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efficient construction waste ore processing line sell at a loss in mashhad‎

efficient construction waste ore processing line sell at a loss in mashhad‎

The authors study potential utilization of oil tailings of a lead-zinc processing plant. Conversion of sulfides into marketable selective concentrates is carried out in two stages: sulfide product is extracted from tailings, first, and processed, second, jointly with current ore material, using the accepted technology, or separately, by jet flotation. Sulfides are extracted from tailings using a channel-type hydroseparator. A feature of flotation scheme is stream counterflow of feed (in both cycles) and rough concentrate. Conditions and composition are developed for manufacturing a quality product from non-metal tailings: lime-sand bricks, glass containers, fiberglass and marbled glass

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metal recovery from old tailings | springerlink

Rudnev, B.P., Justification and Development of Efficient Processing Methods for Current and Aged tailings of Nonferrous, Noble and Rare Metal Dressing, Dr. Tech. Sci. Dissertation, Moscow: Gvintsvetmet, 2004

Chanturia, V.A., Vigdergauz, V.E., Shrader, E.A., et al., Advanced (Ecologically Significant) Processing Technologies for Zinc Raw Material in Mining and Processing Waste: Problems and Solutions, Inzh. Ekol., 2004, no. 5

Protod’yakonov, I.O., Lyublinskaya, I.E., and Ryzhkov, A.E., Gidrodinamika i massoobmen v dispersnykh sistemakh zhidkost’-tverdoe telo (Hydrodynamics and Mass Transfer in Dispersion Liquid-Solid Systems), Leningrad: Khimiya, 1987

metal recovery from old tailings | springerlink

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metal recovery from old tailings | springerlink

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metal recovery from old tailings | springerlink

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building design and material selection > green data center

Home > Articles > Cisco Network Technology > General Networking > Green Data Center Design and Build Strategies

Just as important as the decision of where to build your Data Center is choosing what to build it out of. Even if you've been involved in a lot of Data Center projects, this might be a new question (or series of questions) for you. Conventional Data Center Facilities are built with traditional construction materials—concrete, steel, lumber, drywall, glass, and copper, for instance. Employing different materials and streamlining their physical arrangement can result in a greener facility

That means employing high-quality, durable building materials. The fewer times you have to replace worn or damaged components, the fewer resources that are consumed. Also, choose materials composed of renewable resources, recycled content, or substances that would otherwise end up in a landfill

BuildingGreen, LLC, publisher of the monthly Environmental Building News, maintains a database of more than 2,000 "environmentally preferable" building materials. As part of compiling that list, the Environmental Building News editorial staff developed standards for designating a building product as green. Their criteria fall into five categories and provide excellent benchmarks for considering when an item to use in your Data Center project is green:

building design and material selection > green data center

Beyond employing individual recycled materials for your Data Center project, how about using a recycled building? That is, constructing your server environment within an existing structure rather than constructing entirely new. Even if you have to make major modifications for the pre-existing building to effectively house your servers, the project is still likely to consume fewer materials than a new build. Some of the environmental building assessment systems endorse this by awarding points for building reuse

The building industry generally uses the term greenfield to describe pristine or undeveloped land, brownfield for abandoned properties (typically industrial or commercial facilities) believed to contain hazardous contaminants, and grayfield for properties containing abandoned buildings. I say "generally" because in some regions, brownfield merely refers to any land that has been previously developed

You can take an even deeper look at how green your building's construction materials are by considering their embodied energy. That's the total quantity of energy expended in creating and providing a given item, including the following:

building design and material selection > green data center

Broader definitions of the term embodied energy include the energy needed to maintain an item and ultimately recycle or dispose of it. A similar concept, embodied emissions or embodied carbon, refers to the carbon dioxide produced during those same stages of an item's life

Accurately gauging the embodied energy and emissions of building materials can be extremely difficult. For one, no single method or formula has been agreed upon for calculating those values. Also, even the same building materials have their own circumstances unique to your specific project. How exactly was a given item manufactured? How far did it have to be transported, first to whatever outlet it was sold from and then to the construction site? For that matter, how was it transported? Different modes of transportation consume energy and produce carbon at different rates

Despite such variables, several studies have been performed to classify embodied energy and emissions of various materials. Embodied energy is typically measured as a quantity of energy per weighted unit of building material, for example megajoules (MJ) per pound or kilogram. Embodied emissions are expressed as a quantity of carbon dioxide per weighted unit of building material, for example pounds or kilograms of carbon dioxide per pound or kilograms

building design and material selection > green data center

The University of Bath has compiled an Inventory of Carbon and Energy that includes embodied energy and carbon ratings for approximately 170 construction materials. Researchers drew information from a variety of published sources and, where regional elements needed to be incorporated, generally based them on factors relevant to the United Kingdom. (For instance, using the typical mix for electricity produced in the UK to help calculate embodied emissions values.)

Finally, as you consider embodied energy and emissions when choosing among various building materials, don't forget to compare items based on how they are actually used in the construction of a building. For instance, although steel has higher embodied energy and emissions than brick or stone, it also has greater strength relative to its mass. If you were to build a wall out of the three materials, you can obtain the same structural strength by using a smaller amount of steel—perhaps enough less to involve less embodied energy and emissions

The building materials and fixtures you choose for your facility additionally impact air quality, both outdoor and indoor, which in turn affects the health and productivity of employees. Because green considerations often focus upon the external environment, you might not automatically think of indoor air as a consideration for how green your facility is. Nearly all environmental building assessment systems include indoor air quality as a rating criterion, though

building design and material selection > green data center

Numerous building-related components—from paints and adhesives to flooring and carpeting to furniture and office equipment—contain contaminants. Some, such as ceiling tiles, produce particulate matter that can cause eye, nose, and throat irritation. Others include organic chemical compounds that evaporate into the air. Known as volatile organic compounds (VOC), these substances can emit smog-forming particles and make building occupants ill. VOCs typically include carbon-based molecules, although specific regulatory definitions about what substances are VOCs and what aren't differ by region

To maintain good air quality at your facility, choose paints, adhesives, sealants, wood products, carpeting, and other materials that are classified as low- or no-VOCs. Several countries mandate relevant products be labeled with their VOC content, and many manufacturers provide the information even in regions where they are not required to do so. If such information is not readily available for a product you are considering purchasing, inquire with the manufacturer

During construction, provide ample ventilation when the materials are installed. Set up fans to expel polluted air outside during construction, not to bring outside air in. When possible, air out items before they are installed

building design and material selection > green data center

A handy construction tip is to provide extra ventilation whenever building materials are used that are either wet or emit an odor. Odors are a sign that an item is releasing chemicals into the air, so don't remove fans until well after the smell is gone

Various environmental and construction agencies recommend performing anywhere from 5 to 12 air changes per hour to maintain good air quality. To calculate the cumulative cfm fan rating you need to fully refresh the air in an area, take the size of the space in cubic feet, multiply it by the number of air changes per hour that you want, and then divide by 60

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