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Struvite crystallization is a successful technique for simultaneously recovering PO43− and NH4+ from wastewater. However, recovering PO43− and NH4+ from low-concentration solutions is challenging. In this study, PO43−, NH4+, and NO3− were separated and concentrated from wastewater using bipolar membrane electrodialysis, PO43− and NH4+ can then be …
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US2636806A US163106A US16310650A US2636806A US 2636806 A US2636806 A US 2636806A US 163106 A US163106 A US 163106A US 16310650 A US16310650 A US 16310650A US 2636806 A US2636806 A US 2636806A Authority US United States Prior art keywords calcium acid solution rock phosphate rock Prior art date Legal status …
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A typical process is described as follows: Calculated quantities of concentrated sulfuric acid (60° to 66° B.) diluted with weak phosphoric acid and a recirculated slurry of partly decomposed phosphate rock are fed …
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Sometime colloidal rock phosphate is called soft rock phosphate, but it is no softer than regular rock phosphate. To be effective in crop nutrition, rock phosphate should be mixed well, …
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As far as the study watershed is concerned, if TP leaching concentration of phosphate waste rock eluates is higher than 0.5 mg/L, then the waste rocks in the watershed should be regarded as Type II solid wastes. ... TP leaching concentration data from Method 1314 behaved more distinct partitioning along the pH-dependent release curve. The ...
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The concentration of free H 2 SO 4 was determined by a 4500 SO 4 2− E turbidimetric method (Clesceri, 1998), while the concentration of soluble phosphorus was determined using a 4500-P C vanadomolybdophosphoric acid colorimetric method with a wavelength of 470 nm (Clesceri, 1998). The measurements were done using a Genesys 10 …
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Iodine is commonly found in these matrices, and its concentration must be controlled. The present work describes the development of a novel rapid digestion protocol based on ultrasonic-assisted acid digestion for the determination of iodine in phosphate rock and phosphogybsum samples by Iodometric titration.
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The concentrated concentration of NH4+ and PO43− reached 805 mg/L and 339 mg/L, respectively, which demonstrates that BMED is capable of effectively concentrating and separating PO43− and NH4+. Therefore, BMED can be considered as a pretreatment method for recovering PO43− and NH4+ in the form of struvite from wastewater.
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11.21 Phosphate Rock Processing 11.21.1 Process Description1-5 The separation of phosphate rock from impurities and nonphosphate materials for use in ... radionuclide concentration found in most natural material. Most of the radionuclides consist of uranium and its decay products. Some phosphate rock also contains elevated levels of thorium and its
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September 17, 1940. Different types of phosphate deposits and different sources of phosphate in the United States are briefly discussed. In Florida two types of phosphate are now mined, …
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concentration? Methods We used the Earthchem webportal to com-pile the P concentration of 263,539 rocks. We then gathered data from 62 sites (MAT ranging from 200– 5,000 mmyr-1 assessed the correlation between rock and soil P concentration. Results We found a 30 fold difference in median P concentration among rock types, ranging from
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The invention discloses an acidolysis method of magnesium-containing phosphate rock. The method provided by the invention is characterized by comprising the following steps of: carrying out acidolysis on the magnesium-containing phosphate rock to obtain a water-soluble calcium, magnesium and phosphoric acid containing acidolysis solution, carrying out acidolysis on the …
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Also, the sorption experiment was conducted using nano-particles (n-HAP and n-ZVI) and phosphate rock for Pb 2+ and Ni 2+ with concentration up to 20 mg/l for Ni and 18.0 mg/l for Pb.
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It is produced by two basic technological methods: the 'wet' process and the thermal process. Today, about 85-90% of phosphoric acid production facilities employ the wet process because it is cheaper.
