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A kind of thermal insulation covering agent for riser and preparation method thereof

A thermal insulation covering agent and a covering agent technology are applied in the field of foundry industry, which can solve the problems of affecting the thermal insulation effect and rapid exothermic process, and achieve the effects of increasing thermal insulation effect, simple preparation and convenient use.

Active Publication Date: 2016-07-06
WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The covering agent has good heat release ability, but the heat release process is fast, which affects the overall thermal insulation effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this embodiment, a thermal insulation covering agent for a riser is made of the following raw materials in parts by weight: 24 parts of expanded perlite, 6 parts of rice husk, 2 parts of magnesium powder, 6 parts of silicon powder, aluminum silicate fiber 28 parts, 11 parts of calcium oxide, 17 parts of graphite powder, 5 parts of sodium carboxymethylcellulose and 6 parts of soda; the raw materials are all passed through 200 sieves.

[0018] Wherein, the expansion factor of the expanded perlite is 16, and its silicon dioxide content is 75%. The graphite powder is acidified graphite powder, which is obtained through the following steps: reacting concentrated sulfuric acid, graphite and potassium permanganate with a weight ratio of 4:1:0.05 for 20 minutes, washing with water, drying and crushing to obtain acidified graphite pink.

[0019] The preparation method of the thermal insulation covering agent for a riser is to place all the raw materials passing through a 200...

Embodiment 2

[0022] In this embodiment, a thermal insulation covering agent for a riser is made of the following raw materials in parts by weight: 16 parts of expanded perlite, 9 parts of rice husk, 4 parts of magnesium powder, 12 parts of silicon powder, aluminum silicate fiber 21 parts, 15 parts of calcium oxide, 14 parts of graphite powder, 8 parts of sodium carboxymethylcellulose and 3 parts of soda; the raw materials are all passed through 200 sieves.

[0023] Wherein, the expansion factor of the expanded perlite is 12, and its silica content is 72%. The thermal insulation covering agent for a riser, the graphite powder is an acidified graphite powder obtained through the following steps: reacting concentrated sulfuric acid, graphite and potassium permanganate with a weight ratio of 4:1:0.05 for 30min, After washing with water, drying and crushing, acidified graphite powder can be obtained.

[0024] The preparation method of the thermal insulation covering agent for a riser is to pla...

Embodiment 3

[0027] In this embodiment, a thermal insulation covering agent for a riser is made of the following raw materials in parts by weight: 22 parts of expanded perlite, 7 parts of rice husk, 3 parts of magnesium powder, 9 parts of silicon powder, aluminum silicate fiber 24 parts, 13 parts of calcium oxide, 15 parts of graphite powder, 7 parts of sodium carboxymethylcellulose and 4 parts of soda; the raw materials are all passed through 200 sieves.

[0028] Wherein, the expansion multiple of the expanded perlite is 14, and its silica content is 74%. The graphite powder is acidified graphite powder, which is obtained through the following steps: reacting concentrated sulfuric acid, graphite and potassium permanganate with a weight ratio of 4:1:0.05 for 20 minutes, washing with water, drying and crushing to obtain acidified graphite pink.

[0029] The preparation method of the thermal insulation covering agent for a riser is to place all the raw materials passing through a 200-mesh s...

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PUM

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Abstract

The invention discloses a heat-insulation covering agent and a preparation method thereof for a riser. The heat-insulation covering agent comprises, by weight, 16-24 parts of expanded perlite, 6-9 parts of rice husk, 2-4 parts of magnesium powder, 6-12 parts of silica powder, 21-28 parts of aluminum silicate fiber, 11-15 parts of calcium oxide, 14-17 parts of graphite powder, 5-8 parts of sodium carboxymethyl cellulose and 3-6 parts of soda, wherein all the materials are screened by a 200-mesh screen. The heat-insulation covering agent is simple to prepare and convenient to use, is capable of insulating heat well when added from the riser and reacted with the magnesium powder and the silica powder, and has the function of absorbing impurities. Through detection, the viscosity of the covering agent is at 0.5-1.5Pa*s, the expansion times is 1.1-1.3, and the melting time is 10-15 seconds at the temperature of 1500 DEG C; the covering agent can form a heat insulation layer after fed into the riser with reasonable expansion times and melting time, and heat insulation effect is improved.

Description

technical field [0001] The invention relates to a thermal insulation covering agent for a riser and a preparation method thereof, belonging to the technical field of foundry industry. Background technique [0002] In foundry production, in order to prolong the solidification time of the molten metal in the riser, the covering material covered on the surface of the molten metal in the riser is called a covering agent. Put the riser covering agent in the riser so that it can cover the riser molten steel [0003] Prolong the encrustation time at the top of the riser, so that the molten steel in the riser is under the action of atmospheric pressure for a long time, which greatly improves the feeding efficiency of the riser, is conducive to the floating of gas and inclusions in the casting, and achieves the purpose of purifying the molten steel. And get sound steel parts, reduce the scrap rate. [0004] The patent application document "A thermal insulation covering agent" with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D1/00B22D11/111
CPCB22D1/00B22D11/111
Inventor 浦巧生
Owner WUJIANG HYDRAULIC COMPONENTS FOUNDRY