高纯石英原料矿物的选择及提纯方法研究

随着战略性新兴产业的快速发展,高纯石英的重要性越来越引起重视。高纯石英通常注重天然石英矿物的可加工性,其提纯制备受原料性质影响很大。因此通过工艺矿物学研究,明确石英原料中杂质的种类、含量及可选择性是选择合适高纯石英原料和制定提纯方案的关键。本文重点介绍了高纯石英原料矿物的评价选择标准及提纯方法。

四家湾金铜矿石中金的工艺矿物学特征及其对选矿的影响

利用各种方法对四家湾金铜矿石进行了工艺矿物学研究，查明了金的赋存状态和工艺性质，阐明了对选矿有影响的工艺矿物学因素并估算了金的选矿指标，为提高金的选矿回收率提供了新的信息．

页岩气测井评价进展

测井评价在页岩气的勘探开发过程评价中发挥着至关重要的作用,与常规储层相比,页岩气储层的测井评价难度更大。经过大量的关于页岩气的文献调研,综述了页岩气的开发现状以及页岩气储层的地质特征和测井响应特征,概括性地介绍了当今页岩气测井评价的测井系列;总结了页岩气测井评价的任务主要包括矿物组分评价、物性参数评价、地化参数评价、含气量的计算、岩石力学参数的计算以及裂缝识别;给出了页岩气储层测井解释评价的技术和方法,并对页岩气测井评价提出了一些建议和认识。

矿产品价格预测在矿物工程评估中的应用

众所周知，预测矿产品价格对矿区的预期价值具有不可低估的影响，然而，在采矿工程的整个服务期内矿产品价格的波动也影响矿区的预期价值。因此，不仅要评估工程开始时预测的矿产品价格，而且还要有一种方法用以评估整个工程服务期内矿产品价格可能发生的波动。提出了一种简单的方法在矿物工程评估中考虑矿产品价格的波动。

Research and application of mineral resources assessment by weights of evidence model based on SIG

Geological data are usually of the characteristics of multi-source, large amount and multi-scale. The construction of Spatial Information Grid overcomes the shortages of personal computers when dealing with geological data. The authors introduce the definition, architecture and flow of mineral resources assessment by weights of evidence model based on Spatial Information Grid (SIG). Meanwhile, a case study on the prediction of copper mineral occurrence in the Middle-Lower Yangtze metallogenic belt is given. The results show that mineral resources assessement based on SIG is an effective new method which provides a way of sharing and integrating distributed geospatial information and improves the efficiency greatly.

Producing Arabic Bread Enriched with Minerals and Protein

This research aims to produce Arabic bread enriched with iron, zinc, copper, magnesium and protein by the addition of ingredients such as parsley powder, oats, grape seeds, soybean meal, wheat germ, and milk powder. In this study, for enriched bread samples sensory evaluation, chemical and mineral composition determination and microbiological tests were carried out. The sensory evaluation of breads showed that both mixtures, which were enriched with grape seeds, oats, and wheat germs, have excellent quality. The chemical tests showed that the enriched breads have high fat, ash, fiber, and protein when compared with normal Arabic bread. It was noticed that the consumption of three enriched Arabic bread loaves gives us about 78.9% from our daily need of zinc, whereas the unenriched bread gives us only 48.8%, about 82.2% from our daily needs of copper, whereas the normal bread gives us only 58.8%, and 93.9% from our daily need of iron, whereas the normal bread gives us only 71.2%.

Geotechnical and Mineralogical Evaluation of Soils Underlying a Failed Highway Section in South Eastern Nigeria

The Port Harcourt Enugu expressway is part of a national road grid that links parts of southern and northern Nigeria. The severe pavement failure between Umuahia and Okigwe section of the expressway covering a distance of about 30 km was investigated by geotechnical and mineralogical assessment of disturbed and undisturbed samples of the underlying soils. Also vertical electrical sounding was performed at the failed sections. Results indicate that the section is underlain by shales of the Imo Formation, and soils are composed of 27% and 74% sand and fines respectively. The Atterberg limit values are moderate to high, with liquid limit in the range of 49-54%, plasticity index 11.1-24.4% and linear shrinkage 17.86-23.57% respectively. Abrasion test results of 0.58 to 16% indicate shales of low durability. The 24 hour free swell tests results range from 33-70% implying soils of moderate to high hydro-affinity and volume change. These data corroborate the X-ray diffraction analyses results which show montmorillonite and kaolinite as the main clay minerals present in the soils. Undrained cohesion range from 9 to 54 kPa and frictional angle from 13° to 29°. High settlement amounts and field observation of intense failure correlated well with the engineering properties and the clay minerals. The soils indicate mainly MI-MH and A-7-5 soils on the USC and AASHTO classification system respectively, implying poor quality soils as subgrade materials. stabilisation. Result of the study will be useful in remedial works areas underlain by the shales. The engineering properties may be modified and upgraded by on the failed sections of the road and future pavement design in

Cumulative gain and lift charts for model performance assessment in mineral potential mapping

Model performance assessment is a key procedure for mineral potential mapping, but the correspond-ing research achievements are seldom reported in literature. Cumulative gain and lift charts are well known in the data mining community specialized in marketing and sales applications and widely used in customer chum prediction for model performance assessment. In this paper, they are introduced into the field of mineral poten-tial mapping for model performance assessment. These two charts can be viewed as a graphic representation of the advantage of using a predictive model to choose mineral targets. A cumulative gain curve can represent how much a predictive model is superior to a random guess in mineral target prediction. A lift chart can express how much more likely the mineral targets predicted by a model are deposit-bearing ones than those by a random se-lection. As an illustration, the cumulative gain and lift charts are applied to measure the performance of weights of evidence, logistic regression,restricted Boltzmann machine, and multilayer perceptron in mineral potential mapping in the Altay district in northern Xinjiang in China. The results show that the cumulative gain and lift charts can visually reveal that the first three models perform well while the last one performs poorly. Thus, the cumulative gain and lift charts can serve as a graphic tool for model performance assessment in mineral potential mapping.

