• Title, Summary, Keyword: $CaCO_3$ 제조

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A Study on the Environmental Fraternized Preparation of Inorganic/organic Core-shell Binder (환경친화적인 무기/유기 Core-Shell의 제조에 관한 연구)

  • Seoul, Soo-Duk;Lim, Jae-Keel;Lim, Jong-Min;Kwon, Jae-Beom;Lee, Nae-Woo
    • Journal of the Korean Society of Safety
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    • v.19 no.1
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    • pp.81-87
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    • 2004
  • Composite particles using inorganic and organic chemicals were synthesized and the results of those reaction were compared to variation of temperature and agitation speed in presence of $CaCO_3$ which was adsorbed SDBS. Also the synthesises were optimized according to conversion rate of composite particles. In inorganic/organic core-shell composite particle polymerization, $CaCO_3$ adsorbed by 0.5wt% surfactant SDBS was prepared initially and then core $CaCO_3$ was encapsulated by sequential emulsion polymerization using MMA at the addition of APS 3.16${\times}$$10^{-3}$mol/L to minimize the coagulated PMMA particle itself during MMA shell polymerization. Encapsulated PMMA on $CaCO_3$ as inorganic/organic core-shell particles was verified by FT-IR and DSC analysis. It was found that the $CaCO_3$ was very well encapsulated by PMMA as shell. The surfaces were distinctly found as spindle shape and broad particle distribution after capsulation.

Preparation of Silicone Rubber Membrane and its Porosity (Silicone Rubber Membrane의 제조 및 기공특성)

  • Lee, Seung-Bum;Kim, Hyung-Jin;Hong, In-Kwon
    • Elastomers and Composites
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    • v.30 no.3
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    • pp.185-194
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    • 1995
  • Membrane process has been employed to separate a specific substance from gas or liquid mixture, and treat wastewater. This is due to the fact that the substance of mixture can be permeated and separated selectively by membrane. Since Initial equipment and operation costs are not expensive, membrane process has been adopted in various fields such as petroleum Industry, chemistry, polymer, electronics, foods, biochemical industry and wastewater treatment. In this study, $CaCO_3$ particles impregnated in silicone rubber network were extracted by using supercritical carbon dioxide and pore distribution of silicone $rubber-CaCO_3$ was investigated with varying amount of extract. Silicone rubber has excellent mechanical properties such as heat-resistance, cold-resistance etc. and $CaCO_3$ has microporous structure. It is possible to make silicone $rubber-CaCO_3$ composite sheets via work-intensive kneading processes. In so doing $CaCO_3$ particles become distributed and impregnated in silicone rubber network. Supercritical carbon dioxide diffuse through composite sample, then sample is swollen. $CaCO_3$ in silicone rubber network Is dissolved in supercritical carbon dioxide, and its sites become pores. Pore distribution, pore shape and surface area are observed by SEM(scanning electron microscope) micrograph and BET surface area analyzer examination respectively. Pore characteristics of membrane suggest the possibilities that the membrane can be used for process of mixture separation and wastewater treatment.

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Carbonation of coal fly ash for construction materials (탄산화 건자재 제조를 위한 석탄 비산회의 탄산화)

  • Park, Jun-Young;Kim, Yoo-Taek;Kim, Hyun-Jung
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.22 no.3
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    • pp.147-151
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    • 2012
  • Carbon dioxide ($CO_2$) could be stored in the form of Ca and Mg compounds including alkaline earth metal by carbonation. The possibility of $CO_2$ storage was tested by using desulfurized ash from fluidized bed type boiler as raw material. Autoclave was used for maintaining the reaction pressure and temperature for the carbonation. The analysis of weight change rate, XRD, and TG/DTA proved that more than 15 % of carbonation rate was obtained under 10 $kgf/cm^2$ and $120^{\circ}C$-10 min.

