Mechanical Activation of Alkaline Leaching ofScheelite Concentrate

１ＩｎｔｒｏｄｕｃｔｉｏｎＣｈｉｎａｉｓｗｅｌｋｎｏｗｎａｓａｔｕｎｇｓｔｅｎｃａｐｉｔａｌｏｆｔｈｅｗｏｒｌｄｄｕｅｔｏｉｔｓｔｕｎｇｓｔｅｎｒｅｓｅｒｖｅｏｆｍｏｒｅｔｈａｎａｈａｌｆｏｆｔｈｅｔｏｔａｌｉｎａｌｏｖｅｒｔｈｅｗｏｒｌｄ．Ｉｎ...     

A decomposing technique for scheelite concentrate and low-grade scheelite concentrate

The effect of different decomposition conditions on tungsten recovery for scheelite concentrate has been examined. The results show that tungsten recovery can be more than 98% under decomposing conditions as follows: the amount of caustic soda is 2.2 and 3.2 times of theoretical respectively, ratio of water and ore is 0.7-0.8, temperature is 160℃, and preservation time is 2.0 h for scheelite concentrate (63.21% WO3) and low grade scheelite concentrate (55.17% WO3).     

Improvement of flotation behavior of Mengzi lead-silver-zinc ore by pulp potential control flotation

The electrochemical behavior of Mengzi lead-silver-zinc ore flotation system was studied. Based on the electrochemical characteristics of sulfide mineral flotation system, a stage potential control flotation was developed with the main parameters of pulp potential（φp）, pH value and collector dosage. Using N,N＇ diphenylamino-dithiolphosphoric acid（NNDDC） as a collector, which has good selectivity for galena flotation at pH 8.8 and pulp potential 330 mV, DDTC is used as secondary collector to improve both the grade and recovery of Pb and Ag. The pulp potential values significantly influence the floatability of practical minerals and single minerals when using NNDDC as the collector. The flotation recovery of galena reaches 85% at about 0.3 V and pH8.8. With the usage of pulp potential control during grinding and flotation, the new pulp electrochemical technology for Mengzi lead-silver-zinc ore flotation was developed. The results show that the grades of Pb and Ag of galena concentrate are 55% and 1 800 g/t, respectively, while the recoveries of Pb and Ag are 86.5% and 65%, respectively, the grade of Zn of marmatite concentrate is 42.5%, and the recovery of Zn is 91.25%.     

高银铅铜混合精矿选矿试验研究

某高银铅铜混合精矿为铜铅混浮产品,表面受到浮选药剂严重污染,导致铜矿物与铅矿物可浮性差异微小,给铜铅分离带来非常不利的影响,其银品位达到4208.0 g/t,铅品位43.28%,铜品位3.39%,98.80%的银赋存于方铅矿。采用“活性炭脱药-抑铅浮铜”工艺流程处理,环保高效的方铅矿抑制剂GYC,高效铜捕收剂SAC,全流程试验获得银品位4839.2 g/t,银回收率97.36%,铅品位50.05%,铅回收率97.90%的银铅精矿;铜品位20.16%,铜回收率91.23%,银品位724.6 g/t,银回收率2.64%的铜精矿,实现了混合精矿中银铅与铜的高效回收。     

Recovery of molybdenum and copper from porphyry ore via iso-flotability flotation

A copper–molybdenum iso-flotability flotation process has been developed to efficiently improve the recovery of molybdenite from Duobaoshan porphyry Cu–Mo ores. The effects of flotation approach, type of collector, feed particle size distribution, rougher pH value and reagent dosage on the recovery of molybdenite were evaluated systematically. The results suggest that compared with kerosene and diesel oil, transformer oil has stronger dispersion capability in water media and better flotation selectivity for molybdenite, providing a higher molybdenum recovery under low reagent dosage. Moreover, compared with bulk flotation approach, the iso-flotability flotation approach using transformer oil as a collector can obtain superior Mo recovery (90.77%) and grade (0.80%) in the cleaner concentrate, and increase the Mo recovery and grade by over 18% and 5% in the final Mo concentrate, respectively. The results of commercial flotation further indicate that the iso-flotability flotation approach is a rational and effective route to beneficiate the porphyry Cu–Mo ores.     

贵州某金矿浮选条件的响应曲面法优化研究

采用响应曲面法(RSM)对贵州某金矿浮选过程中的磨矿细度、pH值、捕收剂用量对金品位和回收率的影响进行了研究.结果表明磨矿细度对金品位和回收率的影响最大,为显著影响因素.根据预测的结果,采用磨矿细度(-200目占比)70％、pH值8.44、捕收剂用量144 g/t的最优条件,以"一粗两精一扫"的闭路试验流程,最后得到了...     

