المنتجات الساخنة
Minerals Free Full-Text Production of a
网页2020年8月4日 Apatite is the main source of phosphorous for the making of chemical fertilizers. While apatite is usually recovered from phosphate
Contact
Thermochemistry and Kinetics of the Reactions of
网页2018年9月25日 The main component of phosphate ore derive from fluorpapatite, Ca10 consists in reducing apatite by carbon in presen ce of silica at a temperature up to
Contact
Structure and formation of amorphous calcium phosphate
网页2021年6月1日 As illustrated in Fig. 1 a, the archetypal preparation route of apatite and its precursor ACP is direct precipitation by mixing two solutions that comprise Ca and
Contact
Transformation of amorphous calcium phosphate
网页2018年10月9日 The growth of apatite crystals from amorphous calcium phosphate is an area of intense study. Here, the authors report on the
Contact
A carbonate-rich lake solution to the phosphate problem of
网页Phosphate is central to the origin of life (1–4) because it is a key component of nucleotides, phospholipids, and metabolites such as adenosine triphosphate used in cellular
Contact
Physical and thermal treatment of phosphate ores — An
网页2008年1月31日 When this process was applied to a natural phosphate ore, it was possible to float dolomite from apatite at pH = 4. Hanna and Anazia (1990) described a flotation
Contact
Apatite an overview ScienceDirect Topics
网页Apatite. Apatites are phosphate minerals, and it is the association of the calcium ions that is responsible for the characteristic hexagonal crystal structure and morphology. Detailed
Contact
A Review of Phosphate Mineral Nucleation in Biology and
网页2013年9月28日 The chemical mechanism of phosphorite mineral nucleation in the environment has been a question for over 100 years, as has the chemical mechanism of
Contact
Thermochemistry and Kinetics of the Reactions of
网页2016年5月23日 The principal material in the phosphate ores is composed of calcium fluorapatite Ca10(PO4)6F2, in which the various components have been partially substituted by magnesium, sodium, carbonate, and
Contact
Apatite Phosphate, CalciumFluoride Britannica
网页apatite, any member of a series of phosphate minerals, the world’s major source of phosphorus, found as variously coloured glassy crystals, masses, or nodules. If not for its softness (Mohs hardness 5, compared with the 7
Contact
Minerals Free Full-Text Production of a
网页2020年8月4日 Apatite is the main source of phosphorous for the making of chemical fertilizers. While apatite is usually recovered from phosphate orebodies as the primary product of a mining exploitation, this stone
Contact
Reagents used in the flotation of phosphate ores: a critical
网页2003年7月1日 The simplified flotation flowsheet is given in Fig. 1. In this process, after desliming and sizing, the ore is conditioned with fatty acids and fuel oil at a pH of 9.0–9.5. Then, the apatite is first floated from silica and carbonates in the rougher stage at which 0.8–2.0 lb/ton of fatty acid and 1.0–4.0 lb/ton fuel oil . Flotation reagents
Contact
Full article: Carbonate apatite artificial bone
网页2023年6月20日 In contrast, vertebrates, including humans, have a skeleton of carbonate apatite [CO 3 Ap: Ca 10-a (PO 4) 6-b (CO 3) c] instead of CaCO 3 [Citation 1–5]. A key difference between CaCO 3 and CO 3 Ap
Contact
Causes of phosphate stone formation and the
网页2017年8月23日 that octacalcium phosphate is an unstable precursor in the formation of carbonate apatite urinary stones, as it can be detected in calculi only extremely rarely. Brushite is the more stable precursor, which is formed even in weakly acidic urine (pH 6.5–6.8). Transforma-tion to apatite is possible at pH 6.9 and above, whereby
Contact
Inorganic phosphate in growing calcium carbonate abalone
网页2022年3月21日 Overall, these results evidence that inorganic phosphate can be present at the early stages of calcium carbonate biomineralization in a Ca/P ratio that could lead to apatite precipitation.
