硫精矿中有价金属铜金银的综合回收利用实验

这是一篇矿物加工工程领域的论文。对某含铜金银硫精矿进行了选矿综合回收实验研究,实验结果表明,采用异丁基黄药+乙硫氮组合捕收剂,氧化钙做抑制剂,2^(#)油做起泡剂,经过一次粗选-三次精选-二次扫选的浮选工艺流程,最终可得到铜品位为16.66%、回收率为86.96%,金品位为278.95 g/t,回收率为75.56%;银品位为1848.74 g/t,回收率为78.55%的精矿产品,有效地实现了硫精矿中铜的综合回收,同时使金、银很好地富集在铜精矿中,便于回收利用,选矿指标理想。

锡石多金属硫化矿矿石磨矿特性研究

针对过磨与欠磨的问题以及磨矿方式和入料粒级对矿石磨矿效果的影响。以锡石多金属硫化矿为研究对象,基于批次磨矿试验,通过改变磨矿方式、入料粒级、磨矿时间等磨矿影响因素,探索磨矿产物粒度分布规律和磨矿行为特性。结果表明,研磨磨矿是一个低能磨矿过程,矿石所受作用力小,易发生欠磨现象。抛落磨矿和冲击磨矿是一个高能磨矿过程,矿石所受作用力大,破碎更加充分,易发生过磨现象。在研磨磨矿下,磨矿技术效率E和磨矿产物t_(10)随磨矿时间变化幅度稳定,产物粒度分布比较均匀;在抛落磨矿和冲击磨矿下,磨矿技术效率E和磨矿产物t_(10)随磨矿时间变化明显,且变化幅度大,总体上两种磨矿指标均大于研磨磨矿。从入料粒级看,矿石的磨矿行为与入料粒级的关系较为复杂,没有明显的规律。研究结果将为后续研究抛落状态下研磨和冲击两种作用力的强弱及其相互影响提供理论依据。

Electronic structure and properties of FeS_2 with the space groups of Pa3 and P1

The electronic structure and properties of FeS2 with the space groups of Pa3 and P1 were studied by the density functional theory. The generalized-gradient approximation exchange-correlation functional was used in conjunction with a plane wave-ultrasoft pseudopotential representation. Calculation results show that differences are observed in electronic structures and properties between Pa3 and P1 crystals. The band gap and energy loss of P1 are smaller than those of Pa3 crystal, while the dielectric constant, conductivity, refractive index, extinction coefficient, and intensity of optical absorption of P1 are larger than those of Pa3. These behaviors are attributed to the differences in symmetry, atomic arrangement, and Mulliken bond population of each unit for Pa3 and P1 crystals.

Study on the sedimentation capability of bauxite flotation concentrate

The sedimentation behaviors of bauxite flotation concentrates were investigated at different pH values and floceulant dosages. The effects of three types of flocculants （ cationic, anionic and non-ionic polyacrylamide floceulants） as well as the molecular weight of anionic flocculants on the sedimentation of concentrate were studied. It is shown from the experimental results that at the pH 7.0, best sedimentation capability is reached when anionic polyacrylamide flocculant （molecular weight 14 million） is added and the optimal dosage is 30 g/t.

Activation mechanism of ammonium oxalate with pyrite in the lime system and its response to flotation separation of pyrite from arsenopyrite

The activation properties of ammonium oxalate on the flotation of pyrite and arsenopyrite in the lime system were studied in this work.Single mineral flotation tests showed that the ammonium oxalate strongly activated pyrite in high alkalinity and high Ca^(2+)system,whereas arsenopyrite was almost unaffected.In mineral mixtures tests,the recovery difference between pyrite and arsenopyrite after adding ammonium oxalate is more than 85%.After ammonium oxalate and ethyl xanthate treatment,the hydrophobicity of pyrite increased significantly,and the contact angle increased from 66.62°to 75.15°and then to 81.21°.After ammonium oxalate treatment,the amount of ethyl xanthate adsorption on the pyrite surface significantly increased and was much greater than that on the arsenopyrite surface.Zeta potential measurements showed that after activation by ammonium oxalate,there was a shift in the zeta potential of pyrite to more negative values by adding xanthate.X-ray photoelectron spectroscopy test showed that after ammonium oxalate treatment,the O 1s content on the surface of pyrite decreased from 44.03%to 26.18%,and the S 2p content increased from 14.01%to 27.26%,which confirmed that the ammonium oxalatetreated pyrite surface was more hydrophobic than the untreated surface.Therefore,ammonium oxalate may be used as a selective activator of pyrite in the lime system,which achieves an efficient flotation separation of S-As sulfide ores under high alkalinity and high Ca2+concentration conditions.

