本文關(guān)鍵詞： 充氣旋流浮選柱 充氣量 粒度組成 浮選動力學(xué) 浮選效果　出處：《中國礦業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：針對當前浮選工藝中加強粗粒物料的回收,造成高灰細泥在泡沫產(chǎn)品中的機械夾帶,導(dǎo)致細精煤灰分偏高;相反,降低細泥對精煤灰分的影響,又導(dǎo)致部分粗粒精煤損失在尾煤中,而傳統(tǒng)浮選設(shè)備難以對粗細煤泥同時實現(xiàn)有效分選,結(jié)合旋流浮選柱和充氣浮選柱的優(yōu)點,開展了充氣旋流浮選柱充氣性能對煤泥粒度影響研究,通過經(jīng)典動力學(xué)對不同粒級煤泥的浮選動力學(xué)過程進行了探究。充氣旋流浮選柱煤泥浮選試驗研究對于提高全粒級煤泥浮選效果具有非常重要的意義,0.5-0.25mm粒級煤泥,柱體從下到上,產(chǎn)率逐漸降低,而0.125-0.074mm和-0.074mm粒級,其產(chǎn)率逐步增加,處于中間的0.25-0.125mm粒級煤泥,低充氣量下,產(chǎn)率隨柱體高度變化不明顯,充氣量達到一定程度時,產(chǎn)率波動較大,總體呈上升趨勢;煤泥灰分隨柱體高度的升高而降低,柱體上浮選段煤泥灰分梯度相比中、下浮選段更大,而且充氣量越高,灰分梯度越明顯;精煤篩分結(jié)果發(fā)現(xiàn),充氣量由0.25m3/h提高到1.0m3/h時,0.5-0.25mm和0.25-0.125mm煤泥回收率加和從15.20%增至39.35%,而0.125-0.074mm和-0.074mm粒級煤泥增幅則緩慢很多。充氣旋流浮選柱不同粒級煤泥浮選動力學(xué)研究發(fā)現(xiàn),增加充氣量能顯著提高各粒級煤泥的浮選速度常數(shù),浮選早期階段,細粒級煤泥(0.25-0.074mm)浮選速度最快,隨著時間延長,粗粒級煤(0.5-0. 25mm)浮選速度優(yōu)于細粒級,且回收率更高,通過增加充氣量可提高粗粒煤泥在充氣旋流浮選柱中的分選效果。對充氣旋流浮選柱各粒級煤泥浮選動力學(xué)試驗結(jié)果進行了擬合,0.25m3/h充氣量下,0.5-0.25mm煤泥符合經(jīng)典一級動力學(xué)模型,0.5m3/h和0.75m3/h充氣量時,一級矩形分布模型符合度最高,1.0m3/h充氣量下,二級動力學(xué)模型擬合度最好;而0.25-0.074mm和-0.5mm煤泥,充氣量為0.75m3/h時,符合一級矩形分布模型,其他充氣量下,浮選過程二級動力學(xué)模型匹配度最高;建立了適合描述不同充氣量下各粒級煤泥浮選過程的新動力學(xué)模型,其表達式為:式中a、b、c、d為相關(guān)參數(shù),通過驗證,該模型具有較高的可靠性。充氣旋流浮選柱提高充氣量能明顯改善煤泥的分選效果,可實現(xiàn)對粗粒煤泥的有效回收,對于工業(yè)應(yīng)用有一定的借鑒意義。
[Abstract]:In view of strengthening the recovery of coarse grain materials in the current flotation process, the mechanical entrainment of high ash and fine mud in foam products leads to higher ash content of fine clean coal, on the contrary, reducing the influence of fine mud on ash content of clean coal, However, it is difficult for traditional flotation equipment to realize effective separation of coarse and fine slime at the same time, which combines the advantages of swirl flotation column and aerated flotation column. The effect of aeration performance on the particle size of coal slime was studied. The flotation kinetics of coal slime with different particle size was studied by classical kinetics. The experimental study on flotation of coal slime with aerated swirl flotation column is of great significance for improving the flotation effect of coal slime with full particle size of 0.5-0.25mm. From the bottom to the top, the yield of the column gradually decreased, while the yield of 0.125-0.074mm and -0.074mm increased gradually, and the coal slime of 0.25-0.125mm was in the middle. Under the condition of low aeration, the yield did not change obviously with the height of the column, and when the aeration reached a certain degree, the yield fluctuated greatly. As a whole, the ash content of coal slime decreases with the increase of column height. Compared with the gradient of ash content in the column flotation section, the lower section is larger, and the higher the amount of aeration, the more obvious the ash gradient is. When the aeration rate increased from 0.25 m3 / h to 1.0m3 / h, the recoveries of 0.5-0.25mm and 0.25-0.125mm slime increased from 15.20% to 39.35mm, while the increase of 0.125-0.074mm and -0.074mm granular slime was much slower. At the early stage of flotation, the floatation rate of fine coal slime is the fastest. With the increase of time, the flotation rate of coarse grained coal is better than that of fine coal, and the recovery rate is higher. The separation effect of coarse coal slime in aerated swirl flotation column can be improved by increasing the amount of aeration. The flotation kinetic test results of each particle grade slime of aerated swirl flotation column are fitted with the results of 0.25m3 / h aeration volume and 0.5-0.25mm coal slime accords with the classical first order. When the kinetic model is 0.5 m3 / h and 0.75 m3 / h, The fitting degree of the second-order dynamic model is the best when the consistency of the first-order rectangular distribution model is the highest (1.0 m3 / h), but when 0.25-0.074 mm and -0.5 mm slime, the aeration rate is 0.75 m3 / h, it accords with the first-order rectangular distribution model and other inflatable quantities. A new dynamic model is established to describe the flotation process of coal slime with different amount of aeration. The expression of the model is as follows: a / B / C / d is the relevant parameter, and it is verified that the model can be used to describe the flotation process of coal slime. The model has a high reliability and can obviously improve the separation effect of coal slime by increasing the aeration volume of the aerated swirl flotation column, and can realize the effective recovery of coarse coal slime, which has certain reference significance for industrial application.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD94;TD923

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