粘土泥化抑制對(duì)煤泥浮選的影響
發(fā)布時(shí)間：2018-07-31 19:21
【摘要】：粘土是煤中主要的雜質(zhì)礦物,也是主要的成灰礦物。粘土礦物在水中可泥化分散成微米級(jí)的晶層顆粒,對(duì)煤泥浮選產(chǎn)生影響。泥化抑制旨在從水-粘土接觸之初開(kāi)始,通過(guò)水溶液化學(xué)調(diào)整抑制粘土膨脹分散。這方面研究在調(diào)控煤泥水沉降方面已開(kāi)展。煤泥水粘土泥化抑制不可避免的對(duì)煤泥浮選產(chǎn)生影響。有鑒于此,本文開(kāi)展粘土預(yù)先泥化抑制和分散后調(diào)控(非抑制)對(duì)煤泥浮選影響的對(duì)比研究,以期為粘土泥化抑制的實(shí)際應(yīng)用提供參考。本文以蒙脫石和高嶺石與純煤配制的礦漿為研究對(duì)象,分別采用Ca2+和TMBAC為抑制劑,探索抑制粘土礦物泥化對(duì)浮選的影響。并通過(guò)顆粒粒度、Zeta電位和礦漿流變學(xué)特性分析其原因。對(duì)于蒙脫石-煤體系,在Ca2+抑制與非抑制條件下均表現(xiàn)為Ca2+濃度增加,可燃體回收率增加,精煤灰分增加。抑制蒙脫石泥化使浮選可燃體回收率最高可達(dá)92.60%,精煤灰分為5.20%,相同條件下非抑制為81.13%,精煤灰分為4.79%。其原因在于抑制粘土礦物泥化使煤漿中細(xì)粒蒙脫石含量降低,流體由牛頓型流體變?yōu)榉桥ｎD型流體,這有利于提高泡沫層穩(wěn)定性。對(duì)于高嶺石-煤體系,Ca2+抑制或非抑制高嶺石泥化時(shí),浮選指標(biāo)隨Ca2+濃度提高其變化趨勢(shì)同蒙脫石-煤體系相同,但效果相反。當(dāng)Ca2+濃度大于5 mmol/L,非抑制泥化條件下可燃體回收率最高可達(dá)85.59%,精煤灰分為7.01%,相同條件下抑制條件下為80.01%,精煤灰分為7.88%。其原因在于抑制條件下Ca2+明顯降低高嶺石Zeta電位,SEM-EDS分析證實(shí)抑制條件下更多的高嶺石罩蓋在煤顆粒表面。與抑制條件相比,非抑制條件Ca2+降低高嶺石Zeta電位幅度較小。TMBAC抑制粘土礦物泥化時(shí),蒙脫石和高嶺石粒度變化較小,所以抑制和非抑制條件可燃體回收率和精煤灰分差異也較小。
[Abstract]:Clay is the main impurity mineral in coal and also the main ash-forming mineral. Clay minerals in water can be mudded and dispersed into micron grained particles, which have an effect on coal slime flotation. The aim of clay inhibition is to inhibit the swelling and dispersion of clay by chemical adjustment of water solution from the beginning of water-clay contact. This aspect of research has been carried out in regulating the subsidence of coal slurry. The inhibition of clay slime in coal slurry inevitably affects the flotation of coal slime. In view of this, a comparative study on the effects of clay pre-mud inhibition and post-dispersion regulation (non-inhibition) on slime flotation is carried out in order to provide a reference for the practical application of clay silting inhibition. In this paper, the slurry prepared from montmorillonite and kaolinite and pure coal was used as the research object, Ca2 and TMBAC were used as depressants respectively, to explore the effect of inhibiting clay mineral sludge on flotation. The causes were analyzed by means of particle size and Zeta potential and rheological properties of slurry. For montmorillonite coal system, under both Ca2 inhibition and non-inhibition conditions, the concentration of Ca2 increased, the recovery rate of combustible body increased, and the ash content of clean coal increased. Inhibition of montmorillonite mudding resulted in the highest recovery of flotation combustible particles up to 92.60 percent, and the fine coal ash was divided into 5.20, 81.13 and 4.79 in the same conditions. The reason lies in the decrease of fine montmorillonite content in coal slurry and the change of fluid from Newtonian fluid to non-Newtonian fluid, which is beneficial to improve the stability of foam layer. For kaolinite coal system, the change trend of flotation index with increasing Ca2 concentration is the same as that of montmorillonite coal system, but the effect is opposite. When the concentration of Ca2 is more than 5 mmol / L, the recovery rate of combustible body can reach 85.59 under the condition of non-inhibition mudding, the fine coal ash is divided into 7.01 and 80.01 under the same condition, and the refined coal ash is divided into 7.88 and 7.88 respectively. The reason is that Ca2 obviously reduces the Zeta potential of kaolinite and SEM-EDS analysis proves that more kaolinite covers on the coal particle surface under the condition of inhibition. Compared with the inhibition condition, when the uninhibited condition Ca2 reduced the Zeta potential amplitude of kaolinite was smaller, the particle size of montmorillonite and kaolinite changed less when inhibiting clay mineral mudding. Therefore, the difference between the combustible recovery and ash content is also small.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD94
本文編號(hào)：2156583
[Abstract]:Clay is the main impurity mineral in coal and also the main ash-forming mineral. Clay minerals in water can be mudded and dispersed into micron grained particles, which have an effect on coal slime flotation. The aim of clay inhibition is to inhibit the swelling and dispersion of clay by chemical adjustment of water solution from the beginning of water-clay contact. This aspect of research has been carried out in regulating the subsidence of coal slurry. The inhibition of clay slime in coal slurry inevitably affects the flotation of coal slime. In view of this, a comparative study on the effects of clay pre-mud inhibition and post-dispersion regulation (non-inhibition) on slime flotation is carried out in order to provide a reference for the practical application of clay silting inhibition. In this paper, the slurry prepared from montmorillonite and kaolinite and pure coal was used as the research object, Ca2 and TMBAC were used as depressants respectively, to explore the effect of inhibiting clay mineral sludge on flotation. The causes were analyzed by means of particle size and Zeta potential and rheological properties of slurry. For montmorillonite coal system, under both Ca2 inhibition and non-inhibition conditions, the concentration of Ca2 increased, the recovery rate of combustible body increased, and the ash content of clean coal increased. Inhibition of montmorillonite mudding resulted in the highest recovery of flotation combustible particles up to 92.60 percent, and the fine coal ash was divided into 5.20, 81.13 and 4.79 in the same conditions. The reason lies in the decrease of fine montmorillonite content in coal slurry and the change of fluid from Newtonian fluid to non-Newtonian fluid, which is beneficial to improve the stability of foam layer. For kaolinite coal system, the change trend of flotation index with increasing Ca2 concentration is the same as that of montmorillonite coal system, but the effect is opposite. When the concentration of Ca2 is more than 5 mmol / L, the recovery rate of combustible body can reach 85.59 under the condition of non-inhibition mudding, the fine coal ash is divided into 7.01 and 80.01 under the same condition, and the refined coal ash is divided into 7.88 and 7.88 respectively. The reason is that Ca2 obviously reduces the Zeta potential of kaolinite and SEM-EDS analysis proves that more kaolinite covers on the coal particle surface under the condition of inhibition. Compared with the inhibition condition, when the uninhibited condition Ca2 reduced the Zeta potential amplitude of kaolinite was smaller, the particle size of montmorillonite and kaolinite changed less when inhibiting clay mineral mudding. Therefore, the difference between the combustible recovery and ash content is also small.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD94
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