Buscar
Estás en modo de exploración. debe iniciar sesión para usar MEMORY

   Inicia sesión para empezar

level: Level 13 - Fine Grinding Mills

Questions and Answers List

level questions: Level 13 - Fine Grinding Mills

QuestionAnswer
Types of Fine grinding mills:1 Roller mill: Crack-U-Lator, 1-300 mm 2 Hammer mill: Fitzmill comminutor,10-<10000 mm 3 Chaser mill 4 Centrifugal-impact mill and sieve: Quick sieve, Turbo sieve, CoMill 5 Cutter mill: 80to100 mesh (0.177-0.149 mm) 6 Attrition mill 7 Pebble or ball mill: Pot mill or Jar mill, 1-300 mm 8 Vibrating ball mill 9 Fluid-energy mill: jet mill, doughnut shaped mill, 1 to 20 mesh (25.4-0.841 mm) 10 Centrifugal-impact pulvurizer
done through attrition action, for soft but not abrasive substances, they do not cause damage or removal of surface materials Types of Fine grinding millRoller mill: Crack-U-Lator, 1-300 mm
all drugs but not abrasive drugs Types of Fine grinding millHammer mill: Fitzmill comminutor, 10 - <10000 mm
used too heavy granite stone that are mounted vertically like wheels that are made to revolve Types of Fine grinding millChaser mill
combines sieving and milling into a single operation Types of Fine grinding millCentrifugal-impact mill and sieve: Quick sieve, Turbo sieve, CoMill
useful in reducing particle size of fibrous materials and they act buy cutting and sharing action; not for fiable materials Types of Fine grinding millCutter mill: 80 to 100 mesh (0.177-0.149 mm)
uses two stones or steel grinding plates or one or both of which revolve to provide grinding; used for soft fibrous materials but not abrasive Types of Fine grinding millAttrition mill
slow process in reducing particle size; uses attrition and impact action Types of Fine grinding millPebble or ball mill: Pot mill or Jar mill, 1- 300 mm
with ball inside Types of Fine grinding millVibrating ball mill
solid materials are subjected to streams of high velocity elastic fluid; for moderately hard and friable material and not for soft and sticky material Types of Fine grinding millFluid-energy mill: jet mill, doughnut shaped mill, 1 to 20 mesh (25.4-0.841 mm)
use for heat sensitive material Types of Fine grinding millCentrifugal-impact pulvurizer
➢ A process of reducing the size of the dispersed phase in dispersion ➢ Only use for dispersed system or two phased systemHOMOGENIZATION
Equipment for HOMOGENIZATION1 Colloid mill 2 Homogenizer
involves the passage of mix phases of dispersion between a stator and a high-speed rotorColloid mill
– involve the passage of mix phases of dispersion between a finely grounded valve and they will sit under a high pressureHomogenizer
• Method of preparation HOMOGENIZATION• Solutions: - simple solution, - solution by chemical reaction, - solution by extraction • Suspensions; - dispersion or precipitation by double decomposition - alteration of pH • Emulsions: - w/o. ingr are dissolved in the phase in which they are soluble then add internal phase to external phase, - o/w, phase inversion technique, water phase is added to oil phase