共查询到20条相似文献,搜索用时 125 毫秒
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对某含铜物料进行常压通氧酸浸研究,考察液固比、加酸量、温度、浸出时间对含铜物料中镍、铜浸出率的影响。结果表明,在常压条件下通过酸浸能够将含铜物料中的铜浸出,镍部分浸出,在下述最佳浸出条件下,铜、镍、铁的浸出率分别为96.65%、7.63%、39.84%:液固比8∶1、温度85℃、加酸量120g/L、时间6h。 相似文献
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探讨了硫化锌精矿氧压浸出的酸平衡和热平衡,通常情况下硫化锌精矿氧压浸出无法实现酸平衡和热平衡,需要补充硫酸和热量。通过改变浸出氧势,使少部分硫氧化成硫酸根,可以实现硫化锌精矿氧压浸出的酸平衡,并能实现浸出物料自热后还有多余热量产生。 相似文献
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王金刚 《有色冶金设计与研究》2013,34(5)
高SiO2低Fe物料的投入一度使ISF生产产生较大的波动.针对此类物料入炉后的炉况,分析了烧结块中SiO2和Fe在熔炼过程中的变化,及此类物料对生产的危害,并提出了相应的解决措施.根据实际生产中的实践操作实例可以看出,韶关冶炼厂的经验措施能有效地降低处理这类物料所带来的不利影响. 相似文献
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《稀有金属》2015,(10)
对高铅含硒物料进行了湿法处理工艺探讨,根据物料的X射线荧光光谱分析(XRF)、多元素分析及元素硒的物相分析结果,对比考察了不同强化浸出剂的处理效果,并考察了不同浸出因素对强化浸出效果的影响,同时研究了不同还原因素对浸出液中硒还原率的影响,最终确定了合适的处理工艺。结果表明,采用硫酸作为强化浸出剂硒的浸出效果最好;采用硫酸进行强化浸出硒,在液固质量比为1.5∶1.0、温度90℃、浸出2.5 h的最佳条件下,浸出渣中硒品位小于0.5%,硒的浸出率可达96%以上;含硒料液最佳还原条件:温度为70℃、氯离子浓度为0.06 mol·L-1、亚硫酸钠加入理论用量1.2倍,此时还原后液中硒含量小于0.03 mg·L-1,硒还原率高达99.99%,还原获得粗硒中硒含量93%左右,硒的总回收率达到96.7%。该工艺从高铅含硒物料中回收硒,可以简洁有效地处理此类含硒物料。 相似文献
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低品位硫化镍矿中含镁硅酸矿物易被酸溶解出Mg^2+而影响其有价金属提取。采用不同氧化浸出体系研究了Mg^2+对硫化镍矿中Ni、Cu、Mg、Fe浸出的影响,利用循环伏安、动电位极化、交流阻抗等方法研究了Mg^2+影响硫化镍矿中硫化矿物氧化溶解电化学行为。结果表明,试验范围内,低品位硫化镍矿中硫化矿物氧化浸出受氧化产物扩散影响控制,含镁矿物被酸溶解释放出Mg^2+进入溶液,游离的Mg^2+受硫化矿物表面负电性离子吸引而吸附在矿石表面,降低矿物表面氧化溶解双电层电荷转移内阻,加速电荷转移过程;另一方面,由于Mg^2+吸附影响,使得硫化镍矿表面氧化产物膜致密生长而显著负影响硫化矿物浸出,致使硫化矿物自腐蚀速率随Mg^2+浓度增加而降低。Mg^2+对含S物种电对间转化不利,与Fe^3+协同影响硫化矿物氧化浸出效率,低Mg^2+浓度促进Fe^3+/Fe^2+循环,而高Mg^2+浓度引起硫化矿物腐蚀产物层致密生长而降低矿物被溶解的速率。硫化镍矿在不同体系氧化浸出时,初始含Mg^2+条件下,Ni、Cu、Fe浸出效率低于无Mg^2+体系。 相似文献
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A new method, the concentrated sulfuric acid acidolysis and water leaching (SAWL) of nickeliferous oxide ores, is proposed and the optimal conditions for recovery of nickel, cobalt and copper from a low-grade Chinese nickeliferous oxide ore are presented. A series of experiments were conducted which examined the effect of acid charge, acid curing temperature and acid curing time. Recoveries of up to 95%, 83% and 95% for Ni, Cu and Co, respectively were obtained with only the sulfuric acid at ambient temperature and atmospheric pressure. Comparing the percolation leaching with agitation leaching showed that percolation leaching was capable of extracting the valuable metals with water. The SAWL method was scaled to three-stages counter-current leaching tests using 1 kg of ore. The results indicate greater than 90% extraction for nickel and cobalt. 相似文献
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MOJTABA AHMADIAN-TEHRANI JAMES L HENDRIX 《Mineral Processing and Extractive Metallurgy Review》2013,34(1-4)
Hypochlorite pretreatment of a refractory carbonaceous gold ore showed promise as a method for oxidizing sulfidic and carbonaceous materials prior to conventional cyanide heap leaching. However, previous studies showed hypochlorite consumption is high and gold extraction is proportional to hypochlorite consumption. The high hypochlorite consumption is due to oxygen depletion as the solution percolates through the ore charge. The relation of dissolved oxygen, potential, and pH with the bed height are investigated. The effect of solution application into the ore charge at different elevations on reagent consumption will be discussed. 相似文献
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《中国稀土学报(英文版)》2022,40(11):1803-1811
In order to inhibit the swelling of the clay minerals in the in-situ leaching process of weathered crust elution-deposited rare earth ores (WCE-DREO), diallyl dimethyl ammonium chloride (DMDACC) was introduced as an anti-swelling agent and combined with (NH4)2SO4 as a novel composite leaching agent. It can be found that the novel composite leaching agent exhibits a good anti-swelling performance and leaching capacity of rare earth, and has great potential on the actual exploitation of WCE-DREO. The anti-swelling mechanism of DMDACC was studied by characterization analysis. The results show that DMDACC with positive charges can be adsorbed on the clay particles by the electrostatic attraction and hydrogen bonds, and neutralize the negative charge of the clay particles. The double electrical layers are suppressed and the repulsion force between clay sheets decreases. It causes the clay particles prone to aggregate. Moreover, DMDACC can enter the interlayer and expel out the water molecules in interlayer. The interlayer spacing is decreased and the hydration swelling of the clay particles is weakened. It can provide a theoretical basis for the development of novel anti-swelling agents. 相似文献
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D. A. Rogozhnikov S. V. Mamyachenkov S. V. Karelov O. S. Anisimova 《Russian Journal of Non-Ferrous Metals》2013,54(6):440-442
Investigations into the nitric acid leaching of polymetallic middlings with the purpose of the maximal recovery of copper and zinc into the solution are performed. Using methods of mathematical planning of the experiment, the optimal process parameters are determined: ratio L : S = 5, the consumption of nitric acid is 80 cm3 per 20 g of the charge, and the process duration is 120 min. 相似文献
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