膨润土的酸活化工艺条件优化研究

为探索用天然膨润土制备活性白土的工艺条件,研究了膨润土与硫酸的反应特征,考察了膨润土与硫酸反应过程中Ca^2＋、Mg^2＋、K^＋、Na^＋、Al^3＋离子的变化。实验结果得出膨润土酸活化工艺优化条件为：硫酸浓度,15％～20％：酸化时间,4～6h;酸化温度,80～90℃,该条件下制得的产品可达到国家I类H型一等品的技术标准。     

氨法一步沉淀法制备碱式碳酸锌结晶行为特征

研究了锌氨配离子溶液一步法制备碱式碳酸锌晶体的结晶行为。以锌氨配离子溶液中[Zn²⁺]_T的迁移轨迹为基础, 研究不同工艺参数条件对制备碱式碳酸锌结晶率与晶体粒径的影响。试验结果表明, 蒸氨开始10~50 min为前驱体碱式碳酸锌晶核形成期, 反应温度越高结晶速率越快, 体系中氨的含量越高晶核粒径越小。结晶50 min后, 为晶核生长期, 前驱体晶体粒径快速增大, 温度越高晶体生长速率越快。在80 ℃、搅拌速度400 r/min、Zn²⁺浓度2.6 mol/L的条件下, 蒸氨50 min制得碱式碳酸锌晶核平均粒径为180 nm。此外, 采用匀速滴加碳酸氢铵溶液能减缓碱式碳酸锌晶体生长速率, 晶核平均粒径小于120 nm。     

电气石粉表面改性工艺条件试验研究

用硅油通过化学法对电气石粉进行表面改性，经对比试验可知，达到最佳改性效果时的工艺条件为：pH为9、温度80℃、硅油用量为矿样量的2．5％。     

废黄铜电解制备氧化亚铜粉的研究

研究废黄铜电解制备氧化亚铜粉末的过程，考察电解温度、NaCl浓度、NaOH浓度、电流密度对氧化亚铜产品性能指标的影响。结果表明最佳工艺条件为电解温度70～80℃、NaCl浓度260～280g／L、NaOH浓度0．5～1．0g／L、电流密度500～800A／m^2。在此条件下，可制得符合国标GB1620—79的氧化亚铜含量在95％的-级品。     

烟化炉烟灰制备高等级氧化锌的研究

本文介绍了利用氨法处理杂质成分复杂的某大型冶炼厂炼铅系统烟化炉氧化锌烟灰制备高等级氧化锌的工艺。该工艺采用硫酸铵-氨混合浸出体系,浸出液经过净化后利用蒸氨及复盐沉淀的方法沉锌,得到的氢氧化锌经煅烧制得高级氧化锌。采用该工艺产出的高等级氧化锌的氧化锌含量达到99.7%,并且整个工艺过程简单。     

基于田口方法的分银渣浸铅工艺优化研究

采用氯盐浸出-提纯-结晶-制备黄丹工艺处理分银渣,基于田口方法确定氯盐浸出铅的优化条件,得到工艺参数中影响铅浸出率的主次顺序为: NaCl用量>液固比>温度>CaCl₂用量/理论量。NaCl用量对铅浸出率的贡献率最大,贡献率达到61.82%,是分银渣浸铅过程最重要的工艺参数; 液固比为较重要因素,贡献率为31.27%; 温度和CaCl₂用量/理论量对铅浸出率的贡献率分别为4.95%和1.96%。从分银渣中浸出铅的最优条件为: NaCl用量350 g/L、CaCl₂用量/理论量0.5、温度90 ℃、液固比10∶1,在优化条件下进行3次验证性实验,铅浸出率分别为94.89%、94.75%和95.11%,数值分布稳定,浸出率较高。采用该工艺制备的黄丹纯度为99.12%,产品达到GB 3677-83二级品质量标准。     

从三次氨浸钼渣中碳酸钠氧压浸钼的工艺研究

采用碳酸钠氧压浸出工艺处理氨浸钼渣,研究了原料预处理、碳酸钠用量、氧分压、浸出液固比、时间、温度、搅拌速度对钼浸出率的影响。结果表明：在碳酸钠加入量为化学反应理论量2.3倍,液固比为3∶1,氧分压0.5 MPa,温度180℃,时间1 h,搅拌速度700 r/min的最佳工艺条件下,钼浸出率可达95%以上。     

真空碳热还原氯化法从铝土矿炼铝的实验

考察反应时间、反应温度、还原剂用量对真空碳热还原氯化法从铝土矿炼铝过程的影响。结果表明，真空碳热还原氯化法从铝土矿炼铝的起点温度一定高于1170℃，从1270～1570℃随着温度的升高，金属的直收率有所提高。随反应时闻延长，金属直收率有所增加，但超过120min后，直收率增长缓慢。较适宜的焦炭用量为理论量的1．5倍。     

硫化焙烧法回收高炉含锌粉尘中的锌

以硫磺为硫化剂对某钢铁厂高炉粉尘采用硫化焙烧技术,使高炉粉尘中的氧化锌转变为硫化锌,并用浮选法回收锌。试验主要考察了预热时间、反应时间、反应温度、硫磺用量对锌回收的影响。试验结果表明,最佳工艺参数为：预热温度400℃,预热时间60 min,反应温度750～850℃,反应时间60 min,硫磺用量20％。在此条件下,锌硫化率可达91．59％,经过浮选得到锌精矿品位67．80％,回收率58．84％。     

从铋渣中回收铜铋实验研究

采用硫酸和盐酸两段浸出, 使铋渣中的铜和铋与其他有价金属分离, 再经旋流电解提取浸出液中的铜和铋, 从而回收铋渣中的铜和铋。实验结果表明, 硫酸浸出铜工序中, 在硫酸用量为理论量的3倍、双氧水用量为原料的40%、液固比5∶1、浸出温度70～80 ℃、浸出时间2 h条件下, 铜浸出率达91%; 浸铜后的渣用盐酸浸出铋, 在盐酸用量为理论量的2～3倍、液固比5∶1、浸出温度70～80 ℃、浸出时间2 h条件下, 铋浸出率达98%。对含铜浸出液和含铋浸出液进行旋流电解, 得到含铜99.95%的阴极铜及含铋96.78%的粗铋, 且铜回收率达99.0%, 铋回收率达98.0%。     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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     

2014 second batch of rare earth quota released

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