本文選題：高嶺石 + 煤�。� 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：高嶺石顆粒粒度小、表面荷較強(qiáng)的同性電荷且顆粒間存在水化斥力,在懸浮液中穩(wěn)定分散,導(dǎo)致煤泥水和某些工業(yè)廢水難以處理。在工業(yè)中,高嶺石是一種重要的功能材料。如果將微細(xì)高嶺石從煤泥水等中分選出來不僅降低煤泥水和相關(guān)廢水處理難度,而且將其資源化利用。但是煤泥水中的高嶺石和煤相關(guān)性質(zhì)復(fù)雜,采用目前常規(guī)方法難以實(shí)現(xiàn)煤泥水中微細(xì)高嶺石顆粒的提取,迫切需要研究高嶺石和煤界面調(diào)控方法,以實(shí)現(xiàn)微細(xì)高嶺石礦物高度富集。通過聚團(tuán)沉降試驗(yàn)研究溶液pH、顆粒粒度、金屬離子、表面活性劑、非極性油、加藥順序、攪拌速度和攪拌時(shí)間對(duì)微細(xì)高嶺石顆粒聚團(tuán)特性的影響規(guī)律,結(jié)果表明,當(dāng)pH6時(shí),微細(xì)高嶺石顆粒表現(xiàn)為強(qiáng)烈的聚團(tuán)行為且受粒度和pH影響較小,沉降產(chǎn)率均大于80%;當(dāng)pH6時(shí),D502.72 μm顆粒聚團(tuán)行為受pH影響較大,由聚團(tuán)趨向于分散為主,D5011.78 μm受pH和粒度影響較小;隨著K+、Mg2+和Fe3+金屬離子濃度增大,沉降產(chǎn)率增加,且隨著離子價(jià)態(tài)的增加效果越明顯;十二胺醋酸鹽較油酸鈉和Tween80更有利于高嶺石顆粒聚團(tuán)沉降;添加非極性油可強(qiáng)化聚團(tuán)沉降效果;十二胺醋酸鹽、柴油和乳化劑Span80添加順序?qū)蹐F(tuán)沉降影響較小;隨著攪拌速度的增大及攪拌時(shí)間的增加,沉降產(chǎn)率先增大后變化較小。溶液pH、金屬離子、分散劑、攪拌速度和攪拌時(shí)間對(duì)微細(xì)煤顆粒分散特性影響規(guī)律的研究結(jié)果表明:當(dāng)pH6時(shí),煤顆粒分散率隨著pH值增加而增大;當(dāng)pH6時(shí),隨著pH值增加而減小;隨著K+、Mg2+和Fe63+離子濃度的增大,分散率降低,離子對(duì)分散率的影響順序?yàn)?Mg2+Fe3+K+;當(dāng)木質(zhì)素磺酸鈉濃度小于0.2 g/L和大于3.0 g/L時(shí)煤顆粒分散率較大,添加腐殖酸鈉、a-烯基磺酸鈉和羥丙基甲基纖維素對(duì)分散率的影響與木質(zhì)素磺酸鈉相似;煤顆粒分散率隨Na2Si03濃度的增加而增大,隨Na2C03和木質(zhì)素胺濃度的增加反而減小;煤顆粒分散率隨著攪拌速度的增大及攪拌時(shí)間的增加先增大后趨于不變。研究了高嶺石與煤配比、礦漿濃度、礦物粒度、溶液pH、金屬離子、分散劑、凝聚劑、表面疏水活性劑、攪拌速度、攪拌時(shí)間、攪拌方式和分選工藝對(duì)微細(xì)高嶺石顆粒聚團(tuán)分選的影響規(guī)律。結(jié)果表明:當(dāng)高嶺石與煤配比為1:1,礦漿濃度為20%,pH=4.0,高嶺石粒度D5011.78μm,煤粒度0.045 mm,攪拌速度和時(shí)間分別為500 r/min和5 min時(shí)高嶺石聚團(tuán)分選效果明顯;添加K+、Mg2+和Fe3+離子均對(duì)高嶺石聚團(tuán)分選不利;聚鋁、糊精和磁力攪拌分別較十二胺醋酸鹽、木質(zhì)素磺酸鈉和機(jī)械攪拌更有利于微細(xì)高嶺石顆粒聚團(tuán)分選;二次聚團(tuán)分選工藝對(duì)其聚團(tuán)分選效果影響較小。
[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.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD97

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