赞比亚某复杂铜矿预处理—酸浸提铜试验

赞比亚某复杂难选氧化铜矿石矿物组成复杂,属结合相占比较高的氧化铜矿石,铜品位为2.10%。为开发利用该铜矿石资源,采用预处理—硫酸酸浸工艺进行了浸铜工艺参数研究。结果表明,在磨矿细度为-200目占58%,预处理剂K1浓度为9%、液固比为1∶1、预处理温度为85℃、预处理时间为1 h,酸浸的硫酸浓度为5%、液固比为1.5∶1、浸出温度为50℃、浸出时间为3h的情况下,可取得88.83%的铜浸出率。较好地解决了矿石的铜浸出问题,为开发利用该铜矿资源提供了技术依据。

多金属复杂铜矿常压氧浸工艺

在常压下以稀硫酸为浸出剂,工业氧(99%)为助浸剂,采用单因素试验法,研究了硫酸浓度、液固比、温度、氧气流量、反应时间对多金属复杂铜矿中的有价金属铜、铁、锌浸出效果的影响。结果表明:在H_(2) SO_(4)浓度1.00 mol L、液固比12 mL g、反应温度85℃、氧气流量0.3 L min、反应时间8 h的较优条件下,铜、铁、锌的浸出率分别为99.97%、32.92%、64.79%,铅的浸出率很低。浸出渣主要由硫酸铅、闪锌矿、黄铁矿、方铅矿及元素硫等组成,并分析了锌和铁浸出率较低的原因。浸出液pH在0.5~0.6,有利于后续浸出液中铜的富集回收。

新疆某复杂硫化铜矿低温低压浸出工艺研究

针对我国新疆某地伴生锌、砷的复杂铜精矿 ,研究低温、低压 ( 110℃ ,10 0～ 5 0 0kPa)浸出新工艺。黄铜矿氧化率可达到98% ,黄铁矿氧化率低于 10 % ,实现了黄铜矿的选择性浸出。砷与铁形成稳定的砷酸铁进入浸出渣 ,90 %以上的硫生成元素硫。

响应曲面法优化复杂硫化铜矿选择性浸出工艺

研究复杂硫化铜矿中铜铅分离及选择性浸出铜的方法。在高铅铁硫化铜矿中加入氧化钙焙烧,解离铜、铁和铅,对焙砂进行选择性硫酸浸出铜;采用扫描电镜(SEM)、X射线衍射分析仪(XRD)及能谱分析仪(EDS)表征原料、焙砂和浸出渣的结构和形貌,揭示高铅铁硫化铜矿的焙烧和选择性浸出行为。用响应曲面法及中心复合设计原理,建立浸出温度、液固比、酸度及三者间交互作用对铜、铁浸出率影响的多元二次回归方程。结果表明:钙化焙烧能固硫和解离复杂硫化铜矿,以铜浸出率大于96.0%、铁浸出率最低为目标条件时,最佳选择性浸出条件如下:浸出温度70℃、液固比7.99:1、酸度102.44 g/L,最佳条件下铜的浸出率为96.05%,铁的浸出率为15.14%,与验证实验中铜和铁的平均浸出率分别为96.17%和15.20%相比,二者偏差较小,表明模型准确,优化方案可信。

综合回收复杂铅锌矿伴生铜资源浮选新工艺试验研究

文章从试样的工艺矿物学研究出发,在查明试样矿物组成、赋存状态和嵌镶关系的基础上,确定了优先浮选的实验方案。尔后进行了大量的条件试验以确定最佳的工艺流程和工艺参数,进行全流程闭路试验,取得了良好的分选指标后,再在工业上进行工业应用试验。其主要技术创新点有:采用高效捕收剂BP实现铜铅优先浮选;采用高效无毒组合抑制剂实现铜铅的有效分离;采用铜中矿集中旋流器分级再磨处理解决了铅的恶性循环和单体解离度低,有效地解决了铜铅分离的技术难题。该工艺的成功应用,为有效利用有限的不可再生伴生铜资源,提供了详实的技术依据。

Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate

The leaching kinetics of copper from low-grade copper ore was investigated in ammonia-ammonium sulfate solution with sodium persulfate. The effect parameters of stirring speed, temperature, particle size, concentrations of ammonia, ammonium sulfate and sodium persulfate were determined. The results show that the leaching rate is nearly independent of agitation above 300 r/min and increases with the increase of temperature, concentrations of ammonia, ammonium sulfate and sodium persulfate. The EDS analysis and phase quantitative analysis of the residues indicate that bornite can be dissolved by persulfate oxidization. The leaching kinetics with activation energy of 22.91 kJ/mol was analyzed by using a new shrinking core model （SCM） in which both the interfacial transfer and diffusion across the product layer affect the leaching rate. A semi-empirical rate equation was obtained to describe the leaching process and the empirical reaction orders with respect to the concentrations of ammonia, ammonium sulfate and sodium persulfate are 0.5, 1.2 and 0.5, respectively.

Optimization of copper extraction for bioleaching of complex Cu-polymetallic concentrate by moderate thermophiles

Effects of initial pH, temperature, liquid volume, rotation speed, galvanic interaction （pyrite ratio） and pulp density on bioleaching of complex Cu-polymetallic concentrate were investigated. The results indicated that the copper extraction at pH 1.5 was 1.5 and 1.4 times that at pH 1.0 and pH 2.0 respectively. The copper extraction obtained at 45 ℃ was 1236.8%higher than that at 50 ℃. With the increase of rotation speed or the decrease of liquid volume, copper extraction was improved obviously. Copper extraction was improved gradually with the increase of pyrite ratio. However, when the ratio was higher than 20.0%, no further increase in copper extraction was observed. And the statistically significant interactive effects on copper extraction were found between temperature and pH, and temperature and pyrite ratio.

Effect of temperature on leaching behavior of copper minerals with different occurrence states in complex copper oxide ores

The effect of temperature on leaching behavior of copper minerals with different occurrence states in complex copper oxide ores was carried out by phase analysis means of XRD, optical microscopy and SEM-EDS. The results indicated that at ambient temperature, the easily leached copper oxide minerals were completely dissolved, while the bonded copper minerals were insoluble. At lukewarm temperature of 40℃, it was mainly the dissolution of copper in isomorphism state. With increasing temperature to 60℃, the copper leaching rate in the adsorbed state was significantly accelerated. In addition, when the temperature increased to 80℃, the isomorphic copper was completely leached, leaving 11.2% adsorbed copper un-leached. However, the copper in feldspar-quartz-copper-iron colloid state was not dissolved throughout the leaching process. Overall, the leaching rates of copper in different copper minerals decreased in the order: malachite, pseudo-malachite > chrysocolla > copper-bearing chlorite > copper-bearing muscovite > copper-bearing biotite > copper-bearing limonite > feldspar-quartz-copper-iron colloid.