Yoshizawa Lime Industry Corporation

Sano, Japan

Yoshizawa Lime Industry Corporation

Sano, Japan
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Jamshidi A.,Yoshizawa Lime Industry Co. | Kurumisawa K.,Hokkaido University | Nawa T.,Hokkaido University | Jize M.,Harbin Engineering University | White G.,University of The Sunshine Coast
Journal of Cleaner Production | Year: 2017

Pavements are one of the most energy-intensive infrastructure assets that depend on non-renewable natural resources. Against the background of restrictions on landfill disposal, the increased use of alternative materials such as industrial byproducts in pavement construction has gained great attention from academic and industrial sectors. However, comprehensive research covering various aspects of pavements incorporating different byproducts is lacking. The main purpose of this state-of-the-art study is to bridge this gap via the analysis of the performance of pavements incorporating two types of byproducts, blast furnace slag, and fly ash, from the perspectives of structural performance, energy saving potential, and greenhouse gas emission reduction at various phases of pavement life. Therefore, the contents of 150 published documents, including research papers, theses, and academic and industrial reports published over a span of 49 years (1968–2017) were analyzed. The major findings indicated that incorporation of the byproducts may have positive or negative consequences in various phases of pavement life. However, the new pavements are advantageous from the viewpoint of raw material processing because of low consumption of raw materials and pertinent environmental footprints. In addition, several scenarios are proposed for ranking the alternative materials on the basis of the technical and environmental requirements for a paving project; these scenarios can be useful for the preliminary selection of alternative materials. Finally, some gaps are highlighted for future research. © 2017 Elsevier Ltd

Yasue S.,Kanagawa Institute of Technology | Sawai J.,Kanagawa Institute of Technology | Kikuchi M.,Kanagawa Institute of Technology | Nakakuki T.,Yoshizawa Lime Industry Co. | And 2 more authors.
Biocontrol Science | Year: 2014

Dolomite is a double salt composed of calcium carbonate (CaCO3) and magnesium carbonate (MgCO3). The heat treatment of CaCO3 and MgCO3 respectively generates calcium oxide (CaO) and magnesium oxide (MgO), which have antimicrobial activity. In this study, heated dolomite powder (HDP) slurry was investigated for its sporicidal activity against Bacillus subtilis ATCC 6633 spores. The B. subtilis spores used in this study were not affected by acidic (pH 1) or alkaline (pH 13) conditions, indicating that they were highly resistant. However, dolomite powder heated to 1000°C for 1 h could kill B. subtilis spores, even at pH 12.7. Sporicidal activity was only apparent when the dolomite powder was heated to 800°C or higher, and sporicidal activity increased with increases in the heating temperature. This temperature corresponded to that of the generation of CaO. We determined that MgO did not contribute to the sporicidal activity of HDP. To elucidate the sporicidal mechanism of the HDP against B. subtilis spores, the generation of active oxygen from HDP slurry was examined by chemiluminescence analysis. The generation of active oxygen increased when the HDP slurry concentration rose. The results suggested that, in addition to its alkalinity, the active oxygen species generated from HDP were associated with sporicidal activity.

Toshiyuki K.,Kyushu University | Nagato S.,Kyushu University | Hirajima T.,Kyushu University | Sasaki K.,Kyushu University | And 2 more authors.
Chemical Engineering Journal | Year: 2016

Hydroxylated calcined dolomite (HCD) is practically used as a mineralizer to immobilize fluoride by co-precipitation with hydroxyapatite (HAp) and precipitation as fluoroapatite (FAp). It has an advantage to remove fluoride without stagnation, which is always observed with Ca(OH)2 alone. HCD includes a certain content of MgO and Mg(OH)2 as well as Ca(OH)2. In the present work, the mechanism to explain the enhancing role of Mg components on removal kinetics of fluoride was aimed to elucidate. Nano-domain observation approaches were conducted by TEM when Ca(OH)2 is added as a Ca source in the presence of different Mg2+ concentrations, instead of HCD. With increase in Mg2+ concentrations in the presence of Ca(OH)2, removal rate of fluoride was enhanced. The enhancement was also observed with HCD. Mg2+ and [Mg(OH)]+ species, which can be derived from HCD, are adhered to the negatively charged c-plane of freshly formed amorphous HAp/FAp and CaCO3. As a result, the surface of Ca(OH)2 particles are gotten rid of hetero-coagulation with HAp/FAp and CaCO3 in the presence of Mg2+ and [Mg(OH)]+ species, and maintained to release Ca2+ and OH- ions, facilitating to precipitate HAp and FAp for immobilization of fluoride. Without Mg2+ additives the Ca(OH)2 surfaces are blocked by insoluble HAp/FAp through hetero-coagulation. This interpretation is also supported by TEM observation, which is well consistent with XRD results. The findings indicate that MgO and Mg(OH)2 contents in HCD influence the removal kinetics of fluoride by (co-)precipitation as apatites in industrial water treatment. Understanding the surface science in nano-domain is important in parallel reactions of dissolution and precipitation. © 2015 Elsevier B.V.

