Screening method for petroleum coke used for industrial silicon, carbonaceous reducing agent and smelting method for industrial silicon

A screening method, petroleum coke technology, applied in the smelting of industrial silicon, the screening of petroleum coke for industrial silicon, and the field of carbonaceous reducing agents, can solve the problems that have not been seen before, and the reactivity of petroleum coke needs to be improved, so as to improve efficiency, The effect of protecting forest resources and ecological environment and reducing production costs

Active Publication Date: 2019-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reactivity of petroleum coke in the reducing agent needs to be improved
[0005] Moreover, not all petroleum cokes are suitable as carbonaceous reducing agents for industrial silicon smelting. Therefore, in order to improve actual production efficiency, it is necessary to screen petroleum cokes that meet the conditions of use. However, there is no relevant report on the screening of petroleum coke under the conditions of use of high-quality reducing agents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0057] According to another preferred embodiment of the present invention, based on the weight of the carbonaceous reducing agent, the content of bituminous coal and / or anthracite is 30-70% by weight, the content of petroleum coke is 30-70% by weight, and the content of charcoal is 0% by weight;

[0058] Among them, petroleum coke meets the following conditions at the same time:

[0059] (1) The volatile matter content is 14-18% by weight,

[0060] (2) The Hash Grindability Index of the cake is 30-60.

[0061] In this preferred embodiment, further preferably, the petroleum coke also satisfies: the content of fixed carbon on a dry basis is 88-92% by weight;

[0062] Further preferably, the petroleum coke also satisfies: the sulfur content is 0-2% by weight.

[0063] Further preferably, the petroleum coke also meets the requirement that the ash content is 0-0.2% by weight.

[0064] Further preferably, the petroleum coke also satisfies that the content of Fe is 0-60ppm.

[0...

Embodiment

[0075] The present invention will be described in detail through examples below, but the present invention is not limited thereby. In the following examples, unless otherwise specified, all materials used are commercially available, and all methods used are conventional methods in the art.

[0076] Among them, the bituminous coal comes from Ningxia region, with a volatile content of 25% by weight and an ash content of 7.5% by weight.

[0077] The determination method of the volatile content in bituminous coal is: GB-T 212-2008 coal industrial analysis method.

[0078] The determination method of ash content in bituminous coal is: GB-T 212-2008 coal industrial analysis method.

[0079] The determination method of volatile matter content in petroleum coke is: SH / T0026-1990 determination method of volatile matter in petroleum coke.

[0080] The method of sintering treatment of petroleum coke includes: the sintering treatment process and conditions of petroleum coke in SH / T 0026...

Embodiment 1

[0096] Mix the silica and the carbonaceous reducing agent uniformly, the carbonaceous reducing agent includes bituminous coal and petroleum coke A, wherein, based on the weight of the carbonaceous reducing agent, the content of bituminous coal is 30% by weight, and the content of petroleum coke A is 70% by weight , the weight ratio of silica and carbonaceous reducing agent is 1:1.15, and the mixture is put into submerged arc furnace for smelting heat treatment.

[0097] During the smelting process, there were no undesired phenomena such as rising of the furnace bottom, stinging fire, and death of the material surface. The furnace is in good condition during the smelting process: it can be observed that the electrode is deeply and stably buried in the charge, the sinking speed of the charge surface is fast, the gas emerges evenly through the upper part of the furnace, the current load is stable, the silicon is produced smoothly, and the silicon production rate reaches 30.5%. , ...

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Abstract

The invention relates to the technical field of industrial silicon smelting and new energy, and discloses a screening method for petroleum coke used for industrial silicon, a carbonaceous reducing agent and a smelting method for the industrial silicon. The screening method includes the following steps: a performance parameter of the petroleum coke is determined, and the petroleum coke is screenedwhich simultaneously satisfies the following conditions: (1) the volatile matter content is not less than 13% by weight, (2) sintering processing is performed on the petroleum coke, and the obtained sintered product is a cake, and a Hardgrove grindability index of the cake is not more than 100. According to the screening method, the petroleum coke which satisfies a specific performance index is selected, the petroleum coke suitable as the carbonaceous reducing agent for the industrial silicon smelting can be obtained, thereby improving the selection efficiency of the petroleum coke in actual industrial silicon smelting production; and the carbonaceous reducing agent does not require or requires only a small amount of charcoal, production requirements can be ensured, the production cost isgreatly reduced, and the obtained silicon is high in grade and high in yield.

Description

technical field [0001] The invention relates to the technical fields of industrial silicon smelting and new energy, in particular to a method for screening petroleum coke for industrial silicon, a carbonaceous reducing agent and a method for smelting industrial silicon. Background technique [0002] Charcoal and coal washing are currently the commonly used carbonaceous reducing agents in the industrial silicon industry. Charcoal technology and coal washing oil coke technology are the mainstream processes for industrial silicon production. Due to the dependence of charcoal on forest resources, it seriously damages the ecological environment. With the strengthening of the protection awareness of forest resources, the supply of charcoal is becoming increasingly tense, and it has become a trend to reduce the amount of charcoal used. Therefore, it is necessary to find a new type of carbonaceous reducing agent suitable for industrial silicon smelting, so as to ensure the productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/025
CPCC01B33/025C01P2004/80C01P2006/80
Inventor 范启明
Owner CHINA PETROLEUM & CHEM CORP
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