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Phosphate acidulation utilizing HF acid - US Patent 6676914 ..... or of an alkaline earth metal with hydrochloric acid or hydrofluoric acid in excess "as ... which uses sulfuric acid to digest the phosphate rock.)
Phosphoric acid is a moderately strong inorganic acid of a reducing nature, a syrupy liquid. It may be produced directly by absorption of phosphorous pent-oxide in water ( in which case there are few contaminants) or as crude, contaminated product, from the digestion of phosphate rock with sulfuric acid. In the later case,
8.2 Stock acid solution, 5.6M Sulfuric Acid: Dilute 310 mL of concentrated H2SO4 to 1 L with Double de-ionized water. 8.3 Working digestion acid solution: Dissolve 12.8 g ammonium persulfate and 32 mLs of 5.6M H2SO4 in a 100-mL volumetric flask. Dilute to mark with double de-ionized water. Prepare daily.
Inasmuch as crude sulfuric acid manufactured from pyrite and other sulfide ores, especially by the chamber process, usually con- ... The method comprises the digestion of the sample with a mixture of sulfuric and nitric acids, the distillation ... As phosphate rock usually contains 3 .
Phosphoric acid is a colorless, clear and odorless liquid. It is a strong inorganic acid with the chemical formula H3PO4. It can be produced by absorbing phosphorous pentoxide directly in water or through the digestion of phosphate rock with sulfuric acid. The most common form of phosphoric acid is an 85 percent aqueous solution.
Phosphate rock of 70 to 75% BPL, or as high as is reasonably obtainable, is finely ground in a ball mill and then mixed with cooled recycled phosphoric acid-gypsum slurry in a digestion tank (Figs. 10.3 and 10.4).At this stage the only reaction which occurs is between acid and any carbonates present in the rock, and between phosphates and low concentrations of sulfuric acid which may be ...
phosphate ore with sulfuric acid as an acidulate [23]. The decomposition of phosphate rocks using aqueous sulfuric acid has been studied by several authors [24-31]. Sevim et al. [24] dissolved Turkish mineral phosphate in sulfuric acid at 14–70ºC showing that the reaction rate belongs to a solid-to-liquid ratio, temperature and particle size.
limestone (CaCO3) present in the phosphate rock reacts with sulfuric acid (H2SO4) releasing carbon dioxide (CO2). The amount of carbon in the phosphate rock feedstock varies depending on the region in which it was mined. Phosphate rock is also used to produce triple super phosphate and elemental phosphorus. 2. Total Emissions
However phosphate rocks decomposition by sulfuric acid remains the most widely used method and over 90% of the phosphoric acid produced worldwide is manufactured by digestion of phosphate rocks with sulfuric acid as an acidulant [21] Dissolution of phosphate ore using sulfuric acid was examined by many researchers [23] [30]
May 01, 2002· Comparison between acidulation by sulfuric acid and by phosphoric acid for Saudi phosphate rock. Fertilizer Research 1991, 29 (2), 209-227. DOI: 10.1007/BF01048962. Yeong Koo Yeo, Young Sang Cho, Woo Hyun Park, Bong Kyu Moon.
phosphoric acid) and mono phosphate - and diammonium. The basic raw materials consist of phosphate rock, sulfuric acid (typically produced within the factory from elementary sulfur) and water. 4. All fertilizers are made of potassium from brines or underground potash deposits. The major forms are comprised of chloride, sulfate and potassium ...
Oct 30, 2009· Potentially harmful phosphate-based products derived from the wet acid digestion of phosphate rock represent one of the most serious problems facing the phosphate industry. This is particularly true for dicalcium phosphate (DCP), a food additive produced from either sulphuric acid or hydrochloric acid digestion of raw rock material.
Sulfuric acid (American English) or sulphuric acid (English spelling), also known as oil of vil, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with molecular formula H 2 SO 4.It is a colorless, odorless, and viscous liquid that is soluble in water and is synthesized in reactions that are highly exothermic.. Its corrosiveness can be mainly ascribed to its strong ...
DSM 15 CRO KMO 5 april 1985 Development of a 'clean' phosphoric acid process Author: K. Weterings, Central Laboratory DSM, Geleen, The Netherlands Summary The current 'wet' phosphoric acid processes are based on the digestion of phosphate rock with sulphuric acid.
Evaporation Technology into its New Phosphate Project in Egypt. May 26, 2016 ... HPD systems are key components to ensure the final production of ... metric tons (MT) of di-calcium phosphate (DCP), 33,600 MT of purified phosphoric acid ... and results from the reaction of hydrochloric acid with low-grade.
acid and waste solids. Phosphoric acid is a major component of many fertilizers. It is mainly produced by digestion of phosphate ore (fluoroapatite) with sulfuric acid. This yields phosphoric acid as a product and hydrated calcium sulphate as a by-product.
Abstract. Phosphate rock and sulfuric acid are the two major raw materials for manufacture of phosphate fertilizers. Nearly all commercial phosphate fertilizers are derived from phosphate rock; the major exception is basic slag which derives its phosphorus indirectly from phosphate minerals that are present in iron ore or deliberately added to the iron blast furnace charge.
US2778712A US441150A US44115054A US2778712A US 2778712 A US2778712 A US 2778712A US 441150 A US441150 A US 441150A US 44115054 A US44115054 A US 44115054A US 2778712 A US2778712 A US 2778712A Authority US United States Prior art keywords rock aqueous medium digestion potassium chloride calcium Prior art date 1954-07-02 Legal status (The legal status is an .
phosphate rock digestion with hydrochloric acid For each project scheme design, we will use professional knowledge to help you, carefully listen to your demands, respect your opinions, and use our professional teams and exert our greatest efforts to create a more suitable project scheme for you and realize the project investment value and ...
Many of the world's phosphate rocks contain 10's of PPM of cadmium. Sulphate ions: All phosphates contain some sulfate. This corresponds to free sulfate and is advantageous when calculating the sulfuric acid required digesting the phosphate rock. However, it is relatively constant at about 0.8% in most phosphate rocks. Carbonate ions:
However, phosphate rocks decomposition by sulfuric acid remains the most widely used method and over 90% of the phosphoric acid produced worldwide is manufactured by digestion of phosphate rocks with sulfuric acid as an acidulant [21] . Dissolution of phosphate ore using sulfuric acid was examined by many researchers [23] [30] . Get Price []
May 15, 2008· The dihydrate process for the production of phosphoric acid is increasingly important as the basis for phosphate fertilizer plants. The process involves dissolution of phosphate rock in an aqueous mixture of phosphoric and sulfuric acid and subsequent crystallization of calcium sulfate dihydrate from the product phosphoric acid solution.
It is conventional practice to recover the phosphatic value of phosphate rock by digestion of the rock with sulfuric acid. Regardless of whether this digestion is carried out with sufficient acid to form a product consisting predominantly of monocalcium acid phosphate or with a lesser amount of acid to form a superpho-sphate, the digestion ...
Jan 01, 1992· The phosphate rock, mixed with a weaker recycle acid is fed underneath the layer and an anti agent is used to control the thickness of the . Best filtration results are obtained by feeding sulfuric acid at the top of the layer. Gentle stirring is a .
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