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Chrome drainage sand for special steel and preparation technology thereof

A technology for draining sand and special steel, applied in manufacturing tools, foundry equipment, metal processing equipment, etc., can solve problems such as threats to employee safety production, production losses, and disrupted production rhythms.

Inactive Publication Date: 2011-02-16
上海盛江特种耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the general chrome drainage sand is used, its self-opening rate is only about 61%. If the self-opening rate is too low, it will disrupt the normal production rhythm, cause production loss, and seriously threaten the safety of employees in production.

Method used

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  • Chrome drainage sand for special steel and preparation technology thereof
  • Chrome drainage sand for special steel and preparation technology thereof
  • Chrome drainage sand for special steel and preparation technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 preparation technology such as figure 1 As shown, the details are: ① Add 28KG quartz sand and 0.5KG phenolic resin to the mixing equipment, stir for 3 minutes until the quartz sand particles are completely wetted, add 1.5KG graphite powder, stir for 3 minutes until the graphite powder and quartz After the sand particles are mixed evenly, add 70KG chromite and stir for 3 minutes until uniform.

[0023] ②Put the mixed chrome drainage sand into the baking kiln and bake at a maximum temperature of 200°C for 18 hours.

[0024] ③Sieve the baked chrome drainage sand to remove false particles. The particle size physical ratio of the final product:

[0025] Particle size range (mm)

[0026] In this embodiment, the weight ratio between chromite and quartz sand is selected to be 2.5: 1, so that the product has suitable high-temperature performance, 1.5KG of graphite is added to make the product have suitable sintering performance, and 0.5KG of phenolic ald...

Embodiment 2

[0028] ①Add 33KG quartz sand and 1.5KG phenolic resin to the mixing equipment, stir for 5 minutes until the quartz sand particles are completely wetted, then add 1.25KG graphite powder, stir for 5 minutes until the graphite powder and quartz sand are evenly mixed, then add 64.25 KG of chromite, stir for 5 minutes until uniform.

[0029] ②Put the mixed chrome drainage sand into a baking kiln and bake at a maximum temperature of 200°C for 18 hours.

[0030] ③Sieve the baked chrome drainage sand to remove false particles. The particle size physical ratio of the final product:

[0031] Particle size range (mm)

[0032] In this embodiment, the weight ratio between chromite and quartz sand is selected to be 1.95: 1 so that the product has suitable high-temperature performance, and 1.25KG of graphite is added to make the product have suitable sintering performance, and 1.5KG of phenolic aldehyde is added resin bond. Due to the adoption of the technical solution of this e...

Embodiment 3

[0034] ①Add 31KG quartz sand particles and 1KG phenolic resin to the mixing equipment, stir for 4 minutes, add 1.1KG graphite powder after the quartz sand particles are completely wetted, stir for 4 minutes, and add 66.9 KG of chromite, stir for 4 minutes until uniform.

[0035] ②Put the mixed chrome drainage sand into a baking kiln and bake at a maximum temperature of 200°C for 18 hours.

[0036] ③Sieve the baked chrome drainage sand to remove false particles. The particle size physical ratio of the final product:

[0037] Particle size range (mm)

＞1

1-0.5

0.5-0.21

0.21-0.15

0.15-0.09

＜0.09

Mass percentage after sieving (%)

2.0

18

68

11.3

0.7

-

[0038] In this embodiment, the weight ratio between chromite and quartz sand is selected to be 2.16:1 so that the product has suitable high-temperature performance, 1.1KG of graphite is added to make the product have suitable sintering performance, a...

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Abstract

The invention relates to chrome drainage sand for special steel and a preparation technology thereof, belonging to the technical field of steel smelting. The chrome drainage sand for special steel comprises the following components in percentage by mass: 28-33 % of quartz sand as aggregate, 62-70 % of ferrochrome as a base material, 1-1.5 % of graphite powder as an additive and 0.5-1.5 % of phenolic resin as a bonding agent. The preparation technology comprises: 1) in mixing equipment, adding 28-33 % of quartz sand and 0.5-1.5 % of bonding agent phenolic resin, stirring, and adding 1-1.5 % of graphite powder and stirring after the quartz sand particles are completely wetted; after the graphite powder and the quartz sand particles are evenly mixed, adding 62-70 % of ferrochrome ore, and continuously stirring to obtain an even mixture; 2) adding the well mixed chrome drainage sand into a roasting kiln for roasting, wherein the highest roasting temperature is 200 DEG C, and the total roasting time is equal to 18 hours; and 3) removing fake particles in the chrome drainage sand, and screening the product particles to cause the product particles to have suitable bulk density. Aiming at the requirement of smelting special steel, the invention develops special chrome drainage sand and causes self opening rate of the chrome drainage sand to be above 90%.

Description

technical field [0001] The invention relates to drainage sand in the technical field of iron and steel smelting and a preparation process thereof. Background technique [0002] Chromium drainage sand is a granular filler that is added to the pouring hole at the bottom of the ladle before tapping. Its function is that after the molten steel in the ladle is refined, the ladle is hoisted to the pouring station to open the pouring hole at the bottom of the ladle, and the chrome drainage sand and molten steel can flow out of the pouring hole naturally under the action of gravity. In the process of iron and steel production, the steel ladle is an indispensable link as the equipment for the flow of molten steel and participates in the metallurgical process. Moreover, the self-opening of the steel ladle during the pouring process directly affects the product quality, production organization and consumption. . For smelting sulfur-containing steel and other special steel ladles that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/44
Inventor 薛娜卓龙妙王炜孙海宁谭平芳陆冬弟谭衍民庞建华周建宝
Owner 上海盛江特种耐火材料有限公司
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