Contact
Structure and formation of amorphous calcium phosphate
网页2021年6月1日 As illustrated in Fig. 1 a, the archetypal preparation route of apatite and its precursor ACP is direct precipitation by mixing two solutions that comprise Ca and phosphate species, respectively, typically in the 5–20 mM range with respect to each of Ca 2 + and PO 4 3 −, and sometimes arranging [Ca]/[PO 4] ≈ 1.67 to match that of the
Contact
Phosphorus species transformation and recovery without apatite
网页2020年11月1日 This study demonstrated a novel method of FeCl 3-assisted HTC process for eluting apatite phosphate, fixing phosphate into hydrochar and recovering phosphate as K-struvite in sewage sludge. The HTC process could promote the transformation of organic phosphate and pyrophosphate to orthophosphate, while FeCl 3 assisted the conversion
Contact
Physical and thermal treatment of phosphate ores — An
网页2008年1月31日 When this process was applied to a natural phosphate ore, it was possible to float dolomite from apatite at pH = 4. Hanna and Anazia (1990) described a flotation process developed by Alabama Mineral Resources Institute (AMRI) for selective fatty acid flotation of carbonates from sedimentary apatites in the pH range of 4–6 without
Contact
Phosphate Fertilizer an overview ScienceDirect Topics
网页The Ethyl process utilizes CaF 2, a by-product of the raw material for a phosphate fertilizer: apatite. Apatite contains also silicates, calcium, 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,
Contact
Reagents used in the flotation of phosphate ores: a critical
网页2003年7月1日 Beneficiation of phosphate ores by flotation has been an important part of the concentration process since the 1920s at which time it became possible to recover those fine particles of apatite. Today, more than two-thirds of the phosphate ore produced in Florida and more than half of the world’s marketable phosphate is upgraded by the
Contact
(PDF) Fundamentals of the Wet-Process
网页1996年11月7日 The wet process is the 430 most commonly used phosphoric acid production process, in which H 2 SO 4 dissolves F is the dominant component of natural phosphate rock and its dissolution 434
Contact
On the Modelling of Phosphate Rock Acidulation Process
网页1993年1月1日 Here the reaction of sulfuric acid with both of the main impurities silica and calcite is included. The main steps of the acidulation process as proposed by Becker [ 7] are: 1) Ionization of H 2 SO 4 (3) H 2 SO 4 → 2 H + +SO 4 − 2 this is a very fast reaction. ii) Attack of the H + ion on the phosphate rock particles.
Contact
Two-stage reverse flotation process for removal of
网页2018年10月6日 Phosphate rock contains various gangue minerals including silicates and carbonates which need to be reduced in content in order to meet the requirements of the phosphate industry. Froth flotation has become an integral part of phosphate concentration process. In this study, double reverse flotation was applied to recover apatite from
Contact
Syntheses of hydroxyapatite from natural sources
网页2019年5月1日 The presence of trace elements in some natural HAp mimics the apatite produced from human bone [13].The trace elements are essential in the regeneration of the bone and accelerates the process of bone formation [9].Research by Balamurugan et al. proved that 3–5 mol% silicon added to synthetic hydroxyapatite (Si-HAp) increased cell
Contact
Apatite Formation an overview ScienceDirect Topics
网页Since the degree of supersaturation with respect to apatite increases due to the existence of phosphate ions, apatite formation will thus accelerate itself dramatically. Kawashita M, Lee J-H, Kokubo T, Nakamura T. Surface potential change in bioactive titanium metal during the process of apatite formation in simulated body fluid. J Biomed
Contact
Surface Electrical Behaviors of Apatite, Dolomite,
网页Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan, China; The phosphate ore flotation is achieved through the surface electrical behavior difference among
Contact
Mechanism of Bone Mineralization PMC National Center
网页MINERAL COMPOSITION OF BONE. In 1771, Scheele first reported the presence of calcium phosphate minerals in bone (Scheele 1931).Later, bone mineral was described as a form of hydroxyapatite [(Ca) 10 (PO 4) 6 (OH) 2] comparable to geological apatite (a group of phosphate minerals) by both chemical composition and X-ray diffraction pattern
Contact
Review of the Main Factors Affecting the Flotation of Phosphate
网页2020年12月10日 The overall aim is to control the selectivity and recovery of the process. The following review is an attempt to add to previous works gathering phosphate froth flotation data. In that sense, the relevant parameters of phosphate ores flotation are discussed while focusing on apatite, calcite, dolomite, and quartz as main constituent
Contact
Processes for phosphorus removal from iron ore a review
网页2.2.3.2 Flotation. There are many citations in literature on the reduction of phosphorus in iron ore through anionic flotation, using a fatty acid as collector and sodium silicate as a depressant of iron oxides, when the mainphosphorus-bearing mineral is apatite (Ranjbar, 2002 RANJBAR, M. Dephosphorization of iranian iron oxide fines by flotation.. Erzmetall,
Contact
A mechanism for incorporation of carbonate into apatite
网页2017年8月27日 the role that octacalcium phosphate plays in the process of incorporation of carbonate into apatite. Chemical, X-ray diffraction, and infrared techniques were used. When octacalcium phosphate is hydrolyzed in the presence of sodium and carbonate ions in aqueous media, approximately one sodium and one carbon-
Contact