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以硫酸为浸出剂,进行了酸浸初步分离铁、钪的研究,考察了反应时间、反应温度、液固比、硫酸浓度等对浸出率的影响。结果表明,在40 ℃、液固比10∶1、硫酸浓度10 mol/L条件下浸出30 min,铁、钪浸出率分别为11.32%、58.41%。酸浸铁、钪的动力学研究结果表明,赤泥酸浸铁的过程符合未反应收缩核模型,受化学反应控制,其表观活化能为41.79 kJ/mol;而赤泥酸浸钪的过程符合多相液固区域反应动力学特征,受扩散控制,其表观活化能为6.72 kJ/mol。 相似文献
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难选镍钼矿的预处理试验研究 总被引:1,自引:0,他引:1
采用湿法冶金方法对从低品位难选镍钼矿中除去碱性脉石的工艺进行了探讨。考察了浸出时间、酸度、液固比及反应温度等因素对除去碱性脉石的影响。实验结果表明:对于粒度小于0.015mm的低品位难选镍钼矿,在盐酸浓度为2mol/L、液固比为3∶1、搅拌2h及常温的优化实验条件下,可使低品位难选镍钼矿除去碱性脉石达到最佳效果,矿石中钙的除去率在97%以上,矿石的失重率在38%左右。 相似文献
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本文以砷锑铋中和富集渣为原料,研究了盐酸浓度、液固比、反应温度及反应时间对Bi、Cu、Pb、As、Sb的浸出行为及Bi的浸出动力学。结果表明:当盐酸浓度为6.0 mol/L、液固比为6:1、温度为80 ℃、浸出时间为15 min时,Bi、Cu、Pb、As、Sb的浸出率分别为97.4 %、96.1 %、75.9 %、93.6 %、96.0 %;铋浸出过程动力学可分为两个阶段控制,前期受界面传质与扩散的混合控制,后期受化学反应控制,反应活化能分别为14.50 kJ/mol和82.80 kJ/mol。 相似文献
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低品位红土镍矿还原焙砂氨浸试验研究 总被引:17,自引:1,他引:17
本研究采用选择性还原焙烧—氨浸工艺从低品位红土镍矿中综合提取镍、钴、铁,重点介绍了该工艺氨浸的试验研究。确定的最佳工艺条件为:NH3?∶CO2为90g/L∶60g/L,焙砂粒度-0.074mm占80%,液固比为2∶1(mL/g),浸出初始温度为25℃左右,浸出终点电位大于-100mV。综合试验的镍、钴浸出率分别为89.87%和62.20%。研究表明,在常温常压下采用氨浸法不但可以有效地回收镍、钴、铁,而且浸出剂可以循环使用,设备运行安全可靠,可取得较好的经济效益。 相似文献
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硫化亚铁还原浸出锰结核试验研究 总被引:1,自引:0,他引:1
采用硫化亚铁作还原剂, 硫酸作浸出剂,浸出锰结核中的Cu、Co、Ni。研究了FeS用量、浓硫酸用量、反应温度、浸出时间、液固比等对Cu、Co、Ni浸出率的影响,确定浸出优化条件, 在锰结核质量为50 g, FeS加入量为20 g, 浓硫酸加入量为25 mL, 液固比6∶1的条件下Cu、Co、Ni的浸出率为: 95.58%、99.61%、98.74%。而Mn、总铁的浸出率为98.60%、25.54%。 相似文献
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印度尼西亚某低品位红土镍矿含镍1.57%、含铁21.67%,其中镍主要以硅酸镍形式存在。为将该矿石的镍含量提高到6%以上以符合印度尼西亚政府对出口红土镍矿的规定,以硫酸钠和碳酸钠为助熔剂,进行了还原焙烧-弱磁选试验。试验结果表明,当煤用量为25%、硫酸钠+碳酸钠的配比和总用量分别为3∶1和20%、焙烧温度为1 200 ℃、焙烧时间为60 min、磨矿细度为-0.074 mm占85%、磁场强度为96 kA/m时,可获得产率为22.06%、镍品位为6.05%、镍回收率为85.03%、铁品位为65.74%、铁回收率为66.92%的镍铁精矿,其镍品位超过印度尼西亚出口红土镍矿的品位下限。 相似文献
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Cobalt is usually recovered as a by-product of copper and nickel processing, and only a small amount of cobalt is derived from laterites although a vast majority of cobalt resources in them. The exploitation of limonitic laterite containing high content of cobalt is becoming increasingly important. The mineralogy of a limonitic laterite ore was characterized by environmental scanning electron microscope (ESEM) and X-ray diffraction (XRD) in this paper. The results show that nickel occurs in goethite mainly, while cobalt is predominantly associated with manganiferous minerals. Thiosulfate is found to be able to selectively leach cobalt from limonitic laterite in the presence of sulfuric acid, and 91% Co, 22% Ni, 10% Fe are leached from an ore containing 0.13% Co, 1.03% Ni within the first 5 min at 90 °C under the conditions of 10 g/L sodium thiosulfate, 8% (w/w) sulfuric acid and 10:1 L/S ratio. The leaching kinetics of