Ghana Mining Journal

The AJOL site is currently undergoing a major upgrade, and there will temporarily be some restrictions to the available functionality.
-- Users will not be able to register or log in during this period.
-- Full text (PDF) downloads of Open Access journal articles will be available as always.
-- Full text (PDF) downloads of subscription based journal articles will NOT be available
We apologise for any inconvenience caused. Please check back soon, as we will revert to usual policy as soon as possible.

Utilization of Microwave Energy in the Calcination and Agglomeration of Nsuta Manganese Carbonate Ore

RK Amankwah, G Ofori-Sarpong


The application of microwave energy in the calcination and agglomeration of manganese carbonate ore from Nsuta, Ghana, has been investigated. The real and imaginary permittivities, which may be used to determine a substance's response to
microwave heating, were measured and the permittivities of both the ore and calcine were relatively low at low temperatures. Beyond 600oC, both the real and imaginary permittivities increased more rapidly with that of the calcine reaching relatively high values. The degree of microwave absorption and thus the temperature attained by the samples during microwave heating increased with sample mass, processing time and incident microwave power. Processing temperatures of over 1500oC could be attained under optimum microwave coupling. Calcination and agglomeration tests were performed and
the calcine obtained readily absorbed microwaves. The tumbler index of the agglomerated material was 90 and the average crushing strength was 2550 KN.

Ghana Mining Journal Vol. 9 2007: pp. 54-61
AJOL African Journals Online