微波辅助高价锰还原浸出动力学研究

湿法还原浸取软锰矿是替代火法冶炼的重要途径,有利于软锰矿冶炼节能减排工作的实施。实验研究微波辅助生物质还原电解二氧化锰(EMD)和软锰矿的动力学行为。在微波功率800 W、C6H12O6/EMD质量比1∶1、H2SO4/MnO2摩尔比2∶1、H2SO4浓度1 M的条件下,研究了不同温度下锰浸出率与时间的关系。结果表明:EMD浸出遵循反应核收缩模型。同时,实验还对氧化锰矿、EMD的浸出过程。研究发现,氧化锰矿与EMD的浸出过程并不相同。氧化锰矿浸出过程为化学反应和扩散控制步骤。随温度的升高,浸出过程控制步骤由化学反应控制逐渐转为扩散控制。     

氧化锰矿湿法还原技术研究进展

低品位氧化锰矿因无法直接酸浸，也不适宜采用传统火法还原，未能得到高效资源化利用，因此研究从低品位氧化锰矿中高效还原提锰具有重要意义。综述了氧化锰矿湿法还原技术的研究进展，重点总结了两矿加酸法、硫酸亚铁法、双氧水法、微生物浸出法、生物质还原浸出法和二氧化硫还原浸出法的优缺点，展望了湿法提锰的发展方向。     

电解金属锰生产过程中一氧化锰物料的稳定性研究

采用氧化锰矿为原料还原得到一氧化锰物料,当酸矿比为0.6以上,温度达60℃,液固比为6-8时,锰浸出率可达到90%以上。不同搁置方式对一氧化锰物料的稳定性影响很大,在不搅动的条件下搁置50 h,一氧化锰物料没有明显的氧化,但在冷却过程中加以搅动,还原好的物料很快发生氧化,锰的浸出率降至70%以下。     

低酸、低浓度硫酸亚铁酸性浸出氧化锰矿的研究

在锰电解生产的自然条件下，通过实验及数据对一种全湿法浸出低品位氧化锰矿浸出过程的主要影响因素作出分析和讨论，寻求一条运行成本低、环境友好、生产实际可行的浸出路径。     

分段浸出氧化锰矿和碳酸锰矿工艺研究

对氧化锰矿与碳酸锰矿浸出相结合的分段浸出工艺进行研究。考察硫酸浓度、葡萄糖用量、反应温度、时间和液固比等对两段锰浸出率及浸出液余酸的影响。结果表明,在还原浸出氧化锰矿阶段,采用葡萄糖占氧化锰矿的质量比6.33%、硫酸浓度4.37 mol/L、液固比1.5、90℃反应3h,锰浸出率为93.7%;在第二浸出阶段,加入剩余阳极液及1.5倍氧化锰矿质量的碳酸锰矿,在液固比6、90℃继续反应3h时,总锰浸出率达96.1%,浸出液余酸值降为9.4g/L。     

化学浸出银锰矿的研究

在酸性介质中，应用苯胺直接还原氧化锰工艺处理银锰共生氧化锰矿，使银锰分离。试验确定处理银锰矿浸出条件。在最佳工艺条件下，锰的浸出率达９９％以上，银的浸出率达９５％以上。     

氧化锰矿还原浸出研究

研究了黄铁矿、锰矿粒度、酸矿比对锰浸出回收率的影响．高品位、细粒度的黄铁矿对锰浸出率的提高有显著作用．为提高锰的浸出率，提出了锰矿中浸、酸浸二段浸出流程．此外还探讨了黄铁矿还原氧化锰矿的反应机理．     

高含铁南非氧化锰矿浸出除钾钠试验研究

高纯硫酸锰行业采用氧化锰矿还原焙烧后浸出制取硫酸锰溶液,通常在除钾钠过程中需要额外加入大量的硫酸亚铁,成本较高。本文中介绍采用含铁量较高的南非氧化锰矿焙烧后浸出的试验,在除钾钠过程中不额外添加硫酸亚铁,仅利用矿石中含铁成分进行溶液中钾钠的去除,试验表明除钾钠效果良好,滤液钾含量2.4mg/l,钠含量5.4mg/l。     

氧化锰矿化学浸出新工艺的研究

研究了在钛废液中加入Ｈ２Ｏ２来补充配齐ＦｅＳＯ４还原剂量，提出二段氧化还原浸出氧化锰矿新工艺。浸出结果表明，锰的浸出率达９３％以上。     

硫铁矿-木炭湿法浸出高铁氧化锰矿的研究

针对两矿法浸出高铁氧化锰矿存在生成大量单质硫并覆盖在矿物颗粒表面,降低了反应速率的问题,研究采用在浸出过程中添加木炭粉的方法吸附单质硫以改善浸出效果。考察了木炭粉添加量、硫铁矿用量、硫酸浓度、浸出温度和浸出时间对高铁氧化锰矿中锰浸出率的影响。在高铁氧化锰矿用量10.0g、硫铁矿用量5.0g、木炭粉添加量0.1g、硫酸浓度1.36mol/L、浸出温度70℃和浸出时间4h的条件下,锰浸出率达到96.7%。     

氧化锰矿和硫化铜矿酸浸生产海绵铜与化学二氧化锰的研究

氧化锰矿粉在酸性水溶液中有很强的氧化性，锰难以直接溶出，为达到溶浸目的，应有电极电位较低的还原剂存在。作者就氧化锰和硫化铜矿粉直接酸浸制取海绵铜和化学二氧化锰（ＣＭＤ）新工艺进行了试验探讨     

