phosphate rock leaching

Analysis of the kinetic data by different kinetic models indicates that the selective leaching of calcareous material in low-grade phosphate rock with lactic acid is a chemically controlled process. The value of activation energy is found to be 42954.62 J mol −1, which agrees with a chemically controlled reaction.

Leaching Kinetics of Rare Earth Elements in Phosphoric Acid from Phosphate Rock. by. Zhili Li. 1,2, Zhihao Xie. 1,3, Jie Deng. 4, Dongsheng He. 1,*, Hengqin Zhao. 5 and. Huan Liang. 1. Xingfa School …

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 ...

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.

Selective leaching kinetics of calcareous phosphate rock in succinic acid solution was investigated. Using a known particle size range of the sample, liquid/solid ratio and acid concentration, the influence of various reaction temperatures was studied in order to elucidate the kinetics of calcareous material in the rock.

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 containing varying amounts of DPR material and N-Viro soils. DPR fertilizers were made from DPR materials mixing with N-Viro soils at the ratios …

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 …

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 ...

Apatite concentrate is an important source of phosphate and contains significant amounts of rare earth elements (REEs). In this study, the possibility of selective phosphoric acid leaching of ...

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 …

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. …

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 …

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 …

In this paper, the leaching process of phosphate rock enhanced by a rigid-flexible combined impeller was investigated, and the acquired leaching data were used to …

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 ...

The phosphate we are talking about is on the surface of the rocks and sand and is in fairly rapid equilibrium with the water. Minutes and hours, not years and decades. None of the phosphate buried deep in the rock will ever come out (unless some of the rock eventually dissolves away) and is no concern in this context.

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 …

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 ...

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 …

The trends of REE leaching efficiency were similar to those for phosphoric acid (P 2 O 5). Extensive tests on the leaching residue showed that during leaching, about 90 percent of the REEs were released from the phosphate rock but only 52.82 percent ended up in the leaching solution.

Activated phosphate rock holds promising as an alternate due to non-destructive and slow release nature. The objective of this study was to assess the leaching potential of P and trace metals from newly developed activated dolomite phosphate rock (HA-DPR and SLS-DPR), as compared to water-soluble fertilizers, including …

The chemical analysis of the phosphate rock is shown in Table 1. The phosphate rock sample contained 30.1% P2O5 and 44.4% CaO with a CaO/P2O5 ratio … See more

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 …

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 ...

In the 1960s, Janikowski (Janikowski et al., 1961) considered that the main factor affecting the reaction activity of phosphate rock was the specific surface area of phosphate rock, and it was subsequently proved by experiments that the conversion rate of phosphate rock in acid leaching process was indeed only related to the external …

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

Phosphate rock containing rare earth elements (REEs) is considered one of the most promising potential secondary sources of REEs, as evidenced by large tonnages of …

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 ...

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.

A series of experiments of column leaching under different pHs (pH 1.8, 3.8, 6.5, and 8.5) and calcination at different temperatures (200-1100 °C) were carried out for evaluation of release behavior of iodine in phosphate rock. The modes of occurrence of iodine in the phosphate rock and its 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.

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 leaching for 4 h. …

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 …

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 ...

Abstract: 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) resour ce due to ...

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 ...

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 …

whereby 5 tons of phosphogypsum are generated for every ton of phosphoric acid. As worldwide rock phosphate production increases and P 2 O 5 consumption from fertilizers rises, global phosphogypsum output is expected to reach 100–280 Mt per year (Yang et al. 2009).. Phosphogypsum contains significant amounts of trace elements such …

rare earths; phosphorite; wet-process phosphoric acid production; leaching efficiency. 1. Introduction. Phosphorite, or …