Characteristics of precipitated calcium carbonate by hydrothermal and carbonation processes with mega-crystalline calcite using rotary microwave kiln

CaCO3-decorated cellulose aerogel for removal of Congo Red from aqueous solution

“…As can be seen in the inset to Fig. 1d, a layer of CaCO 3 particles was formed on the cell wall of the cellulose aerogel, while the presence of cubicalshaped CaCO 3 can also be observed, being a characteristic shape of calcite (Flaten et al 2010;Wu et al 2010;Hwang et al 2014). Meanwhile, the XRD pattern obtained for both Gel-0 and Gel-CaCO 3 is shown in Fig.…”

Preparation of high purity PCC from medium- and low-grade limestones using the strongly acidic cation exchange resin

“…1(a)). Calcination conditions for limestone were 950 8C for 60 min (heating rate 19 8C/min, sample weight: 500 g) [1][2][3].…”

“…However, SiO 2 in limestone directly affects the resulting purity. Generally, the impurity limit of limestone is less than 4-5% of (SiO 2 + Al 2 O 3 + Fe 2 O 3 ) and 0.1-0.2% of (Na 2 O + K 2 O) [1][2][3].…”

“…Major construction and structural characteristics of RMK (rotary microwave kiln), and calcinations and operation characteristics of carbonate minerals were reported by Hwang et al [3,18]. They described major construction characteristics of RMK and the calcinations characteristic according to the feeding amount of the calcined material.…”

“…Lime of high reactivity and calcination degree can be obtained inexpensively using a microwave kiln compared to a shaft kiln or rotary kiln. However, the microwave kiln suffers technical problems that need to be solved for commercialization [1][2][3].…”