广西大厂矿田原始资料的数据化管理及信息系统的开发研究

本文主要讨论了利用数据库技术和网络技术实现对大厂矿田海量地质原始资料的数据化管理,在对原始资料进行分类整理和数字化录入的基础上,着重论述了大厂矿田地质矿产资源数据库的建立和中央资源数据库管理信息系统的设计与实现。     

中碱度条件下乙氧羰基硫脲浮选分离铜硫

对乙氧羰基硫脲和丁黄药组合捕收剂方案浮选德兴铜矿进行了小型和工业试验研究.结果表明,与丁黄药单一捕收剂方案相比,组合捕收剂方案可使石灰用量降低2/3,实现铜铁混合精矿在pH值为10.5左右的高效浮选分离,显著提高矿山铜、金和钼的回收率.采用普遍化微扰理论和密度泛函B3PW91/6-31G(D)计算对上述实验结果进行了理论分析.ECTU的反应中心为硫代羰基中的硫原子,ECTU的最高占据分子轨道与次最高占据分子轨道的能量接近,主要由硫代羰基中的硫原子组成.ECTU的最低未占据分子轨道由官能团-O-C(=O)-N-C(=S)-N-中各原子的pz轨道组成,为一大π键,具有强烈接受和分散电子对的能力.ECTU易与表面电子组态为(t2g)6(eg)3Cu(Ⅱ)或t6e4 Cu(Ⅰ)的硫化铜矿物形成正配键和反馈键,而难与表面电子组态为(t2gа)3(egа)2 Fe(Ⅲ)或(t2g)6Fe(Ⅱ)的硫化铁矿物作用.UV和FTIR光谱结果进一步证实了ECTU对铜矿物具有优异的捕收能力,对硫矿物具有较好的选择性.     

Effect of N-substituents on performance of thiourea collectors by density functional theory calculations

Using density functional methods, some properties were studied such as the energies and compositions of frontier molecular orbitals and the atomic charges, which are related to the reactive behavior of thioureas containing different N-substituent groupings. The calculation results indicate that the N-substituent groupings have significant effect on the flotation performance of thiourea collectors. The order of electron-donating ability is N-propyl-N′-benzyl-thiourea (PBZYTU)＞N-propyl-N′-ethyl-thiourea (PETU) ＞N-propyl-N′-allyl-thiourea (PALTU)＞＞ N-propyl-N′-acetyl-thiourea (PACTU) ＞N-propyl-N′-ethoxycarbonyl- thiourea (PECTU) ＞N-propyl-N′-benzoyl-thiourea (PBZOYTU), and the order of feedback-electron-accepting ability is PBZOYTU＞PACTU＞PECTU＞＞ PALTU＞PETU＞PBZYTU. This implies that PBZOYTU, PACTU or PECTU can react with copper atoms having (t2g)6(eg)3Cu(II) or t6e4Cu(I) configuration on the surfaces of copper sulfide minerals through normal covalent bond and back donation covalent bond, and exhibit excellently collecting performance for copper sulfide minerals. These are consistent with the experimental data reported in the literatures.     

Geochemical characteristics and genesis of volcanic and sub-volcanic rocks from porphyrite-type iron deposits in Ningwu metallogenic province,eastern China： Constraints from elements

Ningwu porphyrite-type iron deposits are located in Ningwu Mesozoic volcanic basin,which belongs to the middle and lower reaches of the Yangtze River metallogenic province.The volcanic rocks can be divided into Longwangshan,Dawangshan,Gushan and Niangniangshan Formations from early to late.All these volcanic rocks are rich in alkali,and show the similar patterns in rare earth element（REE） distribution.However,some differences can be found in the trace elements and REE patterns.The study of petrology and REE geochemical characteristics shows that these rocks are derived from the underplating of the lithospheric mantle and are contaminated by crustal materials,undergo AFC process during the magmatic evolution.     

基于小波变换的时-能密度法优选微差延期时间

在微差爆破工程中,能否顺利实施微差爆破的关键在于确定合理的微差延期时间。首先,利用基于小波分析的时-能密度法,通过从实测爆破震动信号中识别出各段雷管实际的起爆时刻点,得到了爆破中所用雷管的实际延期时间。其次,利用信号时-频转换技术,从实测微差爆破震动信号中分离出各分段震波。最后,通过比较各分段震波在不同延期时间下的叠加效果,可以得到微差爆破的较优延期时间。以某地下工程爆破震动信号进行分析为例,对本方法的有效性作了检验。该方法具有较高的理论和应用价值,为系统开展爆破震动危害控制和预测研究奠定了理论和技术基础。     

Petrological characteristics,geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province,China

The alkali-rich rocks,spreading along the suture zone of Jingsha River,refer to the alkali-rich porphyry rocks,which emplace during the Himalaya epoch in northwest of Yunnan Province,and consist of syenit,syenit porphyry,monzonite porphyry and granite porphyry.Petrological chemical analysis results suggest that silica is poor and aluminum is rich,and high potassium large ion lithophile elements(LILE),light rare earth element(LREE) and Sr are obviously detracted in these rocks.High field strength elements(HF...     

基于小波变换的微差爆破震动信号分离法

采用震波叠加模拟法确定合理的微差延期时间,关键在于能否获取组成实测微差爆破震波的分段震波。基于小波变换的微差爆破震动信号分离法能较好地解决上述问题。首先,利用基于小波分析的时-能密度法,通过从实测爆破震动信号中识别出各段雷管实际的起爆时刻点,得到了爆破中所用雷管的实际延期时间。其次,利用信号时一频转换技术。从实测微差爆破震动信号中分离出各分段震波。最后,通过比较各分段震波在不同延期时间下的叠加效果,可以得到微差爆破的较优微差延期时间。以某地下工程爆破震动信号进行分析为例,对本方法的有效性作了检验。     

沉积旋回的地震时频特征、地震分形特征和地震灰色特征研究

层序地层学研究中划分沉积旋回是一个十分关键的问题。地震时频分析方法在沉积旋回划分中发挥着积极的作用,但是在实际应用中也暴露出多解性。本文设计了正旋回和反旋回的理论模型,并合成计算了其地震响应。通过对地震响应的计算发现,正旋回分维值小于反旋回的分维值。通过对正放回和反旋回的地震响应进行GM(1,1)建模发现,正旋回的灰色参数A。值大于反旋回,正旋回的灰色参数B。值明显小于反旋回。这一明显的差别,为识别沉积旋回又增加了一个新的参数。综合使用地震时频特征、地震分维特征和地震灰色特征可以提高识别沉积旋回的准确性。     

广西大厂锡多金属矿床中铟的富集规律

详细论述大厂锡多金属矿床中地层和矿石的微量元素和主要金属元素与铟的关系,岩浆岩、近矿围岩和矿石的稀土元素特征与铟的关系以及铟与成矿温度之间的关系。微量元素分析结果表明:在赋矿地层中铟的含量较高,且不同岩性之间的铟含量变化较大,而在矿石中铟与锡和镉均呈正相关关系,与锌呈负相关关系。稀土元素分析结果表明,在岩浆岩中铟含量与δEu成负相关,在近矿围岩中铟含量与δEu呈正相关,在矿石中铟含量与δEu、LREE/HREE、(La/Yb)N关系密切,而且铟在相对氧化、弱碱性的高温阶段更易于富集。最后对大厂锡多金属矿床中铟富集的有利部位进行了预测。