ITO废靶回收废水制取氯化铝的研究

通过利用铝片从ITO靶材酸性废水中分离铟、锡并对废水资源化利用进行研究,确定氯化铝结晶最佳的工艺参数和条件。结果表明,在废水浓缩倍数为2.0、加入铝的质量为理论值的200%、调节溶液pH为1.0的条件下产品质量最优,重结晶产品用稀盐酸洗涤后产品纯度达到99.5%,达到优等品级别。通过本文研究,成功实现富集回收铟、锡的同时得到副产品高纯结晶氯化铝,并且实现了盐酸的循环利用,在节约成本的同时解决工业废水的问题。

钼铅分离中方铅矿抑制剂的研究进展

在钼铅复杂多金属硫化矿的浮选分离中,由于辉钼矿和方铅矿的嵌布关系复杂,且可浮性相近,因此钼铅分离历来是一个难题。解决钼铅分离问题的关键在于抑制剂的选择。从无机抑制剂和有机抑制剂2个方面介绍了钼铅分离中方铅矿抑制剂及其抑制作用机理。无机抑制剂主要为重铬酸钾、硫化钠和磷诺克斯,它们毒性大、对环境污染也大。有机抑制剂中,小分子抑制剂选择性好,但抑制效果较差;大分子抑制剂抑制效果强,但是选择性差,目前很少应用在钼铅分离中。无机和有机抑制剂的抑制作用机理都是分子中的亲固基团和方铅矿结合,亲水基团增加方铅矿表面的亲水性。随着绿色矿山建设的深入,绿色、高效方铅矿抑制剂的研发将成为钼铅分离领域研究的重要内容。

改性壳聚糖对硫酸废水中氯离子的吸附性能研究

采用了化学配位的方法 ,以两种有机酸、硫酸汞和壳聚糖为原料制备出Hg^(2+)改性壳聚糖(Hg-CTS)新型高效吸附剂,通过FT-IR、XRD、XPS、SEM等技术对吸附剂的物化特性和微观结构进行分析,对所制备的Hg-CTS吸附剂投加量、溶液初始pH、吸附时间对硫酸废水中Cl^-吸附效果的影响进行研究。实验结果表明,Cl-初始质量浓度为1 000 mg/L,Hg-CTS投加量为0.8 g/L,反应时间为20 min,pH为3的最优条件下,Cl^-的去除率达到94%,吸附容量为117.42 mg/g。同时,Hg-CTS吸附剂对Cl-吸附动力学符合拟二级动力学模型。

尾砂胶结充填材料配比强度变化特性研究

矿山地下矿产资源的开采活动形成大量空区,使地表工业及民用场所存在塌陷的风险,为减小矿山资源开采对此周边环境造成的影响,充填采矿法近年被广泛应用于开采实践中,其中尾砂作为充填材料应用也越来越广泛,而如何调节尾砂胶结材料的配比,提高充填强度便显得极为重要。以广西某矿山连选试验全尾砂和水泥为材料,设计灰砂比为1∶3、1∶4、1∶6、1∶8、1∶12五组,料浆浓度为78%、76%、74%、72%四种组合,总计20组配比材料,并对样本试样进行四个龄期(3、7、28、60 d)的强度测试,测试结果显示,随着龄期增加充填体试样强度逐渐变大,且料浆浓度的提高对充填体试块的强度增大也是有益的。根据试验测试结果,从经济和可行性方面综合考量,确定浓度为74%,灰砂比为1∶4时为较优的配比组合,其60 d龄期抗压强度达到2.864 MPa,满足该矿山充填体强度要求。

Effect of mineral processing wastewater on flotation of sulfide minerals

The effects of mineral processing wastewater on sulfide minerals were investigated by flotation,infrared spectrometry and electrochemistry test. The results show that lead-concentrate water can improve the flotation of galena,while the sulfur-concentrate water has negative effect on flotation of galena compared with distilled water. The flotation behavior of pyrite is contrary to that of galena in three kinds of water. Infrared spectra indicate that the residual collector in the lead-concentrate water is beneficial to the formation of lead xanthate on the surface of galena. Electrochemistry results indicate that electrochemistry reaction on galena surface has apparent change. The anode polarization is improved and cathode polarization is depressed.

