微细高岭石颗粒聚团特性及聚团分选试验研究

发布时间：2018-05-11 21:39

本文选题：高岭石 + 煤　；参考：《安徽理工大学》2017年硕士论文

【摘要】：高岭石颗粒粒度小、表面荷较强的同性电荷且颗粒间存在水化斥力,在悬浮液中稳定分散,导致煤泥水和某些工业废水难以处理。在工业中,高岭石是一种重要的功能材料。如果将微细高岭石从煤泥水等中分选出来不仅降低煤泥水和相关废水处理难度,而且将其资源化利用。但是煤泥水中的高岭石和煤相关性质复杂,采用目前常规方法难以实现煤泥水中微细高岭石颗粒的提取,迫切需要研究高岭石和煤界面调控方法,以实现微细高岭石矿物高度富集。通过聚团沉降试验研究溶液pH、颗粒粒度、金属离子、表面活性剂、非极性油、加药顺序、搅拌速度和搅拌时间对微细高岭石颗粒聚团特性的影响规律,结果表明,当pH6时,微细高岭石颗粒表现为强烈的聚团行为且受粒度和pH影响较小,沉降产率均大于80%;当pH6时,D502.72 μm颗粒聚团行为受pH影响较大,由聚团趋向于分散为主,D5011.78 μm受pH和粒度影响较小;随着K+、Mg2+和Fe3+金属离子浓度增大,沉降产率增加,且随着离子价态的增加效果越明显;十二胺醋酸盐较油酸钠和Tween80更有利于高岭石颗粒聚团沉降;添加非极性油可强化聚团沉降效果;十二胺醋酸盐、柴油和乳化剂Span80添加顺序对聚团沉降影响较小;随着搅拌速度的增大及搅拌时间的增加,沉降产率先增大后变化较小。溶液pH、金属离子、分散剂、搅拌速度和搅拌时间对微细煤颗粒分散特性影响规律的研究结果表明:当pH6时,煤颗粒分散率随着pH值增加而增大;当pH6时,随着pH值增加而减小;随着K+、Mg2+和Fe63+离子浓度的增大,分散率降低,离子对分散率的影响顺序为:Mg2+Fe3+K+;当木质素磺酸钠浓度小于0.2 g/L和大于3.0 g/L时煤颗粒分散率较大,添加腐殖酸钠、a-烯基磺酸钠和羟丙基甲基纤维素对分散率的影响与木质素磺酸钠相似;煤颗粒分散率随Na2Si03浓度的增加而增大,随Na2C03和木质素胺浓度的增加反而减小;煤颗粒分散率随着搅拌速度的增大及搅拌时间的增加先增大后趋于不变。研究了高岭石与煤配比、矿浆浓度、矿物粒度、溶液pH、金属离子、分散剂、凝聚剂、表面疏水活性剂、搅拌速度、搅拌时间、搅拌方式和分选工艺对微细高岭石颗粒聚团分选的影响规律。结果表明:当高岭石与煤配比为1:1,矿浆浓度为20%,pH=4.0,高岭石粒度D5011.78μm,煤粒度0.045 mm,搅拌速度和时间分别为500 r/min和5 min时高岭石聚团分选效果明显;添加K+、Mg2+和Fe3+离子均对高岭石聚团分选不利;聚铝、糊精和磁力搅拌分别较十二胺醋酸盐、木质素磺酸钠和机械搅拌更有利于微细高岭石颗粒聚团分选;二次聚团分选工艺对其聚团分选效果影响较小。
[Abstract]:Kaolinite has small particle size, high surface charge and hydration repulsion between particles, which is stable and dispersed in suspensions, resulting in difficult treatment of coal slime water and some industrial wastewater. Kaolinite is an important functional material in industry. If fine kaolinite is separated from coal slime water, it not only reduces the difficulty of treating coal slime water and related wastewater, but also reuses it as a resource. However, the kaolinite and coal related properties in coal slime water are complex, so it is difficult to extract fine kaolinite particles from coal slurry by conventional methods, so it is urgent to study the control method of kaolinite and coal interface. In order to achieve the high enrichment of fine kaolinite minerals. The effects of solution pH, particle size, metal ions, surfactants, non-polar oil, drug addition sequence, stirring speed and stirring time on the aggregation characteristics of micro-kaolinite particles were studied by cluster sedimentation test. The results showed that, when pH6 was used, The fine kaolinite particles show strong agglomeration behavior and are less affected by particle size and pH, and the sedimentation yield is larger than 80, while the aggregation behavior of D502.72 渭 m particles is greatly affected by pH when pH6, and D5011.78 渭 m is slightly influenced by pH and particle size. With the increase of concentration of K _ (2) mg _ (2) and Fe3, the sedimentation yield increased, and the effect of dodecylamine acetate was more obvious than that of sodium oleate and Tween80, and the precipitation of kaolinite particles was more favorable to dodecylamine acetate than sodium oleate and Tween80. The addition of non-polar oil can enhance the agglomeration effect; the addition order of dodecylamine acetate, diesel oil and emulsifier Span80 has little effect on the agglomeration; with the increase of stirring speed and stirring time, the sedimentation yield increases first and then changes little. The effects of pH, metal ions, dispersant, stirring speed and stirring time on the dispersion characteristics of fine coal particles were studied. The results showed that the dispersion rate of coal particles increased with the increase of pH value when pH6, and decreased with the increase of pH value in pH6. With the increase of K ~ (2 +) mg _ (2) and Fe63 ion concentration, the dispersion rate decreases, and the order of influence of ions on dispersion rate is: (1) mg _ (2) Fe3 K, when the concentration of sodium lignosulfonate is less than 0.2 g / L and > 3.0 g / L, the coal particle dispersion rate is larger. The effect of sodium humic acid sodium a- allyl sulfonate and hydroxypropyl methyl cellulose on the dispersion was similar to that of sodium lignosulfonate, and the coal particle dispersion increased with the increase of Na2Si03 concentration, but decreased with the increase of Na2C03 and lignin amine concentration. With the increase of agitation speed and agitation time, the coal particle dispersion rate increases firstly and then tends to unchanged. The ratio of kaolinite to coal, slurry concentration, mineral particle size, pH value of solution, metal ion, dispersant, coagulant, surfactant, stirring speed, stirring time were studied. The effect of agitation and separation process on the separation of fine kaolinite particles. The results show that when the ratio of kaolinite to coal is 1: 1, the concentration of pulp is 20g pH ~ (+) 4.0, the granularity of kaolinite is D5011.78 渭 m, the particle size of coal is 0.045 mm, and the stirring speed and time are 500 r/min and 5 min, respectively, the separation effect of kaolinite aggregate is obvious. The addition of K _ (2) mg _ (2) and Fe3 ions is disadvantageous to the separation of kaolinite clusters, and polyaluminum, dextrin and magnetic stirring are more favorable than dodecylamine acetate, sodium lignosulfonate and mechanical agitation in the separation of fine kaolinite particles, respectively. The secondary agglomeration separation process has little effect on the separation effect.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD97

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