铜镍冶炼渣新型充填胶凝材料制备及其力学性能研究

以铜镍冶炼产生的工业废弃物铜镍冶炼渣为研究对象,通过对冶炼渣进行XRD测试及化学成分分析,确定了冶炼渣基本特性。针对研究所用冶炼渣活性低的特点,基于冶炼渣制备胶凝材料的水化反应机理,选取复合激发剂进行活性激发。按照冶炼渣∶PO42.5水泥∶CaO:激发剂=35∶50∶13∶2配比制备了SC型胶凝材料,并对其性能进行试验检测。结果表明:SC型胶凝材料各龄期强度均比PO42.5水泥强度低,但高于PSA 32.5水泥强度,其强度能够满足矿山充填需求。SC型胶凝材料与尾砂适应性测试试验结果表明,SC型胶凝材料与尾砂制备的充填料浆具有较好的流动性。     

喀拉通克铜镍矿充填胶凝材料基本性能研究

针对矿山存在大量固体废弃物冶炼渣及尾砂的情况,结合矿山充填特点,提出利用工业冶炼废渣等固体废弃物制备新型胶凝材料的技术思路。本文采用XRD对冶炼渣进行物相分析,并结合化学元素分析法进行冶炼渣基本活性分析,结果表明试验用冶炼渣活性较低、活性激发难度较大。根据试验冶炼渣特性,开展不同激发剂对冶炼渣活性激发的可行性试验,并结合试验结果选取适宜的激发剂类型。同时通过粉磨试验确定最佳粉磨时间为40～50min。在此基础上,开展与尾砂的骨料适应性试验及充填体强度测试分析,最终推荐基于冶炼渣与硅酸盐水泥协同制备适用于矿山充填的新型胶凝材料配方。     

超细粒级全尾砂胶固材料开发研究

高炉水淬渣作为钢厂的一种废弃物,具有潜在的胶凝活性,经过物理和化学联合激发的方式激发后,具有较强的胶凝性能,可用作矿山充填胶凝材料。研究用平均粒径仅为11.87μm的超细粒级全尾砂,采用开发的水淬渣胶凝材料(高炉水淬渣∶石膏∶水泥熟料70∶6∶24)胶全尾砂是32.5普通硅酸盐水泥胶全尾砂充填试块单轴抗压强度的2~5倍,显示出良好的适配性,能够满足采矿工艺对充填体强度的要求。水淬渣胶凝材料是一种制造成本低、性能好、来源广、绿色环保的材料,是解决超细粒级全尾砂胶凝难题的有效材料。     

井下膏体充填新材料试验

将炉渣粉、石膏、熟料按不同比例配合,进行膏体试块净浆强度试验,根据净浆强度等级划分炉渣水泥强度,并进行掺合全尾砂的膏体强度试验。结果证实了铅渣开发水泥的可行性。但由于铅渣的胶凝活性较弱,在应用于矿山充填中可采用部分替代普通硅酸盐水泥,可节约充填成本,混合胶凝材料具有较强的胶凝活性,满足矿山充填强度的需要。     

井下膏体充填新材料试验

将炉渣粉、石膏、熟料按不同比例配合,进行膏体试块净浆强度试验,根据净浆强度等级划分炉渣水泥强度,并进行掺合全尾砂的膏体强度试验。结果证实了铅渣开发水泥的可行性。但由于铅渣的胶凝活性较弱,在应用于矿山充填中可采用部分替代普通硅酸盐水泥,可节约充填成本,混合胶凝材料具有较强的胶凝活性,满足矿山充填强度的需要。     

司家营铁矿充填用新型胶凝材料制备中间试验

在前期针对司家营铁矿全尾砂的探索性试验、净浆试验、胶砂试验中,已经初步开发出了激发钢铁厂水淬渣活性的新型胶凝材料。为了进一步检验和验证新型胶凝材料的力学特性,利用中试生产的新型胶凝材料进行了不同胶砂比和不同浓度的胶砂试验,得到了适合司家营铁矿充填的新型胶凝材料。     

