Α Hemihydrate Gypsum Crusher Plant
Innovative synthesis of high-strength α-hemihydrate …
This study evaluated the feasibility to recycle TG to produce α-hemihydrate gypsum via microwave hydrothermal method, wherein tricarballylic acid (TA) was …
Insights into the Role of Na+ on the Transformation of …
Alcohol–water solution-mediated transformation of gypsum into α-hemihydrate (α-HH) whiskers provides a green alternative for the high-value-added recycling of flue gas …
Flowability prediction of recycled α-hemihydrate gypsum …
Flowability prediction of recycled α-hemihydrate gypsum for 3D powder under combined effects of different glidants using response surface methodology. ... In the powder sample preparation processes (Fig. 3 (a)–(c)), the WGP was ground using a crusher to achieve a particle size comparable to that of α-CHG, ...
The study on the effect of flotation purification on the performance …
Phosphogypsum (PG) is a massive industrial solid waste. In this paper, PG was purified by flotation method, and α-hemihydrate gypsum (α-HH) was prepared by the autoclaving method. The morphology ...
Production and resource utilization of flue gas desulfurized gypsum …
The main synthetic materials are α-hemihydrate gypsum dihydrate, calcium carbonate, adsorption materials and composite material (Table 4). The preparation of α-hemihydrate gypsum (α-HH) is an effective way to realize the high-value utilization of FGD gypsum. The formation mechanism and crystal structure of α-HH are shown in Fig. 4. …
New insights into the growth characteristics and
This analysis aimed to determine the phase composition of α-hemihydrate gypsum (α-HH) powder. The surface of the α-HH powder was examined using X-ray …
Formation of α-Hemihydrate Inside of a Gypsum Crystal …
This theory of the formation of α-hemihydrate inside of a gypsum crystal is experimentally proven in the present work. This work firstly shows that the observed crystallization inside of gypsum during dehydration is the formation of alpha-hemihydrate.
gypsum hemihydrate production plant | Mining & Quarry Plant
Then produces α-hemihydrate gypsum, the basis material to cast a special gypsum. alpha gypsum hemihydrate plant design – Crusher South Africa manfacturing equipment for alpha gypsum.
Effect of Soluble Phosphorus on the Mechanical …
Preparation of a-hemihydrate gypsum crystal is an approach for utilization of phosphogypsum (PG), but the soluble phosphorus impurities in PG have a crucial influence on the performance of a-hemihydrate gypsum.
Utilization of phosphogypsum to synthesize α-hemihydrate gypsum …
Phosphogypsum (PG) is a kind of industrial solid waste with high impurity content and low utilization rate. In this study, α-hemihydrate gypsum (α-HH) was synthesized from PG in H 3 PO 4 –H 2 O solution (wet-process phosphoric acid solution and phosphoric acid solution) under atmospheric pressure. The crystal morphology of α …
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Effect of Phosphoric Acid on the Preparation of α …
The effects of phosphoric acid (H3PO4) in pressurized aqueous solution on the dehydration of CaSO4·2H2O to form α-hemihydrate gypsum (α-HH) phase and the …
Autoclave‐Free Formation of α‐Hemihydrate Gypsum
Flue gas gypsum may be converted to α-hemihydrate by suspending the starting material in inorganic salt solutions of high concentration or in diluted sulfuric acid …
Preparation of α-hemihydrate gypsum from …
Preparation of α-hemihydrate gypsum (α-HH) from phosphogypsum (PG) by atmospheric hydrothermal method has a good application prospect due to the mild reaction conditions, the solution medium and ...
Effect of modifiers on crystalizing habit and mechanical strength of α
α-Hemihydrate gypsum (α-HH) was prepared by autoclaving phosphogypsum (PG) in the presence of potassium sodium tartrate, succinic acid, potassium sulfate and aluminum sulfate as modifiers. Through testing the crystal water content, XRD, XPS, SEM, and strength, and carrying out the molecular dynamic …
Crystallization kinetics of large-sized columnar α …
Direct production of high-strength α-calcium sulfate hemihydrate (α-HH) with no additives was accomplished by the reaction of aluminum sulfate and waste CaCl …
Crystallization Kinetics of α-Hemihydrate Gypsum Prepared …
At present, the most important high value-added utilization technology is the use of PG to produce hemihydrate gypsum (HH) cementing materials, mainly α-type …
Coordinated disposal of FGD gypsum and power plant
The effects of different morphologies of dihydrate gypsum on α-hemihydrate gypsum were discussed, which indicates that granularity and morphology of α-hemihydrate gypsum are directly related to ...
