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Archives :: Processing & Handling :: Solids Handling

Displaying 301 - 320 of 322 stories.
August 1, 2007
    Vessels for handling bulk solids, such as silos and bins, are frequently used to heat or cool bulk materials in cases where a slow rate of change or long residence time is required. Often, the temperature of a bulk-solids stream must be raised, for example to bring about a chemical reaction in a subsequent processing step. Alternatively, a reduction in temperature is sometimes needed, for...
http://www.che.com/processing_and_handling/solids_handling/Using-Bins-and-Silos-To-Heat-or-Cool-Bulk-Solids_3345.html
July 1, 2007
Linde Gas (Murray Hill, N.J.; edlinks.che.com/6897-538) and partners have developed a high-pressure gas-delivery system that allows coating powders to be sprayed using liquid nitrogen at temperatures that do not melt the powder particles. The system has been optimized to support a new, cold spray gun technology, called Kinetiks 4000, manufactured by CGT GmbH (Ampfing, Germany). Such a system is being...
http://www.che.com/processing_and_handling/solids_handling/coating_forming_and_agglomeration/Cold-spray-coatings_3289.html
July 1, 2007
    As the nanoparticle market continues to swell, expertise is surfacing about nanoparticle grinding and dispersion processes. A grinding solution (wet grinding with agitator bead mills) achieves the production of nanoparticles with an average fineness of 40–100 nanometers (nm). However, dispersion doesn’t always come as easily. Chemists and process engineers found that many...
http://www.che.com/processing_and_handling/solids_handling/milling_grinding_and_screening/NanoparticlesMild-Dispersion_3150.html
May 1, 2007
    A feeder for both batch and continuous operation Available in 7 models with feedrates from 1 to 550 ft3/h, the Better-Weigh Feeders (photo) are designed to provide feeding in either batch or continuous mode, depending upon the arrangement of the unit’s control electronics. In batch mode, the controller is used to control the fast (bulk) and slow (dribble) speeds of the feeder...
http://www.che.com/processing_and_handling/solids_handling/Solids-Processing_3156.html
April 1, 2007
    The world's largest pharmaceutical conference and exhibition, Interphex, will be held at the Jacob Javits Convention Center in New York from April 24-26. Approximately 1,000 global companies that serve the pharmaceutical and biotechnical industries will showcase their latest lines of equipment, technologies and services in the areas of manufacturing, sourcing and services, information...
http://www.che.com/processing_and_handling/solids_handling/Interphex-Show-Preview_3163.html
April 1, 2007
    Modeling the behavior of bulk solids has been a longstanding challenge for researchers and practitioners alike. The differences between fluids, rigid solids and bulk solids can best be illustrated by their responses to applied stress. For instance, when an external stress is applied to a fluid, it is transmitted equally in all directions. The response of a rigid solid (such as a metal bar) to...
http://www.che.com/processing_and_handling/solids_handling/bins_silos_and_storage/Modeling-Granular-Flow-Using-Discrete-Element-Method-From-Theory-to-Practice_3344.html
April 1, 2007
The conventional way to make molded ceramic compontents involves the use of an organic binder (about 10-15 wt.%) to keep the shape of the fine ceramic powders. The binder is then burned off during the sintering process; this not only requires additional energy to burn out the binder (which may also release toxic gases), but finished ceramic...
http://www.che.com/processing_and_handling/solids_handling/coating_forming_and_agglomeration/Ceramic-molding-without-binders_3235.html
March 1, 2007
    With energy costs rising, the value of most powders and bulk solids has been rising steadily as well, giving manufacturers ample reason to improve production efficiency. "Companies not only want to reduce their consumption of power, they also want to reduce product losses," says Scott Will, director of sales and marketing for Modern Process Equipment (Chicago, Ill.); "if you...
http://www.che.com/processing_and_handling/solids_handling/milling_grinding_and_screening/Increasing-Particle-Sizing-Efficiency_3321.html
February 1, 2007
    There are a variety of reasons to consider the purchase of a new tank or silo1. As organizations grow, so does the need for increased storage capacity. Meanwhile, an old tank may become corroded or worn and require replacing. Once it's determined that a new tank is needed, there are a variety of choices to consider. Whatever the end purpose, the chemical process industries (CPI) require tanks...
http://www.che.com/processing_and_handling/solids_handling/bins_silos_and_storage/Silo-Design-And-Selection_3343.html
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.che.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.che.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.che.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.che.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.che.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.che.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.che.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.che.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.che.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.che.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.che.com/processing_and_handling/solids_handling/Chementator-Selective-flotation_2914.html
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