公开(公告)号：US20200048092A1

公开(公告)日：2020-02-13

申请号：US16484520

申请日：2018-02-08

Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION

Inventor： Steven WRIGHT

IPC: C01B25/18 ,  C01B25/01

Abstract: A process for recovering phosphorus from phosphoritic materials in a top submerged lance furnace or a fuming furnace is disclosed. The process employs a mixture of combustion agents to produce reducing conditions in the slag bath and post-combustion oxidising conditions in the headspace of the furnace. The process involves smelting a mixture of a phosphoritic material and a carbonaceous material in the furnace to produce a molten slag in the slag bath and phosphorus vapour in the headspace, wherein the post-combustion oxidising conditions in the headspace favours retention of ferrous oxides in the molten slag to minimise deportment of phosphorus to a ferro-phosphorus alloy; The phosphorus vapour in the headspace is subsequently oxidised to produce phosphorus pentoxide, which is subsequently passed from the headspace to a reactor to recover a phosphoric acid solution.