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氧在氰化提金过程中起着极其重要的作用。提高氰化矿浆中溶解氧的含量,可明显地加快金的浸出速度,提高金的浸出率。阐述了富氧氰化浸出的理论基础、试验研究、工业应用及其生产实例,并提出发展与应用方面的意见。 相似文献
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以一矿井水抽排工作为例,介绍了水泵排水扬程计算过程中管路沿程损失和管道局部水头损失的计算方法,为排水系统泵的选型设计提供了有益借鉴。 相似文献
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研究了搅拌磨湿法超细磨得金精矿(-20μm>97%)的氰化浸出工艺,探讨了影响金精矿氰化浸出的因素,并与常规滚动式球磨机湿法磨得金精矿氰化浸出指标进行对比。结果表明,通过优化氰化浸出各种因素,可大大缩短氰化浸出时间,氰化钠和碱石灰用量分别降低了1 kg/t、1.47 kg/t,金的浸出率提高了0.49个百分点,浸渣含金量降低了0.21 g/t,效果显著。 相似文献
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分析液压系统中压力损失产生的原因,介绍液压油在圆管呈层流和紊流2种流动状态时,沿程压力损失的计算公式,对液压管道、液压附件等局部阻力系数及压力损失计算方法进行探讨;提出减少液压系统中压力损失的相关方法。 相似文献
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针对两段焙砂中赤铁矿包裹造成渣含金过高的问题,结合铁氧化物包裹金的研究现状,重点研究了两段焙砂硫酸熟化过程的热重差热和微观结构变化以及对水浸渣的提金效果和氰化钠消耗量的影响。结果表明,生成水合硫酸盐过程主要发生在127.8~249.1℃,该过程中,物料的微观形貌由疏松多孔蜂窝状转变成疏松片状。两段焙砂用浓度75%的硫酸在250℃熟化90 min,水浸除铁率达91.69%,水浸渣氰化浸金率达95.54%,比焙砂直接氰化提高了近11%,氰化尾渣金品位由直接氰化浸出的9.10 g/t降至5.88 g/t,氰化钠消耗量也降低了近一半。研究结果对提高两段焙砂中金浸出率具有重要意义。 相似文献
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在氰化浸出过程中 ,pH值是关键的技术参数。一般情况下 ,pH值控制在 10~ 10 5 ,而从浸出动力学角度看 ,pH值控制在 9 5左右更有利于浸出向正反应方向进行。峪耳崖金矿炭浆厂的生产实践充分说明了这一点。 相似文献
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山东某浮选金精矿工艺矿物学研究表明,该精矿主要金属矿物为黄铁矿,铜、铅、锌、砷等金属元素含量都比较低,对该精矿采用氰化浸出金、银比较有利,浮选精矿含金品位平均为21.86 g/t,含银10.5 g/t、硫47.16%.矿物组成比较简单.实验结果表明,采用直接氰化搅拌浸出可以获得金浸出率为95.06%,银浸出率71.43%的良好指标. 相似文献
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《Minerals Engineering》2000,13(10-11):1097-1106
A large proportion of the gold processed in the 21st 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/Sx. 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. 相似文献
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金的赋存状态和工艺矿物学特性是提高金回收率的根本因素。青海某氰渣浮选尾矿中金品位偏高,达3.2g/t,损失严重。为查明金损失原因,利用BPMA-SEM-EDS等手段对尾矿进行了深入的研究。结果表明:金矿物种类相对简单,主要为自然金,含少量银金矿;金矿物的嵌布粒度微细,绝大多数嵌布粒度在5微米以下;裸露金占有率15.26%,包裹金占有率84.11%且绝大多数被黄铁矿包裹;样品中存在少量砷酸盐类矿物,可能会影响金的浸出。提高磨矿细度和适当延长浸出时间,有利于金的浸出;通过浮选富集黄铁矿可以富集金,再进一步细磨,有利于金的进一步回收;重视脱除砷的影响,有利于提高金的浸出指标。 相似文献
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One of the biggest challenges for the gold industry in the 21st century is the presence of copper in gold containing ore bodies. This is because copper consumes large quantities of cyanide. In addition, copper cyanide species are more stable than free cyanide, and hence are problematic in events of tailings spillage. One of the methods which has been suggested for treating copper containing ores is to leach with an ammonia cyanide solution. The effect of copper and ammonia addition on gold leaching kinetics was studied in the present paper. It will be shown that when the solutions do not contain copper, the addition of ammonia decreases the rate of gold leaching. When copper is added to solution, the leach rate does decrease due to the formation of the copper cyanide complexes. However it will be shown that under conditions of zero free cyanide, gold does leach readily via the Cu(CN)32− complex. It was found that the addition of ammonia had little effect on the leaching of gold by Cu(CN)32−, but did increase the leaching kinetics when the major cyanide species present is Cu(CN)2−. Under these conditions, leaching in the absence of ammonia is very slow. The effect of copper(II) addition was also studied, and it was found that in the absence of free cyanide the presence of copper(II) increases the leach rate, provided there is enough ammonia to stabilise it against reaction with the copper(I) cyanide complexes. 相似文献
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基于两相流欧拉理论对大型矿浆搅拌槽内部流场进行了三维模拟,深入研究了3种不同桨型对矿浆体积分数分布的影响。模拟结果表明:在大型矿浆搅拌槽搅拌过程中,搅拌桨的四周形成一个负压区,在负压区的上下产生旋转相反的涡流;矿浆流速的最大值出现在搅拌桨的浆叶区,且标准三叶推进式叶轮所产生的流速最小,紊流效应小;在转速和矿浆体积分数相同的条件下,标准六叶直叶片式叶轮和六斜叶开启涡轮式叶轮在搅拌过程中都有槽底沉降区域出现,矿浆体积分数分布不均,而标准三叶推进式叶轮矿浆体积分数混合均匀,搅拌效果最佳。 相似文献