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 …
Mineral Processing. Gypsum processing can be divided into three basic steps: (1) rock preparation, (2) calcining, and (3) formulating and manufacturing. This is illustrated graphically with the flow chart in Figure 1. The specifics of each step will vary with the quality of the gypsum and with the type of final product.
The shortcomings of common equipment for utilization of phosphogypsum when processing it into semi-aqueous gypsum have been analyzed. Specific energy consumption per ton of produced construction ...
The synthesis of α-calcium sulfate hemihydrate (α-CSH) from flue gas desulfurization (FGD) gypsum is a good way to realize the comprehensive utilization of FGD gypsum. To obtain α-CSH with the satisfactory performances, a facile hydrothermal-aging pretreatment process for FGD gypsum raw materials was proposed, where FGD …
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 ...
This chapter reviews the complex market of gypsum-based products. It begins with definitions, according to ASTM, EN, and ISO standards, of the most …
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.
In the building materials, the industrial byproduct gypsum is mainly used in the production of cement retarders, gypsum slats, gypsum bricks, gypsum blocks, etc. …
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 ...
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.
Firstly the basic characteristics of Flue-gas-desulfurization gypsum (FGD gypsum) is described in this paper. Then the research status of FGD gypsum is …
According to the U.S. Energy Information Administration's statistics, in the 2006–2016 period, approximately 42% of the electricity consumed in the U.S.A was produced by coal combustion (U.S. Energy Information Administration, 2018).The coal combustion process generates various types of residues such as fly ash, bottom ash, …
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.
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 …
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 …
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 …
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 ...
This study provides an overview of calcium rich industrial wastes usage in construction materials, their properties and different applications through marble waste and flue gas desulfurization (FGD) gypsum. Large quantities of industrial wastes are stockpiled and haphazardly disposed in increasing amounts causing serious environmental …
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 …
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 …
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 …
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 …
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 ...
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 …
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
Clean treatment of PG is the basis of resource utilization, finding efficient and cost-effective PG cleaning process, especially the synergistic treatment of multiple …
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 ...
The utilization of gypsum reinforced composites as building materials has garnered considerable attention owing to their exceptional amalgamation of mechanical strength, fire resistance, and versatile applications. This review initiates by introducing gypsum as a pivotal mineral in construction, subsequently exploring the concept of …