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Passivated drainage sand with coating for ladle refining and preparation method thereof

A ladle refining and draining sand technology, which is applied in the manufacture of tools, casting equipment, metal processing equipment, etc., can solve the problems that carbon powder and drainage sand particles cannot form effective bonding, fine powder impurities are difficult to clean, and the production cost increases. , to achieve the effects of easy industrialization, reduced dissolution and oxidation, and simple preparation methods

Inactive Publication Date: 2012-09-12
沈阳东大净宇环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the ladle refining drainage sand used in China is chrome drainage sand. Some steel types adopt LF / VD process, and the refining time and storage time are as long as 180-240min or even longer; It has a low melting point with the surface of quartz sand, and it is difficult to clean the fine powder impurities. In addition, the dry carbon powder cannot form an effective bond with the surface of the drainage sand particles. When the powder falls, segregation is formed due to serious drifting, and the sintered layer is too thick after heating. When the sintered strength and the friction force between the sintered layer and the inner wall of the nozzle are greater than the static pressure of the molten steel, it is bound to burn oxygen or even stop pouring, and more seriously, it may cause pouring. At the same time, due to the use of a high proportion of chromium ore, serious hexavalent chromium pollution is formed, which increases the cost of preparation, and is also limited by the scarce resources of this material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Among the aggregates used, chromite sand accounts for 50% of the total weight of the aggregate, and silica sand accounts for 50% of the total weight of the aggregate;

[0024] The wetting agent adopted is an active agent aqueous solution with a weight concentration of 3%;

[0025] The refractory material that adopts is made up of colorant, lubricant, filler and antioxidant, and its weight ratio is colorant: lubricant: filler: antioxidant=1: 2: 2: 4.5; Described colorant is carbon black powder; the filler is electrode powder; the lubricant is flake graphite powder; the antioxidant is silicon carbide powder;

[0026] The passivation solution used is methyl silicone oil;

[0027] The preparation method is as follows: mix chromite sand and silica sand according to the above ratio to make aggregate and stir evenly, then use an atomizer to spray the infiltrating agent into the aggregate, stir evenly, and then add the coloring agent in the refractory powder, Lubricants, fill...

Embodiment 2

[0032] Among the aggregates used, chromite sand accounts for 30% of the total weight of the aggregate, and silica sand accounts for 70% of the total weight of the aggregate;

[0033] The wetting agent adopted is an active agent aqueous solution with a weight concentration of 4%;

[0034] The refractory material that adopts is made up of colorant, lubricant, filler and antioxidant, and its weight ratio is colorant: lubricant: filler: antioxidant=1: 1.5: 2.5: 4; Described colorant is ink powder ; The filler is graphite powder; the lubricant is spherical graphite powder; the antioxidant is titanium carbide powder;

[0035] The passivation solution used is ethyl silicone oil;

[0036] The preparation method is as follows: mix chromite sand and silica sand according to the above ratio to make aggregate and stir evenly, then use an atomizer to spray the infiltrating agent into the aggregate, stir evenly, and then add the coloring agent in the refractory powder, Lubricants, fillers...

Embodiment 3

[0041] Among the aggregates used, chromite sand accounts for 70% of the total weight of the aggregate, and silica sand accounts for 30% of the total weight of the aggregate;

[0042] The wetting agent adopted is an aqueous solution of active agent with a concentration of 5% by weight;

[0043] The refractory material that adopts is made up of colorant, lubricant, filler and antioxidant, and its weight ratio is colorant: lubricant: filler: antioxidant=1: 2: 2: 5; Described colorant is carbon black powder; the filler is electrode powder; the lubricant is flake graphite powder; the antioxidant is zirconium carbide powder;

[0044] The passivation solution used is methyl silicone oil;

[0045] The preparation method is as follows: mix chromite sand and silica sand according to the above ratio to make aggregate and stir evenly, then use an atomizer to spray the sizing agent into the aggregate, stir evenly, and then add the coloring agent in the refractory powder, Lubricants, filler...

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Abstract

The invention relates to passivated drainage sand with a coating for ladle refining and a preparation method thereof. The drainage sand comprises an aggregate composed of chromite sand and silica sand; the surface of the aggregate is coated with an impregnating compound; refractory powder is adhered to the surface of the impregnating compound, and passivation solution is coated outside the refractory powder. The preparation method comprises the following steps: uniformly agitating the aggregate prepared by mixing the chromite sand with the silica sand; then spraying the impregnating compound into the aggregate by adopting an atomizer, uniformly agitating, adding a refractory material and uniformly agitating; and finally spraying the passivation solution by adopting the atomizer and uniformly agitating. Through the drainage sand, the aggregate can be ensured to be better bonded with the refractory powder under the action of the impregnating compound, and the segregation of the refractory material can not occur during the use, so that an excessively-thick sintering layer is prevented from being formed due to long refining time; and the preparation method is simple, and the industrialization is easily realized.

Description

technical field [0001] The invention relates to a method for preparing drainage sand for ladle refining, in particular to a coated and passivated drainage sand for ladle refining and a preparation method thereof. Background technique [0002] Drainage sand is used to fill the nozzle at the injection hole at the bottom of the ladle. It is an indispensable refractory material for ladle refining. Before tapping the steel, the drainage sand is filled in the nozzle with the catheter method, which is in the shape of a steamed bun, generally higher than the outlet seat. The upper plane of the brick is 80-130mm, and then the ladle is placed under the tapping hole to avoid the steel flow directly impacting the steamed bun-shaped drainage sand on the upper part of the nozzle. For the use of drainage sand, it should generally have better high temperature sintering performance, that is, it can quickly form a crust after contact with molten steel to form a shell that blocks the downstrea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/42C04B35/14C04B35/628B22D41/44
Inventor 吴树全孙中强刘忠民
Owner 沈阳东大净宇环保科技有限公司
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