MTW European Type Trapezium Mill
Input size:30-50mm
Capacity: 3-50t/h
LM Vertical Roller Mill
Input size:38-65mm
Capacity: 13-70t/h
Raymond Mill
Input size:20-30mm
Capacity: 0.8-9.5t/h
Sand powder vertical mill
Input size:30-55mm
Capacity: 30-900t/h
LUM series superfine vertical roller grinding mill
Input size:10-20mm
Capacity: 5-18t/h
MW Micro Powder Mill
Input size:≤20mm
Capacity: 0.5-12t/h
LM Vertical Slag Mill
Input size:38-65mm
Capacity: 7-100t/h
LM Vertical Coal Mill
Input size:≤50mm
Capacity: 5-100t/h
TGM Trapezium Mill
Input size:25-40mm
Capacity: 3-36t/h
MB5X Pendulum Roller Grinding Mill
Input size:25-55mm
Capacity: 4-100t/h
Straight-Through Centrifugal Mill
Input size:30-40mm
Capacity: 15-45t/h
Fluorinecontaining gas in phosphate rock
Phosphoric acid production by attacking phosphate rock with
2017年4月10日 Fluorine recycling process involves several steps starting with the bubbling of the resulting acid gas through hexafluosilicic acid solutions followed by a preconcentration 2022年10月1日 In the process of WPA from phosphate rock, fluorine is generally released as HF and SiF 4 (Long et al, 2020, Wang and Sun, 2020, PawlowskaKozinska et al, 2002, Said et Release and recovery of fluorine and iodine in the production and 2022年6月28日 Wang et al developed a process to remove fluorine during fertilizer manufacturing in an acid digester containing Ca(NO 3) 2, HNO 3, and phosphate rock, using A review of processes for separation and utilization of fluorine 2021年9月3日 Fluorine and phosphorus were distributed in the form of agglomerates in the phosphate rock acidinsoluble residue Fluorine and phosphorus were partially correlated, Existing form and distribution of fluorine and phosphorus in
Existing form and distribution of fluorine and
2022年1月1日 For process reasons, this type of residue still contains a certain amount of fluorine and phosphorus, which has a massive impact on the potential uses of phosphate rock acidinsoluble2021年2月1日 The results showed that fluorine and chlorine in phosphate rock mainly existed in carbonatebound and residual forms The grade of phosphate rock can be well increased by Release of fluorine and chlorine during increase of phosphate rock 2022年10月1日 The results showed, under the optimal digestion condition of phosphate rock, the release rate of phosphorus was 9721 %, with 2514 % of P2O5 in WPA; in gas and liquid Release and recovery of fluorine and iodine in the production and 2020年12月15日 Release of fluorine and chlorine during increase of phosphate rock grade by calcination and digestion A new method was developed for the determination of phosphorus Release of fluorine and chlorine during increase of phosphate rock
Phosphorus and Phosphates SpringerLink
2012年11月19日 Relative to pure fluorapatite, francolite is characterized by the substitution of Na and Mg for Ca and of carbonate and fluoride for phosphate An empirical formula for Unfortunately as much as 80% of the fluorine potentially available from phosphate rock operations is presently discharged into settling ponds as part of neutralization streams and not recovered [4]The Benefits of Isolating Utilizing Fluorine from Phosphate 2016年6月24日 Phosphate rock (PR) is an important mineral resource with numerous uses and applications in agriculture and the environment PR is used in the manufacture of detergents, animal feed, and phosphate (PO43–) fertilizers Leaching or runoff losses from PR products like PO43– fertilizers, animal feeds, and detergents could cause eutrophication of surface waters Phosphate rock: origin, importance, environmental impacts, and 2023年1月15日 Most of the fluorine in phosphate rock will eventually remain in the reaction solution in the form of fluorine ions(F), if not removed, phosphate fertilizer, feed and other products produced by phosphoric acid will cause serious harm to the environment and livestock [1]High fluorine water is mainly caused by the illegal discharge of fluorinecontaining Effective removal of fluorine ions in phosphoric acid by silicate
Review on the Preparation of Cryolite from Industry Waste Containing
