• US2683075ADigestion of phosphate rockGoogle Patents

    Digestion of phosphate rock Download PDF Info Publication number US2683075A. US2683075A US230077A US23007751A US2683075A US 2683075 A US2683075 A US 2683075A US 230077 A US230077 A US 230077A US 23007751 A US23007751 A US 23007751A US 2683075 A US2683075 A US 2683075A Authority US United States Prior art keywords rock calcium acid alkali metal

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  • Dissolution of Djebel Onk phosphate ore using sulfuric acid

    However phosphate rocks decomposition by sulfuric acid remains the most widely used method (Sinirkaya et al. 2014 IMPHOS 2004) and over 90 phosphoric acid produced worldwide is manufactured by digestion of phosphate rocks with sulfuric acid (Calmanovici et al. 1997).

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  • The True Cause of Acid Refluxrealfoodforager

    The main acidifying agents in the body result from the digestion of proteins and grains. There are three strong acids sulfuric acid phosphoric acid and nitric acid. These are strong enough to burn a hole in your clothes. Acidifying Agents are Weak Acids

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  • The digestion of phosphate ore in phosphoric acid

    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.

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  • Rock Phosphate Impurities And The Impact On Manufacturing

    Jun 21 2012 · Rock phosphate demand worldwide for manufacturing phosphoric acid is growing exponentially. The availability of good quality rock phosphate is limited. Till the end of last century rock phosphate quality was good and little attention was given to the effect of impurities associated with these rocks.

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  • PROCESS FOR THE PRODUCTION OF PHOSPHORIC ACID AT A

    Apr 04 1972 · A process for the production of phosphoric acid at a high concentration and a gypsum by-product of improved quality which comprises the steps of mixing phosphate rock with phosphoric acid containing 36 to 44 P 2 O 5 digesting the mixture with sulphuric acid precipitating 70 to 80 of the calcium oxide in the phosphate rock as calcium sulphate hemihydrate in a first digester and

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  • Sulfuric acidWikipedia

    Sulfuric acid (alternative spelling sulphuric acid) also known as vitriol 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.

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  • The Manufacture of Sulfuric Acid and Superphosphate

    The phosphate rock is ground until at least 75 is less than 75 ˜m (microns) in diameter and then analysed for composition. The proportions of various minerals present are altered to give the desired composition. Step 2Superphosphate manufacture Phosphate rock sulfuric acid and water are mixed and then allowed to dry and

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  • Radioactivity contents in dicalcium phosphate and the

    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.

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  • Dissolution of Djebel Onk phosphate ore using sulfuric acid

    However phosphate rocks decomposition by sulfuric acid remains the most widely used method (Sinirkaya et al. 2014 IMPHOS 2004) and over 90 phosphoric acid produced worldwide is manufactured by digestion of phosphate rocks with sulfuric acid (Calmanovici et al. 1997).

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  • Phosphate Rock and Sulfuric Acid SpringerLink

    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.

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  • phosphate rock digestion with hydrochloric acid

    phosphate rock digestion with hydrochloric acid. Rock Phosphate Digestion By Hcl Route In India PROCESS TECHNOLOGY Hydrochloric acid is available in four concentrations ranging from (a) 12 to . acid production and the temperatures at which rock phosphate is digested with sulfuric acid .

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  • Attack of Tunisian Phosphate Ore by a Mixture of Sulfuric

    improve the performance of phosphate attack. However phosphate rocks de-composition by sulfuric acid remains the most widely used method 30 29 21 32 and over 90 of the phosphoric acid produced worldwide is manufac-tured by digestion of phosphate rocks with sulfuric acid

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  • phosphate rock digestion with hydrochloric acid

    digestion of phosphate rock with hclnatureslimsecretscoza. digestion of the phosphate rock with sulphuric acid and hydrochloric acid is commonly used for dicalcium phosphate production both acids used also lead to the enhancement of several radionuclides within the final product 7 8 .

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  • The Manufacture of Sulfuric Acid and Superphosphate

    The phosphate rock is ground until at least 75 is less than 75 ˜m (microns) in diameter and then analysed for composition. The proportions of various minerals present are altered to give the desired composition. Step 2Superphosphate manufacture Phosphate rock sulfuric acid and water are mixed and then allowed to dry and

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  • phosphate rock digestion with hydrochloric acid

    Phosphate acidulation utilizing HF acidUS 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.)

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  • Method 3031 Acid Digestion of Oils for Metals Analysis by

    ACID DIGESTION OF OILS FOR METALS ANALYSIS BY ATOMIC ABSORPTION OR ICP SPECTROMETRY 1.0 SCOPE AND APPLICATION 1.1 This method is an acid digestion procedure for analysis of oils oil sludges tars waxes paints paint sludges and other viscous petroleum products for the sixteen toxic elements listed below Antimony Arsenic Barium Beryllium

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  • Comparison between acidulation by sulfuric acid and by

    A detailed investigation of two phosphate rock acidulation modes has been carried out in batch acidulators. The classical dihydrate process rate is affected by the coating of the rock particle by gypsum. The clean phosphoric acid process using phosphoric acid as an acidulation agent does not suffer from this inhibitory coating effect however it is affected by the increasing viscosity of the

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  • Phosphoric acidEssential Chemical Industry

    Phosphoric acid is produced from fluorapatite known as phosphate rock 3Ca 3 (PO 4) 2.CaF 2 by the addition of concentrated (93 ) sulfuric acid in a series of well-stirred reactors. This results in phosphoric acid and calcium sulfate (gypsum) plus other insoluble impurities.

