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Beneficiation of apatite rock phosphates by calcination: effects on chemical properties and fertiliser effectiveness. Lim, Robert Gilkes. Graduate Research School; Research output: Contribution to journal Article. 6 Citations (Scopus) Overview ; Fingerprint; Abstract. Apatitic rock phosphates (RP) are commonly calcined to remove impurities and to increase phosphorus (P) concentration
Uses of Apatite as Phosphate Rock. Most of the phosphate rock mined throughout the world is used to produce phosphate fertilizer. It is also used to produce animal feed supplements, phosphoric acid, elemental phosphorous, and phosphate compounds for the chemical industry. China is the largest producer of phosphate rock, producing approximately 100 million tons in 2014. The United States
08/01/2016#0183;#32;Apatite [Ca 5 (PO 4,CO 3) 3 (OH,F,Cl)] is the most abundant phosphate mineral, which accounts for more than 95% of all phosphorus in the Earths crust and is found as an accessory mineral in most rock types [1] on the Earths surface, primarily because it is stable in a wide variety of geological conditions and over a range of different geological processes [],[],[],[],[],[],[],[].
25/09/2015#0183;#32;Eppawala Rock Phosphate Location Grama Niladhari administrative division in North Central Province, Sri Lanka. It forms part of the Thalawa Divisional Secretariat within the Anuradhapura District. It is situated around 20 kilometers south of the ancient city of Anuradhapura and 150 kilometers north east of Sri Lankan capital Colombo History Before finding the Eppawala appetite deposit from
phosphate The phosphate mineral in soil is found to occur as tricalcium phosphate Ca 3 (PO 4) 2 in combination with either CaCO 3, Ca F 2, Ca(OH) 2 or CaCl 2. The primary mineral is called apatite and its massive form is sometimes called as Phosphorite. The apatite is of igneous origin found as a constituent of granites
Apatite is the main source of phosphorus. Phosphorus was previously extracted from crystalline Apatite, but nowadays is extracted from enormous deposits of Apatiterich rock. Apatite is essential in the manufacture of phosphate fertilizers, and is very important in the chemical and pharmaceutical industries. Apatite is also a popular collectors
Direct use of phosphate rock avoids the extra processing associated with converting apatite to a soluble form. The minimal processing may result in a lowercost nutrient source and make it acceptable for organic crop production systems. Agricultural use. When a watersoluble P fertilizer is added to soil, it quickly dissolves and reacts to form lowsolubility compounds. When phosphate rock is
Apatite may survive rock weather#173; ing for a time to form a phosphaterich residuum, but it breaks down under prolonged exposure. Some of it may be redeposited locally. In highcalcium soils and rocks, apatite is again the min#173; eral formed. Where the terrane consists of igneous rocks, alumi#173; num or iron phosphates such as variscite or strengite are the secondary minerals (Hutchinson, 1952
Apatite: Its uses as a mineral and gemstone
The main source of phosphorus is sedimentary rock containing the calcium phosphate mineral apatite (a group of phosphate minerals). Phosphate rock is mined and either solubilized to produce phosphoric acid or smelted to produce elemental phosphorus. Phosphoric rock is treated with phosphoric acid to produce triple superphosphate or with anhydrous ammonia to produce ammonium phosphate
Phosphate rock and phosphorite are names used for sedimentary rocks that contain at least 15% to 20% phosphate on the basis of weight. The phosphorous content in these rocks is mainly derived from the presence of apatite minerals. Determining which apatitegroup minerals are contained in the rock cannot be determined without laboratory testing because their particle sizes are so small. Most
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