Siderite precipitation using by-product red gypsum for CO2
The neutralization of the spent H 2 SO 4 during TiO 2 extraction with limestone and lime results in by-product red gypsum (Eqs. (1) and (2)). Afterwards, the red gypsum is filtered and separated from water, with the water then being recycled in the process.
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A novel neutralization process for improving dehydration …
Download Citation | On Nov 1, 2024, Yan Li and others published A novel neutralization process for improving dehydration performance of industrial by-product gypsum | Find, read and cite all the ...
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Progress in the Preparation of Calcium Carbonate by Indirect
To avoid the long-term pollution of land and water by industrial gypsum by-products, the exploitation of this resource has become a priority. The indirect synthesis of calcium carbonate from the ...
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Facile preparation of α-calcium sulfate hemihydrate whisker from …
Gypsum, an important mineral resource, is widely used in the chemical industry [1], agriculture [2], medical treatment [3], building materials [4], food [5], and other fields, which mainly come from natural and industrial by-products.In the field of chemical industry, gypsum is commonly used as a raw material for the production of sulfuric acid, ammonium sulfate, …
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CN103288370A
The invention provides a process for producing high-strength alpha-gypsum from chemical gypsum by adopting a dry method. The process comprises the following specific steps of: placing a chemical gypsum as a raw material in a mixing machine, and spraying a mixed aqueous solution of a crystal modifier of sulfonate and maleic anhydride on the surface of the chemical …
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Gypsum Byproduct Processing Solutions
Gypsum produced from flue-gas desulfurization (FGD) has been used as a valuable byproduct that was sold as a feedstock for wallboard manufacturing. Economic trends in housing starts affect the demand and price of gypsum.
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PRODUCTION OF SULFUR FROM GYPSUM AS AN …
) was to investigate and improve a biotechnological process that could economically cope with the disposal of industrial gypsum and its relatively expensive chemical reduction which requires a great deal of energy (reaction of gypsum with coal at …
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Flue gases: Gypsum dewatering in desulphurisation
The process stage of gypsum dewatering is a well established part of the wet limestone-based flue gas desulphurisation process. In the upstream area, which comprises fly ash removal, limestone grinding and scrubber, it is …
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Formation of α-Hemihydrate Inside of a Gypsum Crystal during …
Therefore, the dehydration process of gypsum and the rehydration of hemihydrate were investigated. This dehydration process is technically performed in three different ways.
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Recycling industrial byproduct gypsum for use as plastering …
Industrial by-product gypsum is a highly productive solid waste consisting mainly of calcium sulfate dihydrate ... from the phosphoric acid process) and ue gas desul-furization gypsum (FGDG, from the ue gas desulfurization process) [1, 3, 4]. Despite the steadily growing demand for gypsum, IBG is still an underutilized solid waste mostly due to ...
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A novel neutralization process for improving
DOI: 10.1016/j.cep.2024.110070 Corpus ID: 274006147; A novel neutralization process for improving dehydration performance of industrial by-product gypsum @article{Li2024ANN, title={A novel neutralization process for improving dehydration performance of industrial by-product gypsum}, author={Yan Li and Bin-chuan Li and Xiaoge Wang and Jianshe Chen and Daxue …
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Effect of Industrial Byproduct Gypsum on the Mechanical …
Dehydrated DG will reform gypsum crystals during the hydration process. The relevant reaction equations are as follows: ... (OH) 12 ·26H 2 O) is a primary hydration product in gypsum-based cementitious materials. It not only enhances the mechanical properties of the matrix but also has the ability to immobilize oxyanions and heavy metal cations .
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Recent advances in flue gas desulfurization gypsum processes …
Flue gas desulfurization gypsum (FGDG) is an industrial by-product generated during the flue gas desulfurization process in coal-fired power plants. ... "atmospheric acid solution" to decolor gypsum by controlling the crystallization of the gypsum and the dissolution process. Calcium sulfate gypsum of 98% purity was obtained after three ...
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Calcite precipitation from by-product red gypsum in …
Moreover, the results confirmed that red gypsum has a considerable potential to form calcium carbonate (CaCO 3) during the CO 2 mineral carbonation process. Furthermore, the low cost and small amount of energy required in the use of …
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A comprehensive review of flue gas desulphurized gypsum: …
The scrubbing process is widely used to free flue gas from sulfur dioxide, and FGD gypsum is a by-product that originated in due process [6]. 'Wet-type scrubbing' and 'dry or semi-dry scrubbing' methods are generally employed for desulfurizing flue gas.
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Preparation of α-calcium sulfate hemihydrate from industrial by-product
In recent years, the massive accumulation of industrial by-product gypsum, especially flue gas desulfurization (FGD) gypsum and phosphogypsum (PG), not only encroaches on lands but also causes serious environmental pollution. ... Hitherto the preparation methods of α-HH from industrial by-product gypsum mainly include the autoclave process ...
