含富铟铁酸锌锌浸渣中铟的微波强化酸浸

常规酸浸很难高效浸出富铟铁酸锌中的铟,为了探索提高铟浸出率的低耗、高效工艺,以广西柳州锌品厂含富铟铁酸锌的锌浸渣为对象,进行了微波助浸工艺及工艺参数研究。结果表明:微波直接酸浸工艺具有简单、高效的特点,其铟浸出率明显高于常规酸浸和微波预处理+常规酸浸工艺,与微波预处理+微波酸浸工艺的铟浸出率十分接近;搅拌速度、硫酸初始浓度、液固比、浸出温度、浸出时间对铟浸出率均有显著影响;在搅拌速度为550 r/min、硫酸初始浓度为1.5 mol/L、液固比为10 mL/g、浸出温度为75℃、浸出时间为90 min情况下,对锌浸渣进行微波直接酸浸铟,铟浸出率可达77.0%,较常规酸浸铟浸出率高19.9个百分点。     

含铊锌烟灰的选择性浸出研究

在铅锌冶炼渣挥发处理过程中产生含铊锌烟灰，是铊在冶炼中的主要富集物。采用水浸、H₂SO₄浸出和NaOH浸出分别处理锌烟灰，研究了酸碱浓度和浸出温度对锌和铊浸出率的影响。结果表明，水浸时铊浸出率随着温度升高而缓慢提高，在70℃时可达78%左右；酸浸选择性不好，酸浸时酸度和温度提高均会增加锌和铊的浸出率，在硫酸浓度40 g·L-1、温度70℃的条件下铊和锌浸出率分别达79%和85%以上；碱浸铊具有良好的选择性，铊的浸出率随碱浓度增加而提高，在NaOH 40 g·L-1、温度70℃的优化条件下，铊和锌的浸出率分别为91%和1%左右。最终选定碱浸工艺处理含铊烟灰，通过对碱性浸出液的硫化沉淀、硫酸浸出和锌板置换得到纯度为92.84%海绵铊。新工艺实现了对超低铊含量烟灰的资源化利用和开路除铊，具有工艺简捷、选择性好的优点。      

机械活化对铁酸锌浸取行为的影响

研究了细磨和边磨边浸以及浸取时间和温度对工业锌焙砂和含铁酸锌浸渣浸取行为的影响。试验结果表明,细磨和边磨边浸可加快铁酸锌的浸出速度。在磨矿过程中铁酸锌获得机械活化是浸取行为获得明显改善的主要原因之一。将该技术用于处理含锌热酸浸渣可以改善浸取条件,提高锌的浸出率和增加传统湿法炼锌工艺处理含铁高的锌焙砂的适应能力。     

难处理复杂氧化锌烟尘碱洗渣浸出试验研究

对铅冶炼难处理复杂氧化锌烟尘碱洗渣进行了"中性浸出—酸浸"工艺试验研究。结果表明,碱洗渣中性浸出时,锌、镉的浸出率先随浸出温度、液固比、搅拌速度和时间的增加而提高,后增速变缓;中浸渣酸浸时,液固比对锌、铟的浸出率无明显影响。锌、铟的浸出率随初始酸度、浸出温度和时间的增加先增加后变缓。中性浸出最佳条件为:温度338K、液固比5∶1、搅拌速度400r/min、浸出时间1h,此条件下,锌、镉的浸出率分别为80.3%和76.3%。中浸渣酸浸最佳条件为:初始酸度100g/L、浸出时间2h、浸出温度363K、液固比5∶1,在该条件下,锌、铟的浸出率分别为97.1%和85.5%。     

锌中浸渣-硫化锌精矿协同浸出锌、铟的研究

本文在硫酸体系下对锌中浸渣-硫化锌锌精矿协同浸出工艺与锌中浸渣直接热酸浸出工艺进行了对比。实验结果表面：添加锌精矿进行协同浸出能够有效提高锌中浸渣中有价金属锌、铟和铁的浸出率。在实验的基础上,对锌中浸渣-锌精矿协同浸出机理进行了探讨,为协同浸出提供了理论依据。     

锌中性浸出渣还原浸出工艺研究

以锌中性浸出渣为研究对象,针对硫化锌精矿还原浸出与SO2还原浸出工艺开展了实验研究并分析了两种工艺的特点。在还原浸出过程中随着铁酸锌的不断溶解,大量的Fe3+进入溶液导致溶液电位升高,抑制了铁酸锌的分解。通过还原浸出的方法能够有效缓解溶液中高电位对铁酸锌分解的影响从而提高金属浸出率。从元素的浸出行为、还原浸出液成分、还原浸出渣成分、还原浸出渣的处理四个方面对两种工艺进行了分析。研究表明,两种工艺能够有效的将溶液中Fe3+还原为Fe2+促进铁酸锌的溶解,提高有价金属的浸出率,并有利于后续工艺的锌铁分离,能够达到中浸渣的无害化处理和资源化利用。 关键词：还原浸出;中浸渣;铁酸锌     

