某金尾矿二次回收试验研究
发布时间：2018-08-07 19:39
【摘要】：黄金为不可再生资源,随着金矿的不断开采,其资源储量逐年减少。同时,在实际金矿开采及分选过程中,矿山企业排放了大量高价值黄金尾矿并且该部分尾矿没有得到有效的处理利用,造成资源浪费。我国秦岭地区金矿主要为微细粒浸染含金硫化矿,尾矿中金损失严重;主要原因是尾矿中的金以微细粒包裹的形态存在;同时硫化矿的氧化进一步加大了分选的难度。实现该类尾矿中金的有效回收,对实现资源合理利用具有现实意义。本文以河南嵩县某含金黄铁矿浮选尾矿为研究对象,对其进行了粒度分析、化学元素分析、化学物相分析以及矿物组成分析;根据矿石性质并结合现场试验研究基础进行了浮选试验,确定了磨矿细度、浮选时间及浮选浓度,进而研究了药剂制度及浮选工艺流程;最后进行了优化浮选试验研究,通过新型捕收剂BK301和旋流静态微泡浮选柱提高了浮选回收率,实现了资源二次利用的目的。根据矿石工艺矿物学分析结果,采用实验室浮选机对实际矿物进行了浮选试验研究;通过试验探索,最终确定“一粗二精二扫”的工艺流程,其中单因素寻优确定了浮选细度为-0.045mm占90%、浮选矿浆浓度为30%、浮选时间为5min;粗选药剂制度为Na2CO3 200 g/t、水玻璃80 g/t、草酸600 g/t、硫酸铜20 g/t、异戊黄药75 g/t、丁铵黑药15 g/t、2#油15 g/t;精选药剂制度为:一段水玻璃用量20 g/t、异戊黄药20 g/t、丁铵黑药15 g/t;二段水玻璃用量20 g/t;扫选药剂制度为:一段异戊黄药20 g/t、丁铵黑药10 g/t;二段异戊黄药20 g/t、丁铵黑药10 g/t。在“一粗二精二扫”闭路条件下,最终获得了精矿品位8.68 g/t,回收率67.44%的浮选指标。通过新型捕收剂BK301以及旋流静态微泡浮选柱完成了一次粗选试验研究,获得粗精矿品位为1.72 g/t,回收率76.53%。为进一步提高浮选指标,进行了“浮选机二段精选+浮选柱一段粗选一段扫选”浮选优化开路试验,取得了最终精矿的品位为9.45 g/t,回收率为51.01%的浮选指标,同比浮选机“一粗二精二扫”流程,精矿品位提高0.50 g/t左右,回收率提高4%左右。试验为该地区含金黄铁矿尾矿中金的二次回收提供了研究依据。
[Abstract]:Gold is a non-renewable resource. With the exploitation of gold ore, its reserves decrease year by year. At the same time, in the actual gold mining and separation process, the mining enterprises discharge a large number of high-value gold tailings and this part of the tailings have not been effectively treated and utilized, resulting in a waste of resources. Gold deposits in Qinling area of China are mainly fine-grained gold-bearing sulphide ores, and the loss of gold in tailings is serious, the main reason is that the gold in tailings exists in the form of fine particles, and the oxidation of sulphide ores further increases the difficulty of separation. It is of practical significance to realize the effective recovery of gold from this kind of tailings. In this paper, the flotation tailings of a gold-bearing pyrite in Songxian County, Henan Province are studied. The particle size analysis, chemical element analysis, chemical phase analysis and mineral composition analysis are carried out. According to the properties of ore and the basis of field experiment, the flotation test was carried out, the grinding fineness, flotation time and flotation concentration were determined, and then the reagent system and flotation process were studied. The recovery rate of flotation was improved by new collector BK301 and cyclone static microbubble flotation column, and the purpose of secondary utilization of resources was realized. According to the results of ore process mineralogy analysis, the flotation experiments of real minerals were carried out by using a laboratory flotation machine, and the technological process of "one coarse, two fine and two sweep" was finally determined by means of test and exploration. Single factor optimization determined that the fineness of flotation was -0.045 mm accounting for 90%, the concentration of flotation pulp was 30 and the flotation time was 5 mins; the roughing reagent system was Na2CO3 200g / t, sodium silicate 80 g / t, oxalic acid 600g / t, copper sulfate 20 g / t, isopentyl xanthate 75% g / t, ammonium butylammonium 15 g / t oil The dosage of sodium silicate 20 g / t, isoamyl xanthate 20 g / t, ammonium butyrate 15 g / t; second stage sodium 20 g / t; scavenging pharmaceutical system 20 g / t, ammonium butyrate 10 g / t; isoamyl xanthate 20 g / t, ammonium butyrate 10 g / t; second stage isopentyl xanthate 20 g / t, ammonium butyrate 10 g / t. Under the closed circuit condition of "one coarse, two fine and two sweep", the flotation index with concentrate grade of 8.68 g / t and recovery of 67.44% was obtained. By using a new collector BK301 and a hydrocyclone static microbubble flotation column, a rough concentrate grade of 1.72 g / t and a recovery of 76.53% were obtained. In order to further improve the flotation index, the flotation optimization open circuit test of "flotation column one stage coarse cleaning and one stage cleaning" was carried out. The final concentrate grade was 9.45 g / t and the recovery rate was 51.01%. Compared with the flotation machine, the concentrate grade is increased by 0.50 g / t and the recovery rate is increased by about 4%. The experiment provides the basis for the secondary recovery of gold from the gold bearing pyrite tailings in this area.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD926.4