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Recycling, reusing and environmental safety of industrial by-product
With the rapid advancement of industrial production, the substantial accumulation of industrial by-product gypsum containing high salinity, acidity/alkalinity, and heavy metals are currently causing widespread ecological damage on a global scale. Based on the different industrial production processes, industrial by-product gypsum can be divided into various types.
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Evaluation of engineering properties and environmental effect of
The discard and landfill of by-product gypsum cause significant environmental problems. About 100–280 million tons of phosphogypsum and a large amount of waste plasterboard are produced every year in the world, but the utilization rate of phosphogypsum is about 10%. ... Harded gypsum after semi-hydration process is composed of interlocking ...
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Gypsum Products
Gypsum Products Contents 8.1 Introduction – 196 8.2 Denitions – 198 8.3 Raw Materials – 199 8.3.1 Natural Gypsum – 199 8.3.2 Synthetic Gypsum – 201 8.4 Calcined Gypsum Manufacturing Process – 203 8.5 Properties of Gypsum – 205 8.5.1 Fire Properties – 206 8.5.2 Acoustic Properties – 207 8.5.3 Thermal Properties – 208
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(PDF) The Generation Process, Impurity Removal and High …
The Generation Process, Impurity Removal and High-Value Utilization of Phosphogypsum Material. ... (industrial by-product gypsum) is. a typical representative of solid waste material.
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Application of the Industrial Byproduct Gypsum in Building …
In the building materials, the industrial byproduct gypsum is mainly used in the production of cement retarders, gypsum slats, gypsum bricks, gypsum blocks, etc. In recent years, new …
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Co-preparation of calcium sulfoaluminate cement and sulfuric acid
Industrial by-product gypsum is a waste by-product containing mostly calcium sulfate. Problems related to its storage and utilization have become a bottleneck restricting the development of various industries. ... The formation process of ye'elimite using gypsum decomposition was investigated by the thermal analysis of the ISY sample. Fig. 2 ...
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Recycling method of sulfate process titanium dioxide by-product
The invention discloses a recycling method of a sulfate process titanium dioxide by-product titanium gypsum and a wall material prepared from the titanium gypsum. The invention belongs to the field of resource recycling. The method comprises steps of dehydration treatment, calcining treatment, fine grinding treatment, compounding treatment, mixing treatment, natural curing …
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MgO-based supersulfated cement with different industrial by-product
The different types of gypsum, including flue gas desulfurization (FGD) gypsum, phosphogypsum, citric gypsum, and building gypsum, used in this study came from by-products of different Chinese industrial enterprises, and their detailed information of mineral phase, composition and particle size are shown in the Fig. 1, Fig. 2 and Table 1. The ...
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11.16 Gypsum Manufacturing
This study summarized industrial by-product gypsum into eight types (flue gas desulphurization gypsum (FGDG), phosphogypsum (PG), titanium gypsum (TG), salt gypsum …
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Recycling industrial byproduct gypsum for use as plastering
Industrial by-product gypsum is a highly productive solid waste consisting mainly of calcium sulfate dihydrate (CaSO 4 ·2H 2 O), which is generated in the production of phosphoric acid, flue gas desulfurization process, etc. [1, 2].In China alone, the annual output of IBG exceeds 200 million tons, predominantly in the form of phosphogypsum (PG, from the phosphoric acid …
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Recycling industrial byproduct gypsum for use as plastering
Industrial by-product gypsum is a highly productive solid waste consisting mainly of calcium sulfate dihydrate (CaSO 4 ·2H 2 O), which is generated in the production of …
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Activation mechanisms of three types of industrial by-product …
DG and DA were generated via flue gas desulphurisation. The production processes of DG and DA are presented in Fig. 1 (a) and (b). DG, which mainly comprises dihydrate gypsum, is widely applied in the construction industry as a cement-setting retarder [7], an activation agent for supplementary cementitious materials [8] and a material for producing …
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Preparation of alpha-calcium sulfate hemihydrate from FGD gypsum …
The rigid regulation of sulfur dioxide emission in China has triggered the intense and wide application of lime/lime stone wet flue gas desulfurization (FGD) project in coal power plants, which, as a result, generates large quantities of by-product FGD gypsum (70–80 million tons/year).The management and disposal of FGD gypsum have been a headache issue for …
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6 Facts about Synthetic Gypsum
Synthetic gypsum is created as a by-product of industrial processing. It is composed of calcium sulfate dihydrate, has the same characteristics as natural gypsum, and is a high-quality and environmentally friendly product. 2. Synthetic Gypsum Comes in Many Forms. Synthetic gypsum is the name used to classify a variety of gypsum by-products. The ...
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