Wolframite Conversion in Treating a Mixed Wolframite–Scheelite Concentrate by Sulfuric Acid

Complete wolframite conversion in sulfuric acid is significant for expanding the applicability of the sulfuric acid method for producing ammonium paratungstate. In this paper, the conversion of wolframite in treating a mixed wolframite–scheelite concentrate by sulfuric acid was studied systematically. The results show that the conversion of wolframite in sulfuric acid is more difficult than that of scheelite, requiring rigorous reaction conditions. A solid H₂WO₄ layer forms on the surfaces of the wolframite particles and becomes denser with increasing H₂SO₄ concentration, thus hindering the conversion. Furthermore, the difficulty in wolframite conversion can be mainly attributed to the accumulation of Fe²⁺ (and/or Mn²⁺) in the H₂SO₄ solution, which can be solved by reducing Fe²⁺ (and/or Mn²⁺) concentration through oxidization and/or a two-stage process. Additionally, the solid converted product of the mixed wolframite–scheelite concentrate has an excellent leachability of tungsten in an aqueous ammonium carbonate solution at ambient temperature, with approximately 99% WO₃ recovery. This work presents a route for manufacturing ammonium paratungstate by treating the mixed concentrate in sulfuric acid followed by leaching in ammonium carbonate solution.     

Flotation evaluation and adsorption mechanism of medialan collector to wolframite

Medialan has preferable flotation performance to wolframite,under the conditions of the best flotation pH value 7.0 and low dosage,wolframite recovery is up to80%.Medialan shows poor flotation performance to quartz,but better to fluorite and calcite.However,fluorite and calcite are inhibited in a certain degree by adding medialan mixed with sodium silicate.Adsorption mechanism of medialan collector on wolfram surface was also studied by using infrared(IR)radiation spectrum,adsorption volume,and zeta potential.The results show that medialan can adsorb on wolfram surface in the form of chemistry adsorption,and as medialan collector dosage changes,change law of adsorption volume is similar with that of wolfram pure mineral flotation.Zeta potential results prove that zeta potential of wolfram surface moves negatively after adsorbing medialan collector.     

捕收剂RL在铝土矿浮选中的应用

研究了一水硬铝石、高岭石及叶腊石等单矿物在RL为捕收剂时的浮选特性,考察了各种调整剂、难免离子对浮选体系的影响,在此基础上进行了人工混合矿和实际矿石的分离试验。实际矿石闭路试验结果表明：采用RL为捕收剂,碳酸钠和六偏磷酸钠为调整剂,精矿中Al2O3和SiO2的品位分别为70．74％和6．37％（精矿铝硅比为11．11）,Al2O3的回收率达到90．52％。     

云南某含银铜铅混合精矿分离试验研究

云南某铜铅混合精矿含Cu 8.14%、Pb 38.57%、Ag 251.62 g/t，对其进行浮选试验研究铜铅的分离。通过条件试验，确定在磨矿细度为-200目含量为93.85%的情况下，抑制剂CMC+亚硫酸钠用量选择1000 g/t，捕收剂Z-200用量选择10 g/t。采用“抑铅浮铜”一粗三精一扫的闭路试验流程，获得铜品位24.73%、回收率87.24%、含铅品位6.23%的铜精矿；铅品位62.71%、回收率84.48%，含铜0.86%的铅精矿。银在铜铅精矿中进一步富集的总回收率为73.04%，实现了该铜铅混合精矿的分离及银的进一步富集。     

调整碱压煮工艺参数 提高复杂钨矿分解率

随着黑矿资源的枯竭,精矿中复杂矿的比率可增至10%以上,所谓复杂矿就是指按一般黑钨精矿碱压煮工艺分解,其分解率在(94～95)%的钨矿。通过调整工艺参数,要使疑难矿的分解率提高(4～5)%,具有明显的经济效益和社会效益。     

新型阳离子捕收剂在极难选高硅型铝土矿反浮选中的应用

详细研究了一水硬铝石和脉石矿物在BS-3为捕收剂时的浮选特性,考察了调整剂在矿浆中对浮选的影响,并在此基础上进行了人工配矿和实际矿石的浮选分离试验研究。实际矿石试验结果为:精矿中Al2O3和SiO2的品位分别为64.55%和6.28%,精矿A/S为10.28,Al2O3的回收率高达83.41%。     

山东某含金硫铁矿强化浮选回收试验研究

山东某含金硫铁矿原矿金品位为3.06 g/t、含硫量为2.65%。工艺矿物学研究表明,金主要以自然金等独立金矿物形式存在,其次以黄铁矿为载体,少量以磁黄铁矿为载体。采用快速浮选和常规浮选组合的工艺流程,以硫酸铜做活化剂,MA-1做捕收剂,HX-609做起泡剂,分别获得了金品位为34 g/t、32 g/t的快速浮选精矿和常规浮选精矿,金总回收率达到90%以上。     

