纳米陶瓷球、橡胶磁性衬板在复杂多金属矿塔磨机中的应用研究

Application of Nano Ceramic Ball and Rubber Magnetic Lining Plate in Complex Multi Metal Ore Tower Mill

云南都龙矿区某选矿车间处理的矿石以锌、锡为主,共伴生铜、铁、硫、铟、银等多种元素,矿物共生关系复杂,嵌布粒度粗细不均,选厂采用阶段磨矿、阶段选别工艺流程分选,一段磨矿采用半自磨+球磨SAB流程,二段磨矿采用塔磨机对中间产品进行再磨,实现了多金属矿物的高效回收。塔磨机分别采用轴承钢球和聚氨酯衬板作为磨矿介质和筒体衬板,使用过程中存在磨机运行电耗高、钢球单耗高、空载启动困难、衬板使用寿命短及拆装困难等问题。开展纳米陶瓷球、橡胶磁性衬板在锌粗精矿塔磨中的应用研究后,锌粗精矿再磨粒度-37μm含量达到75%以上,推广应用到锡石次精矿和锡石中矿塔磨再磨系统-74μm含量达到70%以上,磨矿效果得到了明显改善,同时磨机电耗、介质单耗显著降低,橡胶磁性衬板使用寿命是聚氨酯衬板的5倍以上,经济效益可观。

The ore processed of a mineral processing workshop in Dulong mining area of Yunnan Province is mainly zinc and tin,accompanied by copper,iron,sulfur,indium,silver and other elements.The mineral symbiotic relationship is complex and the dissemination size is uneven.The concentrator adopts stage grinding and stage separation process.The first stage grinding is carried out by semi-autogenous grinding+ball milling SAB process,and the second stage grinding is carried out by tower mill to regrinding the inter-mediate products,which realizes the efficient recovery of polymetallic minerals.The tower mill uses bearing steel balls and polyurethane liners as grinding media and cylinder liners respectively.There are problems such as high power consumption of mill operation,high unit consumption of steel balls,difficulty in starting without load,short service life of liners and difficulty in disassembly and assembly.The application of nanoceramic balls and rubber magnetic liners in the tower mill of zinc rough concentrate was studied.The content of-37μm regrinding particle size of zinc rough concentrate reached more than 75%,and the content of-74μm reached more than 70%in the tower mill regrinding system of cassiterite secondary concentrate and cassiterite middling.The grinding effect has been significantly improved.At the same time,the power consumption of the mill is 15%and the unit consumption of the medium is significantly reduced.The service life of the liner is more than 5 times that of the polyurethane liner,and the economic benefit is considerable.