·Red gypsum RG is an industrial waste generated from the titanium dioxide process produced For the low cost and high benefit utilization of RG calcium sulfate CaS was prepared from recycled RG Rod like gypsum crystals with a rough surface uniform size 1 µm in diameter and 5 µm in length were obtained when the as prepared CaS was divided into three
·the recycled gypsum dihydrate had already been trans formed to the gypsum hemihydrate before the beginning of the density test Considering these heating test results it is known that
·The Japanese wallboard producer Chiyoda Ute Co Ltd and its partners have developed a patented gypsum recycling process that allows the production of wallboard with up to 100% recycled content bringing the prospect of true resource circularity to the global gypsum sector Above Table 1 Japanese gypsum dihydrate usage in 2020 000 of
·After drying and aging the ratio of hemihydrate and dihydrate gypsum in the modified phosphogypsum is reasonable which is beneficial to enhance the early strength of the recycled aggregate After drying the phosphogypsum will contain a certain amount of anhydrous gypsum and a small amount of dihydrate gypsum phases
Calcium phosphate is known as a major component of biological hard tissues This study aimed to produce calcium phosphate by recycling kneaded surplus gypsum β dihydrate gypsum was derived from commercial dental β hemihydrate gypsum which was mechanically powdered and mixed with the liquid component of a commercial zinc phosphate cement
·The main component of gypsum is calcium sulfate and gypsum can be classified as anhydrite CaSO 4 hemihydrate CaSO 4 • 2 O HH and dihydrate gypsum CaSO 4 •2H 2 O DH Claisse and Ganjian 2006 The HH gypsum is also called as bassanite When the temperature is about in the 0 65 °C range the H 2 O molecules in DH gypsum would be
·Hansen et al [14] [107] studied the effect of recycled gypsum content 0 20 % on the unconfined compressive strength of fly ash composite recycled gypsum from waste drywalls cementitious materials The study found that the 90 day compressive strength of concrete with 5 % gypsum content was the highest which was MPa
·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 high
The results suggest that production of synthetic β TCP is possible through ecological techniques using recycled materials and that some residual dihydrate gypsum remained in the sample Calcium phosphate is known as a major component of biological hard tissues This study aimed to produce calcium phosphate by recycling kneaded surplus gypsum β dihydrate gypsum was
·It is found that PMMA completely covers the matrix surface and well fills the interparticle pores of dihydrate gypsum crystals inside the matrix forming an interpenetrating and dense composite structure The proposed process has great potential to recycle waste PG and protect environment since PG is used as the main raw materials and only
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