Evaluating Added Benefits from Combined Cattle Manure and Fertilizer Application in a Maize Cropping System

A field experiment was conducted at Kpongu in the Upper West region of Ghana to determine the added benefits in grain yield of maize derived from the concurrent use of manure and mineral fertilizer, and their cost effectiveness. Factorial combinations of cattle manure and mineral fertilizer each at 0, 50 and 100% of their recommended rates were evaluated in both the field and the laboratory studies. The treatments were applied in a randomized complete block design with three replications on the field. The same treatments were applied in the incubation study in a completely randomized design. The use of 100% NPK （Nitrogen, Phosphorus, Potassium） ＋ 5 t manure gave the highest grain yield of 4,678 kg·ha^-1. Synergistic interactions resulting in added benefits in grain yield were observed in all the combined nutrient inputs except 50% NPK ＋ 2.5 t manure which accrued an added disadvantage of 44 kg·ha^-1. Economic analysis proved that 100% NPK ＋ 2.5 t manure and 50% NPK ＋ 5 t manure were the most economically viable combined treatments in terms of grain yield. Based on the results from this study, resource poor farmers in the Upper West region of Ghana may reduce mineral fertilizer recommended rates by 50% and supplement it with 5 t quality （N 〉2.5%） cattle manure without compromising yield and profit.

Role of Potassium Bearing Minerals in Desorption of Reserved Potassium in Some Soils of Northern Iraq

A laboratory study was conducted in order to explain successive extractions of reserved potassium by using concentrated HCI under reflux for 13 surface and sub-surface soil samples representing three chosen pedons of soil series （472 ECC Bashika, 463 EKC Rabeaa and 461 ECC Talafar） locations of Nineveh Province in Northern of Iraq. The aim is to investigate role of clay minerals on release of reserved potassium from soils. Results showed that dominated clay minerals were （smectite 〉 illite 〉 kaolinite 〉 chlorite） for both 472 ECC and 461 ECC soil series and were （illite 〉 smectite 〉 kaolinite 〉 chlorite） for 463 EKC soil series. Also results appeared that exchangeable K＋ released values were 2,483-4,575 mg/kg at 461 ECC and 463 EKC soil series, respectively; non-exchangeable phase ranged from 752-1,390 mg/kg at 461 ECC and 472 ECC soil series, respectively. Soil fertility was evaluated according to its K＋ mica release referring for high K＋ release content with range between 3,324-5,516 mg/kg at 461 ECC and 463 EKC soil series, but rate ofK~ released was very law according to parabolic diffusion me,del with range from 195-359 mg/kg at latter soil series respectively. Results reflect effect of clay minerals on potassium release as amount and rates in arid and semi-arid regions. It can be concluded the study soils have a high amount of potassium content with low rate release of it, in turn these soil need particular management.

Tribological and economic evaluation of recycled mineral lubricating oils

Seven kinds of used mineral lubricating oils,including hydraulic oils,film bearing oils,steam turbine oil and gear oils,were recycled by reclamation and adding additives.Physical and chemical properties of the recycled oils were measured and their lubrication performances were evaluated by the original and modified four-ball testers.Worn surfaces were analyzed by energy dispersive X-ray spectroscopy and Raman microscope.The recycling costs of burning,re-refined and refortified were estimated.Results showed that physical and chemical properties of the refortified oils were improved effectively and became in the industrial access standard.With the different friction materials under different loads,refortified oils provided excellent lubrication performances,much better than those of fresh oils.Because of additives replenished,the different lubrication films could form on the worn surfaces.A rough financial calculation revealed that the refortification process could produce the most economic value among the three methods.

The quantitative evaluation of application of hyperspectral data based on multi-parameters joint optimization

In order to evaluate the mineral identification of the hyperspectral data and make a trade-off of the imaging system parameters,a quantitative evaluation approach based on the multi-parameters joint optimization is proposed for the hyperspectral remote sensing.In the proposed approach,the mineral identification is defined as the number of the minerals identified and the key imaging parameters employed include ground sample distance(GSD)and spectral resolution(SR).Certain limitations are found among parameters that are used for analyzing the imaging processes.The constraints include the industrial manufacturing level,application requirements and the quantitative relationship among the GSD,the SR and the signal-to-noise ratio(SNR).Regression analysis is used to investigate the quantitative relationship between the mineral identification and the key imaging system parameters.Then,an optimization model for the trade-off study is established by combining the regression equation with the constraints.The airborne hyperspectral image collected by Hymap is applied to evaluate the performance of the proposed approach.The experimental results reveal that the approach can achieve the evaluation of the mineral identification and the trade-off of key imaging system parameters.The error of the prediction is within one kind of mineral.