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磨矿分级作业可以分为哪几个系列

In 2004 to early 2005 Dagushan Concentrator of magnetic separation workshop process after the transformation, a grinding ore grading series a total of 6, the second section grinding ore grading series a total of 4, the first and second section grinding ore grading equipment for 3 to 2 configuration, the series of a grinding to a diameter of 36 mm x 60 mm overflow type ball mill and 1 500 mm X8 grading cyclone to form a closed-circuit grinding, the second section grinding ore grading equipment also used the same types of ball mill and classifying cyclone, a magnetic separation equipment with 1200 mm diameter x 3200 mm permanent magnetic separator. The fire of Gushan concentrator workshop with soo mm X8 selected reef hydrocyclone field. The process flow of grinding classification and its closely related magnetic separation operation. Through experimental research and production practice, the plant drew a conclusion, that is: 1 hydrocyclone appropriate structure parameters and process conditions is sinking sand mouth diameter 44 mM and diameter of overflow pipe 105 115 mm, to mine pipe 80 - 65 mm, to the ore concentration (40 2%), to the mine pressure of 0.12 MPa, handling capacity of the mill machine 65 to 70 L / (H), sand dryer overflow fineness 70clo - 0.074 mm. II hydrocyclone for classification is helpful to the destruction of the rough concentrate of magnetic agglomeration and poor intergrowth, is conducive to enhance the grade of concentrate. Two classification flow test index comparison results see table 10 - 3.4. The hydrocyclone for pre examination grading, overflow in poor intergrowth more, these poor intergrowth in magnetic separators is prone to concentrate, affect the concentrate grade.

Hydraulic cyclone sinking sand - 0 074 mm content more than 10 percentage points lower than the spiral classifier, water slag drying machine greatly reduces the "ground" phenomenon, not only to improve the grinding efficiency, it is more beneficial to reduce the loss of metal, improve metal recovery rate. The of the second paragraph of a closed-circuit conventional crushing and screening and a ball mill, spiral classifier classification and closed-circuit and wet autogenous grinding a hydrocyclone classification scheme comparison, the wet autogenous grinding in a hydrocyclone classification scheme design and build factories. Two processes. Two schemes comparison results, ore processing capacity for the same conditions, the plant area of less M2 1545.8, equipment quality less t 95.619, electrical equipment installed capacity less 98 kW, working at least 277.2 kW, the annual electricity consumption less 153. 68 million kW.h. production workers less than 21 people. With the use of the original design of the comprehensive price index calculated compared to the wet autogenous grinding with the original design, infrastructure investment saving. 08 million yuan, operating costs of electricity and wages for production workers, festival, 110 14 million yuan. See table 3.4 - 9. Xinfeng iron ore dressing plant wet self grinder and hydrocyclone classification and closed-circuit processes, application in production actual in domestic is the first one to 2005 in March 20 officially direct production show that for grinding and classification to create a new way.

2004年至2005年初大孤山选矿厂磁选车间流程改造后,一段磨矿分级作业共6个系列,二段磨矿分级作业共4个系列,一、二段磨矿分级设备为3对2配置,各系列一段磨矿为1台φ 3600 mm×6000 mm溢流型球磨机与1台 500 mm x8分级旋流器组成闭路磨矿,二段磨矿分级设备也采用同样型号球磨机与分级旋流器,一次磁选设备采用φ1200 mm×3200 mm永磁磁选机。火孤山选矿厂礁选车间φsoo mm x8水力旋流器使用现场。磨矿分级作业及与其密切相关的一次磁选作业的工艺流程。 该厂通过试验研究和生产实践得出:①水力旋流器适宜的结构参数和工艺条件是沉砂嘴直径44 mm,溢流管直径105一115 mm,给矿管80—65 mm,给矿浓度(40 2)%,给矿压力0.12 MPa,球磨机处理量65 ~70 L/(台.h),海沙烘干机溢流细度70clo -0.074 mm。②水力旋流器作检查分级用较有利于破坏粗精矿的磁团聚和贫连生体,较有利于提高精矿品位。两种分级流程试验指标对比结果见表3.4 - 10。③水力旋流器作预先检查分级使用,溢流中贫连生体较多,这些贫连生体在磁选中很容易进入精矿,影响精矿品位。
水力旋流器组沉砂中-0 074 mm含量比螺旋分级机低10个百分点以上,水渣烘干机较大程度地减少了“过磨”现象,不但提高了磨机效率,更有利于减少金属流失,提高金属回收率。 经对二段一闭路常规破碎筛分和一段球磨与螺旋分级机闭路分级和湿式自磨一水力旋流器分级方案比较,采用湿式自磨一水力旋流器分级方案进行设计建厂。两种流程分别。两个方案比较结果,在原矿处理能力相同的条件下,后者厂房面积少1545.8 m2,设备质量少95.619 t,用电设备安装容量少98 kW,工作容最少277.2 kW,年总耗电量少153. 68万kW.h.生产工人少21人。同用原设计的综合价格指标,计算出湿式自磨方案与原设计相比,基建投资节省297. 08万元,经营费中的电费和生产工人工资,年节省110 14万元.见表3.4 -9。鑫丰铁矿选矿厂湿式自磨机与水力旋流器闭路分级流程,应用于生产实际在国内尚属首家.2005年3月20日正式顺行投产表明,将为磨矿分级开创一条新的途径。

 
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