某浮选金精矿的氰化浸出工艺研究

研究了某浮选金精矿的氰化浸出过程，考察了金精矿粒度、氰化钠浓度、氧化钙浓度、浸出时间及液固比等对该浮选金精矿氰化浸金率的影响。在最佳浸出条件下，其氰化浸金率可达到97％以上。     

浮选金精矿充氧氰化浸出研究

以黑土沟浮选金精矿为研究对象,探索充氧对氰化浸出速度的影响。研究结果表明,充氧氰化浸出的速度几乎比常规氰化浸出快3倍,比充空气氰化浸出也快出许多。常规氰化过程中,特别是对于大容积浸出槽,矿浆严重缺氧,导致浸出速度减缓。充氧可以克服矿浆缺氧现象,并成倍提高溶解氧浓度,从而提高氰化浸出速度。     

某金精矿浸出试验研究及综合利用分析

为确定某金精矿产品处理方案进行了金精矿浸出试验研究,条件试验表明:磨矿细度和氰化钠用量是影响金浸出率的关键因素;金精矿Ⅰ较难浸出,根据最佳浸出条件采用常规浸出工艺金浸出率为83.28%,采用边磨边浸金浸出率84.26%;金精矿Ⅱ浸出率可达到87.59%,但浸渣选铜一段粗选铜回收率可达79.24%;最终该金精矿产品处理方案需要进行经济对比,同时需要考虑浸渣回收铜的可能性和经济分析;尾渣筛析表明,细粒级中金品位低,损失的金属于细粒的包体金。     

某含砷金精矿的焙烧氰化浸出工艺研究

采用化学物相分析法定量地研究了含砷金精矿及其焙砂中金的化学物相及其含量的变化，并对该精矿的焙烧及其氰化浸出过程进行了研究。介绍了焙烧温度和停留时间对该矿精的脱砷率和脱硫率以及浸出时间、氰化钠浓度、氧化钙浓度、液固比等对焙涛中氰化浸金率的影响。在最佳浸出条件下，其氰化浸金率可达到82％以上。     

云南某金精矿氰化提金试验研究

对云南某金精矿进行氰化提金工艺研究,该金精矿含金33.3 g/t,其中金主要以自然金的形式赋存于硫铁矿物或风化的金属氧化物裂隙中。试验主要从磨矿细度、氰化钠用量、石灰用量、浸出时间、液固比等几个因素考察对浸出率的影响,并通过试验确定了最适宜的工艺条件,在此条件下金浸出率可达97.90%。同时,研究了加助浸剂双氧水对浸出率、氰化钠耗量、浸出时间等工艺参数的影响。结果表明,加助浸剂可显著加快金的浸出速率,缩短浸出时间,并减少NaCN消耗。     

山东某金矿氰化浸出金的研究

针对矿石风化严重、具有多孔状结构的细粒自然金的特点,采用氰化浸出工艺回收金.用石灰作为保护碱,氰化钠作为浸出剂,通过优化工艺条件,在原矿金品位为4.45g/t时,可获得金浸出率为97.30％的指标.     

某高砷金精矿强化氰化浸出试验研究

国外某含砷金精矿含金29.92g/t、砷10.27%,针对该高砷金精矿,在工艺矿物学研究的基础上,进行了碱预浸、常规浸出、助浸剂强化浸出试验。试验结果表明,常规浸出60h,金浸出率为86.83%,加浸出剂2强化浸出48h,金浸出率达到92.95%,助浸剂2强化浸出不仅能提高金浸出率,而且能加快金的浸出速度,强化效果明显。     

浮选金精矿充氧氰化浸出研究

以黑土沟浮选金精矿为研究对象，探索充氧对氰化浸出速度的影响。研究结果表明，充氧氰化浸出的速度几乎比常规氰化浸出快３倍，比充空气氰化浸出也快出许多。常规氰化过程中，特别是对于大容积浸出槽，矿浆严重缺氧，导致浸出速度减缓。充氧可以克服矿浆缺氧现象，并成倍提高溶解氧浓度，从而提高氰化浸出速度。     

高砷难处理金精矿焙烧-氰化浸出工艺研究

对甘肃某高砷高硫难处理金精矿进行了氧化焙烧预处理—氰化浸出试验研究,取得了砷、硫脱除率分别达92.63%、99.81%,金的浸出率达85.23%的较好技术指标,可为有效利用高砷微细浸染型金矿资源提供参考。     

