Deterioration Reason and Improvement Measure of the Retarding Effect of Protein Retarder on Phosphorus Building Gypsum

Abstract

The retarding effect of protein retarder on phosphorus building gypsum (PBG) and desulfurization building gypsum (DBG) was investigated, and the results show that protein retarder for DBG can effectively prolong the setting time and displays a better retarding effect, but for PBG shows a poor retarding effect. Furthermore, the deterioration reason of the retarding effect of protein retarder on PBG was investigated by measuring the pH value and the retarder concentration of the liquid phase from vacuum filtration of PBG slurry at different hydration time, and the measure to improve the retarding effect of protein retarding on PBG was suggested. The pH value of PBG slurry (<5.0) is lower than that of DBG slurry (7.8–8.5). After hydration for 5 min, the concentration of retarder in liquid phase of DBG slurry gradually decreases, but in liquid phase of PBG slurry continually increases, which results in the worse retarding effect of protein retarder on PBG. The liquid phase pH value of PBG slurry can be adjusted higher by sodium silicate, which is beneficial to improvement in the retarding effect of the retarder. By adding 1.0% of sodium silicate, the initial setting time of PBG was efficiently prolonged from 17 to 210 min, but little effect on the absolute dry flexural strength was observed.

Keywords

protein retarder / phosphorus building gypsum / deterioration reason / improvement measure

References

[1] Wu S, Yao YG, Yao XL, et al. Co-preparation of Calcium Sulfoaluminate Cement and Sulfuric Acid Through Mass Utilization of Industrial By-product Gypsum[J]. Journal of Cleaner Production, 2020, 265: 121-801.

[2] Guan QJ, Sui Y, Zhang F, et al. Preparation of α-Calcium Sulfate Hemihydrate from Industrial By-product Gypsum: A Review[J]. Physicochemical Problems of Mineral Processing, 2021, 57(1): 168-181.

[3] Rashad AM. Potential Use of Phosphogypsum in Alkali-activated Fly Ash Under the Effects of Elevated Temperatures and Thermal shock cycles[J]. Journal of Cleaner Production, 2015, 87: 717-725.

[4] Koukouzas N, Vasilatos C. Mineralogical and Chemical Properties of FGD Gypsum from Florina, Greece[J]. Journal of Chemical Technology and Biotechnology, 2008, 83: 20-26.

[5] Geraldo RH, Pinheiro SMM, Silva JS, et al. Gypsum Plaster Waste Recycling: a Potential Environmental and Industrial Solution[J]. Journal of Cleaner Production, 2017, 164: 288-300.

[6] Powell DA. Transformation of the α- and β-Forms of Calcium Sulphate Hemihydrate to Insoluble Anhydrite[J]. Nature, 1958, 182: 792.

[7] Badens E, Veesler S, Boistelle R. Crystallization of Gypsum from Hemihydrate in Presence of Additives[J]. Journal of Crystal Growth, 1999, 198–199: 704-709.

[8] Li ZX, Peng JH, Qiu XX. Effect of Different Ways of STPP Retarder Addition on Properties of Recycled Gypsum[J]. Journal of Wuhan University of Technology - Materials Science Edition, 2017, 32(5): 1125-1131.

[9] Zhang YY, Yang JS, Cao XY. Effects of Several Retarders on Setting Time and Strength of Building Gypsum[J]. Construction and Building Materials, 2020, 240: 117-927.

[10] Singh NB, Pandey S. Effect of Citric Acid on the Hydration of Plaster of Paris[J]. Gypsum and Lime, 1990, (224): 21–25

[11] Singh M, Garg M. Retarding Action of Various Chemicals on Setting and Hardening Characteristics of Gypsum Plaster at Different pH[J]. Cement and Concrete Research, 1997, 27(6): 947-950.

[12] Zhi ZZ, Huang J, Guo YF, et al. Effect of Chemical Admixtures on Setting Time, Fluidity and Mechanical Properties of Phosphorus Gypsum Based Self-leveling Mortar[J]. KSCE Journal of Civil Engineering, 2017, 21: 1836-1843.

[13] Czaderna A, Kocemba A, Kozanecki M, et al. The Influence of Cellulose Derivatives on Water Structure in Gypsum[J]. Construction and Building Materials, 2018, 160: 628-638.

[14] Peng JH, Zhang JX, Chen MF, et al. Influence of Macromolecule-Type Retarders on the Hydration Process of Building Gypsum and its Retarding Mechanism[J]. Journal of the Chinese Ceramic Society, 2008, 36(7): 896-900.

[15] Ding Y, Fang YC, Fang H, et al. Study on the Retarding Mechanism and Strength Loss of Gypsum from Hydrolyzed Wheat Protein Retarder[J]. Journal of the Korean Ceramic Society, 2015, 52(1): 28-32.

[16] Ding XL, Wei BQ, Dai R, et al. Effect of Collagen Hydrolysate Obtained from Leather Waste on the Setting, Hydration and Crystallization Process of Gypsum[J]. Journal of Industrial and Engineering Chemistry, 2022, 110: 158-167.

[17] Ding XL, Wei BQ, Deng MG, et al. Effect of Protein Peptides with Different Molecular Weights on the Setting and Hydration Process of Gypsum[J]. Construction and Building Materials, 2022, 318: 126185.

[18] Ding XL, Shan ZG, Long ZZ, et al. Utilization of Collagen Protein Extracted from Chrome Leather Scraps as a Set Retarders in Gypsum[J]. Construction and Building Materials, 2020, 237: 117-584.

[19] Ren XQ, Liu HJ, Liang XS. Study on Gypsum Retarder from Waste Penicillin Mycelium[J]. Advanced Materials Research, 2014, 878: 539-544.

[20] Kuntze RA. Synthetic Plaster Set Retarder[P]. US: US3304189A, 1967

[21] Chen XM, Gao JM, Liu CB, et al. Effect of Neutralization on the Setting and Hardening Characters of Hemihydrate Phosphogypsum Plaster[J]. Construction and Building Materials, 2018, 190: 53-64.

[22] Huang T, Peng XQ, Wang SP, et al. Adaptability of Protein Retarders for Calcined Gypsum[J]. Journal of Building Materials, 2018, 21(4): 608-613.

[23] Rosenberg YO, Reznik IJ, Zmora-Nahum S, et al. The Effect of pH on the Formation of a Gypsum Scale in the Presence of a Phosphonate Antiscalant[J]. Desalination, 2012, 284: 207-220.

[24] Zhang WJ, Li SC, Wei JC, et al. Grouting Rock Fractures with Cement and Sodium Silicate Grout[J]. Carbonates and Evaporites, 2018, 33: 211-222.