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Archives :: Processing & Handling :: Solids Handling

Displaying 261 - 280 of 327 stories.
November 1, 2010
Mechanical centrifugal air classifiers are used extensively to process aggregates, ceramics, chemicals, foods, minerals, metals, plastics, flyash and other materials. They are normally employed when the particle size that you need to separate is too fine to screen. The air-classified product can be either the granular coarse discharge with very little fines and dust, or it can be the fines discharge with...
http://www.che.com/processing_and_handling/solids_handling/Mechanical-Centrifugal-Air-Classifiers_6123.html
November 1, 2010
Question:  Should we convert from manual dumping of sacks to discharging from bulk bags?    Answer: Dry, bulk chemicals have long been purchased in 50-lb (23-kg) paper and plastic sacks for several reasons. In volumes smaller than rail and truckloads, sacks were often the only packaging in which to purchase many such products. Sacks also enabled plant personnel to physically lift, slit and...
http://www.che.com/processing_and_handling/solids_handling/Ask-the-Experts-Discharging-from-bulk-bags_6160.html
October 1, 2010
As demand for rare-earth metals in a wide range of technology applications continues to increase, efforts to reestablish mining and production of rare-earth elements (REEs) is underway outside China, currently the dominant force in REE production. Future supplies of REEs and the myriad products in which they appear will depend less on absolute geological reserves and global trade politics and more on...
http://www.che.com/processing_and_handling/solids_handling/Rare-Earth-Metals-For-the-Future_6032.html
October 1, 2010
These days, there seem to be more reasons than ever to change feedstocks throughout the chemical process industries (CPI). Whether environmental, or more directly based on financial and market drivers, big benefits usually require big changes. This is especially true in switching to many renewable feedstocks, which either add or compound challenges related to processing solids. When Columbia Forest...
http://www.che.com/processing_and_handling/solids_handling/blending/Lessons-in-Feedstock-Change_6051.html
August 1, 2010
Feeder combines speed with accuracy Hapman The PosiPortion feeder (photo) offers a 2-in-1 feed screw option that dramatically improves batch accuracy without compromising speed. A two-speed delivery scheme, consisting of a fast turning “bulk-mode” and a slower “dribble-mode”, are used to meet batch set points. The system comes with a performance guarantee, and additional equipment...
http://www.che.com/processing_and_handling/solids_handling/feeding_and_conveying/Focus-on-Feeding-and-Conveying_5893.html
July 1, 2010
Storage of bulk materials in hoppers, bins and silos is ubiquitous in the chemical process industries (CPI), and so are the challenges that go along with it. Flow stoppage (bridging or arching), variability in mixture composition (de-mixing or segregation), erratic flow, uncontrolled flow (flooding), discharge-rate limitations and structural failures are not uncommon. While the impact of vessel geometry is...
http://www.che.com/processing_and_handling/solids_handling/bins_silos_and_storage/Using-Inserts-to-Address-Solids-Flow-Problems_5810.html
June 29, 2010
This table supports the article Using Inserts to Address Solids Flow Problems, CE, July 2010, pp. 32–37. U. S. Patents       Patent # Date Title Inventors 1,731,675 Oct. 15, 1929 Sawdust Feeder McCoy, John C. 2,843,274 Jul. 15, 1958 Flow Control Baffle for Granular Material Williams, Gael M. 3,166,222 Jan. 19, 1965 Vibratory Bin Agitator Schrader, Preston H. 3,794,386 Feb. 26, 1974...
http://www.che.com/processing_and_handling/solids_handling/bins_silos_and_storage/A-cross-section-of-insert-patents_5857.html
May 1, 2010
A virtually endless number of process options are available for agglomerating powders in the chemical process industries (CPI). These processes can be divided into two main categories: agitation and compression. Agglomeration by agitation includes granulation processes, such as fluidized-bed, disc, drum and mixer granulators. Agglomeration by compression includes compaction processes, such as tabletting...
http://www.che.com/processing_and_handling/solids_handling/Agglomeration-Technology-Equipment-Selection_5641.html
April 26, 2010
Question:  What can we do to prevent caking? When our powders are packaged into bags at our plant, they appear to be free of agglomerates.  However, our customers report that when the bags are opened at their facilities, they observe an excessive amount of caked material.  This results in rework and potential losses in sales.  We suspect that moisture is the cause, but our bags include...
http://www.che.com/processing_and_handling/solids_handling/Ask-the-Experts-Cake-Prevention_5600.html
April 1, 2010
A rapid and ongoing expansion of polysilicon production capacity will likely generate an oversupply for the next several years, driving polysilicon manufacturers to further innovate processes and reduce operating costs in preparation for an impending wave of new demand. Drastic price drops experienced in 2009 are expected to continue at a slower pace in 2010, yet polysilicon producers remain poised to...
