The effect of additives on stirred media milling of limestone

Yatay Kariştirmali Bi̇lyali Deği̇rmen: Isamill

“…Bu kimyasal reaktifler tane yüzeylerine soğurularak tanelerin yüzey yüklerini (zeta potansiyellerini) arttırmakta ve viskozitesinin düşmesini sağlamaktadırlar. Bu reaktifler, özellikle yüksek katı konsantrasyonuna sahip pülpların akıcılığını arttırarak değirmenin yüksek kapasitede çalışmasına yardımcı olmaktadır [19,21]. Yapılan çalışmalarda polimerik kimyasalların inorganik kimyasallara göre öğütmede daha etkili olduğu görülmüştür.…”

Enhancement of energy efficiency for mechanical production of fine and ultra-fine particles in comminution

“…Relevant results have mostly been obtained for tumbling mills (EL-Shall & Somasundaran, 1984;Klimpel, 1982;Somasundaram & Shrotri, 1995). Since stirred bead mills have recently attracted much attention because of their high energy efficiency, ability for grinding into the micrometer and submicrometer range and lower product contamination (Tuunila, 1997;Zheng, Harris, & Somasundaram, 1997), the addition of appropriate chemical additives into the ground particulate material in stirred bead mills to improve grinding and energy efficiency has also been carried out. In their study , three organic polymers (sodium salt of an acrylic copolymer, sodium salt of a polycarboxylic acid and sodium salt of a polymer) and two inorganic chemicals (sodium hexametaphosphate and tetrasodiumpyrophosphate) were used as grinding aids for wet ultra-fine grinding of a dolomite material (<70 m) in a stirred bead mill.…”

“…5) and achieve a steeper size distribution of the product. Zheng et al (1997) studied the effect of additives on the wet grinding of limestone in a stirred bead mill, e.g., inorganic electrolytes (sodium hydroxide and sodium carbonate), a surfactant (sodium oleate/oleic acid) and a polymer (polyacrylic acid or PAA). Compared to grinding without additives, use of sodium carbonate and sodium oleate results in a decreased energy efficiency at high addition concentrations over the additive concentration range studied, while use of sodium hydroxide results in an increased efficiency only at the lower concentration of 0.008%, but a decreased efficiency at higher concentrations.…”

Scale Inhibitor and Dispersant Based on Poly(Acrylic Acid) Obtained by Redox‐Initiated Polymerization

“…Sodium polyacrylate (NaPA) is the most widely used dispersant for limestone, and molar masses between 2000 and 8000 g mol −1 have been observed to be the best in fine grinding . The NaPA chain length can act in spatial steric hindrance, and its surface electric charge fulfils the function of electrostatic stability.…”