北武夷长寿源银铅(锌)矿床地质特征

长寿源银铅(锌)矿区位于武夷隆起北侧。矿体赋存于震旦系洪山组上段的层间破碎带内,呈层状、似层状产出。矿体沿走向具尖灭再现、膨大缩小特征,剖面上呈似层状、透镜状;矿体厚度变化较稳定,有用组份分布较均匀。矿体产状:倾向177-196°,倾角61-75°,与地层产状基本一致。矿石构造以脉状、网脉状、块状构造为主。矿物成分较复杂,主要有方铅矿、深红银矿、辉银矿、自然银、闪锌矿、黄铜矿、金等。围岩蚀变主要有硅化、绢云母化、黄铁矿化、绿泥石化、碳酸盐化、萤石化、高岭土化等。矿床属于层间破碎带热液充填交代型银铅(锌)矿床。     

云南墨江金矿床成矿作用探讨

云南墨江金矿床位于“三江”褶皱带哀牢山板块结合带北段的墨江 -九甲断裂带中。矿体分布于金厂超基性岩体西侧的金厂组烂山段含火山物质的硅质岩、变余粉砂岩和板岩中 ,矿体由含金石英脉、含金硅质岩组成 ,金矿体受层位和岩性控制。在矿区还分布晚于金矿化形成的镍矿体。金镍矿体共同存在于同一矿区 ,矿区围岩蚀变种类多 ,与金矿化有关的围岩蚀变主要有硅化、黄铁矿化等。矿体的空间分布与穿插关系表明 ,金成矿作用开始于晚三叠世以前。含金硅质岩具有沉积作用形成的地质特征 ,其稀土元素、氧、硅同位素地球化学特征与热水沉积作用形成的硅质岩一致 ;含金石英脉的矿物组成、结构和构造特征、稀土元素、硅同位素、微量元素组成与含金硅质岩相似 ,可能与硅质岩具有相似物质来源或形成作用。金矿石中金与镍、铬等元素的相关性很低。推断金矿床成矿作用可能开始于中石炭世含金硅质岩的热水沉积作用 ,在早三叠世以前 ,成矿热液通过充填和交代作用在硅质岩和上部的岩石中形成含金石英脉。后来的区域变质作用、超基性岩自变质作用及镍矿化作用可能使金矿体的金含量提高 ,但没有产生具有工业意义的独立金矿化。     

银山多金属矿床成矿流体稀土元素地球化学

对江西银山矿床规模不同的矿体、蚀变围岩及其原岩的稀土元素特征进行了对比研究。结果表明 ,成矿流体的稀土元素以轻稀土富集型 ,无Ce异常 ,强烈的Eu正异常而显著地区别于赋矿围岩。热液蚀变作用造成围岩的稀土总量升高 12 .1%～ 5 2 .4%,轻重稀土比值降低 ,但紧邻矿体的稀土含量则低于原岩。导致围岩稀土总量升高有两个因素 :(1)通过热液蚀变作用带入了稀土元素 ;(2 )体系主元素 (Si)质量迁移而造成稀土元素出现表观浓缩。其中以前者为主导因素。矿体的接触带及其紧邻处的蚀变围岩的REE含量明显偏低 ,主要因出现大量石英或石英 +硫化物等矿物的显微脉体 (脉幅 3～ 8μm)而被稀释 ,是一种表观亏损现象。研究结果表明 ,矿体越大 ,其围岩REE被“稀释”越明显 ,涉及的范围越大 ,REE特征可能是一种潜在有效的找矿勘探地球化学指标。     

锰矿砂对取代酚的光氧化作用研究

研究了不同条件下锰矿砂对４种取代酚的光氧化作用。结果表明，ｐＨ＝３．１０±０．０４时，苯酚、对氯苯酚、对氨基酚及对苯二酚均能被锰矿砂光催化氧化。低ｐＨ值，适当的苯酚初始浓度及适当的锰矿砂浓度有利于锰矿砂对取代酚的氧化；离子强度和溶解氧浓度不影响反应速度。对其可能的机理及取代基效应进行了讨论。     

铜陵市硫酸渣的综合利用

铜陵市的硫酸渣经过磁化焙烧—球磨—磁选,可以生产出含铁品位为64.13%、没有硫酸渣任何残余特征的优质铁精矿粉.     