Preparation of α-calcium sulfate hemihydrate from …
causes serious environmental pollution. The preparation of α-calcium sulfate hemihydrate (α-HH) from industrial by-product gypsum is an important way to solve the massive accumulation. α-HH possessing larger, dense and well-grown crystals with fewer cracks and pores has high added value and a wide range of application.
Structural characteristic and formation mechanism of hemihydrate …
Calcium sulfate hemihydrate exists in three crystal forms: α-, β-, and γ-hemihydrates. Each form has a deference crystal structure, the α-, ... FGD gypsum was supplied by a power plant in the Henan Province, China, and was purified in accordant with a previously reported procedure (Wang et al., 2015).
Revealing maleic acid role in the preparation of α-hemihydrate gypsum …
The applications of gypsum in China are primarily twofold: the preparation of high-strength gypsum, construction gypsum, composite cementing materials, and others, and the preparation of gypsum building products like gypsum board and gypsum blocks. Among these, α-hemihydrate gypsum (α-HH) is a high-end gypsum product, mainly …
Preparation of α-High Strength Gypsum from Flue Gas …
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 …
Synthesis of α-hemihydrate gypsum from cleaner phosphogypsum
Cleaner phosphogypsum is prepared from phosphate rocks with "HCl H 2 SO 4 method".. α-hemihydrate gypsum is synthesised by mild method from cleaner phosphogypsum.
Alpha Gypsum: k-sentials
Moulding gypsums are products made of calcium sulphate hemihydrate with optional factory additives, where very pure brilliant raw gypsum is used in their manufacture. Physically different hemihydrates are produced depending on the calcination process used: Alpha hemihydrate in the autoclave, or beta hemihydrate in the boiler plant or in the ...
Calcium sulphate hemihydrate hydration leading to gypsum
When α-hemihydrate was added to water, calcium and sulphate ions go into the solution making the solution saturated or supersaturated with respect to dihydrate. After this gypsum nuclei of critical size are formed (induction period) and the crystallization starts with the hardening of the hemihydrate. ... crystals in the presence of tartaric ...
Unveiling the organic acids with auxiliary functional groups …
Regulating the crystal morphology of low aspect ratio, short columnar α-hemihydrate gypsum (α-HH) is crucial due to its distinctive physical and chemical properties, which make it widely applicable. In this work, succinic acid, malic acid, and maleic acid were selected as the research objects, among which the number and spacing of carboxyl ...
Effect of additives on the properties of α-hemihydrate
The effects of Na-succinate and succinic acid on the properties of the α-hemihydrate synthesised from the fluegas desulphurised (FGD) gypsum of the Mae …
Preparation of α-hemihydrate gypsum from
Semantic Scholar extracted view of "Preparation of α-hemihydrate gypsum from phosphogypsum in glycerol and Na2SO4 mixed solutions under atmospheric pressure" by Xian-bo Li et al.
Promotion of conversion activity of flue gas …
Promotion of conversion activity of flue gas desulfurization gypsum into α-hemihydrate gypsum by calcination-hydration treatment GUAN Qing-jun()1, 2, SUN Wei ... In this study, aiming at FGD gypsum from steel plants, we systematically explored its structure, chemical composition, particle size distribution, and surface characteristics ...
Coordinated disposal of FGD gypsum and power plant …
Semantic Scholar extracted view of "Coordinated disposal of FGD gypsum and power plant concentrated brine via preparation of α-hemihydrate gypsum" by Dongjie Pang et al.
A mild alcohol-salt route to synthesize α-hemihydrate gypsum …
A mild alcohol-salt route to synthesize α-hemihydrate gypsum microrods from flue gas desulfurization gypsum in large scale. Baojun Yang 1, Yinzhe Dong 1, Bai Nian Wang 2,1, ... Thus, it is urgent to dispose the FGD gypsum of the chemical and coal power plants. Utilization of FGD for hemihydrate gypsum ...
What equipment is needed for the granulation high-strength gypsum …
Gypsum stone raw material - granulation (water, crystal conversion agent) - autoclaved in saturated steam - crushing - drying - grinding - α type hemihydrate gypsum finished product As shown above, the granulation high-strength gypsum powder production line process includes granulation, autoclaving, crushing, drying, grinding, etc.
Innovative synthesis of high-strength α-hemihydrate gypsum…
High-strength gypsum is the recognized designation for α-hemihydrate gypsum, often referred to as α-HH (CaSO 4 ·0.5H 2 O), which is a cementitious material with low water requirement and high strength [8].