Preparation of pure SbCl_3 from lead anode slime bearing high antimony and low silver

A novel treatment process of lead anode slime bearing high antimony and low silver was developed by a potential-controlled chloridization leaching and continuous distillation.The experimental results show a high Sb 3+ concentration,489.2 g/L,in the leaching solution for two-stage countercurrent leaching process,and the leaching rates of Sb,Cu,Bi more than 99% when the potential is controlled at 450 mV.When the leaching solution is distillated and concentrated at 120°C,almost all the silicon compound is evaporated into the concentration distillate and exists as amorphous hydrated silica.By the continuous distillation,high pure SbCl3 could be prepared,and AsCl3 is enriched in the distillate while metals Bi,Cu are enriched in the continuous distillation residue.As a result,the recovery rate of Sb is more than 95%.

Electronic structure and flotation behavior of monoclinic and hexagonal pyrrhotite

Electronic structures of monoclinic and hexagonal pyrrhotite were studied using density functional theory method,together with their flotation behavior. The main contribution of monoclinic pyrrhotite is mainly from Fe 3d, while that of hexagonal pyrrhotite is from Fe 3d, Fe 3p and S 3s. The hexagonal pyrrhotite is more reactive than monoclinic pyrrhotite because of large density of states near the Fermi level. The hexagonal pyrrhotite shows antiferromagnetism. S—Fe bonds mainly exist in monoclinic pyrrhotite as the covalent bonds, while hexagonal pyrrhotite has no covalency. The main contributions of higest occupied molecular orbital(HOMO) and lowest unoccupied molecular obital(LUMO) for monoclinic pyrrhotite come from S and Fe. The main contribution of HOMO for hexagonal pyrrhotite comes from Fe, while that of LUMO comes from S. The coefficient of Fe atom is much larger than that of S atom of HOMO for hexagonal pyrrhotite, which contributes to the adsorption of Ca OH+ on the surface of hexagonal pyrrhotite when there is lime. As a result, lime has the inhibitory effect on the floatation of hexagonal pyrrhotite and the coefficient of Fe is very close to that of S for monoclinic pyrrhotite. Therefore, the existence of S prevents the adsorption of Ca OH+on the surface of monoclinic pyrrhotite, which leads to less inhibitory effect on the flotation of monoclinic pyrrhotite.

高水平应力下孤岛破裂矿柱开采技术研究与应用

铜坑矿92^#矿体采用空场嗣后废石充填法、组合崩落法进行开采,由于采空区治理不及时、不彻底,预留的盘区柱在高水平应力作用下片帮、冒顶,成为难采孤岛破裂矿柱。以201^#线孤岛破裂盘区柱为试验采场,通过开展岩石完整性测试,评价采场底部结构的稳定性,采用数值模拟方法对盘区柱破裂演化规律进行分析,评价破裂矿柱诱导崩落的可行性,并运用"部分空场-诱导崩落法"联合回采,实现破裂矿柱诱导崩落,试验采场贫化率由29.4%降低至17.5%,损失率由43.8%降低至26.3%,取得良好的安全生产效果,可为其它类似开采条件的破裂矿柱回采提供技术参考。

Reagent types and action mechanisms in ilmenite flotation:A review

Ilmenite is an essential mineral for the extraction of titanium.Conventional physical separation methods have difficulty recovering fine ilmenite,and dressing plants have begun applying flotation to recover ilmenite.The interaction of reagent groups with Ti and Fe sites on the ilmenite surface dramatically influences the ilmenite flotation.However,the investigation on Fe sites has received more attention because the activity of Ti is lower than that of Fe.For the activators on ilmenite flotation,most are metal ions but typically lead ions.The metal ions of activators promote ilmenite flotation by increasing the active sites on the ilmenite surface.Combined reagents have a better selective separation of ilmenite than single reagents due to their synergistic effect.Combining the lead ion(Pb^(2+))and the benzyl hydroxamic acid(BHA)into a Pb-BHA complex has a marked effect on ilmenite flotation,which puts forward a new idea of developing combined reagents for ilmenite flotation.This review considers reagent types and action mechanisms in ilmenite flotation.On the basis of the analysis of previous research,a brief future outlook of reagent types and action mechanisms in ilmenite flotation is also proposed in this study.