锌浸出渣中银浮选工艺优化工业试验

基于前期的实验室研究,对河南某锌冶炼厂低酸浸出渣浮选回收银浮选优化工艺进行了工业试验。采用原生产流程,调整优化生产现场矿浆浓度(保持在30%以上)和药剂制度(采用Z-200作辅助捕收剂,活性炭为载体,不再添加黄药)、工艺设备及其工作参数后进行了工业试验。结果表明,工艺优化后,银精矿品位由3000 g/t提高至6740.4 g/t,银回收率由60%~64%提高到73.17%;精矿产率降低到原工艺的三分之一,减少了银精矿所带走的锌损失;精矿中金品位由1.5 g/t提高到5.3 g/t以上,提高了金的回收率。     

TXD as selective depressand of fluorite and calcite

ＴＸＤＡＳＳＥＬＥＣＴＩＶＥＤＥＰＲＥＳＳＡＮＴＯＦＦＬＵＯＲＩＴＥＡＮＤＣＡＬＣＩＴＥＴｉａｎ，Ｘｕｅｄａ；Ｚｈｕ，Ｊｉａｎｇｕａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭｉｎｅｒａｌＰｒｏｃｅｓｓｉｎｇＥｎｇｉｎｅｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉ...     

铜铅多金属硫化矿中伴生金的强化回收实验研究

采用铜铅混选富集-抑铜浮铅浮选分离的工艺,对某铜铅多金属硫化矿中的伴生金进行强化回收研究。在铜铅混选阶段,弱碱性条件(pH=9)下,用Z-200(30 g/t)做捕收剂,金在铜铅混合精矿中有效富集;在铜铅分离阶段,以硫化钠(4000 g/t)预先脱药,用乙硫氮(30 g/t)浮选铅矿物,金在铜精矿中进一步富集。工艺闭路实验获得含铜18.69%、含金42.70 g/t的含金铜精矿,铜和金的回收率分别达到92.58%和56.84%;还同时获得含铅61.45%的铅精矿。可实现铜铅多金属硫化矿中伴生金的强化回收。     

石煤提钒的浮选工艺及吸附机理

针对传统石煤提钒工艺中钒回收率低、环境污染严重等问题,在工艺矿物学研究的基础上,采用浮选的方法对含钒石煤矿进行条件实验和闭路实验,设计出提钒浮选流程,并利用分子动力学模拟研究捕收剂分子在矿物解理面的吸附过程。结果表明:石煤中主要含钒矿物为钒云母,主要的脉石矿物为石英;通过闭路浮选实验,得到了五氧化二钒品位为3.20%(质量分数)、回收率为74.50%的钒精矿;捕收剂分子容易在钒云母(001)面发生吸附,而在石英(001)面几乎不吸附,从而实现了石煤中钒云母和石英的浮选分离。     

新型季铵盐捕收剂对白钨矿和方解石的常温浮选分离

采用二辛基二甲基溴化铵(DDAB)作捕收剂,研究白钨矿、方解石单矿物的浮选行为和其人工混合矿的浮选分离以及柿竹园白钨矿的常温精选。结果表明:在单矿物和人工混合矿的浮选中,DDAB在对白钨矿的捕收能力和选择性上均显著优于油酸,其最佳的浮选pH值范围为8~10;在对柿竹园白钨矿的常温精选中,DDAB取得了开路最终浮选精矿WO3品位51.63%,回收率43.83%的良好指标。这些都证明DDAB是一种新型高效的白钨矿常温精选捕收剂。通过对白钨矿和方解石的表面动电位分析、DDAB的结构分析以及DDAB与白钨矿作用的红外光谱分析和量子化学分析,推断DDAB主要依靠静电力与白钨矿表面作用。     

Double reverse flotation process of collophanite and regulating froth action

A new double reverse flotation process was used to beneficiate the Yichang region collophanite of Hubei Province, China. Its final concentrate yield is 67.37%, P2O5 grade is 32.17%, P2O5 recovery is 87.80%, and the main impurities MgO, Fe203 and Al2O3 are 0.95%, 1.04%, 1.36%, respectively. The difficult problem was successfully solved that plentiful froths are bought by the cationic collector reverse flotation in collophanite beneficiation by adding inorganic froth regulator CA to the pulp. The defrothing mechanism was studied through mensurating surface tension and Zeta potential of the pulp after adding CA. It is found that the changing of surface tension and hoisting of Zeta potential may be the main reasons that froths become friable and break up.     

吉林某金矿选矿工艺对比实验研究

对吉林某金矿进行了重选、无毒浸出和浮选3种选矿工艺对比实验,研究了磨矿细度、药剂用量、矿浆浓度等因素对选矿效率的影响.结果表明,无毒浸出工艺回收率为76.13％,重选工艺基本无优先选别作用;采用浮选工艺,在磨矿细度为-0.074 mm含量为90.52％,捕收剂异戊基黄药与丁铵黑药的药剂用量均为60 g/t,矿浆浓度为4...