Chrome stuffing sand for refining ladles, and production method thereof

A technology of drainage sand and chromium, which is applied in the field of refractory materials, can solve the problems of drainage sand raw material dependence on imports, low thermal expansion rate, high refractoriness, etc., and achieve good fluidity, good high-temperature sintering performance, and good thermal shock resistance.

Active Publication Date: 2018-02-02
北京利尔高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned problems in the prior art, the present invention provides a method for manufacturing chrome drainage sand for refining ladles. The drainage sand produced by the method can solve the problems of dependence on imports of raw materials and high cost, and the product has high refractoriness and high temperature sintering. Good performance, good resistance to molten steel and slag erosion, uniform particle size distribution, good fluidity, small thermal expansion rate, high self-opening rate, low chromium and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of refined chrome chrome drainage sand, comprising the following steps:

[0020] Step 1: Weigh 10% chrome ore sand, 60% calcium aluminate titanate fused ball, 30% fracturing quartz sand, 0.1% carbon black, and 0.5% graphite according to the mass percentage, and add them to the stirring equipment in sequence, Stir for 15 minutes to obtain mixture A.

[0021] Step 2: put the mixture A in step 1 into a rotary drying oven and bake at a temperature of 110° C. for 0.5 hours, and sieve to obtain a chrome drainage sand product with a particle size of 0.5 mm.

[0022] The chromium drainage sand for ladle prepared in this embodiment has 990 furnaces counted; 979 furnaces started pouring; the automatic pouring rate is 98.9%.

Embodiment 2

[0024] A preparation method of refined chrome chrome drainage sand, comprising the following steps:

[0025] Step 1: Weigh 15% chrome ore sand, 50% calcium aluminate titanate fused ball, 35% fracturing quartz sand, 0.2% carbon black, and 0.6% graphite according to the mass percentage, and add them to the stirring equipment in sequence, Stir for 18 min to obtain mixture A.

[0026] Step 2: put the mixture A in step 1 into a rotary drying oven and bake at a temperature of 110°C to 150°C for 0.6h, and sieve to obtain a chrome drainage sand product with a particle size of 1.5mm.

[0027] The chromium drainage sand for ladle prepared in this embodiment has 1050 furnaces counted; 1041 furnaces started pouring; the automatic pouring rate is 99.1%.

Embodiment 3

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

[0030] Step 1: Weigh 20% chrome ore sand, 40% calcium aluminate titanate fused ball, 40% fracturing quartz sand, 0.3% carbon black, and 0.7% graphite according to mass percentage, and add them to the stirring equipment in sequence, Stir for 20 minutes to obtain mixture A.

[0031] Step 2: put the mixture A in step 1 into a rotary drying oven to bake at a temperature of 110°C to 150°C for 1 hour, and sieve to obtain a chrome drainage sand product with a particle size of 2mm.

[0032] The chromium drainage sand for ladle prepared in this embodiment has a count of 976 furnaces; 969 furnaces started pouring; the automatic pouring rate is 99.2%.

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Abstract

The invention provides a chrome stuffing sand for refining ladles, and a production method thereof. The problems of low automatic casting rate, high production cost and large environmental impact of stuffing sands are solved. The chrome stuffing sand for refining ladles comprises, by mass, 1-20% of chrome ores, 40-60% of calcium alumino-titanate electromelted balls, 30-40% of fractured quartz sands and 0.6-1% of a carbon additive, and the carbon additive is a carbon black and graphite mixture. The introduced calcium alumino-titanate which is industrial steelmaking waste slag is applied to thestuffing sand, so the waste slag is effectively recycled, and the manufacturing cost is greatly reduced. The calcium alumino-titanate electromelted balls are adopted to partially substitute the chromeores, so the pollution is reduced, molten steel is cleaned, and the problems of dependence on importance and high cost of raw materials are solved.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a chrome drainage sand for refining ladles and a preparation method thereof. Background technique [0002] In order to prevent the molten steel at the ladle nozzle from being frozen, the ladle nozzle should be filled with drainage sand. The mechanism of the drainage sand is: in the initial stage of molten steel injection into the ladle, the drainage sand on the upper surface of the nozzle is sintered rapidly after contacting the molten steel and hinders the penetration of the molten steel. The sintered layer can withstand the static pressure of the molten steel under the support of the lower drainage sand without damage ; At the same time, the sintering speed of the drainage sand slows down, and the sintering layer maintains a certain thickness. When pouring is started, the unsintered drainage sand in the lower part falls due to its own weight, and the sintered laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/105B22D41/44
CPCB22D41/44C04B35/105C04B35/66C04B2235/3418C04B2235/424C04B2235/425C04B2235/5427
Inventor 刘丽高梅王团收任林张盛赵伟车晓梅刘美荣曹仁锋王伟伟张晓波赵冉胡玲军
Owner 北京利尔高温材料股份有限公司
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