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1、i2.0Mt/a 矿井型选煤厂初步设计摘 要本次设计为 200 万吨的大型矿井型选煤厂。入洗的原煤为西曲矿原煤 和马兰矿原煤按 5：5 的比例混合后的煤，原煤的灰分为 22.49% ，属于 中等可选煤。设计任务要求精煤产品灰分小于 9%,水分小于 10%.精煤产品 作为炼焦煤，中煤与煤泥相混作为代销，矸石外运。 因大于 50mm 矸石只占入选原煤的 4.46%，入厂原煤的含矸量为中矸， 所以不考虑选前排矸作业，只需进行破碎。原煤中的煤泥含量较少，故不 需要预先脱泥。采用两台直径为 1.0m 的无压三产品重介旋流器进行分选 后产品分别进入精煤、中煤、矸石脱介筛。筛下由溜槽等管道收集合格介 质和稀
2、介质到相应的桶内。为了提高分选密度，并且减少煤泥量，精煤筛 下的合格介质中有一少部分需要分流。由于粗煤泥含量极少，且灰分不高， 故不考虑对粗煤泥使用分选设备，只进行分级脱水，然后加入各产品中。 煤泥采用直接浮选工艺，使用加压过滤机来处理浮选精煤，而浮选尾煤则 在浓缩后用快开压滤机进行处理。关键词：选煤厂,旋流器,煤泥,浮选iiTHE DESIGN OF 2.0MT/A PITHED COAL PREPARATION PLANTABSTRACTThe design is for the large-scale shaft mode coal preparation plant of 2.0 mi
3、llion.The raw coal to be washed are the Xiqu raw coal and Malan raw coal which are mixed in the proportion of five：five. The ash content of the raw coal is 22.49% ,which makes the coal middling to wash.The task of the design is to make the ash content of the washed coal be less than 9%,the moisture
4、content be less than 10%.And the washed coal will act as coking coal, middlings and sludge will be mixed and sold seperately,and the reject will be carried away. For the reject whose particle sizes are larger than fifty millimeters occupy the feeds 4.46% , which is middling ,we have no need to do an
5、ything to exclude them, just crashing before washing.The sludge content of the raw coal is not too much,so slimeseparation ahead isnt needed.Separated by the two no-pressur media cyclones whose diameter is 1.0 meters,the coal will be carried to the washed coal 、the middlings and the rejects sculping
6、 screens separately.The materials that below the mesh screens will acess to corresponding qualified media and sparse media casks.In order to increase the separation density and decrease the sludge content,a part of the qualified media form the washed coal sculping screen should be distributed. Conte
7、nt is extremely low as a result of coarse coal and ash is not high, it does not consider the use of crude coal sorting equipment, only graded dehydration, and then adding the products.During the direct floatation craft, the flotation concertrates will be dealt by a dissepiment press filter,while the
8、 flotation tailings will be treated in the pressure filtration department.KEY WORDS：coal preparation plant, cyclone, sludge, floatationI目 录前 言.1第一章 设计概要.21.1 项目背景和历史 .21.2 可行性研究概要 .21.3 产品用户和拟建规模 .21.3.1 市场预测.21.3.2 生产能力.3第二章 煤源及煤质特征.42.1 煤源概况 .42.2 煤质特征 .42.3 煤的可选性 .52.3.1 煤质资料依据.52.3.2 可选性曲线.182.3
9、.3 筛分资料分析.182.3.4 原煤入选方式的确定混合与分组.192.3.5 选煤流程.19第三章 选煤工艺.203.1 选煤方法的确定 .203.1.1 跳汰分选指标计算.203.1.2 重介（三产品）分选指标计算.233.1.3 选煤方法确定.273.2 流程的简述及特点 .273.2.1 原煤准备.333.2.2 主选部分.333.2.3 流程特点如下.343.3 工艺流程图 .353.4 工艺流程的计算 .363.4.1 准备作业的计算.363.4.2 分选作业的计算.37第四章 工艺设备的选型与计算.55II4.1 准备车间的选型与计算 .554.2 分选设备选型与计算 .564.3 浮选部分的设备选型 .574.4 煤及煤泥脱水设备的选型与计算 .584.5 介质浓缩设备 .59第五章 工艺布置.605.1 地面工艺总布置 .605.2 主厂房工艺布置 .615.3 场地运输 .61第六章 生产辅助设施.626.1 设施概况 .626.2 生产技术检查 .626.3 给排水 .
