Preparation method of coal slime flotation accelerant and coal slime flotation method

A technology of coal slime flotation and accelerator, applied in flotation, solid separation, etc., can solve the problems of high ash content of clean coal, high synthesis cost, complex synthesis process, etc., to reduce interfacial tension, increase clean coal yield, The effect of improving dispersion

Active Publication Date: 2014-09-10
SHANDONG UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In order to overcome the high ash content of clean coal caused by alkylphenol polyoxyethylene ether accelerators, which greatly affects the quality of clean coal products, and the high synthesis cost and complex synthesis process of alkylphenol polyoxyethylene ether sodium sulfate accelerators, the flotation The dispersing effect of coal slime on hydrocarbon oil is poor, and the technical defect of hydrocarbon oil collector is large, while retaining the advantages of both, the invention provides a preparation method of coal slime flotation accelerator

Method used

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  • Preparation method of coal slime flotation accelerant and coal slime flotation method

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Embodiment 1

[0032] Alkylphenol polyoxyethylene ether (the degree of polymerization of ethylene oxide is n=4-12) and sulfamic acid are used as raw materials, the molar ratio of the two is 1:0.5, and the reaction temperature is controlled at 70°C. During the synthesis process, it is necessary Stir continuously, and the reaction time is 30 minutes. After the reaction is completed, it can be lowered to normal temperature. The conversion rate of alkylphenol polyoxyethylene ether is 40.86%. The products obtained after the reaction include alkylphenol polyoxyethylene ether and synthetic Alkylphenol polyoxyethylene ether ammonium sulfate, and coexist in a molar ratio of 1.45:1.

[0033] In the flotation of coal slime, the amount of hydrocarbon oil collector is reduced by 23.71wt%, and the accelerant added accounts for 0.9wt% of hydrocarbon oil.

Embodiment 2

[0035] Alkylphenol polyoxyethylene ether (the degree of polymerization of ethylene oxide is n=4-12) and sulfamic acid are used as raw materials, the molar ratio of the two is 1:0.55, and the reaction temperature is controlled at 80°C. During the synthesis process, it is necessary to Stir continuously, and the reaction time is 35 minutes. After the reaction, it can be lowered to normal temperature. The conversion rate of alkylphenol polyoxyethylene ether is 45.62%. The products obtained after the reaction include alkylphenol polyoxyethylene ether and synthetic Alkylphenol polyoxyethylene ether ammonium sulfate, and coexist in a molar ratio of 1.2:1.

[0036] When flotation coal slime, the amount of hydrocarbon oil collector is reduced by 25.77wt%, and the accelerant added accounts for 1.1wt% of hydrocarbon oil.

Embodiment 3

[0038] Alkylphenol polyoxyethylene ether (the degree of polymerization of ethylene oxide is n=4-12) and sulfamic acid are used as raw materials, the molar ratio of the two is 1:0.6, and the reaction temperature is controlled at 90°C. During the synthesis process, it is necessary to Stir continuously, and the reaction time is 40 minutes. After the reaction is completed, it can be lowered to normal temperature. The conversion rate of alkylphenol polyoxyethylene ether is 49.21%. The products obtained after the reaction include alkylphenol polyoxyethylene ether and synthetic Alkylphenol polyoxyethylene ether ammonium sulfate, and coexist in a molar ratio of 1.03:1;

[0039] When flotation coal slime, the amount of hydrocarbon oil collector is reduced by 21.36wt%, and the accelerant added accounts for 1.5wt% of hydrocarbon oil.

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Abstract

The invention discloses a preparation method of coal slime flotation accelerant and a coal slime flotation method. The accelerant uses alkylphenol polyoxyethylene ether and sulfamic acid with the polymerization degree n=4-12 as raw materials, the mole ratio of the alkylphenol polyoxyethylene ether to the sulfamic acid is 1:0.5-1:0.6, reaction temperature is controlled at 70-90 DEG C, stirring is performed constantly during synchronization, reaction time is 30-40 minutes, and products are cooled to normal temperature after reaction to obtain the accelerant. When the accelerant is used for coal slime flotation, the amount of the accelerant accounts for 0.5-2wt% of that of collecting agent. Compared with methods independently using the hydrocarbon oil collecting agent, the coal slime flotation method using the accelerant has the advantages that under the situation of equivalent cleans ash, clean coal yield can be increased by 2-3wt%, oil saving rate can reach 20-30wt%, use amount of the hydrocarbon oil collecting agent is reduced favorably, separation index can be optimized, and overall economical benefits can be increased.

Description

technical field [0001] The invention relates to a coal slime flotation aid, in particular to a coal slime flotation accelerator. Background technique [0002] Flotation is the main method of coal slime recovery. It relies on the difference in the surface properties of coal and gangue to separate in the gas-solid-liquid three-phase. Coal slime flotation usually requires the addition of non-polar hydrocarbon oils (such as kerosene, diesel) as collectors to improve the surface hydrophobicity of coal particles. Coal (diesel) oil is insoluble in water and has poor dispersion in water. It can only exist in the form of larger "oil droplets" (>1mm), and the probability of contact, collision and adhesion with coal particles is small, and it will also aggregate into more Large oil droplets, therefore, the amount of coal (diesel) oil is higher. In addition, kerosene and diesel mostly come from petroleum cracking products. As the oil price rises, the cost of coal preparation will i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00B03D1/018B03D101/02B03D101/04
Inventor 李琳吕宪俊崔广文刘惠杰
Owner SHANDONG UNIV OF SCI & TECH
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