含锌瓦斯泥资源化回收利用研究进展

含锌瓦斯泥是冶炼行业产生的固体废弃物,含有铁、碳、锌、铅等元素,处置不当不但会引起环境污染,还会导致资源浪费。含锌瓦斯泥常规选矿处理工艺具有工艺简单、运行成本低、易于实施等优点,但锌富集效率较低,难以直接得到合格产品;火法处理工艺具有成本低、流程短、回收率高等优势,但能耗高、对环境污染严重;湿法处理工艺通常可得到较高的浸出率,但工作条件较为恶劣,设备腐蚀严重,易造成二次污染;联合处理工艺可以实现资源综合性回收利用,获得的产品质量高,但工艺过程复杂;微波处理技术清洁、高效,但目前主要在实验室范围内应用,尚未实现规模化工业应用。指出今后应加强瓦斯泥性质和生产工艺适应性的研究,研发新型廉价环保的处理工艺,同时发挥各工艺间的协同作用,加强微波工艺处理含锌瓦斯泥的深入研究与推广应用。     

电炉含锌粉尘在微波场下脱锌的试验研究

微波能是一种清洁型能源，可以对物料进行选择性体加热。利用电炉含锌粉中和煤粉吸收微波能力强的特点，试验研究了微波加热还原电炉含锌粉尘的脱锌效果。结果表明，在大气条件下，脱锌率可达到80％左右；脱锌率随着配煤最、煤粉粒度和微波功率的增加而提高。     

微波碳热还原含锌铅电炉粉尘

利用含锌铅电炉粉尘、焦炭、无烟煤和烟煤吸收微波能力强的特点,采用微波加热方法对配碳电炉粉尘进行碳热还原。结果表明,选用粒度为-0.096 mm的无烟煤为还原剂,在碳氧比为0.9、还原温度为1 100 ℃、保温时间为15 min的条件下,还原产物中铁的金属化率可达90.33%,蒸发脱锌率为96.26%,脱铅率为88.89%。     

含锌渣尘中有价金属回收利用现状与研究进展

为了促进含锌渣尘中有价金属回收利用技术的发展,对资源量大、富含铁酸锌的钢铁厂电炉粉尘和湿法浸锌渣等2类典型二次锌资源,从综合利用原理、技术路线和利用效果等方面进行了评述。指出了矿相重构是实现电炉粉尘和湿法浸锌渣综合利用的有效方法。电炉粉尘主要有价组分为锌和铁,矿相重构处理后宜采取选矿法分离出锌组分,剩余产物应返回炼铁工序,实现在钢铁厂内循环利用;湿法浸锌渣主要有价组分为锌、铁、镓、铟、银等,矿相重构处理后根据元素走向,采取选矿和湿法提取相结合的方法,在不产生二次污染的前提下,重点实现有价元素的综合回收。     

高炉含锌粉尘中铁资源的富集回收

以转底炉工艺技术为基础,采用高温焙烧-磁选分离工艺对济钢高炉含锌粉尘脱锌富集铁进行了实验室研究,考察了还原温度、还原时间及配煤量对含锌粉尘脱锌率、金属化率、磁选精矿产率以及铁回收率的影响。实验结果表明最佳工艺参数为:还原温度1 350℃,还原时间30 min,配煤量4%。在此条件下的脱锌率和金属化率分别为99.75%和99.46%,精矿产率为45.63%,铁回收率为95.76%。     

含锌电炉粉尘配碳选择性还原的实验研究

为实现含锌电炉粉尘选择性还原、有效分离铁和锌资源,采用热力学计算和实验研究相结合,分析电炉粉尘中主要物相的还原分解行为,研究配碳量、反应温度和反应时间对还原产物的影响。结果表明,含锌电炉粉尘配碳选择性还原为铁氧化物和ZnO是可行的;在582~940 ℃之间,可实现铁酸锌的有效分解、ZnO过还原的抑制;随着反应温度增加和反应时间延长,铁氧化物遵循逐级还原规律,配碳量对产物并未产生明显影响;当温度为950 ℃时,ZnO被还原为锌蒸气而挥发,导致产物中锌含量明显降低。在配碳量1/10、反应温度850 ℃、反应时间1 h的优化条件下,ZnFe₂O₄分解率约为70%。     

钒钛磁铁矿综合利用研究现状

钒钛磁铁矿经济利用价值极高,高效绿色开发钒钛磁铁矿资源已成为当今社会发展的必然要求。从钒钛磁铁矿资源分布和综合利用现状等方面进行分析,重点探讨了高炉法、预还原—电炉法、还原—磨选法和钠化焙烧—预还原电炉法处理钒钛磁铁矿的研究现状和工艺优缺点,指出高炉法目前在处理钒钛磁铁矿资源技术领域仍处于主导地位,但高炉法能耗高、环境污染大、资源利用率低,势必会被非高炉冶炼所取代;非高炉冶炼钒钛磁铁矿技术现在尚未完全成熟,仍存在处理量低、能耗高等劣势,需进一步改进完善。并针对以上钒钛磁铁矿利用工艺存在的弊端,提出短流程熔炼新技术,利用该技术处理钒钛磁铁矿可实现铁、钒、钛资源的高效综合利用且生产成本大幅降低。     

白钨矿浸出工艺现状及发展趋势

我国白钨矿浸出工艺包括基于生成难溶性钙盐的碱法浸出工艺、基于生成可溶性钙盐的酸法浸出工艺以及其他浸出工艺。碱法浸出工艺的特点主要是流程短、设备简单、浸出率高、原料适应性强等,但碱法浸出工艺普遍存在能耗大、成本高的缺点,同时均需要在药剂量很大的情况下进行,进而给后续工序带来了一定的困难。酸法浸出工艺主要用于处理高品位、低杂质的优质白钨矿,对钨矿物原料的适应性较差,对原料中的杂质具有严格的要求。酸法浸出工艺的特点主要是热力学反应趋势高,但在分解过程中会产生钨酸膜,进而影响白钨矿的分解效果,此外对设备的腐蚀性较强、对环境污染严重。其他浸出工艺虽然是对碱法和酸法浸出工艺的改进,但大多难以实现工业化。因此,针对目前白钨矿分解工艺的弊端,亟待开发能耗低、操作简单、经济和清洁的白钨资源处理新技术,以期实现我国钨工业资源的可持续发展。     

微波场下冶金含锌尘泥的脱锌效果

研究了在微波场下用C和S iC作还原剂时,氧化锌在精矿粉中的还原率,以模拟钢铁企业冶金含锌尘泥中锌的去除。结果表明:微波处理冶金含锌尘泥,脱锌反应快,效果显著,并且S iC作还原剂时效果较好,得到的氧化锌纯度可达97.7%。因此,微波处理钢铁企业冶金含锌尘泥是可行的。     

新疆某氧化铅锌矿选矿试验研究

新疆某氧化铅锌矿石氧化率高，风化严重，揭铁矿和针铁矿含量高，采用硫化－黄药法浮铅和硫化－胺法浮锌的工艺流程处理这种难选矿石，可获得铅精矿含铅54.82％、含锌7．75％、铅回收率77．06％，锌精矿含锌36．13％、含铅1．85％、锌回收率77．73％的试验指标。     

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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