2024年5月8日 Rapid development of the fluorine industry has led to mass production of fluorinecontaining waste, and direct discharge of this waste will cause serious environmental pollution of water, atmosphere, soil, and so on Recycling and treatment of fluorinecontaining waste are required for environmental protection and to utilize the fluorine resources Because of @article{Reynolds1929RatioOF, title={Ratio of Fluorine to Phosphoric Acid in Phosphate Rock}, author={D S Reynolds and Kenneth D Jacob and William L Hill}, journal={Industrial \ Engineering Chemistry}, year= {1929 Analytical Chemistry of Fluorine and Fluorinecontaining Compounds P Elving Chemistry 1954; 3 Save Fluorine In animal Ratio of Fluorine to Phosphoric Acid in Phosphate Rock2019年1月1日 While F is an essential constituent of some rockforming minerals such as fluorite and apatite, its major occurrence in the lithosphere is within hydroxysilicate minerals where F − occupies OH − lattice sites The majority of the F occurring in the secondary environment derives from natural weathering processes with some soils derived from Frich parent rocks containing Review Fluorine in the environment, a review of its sources and 2022年12月1日 Phosphate rock (PR) is the core raw material in the production of phosphoric acid and a global strategic resource The fluorinecontaining gas produces H 2 SiF 6 on SiF4 and precipitates silica gel The relevant reaction equations are (7−11) [23], [90], [91]Application prospect of advanced oxidation technology in wet
Efficient and costeffective fluorine recovery from liquidphase
2023年11月15日 In fact, about 90 % of F resources in nature are associated with phosphate rock which usually contains 3–4 % F [8]However, >90 % of phosphate rock are currently used to produce WPA, during which only 40 % of the F is converted into hexafluorosilicic acid (H 2 SiF 6) for recovery [9], [10]The remaining F (about 18 million tonnes of F in China) remains in WPA 2024年2月26日 However, the process of extracting phosphorus from phosphate rock generates several byproducts, including fluorosilicic acid (H 2 SiF 6) (Dahlke et al, 2016) This acid results from the reaction of fluoridecontaining minerals with sulfuric acid, which is used to liberate phosphoric acid from raw phosphate ore ( Joshi, 2022 )Frontiers Production of anhydrous hydrogen fluoride from 2012年6月12日 The fluorine compounds liberated during the acidulation of phosphate rock in the manufacture of phosphoric acid and fertilizers are now rightly regarded as a menace, and the industry is now obliged to suppress emissions of fluorinecontaining vapours to within very low limits in most parts of the world As with any pollution control operation, it is highly desirable for Fluorine recovery in the fertilizer industry – a review2022年1月1日 As the content of PAIR increases from 0 to 35%, the weight loss rate of the PAIR/αHH system changes from 205 to 182, 167, and 142% This mass reduction is mainly due to the thermal Existing form and distribution of fluorine and
Efficient recovery of fluorine from wetprocess phosphoric acid
2024年6月13日 According to data, more than 90 % of phosphate rock was currently used to produce wetprocess phosphoric acid (WPA) in industry [8], [9] During the production process of WPA, fluorine affected the quality of WPA and subsequent products It has been reported that the fluorine in phosphate rock could remain in WPA and enter downstream products2021年2月1日 The results showed, under the optimal digestion condition of phosphate rock, the release rate of phosphorus was 9721 %, with 2514 % of P2O5 in WPA; in gas and liquid phase, the mass percentages Release of fluorine and chlorine during increase of phosphate rock 2010年2月9日 Phosphate rock (phosphorite) is a marine sedimentary rock, which contains 18–40% P2O5 , Phosphate rocks containing up to 120 Furthermore, products require gas purification and tar treatment during HTG (Zhang et al, 2020a)Phosphate Rock an overview ScienceDirect Topics1996年11月7日 Phosphoric acid (H 3 PO 4 ), which is the base material for the industrial production of phosphoruscontaining products, is produced from phosphate rock through both wet and dry processes (Al (PDF) Fundamentals of the WetProcess Phosphoric Acid
Phosphorus and Phosphates SpringerLink
