Optimization of Gypsum Processing Parameters For the Production of Improved Quality Chalk
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2014-12
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Abstract
The study was conducted with objective that find the optimum value of the gypsum processing
parameters for the production of improved quality chalk using locally available
raw materials. Gypsum rocks with size less than 20cm in diameter and 30kg total samples
were collected from Educational Material Production and Distribution Enterprise center;
the collected samples were taken and the laboratory test processed. Experiments have been
conducted with varying influential process parameters to got different responses. Second
degree polynomial models for the responses as a function of the independent variables were
generated and optimum conditions were determined using Central Composite Face Centered
Design of Response Surface Methodology.The data were analyzed to determine optimum
conditions for testing responses parameters particle size (90,70 and 45 m), calcinations
temperature (135, 140 and 145 oC) and moisture content (5, 6, 7%); for testing the
responses bulk density((1.121 - 1.201g/cm3) and breaking strength (10 - 20N/cm). The optimum
value 1.1445g/cm3 bulk density of and 13.85N/cm breaking strength were achieved
at the optimum process parameters 85.55 m particle size, 137 oC calcinations temperature
and 6.25% moisture content. Depending on the optimum conditions determined experimentally
and the existing condition of the plant, chalk production plant process flow
sheet has been proposed and the equipments have been designed in which case most of the
equipments can be easily fabricated locally. Finally, the plant is financially evaluated and
its initial investment cost will be recovered fully within only three years, which makes the
plant viable.
Key words: Gypsum, Plaster of Paris, Response SurfaceMethodology, Chalk
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Keywords
Gypsum; Plaster of Paris; Response SurfaceMethodology; Chalk