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Method for preparing insulating foam glass ceramic material from lithium tailings

A technology of glass ceramics and tailings, which is applied in the field of preparing foam insulation glass ceramic materials, which can solve the problems of soil water and air pollution, increase of enterprise management costs, waste of resources and resources, etc., achieve good results, low production costs, and overcome flammability Effect

Inactive Publication Date: 2018-06-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The discharge of a large amount of lithium slag and the simple long-term stacking or landfill treatment not only greatly increase the management cost of the enterprise, but also cause a huge waste of resources and environmental pollution
Tailings often contain heavy metal elements such as lead, cadmium, chromium, metalloid arsenic, nickel and tin, which can easily penetrate into soil and groundwater resources, causing secondary pollution, and may even cause damage to local vegetation, soil water and air pollution. And become a hidden danger of secondary geological disasters and safety
[0003] Spodumene flotation concentrate and solid waste from lithium salt production have some potential pozzolanic activity, but the activity is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The lithium tailings and the cleaned waste cullet are wet ball milled and dried respectively, and passed through a 120-120 mesh sieve;

[0026] (2) Main material and fluxing material by chemical percentage: SiO 2 55%, Al 2 o 3 15%, CaO3%, Na 2 O 9%, K 2 O5%, NaF 13% mixed ingredients; at the same time add 8% calcium carbonate, 2% silicon carbide foaming agent;

[0027] (3) Put the uniformly mixed powder into a refractory container and rapidly heat up to 800°C at a rate of 5°C / min; then slowly heat up to 1050°C at a rate of 5°C / min for melting and foaming; and then keep warm for 15 minutes;

[0028] (4) Rapid cooling to 500° C. for annealing treatment for 1 hour, slow cooling, demoulding and cutting to obtain the desired product.

[0029] (5) The foam glass ceramic material is gray, with uniform distribution of pores, the pore diameter is between 1 and 1.5mm, the thermal conductivity is 0.23W / (m K), the compressive strength can reach 5.0MPa, and the bulk densi...

Embodiment 2

[0031] (1) The lithium tailings and the cleaned waste cullet are wet ball milled and dried respectively, and passed through a 120-120 mesh sieve;

[0032] (2) Main material and fluxing material by chemical percentage: SiO 2 64%, Al 2 o 3 12%, CaO5%, MgO1.0%, K 2 O5%, Na 2 O 9%, NaF4% mixed ingredients; at the same time add 7% calcium carbonate, 3% silicon carbide foaming agent;

[0033] (3) Put the uniformly mixed powder into a refractory container and rapidly heat up to 800°C at a rate of 8°C / min; then slowly heat up to 900°C at a rate of 5°C / min for melting and foaming; and keep warm for 15 minutes;

[0034] (4) Rapid cooling to 600° C. for 2 hours, annealing treatment, slow cooling, demoulding and cutting to obtain the desired product.

[0035] (5) The foam glass ceramic material is gray, with uniform distribution of pores, the pore diameter is between 0.7 and 1.0mm, the thermal conductivity is 0.29W / (m K), the compressive strength can reach 5.8MPa, and the bulk densit...

Embodiment 3

[0037] (1) The lithium tailings and the cleaned waste cullet are wet ball milled and dried respectively, and passed through a 120-120 mesh sieve;

[0038] (2) Main material and fluxing material by chemical percentage: SiO 2 65%, Al 2 o 3 10%, CaO 2%, MgO 2.0%, Na 2 O 9%, K 2 O 2%, NaF10% mixed ingredients; at the same time add 4% calcium carbonate, 3% silicon carbide foaming agent;

[0039] (3) Put the uniformly mixed powder into a refractory container and rapidly heat up to 800°C at a rate of 10°C / min; then slowly heat up to 950°C at a rate of 5°C / min for melting and foaming; and keep warm for 15 minutes;

[0040] (4) Rapid cooling to 600° C. for 2 hours, annealing treatment, slow cooling, demoulding and cutting to obtain the desired product.

[0041] (5) The foam glass ceramic material is gray, with uniform distribution of pores, the pore diameter is between 0.9 and 1.5mm, the thermal conductivity is 0.29W / (m K), the compressive strength can reach 5.1MPa, and the bulk...

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Abstract

The invention provides a method for preparing an insulating foam glass ceramic material from lithium tailings. The method comprises the following steps: 1, the lithium tailings and cleaned cullet aresubjected to wet ball milling, dried and sieved by a 120-200-mesh sieve respectively; 2, the lithium tailings, the cullet, sodium fluoride, potassium carbonate and mirabilite are uniformly mixed in percentage by mass to serve as a base material; 3, a foaming agent is added to the base material, and a mixture is obtained; 4, uniformly mixed powder is placed into a refractory container, heated rapidly to 800 DEG C, then heated to 900-1050 DEG C at reduced rate for melting foaming, and subjected to heat preservation for 15 min; 5, after heat preservation, quenching is performed to 500-600 DEG C for annealing treatment for 1 h, slow cooling is performed, and a product is obtained after demolding and cutting. Through adoption of the method, the environmental problem in the slag treatment process is solved, production cost of the product is reduced, the product with high added value is prepared, and compared with other products, the product has high strength and good insulating performance.

Description

technical field [0001] The invention relates to the field of preparing glass ceramics from solid wastes such as lithium industrial tailings and tailings, and discarded cullet, and in particular to a method for preparing foam insulation glass ceramic materials by using lithium tailings. Background technique [0002] my country is rich in lithium resources, and the proven reserves rank among the top in the world. However, extensive resource development and backward mining, washing, smelting and waste residue treatment technologies make a large amount of heavy metal-containing slag materials be regarded as waste products, regardless of the choice of spodumene concentrate. Or the preparation of lithium salts will cause a large amount of lithium slag or lithium tailings. The discharge of a large amount of lithium slag and the simple long-term stacking or landfill treatment not only greatly increase the management cost of the enterprise, but also cause a huge waste of resources and...

Claims

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Application Information

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IPC IPC(8): C03C6/02C03C11/00C03B19/08
CPCC03C1/002C03B19/08C03C11/007
Inventor 张宏泉文进童慧夏正辉王亚名孙昌志方清明
Owner WUHAN UNIV OF TECH
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