Mn and Co by acidic sodium thiosulfate solution can be characterized by the Avrami equation. In acidic solution, thiosulfate readily decomposes into sulfur and sulfur dioxide as intermediary reagents to reduce pyrolusite (MnO2) and goethite (FeOOH); therefore, nickel and cobalt associated with goethite and pyrolusite respectively are extracted due to reduction dissolution. Furthermore, cobalt is selectively leached over iron and nickel because pyrolusite is preferentially reduced by acidic thiosulfate rather than goethite. The novel process may give an alternative method to selectively recover cobalt as the primary product from limonitic laterites at atmospheric pressure. 相似文献
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C.H. KöseY.A. Topkaya 《Minerals Engineering》2011,24(5):396-415
The research work presented in this paper determined the optimum conditions at which nickel and cobalt could be obtained at maximum efficiency from the column leach liquor of the lateritic nickel ore existing in Gördes region of Manisa in Turkey by performing effective hydrometallurgical methods. This column leach solution was initially neutralized and purified from its basic impurities by a two-stage iron removal process, nickel and cobalt were precipitated in the form of mixed hydroxide precipitate from the purified leach solution by a two-stage precipitation method called “MHP” and a manganese removal process was performed at the optimum conditions determined experimentally. By decreasing manganese concentration with this process to an acceptable level yielding at most 10% Mn in hydroxide precipitate, it was possible to produce a qualified MHP product suitable to the current marketing and standard conditions. The experiments conducted showed that by maintaining recycle leaching with sulfuric acid at which 95% of Ni-Co could be recovered from the precipitates, about 81% of Ni and 63% of Co in the lateritic nickel ore (9.72 kg Ni/ton of ore and 0.28 kg Co/ton of ore) could be extracted as mixed hydroxide precipitate by MHP process. 相似文献
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以混合酸抗坏血酸和葡萄糖酸作为浸出体系,辅以微波加热技术从废旧三元锂电池正极材料中浸出有价金属。采用N-N,二甲基吡咯烷酮(NMP)对废旧三元锂电池正极材料进行预处理,单因素试验确定了最佳条件为微波温度90℃、微波反应时间6 min、抗坏血酸浓度0.5 mol/L、葡萄糖酸浓度1 mol/L以及固液比20 g/L,获得对应Mn、Co、Ni、Li的最佳浸出率分别是99.5%、98.7%、99.7%、97.8%,并利用XRD、SEM和XPS对正极材料和不同条件下浸出后固体残留物进行表征分析。通过传统浸出与微波辅助浸出方法的对照,发现微波辅助浸出的效率更高。 相似文献
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针对云南省元江红土镍矿的矿物组成特点,在比较国内外红土镍矿处理工艺的基础上,提出了还原—磨矿—选别—氧化浸出工艺处理该矿,并进行了全流程试验。首先进行了还原—磨矿—选别试验研究,主要考察了还原温度、还原时间、添加剂配比和还原剂配比对指标的影响;其次进行了综合试验。试验结果表明,还原—磨矿—选别可以抛弃红土镍矿中80%以上的脉石,同时实现镍钴铁富集,氧压浸出工艺可实现镍钴与铁的分离,并获得铁红产品。通过试验,获得的技术指标为:从原矿至氢氧化镍(钴)段,镍直收率大于75%、钴直收率大于70%和铁直收率大于80%;氢氧化镍产品镍的品位大于31%,氢氧化钴产品钴的品位大于0.70%,铁红产品铁含量大于62%,铁红达到铁精矿要求,可以作为铁精矿出售。该工艺实现了镍钴铁综合回收,资源利用率高,环境友好,为综合回收红土镍矿中镍钴铁提供一条新的工艺技术路线。 相似文献