A new process for the manufacture of technical-grade phosphoric acid uses fossil fuel as an energy source rather than electric power. Phosphate ore in a conventional direct-fired rotary kiln is reduced with carbon to elemental phosphorus. Burning of the phosphorus and co-produced carbon monoxide provides energy for the endothermic reduction. The process has been demonstrated in a 10 tons/day solids feed capacity pilot kHn, obtaining phosphate
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