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    Estimation of the Bond's grindability from sink-float test data for two different pumices
    (Grup Matbaacilik, 2009) Deniz, Vedat; Umucu, Yakup; Çayirli, Serkan
    In this study, a method for calculating the Bond's grindability by the sink-float test data of pumice was studied. Primarily, the cumulative weight and porosity content of the floating fraction have been determined for two different pumice samples in all relative densities tested. Then, grindability of the pumice samples is determined for its constituent specific gravity fractions. Though the grindability of the constituent specific gravity fractions of both the pumices varies in a systematic manner, certain differences, however, can be observed in the variation pattern between the two pumices which are easy washability and moderate difficult washability characteristic pumices. The relationships between the Bond's grindability and relative densities and between the Bond's grindability and porosity have been stated as simple equations and the calculated values from equations have been compared with the experimental results. Finally, the float-sink test results can be stated by simple equations relating to the Bond's grindability value. The Bond grindability (Gb) is easily measured by carrying out sink-float separation, and by measuring the constituent relative density fractions and porosity content.
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    SURFACE MODIFICATION OF CALCITE: PART I. PRODUCTION TECHNOLOGY AND USED EQUIPMENTS
    (Chamber of Mining Engineers of Turkey, 2020) Çayirli, Serkan
    Calcite, an industrial raw material, is used as filler mineral in many sectors. In general, the calcite, which is comminute to micronized sizes, is subjected to a surface modification process to convert its hydrophilic structure to a hydrophobic structure. Thus, the product price of micronized+coated calcite increases, while it is better suited to the structure and to improve the final product characteristics in the areas where it is used. Micronized calcite production is performed in grinding circuits and coating is carried out in another process. The surface modification process is based on the method of coating the surface with a coating agent and different coating systems have been developed on the industrial scale. In this study, current information about the surface modification mechanism of calcite, processes, and equipment used are given and application examples are examined. The tests, quality control processes and previous studies performed in the coated calcite sector are presented in Part II. © 2020 Union of Chambers of Engineers and Architects of Turkey. All rights reserved.
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    SURFACE MODIFICATION OF CALCITE: PART II. CHARACTERIZATION METHODS AND QUALITY CONTROL PROCESSES
    (Chamber of Mining Engineers of Turkey, 2020) Çayirli, Serkan
    In the sectors where calcite is used as filling material, it is desirable to have the surface modified (coated) in terms of compatibility with the structure and its advantages. Many methods and processes can be applied to characterize the ore both in laboratory scale and industrial scale before and after industrial micronized calcite production. These methods and analyzes provide useful knowledge. In addition, they allow the selection of the process appropriate to the technological requirement of usage of calcite, the proper control of the existing process and the realization of R & D studies. Surface modification mechanism of micronized calcite, processes and equipment used are explained in Part I, characterization methods, quality control processes and some of the previous studies are presented in this review. © 2020 Union of Chambers of Engineers and Architects of Turkey. All rights reserved.