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Phosphate rock is a general term for phosphate minerals that can be used economically, and is an important chemical mineral raw material. It can be used to produce phosphate fertilizers, and can also be used to produce yellow phosphorus, phosphoric acid, phosphide and other phosphates, which are used in medicine, food, matches, dyes, sugar, …
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In this work, uranium(VI) biomineralization by soluble ortho-phosphate from decomposition of the phosphate rock powder, a cheap and readily available material, was studied in detail.Penicillium funiculosum was effective in solubilizing P from the phosphate rock powder, and the highest concentration of the dissolved phosphate reached 220 mg L −1 (pH = 6).
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We found a 30 fold difference in median P concentration among rock types, ranging from 120 ppm (several ultramafic rocks) to >3,000 ppm (several alkali basalts). …
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Phosphate Rock. When phosphate rock, phosphorus concentrate, and fluxes are smelted in an electric arc furnace under temperatures of 1400–1500°C (2552–2732°F), molten slag …
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Results We found a 30 fold difference in median P concentration among rock types, ranging from 120 ppm (several ultramafic rocks) to >3,000 ppm (several alkali basalts). Median P was significantly ...
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By Dr. Fathi Habashi. Figure 1—Typical phosphate losses in Florida. Great effort is spent by the phosphate industry to beneficiate the rock to obtain a concentrate containing 30%-31% P 2 O 5 . [1] During this process, much of the phosphate values are lost to the tailings stream. For example, to obtain 1 ton of rock containing 31% P 2 O 5 ...
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The concentration of 32 elements was determined in phosphate rock samples from the Hazara phosphate deposits of Pakistan using instrumental neutron activation analysis (INAA) technique employing ...
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the phosphorus concentration. 2.2 Only orthophosphate forms a blue color in this test. Polyphosphates (and some organic phosphorus compounds) may be converted to the orthophosphate form by sulfuric acid hydrolysis. Organic phosphorus compounds may be converted to the orthophosphate form by persulfate digestion. 3.0 Sample Handling and …
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7.6 Stock phosphorus solution: Dissolve 0.4393 g of predried (105°C for one hour) KH 2 PO 4 in distilled water and dilute to 1000 mL. 1.0 mL = 0.1 mg P. 7.7 Standard phosphorus solution: …
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reported to be a function of Mg2+ concentration in the nutrient medium[17], and NH 4 ... 2. 1 Materials and methods 2.1.1 Strain and rock phosphate The strain of A. f. was kindly supplied by Central
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Naturally occurring phosphate rock is the only essential source for the production of fertilizers. Heavy metals and phosphate concentrations are quite higher in phosphate rock formed by sedimentary processes. This detail study was conducted to evaluate the heavy metal concentrations in part of the Hazara region, which is the only source of phosphate fertilizer in …
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Turquoise in graphitic slate from Black Range near Cheshunt, Victoria (Scale: 8 cm) Phosphate rock is a general term used to describe natural mineral assemblages of variable composition that have a high concentration …
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Phosphate dust particles generally have the same specific activity as the phosphate rock from which the dust originates. Table 11.21-1. RADIONUCLIDE CONCENTRATIONS OF …
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Rock Phosphate Concentrate. Cannabinoid concentrate means a substance obtained by separating cannabinoids from marijuana by: Cannabis concentrate means cannabis that has undergone a process to concentrate one or more active cannabinoids, thereby increasing the product's potency. Resin from granular trichomes from a cannabis plant is a ...
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In a 3-liter beaker, mix, stirring constantly, 480 milliliters of ammonium hydroxide with 1,400 milliliters of water. Then add 708 grams of 85-percent molybdenum trioxide and continue stirring until clear. Add about half of the molybdate solution (2) to the acid mixture (1) by swirling to prevent precipitation.
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Concentrations of 226 Ra in phosphate rock are reported to vary, covering a range of 1-2 Bq/g. 25‒29 Most of the 226 Ra in the ore ends up in the waste phosphogypsum during the production of phosphate fertilizers. The concentration of 226 Ra in these wastes is reported to be nearly 1Bq/g. 25,27. Transfer pathways of toxic metals and ...
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