Waste rock reprocessing to enhance the sustainability of phosphate …
The form of a phosphate mine waste rock pile depends on two criteria: the disposal method (top-down or bottom-up) and the land surface (flat or horizontal) (Blight, 2009).Different configurations of the mentioned criteria are illustrated in Fig. 3.The top-down disposal method involves discharging waste rock over an advancing face (Fig. 3 A–C …
Uranium recovery from phosphate rocks/minerals
In addition, for 10 g of concentrated phosphate rock, the maximum extraction efficiency was achieved when 50 mL of leaching solution was used. The results of this study showed that the ammonium carbonate/bicarbonate leaching process is effective in extracting approximately 40% of uranium from concentrated phosphate rock.
Rigid-Flexible Combined Impeller Enhancement in Leaching of Phosphate
Conventional rigid impellers are frequently used in the leaching process of phosphate rock, which often form a symmetrical flow field in the reactor, leading to a reduction in the leaching efficiency. In this work, a rigid-flexible combined impeller was applied to the leaching process of phosphate rock to increase the leaching efficiency. …
Leaching kinetics for magnesium extraction from phosphate rock …
A new method of phosphate rock magnesium removal in nitric acid was proposed.. The mathematical model of phosphorus and magnesium release in the process of phosphate rock magnesium removal in the nitric acid method was proposed.. The P 2 O 5 loss ratio could be controlled within 1.3–1.4 % with the MgO removal ratio reaching 85 …
live rock leaching phosphate?
Z Rex said: Bingo. Phosphates will latch on to the rock and sediment until the rate of adsorption equals the rate of release, then it will be in equilibrium, with some phosphates leaving the rock but phosphate in the water binding to the now empty sites. If you put a rock that was in a high phosphate tank into a tank with low phosphates then it ...
Dry rocks leaching | REEF2REEF Saltwater and Reef …
Reaction score. 1,819. Rating - 0%. 0 0 0. waleedreef said: Dry rock is leaching phosphate. Continue curing, salt water, heater and water change every 2 weeks 50%. No need dose anything. You can't stop dry rock from leaching phosphate unless ph is 8.4 and this not possible in cure stage.
Leaching kinetics for magnesium extraction from phosphate rock …
The process of magnesium removal from phosphate rock by the nitric acid method is described by the nuclear shrinkage model with constant particle size (η=C0+Ke-ERT [pH]∑i2αiriτ∑i2βirirθ ...
Bioleaching of rare‐earth elements from phosphate …
01 November 2022. Article history. PDF. Split View. Cite. Permissions. Share. Abstract. Phosphate rock containing rare‐earth elements (REEs) is considered one of the most …
Release behavior of iodine during leaching and …
the phosphate rock and its leaching and calcination residues were extracted with se quential chemical extraction. Iodine in solution and solid samples was measured with ion chromatography (IC) and pyrohydrolysis combined ion chromatography (PIC), respec-tively. Mineralogical compositions of phosphate rock and the leached and calcine d residues ...
Rare Earth and Phosphorus Leaching from a …
Phosphorite, or phosphate rock, is the raw material of phosphoric acid production. It has also been regarded as the most important secondary rare earth element (REE) resource due to low …
Leaching Kinetics of Rare Earth Elements in Phosphoric Acid …
Phosphate rock has been considered as one of the most significant secondary rare-earth resource, and the utilization of rare earth elements (REEs) in phosphate rock has attracted increasing attention. In this study, the leaching kinetics of REEs from a phosphate ore from China was studied with the variation of temperature …
Rare Earth and Phosphorus Leaching from a …
rare earths; phosphorite; wet-process phosphoric acid production; leaching efficiency. 1. Introduction. Phosphorite, or …
Silicate, phosphate and carbonate mineral dissolution behaviour in …
Calcareous phosphate rock: Lactic acid dissolve carbonate material in low grade phosphate rock, therefore, it improved the P 2 O 5 content. The large polarity of O H bond present in strong organic acids, may not react with pure calcium carbonate. However, in dilute solutions, organic acids react in selective leaching of carbonate. Ashraf et al ...
Research Progress in Bioleaching of Phosphate Rock
Phosphate rock is not only a kind of chemical mineral raw material, but also an important strategic resource. Under the background of shortage of phosphate rock resources and serious environmental pollution in China, scientific and rational utilization of precious phosphate rock resources is an effective way to solve this problem. Compared …
Alkali treatment–acid leaching of rare earth elements from
Phosphogypsum (PG) is the main by-product of phosphoric acid, which is produced by the sulfuric acid attack of phosphate rocks, wet process. This by-product, which contains around 2.0% phosphoric acid, is used as a low-cost soil fertilizer, PGF. PGF consists mainly of gypsum (CaSO4·2H2O), P2O5, SiO2, and other impurities, including a …
Leaching of rare earths from Abu Tartur (Egypt) phosphate rock …
The leaching of rare earth elements (REEs) from Egyptian Abu Tartur phosphate rock using phosphoric acid has been examined and was subsequently optimized to better understand if such an approach ...
