Method for producing foamed glass by melting blast furnace slag

A technology of foamed glass and blast furnace slag, which is applied in the field of blast furnace slag recycling, can solve the problems of labor-consuming, high production cost, high energy consumption, etc., and achieve the effects of fine and uniform pores, reduced production cost, and large adsorption capacity

Inactive Publication Date: 2017-05-10
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of raw materials for foamed glass production is different, and the foaming time and temperature are not easy to control, which affects the quality of foamed glass
The traditional production process of foamed glass needs to be sintered with a mold box, manually demoulded, and cooled in an annealing kiln. The disadvantages of this process are: it consumes a lot of labor, the loss of the mold box is large, and the production efficiency is low, which leads to a substantial increase in the production cost of the product. Difficult to promote on a large scale
[0006] In the above method, basic raw materials such as blast furnace slag enter the process at normal temperature, and heating and melting are required during production, and the melting temperature reaches above 1000°C, so the energy consumption is high and the production cost is relatively high

Method used

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  • Method for producing foamed glass by melting blast furnace slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for producing foamed glass by melting blast furnace slag, comprising the steps of:

[0024] 1) Accurately weigh 70 parts of glass powder by mass, 0.1 part of foaming agent, 0.2 part of foam stabilizer, and 0.1 part of fluxing agent, and mix each component evenly to obtain the initial raw material of foamed glass;

[0025] 2) Take 29 parts of molten blast furnace slag from the blast furnace slag outlet in the heating furnace, spray it into the heating furnace and keep it for 8 minutes; then adjust the temperature in the heating furnace to 1000°C and keep it for 15 minutes; The sintered expanded foamed heating material is obtained through foaming and annealing in sequence;

[0026] 3) Take the sintered expanded foam heating material obtained in step 2) out of the heating furnace and cool it naturally to obtain a bulk density of 300kg / m 3 , Water absorption rate of 110%, foamed glass with a pore size of 25 μm.

[0027] In the above steps, the blast furnace slag ...

Embodiment 2

[0030] A method for producing foamed glass by melting blast furnace slag, comprising the steps of:

[0031] 1) Accurately weigh 29 parts of glass powder by mass, 3.9 parts of foaming agent, 0.3 part of foam stabilizer, and 0.8 part of fluxing agent, and mix each component evenly to obtain the initial raw material of foamed glass;

[0032] 2) Take 70 parts of molten blast furnace slag from the slag outlet of the blast furnace into the heating furnace, and spray the primary raw material of foamed glass obtained in step 1) into the heating furnace, keep it warm for 7 minutes; then adjust the temperature in the heating furnace to 950°C , keep warm for 20min; make the foamed glass raw material sequentially foamed and annealed in the heating furnace to obtain the sintered expanded foamed heating material;

[0033] 3) Take the sintered expanded foam heating material obtained in step 2) out of the heating furnace and cool it naturally to obtain a bulk density of 500kg / m 3 , Water abs...

Embodiment 3

[0037] A method for producing foamed glass by melting blast furnace slag, comprising the steps of:

[0038] 1) Accurately weigh 40 parts of glass powder by mass, 3.5 parts of foaming agent, 0.5 part of foam stabilizer, and 0.6 part of fluxing agent, and mix each component evenly to obtain the initial raw material of foamed glass;

[0039] 2) Take 59 parts of molten blast furnace slag from the blast furnace slag outlet in the heating furnace and spray the foamed glass raw material obtained in step 1) into the heating furnace and keep it warm for 10 minutes; then adjust the temperature in the heating furnace to 1000°C , keep warm for 12 minutes; make the foamed glass raw material sequentially foamed and annealed in the heating furnace to obtain a sintered expanded foamed heating material;

[0040] 3) Take the sintered expanded foam heating material obtained in step 2) out of the heating furnace and cool it naturally to obtain a bulk density of 800kg / m 3 , Water absorption rate ...

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Abstract

The invention discloses a method for producing foamed glass by melting blast furnace slag. The method comprises the following steps: using the blast furnace slag as a main raw material to produce the foamed glass, wherein the blast furnace slag is metallurgical furnace slag produced online in the ironmaking process of a blast furnace; after acquiring the blast furnace slag from a slag discharge opening of the blast furnace, directly mixing with other raw materials in a high-temperature molten state; finally preparing the foamed glass. The method uses melting blast furnace slag with a high content of glass body as the main raw material, makes full use of residual heat of the melting blast furnace slag and secondary resources, and achieves purposes of energy conservation and environmental friendliness.

Description

technical field [0001] The invention relates to a technology for recycling blast furnace slag, in particular to a method for producing foamed glass by melting blast furnace slag. Background technique [0002] During blast furnace smelting, 300-600kg of slag is generally produced per ton of pig iron smelted. Even for high-quality raw materials with an iron content of about 65%, the amount of slag can reach 185-250kg / t. In this way, the annual output of blast furnace slag in my country has reached million tons. At present, blast furnace slag is mainly used to produce mineral powder to replace cement. With the price of cement falling, the added value of blast furnace slag to produce slag has declined. Many scientific research institutes and enterprises are actively studying other ways of using blast furnace slag. [0003] Foam glass, also known as porous glass or foam glass, is a kind of heat-insulating glass with a porosity of more than 90% and composed of uniform pores. Foa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C11/00C03C6/10
CPCC03C11/007C03C1/002
Inventor 李灿华刘思李晖程勇倪俊焦立新江新卫
Owner 武汉钢铁有限公司
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