采用硫酸化焙烧—水浸工艺从锂云母精矿中提取锂

研究了采用硫酸化焙烧—水浸工艺从Li_2O品位3.23%的锂云母浮选精矿中回收锂,考察了焙烧过程中硫酸质量浓度、酸矿体积质量比、焙烧温度、焙烧时间,浸出过程中液固体积质量比、浸出温度、浸出时间对Li_2O浸出率的影响。结果表明:在硫酸质量浓度1 127 g/L、酸矿体积质量比1.5/1、焙烧温度150℃条件下焙烧12 h后,对焙烧渣在液固体积质量比3/1、室温下浸出40 min,Li_2O浸出率达98.39%,浸出效果较好。     

某黏土型锂矿中锂浸出试验研究

贵州某锂绿泥石为典型黏土型锂矿，以该矿石为研究对象，对其进行焙烧—浸出试验研究。考察磨矿细度、焙烧温度、焙烧时间、浸出温度、浸出时间、振荡频率及浸出液固比对锂浸出率的影响。研究结果表明：在磨矿细度为-0.038 mm占89%,硫酸用量为0.8 kg/t、焙烧温度为400℃、焙烧时间为1 h,浸出温度为80℃、浸出时间为1 h、振荡频率为150 r/min、浸出液固比4∶1的条件下，锂浸出率为97.31%,浸出效果较好，对该锂绿泥石开发利用具有重要意义。     

黏土型锂矿中锂的浸出实验研究

黏土型锂矿是一类重要的锂资源,目前关于该类锂矿的研究相对较少。采用氯化铁溶液对碳酸盐黏土型锂矿中的锂元素进行浸出,研究了焙烧温度、氯化铁质量分数、浸出温度和反应时间对锂浸出率的影响。结果表明,氯化铁溶液对样品中的锂元素有较好的选择性浸出作用。当焙烧温度为600 ℃,氯化铁质量分数为15%,浸出液固比为5 mL/g,浸出温度为80℃,反应时间为240 min,转速为240 r/min时,锂浸出率可达82.78%。浸出前后样品的XRD和SEM分析表明,锂的浸出可能是氯化铁溶液中的铁离子与黏土样品中的锂离子进行交换的结果。     

氧化焙烧—酸浸法从铜浮渣中提取铜

采用氧化焙烧—酸浸法从铜浮渣中提取铜,重点考察了液固比、硫酸浓度、反应时间和浸出温度对铜浸出率的影响。结果表明,在下述最佳工艺条件下,铜浸出率可以达到99.35%:750℃氧化焙烧2h、液固比5、硫酸浓度20%、90℃浸出2h、搅拌转速300r/min。     

氯化焙烧—水浸从锂云母精矿中提锂试验

采用氯化焙烧—水浸的方法从某Li₂O品位为3.23%的锂云母浮选精矿中回收锂,考察了焙烧过程中氯化剂用量、焙烧温度、焙烧时间,浸出过程中液固比、浸出温度、浸出时间对Li₂O浸出率的影响。结果表明:在CaCl₂用量为锂云母精矿质量的3/4,焙烧温度900℃,焙烧时间40min,焙烧渣在液固比3∶1,室温浸出40min的条件下,Li2O浸出率可达到95.36%,回收效果较好。     

从净化钴渣中富集Co的工艺研究

以某冶炼厂湿法炼锌产生的净化钴渣为研究对象,采用酸浸分离锌、钴,碱浸脱硅,焙烧去除有机物以实现钴元素的富集。研究了硫酸浓度、浸出温度、浸出时间等因素对Zn和Co浸出率的影响。结果表明：在硫酸浓度为100 g/L、浸出温度60℃、浸出时间2 h、液固比10:1的条件下,Zn、Co的分离效果较好;酸浸后净化钴渣在温度80℃、氢氧化钠浓度80 g/L、碱浸时间为60 min、液固比10:1的条件下,脱硅率可达到98.34%;在800℃焙烧2 h得到的含钴焙砂的含量可以达到61.77%。     

