Moreover, Ca 2+ in gypsum can react with silicate to form additional C–Si–H or react with aluminum silicate to improve the compressive strength of the paste matrix. XuQuan Huang invented a cementitious material for tailing fillings. In this process, phosphogypsum, red mud, phosphorous slag, and clinker are separately ground.
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PG's main content is dihydrate gypsum (CaSO 4 ·2H 2 O), and the crystal morphology is mainly irregular, flaky, columnar, and rhombic. PG has six mineral phases based on hydration degree, which are CaSO 4 ·2H 2 O, α/β-CaSO 4 ·0.5H 2 O, and Ⅰ/Ⅱ/Ⅲ-CaSO 4 [21]. Fig. 3 shows the thermal dehydration process of PG. Download: …
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Gypsum is a naturally occurring mineral that has been used by humans for various purposes for thousands of years. It is a versatile mineral with a wide range of applications in construction, agriculture, industry, and even art. ... Formation Process: The formation of gypsum involves a sequence of geological and environmental processes ...
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Carbon capture, utilization, and storage (CCUS) technologies are being developed to address the increasing CO2 emissions, mitigating the global warming and climate change. In this context, chemical precipitation has been advanced to enhance the performance, energy-efficiency and profitability of CCUS. In this review, we first present …
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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 …
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Iron from Acidic Wastewater and Red Gypsum Utilization Jinrong Ju1,2,3 · Yali Feng 1 · Haoran Li2,3 · Ben Wang1,2,3 Received: 16 February 2022 / Accepted: 12 April 2022 ... water and red gypsum can be realized. The process we proposed not only recovered valuable metals from acidic wastewater but also treated the red gypsum that had been
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However, the product of FGD, gypsum, causes the unexpected environmental problems. How to utilize the byproduct of FGD effectively and economically is a challenging task. This paper proposed the new technical process to produce SO 2 and CaO by reducing the gypsum in multi-stage fluidized bed reactor with different …
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To improve the utilization of IBP gypsum, Shen et al. attempted to use its partial decomposition to provide all of the CaSO 4 and a portion of the CaO required for CSA cement production ... the temperature region in which the crystalline transformation occurs is considered the most important in the entire process of gypsum …
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This paper proposed the new technical process to produce SO 2 and CaO by reducing the gypsum in multi-stage fluidized bed reactor with different atmosphere. In …
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Clean treatment of PG is the basis of resource utilization, finding efficient and cost-effective PG cleaning process, especially the synergistic treatment of multiple …
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11.16 Gypsum Manufacturing 11.16.1 Process Description1-2 Gypsum is calcium sulfate dihydrate (CaSO4 2H2O), a white or gray naturally occurring mineral. Raw gypsum ore is processed into a variety of products such as a portland cement additive, soil conditioner, industrial and building plasters, and gypsum wallboard. To produce plasters or
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Hitherto the preparation methods of α-HH from industrial by-product gypsum mainly include the autoclave process, salt/acid solution process, or alcohol-water solution process. ... Fig. 4 Proportion of various utilization ways of FGD gypsum produced in Europe (EU 15) in 2016, source-ECOBA . 171 Physicochem. Probl. Miner. Process., 57(1), 2021 ...
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In order to achieve low-cost and high-benefit resource utilization of red gypsum, a method of metal self-enrichment during the cycle and transformation of red gypsum was proposed. ... 4.75% Ca) could be obtained, which can be used as the proportioning of metallurgical sinter. The self-enrichment process not only realizes the …
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The massive accumulation of red gypsum has brought great harm to human and environment. In order to achieve low-cost and high-benefit resource utilization of red gypsum, a method of metal self-enrichment during the cycle and transformation of red gypsum was proposed. The carbon dioxide and ammonia water react with red gypsum …
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Request PDF | Red gypsum utilization and acidic wastewater treatment based on metal self-enrichment process | The massive accumulation of red gypsum has brought great harm to human and environment.
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The conventional process of the industrial utilization of the calcium sulfate whisker pretreatment process leads to a low utilization rate of FGD gypsum, further increasing the consumption of ...
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03-143-247Final. A characterization of the engineering properties of lime sludges derived from doublelime treatment of phosphogypsum stack system process waters is presented along with an evaluation of lime treatment sludge production quantities and CaO utilization (i.e., lime requirements) as a function of chemical characteristics of the process waters.
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Gypsum recycling constitutes a process whereby gypsum waste originating from construction sites is transformed into recycled gypsum, serving as a substitute for gypsum raw materials in manufacturing processes. ... can play a pivotal role in stimulating gypsum waste recycling efforts by providing incentives and promoting …
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When gypsum is heated at about 150–160 °C, it loses approximately three-quarters of its water in a partial dehydration process and becomes hemihydrate gypsum (CaSO 4 •½H 2 O) or calcined gypsum; it is also known as beta gypsum (alpha gypsum is made by processing batches of gypsum under elevated pressure). Calcined gypsum …
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To effectively solve the problem of recovery and utilization of flue gas desulfurized gypsum (FGDG), a new method for preparing SO2 gas by adding a mixture of FGDG and pyrite into a boiling ...
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Desulfurization gypsum (DG) is the byproduct of the limestone–gypsum flue gas desulfurization process in coal-fired power plants [] . In China, the annual production ... utilization focus varies based on the unique conditions present in each country [] . For instance, the predominant utilization of PG involves storage and processing, with a ...
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To effectively solve the problem of recovery and utilization of flue gas desulfurized gypsum (FGDG), a new method for preparing SO2 gas by adding a mixture of FGDG and pyrite into a boiling furnace and utilizing its high-temperature waste heat is proposed. Using the FactSage 6.1 Reaction module and the Equilib module, the …
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Background Gypsum is a valuable resource for farmers, supplying essential calcium and sulfur for plant growth. It serves as a crucial soil amendment, particularly in reclaiming alkali and sodic soils. While not a material, gypsum is widely …
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Desulfurization gypsum (DG) is the byproduct of the limestone–gypsum flue gas desulfurization process in coal-fired power plants . In China, the annual production of DG can reach up to 80 million tons, and the utilization rate has been around 80% in recent years. ... which greatly enhances the resource utilization of titanium gypsum ...
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The high-active sorbent for SO2 removal was developed by mixing CaO particles with fly ash in water at ambient temperature. The calcium utilization rate in the sorbent was achieved to 60% after the desulfurization reaction at 450 °C for 90 min, while the utilization rate for original pure CaO particles was only 21% under the identical …
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Basic characteristics and comprehensive utilization of FGD gypsum. Zhang Yichao 1, Wang Ying 1, Zhou Jinghai 1, Liu Jiaxi 1 and Li Tong 1. Published under licence by IOP Publishing Ltd IOP Conference Series: Earth and Environmental Science, Volume 510, 4. Civil Engineering and Construction Engineering Citation Zhang Yichao et al 2020 …
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The acidic wastewater and red gypsum generated by the titanium dioxide (TiO 2) industry pose a great threat to humans and the environment.In order to achieve low-cost and high-benefit resource utilization of acidic wastewater and red gypsum, a harmless process for the self-treatment of acidic wastewater and red gypsum as well …
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As phosphogypsum constitutes a large amount of solid waste material, its purification treatment and comprehensive utilization have close connection with economic development and ecological environmental protection. For the moment, the storage quantity of phosphogypsum is still rising as a result of the increasing phosphate fertilizer …
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This article reviews the properties, production, and applications of flue gas desulfurized gypsum (FGD gypsum) in China, a by-product of coal combustion. It also …
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