Process for chemical separation of phosphorus ore

The process for chemically refining phosphorus ore comprises the following steps:

• (a) reacting an aqueous mixture of ammonium chloride and ammonium nitrate in a weight ratio of 0.5-10:1 having a concentration of 5-25% by weight with phosphorus ore powder of between -20 mesh and -200 mesh in an ore pulp reaction with 1:2-10 weight ratio of phosphorus ore powder to the aqueous mixture of ammonium chloride and nitrate at a temperature of at least about 60.degree. C. while undergoing mixing for at least 10 minutes to produce solid, liquid and gas products and then filtering off the phosphate solid;
• (b) adding an oxidizing agent into the separated filtrate at a temperature of at least 50.degree. C. to convert Fe.sup.2+ in the filtrate into Fe.sup.3+ while undergoing mixing and after the reaction, adding a suitable amount of aqueous ammonia to adjust the pH value of the reaction solute to 7-8 and to bring about ammoniatization as to form a precipitate comprising Fe(OH).sub.3 and Al(OH).sub.3, then filtering;
• (c) adding ammonium sulphide into the ammoniated filtrate at a temperature of at least 50.degree. C. to bring about sulfurization;
• (d) introducing continuously the gases obtained from step (a) into the sulfurized filtrate at a temperature of at least 50.degree. C. to bring about carbonization;
• (e) adding alkali into the carbonized filtrate at a temperature of at least 50.degree. C. to adjust the pH value of the filtrate to 10-12 while undergoing mixing to bring about a reaction to form a magnesium-containing precipitate, after filtration an acid is added to adjust the pH value of the regenerated solution to 7-8.