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。     

焦炭还原焙烧锰矿制备硫酸锰及其机理

以非洲进口锰矿为原料,焦炭为还原剂,进行还原焙烧、硫酸浸出制备硫酸锰溶液。探究焦炭配比、焙烧温度、焙烧时间对锰还原效果的影响,确定最佳工艺参数,并对焙烧反应体系进行热力学分析及对浸出过程进行动力学分析。结果表明,最佳的焙烧条件为：焦炭配比15%、800 ℃焙烧60 min,锰的还原率达到97.84%。焙烧体系反应都是自发进行的,表观活化能为22.4586 kJ/mol,且浸出过程受内扩散控制,动力学方程为：1—2x/3—(1—x)2/3=8.48exp(-22458.6/RT)×t。     

二氧化锰矿磨粉及还原焙烧工艺设计

介绍了以二氧化锰矿为原料,采用单筒干燥机、高压辊磨机、电热回转窑对矿石进行干燥、磨粉、还原焙烧制备一氧化锰焙砂的生产工艺,锰还原率可达到98.5%,并可为后续浸出化合、净化、电解、后处理、蒸发结晶等工序生产电解二氧化锰及高纯硫酸锰产品提供优质原料。     

钛铁矿盐酸加压浸出制备人造金红石试验研究

对典型钛铁矿的化学成分、物相组成和表面结构进行表征,X射线衍射(XRD)分析其结果表明,钛铁矿中主要的物相成分为FeTiO_3。根据钛铁矿的成分特点,采用还原焙烧-盐酸加压浸出法对钛铁矿进行浸出制备人造金红石,研究了预焙烧处理对于铁元素价态及浸出效果的影响。结果表明,弱氧化焙烧和还原焙烧均能够改善钛铁矿的理化性能,强化其浸出效果。最佳的预处理方式为还原焙烧,还原剂用量为8%,焙烧温度900℃,焙烧时间60 min。对于还原焙烧后的钛铁矿进行盐酸加压浸出研究,考察了浸出温度、浸出时间、盐酸浓度、液固比等因素对浸出效果的影响。盐酸加压浸出的最优条件为:浸出温度140℃,浸出时间4 h,盐酸浓度20%,液固比9∶1。此条件下得到的浸出渣煅烧所得金红石TiO_2含量可达93.45%。该工艺流程比较简单,能够有效地实现钛铁矿中杂质的分离,获得高品位的人造金红石产品。     

低品位锰矿制取优质二氧化锰

从低品位锰矿能成功地制得纯二氧化锰。所采用的技术是矿石加硫酸铵进行焙烧,然后浸出可溶性硫酸锰。将纯硫酸锰溶液转化成相应的碳酸盐,最后转化成二氧化锰。对所得产品进行了化学和物理检测。     

硫酸锰生产新工艺的研究

将软锰矿在新型立窑中还原焙烧、隔绝空气快速冷却和热循环利用等新技术,配以球磨、浸出与除杂、固液分离与净化、浓缩与干燥等工艺,生产优质硫酸锰产品。达到了资源利用高效、能源消耗节省、操作工人劳动强度降低、产品质量优质和环境保护得到加强等的效果,实现了对低品位二氧化锰[MnO2≥25%(质量分数)]矿粉综合利用率在90%以上。特别是通过该研究,解决了两矿加酸法和反射炉等老式窑炉焙烧法生产硫酸锰工艺中的很多技术难题和生产成本偏高的经济问题。     

利用钛白副产物浸出软锰矿生产硫酸锰的研究

利用钛白副产物硫酸亚铁作为还原剂,对软锰矿进行浸出还原生产硫酸锰的系统性试验研究。通过分析软锰矿粒度,搅拌速率,浸出时间,液固比,硫化亚铁与二氧化锰质量比,pH值和浸出温度对软锰矿还原率的影响,研究得出软锰矿浸出的优化条件。在该条件下,可获得含99.29%一水硫酸锰的硫酸锰粉末。试验数据的动力学分析显示,在20~80℃的反应温度范围内,浸出过程符合化学反应模型,该浸出过程的计算活化能为59.6 k J/mol。     

生物质燃料粒还原焙烧对水钴矿中钴浸出的影响

研究了用生物质燃料粒还原焙烧水钴矿,再用硫酸浸出钴,考察了水钴矿粒度、生物质燃料粒加入量、还原焙烧温度和时间对还原焙烧产物中钴浸出的影响。结果表明,对于100 g粒度为-200～+325目的水钴矿,配入60目燃料粒10 g,混匀后在350℃下还原焙烧1.0 h,然后用硫酸从焙砂中浸出钴,钴浸出率达99.5%以上,浸出效果较好。     

低品位含磷锰矿脱磷提锰研究

研究还原焙烧和加压氨浸处理某地含磷锰矿的工艺条件,确定了最佳条件,即在锰矿用一氧化碳还原焙烧阶段:焙烧温度为800℃,CO流速为4.2×10~(-3) m/s,焙烧时间为30 min;锰矿氨浸阶段:浸出温度为40℃,氨水浓度为21 mol/L,反应时间为90 min,浸出液固比为6∶1。在此条件下,锰的最高浸出率达91.73%,得到的产品碳酸锰中磷的含量少。     

锌焙砂的选择性还原焙烧硫酸浸出工艺研究

研究了选择性还原焙烧-硫酸浸出两段工艺处理高铁锌焙砂的方法.首先在CO还原气氛下将锌焙砂中的铁酸锌选择性转化为氧化锌和磁铁矿,然后采用硫酸浸出使可溶锌溶出而铁存留于渣中,实现铁锌有效分离.主要考察了还原焙烧以及硫酸浸出的工艺条件对铁锌分离效果的影响,并采用化学分析法及XRD、SEM-EDS的检测手段对焙烧样品进行分析.以可溶性锌和亚铁的含量作为焙烧评价指标,得出最佳焙烧条件为:焙烧温度750℃,焙烧时间60 min,CO浓度8%,CO/(CO+CO2)气氛比例20%,此条件下可溶锌率由原焙砂中的79.64%提高到91.75%;以铁锌浸出率为考察指标,得出最佳浸出条件为∶常温浸出,浸出时间30 min,浸出酸度90 g/L,液固比10∶1,此条件下锌铁浸出率分别为91.8%和7.17%.     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

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