铜熔炼烟灰中Cu、Zn元素浸出试验研究

在原材料化学成分和物相组成分析的基础上，对微波辅助浸出某铜含量为12.67%、锌含量为9.85%的铜熔炼烟灰中Cu、Zn元素的可行性进行了研究。考察了硫酸浓度、液固比、浸出温度和浸出时间对Cu、Zn浸出率的影响，结果显示，在硫酸浓度为5 mol/L、液固比为10 mL/g、浸出温度80 ℃、浸出时间2 h条件下，铜、锌浸出率分别为95.11%、95.92%。对浸渣分析表明，浸渣主要为残余的碳及铁硅酸盐，铁酸铜、铁酸锌经硫酸浸出后生成磁铁矿，浸渣中部分大颗粒碎裂成较小颗粒，且颗粒表面有裂缝和孔产生，浸渣疏松多孔。     

氯化铵溶液中还原浸出海洋锰结核

采用亚硫酸钠作还原剂对氯化铵溶液中海洋锰结核的浸出行为进行研究，探讨Ｎａ２ＳＯ３加入量、ＮＨ４Ｃｌ浓度及初始ｐＨ值、浸出温度和时间等对锰结核中铜、镍、钴、锰、铁浸出率的影响。结果表明５．０ｍｏｌ／ＬＮＨ４Ｃｌ溶液中，初始ｐＨ值约５．０及８０℃、１８０ｍｉｎ，锰结核与Ｎａ２ＳＯ３等量加入时，铜、镍、钴、锰的浸出率分别为８８．５６％、９６．１４％、７８．５７％、３５．２％，铁几乎未被浸出。而在同样的条件下，控制浸出过程的ｐＨ值４．０左右，１２０ｍｉｎ后铜、镍、钴、锰、铁的浸出率分别为９０．２１％、９８．８０％、９１．４３％、９８．１１％、２０．１３％。     

锌浸渣还原浸出工艺研究

以锌浸渣为研究对象,针对硫化锌精矿还原浸出与SO2还原浸出工艺开展了实验研究并分析了两种工艺的特点。在还原浸出过程中随着铁酸锌的不断溶解,大量的Fe3+进入溶液导致溶液电位升高,抑制了铁酸锌的分解。通过还原浸出的方法能够有效缓解溶液中高电位对铁酸锌分解的影响,从而提高金属浸出率。从元素的浸出行为、还原浸出液成分、还原浸出渣成分、还原浸出渣的处理四个方面对两种工艺进行了分析。结果表明,两种工艺能够有效的将溶液中Fe3+还原为Fe2+,促进铁酸锌的溶解,提高有价金属的浸出率,并有利于后续工艺的锌铁分离,能够达到浸渣的无害化处理和资源化利用。二者相比,SO2还原工艺更可取。     

复杂含砷锑银矿酸性浸出渣湿法提取银的研究

对复杂含砷锑银矿酸性浸出渣提取进行了研究,提出了对浸出渣进行氧化料烧预处理,再转化－浸银的处理工艺,在焙烧温度６５０℃,Ｈ２ＳＯ４体系中转化,Ｎａ２ＳＯ３溶液浸出,甲醛作还原剂,银的浸出率为９４．２５％,银粉品位为９４．３８％。     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

Brief news

正China Minmetals Rare Earth Construction of Jianghua Separation Plant is set to complete at the yearend Civil works of Jianghua Separation Plant have been finished and the company is installing and debugging equipments now.It is estimated that construction of Jianghua Separation Plant will be     

Brief news

正Total transactions of rare earth in Rare Earth Ex-change Center of Hunan South Rare and Precious Metal Exchange neared 40 billion yuan from January to October From the opening in January of this year to the end of October,the total transaction of rare earth products in Rare Earth Exchange Center of Hunan South Rare and Precious Metal Exchange neared40 billion yuan.There are 16 varieties including dysprosium oxide and terbium oxide traded on the exchange center,one of the largest trading platforms for rare earth oxides in China.     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Theoretical basis for optimal collector concentrations and pulp pH values during flotation of sulfide-free minerals

A hypothesis that associates optimal conditions of mineral flotation with a zero charge of their surface is put forward. This hypothesis serves as a basis for a methodology to obtain and verify quantitative physical-chemical models for a minimal necessary concentration of a collector during flotation of sulfide-free minerals. These models may be of use for upgrading engineering processes of flotation and as a job for the concentration plant automation systems. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 89–99, March–April, 2006.