PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 9, Number 3 2023
calcium carbonate, clay (or kaolin), titanium dioxide and talc (hydrated magnesium silicate). In addition, calcium carbonate can also be used to increase the paper opacity. A fine powder was obtained and the calcium carbonate composition determined for both the unbleached and bleached one. The eggshell powder was analyzed using XRD and results compared with PCC results. The calcium carbonate was found to be 85% and 92.5% for the unbleached and bleached powder respectively. The chicken eggshell powder was found to have magnesium calcite structure. The observed results all aligned the eggshell powder for use as a filler in the paper industry. Preparation of in-situ modified diatomite and its application in papermaking, Zhitian Fan, Zheng Li, Wei Qi, Shuting Zhao, Bing Zhou, Songyan Liu & Yumei Tian, Colloids and Surfaces A: Physicochemical and Engineering Aspects , Vol. 657, Part A, 130582 (20 Jan. 2023). In the paper industry, adding fillers can replace plant fibers in pulp, which is beneficial to environmental protection and cost reduction. However, the large-scale use of inorganic fillers can interfere with interfiber bonding, thereby affecting the physical properties of paper. Due to the loss of fillers and paper fibers, the pollution of paper machine white water is aggravated. In order to improve the above situation, diatomite was used as the matrix and modified by Al(OH) 3 in-situ precipitation. In this study, modified diatomite was used as a papermaking filler. Paper properties, retention and the chemical oxygen demand in papermaking wastewater were also evaluated. The results show that, compared with the blank control, the modified diatomite filler could effectively improve the retention rate and reduce the pollution of paper machine white water while maintaining the physical strength of the paper. Among them, the fiber retention rate of pulp raw material could reach 98.05% and the chemical oxygen demand content of paper machine white water was 30.10 mg L −1 . Preparation of Flexible Calcium Carbonate by In Situ Carbonation of the Chitin Fibrils and Its Use for Producing High Loaded Paper, Sang Yun Kim, Sun Young Jung, Yung Bum Seo & Jung Soo Han, Materials 16(8), 2978 ( 2023 ). Flexible calcium carbonate (FCC) was developed as a functional papermaking filler for high loaded paper, which was a fiber-like shaped calcium carbonate produced from the in situ carbonation process on the cellulose micro-or nanofibril surface. Chitin is the second most abundant renewable material after cellulose. In this study, a chitin microfibril was utilized as the fibril core for making the FCC. Cellulose fibrils for the preparation of FCC were obtained by fibrillation of the TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) treated wood fibers. The chitin fibril was obtained from the β -chitin from the born of squid fibrillated in water by grinding. Both fibrils were mixed with calcium oxide and underwent a carbonation process by the addition of carbon dioxide, thus the calcium carbonate attached on the fibrils to make FCC. When used in papermaking, both the FCC from chitin and cellulose gave a much higher bulk and tensile strength simultaneously than the conventional papermaking filler of ground calcium carbonate, while maintaining the other essential properties of paper. The FCC from chitin caused an even higher bulk and higher tensile strength than those of the FCC from cellulose in paper materials. Furthermore, the simple preparation method of the chitin FCC in comparison with the cellulose FCC may enable a reduction in the use of wood fibers, process energy, and the production cost of paper materials. Synthesis and characterization of PCC from marble waste for its application in papermaking, Vinod Kumar Dhakad, Prashant Shrivastava, Saakshy Agarwal & Susanta Kumar Jana, preprint not in a peer-reviewed journal, https://doi.org/10.21203/rs.3.rs-3220760/v1. CaCl 2 solution and Ca(OH) 2 slurry, both prepared from marble waste (MARWAS), were carbonated with CO 2 gas in the presence
Technical Abstracts
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