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Use of by-Pass Cement on the Production of
Sodium Chromate from Pellets Containing Chromite Ore Concentrate and Soda Ash The
amount of by-pass cement produced from Egyptian Cement Companies is more than 10% of the
total cement production. This dust is harmful on the health of human beings especially for
those living near the company. It is known that the preparation and crushing of the raw
materials for cement production is a highly expensive step. Accordingly, decreasing the
amount of dust reduces the production cost of cement per ton. Many investigations were
carried out to solve this problem by recycling this dust in alternative processes (e.g.
use it in the production of cement, clay bricks, or as a fertilizer by mixing it with
sewage water). Recycling it with raw materials can only be carried out in the wet process
of cement production. Unfortunately, up till now these solutions has not yet been
sufficient. In this investigation, a trial is made to use such dust as catalytic material
in the production of sodium chromate. In this investigation, two feed materials consist of
the chromite ore concentrate and soda ash with and without cement dust addition was
firstly pelletized and the properties of the produced pellets were examined. The suitable
pellets (from its mechanical properties point of view) were subjected to firing process at
different temperatures, then the roasted pellets were dissolved in hot water and the
sodium chromate was extracted from it. Also this paper studied the kinetics of formation
of sodium chromate for both pellet types. |
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