Solids Handling BenchTable of ContentsI. II. Introduction Equipment Schedule 5 7 8 9 20 21 23 27 30
III. Installation and Commissioning IV. Sieving V. Bulk Density and Angle of Repose VI. Flow from a Hopper VII. Solids Mixing VIII. Non-Standard Electrical Supplies IX. Graphical Representation
Solids Handling BenchRG 3700 Solid Handling Study Bench the latest equipment for Solid Handling Study Bench, a size reduction with a ball mill can also be studied.
Solid Handling Bench handling of bulk solids forms an important part of many process operations, particularly in the fertilizer, coal, etc.
The major parts of the solid handling study bench Solid Mixing Tank for Solid Mixing with its efficient hightorque impeller generates high mixing forces for the preparation of high viscosity materials and the dissolution and dispersion of concentrated powders in liquid. Switch Control a remotely controlled relay that is placed which consume large amounts of electricity and controller unit of the equipment. Metal Frame for Mixing Cabinet method often requires extensive cutting of individual framing members or solids and a practical, code approved solution to many for mixing materials form the bends that make the shapes. Electric Motor converts electrical energy into mechanical energy and operate through the interaction of magnetic fields and currentcarrying conductors to generate force. Cylindrical Vessel is a closed container designed to hold gases, solids or liquids at a pressure substantially different from the ambient pressure.
The handling of bulk solids forms an important part of many process operations, particularly in the fertilizer, coal, pharmaceutical, food and mineral processing plant. The arm-field bench introduces students to many aspects of solids behaviour, including measurement of bulk density, angle of response, sieving and particle size analysis, flow of solids from hoppers and solids mixing. In later versions (1977 onwards), size reduction with a ball mill can also be studied. The apparatus is essentially self-contained, and allows more than one experiment to be conducted at any one time, this increase the economic range of the solids handling bench. RG 3700 Solid Handling Study Bench (Armfield Technical Education Co. Ltd) The characterization new Solids Handling Study Bench of the solids in bulk form an important part in the process industries, particularly in the handling of fertilizers, cement, crystals, pharmaceutical, and foodstuffs. The Armfield Solids Handling Study Bench contains a number of simple items of equipment designed to introduce students to the basic understanding of solids and its behaviour. Each experiment may be undertaken separately from the others, so increasing the economic benefit of the Bench as experimental capabilities, description of equipment, and exclusions Experimental Capabilities 1. Study of sieving techniques, including size distribution plots, effect of sieve load on screen blinding, etc. 2. Angle of repose measurements. 3. Efflux rates from storage hoppers, as affected by hopper load, exit geometry, size distribution, angle of repose, etc. 4. Studies of mixing solids and appropriate sampling size and position and effect of vessel shape.
5. The apparatus is also a useful vehicle for demonstrating the application of statistical techniques. Description of Equipment Specification: The basic bench consists of a framework containing storage drawers and a table top for experimentation. Services Required: Electrical and single phase about 220-240 Volts, 50 Hz Shipping Specification: Volume of 4 metre and gross weight of 400 kilogram Overall Dimensions: Width at 2 metre, Height at 1.5 metre, Depth at 1 metre The following equipment is provided: 1. Set of standard sieves and sieve shaker. 2. Storage hopper, together with interchangeable exit orifice and solids collecting vessel. 3. 0 5 kilogram balance with weights. 4. Cylindrical vessel for solids mixing, driven by a variable speed electric drive and sampling equipment. 5. An alternative shaped mixing vessel to replace the cylinder. 6. Conductivity cell and meter/.metre for concentration measurement of particular mixture of solids e.g. salt and sand mixtures. Exclusions Supply of distilled or deionisid water, approximately 5 L per experiment Sand and salt for mixing studies, although any ither materials may be used. Stop Clock An extra charge will be made for non-standard electrical supply systems (different voltage, frequency, number of phases). The electrical
supply available in the laboratory must be quoted at the time of ordering.