Activated dolomite phosphate rock fertilizers to reduce leaching …
Properties of phosphate rock vary widely with sources. High-grade of PR contains 25–37% of P 2 O 5 (Gupta et al., 2014). Phosphate rock that contains less P 2 O 5 may not be adequate or profitable for commercial production of phosphoric acid (Fukuda et al., 2013, Mihajlovic et al., 2014, Rosolem and Almeida, 2014). Efficient use of the …
Rigid-Flexible Combined Impeller Enhancement in Leaching of Phosphate
Conventional rigid impellers are frequently used in the leaching process of phosphate rock, which often form a symmetrical flow field in the reactor, leading to a reduction in the leaching efficiency. In this work, a rigid-flexible combined impeller was applied to the leaching process of phosphate rock to increase the leaching efficiency. The effects of …
Release behavior of iodine during leaching and calcination of phosphate
Download Citation | Release behavior of iodine during leaching and calcination of phosphate rock | A series of experiments of column leaching under different pHs (pH 1.8, 3.8, 6.5, and 8.5) and ...
Enhanced leaching recovery of rare earth elements …
Acid leaching is the most frequently used method to solubilize REEs from the phosphate rock-related materials that are in solid forms, such as phosphate rock …
Simultaneous recovery of rare earth elements and
The effects of phosphoric acid concentration, L/S ratio, leaching time, temperature on leaching efficiencies of major components were investigated and leaching efficiencies of 94.3% for REEs and 95.1% for phosphorus from Fanshan phosphate rock are achieved with 30%P 2 O 5, L/S ratio of 10:1 mL/g, 250 r/min
Activated dolomite phosphate rock fertilizers to reduce leaching …
A column leaching study was designed to investigate the leaching potential of phosphorus (P) and heavy metals from acidic sandy soils applied with dolomite phosphate rock (DPR) fertilizers ...
So you were told your rock leaches phosphates? NOT!
Bleach might be the best way to treat this rock, followed by some way to remove the inorganic phosphate that may result (like rinsing in low phosphate water). 2. Rock that, even if once pristine, was exposed to higher than desirable inorganic phosphate concentrations at the end of its time in an aquarium.
Beneficiation of Abu Tartur phosphate rock by leaching …
Abstract. Dilute acetic acid solutions have been used for the leaching of free carbonates contained in Egyptian Abu Tartur phosphate rock by their partial acidulation from the rock.. Acetic acid ...
Simultaneous recovery of rare earth elements and
Phosphate rock has been considered as one of the potential promising resources for rare earth elements (REEs). But the cost issues and the technical …
Enhanced leaching recovery of rare earth elements from a …
Acid leaching is the most frequently used method to solubilize REEs from the phosphate rock-related materials that are in solid forms, such as phosphate rock ore, phosphate concentrate, and phosphogypsum (Wu et al., 2018). Both mineral acids and organic acids have been tested as effective lixiviants to achieve satisfactory leaching …
High-efficiency stabilization of lead in contaminated soil
Phosphate rock powder (PR) has been shown to possess the potential to stabilize lead (Pb) in soil. Most of the phosphorus (P) minerals in the world are low-grade ores, making it difficult to achieve the expected stabilization effect on heavy metals. This study compared the changes in the phase composition and structure of PR and three …
Alkali treatment–acid leaching of rare earth elements …
In general, phosphate rocks contain from about 0.04 to 1.0% REE, which are precipitated with PG. Now, REEs are considered as strategic elements. Therefore, PG is …
In-Situ and Dump Leaching Technology: Application to Phosphate Rock
Ind. Eng. Chem. Res. 1988,27, 2165-2169 2165 In Situ and Dump Leaching of Phosphate Rock Fathi Habashi* and Farouk T. Awadalla Department of Mining & Metallurgy, Lava1 University, Quebec City, Canada G l K 7P4 Phosphate deposits with low carbonate content can be leached in situ or in dumps by dilute HC1 or HNO, to get a solution of …
Beneficiation of Abu Tartur phosphate rock by leaching
4. Conclusions. Abu Tartur phosphate rock can be beneficiated by leaching it with dilute acetic acid. This is due to the fact that dilute acetic acid used in leaching has the ability to react with the calcium carbonate impurity found in the phosphate rock while its attack on the tricalcium phosphate is small.