新型复垦基质的植物生长适应性研究

研究了粉煤灰加城市污泥及酒糟作为矿区复垦基质的可行性,利用盆栽试验探讨紫花苜蓿对于复垦基质的适应性。通过研究基质的主要理化性质以及紫花苜蓿的生长情况,确定新型复垦基质对于紫花苜蓿有较强的适宜性,并且基质和苜蓿体中所含的重金属除镉外都未超过国家标准。     

煤矿塌陷区废碴充填复垦土壤理化性质研究

煤矿区充填复垦重构土壤在很大程度上改变了原生表层土体的构型,为了进一步了解粉煤灰、煤矸石充填复垦对土壤理化性质的影响,通过选取粉煤灰、煤矸石复垦土壤样品与对照土壤样品进行了实验研究,结果表明复垦土壤的理化性质较差。复垦土壤pH值呈碱性,土壤有机质含量降低,土壤全氮、速效磷、速效钾含量减少,土壤湿水分较为充足,风干水分分明显减少。     

高羊茅、早熟禾对新型复垦基质适应性研究

探讨了粉煤灰与糠醛渣混合组配新型复垦基质的利用，通过在室外进行盆栽种植试验。分析高羊茅、早熟禾对新型复垦基质的适应性．结果表明，高羊茅和早熟禾均可在基质中种植，高羊茅最好不覆盖，而早熟禾以覆盖为佳；利用新型复垦基质种植草坪，改善了矿区生态环境。减少了废渣的污染占地．     

粉煤灰和砂壤土混合后水力学特征参数的试验研究

 将粉煤灰与砂壤土按体积比1:2混合后,进行混合物水分特征曲线和渗透系数等水力学特征参数的试验研究,结果表明：两种粉煤灰与砂壤土混合后,均能提升砂壤土的饱和含水量、田间含水量,以及植物有效水含量。因粉煤灰的颗粒组成差异,混合物水分特征曲线在pF值小于1.8时,其形态可能会向上或向下修正。但当pF值大于1.8时,无论粉煤灰的颗粒组成,同一基质吸力的混合物体积含水量均大于砂壤土。当基质含水量较高时,粗颗粒粉煤灰与砂壤土混合物的非饱和渗透系数下降速率较快。研究结果为粉煤灰充填复垦或粉煤灰场覆土复垦地田间水分管理提供理论基础。     

粉煤灰堆场基质-农作物系统中重金属生态风险及健康风险评价

贵州喀斯特山区存有大量燃煤电厂，由这些燃煤电厂产生的粉煤灰在电厂周边山沟峡谷中长期露天堆置，形成了较为平整开阔的山区“坝子”型粉煤灰堆场。周边农户在粉煤灰堆场上直接大面积种植农作物后，堆场耕作层粉煤灰基质和农作物中重金属是否存在相关环境风险、生态风险及健康风险迄今鲜见报道。以贵州某大型粉煤灰堆场上直接大面积种植的不同类型农作物，玉米、辣椒、花生、南瓜、茄子和向日葵及相应粉煤灰基质为研究对象，分析植物经济器官及灰渣中重金属Cd、Cr、Cu、Pb、As含量，并利用污染指数(Pi)、综合污染指数(PN)、生态危害指数(RI)和健康风险指数(HRI)综合评价了样品中重金属的污染水平及其对消费者的健康风险。结果表明：1)堆场基质存在重金属污染的潜在生态风险，其中Cd存在极强的生态风险；2)粉煤灰堆场上种植的花生、南瓜、茄子和向日葵中可食用部分均存在不同程度的重金属污染；3)农作物健康风险评价结果表明，As的重金属风险指数大于1，儿童长期食用通过该粉煤灰堆场基质种植的茄子和南瓜可能带来健康风险。     

菌根真菌对粉煤灰充填复垦中金属元素的利用

针对煤矿废弃物粉煤灰中微量金属元素的利用问题,利用丛枝菌根真菌对矿质元素的调节功能,采用充填复垦盆栽试验,比较不同菌株及其联合作用对植株和基质中微量元素的影响。结果表明：对于宿主而言,接菌能提高对锌、铁、铜的吸收量,同时能抑制有害金属元素铅和锰的过量吸收;菌丝能吸收过量的锰元素;不同充填厚度比较,菌根真菌吸收锌、铁、铜的能力优于根系。对于基质而言,接菌能提高基质中锌、铁、铜和铅含量,降低锰含量;分室中所有接菌处理有效锌、铜、铁的单项丰缺指数都大于对照。接菌处理能够弥补因减小覆土厚度产生的影响,为充填复垦节约成本。     

粉煤灰煤矸石混合浆液性能试验研究北大核心

为探寻粉煤灰煤矸石混合浆液的性质,以粉煤灰和不同粒径的煤矸石为试验材料,采用正交试验方法,通过SPSS软件处理试验数据,分析体积浓度、煤矸石粒径和粉煤灰与煤矸石质量比对浆液的密度、黏度和析水率的影响规律;并结合注浆现场实际,设计黏度降低试验。结果表明:体积浓度、煤矸石粒径、粉煤灰与煤矸石质量比3种因素都对浆液密度和浆液黏度变化起到了显著作用;其中煤矸石质量占比达到70%会使浆液黏度增加变快;体积浓度和粉煤灰与煤矸石质量比对浆液析水率变化起主要作用,其中煤矸石质量在不同占比对析水率的变化快慢有差异,煤矸石粒径对浆液析水率变化起次要作用;聚羧酸减水剂含量增加对粉煤灰浆液和粉煤灰煤矸石混合浆液黏度降低有明显的作用,并随剂量的加大,黏度变化逐渐减缓达到极值。     

粉煤灰改良复垦土壤重金属污染的可拓评价

可拓理论是一个很有价值的复垦土壤质量评价方法,利用该理论研究不同比例粉煤灰中的重金属富集量对改良土壤的污染影响。研究表明,利用粉煤灰改良复垦土壤,不会造成土壤重金属污染,以1%粉煤灰 有机肥处理效果最好。     

粉煤灰充填复垦土壤理化性状研究

为了进一步搞清粉煤灰充填复垦构成的复垦土壤的理化性质，指导今后的复垦工作，通过选取不同时间、不同地点复垦土地的样点，采用室内外测化验手段，对其进行了细致的研究。结果认为：复垦土壤入渗率小于农业土壤，土壤容重和土壤含水量大于农业土壤；复垦土壤PH值大于8，碱性过强，土壤有机质含量低，全氮含量低，速效磷含量低，全钾含量和速效钾含量充足。     

基于粉煤灰基质充填覆土复垦的最佳覆土厚度

为研究粉煤灰充填复垦地种植农作物的经济产量达到最优时的最佳覆土厚度,选择淮南上窑粉煤灰场复垦地为研究对象,选取不同厚度覆土（A：<40 cm;B：40~55 cm;C：55~70 cm;D：>70 cm）的地块采样监测冬小麦的经济产量、根长密度、土壤含水量、土壤pH、土壤N,P,K营养元素含量等指标。实验结果表明：有利于冬小麦生长并得到最佳产量的适宜覆土厚度为55~70 cm,其土壤pH为8.15,N,P,K含量分别为6.272,26.253,143.76 mg/kg。综合评价结果表明该地块的表土具有较好的营养能力,土壤质量较好。     

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 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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Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

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.     

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.