1. Partial Inspection- The arm-field advice notes sent with the equipment provide a detailed list of the component parts of the equipment as packed for shipping. This list must be checked against the individually packed and labelled items immediately on arrival. Any breakage or omissions must be reported to the company within 3 days of arrival. 2. The main functional items of equipment, with their specification are as follows, (refer to drawing); a. Main support frame and bench, on which are mounted the following items Variable speed belt-driven motor and pulley. Two alternative (drum and V-arm) mixers, the drum type having a protractor arrangement for angle of repose measurement. Plexiglas hopper, with 4 alternative orifice and shut-off valve, plus 2 litres plastic collecting beakers for collecting solids. b. Separately packed Automobile sieve shaker with timer 6 British standard sieves of sizes 8, 16, 22,30,44,60. Lid-and base units for sieve stacking
c. Conductivity cell and meter, for analyzing concentration of dissolved solids when sampling solids mixing experiment. d. Solids sampler means hollow tubes to be connected to a vacuum water ejector, for solids mixing experiment. e. Single beam balanced, with S weights, for weighing solids discharged from the hopper.
f. In the 1977 a ball mill, cylindrical steel type with porcelain balls. This fits into the same urunnious as Plexiglas mixers.
Installation and Commissioning
A part from identifying the separate items of equipment and their experimental use, the only installation work needed is to wire the single phase supply for the motor the bench, and separately, the automobile sieve shaker. Care should be taken to observe the equipment wire colour coding: Brown-Live Blue-Neutral Green-Earth Yellow-Earth
The sieve shaker is extended not to the used on the bench, but on the floor of the laboratory as there is considerable variation during operations. Commissioning involved running the variable speed meter and laminar with the various for the meter derives urunnion meaning. Calibration of the conductivity cell with accurately made up solutions of sodium chloride in distilled or deionised water is also necessary, in order that solids mixing experimentally with salt and sand can be analyzed for the mixing experiment. Practice at taking solid samples of a fixed and known bulk volume with the samples should also be undertaken.
A test sieve is an instrument which is used for the measurement of particle size in its most common form; it consists of a woven wire screen, with square apertures, rigidly mounted in a shallow cylinder metal frame. For coarse sieving range down to 4 mm, and round whole sieves down to about 1 mm apertures. The sizes of solid particles from 125mm (5in) down to 38 microns can be measured rapidly and efficiently by means of a test sieve. Special screens with apertures, smaller than as microns are available, but it should be appreciated that the liner screen. It is the more easily with certain types of particulate solids tend to block or blind the openings. Particle size as measured by test sieving, may be specified simply by quoting the size of two screens, one through which the particles have passed, and the other on which they are retained., However, the most frequent use of test sieving is for measuring the size spread, and the particle size distribution. Choice of sieve sizes: For most size analyses it is usually impracticable, and indeed quite unnecessary, to use all the available screens in any standard sieve series. However, for best number of sieves to use a given test can present a problem. Broadly speaking, it sieves in the mind range of a given series are employed, not more than about 5 percent on the sample should pass the finest sieve or be retained on the coarsest. For detailed work, these limits may be lowered. Once the terminal sieves have been decided upon, the intermediate screens can be chosen. For most purposes, alternate sieves (2series) in the range are quite adequate. Over certain size ranges of particular interest, or for accurate work, consecutive sieves (2series) may be used. The intermediate sieves should never be chosen at random. The following four examples indicate some of the choices that could be made from BS sieves in the range 16-60 mesh:
A 16 B 16 C 16 D 16
22 22 22
30 30 30
36 36 36
44 44 44 44
60 60 60 60
a. Consecutive sieves which obey the 2 raise to relationships. Necessary only for detailed size analysis over the whole range. b. Alternate sieves which obey the 2 raise to relationships. Adequate for most purposes. This is the series chosen for this equipment bench. c. Bad choice, random selection, difficult to interpret for this equipment in tabular form or graphically. The weight of the simple must not be allowed to change during the test. Damp materials should be dried in an oven if necessary, but care must be taken not to alter the physical characteristics of the material. If the material has been heated in an oven it should be cooled i