【摘要】：選煤廠煤泥常采用0.5 mm分級,大于0.5 mm采用重力分選,小于0.5 mm煤泥采用浮選。但由于煤泥離心機篩籃破損等原因,離心液和磁選尾礦中常常含有較多粗粒精煤,加之分級設(shè)備(比如分級旋流器)分級效率不可能達到100%,導(dǎo)致入浮煤泥中含有較多粗粒精煤,傳統(tǒng)的浮選機和浮選柱都不能很好的回收這部分煤泥。本論文在旋流微泡浮選柱(FCMC)基礎(chǔ)上,運用串聯(lián)浮選的思想,構(gòu)建了新型雙層浮選柱試驗系統(tǒng),由一段短體充氣式浮選柱和二段FCMC組成。通過析因試驗和正交試驗,探索了一段充氣量、入料濃度、捕收劑用量、循環(huán)壓力對浮選效果的影響規(guī)律,確定了較佳工藝參數(shù)。在相同工藝條件下,對比浮選機、FCMC和新型雙層浮選柱對寬粒級煤粉的浮選效果,探究新型雙層浮選柱提高粗粒煤泥回收率的可行性。試驗采用寬粒級煤樣(0.7~0 mm),新型雙層浮選柱試驗結(jié)果表明:在相同一段充氣量、相同入料濃度下,隨著循環(huán)壓力增大,總精煤產(chǎn)率和灰分逐漸增大,循環(huán)壓力為0.14MPa時,浮選完善指標較高;在相同一段充氣量、相同循環(huán)壓力下,隨著入料濃度升高,總精煤產(chǎn)率和灰分呈增大趨勢,浮選完善指標先增大后減小;在相同入料濃度、相同循環(huán)壓力下,隨著一段充氣量增大,二段精煤產(chǎn)率逐漸減小,二段精煤灰分呈增大趨勢,總精煤灰分也增大,一段充氣量為0.05 m3/h時,浮選完善指標最大。入料濃度、捕收劑、一段充氣量對總精煤產(chǎn)率影響均較顯著,入料濃度、一段充氣量、捕收劑對總精煤灰分影響均較顯著,入料濃度對浮選完善指標影響顯著。相同工藝條件下,對于0.7~0.25 mm粒級,FCMC回收率(占本級)為51.85%,灰分為5.91%,浮選機比FCMC回收率高3.77%,灰分高0.59%;新型雙層浮選柱比浮選機回收率高4.06%,灰分下降0.43%。新型雙層浮選柱尾煤中低密度物(-1.5 kg/L)含量比浮選機、FCMC低,高密度級(+1.5 kg/L)灰分比FCMC、浮選機高,然而新型雙層浮選柱精煤中高密度級(+1.5 kg/L)含量比FCMC和浮選機略高。新型雙層浮選柱通過兩段浮選,有效提高了粗粒精煤的回收率。與浮選機、FCMC相比,新型雙層浮選柱浮選粗粒含量較多的煤泥時,對粗顆粒的回收率更高。
[Abstract]:Coal slime in coal preparation plant is usually classified by 0.5 mm, gravity separation is used for more than 0.5 mm, and flotation is used for slime less than 0.5 mm. However, due to the breakage of the sieve basket of the slime centrifuge, the centrifugal fluid and magnetic separation tailings often contain more coarse-grained refined coal, and the classification efficiency of the classifying equipment (such as the classifying cyclone) cannot reach 100%, which results in the inclusion of more coarse-grained coal in the floating slime. The traditional flotation machine and flotation column can not recover this part of coal slime very well. On the basis of (FCMC), a new double-layer flotation column test system is constructed by using the idea of series flotation. The system is composed of a short-body aerated flotation column and a two-stage FCMC. By means of factorization test and orthogonal test, the effects of charge volume, feed concentration, collector dosage and circulation pressure on flotation effect were investigated, and the better technological parameters were determined. Under the same technological conditions, the flotation effects of FCMC and a new double-layer flotation column on wide-grained pulverized coal were compared, and the feasibility of the new double-layer flotation column to increase the recovery rate of coarse coal slime was explored. The test results of a new double-layer flotation column with wide grain size (0.7 ~ 0 mm),) showed that the total clean coal yield and ash content increased with the increase of circulation pressure at the same aeration rate and the same feed concentration, and when the circulation pressure was 0.14MPa, the total clean coal yield and ash content gradually increased with the increase of circulation pressure. The improvement index of floatation is higher, the total clean coal yield and ash content increase with the increase of feed concentration under the same aeration volume and the same circulation pressure, and the flotation consummation index increases first and then decreases, and at the same feed concentration, the total clean coal yield and ash content increase at the same feed concentration. Under the same circulation pressure, the yield of the second stage of clean coal decreases gradually with the increase of the aeration rate of the first stage, the ash content of the second stage of the clean coal increases, and the total ash content of the clean coal increases, and the flotation consummation index is the largest when the air volume of the first stage is 0.05 m3 / h. The effect of feed concentration, collector and first stage aeration rate on the total clean coal yield is significant. The feed concentration, the first stage aeration rate and the collector have significant effects on the ash content of the total clean coal, and the feed concentration has a significant effect on the flotation consummation index. Under the same technological conditions, the recovery rate of 0.70mm 0.25mm particle grade FCMC is 51.85, the ash is 5.91, the floatation machine is 3.77g higher than FCMC, and the ash content is 0.59.The new double-layer flotation column has a higher recovery rate of 4.06g and a decrease of 0.43. The content of low density (-1.5 kg/L) in the new double-layer flotation column tail coal is lower than that in flotation machine. The ash content of high density grade (1.5 kg/L) is higher than that of FCMC and flotation machine. However, the content of high density grade (1.5 kg/L) in the new double-layer flotation column coal is slightly higher than that in FCMC and flotation machine. The new double-layer flotation column can effectively improve the recovery rate of coarse-grained clean coal by two-stage flotation. Compared with floatation machine FCMC, the recovery rate of coarse particles is higher when the coal slime with more coarse particles is floated by the new double-layer flotation column.
【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】：2015
【分類號】：TD94

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本文編號：2198560