共查询到20条相似文献,搜索用时 15 毫秒
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《Minerals Engineering》2007,20(14):1293-1295
In this study sawdust was used as reductant for sulphuric acid leaching of manganese ore. Effects of pulp density, amount of acid, temperature, particle size of ore and amount of sawdust were studied. Manganese extraction of ∼98% was achieved under the conditions: leaching time 8 h, 5% H2SO4 (v/v), 10% pulp density, 90 °C and 5% sawdust (w/w), i.e. 0.5 g/g ore. Other Mn containing materials like low grade manganese ore, manganese nodule and Mn-nodule leach residues were tested and all these materials responded well giving more than 98% Mn extraction. 相似文献
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《Minerals Engineering》2002,15(3):139-155
The treatment of aqueous or oily effluents is one of the most serious environmental issues faced by the minerals and metallurgy industries. Main pollutants are residual reagents, powders, chemicals, metal ions, oils, organic and some may be valuable (Au, Pt, Ag). The use of flotation is showing a great potential due to the high throughput of modern equipment, low sludge generation and the high efficiency of the separation schemes already available. It is concluded that this process will be soon incorporated as a technology in the minerals industry to treat these wastewaters and, when possible, to recycle process water and materials. In this paper, the use of flotation in environmental applications is fully discussed. Examples of promising emerging techniques and devices are reported and some recent advances in the treatment of heavy metal containing waters and emulsified oil wastes are discussed. 相似文献
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Mohammad Soleimani Jochen PetersenReza Roostaazad Soheil HosseiniS. Mohammad Mousavi Alireza Najafi Akhtarolmolouk Kazemi Vasiri 《Minerals Engineering》2011,24(1):64-69
In this study, the Geocoat™ technology was used for the extraction of zinc from a mineral concentrate obtained from the Kooshk mine (Yazd, Iran) by a culture dominated by the mesophilic bacterium Acidithiobacillusferrooxidans in a packed column bioreactor. A low grade sphalerite ore was used as support for the concentrate coating. During the 100 days of leaching pH, Fe3+, Fetotal, microbial population density and zinc extraction were measured. The final zinc extraction from concentrate and low grade support was 97% and 78%, respectively, and it was found that leaching from the support does not proceed significantly before leaching from the coating is completed. 相似文献
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以稻草为还原剂硫酸浸出软锰矿动力学研究 总被引:3,自引:0,他引:3
以稻草为还原剂,采用硫酸浸出软锰矿,设计了单因素和正交实验,考察了稻草粒径及用量、硫酸浓度、浸出时间及温度对锰浸出率的影响,并分析了浸出过程动力学。结果表明,30 g粒径为100 μm的稻草,在363 K下,用1.4 mol/L的硫酸浸出50 g软锰矿5 h,锰浸出率可达90.74%。浸出过程实质是稻草水解产物与软锰矿发生氧化还原反应,该反应可用未反应收缩核模型描述,表观活化能为39.8 kJ/mol,反应速率受界面化学反应控制。按先水解稻草再浸出矿料的步骤可提高锰浸出率。 相似文献
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堆浸作业中的液固比是计算总需水量(溶浸液量)大小、估计溶浸液浓度和设计浸出液后处理设施的依据。恰当的液固比可避免化学原料浪费、设备容量浪费、以及设各及设施容量不足而带来的被动局面。文中叙述了液固比的意义,影响液固比的因素、液固比的获得方法和恰当液固比的经验数值。 相似文献
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国外某含铜金矿碳酸盐含量较高,不宜采用硫酸预浸铜-浸铜渣氰化回收金的工艺。针对该含铜金矿的性质特点,开展了氨氰选择性浸金及浸出贵液臭氧除铜工艺试验研究,研究结果表明:在给矿粒度-0.074mm95%,硫酸铵8kg/t,氰化钠0.4kg/t,石灰4kg/t(pH为9~10),矿浆浓度40%,金浸出率约90.3%;氨氰浸出贵液初始pH=10~11,通入臭氧除铜,铜沉淀率达99.0%,金基本不损失,沉铜渣铜品位33.89%,可以铜精矿形式出售,为该矿的开发利用提供可行的技术方案。 相似文献
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本文对国外某含铜金矿开展氨氰选择性浸金及浸出贵液臭氧除铜工艺试验研究,研究结果表明:在给矿粒度-0.074mm95%,硫酸铵8kg/t,氰化钠0.4kg/t,石灰4kg/t(pH为9-10),矿浆浓度40%,金浸出率约90.3%;氨氰浸出贵液初始pH10~11,通入臭氧除铜,铜沉淀率达99.0%,金基本不损失,沉铜渣铜品位33.89%,可以铜精矿形式出售。 相似文献
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福建某斑岩型金矿品位低、规模大,金主要以自然金形式存在,可见金的粒度较粗,为高效利用该低品位金矿,开展新型浸金剂金蝉全泥浸出试验和柱浸试验,结果表明:全泥浸出在磨矿细度为-0.074 mm占80%、矿浆浓度25%、加石灰调pH 值11.0左右、初始金蝉浓度为500 mg/L和过程中控制金蝉浓度不小于300 mg/L条件下浸出20 h,金的浸出率为93.43%,金蝉耗量为1.02 kg/t;柱浸在矿石粒度为-30 mm条件下喷淋浸出23天,金累计浸出率和金蝉累计耗量分别为86.54%和1.22 kg/t。 相似文献
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酸性含铜废水处理的试验研究 总被引:2,自引:0,他引:2
用鸡蛋壳处理某溶浸实验室酸性含铜废水(ρ(Cu2+)为143.00 mg/L,pH值为1.80~2.00).研究了不同煅烧温度、蛋壳用量和粒度,以及搅拌速度对处理效果的影响.结果表明:在煅烧温度为400 ℃,蛋壳用量为25 g/L,蛋壳粒度为0.25 mm,搅拌速度为240 r/min的条件下,蛋壳可将酸性含铜废水的pH值由1.80~2.00提高到6.86~7.34,ρ(Cu2+)降低到0.09~0.43 mg/L,去除率可达99.70%~99.94%,处理后废水符合GB 8978-1996<污水综合排放标准>规定的一级标准.因此,用鸡蛋壳处理酸性含铜废水,工艺简单、操作方便、处理效果好,达到了"以废治废"的目的,具有一定的应用前景. 相似文献
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硝酸盐作为地浸采铀氧化剂工业化应用研究 总被引:2,自引:0,他引:2
报道了对硝酸根在氧化浸出和吸附淋洗中的作用和行为特点的研究情况。模拟试验和现场试验结果均表明,硝酸根在地浸采铀中是一种良好的氧化剂,同时又是良好的淋洗剂。且具有工艺简单、外排尾液少的优点,能明显的降低铀的开采成本。这一工艺对地浸采铀和其他矿物的原地浸出开采都有一定的应用价值。 相似文献
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