云南某金精矿氰化浸出试验研究

云南某金精矿工艺矿物学研究表明,该矿石为含金氧化矿—石英脉型岩金矿。金品位为38.23 g/t,银品位为28.82 g/t,金银可以一起进行综合回收,铜、砷、锑等杂质元素含量不高,碳含量较高,它的存在将会对金、银的浸出带来不利影响。试验结果表明,采用直接氰化搅拌浸出可以获得金浸出率为93.12%的良好指标。     

铅盐在高铜金精矿氰化提金试验中的应用与工业实践

河台金矿原矿含0 2%～0 3%的铜,以原生硫化铜为主,含硫1%左右,属贫硫化物含铜金矿石。从1989年建厂至1998年一直采用单一混合浮选工艺,生产含铜3%～5%的混合金精矿,这样影响了企业的经济效益。经试验研究采用铅盐预处理工艺获得成功,并建成氰化冶炼厂,本文介绍铅盐在高铜金精矿氰化浸金应用中的试验与工业实践情况。     

The cyanide leaching of gold in solutions containing sulfide

A large proportion of the gold processed in the 21^st century will be recovered from sulfide ores. Since the sulfide minerals are to some extent soluble in cyanide solutions, there will always be some sulfur species present in the leach solution. It has been shown that soluble sulfide hinders the rate of gold leaching, forming a protective layer of the type Au/S_x. Electrochemical studies of the constituent half reactions: gold oxidation; and oxygen reduction, were consistent with this view. The effect of sulfide and cyanide concentrations on the leaching reaction were investigated, and it was shown that the sulfur formed is chemically attacked by cyanide, resulting in higher leach rates at higher cyanide concentrations. The effect of lead was also studied and is discussed in detail.     

山东某风化壳型金矿氰化浸出试验研究

针对山东某风化壳型金矿进行了氰化浸出试验研究,考察了磨矿细度、氰化钠用量、石灰用量、液固比、搅拌时间等对金浸出效果的影响规律。试验结果表明,较粗的磨矿细度和较低的矿浆浓度对浸出更有利,在最佳的试验条件下,该矿石的金浸出率可达到95.87%,炭吸附率可达到99.58%。     

The role of metal-cyanide species in leaching gold from a copper concentrate

The cyanidation of copper-gold ores is a difficult issue owing to the ready formation of copper cyanide complexes during gold leaching. Moreover, the speciation of other metal cyanides in leach slurries and the interaction between them have not been researched extensively, and are of fundamental importance to gold mills.In this paper the role of the cyanide complexes of copper, silver, nickel, iron and zinc in gold leaching was investigated by examining the leaching of a copper concentrate. It was found that copper-cyanide and other metal cyanide species, including Ag, Fe, Ni and Zn, all play an important role in gold cyanidation under conditions of zero free cyanide. These species dissociate, and the cyanide made available by the dissociation leaches gold. These metals species then precipitate, usually as a hydroxide under typical leaching conditions. Silver is an exception, which may precipitate as a metal or AgCN species. When cyanide is present, the mechanism of copper-cyanide assisted gold leaching is the dissociation of the weakly bound fourth ligand of Cu(CN)₄³⁻. The cyanide made available can then be used to leach gold and other metals.     

Simulation study of the optimal distribution of cyanide in a gold leaching circuit

The mineral industry has been using cyanidation to recover gold from ores for more than a century; however, a systematic study of the best reactant addition strategy in a cascade of agitated leaching tanks is not available in the open literature. A phenomenological mathematical model of the gold cyanidation process, calibrated with a set of industrial data from an Australian plant, together with an economic performance index is used to analyze this problem. The simulated results show that the best compromise between the two antagonistic effects, cyanide consumption and gold recovery, which are both function of cyanide concentrations, leads to a reagent distribution that depends on the leaching and cyanide consumption kinetics, pulp feed characteristics, and economic factors such as the gold market value. For the specific studied plant, in the operating range of low cyanide consumption and fast gold dissolution, all the cyanide must be added in the first tank; however, in the operating conditions of high cyanide consumption, cyanide has to be distributed in the first, second and third tanks.     

某金精矿焙烧氧化-氰化尾矿工艺矿物学研究

为了查找某难处理金精矿焙烧氧化-氰化浸出工艺存在的问题,提高金的回收率,开展了尾矿工艺矿物学研究,查明了尾矿的矿石成分、矿物相对含量、硫化矿物的特征、金的赋存状态及其粒度特征。分析了工艺存在的问题,提出了工艺优化的技术措施和有价元素的综合利用研究思路。该尾矿金品位为3.98 g/t,金的嵌布粒度小于10 μm,包裹金占73.40%,连生体金占26.60%,提高焙砂的磨矿细度和延长浸出时间,有利于提高金的浸出率。