Archives :: Processing & Handling :: Solids Handling

Displaying 321 - 333 of 333 stories.
January 1, 2007
    Chemicals, plastics, pharmaceutical, food, agricultural chemicals, coal and bio-chemical industries have a wide array of processes where the raw materials, intermediates and products are in particulate form. Hazards associated with particulate solids are unique, and in most cases depend on the particle size. The purpose of this paper is to present a systematic framework for designing...
http://www.chemengonline.com/processing_and_handling/solids_handling/Design-Safer-Solids-Processing-Plants_3118.html
November 1, 2006
    The need to transfer bulk-solids materials from the outlet of a bin or from a conveyor, to a process, truck, or another bin is ubiquitous throughout the chemical process industries (CPI). Transferring material using equipment designed to mechanically convey chemicals works quite well, especially for long distances; however, for short distances, it can be prohibitively expensive and...
http://www.chemengonline.com/processing_and_handling/solids_handling/bins_silos_and_storage/The-Dos-and-Donts-Of-Chute-Design_3114.html
November 1, 2006
    This improved planetary mill adds new safety features The premium line is a new generation of this firm's planetary mills for laboratory application (photo). Compared with traditional planetary mills, the premium line is said to provide 250% more grinding energy, says the manufacturer. The planetary mill is said to be as easy to operate as a centrifuge. The fool-proof grinding bowls are...
http://www.chemengonline.com/processing_and_handling/solids_handling/milling_grinding_and_screening/Size-Reduction-Equipment_2837.html
October 1, 2006
    Provided that they are updated when appropriate to keep them relevant, time-tested heuristics rules based upon experience, also referred to as rules of thumb, can be useful for the design, specifying and operation of several kinds of equipment used in process plants. The first and foremost heuristic rule is that the engineer should not shy away from using heuristics - and the second rule is...
http://www.chemengonline.com/processing_and_handling/solids_handling/feeding_and_conveying/Heuristics-Rules-for-Process-Equipment_2808.html
August 1, 2006
    Myths and misconceptions become part of accepted practice if repeated often enough. They are propagated by lack of fundamental particle-technology knowledge and by certain commercial interests. The list of presented here is by no means exhaustive. We have, however, made an attempt to cover a broad range of topics to highlight the widespread nature of these misconceptions. They are broken down...
http://www.chemengonline.com/processing_and_handling/solids_handling/Dont-Fall-For-Common-Misconceptions_3113.html
July 1, 2006
    Processes incorporating bulk solids handling are ubiquitous in the chemical process industries (CPI), including the chemical, petrochemical, polymer, biochemical, agricultural chemicals, paints/pigments, energy and power, pulp and paper, and pharmaceutical industries, to name a few. Studies conducted during the past two decades have shown that:     More than 50% of products are...
http://www.chemengonline.com/processing_and_handling/solids_handling/Solid-Tips-for-Project-Success_3112.html
July 1, 2006
    Making sure the correct amount of material is fed to a batch reactor, bag or storage bin is important to everyone in the chemical process industries (CPI). Because the CPI cover such a broad spectrum, manufacturers are faced with a variety of factors to consider when designing weighing and feeding equipment — from increasing throughputs with more compact designs, through reducing dust...
http://www.chemengonline.com/processing_and_handling/solids_handling/feeding_and_conveying/Weighing-and-feeding-in-the-Spotlight_3077.html
May 1, 2006
    It’s an old saw, but I’ve long held that process development is very much a team effort. Developing safe, robust and scaleable chemical processes calls for close collaboration between synthesis chemists, process development engineers and pilot plant personnel. But experience shows that, particularly in many fine chemical and pharmaceutical organizations, researchers fail to put...
http://www.chemengonline.com/processing_and_handling/solids_handling/A-Bit-of-Extra-Lab-Effort-Can-Prevent-Grief-During-Scaleup_2817.html
May 1, 2006
    Accurate prediction of particulate-solids flow behavior during storage and feeding has eluded all but the most experienced solids handling experts. Often the process engineer is faced with the awkward task of making sense of bulk behavior. A powder sample held in a jar may appear to be free flowing, but hammer rash — jargon for the practice of hitting hoppers with pipes to dislodge...
http://www.chemengonline.com/processing_and_handling/solids_handling/feeding_and_conveying/Predicting-Powder-Flow-Behavior-A-New-Approach_2777.html
April 1, 2006
Most chemical processes must produce products that are uniformly mixed. There have been many articles written about preventing particle segregation during bulk solids flow; and ensuring a mass flow pattern is a common suggestion. But mass flow alone is not necessarily the answer to all segregation problems that can occur in silos and tanks. We will focus on the two major mechanisms of segregation; namely...
http://www.chemengonline.com/processing_and_handling/solids_handling/Will-Mass-Flow-Solve-All-Your-Segregation-Problems_3111.html
March 1, 2006
The presence of arsenic minerals, such as enargite and tennantite, in some copper-bearing ore bodies, can be a problem for those wishing to recover the copper. When delivering copper concentrates to smelters in Australia, for example, miners are subjected to substantial penalties if...
http://www.chemengonline.com/processing_and_handling/solids_handling/Chementator-Selective-flotation_2914.html
February 1, 2006
    In pneumatic conveying systems that operate under high positive pressure, it is common wisdom that as the downstream end is approached, the diameters of the pipeline segments should be larger. Air (or other conveying gas) is compressible, so if a single-diameter pipeline is instead used, the gas velocity will reach very high values. If the conveyed material is abrasive, the consequence can be...
http://www.chemengonline.com/processing_and_handling/solids_handling/Pneumatic-Conveying-Before-Stepping-the-Line-Look-Into-Air-Extraction_2813.html
January 1, 2006
    Successful startup and operation of solids-handling processes depend on myriad small yet fateful decisions that are made during the various phases of the project. Many of these are not quantitative but qualitative in nature, and are largely based on experience and broad-based knowledge of solids handling. It is just as important to know what not to do as it is to know what to do. Since many...
http://www.chemengonline.com/processing_and_handling/solids_handling/Guidelines-for-Solids-Storage-Feeding-and-Conveying_2773.html
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