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

A technology of drainage sand and chrome, applied in the field of drainage sand, can solve the problems of high cost and high price of zircon, and achieve the effects of suitable cost, uniform particle size distribution, and uniform sintering layer.

Inactive Publication Date: 2013-03-06
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 chromium drainage sand for ladle and a preparation method thereof: first add 50 to 55 wt% of chromium ore sand and 35 to 40 wt% of quartz sand into a mixer, and stir for 2 to 3 minutes; then add 5 to 10 wt% of potassium feldspar Add to the mixer and stir for 5-10 minutes; then add 1 to 2wt% of flake graphite into the mixer and stir for 10-15 minutes; finally, pour out the four uniformly stirred materials from the mixer, at 180-220 Bake at ℃ for 30-40min to obtain chromium drainage sand for ladle.

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

Embodiment 2

[0020] A chromium drainage sand for ladle and its preparation method: firstly add 55-60wt% of chromium ore sand and 30-35wt% of quartz sand into a mixer, stir for 2 to 3 minutes; then add 5-10wt% of potassium feldspar Add to the mixer and stir for 5-10 minutes; then add 1 to 2wt% of flake graphite into the mixer and stir for 10-15 minutes; finally, pour out the four uniformly stirred materials from the mixer, at 180-220 Bake at ℃ for 30-40min to obtain chromium drainage sand for ladle.

[0021] The chromium drainage sand for ladle prepared in this embodiment has a statistical furnace number of 1089 furnaces; a casting furnace number of 1085 furnaces; a molten steel delivery time ≥ 2 hours; an automatic casting rate of 99.6%.

Embodiment 3

[0023] A kind of chromium drainage sand for ladle and its preparation method: first add 60~65wt% of chromium ore sand and 25~30wt% of quartz sand into a mixer, stir for 2~3 minutes; then add 5~10wt% of potassium feldspar Add to the mixer and stir for 5-10 minutes; then add 1 to 2wt% of flake graphite into the mixer and stir for 10-15 minutes; finally, pour out the four uniformly stirred materials from the mixer, at 180-220 Bake at ℃ for 30-40min to obtain chromium drainage sand for ladle.

[0024] The chromium drainage sand for ladle prepared in this embodiment has a statistical furnace number of 1021 furnaces; a casting furnace number of 1018 furnaces; a molten steel transfer shelf time ≥ 2 hours; an automatic casting rate of 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 the stirrer, 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 chromium drainage sand for ladle and a preparation method thereof. Background technique [0002] With the development of the world economy and the progress of science and technology, all sectors of society have put forward higher requirements for the quality of steel. The "fine steel concept" in iron and steel enterprises is continuously deepening. While increasing steel output, large domestic steel mills are paying more attention to the production of high-quality steel. [0003] The development of continuous casting and out-of-furnace refining has improved the production efficiency, but at the same time the tapping temperature has become higher and the molten steel transmission time has become longer. The traditional stopper system has been difficult to meet the requirements, and replaced by ladle Nozzle system. [0004] If the refining ladle cannot be poured automa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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