2012年11月19日 Fluorine Recovery Phosphate rock contains about 35% fluorine, some of which is recovered as a byproduct in manufacturing wet process phosphoric acid During acidulation, the fluorine is released as hydrofluoric acid, HF, which reacts with the silica present as an impurity in the rock to form fluosilicic acid, H 2 SiF 62011年10月1日 Phosphate rock always contains fluorine For F/P2O5 ratios, the fluorine content in rock of sedimentary origin ranges in general from 010 to 014 Rock of igneous origin shows lower ratios, from Fluosilicic Acid: Recovery System and Aluminum Fluoride productionDownload Citation On Jan 1, 2024, Yingxin Chen and others published Efficient recovery of fluorine from wetprocess phosphoric acid using silicon powder as a new and ecofriendly reagent Find Efficient recovery of fluorine from wetprocess phosphoric acid OUS phosphate chemicals, fluorine in the rock is evolved as gaseous hydrogen fluoride, silicon tetrafluoride, or a mixture of these two gases It is estimated that 200, 000 tons of fluorine was evolved in processing about 22 million tons of phosphate rock in the United States during 1968 The percentages of fluorine compoundsFluoride Recovery From Phosphorus Production P2 InfoHouse
Study on the fate of phosphorus, fluorine and chlorine in sludge
2024年2月15日 Phosphorus is a basic ingredient of living organisms and one of the most important elements in the production process of agriculture, from which the main source is phosphate rock However, it is estimated that China's phosphate deposits will 2001年1月1日 Phosphate fertilizers are manufactured from the nonrenewable phosphate rock (RP) sources In the future, it has been prospected a scarcity of this sources due to its high demand to enhance crops (PDF) Chemical reactivity of phosphate rocks a Large quantities of fluorine are present in phosphate rock Current US reserves of phosphate rock are estimated to be 1 billion tons, containing about 72 million tons of 100% fluorspar equivalent assuming an average fluorine content of 35% in the phosphate rock World reserves of phosphate rock are estimated to beMineral Commodity Summaries 2024 USGS Publications 2022年6月1日 Stage II (250–480 °C, the average mass loss = 108%) mainly involved the decomposition of pyrite (FeS 2), C 13 H 14 N 2 O 2 S 2 and some fluorinecontaining organic matter Stage III (480–700 °C, the average mass loss = 143%) mainly involved the decomposition of another part of the fluorinecontaining organic matterThermal properties and pyrolysis kinetics of phosphaterock acid
The Phosphate Fertilizer Industry: An Environmental Overview
2012年6月11日 1 IntroductionThey call them “wet scrubbers” – the pollution control devices used by the phosphate industry to capture fluoride gases produced in the production of commercial fertilizerIn the past, when the industry let these gases escape, vegetation became scorched, crops destroyed, and cattle crippledToday, with the development of sophisticated 2019年8月1日 It can be concluded that fluorine and chlorine released by calcination for phosphate rock contribute greatly to atmospheric acid rain and equipment corrosion; by digestion, the discharge of Evolution and distribution characteristics of fluorine during the 2016年1月1日 Summary The benefits of isolating and utilizing fluorine from phosphate rock operations can be summarized as follows: • Addresses an emission problem that impacts human health and the environment • Helps bring a phosphate plant into compliance with current or potential regulations • Offsets the cost of reducing emissions and complying with The Benefits of Isolating Utilizing Fluorine from Phosphate Phosphate rock is also the source of byproduct fluorine Apatite rock phosphate containing 3 to 4% CaF 2 are useful for recovery of fluorite It is recovered as byproduct Hydrofluorosilicic acid obtained from phosphoric acid plants during processing of rock phosphate Phosphate rocks also contain uranium which are considered as significantAPATITE AND ROCK PHOSPHATE Indian Minerals Yearbook 2012
A review of processes for separation and utilization of fluorine
