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Energy-saving slag thermal insulator

A technology of heat preservation agent and slag, which is applied in the field of energy-saving heat preservation agent, and can solve the problem of no recycling and utilization of heat energy.

Inactive Publication Date: 2010-11-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, these high-temperature slags are mainly used as building materials after cooling, but the heat energy contained in them has not been recycled.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment one: carbonized rice husk is used as energy-saving heat preservation agent, and its composition is 39.8% SiO 2 , 3.9% Al 2 o 3 , 2.5% CaO, 2.2% MgO, 9.2% Fe 2 o 3 , 1.6% R 2 O (R is a monovalent metal ion), 40.0% fixed carbon, 0.7% other components. When the energy-saving thermal insulation agent is applied to molten blast furnace slag, crusting on the surface of the molten blast furnace slag is reduced and fluidity is improved.

Embodiment 2

[0015] Example 2: Coke powder, carbonized rice husk and fluorite are prepared as an energy-saving and thermal insulation agent, which consists of 21.69% SiO 2 , 4.0% Al 2 o 3 , 5.7% CaO, 1.2% MgO, 2.6% F-, 5.2% Fe 2 o 3 , 0.8% R 2 O (R is a monovalent metal ion), 58.3% of fixed carbon, 0.2% of other components. When the energy-saving thermal insulation agent is applied to molten blast furnace slag, the crusting phenomenon on the surface of molten slag is reduced and the fluidity is improved.

Embodiment 3

[0016] Embodiment 3: Perlite, coke powder, fly ash and fluorite are prepared as energy-saving thermal insulation agent, and its composition is 36.3% SiO 2 , 18.0% Al 2 o 3 , 7.2% CaO, 0.7% MgO, 3.6% F - , 4.5% Fe 2 o 3 , 1.7% R 2 O (R is a monovalent metal ion), 11.6% of fixed carbon, 1.7% of other components. The energy-saving thermal insulation agent was added to the surface of high-temperature molten steel slag, and the results showed that the temperature of the molten slag added with thermal insulation agent was 1604°C during slag discharge, and the slag temperature was 1550°C during slag pouring, and the molten slag had good fluidity.

[0017] Under the same conditions, the temperature of the slag without heat preservation agent was 1623°C when it was discharged, and the temperature of the slag was 1480°C when it was poured, and the fluidity of the slag was poor.

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Abstract

The invention relates to an energy-saving slag thermal insulator, and belongs to the technical field of energy conservation, emission reduction and comprehensive utilization in the metallurgy industry. The thermal insulator comprises the following main chemical components in percentage by weight: 25 to 70 percent of SiO2, 1 to 25 percent of Al2O3, 1 to 40 percent of CaO, 0 to 20 percent of MgO, 0 to 10 percent of F<->, 0 to 10 percent of R2O (R is a monovalent metal ion), 0 to 10 percent of Fe2O3, 5 to 60 percent of fixed carbon with bulk density of 0.25 to 0.75g / cm<3>. The thermal insulator has high thermal insulation performance and can reduce the thermal loss of high-temperature slag; the thermal insulator contains a certain amount of fixed carbon, so heat generated in the chemical reaction of the fixed carbon can be used for further making up the thermal loss of the slag; meanwhile, the thermal insulator belongs to a silicon-aluminum material, and part or all of the thermal insulator can be dissolved in the slag finally so as to improve the chemical composition of the slag and reduce the melting point of the slag. The thermal insulator has the advantages of simple production process, low cost, and suitability for various processes for utilizing the sensible heat of the slag, increasing the fluidity of the slag or improving the performance of the slag.

Description

technical field [0001] The invention belongs to the technical field of energy saving, emission reduction and comprehensive utilization in the metallurgical industry, in particular to an energy-saving thermal insulation agent used in the process of utilizing molten slag. Background technique [0002] As we all know, the metallurgical industry is an industry with large imports and large exports, which generates a huge amount of solid waste, and high-temperature slag accounts for the highest proportion of solid waste. Therefore, how to efficiently use high-temperature slag has become a research hotspot in the metallurgical industry. The high-temperature slag in the metallurgical industry mainly includes various types of slag, steel slag, ferroalloy slag, non-ferrous metal smelting slag, smelting reduction slag and phosphorus slag. At present, these high-temperature slags are mainly used as building materials after cooling, but the heat energy contained in them has not been recy...

Claims

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Application Information

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IPC IPC(8): C21B3/06
CPCY02W30/50
Inventor 苍大强李宇杨志杰刘晓明张玲玲
Owner UNIV OF SCI & TECH BEIJING
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