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Method for desulphurization through oxidation of high-sulfur coal with combination of microwaves and auxiliary agents

A high-sulfur coal and microwave technology, applied in the field of coal desulfurization, can solve the problems of high desulfurization efficiency, low organic sulfur removal rate, slow bacterial growth, etc. short effect

Active Publication Date: 2015-12-09
CHONGQING UNIV
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Problems solved by technology

[0005] The invention of application number 201010507893.0 discloses a method of desulfurizing coal by using high-low magnetic separation technology. The process uses high-gradient magnetic The separator has sorted high-sulfur coal, but it can only remove pyrite sulfur in inorganic sulfur and the desulfurization rate is not high; the application number is 01102187.X invented a microbial coal desulfurizer, but there is stability The problems of high desulfurization cost, slow bacterial growth and high desulfurization cost have restricted industrial application; Patent No. 01102191.8 invented a desulfurization and as

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  • Method for desulphurization through oxidation of high-sulfur coal with combination of microwaves and auxiliary agents

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Experimental program
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Effect test

Embodiment 1

[0035] Example 1: A desulfurization method for oxidizing high-sulfur coal with microwave combined with additives: the raw coal in this embodiment is Nantong coal.

[0036] Put 20g of Nantong coal crushed, screened (particle size less than 74um) and dried into a 250ml Erlenmeyer flask, add 2ml of alcohol to wet the coal sample, then add 100ml of 2mol / L NaOH solution and 100ml of 2% NaOH Hydrogen peroxide, stirred at room temperature for 30 minutes, and then filtered, the filtered coal sample was subjected to microwave irradiation for 15 minutes, the microwave power was 1000W, the coal sample was taken out, filtered and washed until the filtrate pH<9, the NaOH and hydrogen peroxide remaining on the surface were removed, and the The coal sample filter cake obtained by filtration was dried in a drying oven at 110°C for 3-4 hours to obtain low-sulfur coal.

[0037] The total sulfur content in the low-sulfur coal obtained in Coal Example 1 was detected by the Ischka method.

[00...

Embodiment 8

[0044] Embodiment 8: A desulfurization method for oxidizing high-sulfur coal with microwave combined with additives: the raw coal in this embodiment is Laigang coal.

[0045]Put 20g of crushed, sieved (particle size less than 300um) dried Laigang coal into a 250ml Erlenmeyer flask, add 2ml of alcohol to wet the coal sample, then add 100ml of 4mol / L NaOH solution and 100ml of 4% hydrogen peroxide, at room temperature Stir at low temperature for 10 minutes, then filter, irradiate the filtered coal sample with microwave for 5 minutes, the microwave power is 300W, take out the coal sample, filter and wash until the filtrate pH<9, remove the residual NaOH and hydrogen peroxide on the surface, put the filter cake Dry it in a drying oven at 110°C for 3 hours to obtain low-sulfur coal.

[0046] The method desulfurization effect of embodiment 8 is as table 3:

[0047] table 3

[0048] coal type Sulfur content before desulfurization Sulfur content after desulfurization...

Embodiment 9

[0050] Put 20g of crushed, sieved (particle size less than 150um) dried Nantong coal into a 250ml Erlenmeyer flask, add 1ml of alcohol to wet the coal sample, then add 100ml of 4mol / L NaOH solution and 100ml of 10% hydrogen peroxide, at room temperature Stir at low temperature for 20 minutes, without microwave irradiation, wash directly, filter and separate, take out the coal sample, filter and wash the filtrate pH<9, remove the residual NaOH and hydrogen peroxide on the surface, put the filter cake in a drying oven at 90°C for drying 4h to get low-sulfur coal.

[0051] The method desulfurization effect of embodiment 9 is as table 4:

[0052] Table 4

[0053] coal type Sulfur content before desulfurization Sulfur content after desulfurization Desulfurization rate Nantong Coal 2.84% 1.72% 39.57%

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Abstract

The invention discloses a method for desulphurization through oxidation of high-sulfur coal with combination of microwaves and auxiliary agents. The method comprises the following steps: wetting agents and reaction auxiliary agents are added in crushed coal dust, stirring is carried out for certain time, the reaction auxiliary agents and the coal dust are separated through filtering, the coal dust after reaction is placed under microwave radiation and a reaction is carried out; after irradiation is carried out for certain time, low-sulfur coal after desulphurization is obtained through washing filtering. The desulfurization rate of the method is high, and damage to the coal structure is slight, and the method has a removal effect on both organic sulfur and inorganic sulfur. The reaction auxiliary agents are cheap, easy to recycle and have little corrosion to devices. The microwave radiation reaction time is short and the efficiency is high. The coal dust and the reaction auxiliary agents are contacted and mixed fully, and the desulfurization rate is high.

Description

technical field [0001] The invention relates to the field of coal desulfurization, in particular to a method for desulfurizing high-sulfur coal oxidized by microwave combined with additives. Background technique [0002] As a large coal country, my country accounts for more than 75% of the primary energy structure, and about 80% of the coal is used through direct combustion, which produces a large amount of SO 2 pollute the atmosphere and cause acid rain. If high-sulfur coal is directly used for coking, the quality of coke will be greatly affected, and the use of this coke for ironmaking will increase the sulfur load of the blast furnace, resulting in hot embrittlement of steel. [0003] At present, coal desulfurization technology can be divided into desulfurization before combustion, sulfur fixation during combustion and desulfurization after combustion. In-combustion desulfurization refers to the removal of SO in the process of coal combustion 2 Including spraying calci...

Claims

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Application Information

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IPC IPC(8): C10L9/06
Inventor 张生富张鹏奇邱淑兴邱贵宝温良英刘伟
Owner CHONGQING UNIV
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