Research of the phosphugessum as thermal-isolating material industrial uses

Hugo Vicente Silva, Deovaldo Moraes Junior, Aldo Ramos Santos

Abstract


Phosphogypsum is the primary by-product of the wet-acid process for producing phosphoric acid from phosphate rock for obtaining fertilizer. As it is largely a calcium sulfate it has been given the name phosphogypsum. For every ton of phosphoric acid, some four to five tons of phosphogypsum are also manufactured. So, phosphate production generates very large volumes of phosphogypsum, which is stored in huge piles called "stacks" outdoors. Many researches have been developed due to the possibility of the use of phosphogypsum as matter for several industrial uses. This paper is up to determine the constancy of the thermal conductivity (k) of the phosphogypsum in order to evaluate it as a thermo-isolating material to be used in large scale by industry as well to be used in building sectors. For this purpose, one experiments has been tested resulting in a comparison among the thermal conductivity coefficients (k) of the phosphogypsum to other commercial thermal-isolating materials.

Key-Word

Phosphogypsum, phosphoric acid, thermal isolator, thermal conductivity, method of heat transfer by conduction in flat wall.


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