石煤流态化焙烧—酸浸提钒工艺研究

采用流态化焙烧—酸浸工艺从某含钒石煤中提钒,考察了流态化焙烧参数和浸出参数对钒浸出率的影响。结果表明,在焙烧温度750℃、焙烧时间15min、助浸剂氟化钙用量5%、硫酸体积浓度15%、浸出温度98℃、浸出时间6h、液固比1.5∶1的条件下,钒的浸出率可达83.90%。     

高温合金酸浸渣氧化焙烧—碱浸工艺研究

采用氧化焙烧—碱浸工艺提取某废旧高温合金酸浸渣中的钨。考察了焙烧温度、焙烧时间、氢氧化钠浓度、浸出温度及浸出时间等对钨浸出率的影响。结果表明,在下述最佳工艺条件下,钨浸出率可达98%以上:焙烧温度700℃、焙烧时间60min、氢氧化钠浓度160g/L、浸出温度85℃、液固比3、浸出时间60min。     

从失效汽车尾气催化剂中提取铈和镧的研究

采用硫酸熟化焙烧—酸浸工艺从失效汽车尾气催化剂中提取铈、镧,主要研究了酸料比、焙烧温度、焙烧时间、浸出温度、浸出酸度、浸出时间等对铈、镧浸出率的影响。结果表明,最佳工艺条件为:酸料比0.9,150℃焙烧3h,浸出液固比4∶1,浸出硫酸浓度1.0mol/L,浸出温度60℃,浸出时间4h。此时,铈、镧的平均浸出率分别为85.80%和85.01%。     

高铁铝土矿焙烧/高压碱浸提取镓的研究

采用钠化焙烧—高压碱浸的方法对高铁三水铝石型铝土矿中的镓进行浸出研究,探讨了焙烧过程中的碳酸钠加入量、焙烧时间、焙烧温度,以及高压碱浸过程中温度、NaOH浓度、液固比、时间等对镓浸出率的影响。在下述最优条件下,镓浸出率达到91.25%:焙烧温度1 000℃、焙烧时间60min、碳酸钠配比100%、浸出温度160℃、浸出时间120min、NaOH浓度15%、液固比15。     

磁性锂离子筛的制备及提锂性能研究

在Stober法的基础上采用二氧化硅对Fe_3O_4包覆钝化,使锂锰氧化物在二氧化硅界面生长,陈化、过滤、烘干、煅烧后生成Li_(1.6)Mn_(1.6)O_4@SiO_2@Fe_3O_4纳米锂离子筛前驱体。酸浸抽锂后得到磁性锂离子筛。SEM结合EDX测试表明,锂锰尖晶石相对均匀地包覆在钝化后的磁核表面,磁性离子筛的平均粒径为18.6nm。在配制的模拟卤水中,H_(1.6)Mn_(1.6)O_4对锂的平衡吸附量是8.78 mg/g,本文制备的H_(1.6)Mn_(1.6)O_4@SiO_2@Fe_3O_4对锂平衡吸附量可达6.01mg/g,除了Mg~(2+)平衡吸附量达到5.213 mg/g以外,其它离子的吸附量都在1.756mg/g以下,说明材料对Li~+的吸附有较好的选择性。用磁性锂离子筛开展反复吸附、脱附试验10次后,其对Li~+仍有良好的吸附效果,平衡吸附量稳定在5.1mg/g,锂解吸率在95%左右。磁性锂离子筛的饱和磁化强度为15.14emu/g,矫顽力为63.02G,可在外加磁场作用下实现与卤水的磁分离。     

磷酸铁锂正极粉选择性提锂

废旧磷酸铁锂电池中，Li具有非常高的经济回收价值。采用无机盐Fe₂(SO₄)₃浸出体系、Fe₂(SO₄)₃-H₂O₂协同浸出体系从废旧磷酸铁锂极片粉中选择性回收锂，考察了浸出剂种类、反应时间、温度、液固比、浸出剂添加量及氧化剂种类等对选择性浸出Li的影响。结果表明：硫酸铁浸出体系液固比5 mL/g,添加1.5倍原料的硫酸铁，在20℃下浸出反应20 min, Li浸出率为91.19%,P浸出率仅为0.02%;硫酸铁-过氧化氢协同浸出体系液固比5 mL/g,反应温度20℃,Fe₂(SO₄)₃添加量为原料的0.6倍，反应20 min后，加过氧化氢调pH至4.1～4.6,Li浸出率可达99.09%,P浸出率为0,Li的选择性浸出效果极好。Fe₂(SO₄)₃-H₂O     

