The sequential batch extraction process is performed by regularly adding fresh leaching medium in the process of the leaching experiment to simulate the leaching …

Fig. 3 displays the Hg distributions in the five extraction fractions of the FGD gypsum samples from different parts of China. The results show that although strong complex Hg was the dominant phase in most of the samples, the chemical speciation of Hg in FGD gypsum from different provinces was different and also varied within the samples …

01/09/2021. Building rubble with plaster. Source: BAM. Gypsum is widely used in the construction sector, and its worldwide consumption has been increasing for several decades. This is mainly due to its excellent building material properties: gypsum can be used in a variety of ways in new constructions and also in the building refurbishment.

Materials and chemicals. The raw PG material used in this study was obtained from Sinochem Fuling Chemical Industry Co, Ltd. (Chongqing, China). After this, PG was dried at 40 °C for 12 h to ...

China: BNBM's operating income fell by 6% year-on-year to US$2.90bn in 2022 from US$3.07bn in 2021. Its net profit dropped by 11% to US$457m from US$511m. Parent company China New Building Material (CNBM) reported that its sales volumes of gypsum wallboard declined by 12% to 2.09Bnm 2 from 2.38Bnm 2.It noted that, despite …

Exports In 2018, Pakistan exported $381k in Gypsum, making it the 72nd largest exporter of Gypsum in the world. At the same year, Gypsum was the 608th most exported product in Pakistan. The main destination of Gypsum exports from Pakistan are: China ($291k), South Korea ($31.4k), Chinese Taipei ($28.5k), Sri Lanka ($12.2k), and Bangladesh …

Heavy metal-containing gypsum is a widespread hazardous waste. In this work, H + was found to be the most essential factor of the mineralizers in hydrothermal treatment to completely (≥99.8%) extract Cr(VI) from gypsum waste to the supernatant, where the significant growth (from several μm to several hundreds of μm) and perfection …

Heavy metal-containing gypsum is a widespread hazardous waste. In this work, H + was found to be the most essential factor of the mineralizers in hydrothermal treatment to completely (≥99.8%) extract Cr(VI) from gypsum waste to the supernatant, where the significant growth (from several μm to several hundreds of μm) and perfection …

In the above two medicines, there is one kind of mineral medicine–gypsum. The history of Chinese medicine in China is long and profound. Chinese medicinal materials are divided into three categories according to raw materials: Plants, minerals and animals. Mineral medicine has been used to treat diseases for more than 2000 years.

Rare earth-bearing gypsum tailings from the fertilizer industry are a potential source for an economically viable and sustainable production of rare earth elements. Large quantities are generated inter alia in Catalão, Brazil, as a by-product in a fertilizer production plant. Hitherto, the gypsum has been used as soil conditioner in agriculture or was dumped. …

The FGD gypsum of Shanxi province of China contained 77.4% of Mn, 25% of total Pb, and 51.8% of Zn as easily-soluble forms showing higher mobility 21. …

Effects of applying flue gas desulfurization gypsum and humic acid on soil physicochemical properties and rapeseed yield of a saline-sodic cropland in the eastern coastal area of China J. Soils Sediments, 16 ( 2016 ), pp. 38 - …

A novel process that includes selective reduction roasting followed by hydrolysis was proposed in this work to recover zinc, and efficiently extract calcium and sulfur from hazardous zinc-rich gypsum residue (ZGR) waste for high-purity of CaCO 3 and sulfur production. The selective reduction behaviors of ZGR during the reduction roasting …

The results reveal that calcium sulfoaluminate–belite cement can be produced by burning a raw mixture contains in weight percent (25% kaolin, 20% gypsum and 55% marble sludge waste) at firing ...

Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers.This article reviews the production in China and the latest beneficial utilizations of FGD gypsum. China is a large coal-consuming country and has always had serious SO 2 emissions. Therefore, the …

Phosphogypsum, as a byproduct of wet-process phosphoric acid reaction, has caused many environmental pollution problems. To improve the property and purity of phosphogypsum in the wet-process phosphoric acid process, a liquid–solid–liquid three-phase acid hydrolysis synergistic extraction reaction system was established by adding …

A maximum lithium extraction of approximately 84% was obtained using gypsum at 1050°C. Sodium sulphate produced a superior lithium extraction of up to 97% at 850°C. In all cases iron extraction ...

China has the worlds largest proven gypsum (CaSO4.2H(2)O) resources in the world. The gypsum ranges from pre-Cambrian to Quaternary in age and occurs in varied geological …

Enhanced extraction of heavy metals from gypsum-based hazardous waste by nanoscale sulfuric acid film at ambient conditions J Hazard Mater. ... Beijing 101408, PR China; National Engineering Laboratory for VOCs Pollution Control Materials & Technology, University of Chinese Academy of Sciences, Beijing 101408, PR China; Binzhou Institute ...

During Jul-Mar FY21, its contribution to GDP remained at 2.38% (Economic Survey FY21). While Pakistan's mineral exports are only about 0.1 % of the world's total exports. In year 2020, Pakistan's total mineral and metals exports were around $ 1.18 Bn as compared to the world's $ 1,490 Bn (UN Comtrade).

Recently, a study of stable isotope patterns of coexisting pyrite and gypsum at another methane seep site in the northern South China Sea also linked the formation of authigenic gypsum to the oxidation of pyrite and an associated increase in porewater sulfate and acidity (Z.Y. Lin et al., 2016).

gypsum was 18.0 million tons. Synthetic gypsum is mainly produced as a byproduct in flue gas desulfurization (FGD) systems. Calcined gypsum is produced domestically from crude gypsum by heating selenite. In the United States, gypsum is primarily used to manufacture wallboard and plaster for homes, offices, and commercial buildings.

The effective and safe use of FGD gypsum in agricultural land is still debated in some countries even though its effectiveness in soil management has been reported in many studies. Thus, the changes in the levels of soil salinity, alkalinity, crop yield, and other physicochemical properties in different soil types and crops after …

Ephedra-Gypsum extract and asprin were administered orally 6 h after the injection of yeast solution and body temperature was measured every 1 h for 8 h. ... China). Plant Material and Ephedra ...

Through controlling the phase transformation and chromium species under hydrothermal condition, the Cr(VI) was extracted fully from hazardous Cr(VI)-containing gypsum sludge, with a very high efficiency of more than 99.5%. Scanning transmission electron microscopy, X-ray absorption fine structure, and density functional theory …

Published: 13 March 2023. Preparation of gypsum with high purity and whiteness from phosphogypsum for CO 2 mineral sequestration. Man Zhang & Xing Fan. Scientific …

The pristine gypsum was yellow (Fig. 1 a) with a moisture content of 25%, and the pH of it was 8.The XRD patterns indicated that CaSO 4 ·2H 2 O, CaSO 4 ·0·5H 2 O, NaClO 3 and NaCl were the major crystal phases of the pristine gypsum (Fig. 1 c). SEM images (Fig. 1 b) showed that the particles were rod-like and block-shaped with the sizes …

The life cycle of gypsum plasterboard typically begins with the extraction and processing of raw materials, continues with the manufacture and use of the plasterboard, and then reaches end-of-life (EoL) that involves either landfilling, recycling or other forms of recovery (Fig. 1).These life cycle processes are described in the following Sections 2.1–2.4.

The total average Hg emitted due to FGD gypsum resource utilization in China in 2017 was estimated to be 11.42 tons (ranging between 2.15 and 38.35 tons), which accounted for about 23.8 % (ranging ...

Extraction in 10% NaCl, 50% H 2 SO 4 with pre-concentration using a C18 column: 45: 40: Signal to noise ratio of 3:1 (Almeida et al., 2016; Eiden et al., 1997) ... China. It was stated that Hg was introduced to the study area via contaminated irrigation water, with Hg bound to particulate matter. For natural unfarmed soils, positive ...