Fluorine and uranium in phosphate rock processing and waste materials

by Benjamin W. Haynes

Publisher: U.S. Dept. of the Interior, Bureau of Mines in [Washington, D.C.]

Written in English
Published: Pages: 17 Downloads: 838
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Subjects:

  • Fluorine -- Analysis.,
  • Uranium -- Analysis.,
  • Phosphate rock -- Analysis.,
  • Tailings (Metallurgy) -- Recycling.

Edition Notes

Bibliography: p. 14-17.

Phosphate mining involves the extraction of ores containing chemical compounds rich in substances that contain the phosphate ion. These ores vary in their composition, and different varieties of phosphate rock require different mining techniques. Processing of the mined ore follows extractionget price. Extraction yields for uranium were 29%, 38%, 47%, and 16% from phosphogypsum, phosphate rock, waste clay, and amine tailings, respectively. Extraction yields for thorium were 26%, 0%, 38%, and 20% from phosphogypsum, phosphate rock, waste clay, and amine tailings, respectively (see Supplementary Materials). Uranium is a chemical element with the symbol U and atomic number It is a silvery-grey metal in the actinide series of the periodic table.A uranium atom has 92 protons and 92 electrons, of which 6 are valence m is weakly radioactive because all isotopes of uranium are unstable; the half-lives of its naturally occurring isotopes range between , years and billion years. Second place went to Other U.S. Bureau of Mines publications Oxy's Suwannee River Mine. on phosphate included RI , "Fluorine Lesiation and Government Proand Uranium in Phosphate Rock Processing grams.-The Florida Coastal Management and Waste Materials"; RI , "BenefiProgram was approved by the U.S. Departciation of High-Magnesium.

Uranium processing - Uranium processing - Leaching: Roasted uranium ores are leached of their uranium values by both acidic and alkaline aqueous solutions. For the successful operation of all leaching systems, uranium must either be initially present in the more stable hexavalent state or be oxidized to that state in the leaching process. Acid leaching is commonly performed by agitating an ore. Phosphoric acid, essentially free from impurities, is prepared by reacting aqueous hydrofluoric acid with phosphate in particles of calcium bearing phosphate rock to form a calcium fluoride pseudomorph solid from which filter-grade phosphoric acid is separated. By reacting the pseudomorph solid with sulfuric acid and thermally treating the reaction product, the HF can be liberated and recycled. Phosphate rock production and consumption. U.S. production of phosphate rock in was million metric tons, valued at $ billion. Total world production of phosphate rock in was million metric tons. China was the leading producer, with 41 percent of world production, followed by the United States, Morocco and Western Sahara. Some History In , Justus von Liebig, a physician and professor of chemistry at the University of Giessen, Germany, referred to the fact that the phosphate as stored in teeth and bones is ingested with plants which, in turn, take it from the soil, and that this way the soil becomes deprived of important therefore recommended to replenish the soil with a fertilizer prepared by.

Phosphate deposits can contain significant amounts of naturally occurring heavy metals. Mining operations processing phosphate rock can leave tailings piles containing elevated levels of cadmium, lead, nickel, copper, chromium, and uranium. Unless carefully managed, these waste products can leach heavy metals into groundwater or nearby estuaries. Phosphate contained in phosphate ore is generally not directly available without processing. The main relevant method developed to extract P is the wet process to convert commercial phosphate rock into phosphoric acid. First phosphate rock is mined and beneficiated (crushing, milling, washing, flotation, sometimes calcination) to. is the number one paste tool since Pastebin is a website where you can store text online for a set period of time. (2) Although many sources of mining activity are located in remote areas, nearly every state has significant quantities of mineral processing wastes. Waste Rock Large amounts of waste rock are produced from surface mining operations, such as open-pit copper, phosphate, uranium.

Fluorine and uranium in phosphate rock processing and waste materials by Benjamin W. Haynes Download PDF EPUB FB2

Genre/Form: Government publications: Additional Physical Format: Online version: Haynes, Benjamin W. Fluorine and uranium in phosphate rock processing and waste materials.

Materials from phosphate rock mining and processing were analyzed for fluorine and uranium content as part of the Bureau of Mines program to more effectively recover resources Fluorine and uranium in phosphate rock processing and waste materials book mining and mineral processing reject materials.