Corrosion of Refractory Alloys in Molten Lithium and Lithium Chloride

Abstract

Several refractory materials have been considered over the years as containment material for lithium and lithium halides. Surface modified refractory metals are being extensively investigated for containment of reactive metals, radionuclides and their compounds. An overview of experimental observations and results of liquid lithium corrosion of selected engineering refractory materials are presented. The nature of the degradation and its mechanism has been explained. The influence of temperature, microstructure, stress, impurities and service time on the corrosion behavior for various refractory alloys have been discussed. Selection rules for materials of containment for liquid lithium and lithium compounds have been suggested. Recent experimental observations on the behavior of tantalum and niobium-based refractory metal alloys in a specific molten salt environment comprising LiCl/Li₂O/Li/Li₃N at 725^°C have been included in an effort to select suitable materials for molten salt equipment. It has been observed that oxygen contamination is particularly harmful for the refractory metal alloys where as nitrogen is deleterious to iron-based alloys.     

磷酸铁锂正极废料选择性提锂制备电池级碳酸锂

废旧磷酸铁锂电池回收对减少环境污染与缓解锂资源压力有重要意义。传统废旧磷酸铁锂电池回收存在锂回收率低、废水处理成本高的问题。通过借鉴Li-Fe-P-H2O系E~pH图及磷酸铁锂电池充放电脱嵌锂的过程，提出采用“过氧化氢+硫酸”体系选择性回收锂。经XRD、SEM检测，提锂后橄榄石型的FePO4结构与原始LiFePO4相结构保持一致，微观形貌的变化也很小。优化条件下Li浸出率达98%以上，同时Fe、P的浸出率在0.1%以下。得到的锂浸出液经净化后成功制备出电池级的碳酸锂。     

Corrosion of Refractory Alloys in Molten Lithium and Lithium Chloride

Several refractory materials have been considered over the years as containment material for lithium and lithium halides. Surface modified refractory metals are being extensively investigated for containment of reactive metals, radionuclides and their compounds. An overview of experimental observations and results of liquid lithium corrosion of selected engineering refractory materials are presented. The nature of the degradation and its mechanism has been explained. The influence of temperature, microstructure, stress, impurities and service time on the corrosion behavior for various refractory alloys have been discussed. Selection rules for materials of containment for liquid lithium and lithium compounds have been suggested. Recent experimental observations on the behavior of tantalum and niobium-based refractory metal alloys in a specific molten salt environment comprising LiCl/Li₂O/Li/Li₃N at 725°C have been included in an effort to select suitable materials for molten salt equipment. It has been observed that oxygen contamination is particularly harmful for the refractory metal alloys where as nitrogen is deleterious to iron-based alloys.     

Central South Lithium Plans to Set up Lithium Carbonate Joint Venture

正Recently, Central South Lithium and Tibet Ngari Prefecture Li Yuan Mining Development Co., Ltd. officially entered agreement in Liyang of Jiangsu, which marks their co-founding a joint venture---Tibet Li Neng Lithium Science and Technology Co., Ltd.(shortened as Tibet Li Neng below), a platform on which the both sides operate their businesses. Tibet Li Neng is going to apply its leading technology of "lithium extraction by electrochemical deintercalation" to dealing with salt lakes including Baqiancuo salt lake.     

我国锂资源分布及提取工艺研究现状

介绍了国内锂资源分布及提取锂的方法,着重介绍了从盐湖卤水中提取锂的研究现状,评价了不同提取工艺。结合我国锂资源状况,预测了锂提取技术的研究方向。