Effect of modifiers on crystalizing habit and mechanical strength of α-hemihydrate gypsum prepared from PG by an autoclaved method

Selective flotation separation of gypsum and quartz using dodecyl amine hydrochloride as collector: Mechanism and application

“…In addition, the peak of SO 4 2− was enhanced and the peak of O‐H was weakened obviously. Figure 8e shows the fitted results of S 2p on the untreated gypsum, and S 2p could be fitted as a doublet, and the binding energy of S 2p 3/2 was 168.78 eV, which corresponds to SO 4 2− in gypsum 41,42 . Both two S 2p peaks shifted hard after treatment with DH (Figure 10f) which demonstrated that there was no new electronic effect between the S element and other elements.…”

“…Figure 8e shows the fitted results of S 2p on the untreated gypsum, and S 2p could be fitted as a doublet, and the binding energy of S 2p 3/2 was 168.78 eV, which corresponds to SO 4 2À in gypsum. 41,42 Both two S 2p peaks shifted hard after treatment with DH (Figure 10f) which demonstrated that there was no new electronic effect between the S element and other elements. The changes indicated that O1s were involved in the adsorption of DH on the gypsum surfaces.…”

Zeolite Mineral Importance for Soil and Agricultural engineering – A Review

“…The addition of Clinoptilolite to the soil also increases the proportion of nitrogen, phosphorus, and potassium due to its ability in ion exchange processes. The addition of raw zeolite helps to improve soil moisture, prevent salinization, and increase the percentage of water in this soil, which helps in stabilizing crop growth as well as increasing the percentage of agricultural crop production, as many studies have shown [26]5- [32]. One of the benefits of using zeolite for soil is that it helps to improve the physical, chemical, and microbial properties.…”

Simultaneous effect of Na2EDTA on the phase transformation and morphology evolution during the transformation of gypsum into α-calcium sulfate hemihydrate

“…[2][3][4] As for the utilization of a-HH, in general, the larger the particle size and the higher the crystallinity, the better the performance of a-HH. [5][6][7] It is reported that the short columnar a-HH is an ideal crystal with high mechanical strength and good performance, [8][9][10][11] and additives are usually applied to modulate the crystal morphology of a-HH. In order to obtain short columnar a-HH, some special additives, such as citric acid, ethylenediamine tetracetic acid (EDTA), malic acid and aluminum chloride are used.…”