微波輻照輔助煤泥水沉降試驗(yàn)的研究
[Abstract]:At present, flocculation sedimentation is the main treatment method of coal slurry in coal preparation plants in China. However, because of the poor quality of coal in our country, the high ash content coal accounts for a large proportion, and there is a serious mudding phenomenon in the coal washing and separation, which makes the coal slime difficult to settle. Therefore, the amount of medicament needed to treat coal slurry is increasing, and the cost of buying flocculant is becoming higher and higher. In this experiment, microwave technology and flocculation sedimentation technology are combined to form microwave-flocculation technology to treat coal slime water, in order to reduce the dosage of medicament and save the cost of using medicament. In this paper, the slurry of Wangfenggang Coal preparation Plant in Huainan City was studied. At first, some basic properties of coal slurry are studied. The coal slurry is sifted by vibrating screen, and the particle size and ash distribution of 0.5mm slime are analyzed, and the mineral composition of coal slurry is analyzed by X-ray diffractometer. The particle size composition of-0.045mm slime was analyzed by laser particle size analyzer. The test results show that-0.045mm grain-grade slime accounts for 86.94 and the ash is divided into 56.48 and belongs to high ash and fine slime. However, 78.37% of the slime size in-0.045mm grade slime is less than 0. 01 mm, so it is difficult to settle in the slurry. Clay minerals such as kaolinite, montmorillonite and quartz are found in the slime. The Zeta potential of the slime water is -25.1mV, which makes the clay mineral particles in the slime water repel each other and form a relatively stable structure, which is difficult to settle. Then, the effect of single flocculant and single coagulant on the treatment of coal slime water was studied, and the optimum dosage of slurry water was determined under different conditions. After that, the effect of flocculant and coagulant on the sedimentation of coal slime water after microwave pretreatment was studied. The orthogonal experiments were carried out on three factors and three levels: dosage, microwave irradiation power and microwave irradiation time. The experimental results take the transmittance of coal slime water, the initial settling velocity and the sediment height after clarification as the evaluation indexes, and determine the primary and secondary order of each factor by intuitionistic analysis, and determine the best combination of factors under different conditions. The mechanism of flocculation and microwave assisted flocculation were studied. The results showed that: (1) when the anionic polyacrylamide (APAM) flocculant was used to treat coal slime water, the optimum addition amount of flocculant was 1.2ml (0.0048g/L), and the transmittance after settling 20min was 86.7%. When microwave flocculation combination technology is used, When the addition of flocculant was reduced to 0.7ml (0.0028g/L), the settling effect of slime water was basically the same as that of 1.2ml (0.0048g/L). (2) when 12H2O was used. KA1 (SO4) 2) coagulant for treating coal slime water, The optimum coagulant addition amount is 14m1 (0.56g/L), and the transmittance after settling 20min is 92.4%. When microwave coagulation combination is used, the amount of coagulant added can be reduced to 10ml (0.4g/L), The sedimentation effect of slime water is basically the same as that of 14ml (0.56g/L). (3) the appropriate microwave power and irradiation time can improve the sedimentation effect of slime water and reduce the dosage of medicament. Reduce the cost of using the medicament; However, if the microwave power is too high or the irradiation time is too long, the sedimentation effect of coal slime water will be reduced. (4) the effect of the combination of microwave heating and flocculant is better than that of common heating and flocculant.
【學(xué)位授予單位】:安徽理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TD94
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