What is meant by the term Levigation?
Levigation is the process of grinding an insoluble substance to a fine powder, while wet. The material is introduced into the mill together with water, in which the powdered substance remains suspended, and flows from the mill as a turbid liquid or thin paste, according to the amount of water employed.
What is Levigation and trituration?
Levigation is the process of decreasing the particle size of powders via the process of triturating them with a mortar and pestle in the presence of a small amount of liquid in which the substance is insoluble. Trituration is a process useful in purifying crude chemical compounds consisting of soluble impurities.
Why is Levigation used?
Levigation is used for the separation of oxide ores from impurities.
What is Levigated clay?
In pottery, a method of purifying clay by sedimentation. The clay is thoroughly mixed with water and then left to stand. The coarser particles sink to the bottom, while the water and any organic impurities will rise to the top and can be poured off.
Which phenomena is used in Levigation?
(A) Adsorption phenomenon is used in levigation.
What is comminution in pharmacy?
Comminution is a general term for various processes used to reduce the particle size of drug materials.
What is triturate in pharmacy?
(Pharmaceutical: Processes) A trituration is a mixture of one or more finely ground powdered drugs. The trituration is a mix of a finely ground drug and lactose. A trituration was formed by mixing ground sodium chlorite and potassium chloride salts.
What means trituration?
Trituration is the name of several different methods used to process materials. In one sense, it is a form of comminution (reducing the particle size of a substance). In another sense, it is the production of a homogeneous powdered material by mixing and grinding component materials thoroughly.
What is the purpose of geometric dilution?
Geometric dilution is the process of diluting something based on its measured size. Most often, scientists and doctors employ this method when combining fine powders of unequal amounts to ensure equal distribution. Bakers sometimes use geometric dilution to equally combine the dry ingredients in a mixture.
What is compounding powder?
In compounding, “powder” refers to a dosage form that exists as fine particles. The formulation may contain only the active drug or may be mixed with other ingredients.
What is gravity separation or Levigation?
Gravity separation is also called levigation or hydraulic washing. Here, the lighter gangue particles are removed from heavier ore particles by washing in a water current. It is mainly used for oxide ores and carbonate ores based on their difference in densities of the ore particles and impurities. Chemistry.
What is production of high vacuum?
(i)Production of high vacuum: Traces of air can be adsorbed by charcoal from a vessel, evacuated by a vacuum pump to give a very high vacuum. (ii)Heterogeneous catalysis:The gaseous reactants are adsorbed on the surface of the solid catalysts.
What is P80 in mineral processing?
comminution process. P80. = particle size at which 80% of the. material will pass when screened. n = exponent characteristic of the comminution device, product size range, and material.
What is comminution theory?
A general theory of comminution should consist of two parts, one that deals with the energy required to break mineral particles and another that examines how this energy is distributed to the particles generated after breakage.
What is Triturates?
1 : crush, grind. 2 : to pulverize and comminute thoroughly by rubbing or grinding. triturate. noun. trit·u·rate | \ ˈtri-chə-rət \
What is pharmacy trituration?
noun. (Pharmaceutical: Processes) A trituration is a mixture of one or more finely ground powdered drugs. The trituration is a mix of a finely ground drug and lactose.
What is trituration of a tablet?
: a small tablet made by molding fine moistened powder containing a medicinal and a diluent.
What is geometric dilution with example?
Geometric dilution This first dilution is then mixed with an equal portion of diluents. This process is repeated until all the powders are intimately mixed. Example: Geometric dilution of one gram of a potent drug to be mixed with 20 g of the diluent lactose.
What is geometric addition in pharmacy?
Geometric addition refers to the procedure of blending small quantities of powder,15 where an API, is added to larger quantities of powder, usually diluents or excipients.
What is the meaning of levigation?
Or Powders, levigation is the process of reducing particle size of a solid by triturating it in a mortar or spatulating it on an ointment slab or pad with a small amount of a liquid or melted base in which the solid is not soluble. 4.
What is the difference between levigation and trituration?
Levigation is wet grinding while trituration is dry grinding. 2. Triturate is the continual rubbing of a solid in a mortar with a pestle to reduce particle size to a degree of fineness. Levigation is the process of reducing the particle size of a soild by triturating in a mortar with a small amount of liquid or melted base
What is the meaning of levitation?
lev·i·ga·tion. Process of moistening a powdered chemical before mixing it into a cream or ointment to lessen the graininess of the drug. levigation. the grinding to a powder of a moist or hard substance.
What is a levigating agent used for?
LEVIGATING AGENTS The liquid, called a levigating agent, is somewhat viscous and has a low surface tension to improve ease of wetting the solid. Levigating agents act as lubricating agents. They make incorporating solids easier, and they usually give smoother preparations.