Method for floating coal by using modified waste oil as flotation agent

A flotation agent and waste oil technology, applied in the field of coal flotation, can solve the problems of soil, water and air pollution, low yield of flotation clean coal, and difficulty in large-scale application, so as to broaden the utilization efficiency and broaden the utilization channels , high cost reduction effect

Inactive Publication Date: 2011-09-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The consumption of chemicals in the flotation process is large, the yield of flotation clean coal is low, the cost of coal preparation is high, the application is limited, and it is difficult to apply on a large scale
In addition, diesel oil and kerosene itself contain more than 10% aromatic hydrocarbons. The chemical structure of this substance is very stable, and it is not easy to degrade under natural environmental conditions. It will cause persistent and serious pollution to soil, water and the atmosphere. Human beings are more harmful, and kerosene and light diesel oil are energy-short materials. It is an urgent need to develop cheap coal flotation agents and reduce consumption to save energy and improve coal flotation benefits.

Method used

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  • Method for floating coal by using modified waste oil as flotation agent
  • Method for floating coal by using modified waste oil as flotation agent
  • Method for floating coal by using modified waste oil as flotation agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the method described in (1), the waste oil is modified, and the modified waste oil is used as a coal flotation agent, and the coal is floated with the yield and ash content of clean coal and tailing coal as indicators, and In the prior art, the flotation effect of the coal flotation method using diesel oil as collector and sec-octanol as frother was compared.

[0027] The medium and low ash coal Jincheng anthracite raw coal and lump coal are coarsely crushed and finely crushed to obtain flotation coal (particle size ≤ 3mm, ash content 10.5%), using XDF series single-cell flotation machine (volume 200mL, speed 1800r / min), the coal concentration is 80g / L, and the amount of flotation agent per ton of coal is 0.72kg. The flotation results of coal are as follows:

[0028]

[0029] The medium-ash coal Taoshan Mine lignite raw coal of Heilongjiang Qitaihe Coal Industry Group Co., Ltd. was used to obtain flotation coal (particle size ≤ 3mm, ash content 27.04%) ...

Embodiment 2

[0032] According to the method described in (1), the waste oil is modified, and the modified waste oil is used as a coal flotation agent, and the clean coal ash is used as an index, and the same coal with different flotation ratios and different particle sizes is used for flotation tests. And compared with the prior art using diesel oil as collector and sec-octanol as frother for flotation of clean coal ash.

[0033] The raw lignite coal from the Taoshan Mine of Heilongjiang Qitaihe Coal Industry Group Co., Ltd. was coarsely crushed and finely crushed to obtain flotation coal (ash content 27.04%), and the XDF series single-slot flotation machine (volume 200mL , the speed is 1800r / min), the coal concentration is 80g / L, and the amount of flotation agent per ton of coal is 0.91kg. 3mm coal, large particle coal refers to coal with a particle size > 3mm) for flotation, and the coal flotation results are as follows:

[0034]

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PUM

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Abstract

The invention discloses a method for floating coal by using modified waste oil as a flotation agent, which comprises: determining the modification conditions of waste oil by using clean coal yield as an index; mixing ethanol and waste oil according to a molar ratio of 3:1 to 10:1; adding 0.4 to 1.0 mass percent of alkaline earth and 0.01 to 0.05 mass percent of aluminum oxide serving as a catalyst under the pressure of 3 to 5 kg; heating to 40 to 80 DEG C, and stirring and reacting for 0.5 to 4.5 hours to obtain modified waste oil; directly using the modified waste oil in coal flotation, preparing 75 grams of coal sample, pre-stirring for 2 minutes, mixing slurry for 3 minutes, and floating for 3 minutes; and finally, floating coal varieties with different ash content and particle sizes by using the yields of clean coal, waste coal and ash content after flotation as indexes and using modified waste oil in a flotation amount of 0.72 kilograms per ton of coal and 0.91 kg per ton of coalaccording to a flotation ratio of 4:1 and 5:1. The method of the invention is simple, can change waste materials into valuable materials, is low in cost and environment-friendly, and provides a new approach for utilizing waste oil.

Description

technical field [0001] The invention relates to a method for modifying waste oil, and also relates to a method for flotation of coal, in particular to a method for flotation of coal by using modified waste oil as a flotation agent. Background technique [0002] Waste oil refers to the general term for all kinds of oils that lose their edible value after use. They mainly include swill oil, waste oil and frying oil. Swill oil is the waste oil after eating in hotels and restaurants; greasy floating matter in; frying oil is waste oil used after frying food etc. Among them, most of them are waste oils from catering. The rancidity and carbonyl value in waste oils far exceed the national edible oil hygiene indicators. These waste oils are highly oxidized toxic oils that have been eaten, and will produce highly toxic aflatoxins. The toxicity is 100 times that of arsenic, and it is the strongest chemical carcinogen found so far. Experiments have shown that long-term low-dose consum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00B03D1/004
Inventor 张永发徐英张国杰孙亚玲李香兰
Owner TAIYUAN UNIV OF TECH
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