Deslagging agent for improving slagging and slagging efficiency in industrial silicon smelting and preparation method thereof

A technology of slagging agent and industrial silicon, which is applied in the field of slagging agent and its preparation to improve the efficiency of slagging and slagging in industrial silicon smelting, can solve the problems of heavy workload, large amount of slagging agent added, and high cost, and achieve a High speed, short reaction time, and improved yield

Pending Publication Date: 2022-02-15
云南永昌硅业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the amount of slag removal agent added before the silicon is produced in each furnace is large, the cost is high, and it needs to be added in three times, and the workload is heavy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The present invention also provides the preparation method of the slagging agent, the specific method is as follows: firstly crush the calcium oxide to a particle size ≤ 3mm for later use, then prepare NaOH and curing agent into 25-50% NaOH solution and 1.1-2.1% After mixing the curing agent solution, add it to the mixture of crushed calcium oxide, charcoal powder, petroleum coke powder and dry powder binder and mix evenly, then fully stir the material in the silo and enter the pressure ball under its own gravity After the system, it is cold-pressed into pellets and dried.

[0021] The size of the pellets is length: width: thickness=70-90mm:40-60mm:30-40mm, and the pressure of the ball pressing system is 10-15MPa.

[0022] The present invention also provides a method for smelting industrial silicon. According to the slagging period, the slagging agent is added to the triangular area of ​​the electric furnace and / or the bottom of the electrode 2 hours before the silicon ...

Embodiment 1

[0026] A preparation method of a slagging agent for improving the slagging efficiency of industrial silicon smelting. The specific steps are as follows: 500kg of calcium oxide is broken into particles with a particle size of 3mm, 250kg of charcoal powder, and 250kg of petroleum coke powder are mixed evenly, and 70kg of GY is added. Coal pellet dry powder binder, mixed to obtain a mixture. Weigh 12kg NaOH and 0.5kg curing agent, and configure them into 25% NaOH solution and 1.1% curing agent solution respectively. Mix the NaOH solution and the curing agent solution, add them to the mixture, and send them to the silo for full stirring, and finally enter the briquetting system and cold press them into 90mm:40mm:40mm pellets under a pressure of 10MPa, and air-dry to obtain the target slag discharge agent.

[0027] Every 7 days, 800kg of the above-mentioned slagging agent is added twice to the triangular area of ​​the electric furnace and / or the bottom of the electrode 2 hours bef...

Embodiment 2

[0030] A preparation method of a slagging agent for improving the slagging efficiency of industrial silicon smelting. The specific steps are as follows: 500kg of calcium oxide is broken into particles with a particle size of 2mm, 500kg of charcoal powder, and 500kg of petroleum coke powder are mixed evenly, and 120kg of GY is added. Coal pellet dry powder binder, mixed to obtain a mixture. Weigh 22kg NaOH and 0.9kg curing agent, and configure them into 40% NaOH solution and 1.6% curing agent solution respectively. Mix the NaOH solution and the curing agent solution, add them to the mixture, and send them to the silo for full stirring, and finally enter the briquetting system and cold press them into 80mm:50mm:35mm pellets under a pressure of 15MPa, and air dry to obtain the target slag discharge agent.

[0031] Every 10 days, add 100kg of the above-mentioned slagging agent to the triangular area of ​​the electric furnace and / or the bottom of the electrode 2 hours before the s...

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Abstract

The invention provides a slagging agent for improving slagging and slagging efficiency in industrial silicon smelting and a preparation method thereof. The slagging agent comprises the following main materials: calcium oxide and carbonaceous powder in a weight ratio of (1-3): (1-3). The preparation method of the slagging agent is characterized by comprising the following steps: firstly, crushing calcium oxide until the particle size is less than or equal to 3mm for later use, respectively preparing NaOH and a curing agent into a 25-50% NaOH solution and a 1.1-2.1% curing agent solution, uniformly mixing the NaOH solution and the curing agent solution, then adding the crushed calcium oxide and a mixture of charcoal powder, petroleum coke powder and dry powder binder, uniformly mixing, fully stirring in a material bin, enabling the materials to enter a ball pressing system under the action of self gravity to be cold-pressed into pellets, and drying the pellets. The carbon and calcium pellets replace large-particle limestone in a traditional process, the deslagging effect is obviously improved compared with that of a traditional method, the slag production rate is increased to 12.94% from 10.04% and is increased by 2.9%, due to the fact that the deslagging effect in a furnace is good, the furnace condition is improved, the yield is obviously increased, and the average daily yield is increased to 51.822 tons per day from 49.399 tons per day and is increased by 2.423 tons.

Description

technical field [0001] The invention belongs to the technical field of industrial silicon smelting, and in particular relates to a slagging agent for improving the slagging efficiency of industrial silicon smelting and a preparation method thereof. Background technique [0002] Industrial silicon is a product obtained by high temperature reduction smelting in a submerged arc furnace with silica as raw material and carbonaceous raw material as reducing agent. In the process of industrial silicon smelting, commonly used reducing agents include charcoal, petroleum coke, and washed coal. Charcoal has been used as the preferred reducing agent for industrial silicon smelting because of its characteristics of high fixed carbon, high specific resistance, and low impurity content. However, due to the influence of the ecological environment protection policy, the production of charcoal is prohibited. Industrial silicon production enterprises can only explore and use non-woody reducing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D25/00C01B33/025
CPCF27D25/00C01B33/025
Inventor 卢国洪杨贵明徐福昌王正勇张忠益张塾康李永强范奉伟李国阳沈庆伟
Owner 云南永昌硅业股份有限公司
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