According to the value of K at different temperatures in Table 4, the Arrhenius plots for phosphate rock dissolution of 150– 180 μm and 61– 75 μm particles were drawn in Fig. 12. …
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For the NBS urban particulate matter, the results agree with the certified value and with the 70 pg g' (standard deviation 6 pg g') obtained by Greenberg [7] using thermal neutron …
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To take full advantage of rock phosphate, therefore, activation techniques are required. Activation techniques can include acidulation to increase the availability of phosphorus to crops, as well as combining with organic …
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Phosphate rock deposits are present in colossal quantities worldwide as many countries like China, Jordan, Egypt, USA, Morocco, ... The activation of PR was carried out by …
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In recent years, many methods have been developed to activate phosphate ore powder, such as dissolving phosphate ore powder by phosphate solubilizing microorganisms, modifying organic …
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apparent activation energy of the dissolution of REEs from phosphate rock using the phosphoric acid solution was -19.6 kJ/ mol. D2EHPA was subsequently applied as an organic solvent for …
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Phosphorus (P) build-up in agricultural soils as a consequence of excessive P fertilizer application necessitates the exploration of soil P pool for crop supply. We conducted a …
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The on-line analysis of phosphate rock slurry for incorporating such process control is therefore required. NMR and colorimetry methods have been evaluated for on-line analysis of phosphate …
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In this study, it is calculated that the activation energy for the magnesium removal from phosphate rock by the nitric acid method is 21.83 kJ/mol, and the frequency factor k is …
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Mechanochemical treatment is an effective and ecological way to treat medium and low-grade phosphate rock (PR) for fertilizer. To explore the phosphorus (P) solubility mechanisms of mechanochemically activated …
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Generally, phosphate rock contains about 0.05 wt% rare earth elements (REEs) on average. And the world commercial phosphate rock production is estimated to be 250 million …
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PR Phosphate rock powder - MP Mechanical activation of phosphate rock powder for 60min - MPB Activation of phosphate rock powder to bentonite mass ratio 1:1 for 60 min - MPK …
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The activation process of phosphate rock contributes to the increasing of its surface area. The EDAX spectrums of phosphate rock samples before and after activation are …
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The phosphate industry in Central Florida produces significant amounts of dolomite phosphate rock (DPR) in the mining sites. If the DPR materials can be converted into slow …
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Ultrafine grinding activations of phosphate rock and their dynamic phosphorus releasing rates were investigated by using the vibration mill wet grinding processing method in which the …
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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, …
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The low-grade phosphate rock (LPR) was produced from Kunming, Yunnan Province, with a total P 2 O 5 content of 21.95%, and the available P (P 2 O 5) content is less …
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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 …
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To improve the efficiency of the nutritional and environmental functions of phosphate rock, organic molecules including oxalic acid, humic acid, and sodium …
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As high-grade phosphate reserves begin to diminish worldwide, low-grade phosphate rock such as that containing dolomite [CaMg (CO)] needs to be explored as a potential fertilizer. …
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The apparent activation energy of the dissolution of REEs from phosphate rock using the phosphoric acid solution was -19.6 kJ/mol. D2EHPA was subsequently applied as an organic solvent for REEs ...
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Cadmium (Cd) pollution and phosphorus (P) leaching in paddy soils has raised the global concern. In this study, two kinds of the low grade phosphate rocks activated by the …
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The activation of dolomite phosphate rock with selected organic molecules resulted in a substantial increase in water-soluble P and the P amendment continuously …
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Phosphate rock denotes the product obtained from the mining and subsequent metallurgical processing of P-bearing ores. In addition to the main phosphate-bearing mineral, PR deposits …
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Partial acidulation of phosphate rock. Partially acidulated phosphate rocks (PAPRs) are prepared by reacting PRs, usually with H 2 SO 4 or H 3 PO 4, in amounts less than that needed to make …
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The apparent activation energy of the leaching process was found as 64.92 kJ mol −1 over the reaction temperature range from 313 to 353 ... the phosphate rock in the Lagarban …
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The apparent activation energy of the leaching process was 42954.62 ... Phosphate rock is the only major source for phosphatic fertilizers and phosphorous-based chemicals. …
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Rock phosphate constitutes a natural phosphorus (P) source for organic farming systems, but with a limiting direct agricultural use due to its poor inherent reactivity. Thus, this …
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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 …
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Laboratory and greenhouse experiments including those of Mokuwunye and Chien (1980), Chien and Hammond (1988), and Kpomblekou et al. (1991) were initiated to evaluate …
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