The analysis of both feed and waste materials generated in the beneficiation and acidulation of phosphate rock was performed to obtain information on the. Source: USGS 1. Phosphate rock (phosphorite) is a marine sedimentary rock which contains % P 2 O 5, as well as some uranium and all its decay products, often 70 to ppmU, and sometimes up to main mineral in the phosphate rock is apatite, and most commonly, fluorapatite – Ca 5 (PO 4) 3 F or Ca 10 (PO 4) 6 (F,OH) is insoluble, so cannot directly be used as a.

phosphate ores therefore contain some level of fluorine. additionally all ores contain some level of silicon. Note the compositional and elemental analyses (partial) of example ores from various locations around the world (Figure 1).

as a result of the compositions noted in Figure 1, all phosphate ore processing produces some amount of fluorine as. It is well known that phosphate rock contains a small amount of uranium. During the production of phosphate fertilizers, most uranium present is found in the phosphate fraction.

Uranium was determined in the 70– ppm range in the phosphate rock and the final products by nuclear and classical by: Fluorine and uranium in phosphate rock processing and waste materials / ([Washington, D.C.]: U.S.

Dept. of the Interior, Bureau of Mines, []), by Benjamin W. Haynes, July A. Jolly, and Gary W. Kramer (page images at HathiTrust). Even thoughtons of fluorine are contained in the 20 million tons of phosphate rock mined in Florida, the fluorine market has been inaccessible because the fluorine is tied up with silica, a hard, glassy material.” Of course, not all of the phosphate industry’s fluoride waste.

Why Uranium from Phosphate. Sustainable Socio-economic development across the Globe will encourage large growth in Nuclear Technology Current Uranium Requirement: MT/yr (Primary 60%, Secondary 40%) • Projected Growth: 10 times by30 times by Economically recoverable Primary Resource: million MT Additional Primary Resource at higher price:.

Abstract. Agricultural applications of chemical fertilizers are a world wide practice. The specific activity of uranium and heavy metals (As, Cd, Cu, Pb and Se) in phosphate fertilizers depends on the phosphate ore from which the fertilizer produced and on the chemical processing of the ore.

Because recovered phosphate fertilizer manufacturing waste contain about 19% fluorine, Bellack concluded that the concentrated "scrubber liquor" could be a perfect water fluoridation agent. It was a liquid and easily soluble in water, unlike sodium fluoride - a waste product from aluminum manufacturing.

When phosphate rock is leached with hydrochloric acid, radium can be removed by co-precipitation with BaCaSO4 and uranium by extraction with a 5% solution of tributyl phosphate in hexane or.

The processing techniques of phosphate ores depend mostly on the type of associated gangue minerals present in the mined rock. In some cases, simple, inexpensive techniques are enough to. @article{osti_, title = {Rare-earth leaching from Florida phosphate rock in wet-process phosphoric acid production}, author = {Liang, Haijun and Zhang, Patrick and Jin, Zhen and DePaoli, D.}, abstractNote = {Phosphorite, or phosphate rock, is the most significant secondary rare-earth resource.

It contains high amounts of phosphate-bearing minerals along with low contents of rare earth. Phosphogypsum is a waste by-product from the processing of phosphate rock in plants producing phosphoric acid and phosphate fertilizers, such as superphosphate.

The wet chemical phosphoric acid treatment process, or ‘wet process’, in which phosphate ore is digested with sulfuric acid, is widely used to produce phosphoric acid and calcium. For every pounds of fluorine contained in the phosphate rock shipped into a phosphate complex, 20 pounds is shipped out in the phosphate product and 20 pounds reports to the gypsum waste product.

The remaining 60 pounds is absorbed by the cooling pond system in plants that do not recover fluorine. @article{osti_, title = {Recovery of fluorine, uranium, and rare earth metal values from phosphoric acid by-product brine raffinate}, author = {Wamser, C A and Bruen, C P}, abstractNote = {A method for recovering substantially all of the fluorine and uranium values and at least 90 percent of the rare earth metal values from brine raffinate obtained as by-product in the production of.

Phosphogypsum is a waste by-product from the processing of phosphate rock in plants producing phosphoric acid and phosphate fertilizers, such as superphosphate. The wet chemical phosphoric acid treatment process, or ‘wet process’, in which phosphate ore is digested with sulfuric acid, is widely used to produce phosphoric acid and calcium sulfate, mainly in dihydrate form (CaSO 4 2H 2 O).

