轮胎热解油及其乳状液作为新型煤用浮选捕收剂的试验研究

发布时间：2018-05-07 05:01

本文选题：浮选 + 轮胎热解油　；参考：《太原理工大学》2015年硕士论文

【摘要】：浮选是煤炭洗选过程中重要的环节之一，它可以有效地分选0.5mm以下的细粒煤泥。随着优质煤种不断被开采，采煤工艺的不断发展，导致了煤质变差和采矿过程中形成了大量煤泥。浮选在当前成为提高选煤厂工作效率和经济效益的愈来愈重要的工艺环节。在浮选过程中，添加的捕收剂将直接影响生产过程中的各指标。研发新型高效的捕收剂成为提高浮选效率的重要手段之一。本文通过研究轮胎热解油的捕收性，将其作为浮选捕收剂。并利用乳化技术，将其配置成为轮胎热解油乳状液。将乳状液作为捕收剂分别对三种不同煤泥进行了浮选试验，与不同捕收剂进行对比捕收性能，并对其浮选条件作出了优化。最后，对乳状液作用前后的煤样，进行了接触角、润湿热和红外光谱分析，探究其作用方式。主要做了以下工作： 1.利用轮胎热解油作为捕收剂对三种不同煤样进行了实验室单元浮选试验，并与煤油作捕收剂浮选同种煤泥的实验结果进行了对比。试验证明，轮胎热解油具备了作为煤用捕收剂的条件。 2.选择了Span-80、OP-10和Tween-20三种乳化剂用于乳化轮胎热解油。配制出稳定的水包油型乳状液。并进行了浮选试验，浮选实验结果表明，轮胎热解油乳状液具备了较强的捕收性，可以有效的降低药剂用量，提高精煤产率。 3.将配制的乳状液作捕收剂的浮选结果与7131型新型高效捕收剂浮选结果进行了比较。当用量较高时，轮胎热解油乳状液的浮选效果好于同用量的7131型捕收剂的效果。 4.改变浮选条件，在三种矿浆浓度（60g/L、80g/L、100g/L）和不同起泡剂用量（60g/t、80g/t、100g/t、120g/t、150g/t）的条件下分别进研究了矿浆浓度和起泡剂用量对轮胎热解油乳状液的浮选效果的影响。80g/L的矿浆浓度浮选效果最好。起泡剂用量为80g/t-100g/t时，效果最好。 5.通过对药剂煤样处理前后接触角的测定，轮胎热解油乳状液处理后的煤样接触角改变大于煤油处理煤样后的接触角，轮胎热解油处理后的煤样表面上润湿性由亲水转向了疏水。说明，轮胎热解油乳状液对煤样表面润湿性有较大改变。 6.测试煤油和轮胎热解油乳状液分别润湿煤样时的润湿热，轮胎热解油乳状液润湿煤样时的润湿热远大于煤油润湿煤样时的润湿热，说明，轮胎热解油乳状液更容易在煤粒表面吸附。 7.通过红外分析煤样处理前后的红外光谱。轮胎热解油乳状液在吸附煤粒表面时，，均为物理吸附。
[Abstract]:Flotation is one of the most important links in the process of coal washing. It can effectively separate fine coal slime below 0.5mm. With the continuous exploitation of high quality coal and the continuous development of coal mining technology, the quality of coal has become worse and a large amount of slime has been formed in the process of mining. Flotation has become a more and more important process to improve the efficiency and economic benefit of coal preparation plant. In the flotation process, the addition of collector will directly affect the production process of each index. Research and development of new and efficient collector has become one of the important means to improve flotation efficiency. In this paper, tire pyrolytic oil is used as flotation collector. And the emulsification technology was used to configure it into a tyre pyrolytic oil emulsion. Three different kinds of coal slime were tested by using emulsion as collector, and compared with different collector, and the flotation conditions were optimized. Finally, the contact angle, moist heat and infrared spectrum of the coal samples before and after the emulsion action were analyzed. The main tasks are as follows: 1. The laboratory unit flotation tests of three different coal samples were carried out using tyre pyrolysis oil as collector, and the results were compared with those of kerosene as collector. The test shows that the pyrolytic oil of tire has the condition to be used as collector for coal. 2. Three emulsifiers, Span-80 OP-10 and Tween-20, were selected for emulsified tire pyrolysis oil. A stable oil-in-water emulsion was prepared. The flotation experiment results show that the pyrolytic oil emulsion of tire has strong collecting ability, which can effectively reduce the dosage of reagent and increase the yield of clean coal. 3. The flotation results of emulsion as collector were compared with those of new type 7131 high efficiency collector. When the dosage is high, the flotation effect of tyre pyrolytic oil emulsion is better than that of 7131 type collector with the same dosage. 4. By changing the flotation conditions, the effects of pulp concentration and the amount of foaming agent on the flotation of tyre pyrolytic oil emulsion were studied under the conditions of 60g / L ~ 80g 路L ~ (-1) / L ~ (100 g / L) and 60 g / t ~ (-1) / t ~ (-1) ~ (100) g / t ~ (-1) of different foaming agents, respectively, and the effects of pulp concentration and the amount of foaming agent on the flotation effect of tyre pyrolytic oil emulsion were studied. When the amount of foaming agent is 80g/t-100g/t, the effect is the best. 5. Through the measurement of contact angle before and after treatment, the contact angle of coal sample treated with pyrolytic oil emulsion was larger than that of coal sample treated with kerosene, and the wettability of coal sample treated with pyrolytic oil changed from hydrophilic to hydrophobic. The results show that the wettability of pyrolytic oil emulsion on coal surface is changed greatly. 6. The wetting heat of kerosene and tyre pyrolytic oil emulsion is much higher than that of kerosene emulsion, which shows that the wetting heat of coal sample is much higher than that of kerosene emulsion sample. Tyre pyrolytic oil emulsion is easier to adsorb on the surface of coal particles. 7. The infrared spectra of coal samples before and after treatment were analyzed by IR. Tyre pyrolytic oil emulsion is physically adsorbed on the surface of coal particles.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD923.13;TD94

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