The article describes the potential and limitations for recovery of phosphate from secondary materials in the production process for white phosphorus. This thermal process involves the feeding of phosphate rock, cokes and pebbles to a furnace. The reducing conditions in the furnace promote the formation of white phosphorus. The article describes the limitations of feeding secondary phosphate sources to the process in terms of the amount of phosphate present, impurities present, water content, etc. It then explains possibility of phosphate recovery from different sources like sewage sludge, manure, bone meal ash, industrial and food industry waste streams. It states that waste legislation in different countries restricts the possibility of obtaining secondary phosphates from wastes and a less rigid legislation and regulation would help in obtaining waste as sources for phosphate recovery.
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