2022年6月28日 This acid results from the reaction of fluoridecontaining minerals with sulfuric acid, which is used to liberate phosphoric acid from raw phosphate ore (Joshi, 2022)2024年4月9日 This study used a new Xray fluorescence (XRF)based analytical method with better precision and sensitivity to evaluate the fluorine concentrations in soil It was hypothesized that the XRF method with a pelletsynthesizing procedure may effectively analyze the fluorine concentrations in soil with ease and reliability The total fluorine concentrations determined Fluorine contamination, mobility, and risks in soils at a phosphate 2016年1月15日 Generally, about 90% of fluorine in nature is associated with phosphate rock [ 6], the associated fluorine overflows in the form of hydrogen fluoride (HF) and silicon tetrafluoride (SiF 4 ) [7]The emission of fluorine gas during incineration of fluoroborate 2018年6月1日 It can be seen from Table 1 that fluoride content in some of the commercially important sources of phosphate rock varies from 22–40 % (w/w)Fluoride content in Indian phosphate rock reportedly varies from 25–38% (w/w) [14]A report from the Indian Bureau of Mines indicates that during 2012–2013 around 21% (217 million metric tons (MMT)) of India’s Study of fluoride content in some commercial phosphate fertilizers
Research progress on preparation and purification of fluorine
2022年1月1日 In addition, the addition of fluorinecontaining highpurity solvents and functional additives can effectively improve the flame retardancy and stability of lithiumion batteries, making lithiumion batteries safer [38], [39] The fluorinecontaining chemicals in the electrolyte components reported in the literature are listed in Table 2phosphate rock with sulphuric acid, fluorine is evolved, mainly as silicon tetrafluoride, along with carbon dioxide and steam This environmentally unacceptable fluoride is required to be removed before being venied to the atmosphere This is usually done by absorbing the gas in water However, industrially theFluorine absorption coefficients in superphosphate den gases2016年12月31日 Aluminium trifluoride is the most important reactant in the process of electrolytic aluminium production [28,55]: 28% of utilized FSA is used to obtain AlF 3 [33]The production technology of AlF (PDF) The Benefits of Isolating Utilizing Fluorine from Phosphate 2016年5月5日 The fluorine gas from the combustion of fuel containing fluorine contributes to human fluorine ingestion [2] A series of experiments for calcination and subsequent digestion to increase the grade of phosphate rock were performed Fluorine and chlorine released by calcination and digestion were investigatedThe emission of fluorine gas during incineration of fluoroborate
Fluorine Compounds an overview ScienceDirect Topics
Industry Profile—Fertilizers Paul N Cheremisinoff PE, DEE, in Waste Minimization and Cost Reduction for the Process Industries, 1995 Phosphoric Acid Liquid Effluent: Fluorine compounds present in the rock phosphate are released during acidulation and filtration operations These emissions contain mainly silicon–tetra–fluoride (SiF 4) and hydrofluoric acid (HF)2017年8月2日 During the reaction of phosphate rock with sulfuric acid, fluorine is evolved and must be scrubbed from the vent gas Table 6 lists the production of phosphoric acid in the recent past and shows the substantial changes in location of P 2 O 5 production over time, particularly in East Asia as China rapidly increased productionPhosphorus and Phosphates SpringerLink2021年2月18日 Hydrofluoric acid, formed from the fluorine in phosphate rock, reacts with the contained silica to give silicon tetrafluoride (SiF4), which is evolved as a gas Host superphosphate plants are equipped with spray towers to absorb the silicon tetrafluoride, which reacts with water to produce fluosilicic acid and gelatinous silicaPhosphate Rock Properties 911Metallurgist2021年8月26日 This situation gives phosphate fertilizer and phosphate chemical producers the opportunity to serve new customers of fluorinecontaining chemicals and reduces the environmental impacts from the Kinetic Study on the Preparation of Aluminum Fluoride Based
Release and recovery of fluorine and iodine in the production and
2022年10月1日 The results showed, under the optimal digestion condition of phosphate rock, the release rate of phosphorus was 9721 %, with 2514 % of P 2 O 5 in WPA; in gas and liquid phase, the mass percentages were 135 % and 9487 % for fluorine, and 6521 % and 2989 % for iodine, respectively
