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Cold pressing pellet for insulating molten iron

A technology of cold-pressing pellets and molten iron, which is applied in the field of thermal insulation materials, can solve the problems of poor thermal insulation performance, high price, restrictions, etc., achieve good foaming performance and thermal insulation effect, and overcome the effect of large dust.

Inactive Publication Date: 2014-12-24
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

Also because of the high price of wollastonite, bauxite, iron concentrate, and coke powder, the poor thermal insulation performance is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of pellet for molten iron insulation, its component and parts by weight are: semi-fired dolomite with particle size ≤ 3 mm: 60 parts, raw vermiculite powder with particle size ≤ 0.088 mm: 20 parts, feldspar powder with particle size ≤ 0.088 mm: 10 Parts, clay with particle size ≤0.074 mm: 5 parts, coal gangue powder with particle size ≤0.088 mm: 5 parts.

[0019] Add an appropriate amount of water to moisten and cold-press into balls, and after drying, the crushing strength is 710N.

Embodiment 2

[0021] A pellet for hot metal heat preservation, its components and parts by weight are: half-fired dolomite with particle size ≤ 3 mm: 65 parts, raw vermiculite powder with particle size ≤ 0.088 mm: 10 parts, feldspar powder with particle size ≤ 0.088 mm: 8 Parts, clay with particle size≤0.074 mm: 8 parts, coal gangue powder with particle size≤0.088 mm: 9 parts.

[0022] Add an appropriate amount of water to moisten and cold-press into balls, and after drying, the crushing strength is 836N.

Embodiment 3

[0024] A kind of pellet for molten iron insulation, its component and parts by weight are: semi-fired dolomite with particle size ≤ 3 mm: 80 parts, raw vermiculite powder with particle size ≤ 0.088 mm: 5 parts, feldspar powder with particle size ≤ 0.088 mm: 4 parts Parts, clay with particle size≤0.074 mm: 8 parts, coal gangue powder with particle size≤0.088 mm: 3 parts.

[0025] Add an appropriate amount of water to moisten and cold-press into balls, and after drying, the crushing strength is 650N.

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PUM

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Abstract

The invention relates to a cold pressing pellet for insulating molten iron. The pellet comprises the components in parts by weight: 60-80 parts of half-calcined dolomite, 5-30 parts of crude vermiculite powder, 0.5-10 parts of feldspar powder, 3-8 parts of clay and 1-10 parts of coal gangue powder. The pellet provided by the invention is cold-pressed to be pelleted by using the half-calcined dolomite as a raw material, so that not only is the problem that a conventional heat preserver is dusty and great in use level and has pollution to the environment solved, but also the pellet has a certain desulfuration effect as well as favorable foaming performance and insulating effect. The pellet is suitable for insulating ladles or molten iron in torpedo ladles.

Description

technical field [0001] The invention relates to a thermal insulation material, in particular to a cold-pressed pellet for molten iron thermal insulation. Background technique [0002] After the blast furnace was enlarged, the volume of ladles and torpedo tanks carrying molten iron also increased. However, there are problems of temperature drop and heat loss during the transportation of molten iron, which lead to an increase in the cost of steel, which is not conducive to energy saving and consumption reduction. [0003] The function of the molten iron thermal insulation covering agent is to use the porous coating formed on the surface of the molten iron to play the role of thermal insulation. At present, there are many kinds of thermal insulation covering agents for hot metal in China, such as straw ash, perlite, carbonized rice husk, vermiculite and so on. The main raw materials used in the traditional thermal insulation covering agent have defects in thermal insulation, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00B22D11/111
Inventor 徐国涛
Owner 武汉钢铁有限公司
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