鞍钢全尾砂矿渣基充填胶凝材料试验研究

利用芒硝、脱硫石膏、水泥熟料等激发剂充分激发鞍钢水淬渣粉的胶凝活性,开发适用于鞍钢全尾砂的矿渣基胶凝材料。在鞍钢全尾砂物化特性分析的基础上,通过探索性正交试验与极差分析,初步获得满足矿山强度要求的胶凝材料配方。矿渣基充填胶凝材料的开发应用,不仅节约充填材料成本,而且可实现鞍钢铁矿的安全、低能耗开采。     

碱激发粉煤灰基铜尾砂充填膏体试块性能与环境效应研究

为促进矿产资源的可持续利用,保护矿山生态环境,采用一定掺量的碱激发粉煤灰替代水泥制备铜尾砂充填体,通过开展系统的力学、渗透和重金属析出试验,评估了铜尾砂充填膏体试块的强度、抗渗性能和环境效应,结合X射线衍射和扫描电镜结果分析了胶凝材料的矿物组成和充填膏体试块的微观结构特征,揭示了碱激发粉煤灰对充填膏体试块综合性能的影响及其微观作用机理。结果表明,碱激发可以显著提高粉煤灰的活性,在1 mol/L的Na OH碱激发剂作用下,掺量20%的粉煤灰基铜尾砂充填膏体试块经过28 d养护,其抗压强度较水泥胶凝试块提高了17.8%,渗透系数降低了68.0%,综合胶结效果显著;碱激发粉煤灰的掺入减少了铜尾砂充填膏体试块硬化过程中的重金属析出,有助于控制地下水资源的污染;利用粉煤灰的微细颗粒填充效应和复合胶凝效应,可有效降低铜尾砂的孔隙率,并形成新的水化产物,增强尾砂颗粒间的结合力,从而提高材料的强度和稳定性。     

利用脱硫灰烧结渣制备新型充填胶凝材料的试验

烧结脱硫灰渣是半干法脱硫排放的废弃物。灰渣含有亚硫酸钙和飞灰等不稳定矿物成分,使得该废弃物利用面临困难。针对铁矿全尾砂胶结充填法采矿对廉价的胶凝材料的需求,采用烧结脱硫灰渣和水淬渣,开展了制备全尾砂充填胶凝材料试验研究。以生石灰作为碱激发剂,硫酸盐作为辅助激发剂,对矿渣微粉活性实施复合激发。首先采用正交设计进行试验方案设计和方案实施;然后采用极差分析对数据进行处理和配比决策。最后根据阶段嗣后充填采矿对充填体的强度要求,建立并求解全尾砂新型充填胶凝材料的优化模型,获得了充填胶凝材料的优化配比。结果显示,以生石灰和烧结脱硫灰渣作为水淬渣复合激发剂制备的新型充填胶凝材料,烧结脱硫灰渣掺量达到10%时,3,7d及28d的胶结充填体强度不低于相同条件下的以32.5R早强水泥为胶凝剂的充填体强度,而其成本低于水泥材料。     

全尾砂固结粉胶凝材料在东凯铁矿推广应用

利用生石灰、石膏和水淬渣等材料开发全尾砂固结粉(简称矿尾粉)充填胶凝材料已经取得成功。为了在东凯铁矿推广应用,针对矿尾粉在生产和应用中存在的问题,开展矿尾粉充填胶凝材料配方调整与优化试验研究。首先分析了东凯铁矿全尾砂的物化特性,然后,根据矿山充填系统与技术参数,确定胶砂比为1∶6和料浆浓度为66%,完成了以熟料代替生石灰的矿尾粉复合激发剂配方的正交试验。正交分析结果显示,添加增效剂的改进矿尾粉胶凝材料最佳配比为:水泥熟料掺量15%,脱硫石膏掺量为2%,增效剂掺量为0.6%。7d和28d的胶砂充填试块强度分别达到2.13 MPa和5.54 MPa,满足东凯铁矿上向分层开采对胶结体强度的需要,为矿尾粉在东凯矿山的工业化应用奠定基础。     

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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