Soil is among the most important natural resources that can be degraded in varied forms. Soil degradation is a change in the soil's health that reduces its ability to provide goods and services (FAO and ITPS 2015). Population and income growth are expected to necessitate a 70% increase in global food production by 2050 an…
The discharge of phosphogypsum (PG) on earth surface deposits is a potential source of enhanced natural radiation and heavy metals, and the resulting environmental impact should be considered carefully to ensure safety and compliance with environmental regulations (Bolivar et al., 2000, Shakhashiro et al., 2011).
Source contribution analysis shows three sources derived from the PG deposit: PG, layered salts and gypsum + impurities (REE and U). The last source reaches the city under SW-S-SE winds accounting for a 6% of bulk atmospheric deposition. ... Phosphogypsum (PG) is the main residue of the phosphate fertilizer industry, …
Phosphogypsum, a waste product from manufacturing fertilizer, emits radon, a radioactive gas. It also contains the radioactive elements uranium, thorium and radium. Phosphate rock mining is the …
Not only natural gypsum (NG), but also phosphogypsum (PG), which is a by-product of the synthesis of orthophosphoric acid from phosphorite rock, can be used as a source of raw materials for the production of gypsum materials. PG is produced annually in large quantities throughout the world.
Because the radionuclides within phosphogypsum are a source of radon gas and direct gamma radiation, the EPA regulates phosphogypsum as a source category of radionuclides under the Clean Air Act. Phosphogypsum stacks additionally contain low …
For example, phosphogypsum is today considered a source of building materials, fertilizers, rare earth elements, etc. A similar problem is typical in the agricultural sector, whose waste is recycled inefficiently, especially in developing countries. Research in both directions is now on the rise, and the most relevant are those that involve the ...
Phosphogypsum (PG) is the primary byproduct generated during the production of phosphoric acid, an intermediate product in phosphate fertilizer production, …
The investment of the project is 1.14 × 10 8 CNY; it uses phosphogypsum as the main raw material, coal and electricity as the main energy sources, and glass fiber and filler, and admixture as the auxiliary materials. This project has an annual output of 3.00 × 10 5 tons of building gypsum powder (BGP; therein, 1.32 × 10 5 tons for sales and …
The greatest use of phosphogypsum is in agricultural applications. Researchers proposing new uses must file an application with EPA. Phosphogypsum has been used in agriculture as a source of …
In this study, phosphogypsum was used as source of calcium sulfate and the influence of its solubility (availability) on the properties of SSC was investigated. Mixtures were tested using 10 and 20% phosphogypsum calcined at either 350 or 650 °C, which were more or less soluble, respectively. The largest ettringite formations were …
Phosphogypsum, a solid waste byproduct from processing phosphate ore to make chemical fertilizer, contains radium, which decays to form radon gas. Both radium and radon are radioactive and can ...
Conclusion TSP complex at Chittagong is the main source of phosphogypsum production in Bangladesh. The industry occasionally sales the product at low price but mainly use for landfilling. 5-10% addition of phosphogypsum with Portland cement clinker gave promising results while tested various fresh and hardened …
Only 15% of all phosphogypsum produced in the world is recycled; the remaining volume is stored or dumped into water reservoirs, which causes significant damage to the environment [].In this connection, the search for ways to use PG as a resource for the production of gypsum binders is a promised trend that will solve the environmental …
Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. It is produced in huge quantities (300 MT/year), but only 15% of the PG produced is recycled. ... The concentrations of radionuclides and heavy metals in PG wastes vary considerably depending on the source and nature of the rock …
Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H3PO4) production from natural phosphate rocks. Approximately 4–6 tons of PG is produced per ton of phosphoric acid production, where worldwide PG generation exceeds 300 million tons annually. The vast majority of produced PG is discarded …
Figure showing the utilization of phosphogypsum in China from 2010 to 2019 (Source: National Bureau of statistics of the People's Republic of China). Figure modified from. Download: Download high-res image (186KB) Download: Download full-size image; Fig. 8. Illustration indicating China's utilization of phosphogypsum in 2018.
The waste gases from the incinerator are a heat source for roasting phosphogypsum. Fuel for the handling of phosphogypsum into gypsum is not used. A methodology for determining the specific amount ...
Calcium molybdate (CaMoO4) is of significant interest due to its unique properties and numerous industrial applications, such as catalysis, electrochemistry, and optoelectronics. In this study, we developed an economical and environmentally friendly method to synthesize calcium molybdate from Moroccan phosphogypsum (PG) industrial waste …
Phosphogypsum (PG), a by-product of the phosphate industry, is high in sulfate, (SO 4 2−), which makes it an excellent substrate for sulfate-reducing bacteria (SRB) to produce hydrogen sulfide.This work aimed to optimize SO 4 2− leaching from PG to achieve a high biological reduction of SO 4 2− and generate high sulfide concentrations …
Radium and radon are radioactive and can cause cancer. Phosphogypsum may also contain toxic heavy metals and other carcinogens, such as arsenic, cadmium, chromium, lead, mercury and nickel.
Phosphogypsum (PG) is a residue of the phosphate fertilizer industry that has relatively high concentrations of harmful radioactive materials. The reduction in concentration of the radionuclides from PG was investigated. ... Energy calibration was performed using several certified sealed point sources of known γ-energy lines, namely, …
Phosphogypsum (PG) is the by-product of phosphoric acid plants. The PG dissolves faster, ... Gypsum (CaSO 4 · 2H 2 O) is applied to agricultural soils as a source of nutrients (Ca and S) and as a soil conditioner for amelioration of subsoil aluminum toxicity or for reclamation of sodic soils ...
Phosphogypsum is the main internal source of recycled fine powder-based multi-source solid waste geopolymers, and it is the key to controlling the amount of AFt generated in the system . Therefore, the negative effect of delayed AFt on the geopolymer decreases with a decrease in the phosphogypsum content. The increase in recycled …
Phosphogypsum can be effectively used as a source of calcium sulfate in various syntheses to replace expensive raw materials, provided the material is properly purified and the synthesis process ...
The source of calcium sulfate used for the SSC mortar was phosphogypsum. The choice of phosphogypsum was mainly motivated by its positive environmental impact, as this material is a by-product of the fertilizer industry. This type of waste is very common in Brazil and part of the phosphogypsum generated still needs a …
This study demonstrates the feasibility of using phosphogypsum as the sole CaO source in the preparation of calcium sulfoaluminate cement by considering its mechanical properties and the potential environmental impacts of its large-scale utilization. First, the effects of the alumina/silica ratio on the mineral phase formation, setting time ...
Phosphogypsum is one of the main by-products produced in the production of phosphoric acid in phosphorus chemical enterprises (Gu and Chen, 2020; Kovler, 2012).As one of the main strategic resources in the world, especially in agriculture and military industry, phosphoric acid is produced from the treatment of apatite with sulfuric …
It holds phosphogypsum waste, a radioactive byproduct of phosphate processing – and potential source of rare earth elements. (Serra Sowers/WUFT News) Rare Finds Scientists say Florida phosphates are significant sources of rare earth elements, highly sought for everything from cell phones to EVs.
Phosphorus is a non-renewable vital element and an economic mineral resource that is extensively utilized in various fields such as agriculture, chemical industry, pharmaceuticals, light industry, and national defence. 1–4 As of 2008, China has been the world's largest producer of phosphate rock, accounting for more than 50% of the world's …
حقوق النشر © 2024.Artom كل الحقوق محفوظة.خريطة الموقع