本文编号：2171142
[Abstract]:Gold is a non-renewable resource. With the exploitation of gold ore, its reserves decrease year by year. At the same time, in the actual gold mining and separation process, the mining enterprises discharge a large number of high-value gold tailings and this part of the tailings have not been effectively treated and utilized, resulting in a waste of resources. Gold deposits in Qinling area of China are mainly fine-grained gold-bearing sulphide ores, and the loss of gold in tailings is serious, the main reason is that the gold in tailings exists in the form of fine particles, and the oxidation of sulphide ores further increases the difficulty of separation. It is of practical significance to realize the effective recovery of gold from this kind of tailings. In this paper, the flotation tailings of a gold-bearing pyrite in Songxian County, Henan Province are studied. The particle size analysis, chemical element analysis, chemical phase analysis and mineral composition analysis are carried out. According to the properties of ore and the basis of field experiment, the flotation test was carried out, the grinding fineness, flotation time and flotation concentration were determined, and then the reagent system and flotation process were studied. The recovery rate of flotation was improved by new collector BK301 and cyclone static microbubble flotation column, and the purpose of secondary utilization of resources was realized. According to the results of ore process mineralogy analysis, the flotation experiments of real minerals were carried out by using a laboratory flotation machine, and the technological process of "one coarse, two fine and two sweep" was finally determined by means of test and exploration. Single factor optimization determined that the fineness of flotation was -0.045 mm accounting for 90%, the concentration of flotation pulp was 30 and the flotation time was 5 mins; the roughing reagent system was Na2CO3 200g / t, sodium silicate 80 g / t, oxalic acid 600g / t, copper sulfate 20 g / t, isopentyl xanthate 75% g / t, ammonium butylammonium 15 g / t oil The dosage of sodium silicate 20 g / t, isoamyl xanthate 20 g / t, ammonium butyrate 15 g / t; second stage sodium 20 g / t; scavenging pharmaceutical system 20 g / t, ammonium butyrate 10 g / t; isoamyl xanthate 20 g / t, ammonium butyrate 10 g / t; second stage isopentyl xanthate 20 g / t, ammonium butyrate 10 g / t. Under the closed circuit condition of "one coarse, two fine and two sweep", the flotation index with concentrate grade of 8.68 g / t and recovery of 67.44% was obtained. By using a new collector BK301 and a hydrocyclone static microbubble flotation column, a rough concentrate grade of 1.72 g / t and a recovery of 76.53% were obtained. In order to further improve the flotation index, the flotation optimization open circuit test of "flotation column one stage coarse cleaning and one stage cleaning" was carried out. The final concentrate grade was 9.45 g / t and the recovery rate was 51.01%. Compared with the flotation machine, the concentrate grade is increased by 0.50 g / t and the recovery rate is increased by about 4%. The experiment provides the basis for the secondary recovery of gold from the gold bearing pyrite tailings in this area.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD926.4
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