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云南某锡石—硫化矿选矿试验研究
【作者】 孙玉秀；
【导师】 周平；
【作者基本信息】 昆明理工大学 ， 矿物加工工程， 2009， 硕士
【摘要】 我国锡矿资源丰富,锡石硫化矿储量较大,现在开采的也绝大部分都是锡石硫化矿。锡石硫化矿类型多,伴生有用矿物种类多,综合利用价值高,有着较高的经济价值和学术研究价值。本论文主要在云南某地锡石硫化矿的工艺矿物学等性质研究的基础上做不同工艺试验研究和工艺分析研究,考查提高回收率的有效工艺以及探索各工艺提高回收率的有效措施。由于矿石中的锡石多是由锡石单体构成的集合体,集合体粒度也不大。磨矿过程中当集合体解离出来时,也易造成集合体内部锡石单体之间的解离,最终造成解离后的锡石单体粒度极细,其粒度和锡石单体粒度基本一致；矿石中含有多种金属元素,如铜、铅、锌等,有害元素砷。该矿属于难选锡石硫化矿。重选是锡石选矿的主要方法,本文研究以重选为主。首先探索以不同的磨矿粒度进行摇床直接重选和分级入摇床选别试验。由于矿石中大量的硫化物存在和锡石易碎的特点,严重影响了锡石的回收。根据矿石的性质,试验确定采用浮-重联合流程,浮选脱硫可以使锡更多富集于浮选尾矿中,这样硫化物对摇床重选的影响可以减小,但由于锡石与硫化矿的致密共生关系,致使还是有部分锡损失与浮选泡沫中,这部分锡在今后的研究工作中应考虑回收。本研究的主攻方向以浮选脱硫后的尾矿为研究对象。经过对尾矿的阶段磨选和分级入摇床选别后,锡的品位和回收率得到明显提高,研究结果表明：(1)重选是选别该矿的主要方法,但硫化物对重选影响很大；(2)粗磨入选,能拿早拿、能丢早丢,多产品结构。预先脱出硫化矿物是提高锡精矿品位和回收率,简化工艺流程,降低生产成本的有效途径；(3)该锡石硫化矿采用粗磨浮选脱硫一浮选尾矿分级入摇床选别流程指标较好：原矿含锡2.34%,产出锡精矿含锡30.14%,锡回收率39.56%；富中矿含锡4.77%,锡回收率22.74%；贫中矿含锡2.2%,锡回收率20.84%,故三个等级的产品共回收锡83.14%。(4)锡石的细粒嵌布是影响回收率的主要因素,为进一步提高回收率,同时得到高品位锡精矿,后续工作应将重点放在细粒锡石的回收上。
【Abstract】 Zhere are plenty of tin ores in China, Cassiterite-sulfide ore reserves are larger, and now also mostly mined cassiterite-sulfide ore. Cassiterite-sulfide ore of many types and associated minerals useful for many kinds of comprehensive utilization of high-value, has higher economic value and the scholarly research value.In this paper, in a place of Yunnan, mainly work is to do experimental research and process analysis study on cassiterite-sulfide ore based on the different processes:mineralogy and other properties of the process, examined the effective process to improve the recovery rate, as well as to explore the process to improve the recovery rate of effective measures.Because in the ore, the constitution of tinstone aggregate mainly by the tinstone monomer, the aggregate granularity is not big.When in the rubbing process, the aggregate comes out, also easy to create he dissociation in interior between the tinstone aggregate and tinstone monomert, finally creates the tinstone monomer granularity is extremely thin after the dissociation, its granularity and tinstone monomer granularity basic consistent; In the ore includes many kinds of metallic elements, like copper, lead, zinc and so on, harmful element arsenic. This ore belongs the tinstone-sulphide ore which difficultly to choose.The main method dressing of tinstone is the gravity separation, this main study is separates by gravity primarily in this article. The first explores carries on the table to separate by gravity and the graduation directly enters the table classification experiment by different rubbing granularity. Because the ore has massive sulfide existence and tinstone brittle characteristic, influenced tinstone recycling seriously. According to the ore nature, the experiment determined that uses the union flow:floats gravity separation, the flotation process desulphurization may cause the tin to concentrate in the flotation tailings, such sulfide may reduce the fluence to the table gravity separation, but as a result of the compact paragenesis relations in tinstone and the sulphide ore, caused part of tin loss the flotation process froth, this part of tin should consider the recycling in present’s research work.The main attack direction in this research is the tailings after flotation process. Passes through the stage elects and grades enters the table classification in tailings, the tin personal status and the returns-ratio have the distinct enhancement, the findings indicated:(1) Separates by gravity is the main method to classifies this ore, but the sulfide influence the gravity separation is very serious;(2) selected by rough grinding, can take takes early, can lose loses early, multi-product mix. Leaves the sulfide mineral is the efficient path to advance enhances the tin concentrate personal status and the returns-ratio, the simplification technical process, and reduces the production cost;(3)The target of this tinstone-sulphide ore uses the rough grinding flotation process desulphurization-flotation tailings graduation to enter the table classification flow to be good:The crude ore content tin 2.34%, deliver the tin concentrate content tin 30.14%, tin returns-ratio 39.56%; Rich middling content tin 4.77%, tin returns-ratio 22.74%; Poor middling content tin 2.2%, tin returns-ratio 20.84%, therefore three rank’s products recycle tin 83.14% altogether.(4) the fine grain inlays of tinstone is the primary factor affects the returns-ratio, to further raise the returns-ratio, simultaneously obtains the high grade tin concentrate, the following work should place emphasis with the recycling in fine grain tinstone.