粗煤泥通常粒度介于3~0.5 mm之间，在选煤厂日常生产及运输过程中，每年会产生大量的粗煤泥，而这部分煤泥由于未能有效的加工利用，导致资源严重浪费，以国家能源投资集团神东煤炭洗选中心大柳塔选煤厂二期三系统粗煤泥为研究对象，利用不同规格型号的螺旋分选机探究结构及工艺条件对最终产品分选效果的影响，通过分层分带截留取样探究了不同粒度下螺旋分选机槽面物料的分布特性，为螺旋分选机的应用与发展提供了思路。

在结构参数方面，利用螺旋分选机不同的圈数、螺距并结合各产物特性的变化规律，系统的探究了螺旋分选机结构对分选结果的影响规律，结果显示：较小的螺距有利于中高密度颗粒向槽内缘偏移，使精煤灰分降低。圈数的增多使物料运动相对平稳，精煤产率及灰分均呈上升趋势，由精煤产物粒度组成分析可知，随圈数增加，物料整体向槽外缘偏移，造成精煤产率与灰分上升。

在工艺参数方面，可以发现当精煤排料口宽度增大时，精煤产率升高，灰分增大。流量升高有利于物料在槽面铺展；随着流量升高，精煤产率升高，灰分在流量为0.88 L/s时达到最低。随矿浆浓度增大精煤灰分呈降低趋势，精煤产品中0.5~0.25 mm，0.25~0.125 mm含量升高，且灰分偏低，使精煤整体灰分降低。

在确定分选工艺参数后，对螺旋分选机进行重选工艺评价，绘制了两段分配曲线，得到一段分配曲线δ₅₀

Abstract

Coarse coal slime is a slime with a particle size ranging from 3 to 0.5 mm. In the production and transportation of coal preparation plants, a large amount of coarse slime is wasted every year and cannot be effectively processed.With the coarse coal slime of the second phase and third system of the Daliuta Coal Preparation Plant of the National Energy Investment Group Shendong Coal Washing Center as the research object, using the spiral separators of different specifications and models to explore the effect of the structure and process conditions on the final product separation effect. As a result, the material distribution characteristics of the groove surface of the spiral separator at different particle sizes were explored through layered and band-interception sampling, which provided ideas for the application and development of the spiral separator.

In terms of structural parameters, using the different number of turns and screw pitch of the spiral separator and combining the changing rules of the characteristics of each product, the system has investigated the influence law of the structure of the spiral separator on the separation result. The results show that: a smaller pitch is beneficial to the deviation of medium and high-density particles toward the inner edge of the tank, so that the ash content of clean coal is reduced. With the increase of the number of turns, the movement of the material is relatively stable, and the yield and ash content of clean coal are on the rise. From the analysis of the particle size composition of clean coal, it can be seen that with the increase of the number of turns, the whole material shifts to the outer edge of the groove, making the ash and content of clean coal rise.

In terms of process parameters, it can be found that when the width of the clean coal discharge port increases, the clean coal yield increases and the ash content increases. As the concentration of pulp increases, the ash content of clean coal decreases.. The increase of flow rate is beneficial to the spreading of materials on the surface of the tank; as the flow rate increases, the yield of clean coal increases, and the ash content reaches the minimum when the flow rate is 0.88 L/s. The content of 0.5 to 0.25 mm and 0.25 to 0.125 mm in clean coal products increases, and the low ash content reduces the overall ash content of clean coal

After determining the separation process parameters, the spiral separator was evaluated for the re-selection process, and the two-stage distribution curve was drawn to obtain a one-stage distribution curve δ₅₀