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Chromium-containing diversion sands for steel ladle and preparation method thereof

A technology of drainage sand and chromium, which is applied in the field of drainage sand, can solve the problems of high cost and high price of zircon, and achieve the effect of reasonable cost, uniform particle size distribution and good fluidity

Inactive Publication Date: 2011-07-06
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the price of zircon is very high, and the cost of using zircon drainage sand made of zircon as raw material is very expensive, which limits the use of zircon drainage sand in steel mills

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A chrome drainage sand for ladle and its preparation method: first add 50-55wt% chromium ore sand and 35-40wt% quartz sand into a mixer, and stir for 2-3 minutes; then add 5-10wt% potassium feldspar Add it into the mixer and stir for 5-10 minutes; then add 1-2wt% flake graphite into the mixer and stir for 10-15 minutes; Bake at ℃ for 30-40 minutes to obtain chrome drainage sand for ladle.

[0018] The chromium drainage sand for ladle prepared in this embodiment has a statistical number of 942 furnaces; a number of 938 furnaces for pouring; the molten steel transfer time is ≥ 2 hours; and the automatic pouring rate is 99.6%.

Embodiment 2

[0020] A chrome drainage sand for ladle and its preparation method: first add 55-60wt% chromium ore sand and 30-35wt% quartz sand into a mixer, and stir for 2-3 minutes; then add 5-10wt% potassium feldspar Add it into the mixer and stir for 5-10 minutes; then add 1-2wt% flake graphite into the mixer and stir for 10-15 minutes; Bake at ℃ for 30-40 minutes to obtain chrome drainage sand for ladle.

[0021] The chromium drainage sand for ladle prepared in this embodiment has 1089 furnaces counted; 1085 furnaces started pouring; the molten steel transfer time is more than 2 hours; the automatic pouring rate is 99.6%.

Embodiment 3

[0023] A chrome drainage sand for ladle and its preparation method: first add 60-65wt% chrome sand and 25-30wt% quartz sand into a mixer, and stir for 2-3 minutes; then add 5-10wt% potassium feldspar Add it into the mixer and stir for 5-10 minutes; then add 1-2wt% flake graphite into the mixer and stir for 10-15 minutes; Bake at ℃ for 30-40 minutes to obtain chrome drainage sand for ladle.

[0024] The chromium drainage sand for ladle prepared in this embodiment has 1021 furnaces counted; 1018 furnaces started pouring; the molten steel transfer time is more than 2 hours; the automatic pouring rate is 99.7%.

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Abstract

The invention relates to chromium-containing diversion sands for a steel ladle and a preparation method thereof. The preparation method adopts the technical scheme that chromium ore of 50 to 70 percent (by weight percent) and quartz sands of 20 to 40 percent are added to a stirrer at first, and the stirring is carried out for 2 to 3 minutes; then potash feldspar of 5 to 10 percent is added to thestirrer, and the stirring is carried out for 5 to 10 minutes; flake graphite of 1 to 2 percent is added to the stirrer, and the stirring is carried out for 10 to 15 minutes; and finally, the four types of materials that are stirred uniformly are poured out from the stirrer, and are baked for 30 to 40 minutes under the temperature ranging from 180 to 220 DEG C, so as to obtain the chromium-containing diversion sands for the steel ladle. The prepared chromium-containing diversion sands for the steel ladle are characterized in that the refractoriness is high, the high-temperature sintering property is good, molten steel erosion resistance and molten slag erosion resistance are good, the particle size distribution of granules is uniform, the flowability is good, the heat expansion rate is lower, the cost is appropriate, and the automatic-opening ratio is high.

Description

technical field [0001] The invention belongs to the technical field of drainage sand, and in particular relates to a chrome drainage sand for a ladle and a preparation method thereof. Background technique [0002] With the development of the world economy and the advancement of science and technology, various fields of society have put forward higher requirements for the quality of steel products. The "high-quality steel concept" in iron and steel enterprises has been continuously deepened. While increasing steel production, domestic large-scale steel mills have paid more attention to the production of high-standard varieties of steel. [0003] The development of continuous casting and refining outside the furnace has improved production efficiency, but at the same time, the tapping temperature has become higher, and the molten steel transfer time has become longer. The traditional stopper rod system has been difficult to meet the requirements, and the ladle is replaced. No...

Claims

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Application Information

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IPC IPC(8): B22D41/44
Inventor 赵惠忠刘锋余俊张寒陶博袁聪
Owner WUHAN UNIV OF SCI & TECH
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