From the Desk of Executive Director

Affordable Rental Housing Complexes (ARHCs)

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A plant has recently been set up in India to produce walling blocks, ceiling tiles and binder from Phosphogypsum.

The following steps convert phosphogypsum to commercially gypsum plaster boards:


1.    Grinding of calcined gypsum, and its storage.


2.    Proportioning and mixing of gypsum plaster with water. Set controller and filler is-added to this slurry with a small quantity of glass fibre as reinforcement;


3.    Casting of board with the board forming machine.


4.    Carrying the 'green' board on a belt conveyor until the core sets and edges are stuck.


5.    Cutting boards with a rotary knife into lengths of 1m to 6m before the 'green' board reaches the end of the machine belt.


6.    Drying of boards by passing them through a tunnel kiln. Hot-air/steam allow recirculation of air. Natural drying is possible for small production. Drying is a very sensitive operation requiring careful attention.


7.    Transferring of dry boards on to portable platform and transportation to the warehouse.


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