Ozawa K.,Japan National Institute of Materials Science | Okada R.,Yoshizawa Lime Industry Co. | Nakao Y.,Honda Engineering Co. | Ogiwara T.,Ashikaga Institute of Technology | And 3 more authors.
Journal of the American Ceramic Society | Year: 2010

The simplified one-step hydrothermal synthesis, in which SiO 2 is directly reacted with aqueous NaOH in the presence or absence of tetrapropylammonium bromide (TPABr) and tetrabutylammonium bromide (TBABr) as the template compound, was investigated. The reaction in the absence of the template compounds leads to the production of pure magadiite, whereas pure Si-ZSM-5 is produced by the reaction in the presence of TPABr. On the other hand, crystalline magadiite/Si-ZSM-11 composites are synthesized by the reaction in the presence of TBABr. Furthermore, for the composites, the particle sizes of the magadiite and Si-ZSM-11 may be influenced by the TBABr concentrations. It was also found that the compositions of magadiite and Si-ZSM-11 in the composites can be controlled by regulating the NaOH concentrations. © 2010 The American Ceramic Society.

Naruse T.,Yoshizawa Lime Industry Co. | Ken T.,Yoshizawa Lime Industry Co. | Kawashima T.,Yoshizawa Lime Industry Co.
Key Engineering Materials | Year: 2014

This study evaluated the fluorine removal capacity of half-burnt dolomite and examined the removal mechanism. As the result of examining the burning conditions of dolomite, it was found that dolomite burnt at 1023 K for 4 h has the highest performance. It turned out the fluorine removal mechanism that CaCO3 does not contribute to reaction and that fluorine is sorbed with hydration of MgO. As the result of comparing removal capacity by changing the initial pH of fluorine solutions, it was found that performance is reduced in the strong alkaline solution. © (2014) Trans Tech Publications, Switzerland.

Nakai Y.,Jfe Holdings | Kikuchi N.,Jfe Holdings | Miki Y.,Jfe Holdings | Kishimoto Y.,Jfe Holdings | And 2 more authors.
ISIJ International | Year: 2013

Hot metal desulfurization behavior with dolomite flux was examined in heat treatment tests of pellets and in small-scale and commercial-scale hot metal desulfurization tests by mechanical stirring. In the heat treatment tests of pellets, the Mg gas generation ratio at 1 673 K increased as the CaO/MgO ratio increased. The Mg gas generation ratio reached 90% with dolomite, which was 1.4 times higher than that with CaO + MgO at the same CaO/MgO. With calcined dolomite and Al ash, CaO efficiency for hot metal desulfurization at 1 673 K was 20-30%, which was around double the results with CaO + MgO and CaO. In the desulfurization slag, sulfur was concentrated not with Mg, but Ca and Al were found in an EPMA analysis and detected as CaS by X-ray diffraction. Desulfurization with calcined dolomite and Al ash is considered to proceed by {circled digit one} desulfurization by Mg(g) and fixing of MgS as CaS, and {circled digit two} desulfurization by CaO with Mg de-oxidation. 200 t commercial-scale hot metal desulfurization tests with mechanical stirring were carried out. The obtained Mg efficiency for desulfurization was in the range of 15-25% with Mg consumption of 1-1.3 kg/t as MgO. These results were within the same trend as in other studies using metallic Mg and MgO with Al. © 2013 ISIJ.

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