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·DOI / Corpus ID 266829335; Preparation of α hemihydrate gypsum whiskers from phosphogypsum using atmospheric pressure nitrate solution article{Xia2024PreparationO title={Preparation of $alpha$ hemihydrate gypsum whiskers from phosphogypsum using atmospheric pressure nitrate solution} author={Baolin
·As a solid waste phosphogypsum has good potential for the preparation of building materials When the preparation pressure was 300 MPa and the placing time was 5d the compressive strength of the finished product was higher than 80 MPa and the flexural strength was MPa which can be regarded as a high strength construction material
The main methods of the preparation of gypsum based lightweight materials are described and com pared Gypsum can be lightened indirectly by the lightweight filler or directly
·At present the continuous accumulation of the flue gas desulfurization FGD gypsum in steel plants leads to the serious environmental issues and resource waste To achieve green and sustainable development for the steel industry it is significant to improve the usage of by product gypsum Employing the sintering FGD gypsum ferric oxide and graphite carbon
·A substantial stockpile of phosphogypsum PG not just consumes land resources but also poses environmental contamination risks Herein the conversion of PG into high value α hemihydrate gypsum α HH whisker by the atmospheric pressure salt solution method with simple process high efficiency and low energy consumption was investigated
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 α HH is an important cementitious material which can be prepared by hydrothermal method from calcium sulfate dihydrate DH in an electrolyte solution
·Phosphogypsum PG is a solid waste product generated during wet process phosphoric acid production Various impurities considerably reduce the purity whiteness and application range of PG This article analyzes the physical properties of PG in detail and systematically examines the content and distribution of impurities Based on the obtained
·At present certain pretreatment methods are required for making building gypsum through phosphogypsum such as chemical methods [9] water washing methods [10] flotation methods [11] sieve
·Phosphogypsum is an industrial byproduct from the wet preparation of phosphoric acid Phosphorus building gypsum can be obtained from phosphogypsum after high thermal dehydration This study aimed to analyze the influence of ball milling with different parameters on the strength of phosphorus building gypsum In this paper the absolute dry
The preparation of natural and synthetic gypsum prior to calcination such as drying and grinding Handling and Processing FGD Gypsum for Application in the Building Industry in Europe Production and Use of Industrial Calcium Sulfates and the Properties of Building Material Produced from Them ZKG Int ZKGIFW0722 4397 Vol 44
·Desulfurized building gypsum DBG has great application potential and can be used to produce lightweight plastering gypsum LPG In this work DBG was modified by adding different proportions of sawdust retarder and hydroxypropyl methylcellulose HPMC water retaining agent to prepare LPG When the sawdust content is greater than 9% and less than
·Phosphogypsum PG is a solid waste produced during chemical wet phosphoric acid production [1] The main ingredient in PG is calcium sulphate dihydrate which is a good reclaimed gypsum resource [2] According to statistics for each ton of phosphoric acid produced four five tons of PG are generated wet basis [3] Currently the global annual output of PG is
·The paper deals with the production of lightweight gypsum composites by means of a vegetal protein foaming agent Two manufacturing methods which basically differ in the physical state of the foaming agent used have been proposed and the relative experimental results have been compared and discussed The gypsum foam samples have been
·The industrial application of PG is mainly focused on building gypsum β CaSO 4 · 2 O [5] α hemihydrate gypsum α CaSO 4 · 2 O α HH [6] [7] cement retarder [8] sulfuric acid co production cement [9] soil conditioner [10] and so on Among which the preparation of α HH using PG is one of the most profitable approaches because α HH is a
·Calcium sulfate hemihydrate whiskers CSHW a multi functional and high value added building material were prepared with flue gas desulfurization FGD gypsum by hydrothermal method which could be a reasonable disposal of FGD gypsum In order to obtain CSHW of a high aspect ratio a series of manufacturing parameters such as reaction
·However chemical ball milling is a secondary method when chemical and water washing methods are used for phosphogypsum or building gypsum Li [ 18 ] studied the impact of ball milling time on the specific area/particle size distribution/water consumption of normal consistency/strength at 2h and strength at dry condition of building gypsum
·This paper studied effect of different pretreatment process on Yunnan phosphorus building gypsum strength and crystal morphology such as washing method lime neutralization method flotation method and Hans method A lots experiment result indicated that basic properties of phosphorus building gypsum of different pretreatment methods could
4 ·Gypsum plaster was used as early as 7000 BCE as a construction material in Egypt Gypsum was first discovered and utilized in North America in Nova Scotia Canada in 1770 Another method of extracting gypsum from quarries is the use of a surface miner This is an adaptation of highway resurfacing technology in which a horizontally rotating
·The main utilization method of FGD gypsum is still used in construction materials Ye et al 2019 As an auxiliary material or instead of natural gypsum it can be widely used in concrete walls concrete etc It is the best way to use desulfurized gypsum in large quantities but its economic value is relatively low Pedreno Rojas et al 2020
·DOI / Corpus ID 224895914; Unraveling a Sustainable Process for the Production of High Strength α Gypsum Using Soda Residues and H2SO4 article{Wang2020UnravelingAS title={Unraveling a Sustainable Process for the Production of High Strength $alpha$ Gypsum Using Soda Residues and H2SO4}
·The utilization of desulfurized building gypsum as raw material for gypsum based self leveling mortar GSL is limited by its low strength and poor water resistance The objective of this study is to enhance comprehensive properties of GSL and prepare qualified desulfurized building gypsum based self leveling mortar that can be effectively applied in
·Following the specifications stated in the Determination of Mechanical Properties of Building Gypsum GB/ 1999 part of the phosphorous building gypsum slurry was poured into a 40 × 40 × 160 mm triple die to test its compressive other part was poured into a 20 × 20 × 20 mm six joint cement paste die to test the paraffin
·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 regulation of crystal shape were studied in this paper in order to provide guidance for the low cost and high value utilization of phosphogypsum The results showed that H3PO4 can significantly
