comprises the following parts: 39-67% SiO2, 5-16% Al2O3, 4-11% CaO, 5-32% MgO, 6-13%T.Fe, 0.1-0.7%B2O3, 0.3-1.2% Na2O and 0.1%-1% Cr2O3. The making course is characterized by the following steps: setting the coal ash, ferric tail-ore, boron mud and Cr2O3 as material; melting; batching; blending; melting; moulding; coring; crystallizing. The invention improves microhardness to 8-10Hv (0.98N) with transverse strength at 160-194Mpa to display higher added value, which can be applied in the preservative process.

Description

technical field [0001] The invention relates to comprehensive utilization of industrial waste, in particular to slag glass-ceramics and a preparation method thereof. Background technique [0002] The problem of slag polluting the environment is becoming more and more serious with the increase of emissions, and the harm to the environment is mainly manifested in: water pollution, serious soil salinization and destruction of the natural ecological environment. Owing to the piling up of various waste residues, waste rocks and tailings, land occupation and destruction are more serious. According to data reports, the generation of fly ash in my country reached 160 million tons in 2000, and this value has increased in recent years. However, the utilization rate of fly ash is less than 50%, which is mainly extensive and simple reuse, and the utilization cost is relatively high. [0003] Chinese patent application 03128180.x discloses a cordierite glass-ceramic prepared from fly a...

Claims

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Application Information

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IPC IPC(8): C03C10/14C03C6/10C03B32/02
CPCC03C10/00C03C3/064C03C3/091
Inventor 史培阳刘承军王德永闵义姜茂发
Owner NORTHEASTERN UNIV
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