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  • Attack of Tunisian Phosphate Ore by a Mixture of Sulfuric

    improve the performance of phosphate attack. However phosphate rocks de-composition by sulfuric acid remains the most widely used method 30 29 21 32 and over 90 of the phosphoric acid produced worldwide is manufac-tured by digestion of phosphate rocks with sulfuric acid

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  • Air QualityFlorida Industrial and Phosphate Research

    Florida Industrial and Phosphate Research Institute > About Us > Phosphate Primer > Air Quality. emitted from sulfuric acid operations at phosphate chemical processing plants is very low compared to that emitted from power plants. It is however highly regulated because in high enough concentrations it could cause severe damage to the

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  • Phosphate Rock Treatment with Hydrochloric Acid for

    The present paper deals with the treatment of phosphate obtained from a commercial sample of Akashat phosphate ore in hydrochloric acid. The factors studied are effects of the temperature of dissolution acid concentration and the time required for

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  • Dissolution of Phosphate Rock by Mixtures of Sulfuric and

    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. In this study the mechanisms of dissolution of phosphate rock

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  • Effect of Impurities in Phosphoric Acid on the

    of phosphoric acids namely A B and C produced from digestion of three different phosphate rocks in sulfuric acid is given in Table 1. When acid A is used the size range of produced DAP granules is mostly within 1-3 mm whereas for type C acid too coarse gran-ules are produced which overloads the crushers resulting in too fine

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  • Minerals Free Full-Text Rare Earth and Phosphorus

    Although the consumption of sulfuric acid in phosphate rock digestion can be calculated based on Equation (1) and the phosphorus leaching efficiency it is hard to accurately determine the total amount of sulfuric acid that reacted with calcium-bearing minerals during leaching

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  • Antifoams for Phosphoric Acid Production

    There are a variety of ways to produce phosphoric acid but the most common is the Wet Process. Commonly used in the production of phosphate fertilizers Dispelair® antifoams are used to control foaming during the digestion of the phosphate rock with sulphuric acid.

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  • sulfuric acid draft 2-8-06Agricultural Marketing Service

    61 Sulfuric acid is the world s largest volume industrial chemical in terms of production (ADEH 2003 EPA 62 1993) more sulfuric acid is produced in the United States than any other chemical (NSC 2005). The main 63 use is in the production of phosphate fertilizers that convert phosphate rock to phosphoric acid

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  • Dissolution of Phosphate Rock by Mixtures of Sulfuric and

    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. In this study the mechanisms of dissolution of phosphate rock

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  • EVALUATION OF POTENTIAL COMMERCIAL PROCESSES

    The reaction occurs when ground phosphate rock is continuously fed into an agitated reactor containing concentrated sulfuric acid unattacked phosphate rock recycled phosphoric acid and gypsum crystals. Free sulfuric acid dissolves tricalcium phosphate to yield a dilute phosphoric acid solution and hydrated calcium sulfate.

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  • Rock Phosphate Reaction With Sulphuric Acid Cromalinsupport

    Come to Citysearch to get information Rock Phosphate Reaction With Sulphuric Acid directions and reviews on Green Grass Fertilizer Weed and other Landscaping in Caledonia MI . That brought out a rich green aura to the yard. Some plants like high nitrogen fertilizers so like low nitrogen fertilizers.

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  • What is the chemical equation for the preparation of super

    Nov 29 2009 · single super phosphate or superphosphate of lime Ca(H 2 PO 4 ) 2 is a compound produced by treating rock phosphate with sulfuric acid or phosphoric acid or a

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  • Radioactivity contents in dicalcium phosphate and the

    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.

    Get Price
  • PRODUCTION OF PHOSPHORIC ACIDProduct Stewardship

    Phosphate rock Phosphoric Acid Sulphuric Acid Nitric Acid No. 5 Urea UAN AN CAN NPK (nitrophosphate route) NPK (mixed acid route) K Mg S micronutrients Calcium carbonate Phosphate rock K Mg S micronutrients No. 6 No. 7 No. 4 No. 8 No. 3 Phosphate rock. 3 CONTENTS PREFACE 4 DEFINITIONS 6 1. INTRODUCTION 7 2. DESCRIPTION OF PRODUCTION

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  • 1. Introduction

    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 .

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  • Dissolution of Calcareous Phosphate Rock from Gafsa

    solved in various acids (phosphoric nitric sulfuric mix- ture phosphoric/sulfuric). Sardisco . et al. 1 investigated the digestion of low-grade phosphate ores using phos- phoric acid. Several studies 2-8 have shown that the calcium car- bonate content of phosphate rocks can be reduced by cal- cinations or by acid leaching Ben Brahim

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