http://www.che.com/processing_and_handling/solids_handling/Polysilicon-Production_5559.html
April 1, 2010
Particulate systems are everywhere; they are responsible for bright red sunsets, the texture of chocolate and the rate of drug delivery in the human body. Particulate processing and size control originated back in prehistoric times where mixtures of pigments were finely pulverized and used in the painting of cavern walls. From those primitive beginnings, the use and processing of particulate matter has...
http://www.che.com/processing_and_handling/solids_handling/testing_and_modeling/Particle-Sizing-Across-the-CPI_5574.html
March 1, 2010
Powder agglomeration is used in a wide variety of the chemical process industries (CPI), and a virtually endless number of process options are available. Selection requires engineers to make a substantial number of design decisions, such as the choice between wet or dry processing, the intensity of mixing and shear rates, continuous versus batch operation, cross contamination of products and ease of...
http://www.che.com/processing_and_handling/solids_handling/Agglomeration-Technology-Mechanisms_5497.html
January 1, 2010
Particulate buildup and other material flow problems are common hurdles wherever dry materials find application in the chemical process industries (CPI). Since manual intervention is costly in terms of downtime, and can be quite hazardous for the personnel involved, dedicated equipment is an attractive way to either prevent or remove flow blockages. Equipment options include vibrators and air cannons and a...
http://www.che.com/processing_and_handling/solids_handling/A-Sound-Solution-to-Material-Flow-Problems_5399.html
January 1, 2010
This weigh belt helps minimize material build up Thayer Scale- Hyer Industries The Model SI Ultra-Sanitary Insertion weigh belt (photo) is designed to enable effective and efficient cleaning for sanitary applications in food processing. The weigh belt features a trough shape to help keep product away from the belt edges. The trough shape eliminates the need for side skirts, which can be an area prone to...
http://www.che.com/processing_and_handling/solids_handling/weighing/Focus-on-Weighing_5380.html
December 4, 2009
  Piab Vacuum Conveyors The UC Series of vacuum conveyors (photo) comply with Good Manufacturing Practice (GMP) standards, and are suitable for pharmaceutical processing applications, including loading and unloading coating pans, manufacturing tablet cores and handling or...
http://www.che.com/processing_and_handling/solids_handling/feeding_and_conveying/A-vacuum-conveyor-that-is-GMP-compliant_5336.html
December 4, 2009
The Megatex XD Screener provides high-capacity throughput for large-volume applications in agriculture, plastics and chemicals. The screener has a unique elliptical-linear motion designed for high screening performance with low...
http://www.che.com/processing_and_handling/solids_handling/milling_grinding_and_screening/Handle-high-volume-applications-with-this-screener_5345.html
December 1, 2009
As bulk-solids processors look for ways to save money, manufacturers of screening equipment are concentrating on maximizing the efficiency of the equipment they offer. Screening has been prominent in solid-solid separations in the chemical process industries (CPI) for decades. It is usually performed either to remove oversize particles and foreign materials from a bulk solid (scalping), to separate...
http://www.che.com/processing_and_handling/solids_handling/milling_grinding_and_screening/Screeners-target-efficiency_5321.html
September 1, 2009
Plastics are most commonly produced and sold in pellet form due to the superior handling characteristics of pellets in downstream applications. From the moment the polymer is pelletized from its molten state, the pellets or granules undergo a series of handling steps as they move from the producer to the consumer. For instance, post-pelletization steps include: • Hydraulic conveying • Drying...
http://www.che.com/processing_and_handling/solids_handling/testing_and_modeling/Measuring-Dust-and-Fines-In-Polymer-Pellets_5028.html
August 1, 2009
Many branches of the chemical process industries (CPI) make use of impact comminution to process solid matter, such as minerals, foodstuffs, pharmaceutical products, and above all, products for the chemicals industry. Impact comminution is also used for coarse crushing, but the focus of this article is fine grinding with end-product particle sizes below 500 µm. The technology of impact comminution...
http://www.che.com/processing_and_handling/solids_handling/milling_grinding_and_screening/Fine-Grinding-With-Impact-Mills_4989.html
July 1, 2009
Distribute and weigh solid library compounds automatically Compound libraries are critical to pharmaceutical companies. Liquid handling for the dissolution of library compounds has been automated for many years, but the distribution and weighing of the original solid dry-stored library compound is still done manually. The Calli-L (photo) is specifically designed for the distribution of dry, powder library...
http://www.che.com/processing_and_handling/solids_handling/weighing/Focus-on-Weighing-and-Proportioning_4921.html
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