Removal of chloride from simulated acidic wastewater in the zinc production

The removal of chloride from the zinc electrolyte produced during hydrometallurgical zinc production is challenging. The ion-exchange method is a promising way to remove chloride if the resin washing wastewater can be recycled. This paper focuses on chloride removal from resin washing wastewater to enable its reuse. Various processing factors including the oxygen gas velocity, temperature, and reaction time were investigated systematically. The results show that the optimal conditions for dechlorination are an oxygen gas velocity of 0.5 L-min^-1, a reaction temperature of 80 ℃, and a reaction time of 30 min. A dechlorination efficiency of 80% with a residual chloride ion concentration less than 200 mg-L^-1 was achieved, which meets the requirements for the recycling of wastewater. The presence of manganese accelerates the dechlorination by forming a Mn^2+- MnO^2-MnO4^-Mn^2+ redox cycle. In this process, about 15 kg of the MnO2 and all of the zinc can be recovered from 100 m^3 wastewater, and the wastewater can be reused, which makes the ion-exchange method a promising technique for chloride removal.

锚网支护参数优化研究

在介绍块体理论及程序的基础上,以铜坑矿92号矿体4个裂隙岩体试验区巷道为例,充分利用一般块体理论General Block程序和关键块体理论Unwedge程序快速确定1~#、2~#、3~#和4~#四个试验区内巷道的最优锚网支护参数。研究成果可为其它地下工程复杂裂隙岩体的锚网支护提供参考。

降低焦磷酸亚锡产品浊度的研究

本文针对焦磷酸亚锡产品浊度高和不稳定的问题,在制备以及烘干工段对焦磷酸亚锡的生产工艺参数和工艺条件进行了研究。重点探讨反应溶液的温度、反应终点溶液p H值、烘干时间和烘干真空度等因素对产品浊度的影响,进而稳定和提高产品质量。

Removing Iron by Magnetic Separation from a Potash Feldspar Ore

A new permanent magnetic separator was introduced to treat the ores with the characteristics of weak magnetic iron minerals and in a fine size range. The new machine was applied to the iron removal from potash feldspar. The effects of the magnetic field intensity, pulp density and grinding fineness on the iron removal were investigated. The optimized operation parameters were achieved and listed as follows： the -0.074 mm content is 85%, the pulp density is 45% and the magnetic field strength is 2T. A close test of middles regrinding was also carried out to improve concentrate yield. The data show that the grade of TFe（total iron） in potash feldspar product decreased from 1.31% to 0.21% and the concentrate yield reached 85.32%. All the results indicated that the traditonal high-intensity electromagnetic separators can be betterly substituted by the new permanent magnetic separator. This study may provide the theoretical evidence for iron removal from potash feldspar.

非稳态低浓度二氧化硫烟气资源化的实验研究

用实验研究了氧化锌烟尘处理非稳态低浓度二氧化硫问题,探讨了氧化锌烟尘湿度、用量、烟气流量、烟气中二氧化硫浓度等因素对氧化锌烟尘脱硫效率的影响。实验发现:氧化锌烟尘在湿度30%、用量30g、烟气流量为200L/h、烟气中二氧化硫浓度为0.2%时;氧化锌烟尘的脱硫效率在95%以上,持续时间为30min,尾气中二氧化硫浓度<300mg/m^3,达到GB30770-2014的要求。

广西大厂矿田巴力—龙头山矿区锡多金属矿床地质特征及成矿条件分析

大厂矿田孕育了世界瞩目的大型锡多金属矿床,巴力—龙头山矿区是大厂矿田的重要矿区之一,文章通过地质勘查和对矿床地质特征、成矿条件进行分析研究,认为100号与105号主矿体共同构成了缓-陡-缓“S”形螺旋状矿体,预示着隐伏花岗岩体的侵入方向,是自南东向北西向侵入的;在“S”形螺旋状矿体边部,仍有平行矿体存在的可能性;生物礁灰岩的底板下,成矿潜力巨大;隐伏花岗岩的侵入面同样是找矿突破的重要区域。