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Request PDF | Effects of topography and soil properties on soil selenium distribution and bioavailability (phosphate extraction): A case study in Yongjia County, China | Selenium (Se) is an ...

Total P and soil P fractions by sequential chemical extraction. Soil total P (TP) ranged from 0.6 to 2.0 g kg −1 with an average of 0.79 g kg −1 (Table 1).It was highest in the 900-yr soil.

Phosphorus (P) flow from rock phosphate extraction to grain production in China under different treatments: (a) FP, (b) OPT1, and (c) OPT2. FP, OPT1, and OPT2, respectively, represent mineral P use according to farmer practices, optimized use based on soil fertility and the soil-testing approach, and optimized use based on the principle of the ...

Although with a relatively large phosphate rock reserve, around 70% of China's phosphate rocks are classified as low grade (Li et al., 2016a). In 2010, China was the most significant global phosphate rock producer (37.5% of the world's total) and consumer (30% of the world's total), and was responsible for 50% of Asian's overall ...

A simple approach for preparing high-efficiency and cost-effective adsorbent to extract uranium in nuclear wastewater is essential for safeguarding the environment. This study introduces an easy procedure to synthesize phosphate-rich biochar (PS) from sawdust by treating it with phosphoric acid before carbonization (700 °C). The sample …

Environmental impact and economic assessment of recycling lithium iron phosphate battery cathodes: Comparison of major processes in China. ... Acid-free extraction exhibits the lowest environmental impacts, while those of acid-leach precipitation and sulfide roasting are relatively high; 2) Laboratory-level processes with lower direct …

Conventional wet-process phosphoric acid (WPA) extraction route encounters unsatisfactory extraction efficiency, phosphorus yield, and raffinate utilization. Herein, a new extraction route for H3PO4 separation from wet-process superphosphoric acid (WSPA) is proposed to improve these dilemmas. We focus on the equilibrium of …

In 2023, records show Tunisia has become the second largest rock phosphate reserve holder after making its first and only revision with an 185% increased …

PARFORCE Technology is an industrial process for the extraction of phosphate from secondary raw materials. The acronym stands for "Phosphoric Acid Recovery From Organic Residues and Chemicals by Electrochemistry". Dr. Barbara Böck, Editor-in-Chief of Chemie Ingenieur Technik (CIT), talked to Professor Martin Bertau, …

Here, we propose a well-designed thermal oxidation strategy for pyro-process-based Li extraction from spent LiFePO 4 (S-LFP), which involves the application of a molten sulfate infiltration–oxidation synergistically controlled reaction occurring at a low temperature (300 °C) and constitutes a one-step preparation with high lithium recovery ...

1.Introduction 1.1.Massive phosphorus loss and its risks. Human-induced intensive food production has led to a threefold increase in global phosphorus mobilization, facilitated …

Domestic Production and Use: In 2021, phosphate rock ore was mined by five companies at 10 mines in four States and processed into an estimated 22 million tons of marketable product, valued at $1.7 billion, free on board (f.o.b.) mine. Florida and North Carolina accounted for more than 75% of total domestic output; the remainder was produced in ...

In 2023, records show Tunisia has become the second largest rock phosphate reserve holder after making its first and only revision with an 185% increased adjustment alongside China reducing their ...

Published by Statista Research Department, Feb 8, 2024. China dominated worldwide production of phosphate rock in 2023, with production amounting to 90 million metric tons. Approximately 35 ...

The removal of trivalent iron and aluminum was studied from synthetic Li-ion battery leach solution by phosphate and hydroxide precipitation (pH 2.5–4.25, t = 3 h, T = 60 °C).

Sedimentary phosphorus fractions. Total phosphorus (TP) was analysed using the (standards, measurements and testing) SMT separation method (Ruban et al. 1999, 2001).The procedure for the extraction of phosphorus fractions from sediments was based on the improved Psenner continuous extraction method (Koop et al. 1990).The …

4. Russia. Mine production: 13 million MT. Russia's phosphate output also dropped by 1 million MT in 2022 from the previous year, coming in at 13 million MT. As per the US Geological Survey, the ...

The order of basicity is the same as that above. Consequently, the trialkyl phosphine oxides are the most basic among these extractants. 17 Among these neutral phosphorus extractants, tritutyl phosphate (TBP) is the earliest applied in rare earth extraction separation. 18 Extraction of scandium from. Acid phosphorus extractants

The migration and transformation of phosphorus components in wastewater treatment plants (WWTPs) play a crucial role in the convergence and circulation of phosphorus. However, the composition and variation of dissolved organic phosphorus (DOP) in WWTPs were unclear because of its complex nature, hindering its efficient …

Moreover, Morocco was the main producer of phosphate worldwide in 2021, after China. ... "Extraction of phosphates in Morocco from 2018 to 2020 (in 1,000 metric tons)." Chart. February 10, 2022.

Phosphate rock extraction from its ore, and its subsequent conversion into fertilizer materials and industrial chemicals, is a relatively mature art. ... For example, iodine is recovered in China during phosphate mining. In Santa Quitéria, Brazil, a joint venture between government and a private company will annually produce 1500 tons of ...

Affiliations 1 Department of Forensic Medicine, Huazhong University of Science and Technology, Hangkong Road #13, Wuhan, 430030, Hubei, China.; 2 Department of Forensic Medicine, Huazhong University of Science and Technology, Hangkong Road #13, Wuhan, 430030, Hubei, China. Electronic address: …

More than 40 countries are extracting phosphate rock from phosphate deposits. China, Morocco, USA, and Russia are the top four phosphate producers, accounting for around 79% of the total global production (Ruan et al., 2019). The countries producing more than 1 Mt/year are presented in Fig. 1 (USGS, 2022). Download : …

Phosphate rock in Guiyang (Southwest of China) is used for the phosphate production, and hence generating a by-product phosphogypsum (PG). From 2007, part of the PG was used as main raw material ...

This work was funded by the National Natural Sciences Foundation of China (No. 41502329, 41877299), ... Effects of topography and soil properties on soil selenium distribution and bioavailability (phosphate extraction): a case study in Yongjia County, China. Sci. Total Environ. (2018)

Phosphate rock as a low-cost bulk commodity (1945–2000) The commodity chain of phosphate fertilizer starts with the extraction of phosphate rock, typically in large open-pit mines. The raw material is transported from the mine into industrial plants where phosphoric acid Footnote 5 is produced in a chemical process by adding sulfuric acid.

The near-surface seawater from China's Fujian Province served as the natural seawater for the extraction experiment. ( Fig. 4 g). The above seawater was used for the continuous uranium extraction in seawater, and 1.0 g of CGPA was used for continuous extraction in seawater at 293 K, the actual seawater's UO 2 2+ extraction rate could be …

@article{Xu2018EffectsOT, title={Effects of topography and soil properties on soil selenium distribution and bioavailability (phosphate extraction): A case study in Yongjia County, China.}, author={Yuefeng Xu and Yong-hua Li and Hairong Li and Li Wang and Xiaoyong Liao and Jing Wang and Chang Kong}, journal={The Science of the total …