Land-pebble phosphate, hard-rock phosphate, and river-pebble phosphate are the three types of phosphatic rock found in Florida. This report is concerned primarily with the land-pebble deposits, the only type which contains a significant amount of uranium. The most productive part of the land-pebble district is in Polk and Hillsborough Counties, in the west-central part of the Florida peninsula.

Fluorides are industrial waste products created in the production of aluminum, phosphoric acid and phosphate fertilizers. Some 55 years after DuPont began producing uranium hexafluoride for the Manhattan Project, the company still heavily invests in fluorine.

recovered from industrial waste streams. An estimated 8,–10, metric tons of fluorspar are recovered each year from uranium enrichment, stainless steel pickling, and petroleum alkylation.

To supplement fluorspar supplies, fluorosilicic acid is recovered from phosphoric acid plants processing phosphate rock. Extracting Rare Earth Elements from phosphate deposits in. Unfortunately, as their name suggests they are extremely rare; present at extremely low levels in many soils and rock formations around the world, but seldom at concentrations high enough to make extraction viable At the moment around 85% of the world’s Rare Earth Elements.

The book under the secret history of this book is premised on 10 years of investigative work going into the archives of the United States Manhattan Project, going into — AMY GOODMAN:. The effects of mine waste and tailings management on surface waters would depend on the amount and composition of the various waste materials, the methods used in processing the uranium ore, the ways in which the various waste materials are stored and disposed, and the steps taken to reduce the impacts on surface water quality.

The agency estimated Morocco’s uranium resources in phosphate deposits to have reached about 6 million tons, which corresponds to twice the world’s deposits in uranium resources. For each ton of phosphoric acid produced by the processing of phosphate rock, five tons of waste are generated.

This waste takes the form of impure, useless, radioactive solid called phosphogypsum. Somewhere betweenandtons of phosphogypsum waste are estimated to be produced annually worldwide. A photochemical method to remove uranium from a phosphate containing waste in high yield is reported.

The solution resulting from the titrimetric assay of uranium consists of approximately 1 g dm −3 uranium in phosphoric acid (3 mol dm −3).UV illuminated titanium dioxide in a deaerated and 25 fold diluted waste solution (40 ppm uranium) containing a hole scavenger (methanol) almost.

Uranium in phosphate nodules that Chatham Rock Phosphate intends to mine could threaten New Zealand's nuclear-free reputation, the seafood industry has told the Government.

But the Golden Bay-based miner says the uranium is "incidental" and Conservation. Fluorine and Uranium in Phosphate Rock Processing and Waste Materials Haynes BW, Kramer GW, Jolly JA Materials from phosphate rock mining and processing were analyzed for fluorine and uranium content as part of the Bureau of Mines program to more effectively recover resources from mining and mineral processing reject materials.

The first commercial production of phosphate rock began in England in A wide variety of techniques and equipment is used to mine and process phosphate rocks in order to beneficiate low-grade ores and remove impurities.

The eighth chapter of this book deals with mining and beneficiation of phosphate ore. The principle and operating conditions of important parts of.

Uranium processing, preparation of the ore for use in various products. Uranium (U), although very dense ( grams per cubic centimetre), is a relatively weak, nonrefractory metal.

Indeed, the metallic properties of uranium appear to be intermediate between those of silver and other true metals and those of the nonmetallic elements, so that it is not valued for structural applications.

"Handling of radium and uranium contaminated waste piles and other wastes from phosphate ore processing." By G. Schmidt, C. Krüppers; annex by P.

Robinson. Nuclear Science and Technology, Report EUR EN. p. ISBNPublished by the European Commission, Luxembourg ABSTRACT.The solid waste remaining after recovery of uranium in a processing plant are the tailings, consisting of everything that was in the ore except the extracted uranium.

The main radioactive materials remaining are those from the uranium decay series, mainly thorium and radiumPhosphate fertilizer industry in Jordan Table 2. Environmental Fluoride gas concentration in various sections at JPFMC. Jordan, Sampling site * Fluorine concentration (ppm) Samples Range Geometric M f SD > TLV (%) 1 H, PO, Paint Reactor 4f 98 Filter f 13 30% H,PO, tanks f 0 Concentration unit f