响应曲面法优化木薯渣—硫酸浸取软锰矿工艺的研究

探究木薯渣为还原剂在硫酸存在下浸取软锰矿中锰工艺条件,通过单因素试验和响应曲面试验,考查了木薯渣用量、液固比、硫酸浓度、温度以及反应时间对浸出结果的影响,实验表明:在取10g软锰矿进行试验时,浸锰最佳工艺条件为木薯渣用量5 g,硫酸浓度为3 mol/L,反应时间为150 min,温度是80℃,液固比为10∶1,其浸出率达到94.08%。     

苯胺还原氧化锰矿物的低温直浸提锰试验

在酸性溶液中用苯胺作还原剂于室温下直接浸出氧化锰矿．锰的浸出率受还原剂量、浸出时间及矿浆液固比等因素的影响较为显著．在适宜条件下，矿石中的锰几乎可以完全被浸出到溶液中．试验还探讨了利用复合还原剂以降低费用的可能性．该工艺具有流程简单、易于实现工业化、锰的提取率高、能耗低、投资省等优点．     

低品位氧化锰矿酸浸制备硫酸锰

研究一步法还原浸出低品位氧化锰矿制备硫酸锰工艺。使用亚硫酸盐作为还原剂,采用黄铁矾法除铁,硫化盐法去除重金属离子,最终制备出适用于电解的硫酸锰溶液。结果表明:矿样10g,硫酸用量6mL,亚硫酸钠用量6g,90℃浸出100min,可以获得的96.42%锰浸出率;控制中和调浆终点pH=2.5,铁浸出率0.02%;控制除杂终点pH=4.5时,滤液达到合格电解液的标准。     

采用软锰矿氧化除镍铁浸出液中Fe2+的研究

研究了采用软锰矿氧化铁矾法除镍铁浸出液中大量Fe2+的工艺过程,主要考察了硫酸初始浓度、硫酸钠加入量、反应温度、浸出时间等因素对锰浸出率及沉铁率的影响,确定了最佳工艺,并对镍锰的分离方法做了简要说明。     

Reductive leaching of pyrolusite ore by using sawdust for production of manganese sulfate

Manganese compounds, such as manganese sulfate, can be obtained from pyrolusite, a manganese ore. Low-grade manganese ores is usually treated by hydrometallurgical methods. In this study, the leaching and recovery of manganese from pyrolusite ore in sulfuric acid solutions containing sawdust as reducing agent was investigated. The effects of experimental parameters, such as sulfuric acid concentration, sawdust amount, solid-to-liquid ratio, stirring speed, particle size, reaction temperature, and leaching time, on the manganese extraction from ore were examined. The results showed that the leaching rate of pyrolusite ore increased with an increasing sulfuric acid concentration, sawdust amount, stirring speed, reaction temperature and leaching time, and decreasing in solid to liquid ratio and particle size. The kinetic analysis of leaching process was carried out, and it was determined that the reaction rate was controlled by diffusion through the product layer under the experimental conditions in this work. The activation energy was found to be 22.35 kJ mol^?1. Manganese can be recovered as manganese sulfate by the evaporative crystallization of the purified leach liquor.     

Kinetics of manganese reduction leaching from weathered rare-earth mud with sodium sulfite

The kinetics of manganese reduction leaching in an acidic medium from a weathered rare-earth mud (WREM) were investigated. Using sodium sulfite as a reductant, the effect of reaction temperature, mechanical agitation rate, sulfuric acid dosage, and feed particle size on leaching kinetics were examined. The leaching process can be described by the shrinking-core model. An apparent activation energy of 11.5 kJ/mol for manganese reduction leaching is estimated. The diffusion of reactants and leaching products through a porous ore matrix was found to be the rate-limiting step. An empirical equation relating the manganese leaching rate constant with feed-particle size and leaching temperature was established. It was found that the smaller the feed-particle size or the higher the leaching temperature, the faster the leaching proceeds, as anticipated. The kinetic process exhibited a self-catalysis characteristic of Mn²⁺ in the mud. This finding suggests that Mn(III,IV) in the mud was rapidly reduced to Mn²⁺ during the initial stage of leaching.     

Dried leaves — Novel reductant for acid leaching of manganese ore

In the present investigation results on the use of dried leaves as a reductant for manganese ore leaching is reported. A complete flow-sheet consisting of steps such as reductive acid leaching, enrichment of leach solution by recycling, iron removal and crystallization has been developed for the preparation of manganese sulphate monohydrate from manganese ore of Gujarat Mineral Development Corporation (GMDC), Ahmedabad, India. During leaching effects of pulp density, amount of acid, temperature, particle size of ore and reductant to ore ratio were studied. Almost total manganese extraction could be achieved under the following conditions: leaching time 8h, H₂SO₄ 5% (v/v), pulp density 10% (w/v), temperature 950C and dried leaves to ore ratio 0.5. Mn enriched (> 90 g/L Mn) leach liquor was obtained by recycling the leach solution twice. The solution so obtained was purified by pH adjustment using lime slurry. A schematic flowsheet for the preparation of manganese sulphate monohydrate crystal is given.     

锰银矿的化学浸出工艺研究

介绍了采用先锰后银浸出和锰银同时浸出两种工艺处理锰银矿石的结果．采用前一种方案获得了锰浸出率大于９６％、银浸出率大于８５％的好指标；采用后一种方案获得了锰浸出率大于９６％、银浸出率大于７９％的结果。最后对两种浸出工艺进行了对比。