优势降解菌-光照-铁矿粉联用对高浓度2,4,6-三氯苯酚废水的降解特性

研究了Bacillus cereus WTXJ1-16优势降解菌在不同降解时间、接种量、降解温度、初始pH和转速下对2,4,6-三氯苯酚(2,4,6-TCP)的降解特性,初步考察了优势降解菌-光照-铁矿粉联用下对2,4,6-TCP的降解效果。结果表明:浓度为10~8~10~9cfu/m L的WTXJ1-16菌株对初始浓度为100 mg/L的2,4,6-TCP废水的适宜降解条件是接种量为8%(体积分数)、37℃、初始pH 7.5、转速150 r/min和降解60 h。优势降解菌-光照-天然铁矿粉联用实验结果表明,有菌有矿组中光照和黑暗条件下的2,4,6-TCP降解率分别为68.6%和49.4%,比有菌无矿组高出10.3,6.3个百分点,比有矿无菌组高出了60.4,43.0个百分点,说明优势降解菌-光照-天然铁矿粉联用对高浓度2,4,6-TCP废水具有良好降解效果,光照和矿粉对WTXJ1-16优势降解菌具有协同促进作用。     

梭罗沟金矿氧化矿选矿废水破氰处理试验研究

四川省梭罗沟金矿氧化矿选矿过程中产生的氰化尾矿浆水呈较强碱性,COD、CN-、Cu+、Ni2+、Zn2+浓度超出《污水综合排放标准》(GB 8978-1996)一级标准限值,特别是CN+超标515倍.通过加入不同剂量漂白粉,对氰化尾矿浆水进行破氰处理实验,使破氰尾矿浆澄清水呈中性,CN-和各离子浓度均满足《污水综合排放标准》(GB 8978-1996)一级标准,最终得到针对处理梭罗沟金矿氰化尾矿浆水适合的漂白粉用量.     

Exploitation of iron ore tailing for the development of ceramic tiles

India ranks as the sixth largest producer of iron ore in the world. The current practice of washing iron ore in India generates as high as 18 million tonnes of tailings per year. These tailings are stored in massive ponds and pose environmental hazards. Safe disposal or utilisation of these materials thus remains a challenging task for the iron ore industry in India. The present paper describes a new development in managing these tailings by converting them into value added products such as ceramic floor and wall tiles for building application. These tiles have high strength and hardness compared to conventional tiles and conform to most of the EN standards. Energy economy and lower production costs are some other benefits.     

Phosphate removal using aerobic bacterial consortium and pure cultures isolated from activated sludge

In the present study, an attempt is made to evaluate the kinetics of biological phosphate removal using a bacterial consortium of activated sludge, as well as screening for dominant polyphosphates accumulating bacteria. The results showed an efficient phosphate uptake (P < 0.001) of the consortium, with rates related to the initial concentration of both phosphate and carbon sources. Short chain volatile fatty acids presented the suitable substrates for enhanced biological phosphorus removal, of which maximum yield reached 99.23% and 78.51% in basal salt medium supplemented with 0.5% of sodium acetate and lactate respectively. Fifteen phosphate-accumulating bacteria were isolated from the activated sludge and only four isolates were selected and characterized as Pseudomonas aeruginosa AS1, Moraxella lacunata AS2, Acinetobater junii AS3 and Alcaligenes denitrificans AS4. The highest efficiency of phosphate uptake using pure culture was achieved with Ac. junii AS3 (83.36) followed by P. aeruginosa AS1 (81.78%), Al. denitrificans AS4 (76.72%), and M. lacunata AS2 with 50.6%.     

Phosphate removal from domestic wastewater using thermally modified steel slag

This study was performed to investigate the removal of phosphate from domestic wastewater using a modified steel slag as the adsorbent. The adsorption effects of alkalinity, salt, water,and thermal modification were investigated. The results showed that thermal activation at 800℃ for 1 hr was the optimum operation to improve the adsorption capacity. The adsorption process of the thermally modified slag was well described by the Elovich kinetic model and the Langmuir isotherm model. The maximum adsorption capacity calculated from the Langmuir model reached 13.62 mg/g. Scanning electron microscopy indicated that the surface of the modified slag was cracked and that the texture became loose after heating. The surface area and pore volume did not change after thermal modification. In the treatment of domestic wastewater, the modified slag bed(35.5 kg) removed phosphate effectively and operated for 158 days until the effluent P rose above the limit concentration of 0.5 mg/L. The phosphate fractionation method, which is often applied in soil research, was used to analyze the phosphate adsorption behavior in the slag bed. The analysis revealed that the total contents of various Ca–P forms accounted for 81.4%–91.1%, i.e., Ca10–P 50.6%–65.1%, Ca8–P 17.8%–25.0%,and Ca2–P 4.66%–9.20%. The forms of Al–P, Fe–P, and O–P accounted for only 8.9%–18.6%. The formation of Ca10–P precipitates was considered to be the main mechanism of phosphate removal in the thermally modified slag bed.