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Preparation method of refined chromite-based stuffing sand

A technology for draining sand and chrome, applied in the field of iron and steel smelting, can solve the problems of low self-opening rate, and achieve the effects of high self-opening rate, short time consumption and suitable cost

Active Publication Date: 2014-11-19
MAANSHAN NINGSHENG REFRACTORIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem of low self-opening rate of chromium drainage sand for ladles 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, uniform particle size distribution, and good fluidity Preparation method of chrome drainage sand for ladle with small thermal expansion rate, suitable cost and high self-opening rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of refined chrome drainage sand, comprising the following steps:

[0024] Step 1: Mix 60kg of chrome ore and 33kg of quartz sand in the mixing equipment for 3-5 minutes, then add 4kg of potassium feldspar and stir for 12-15 minutes, then add 2kg of low-grade silicon carbide and stir for 10-15 minutes, then add 1kg of carbon black was stirred for 10-15 minutes to obtain a chrome drainage sand mixture;

[0025] Step 2: put the chrome drainage sand mixture in step 1 into a rotary drying oven and bake at a temperature of 170°C-200°C for 25-30 minutes, and sieve to obtain a particle size of 0.15-1.5mm Chrome drainage sand products.

[0026] The chromium drainage sand for ladle prepared in this embodiment has 1122 furnaces counted; 1074 furnaces started pouring; the molten steel transfer time is more than 2 hours; the automatic pouring rate is 95.7%.

Embodiment 2

[0028] A preparation method of refined chrome drainage sand, comprising the following steps:

[0029] Step 1: Mix 65kg of chrome ore and 25kg of quartz sand in the mixing equipment for 3-5 minutes, then add 7kg of potassium feldspar and stir for 12-15 minutes, then add 2kg of low-grade silicon carbide and stir for 10-15 minutes, then add 1kg of carbon black was stirred for 10-15 minutes to obtain a chrome drainage sand mixture;

[0030] Step 2: put the chrome drainage sand mixture in step 1 into a rotary drying oven and bake at a temperature of 170°C-200°C for 25-30 minutes, and sieve to obtain a particle size of 0.15-1.5mm Chrome drainage sand products.

[0031] The chromium drainage sand for ladle prepared in this embodiment has 978 furnaces counted; 942 furnaces started pouring; the molten steel transfer time is more than 2 hours; the automatic pouring rate is 96.3%.

Embodiment 3

[0033] A preparation method of refined chrome drainage sand, comprising the following steps:

[0034] Step 1: Mix 63kg chrome sand and 27kg quartz sand in the mixing equipment for 3-5 minutes, then add 5kg potassium feldspar and stir for 12-15 minutes, then add 3kg of low-grade silicon carbide and stir for 10-15 minutes, then add 2kg Stir the carbon black for 10-15 minutes to obtain a chrome drainage sand mixture;

[0035] Step 2: put the chrome drainage sand mixture in step 1 into a rotary drying oven and bake at a temperature of 170°C-200°C for 25-30 minutes, and sieve to obtain a particle size of 0.15-1.5mm Chrome drainage sand products.

[0036] The chromium drainage sand for ladle prepared in this embodiment has a statistical number of 1034 furnaces; the number of pouring furnaces is 1004; the molten steel transfer time is ≥ 2 hours; the automatic pouring rate is 97.1%.

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Abstract

The invention discloses a preparation method of refined chromite-based stuffing sand and belongs to the technical field of iron and steel smelting. The method comprises the steps that 60-65 wt% of chromium ore and 25-33 wt% of quartz sand are blended for 3-5 minutes in a mixing device, 4-7 wt% of potash feldspar is added and blended for 12-15 minutes, 2-3 wt% of low-grade silicon carbide is added and blended for 10-15 minutes, 1-2 wt% of carbon black is added and blended for 10-15 minutes, and then a chromite-based stuffing sand mixture is obtained; the mixture is placed into a rotary drying furnace for baking, the baking temperature ranges from 170 DEG C to 200 DEG C, the baking time ranges from 25 minutes to 30 minutes, the mixture is sieved, and then the chromite-based stuffing sand with the particle size ranging from 0.15 mm to 1.5 mm is obtained. The chromite-based stuffing sand has the advantages of being good in high-temperature sintering performance, good in erosion resistance to molten steel and molten slag, uniform in particle size distribution, good in fluidity, low in thermal expansivity and high in automatic casting ratio.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a preparation method of chrome drainage sand for ladles. Background technique [0002] With the development and wide application of continuous casting technology, the ladle has replaced the original ceramic stopper rod with sliding nozzle and drainage sand. When the sliding nozzle is opened, under the guidance of the drainage sand, the molten steel in the ladle flows out automatically through the upper nozzle, the upper sliding hole, the lower sliding hole and the lower nozzle, and flows into the tundish through the long nozzle to realize continuous steel casting . With the continuous improvement of people's requirements for the quality of molten steel, automatic pouring of ladles has attracted much attention. If the pouring cannot be started automatically, the method of boiling the oxygen lance to assist the drainage will be used, which will cause a considerabl...

Claims

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Application Information

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IPC IPC(8): B22D41/44
Inventor 王福生
Owner MAANSHAN NINGSHENG REFRACTORIES
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