银锰矿中锰的铁屑还原浸出工艺研究

某银锰矿中银品位3.15×10-2%,锰品位为13.28%。锰矿物主要为硬锰矿和软锰矿。90%以上的银以类质同象形式存在于锰矿物中,锰银分离是回收银的关键。用铁屑作还原剂,在酸性条件下以湿法浸出可将锰银分离。当磨矿细度小于0.074 mm占80%,铁屑与矿石质量比1∶13,酸与矿石质量比0.6∶1,液固体积质量比3∶1,室温下浸出60 min时,锰的浸出率大于97.60%,而银留在渣中,较好地实现了锰银分离。     

贫锰矿和锌精矿同时浸出工艺研究

研究了贫锰矿与锌精矿同时浸出及以硫磺形式回收硫.通过试验,得到贫锰矿浸出锌精矿的最佳工艺条件为:始酸质量浓度150 g/L,温度90～95 ℃,液固体积质量比7∶1,贫锰矿过量1.5倍,硫酸过量1.5倍,浸出时间4 h.在此条件下,锰的一次浸出率为85.2%,锌浸出率为83.0%.     

硫酸亚铁还原银锰矿提取银的工艺研究

银锰矿是一种重要的含银矿物资源，综合回收其中的有价金属有重要的意义。文章研究了硫酸亚铁还原-氰化两段工艺处理银锰矿回收贵金属银，考查了浸出过程中主要因素的影响，在最佳条件下得出了锰的浸出率达98％和银的浸出率达91％的结果。     

盐酸法富集低品位锰矿及酸介质高值再生工艺

针对印度尼西亚某低品位锰矿,提出盐酸法富集与酸介质高值再生的工艺。借助X射线衍射分析,光学显微镜和电子显微镜等表征方法进行工艺矿物学分析。结果表明:该锰矿矿物组成简单,主要由方解石、软锰矿和少量菱锰矿、褐铁矿、高岭石等组成。筛析结果显示该锰矿粒度越小,锰含量相对越高。粗碎后以2 mm筛孔的筛子过筛可得到锰质量分数为33.32%的锰中矿。锰中矿盐酸直接浸出的最佳条件为:浸出pH 3.0、浸出时间1.5 h、搅拌转速200 r·min?1、液固比4∶1 mL·g?1,此条件下产出的锰精矿品位为54.50%,钙质量分数为0.57%。常温下盐酸再生可产出二水硫酸钙晶须,其长径比可达50以上。再生盐酸返回浸出锰中矿,产出的锰精矿品位为52.16%,钙质量分数为1.39%,验证了该工艺流程的可行性。X射线衍射分析、扫描电镜及能谱分析结果显示产出的锰精矿主要组成成分为软锰矿,杂质为少量褐铁矿、高岭石等。酸介质循环时杂质将逐渐积累,当镁离子质量浓度积累到96.74 g·L?1时,采用水解沉淀法进行除杂。      

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。     

混合原生锰矿浮选试验研究

针对福建某含铅银高硫复杂难处理混合原生锰矿特性,采用依次优先浮选工艺流程,即将原矿磨至-0.074 mm粒级占80%后,经一粗三精二扫获得铅银精矿,铅银循环尾矿经一粗二精二扫获得硫化锰精矿,硫化锰浮选尾矿作为碳酸锰精矿销售,实现了该混合原生锰矿的资源综合回收和无尾矿排放。实验室小型闭路试验获得铅银精矿含铅25.23%、含银1 183.28 g/t,铅回收率74.98%、银回收率27.81%;硫化锰精矿含锰54.75%、含硫30.23%、含银65.23%,锰回收率66.20%,银回收率54.18%;碳酸锰精矿含锰23.43%、含硫0.66%,锰回收率33.50%的较好指标。     

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。     

锌冶炼渣中有价金属回收工艺研究

回收利用锌冶炼渣中有价金属,对冶金行业可持续发展具有重要意义。某锌冶炼渣中锌、铅、金、银含量较高,试验采用酸浸—碱浸—氰化浸出湿法梯级浸出工艺回收锌、铅、金、银。试验结果表明：在硫酸质量分数20%,液固比2∶1,浸出温度80℃,浸出时间2 h的条件下,锌浸出率为90.31%;在氢氧化钠质量分数10%,液固比2∶1,浸出温度80℃,浸出时间2 h的条件下,铅浸出率为93.37%;在氰化钠质量分数0.20%,液固比2∶1,浸出时间16 h的条件下,金、银浸出率分别为82.61%、92.39%。该湿法梯级浸出工艺实现了锌冶炼渣的综合回收。     

广西某低品位碳酸锰矿选矿试验研究

针对广西某低品位碳酸锰矿嵌布粒度细、单体解离困难、铁硅含量高、以菱锰矿为主等特点,经研究,试验采用湿式强磁选法回收该锰矿。在磨矿细度-0.074 mm占75%、粗、扫选磁场强度1.35 T、精选磁场强度1.07 T条件下,进行一粗一精一扫强磁选试验,实验室小型闭路试验可获得锰品位15.53%、锰回收率77.79%的锰精矿;扩大连续试验可获得锰品位15.57%、回收率76.18%的锰精矿。     

微细粒贫锰矿选矿回收工艺研究

采用磁选、浮选工艺流程对连城锰矿微细粒锰矿泥进行了选矿回收工艺研究。试验结果表明:含锰6.83%的微细粒锰矿泥采用单一磁选选别获得了精矿锰品位22.49%,锰回收率64.12%的选别指标。采用磁选-浮选工艺选别,获得了精矿锰品位40.15%,锰回收率43.14%的选别指标。     

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     

China is Planning to Raise rare Earth Resource Tax Again

正In the face of the current situation of the lost WTO dispute on rare earth,and cancellation of export tariff for partial rare earth products,efforts of regulation and integration on rare earth by the state government will again be tightened.Reporters of the Economic Information Daily recently learned from authoritative sources that relevant ministries are     

Refined Copper Production by Province or City in 2014

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Aluminium Production by Province or City in 2014

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Fabricated Copper Production by Province or City in 2014

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Refined Copper Production by Province or City in 2014

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Aluminium Production by Province or City in 2014

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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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