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Preparation method of siliceous stuffing sand

A technology of drainage sand and silica, which is applied in the field of drainage sand, can solve the problems of low self-opening rate and "bridging", and achieve the effects of slowing down the sintering speed, reducing contact and reducing strength

Inactive Publication Date: 2015-01-28
马鞍山市欣隆炉料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of low self-opening rate and prone to "bridging" phenomenon in the prior art, the present invention provides a kind of high refractoriness, good high-temperature sintering performance, good resistance to molten steel and slag erosion, Preparation method of siliceous drainage sand for steel ladle with uniform particle size distribution, good fluidity, low thermal expansion rate, reasonable cost, no "bridging" phenomenon and high self-opening rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of siliceous drainage sand, comprising the following steps:

[0022] Step 1, weigh 75kg of quartz sand, 5kg of potassium feldspar and 8kg of graphite powder, add them to the mixing equipment in turn, stir at high speed for 15 minutes, then add 12kg of regulator, stir at high speed for 8-12 minutes, then add 8kg of water , high-speed stirring and mixing evenly to obtain mixture A;

[0023] Step 2: put the mixture A in step 1 into a rotary drying oven and bake at a temperature of 170° C. for 2 hours to obtain a siliceous drainage sand product.

Embodiment 2

[0025] A preparation method of siliceous drainage sand, comprising the following steps:

[0026] Step 1: Weigh 95kg of quartz sand, 1kg of potassium feldspar and 1kg of graphite powder according to mass percentage, add them to the mixing equipment in turn, stir at high speed for 20 minutes, then add 3kg of regulator, stir at high speed for 8-12 minutes, then add 10kg of water was stirred evenly at high speed to obtain mixture A;

[0027] Step 2: put the mixture A in step 1 into a rotary drying oven and bake at a temperature of 200° C. for 1.5 hours to obtain a siliceous drainage sand product.

Embodiment 3

[0029] A preparation method of siliceous drainage sand, comprising the following steps:

[0030] Step 1: Weigh 85kg of quartz sand, 3kg of potassium feldspar and 4kg of graphite micropowder according to the mass percentage, add them to the mixing equipment in turn, stir at high speed for 20 minutes, then add 8kg of regulator, stir at high speed for 8-12 minutes, then add 9kg of water was mixed evenly with high-speed stirring to obtain mixture A;

[0031] Step 2: put the mixture A in step 1 into a rotary drying oven and bake at a temperature of 185° C. for 2 hours to obtain a siliceous drainage sand product.

[0032] In the present invention, quartz sand is used as the main raw material, and potassium feldspar is used as a low melting point sintering agent. At a lower temperature, potassium feldspar powder can quickly form a large amount of liquid phase in the drainage sand, which promotes the rapid sintering of the surface drainage sand and prevents The agitation of the molte...

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Abstract

The invention discloses a preparation method of siliceous stuffing sand, belonging to the field of stuffing sand. The preparation method comprises the following steps: step I, weighing the following components in percentage by mass: 75-95% of quartz sand, 1-5% of potassium feldspar and 1-8% of graphite micro powder, adding the components into stirring equipment in sequence to stir for 15-20 minutes at a high speed, and then adding 3-12% of a regulator to stir for 8-12 minutes at a high speed, and adding water which accounts for 8-10% of the total weight of the components to stir and mix uniformly at a high speed to obtain a mixture A; and step II, putting the mixture A in the step I in a rotary drying oven to roast for 1.5-2 hours at a roasting temperature of 170-200 DEG C to obtain the siliceous stuffing sand. The preparation method of the siliceous stuffing sand is simple, reasonable in component selection, easily available in raw material, good in high-temperature sintering performance, uniform in particle granularity distribution, good in mobility, relatively small in coefficient of thermal expansion and high in self-opening rate.

Description

technical field [0001] The invention relates to the field of drainage sand, in particular to a preparation method of siliceous drainage sand. Background technique [0002] Drainage sand is mainly used for blocking and drainage of the injection hole at the bottom of the ladle. It is an indispensable refractory material for the ladle. Before injecting molten steel into the ladle, first use the drainage sand to block the flow hole, and then pour the molten steel; When the bottom injection hole is opened, the drainage sand in the hole must be able to fall down automatically so that the molten steel can flow down. Generally, the self-opening rate is required to be over 90%. [0003] The mechanism of the drainage sand is that the upper surface of the drainage sand filled in the ladle nozzle produces a thinner sintered layer under the heat of molten steel to form a "shell". Once the slide plate is opened, most of the unsintered sand bodies in the nozzle will Falling freely, at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 谢德义
Owner 马鞍山市欣隆炉料有限责任公司
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