Xem 1-12 trên 12 kết quả Mineral wastes
  • Hydraulic conductivity is the most important property of geological formations as the flow of fluids and movement of solutes depend on it. Among fluids, water and contaminant migration beneath, the ground surface have become critical for water resource development, agriculture, site restoration and waste disposal strategies.

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  • Depletion of mineral resources is one of the major problems in the world. We have consumed available resources as if they were unlimited, and at the same time we generate a huge quantity of waste, thereby contaminating the Earth. The amount of waste in our society reflects how much resources we consume. We, as modern society, create more products and packaging which is visually appealing but cannot be easily decomposed. Energy demands, resource limitations, and environmental pollution are closely linked.

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  • Depletion of mineral resources is one of the major problems in the world. We have consumed available resources as if they were unlimited, and at the same time we generate a huge quantity of waste, thereby contaminating the Earth. The amount of waste in our society reflects how much resources we consume. We, as modern society, create more products and packaging which is visually appealing but cannot be easily decomposed. Energy demands, resource limitations, and environmental pollution are closely linked.

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  • Human activities have a large and important impact on the environment. Naturally occurring elements or compounds are often concentrated and redistributed in the environment through industrial processes, power production, and consumer activity. For example, lead, which is found in naturally occurring mineral deposits, has become a major pollutant through its use in batteries, paints, and gasoline additives.

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  • Atomic Absorption Spectroscopy is an analytical technique used for the qualitative and quantitative determination of the elements present in different samples like food, nanomaterials, biomaterials, forensics, and industrial wastes. The main aim of this book is to cover all major topics which are required to equip scholars with the recent advancement in this field. The book is divided into 12 chapters with an emphasis on specific topics.

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  • One of the most remarkable agricultural practices adopted by any civilized people is the centuries-long and well nigh universal conservation and utilization of all human waste in China, Korea and Japan, turning it to marvelous account in the maintenance of soil fertility and in the production of food. To understand this evolution it must be recognized that mineral fertilizers so extensively employed in modern western agriculture, like the extensive use of mineral coal, had been a physical impossibility to all people alike until within very recent years.

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  • Leading mining companies have taken up the chal- lenge and are pushing beyond minimum legal requirements through voluntary initiatives, to ensure their continued “license-to-operate” from the com- munity as well as increasing their competitive advantage through continuous, voluntary improve- ments in environmental performance. As with all mining activities, the extraction and bene- ficiation of phosphate rock and potash to produce mineral fertilizer raw material has the potential to cause environmental impacts.

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  • Beneficiation (or concentration) processes are gener- ally used to upgrade the phosphate content by removing contaminants and barren material prior to further processing. A few ores are of sufficiently high quality to require no further concentration. The natu- rally occurring impurities contained in phosphate rock ore depend heavily on the type of deposit (sedi- mentary or igneous), associated minerals, and the extent of weathering. Major impurities can include organic matter, clay and other fines, siliceous material, carbonates, and iron bearing minerals.

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  • Care should be taken in choosing preservatives. For example, Method 5035 notes that, “Soil samples that contain carbonate minerals (either from natural sources or applied as an amendment) may effervesce upon contact with the acidic preservative solution in the low concentration sample vial.” Therefore, calcareous soils that effervesce on contact with the preservative solution, which is intended for low-level samples, should be preserved using an alternative technique.

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  • At present more than 62% of all MSW generated in England is disposed of in landfills3. However, European and UK legislation has been put in place to limit the amount of biodegradable municipal waste (BMW) sent for disposal in landfills4. The Landfill Directive also requires waste to be pre-treated prior to disposal. The diversion of this material is one of the most significant challenges facing the management of MSW in the UK.

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  • In many European countries incineration is used as an important means of waste disposal in urban areas. The proportion of waste disposal by this route varies across Europe, from 13% in Italy to 53% in Switzerland, with an average value of 20 %. However, in some countries (for example, Portugal, Spain) the use of incineration is not used or is under consiration as a new option for waste disposal. Two main types of pollutants (combustion gases and fly ash) are emitted from incinerators.

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  • The specific process employed will depend on factors such as the characteristics and constituents of the potash ore and the market specifications. Generally, the ore is reduced in size using a system of crushing and grinding to liberate the different miner- als from each other. This is usually followed by desliming by intense agitation followed by flotation or hydrocyclones to separate the fines consisting of clays, dolomite and sand from the potash ore.

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