Syntjesos of Stoichiometric Hydroxyapatite Powder by $CO_3$$^{2-}$ Substitution During Precipitation ($CO_3$$^{2-}$치환을 이용한 화학양론조성 수산화 아파타이트 분말의 합성)

  • 전성재;김석영;한주환
    • Journal of the Korean Ceramic Society
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    • v.35 no.3
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    • pp.209-218
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    • 1998
  • Ca-deficiency frequently observed in the hydroxyapatite powders prepared by precipitation which is known to be deleterious for its application to biomaterials was prevented by the technique developed in this study. In addition the prepared powder has been revealed to be quite active that full density is achieved at temperatures as low as 100$0^{\circ}C$ Instead of using N2 air was chosen as the processing atmosphere during the precipitation and aging of hydroxyapatite. {{{{ {CO }`_{3 } ^{2- } }} ions from the processing atmosphere(air) substitute partly for {{{{ {PO }`_{4 } ^{3- } }} ions in the hydroxyapatite and its content can be controlled by pH of the solution where the pre-cipitation reaction occurs.

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Preparation and Sound Insulation Properties of Thermoplastic Elastomer Composites with CaCO3 Filler (탄산칼슘 분말을 충진시킨 열가소성 탄성체 복합재의 제조 및 차음 특성)

  • Choi, Jung-Woo;Hwang, Yeon
    • Korean Journal of Materials Research
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    • v.20 no.9
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    • pp.467-471
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    • 2010
  • Composites of ceramic powders and an elastomer-based matrix were prepared by mixing $CaCO_3$ powders with polyethylene and polypropylene elastomers, and their mechanical and sound insulation properties were measured. $CaCO_3$ powders with 0.7 ${\mu}m$ and 35 ${\mu}m$ particle size were added to elastomers up to 80 wt%. Scanning electron microscopy photographs showed uniform distribution of the $CaCO_3$ powders in the matrix. While density and surface hardness increased, melt index, tensile strength and elongation of the composites decreased as the amount of added $CaCO_3$ powders increased. As more $CaCO_3$ powders were added sound transmission loss of the composites increased owing to the increase of density. Addition of 0.7 ${\mu}m$ sized $CaCO_3$ powders resulted in a slightly higher transmission loss than the addition of 35 ${\mu}m$ sized powders because of the increased interface area between the elastomer matrix and the $CaCO_3$ powders. Composites with a polyethylene matrix showed higher transmission loss than those with a polypropylene matrix because the tensile strength and hardness of the polyethylene-based composites were low and their elongation was high.

The Recycling of Inorganic Industrial Waste in Cement Industry (시멘트산업에서 무기질 산업 폐·부산물의 재활용)

  • Kang, S.K.;Nam, K.U.;Seo, H.N.;Kim, N.J.;Min, K.S.;Chung, H.S.;Oh, H.K.
    • Clean Technology
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    • v.6 no.1
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    • pp.61-69
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    • 2000
  • In this study, generation process and properties of inorganic industrial waste which can be used in cement industry were investigated. The scheme of recycling to use the selected waste as raw materials, mineralizer and flux, admixture and raw materials for special cement was decided and then various experiments were carried out. The experimental results were as follows ; In the use of industrial waste as raw materials, ferrous materials could be substituted by Cu-slag, Zn-slag, electric arc furnace or convertor furnace slag etc., and a siliceous material could be substituted by sand from cast-iron industry. By-products from sugar or fertilizer industry, which has $CaF_2$ as the main component, and jarosite from Zn refinery enabled clinker phases to be formed at lower temperature by $100{\sim}150^{\circ}C$. Adding Cu slag and STS sludge in proper proportion to cement improved properties of cement. Fly ash and limestone powder as admixture had the same effect on cement. As a raw material for special cement, aluminium waste sludge could be used in making ultra early strength cement, which had the compressive strength of $300kg/cm^2$ within 2hours. And two different ashes from municipal incinerator could be raw materials of the cement which was mainly composed of $C_3S$ and $C_{11}A_7{\cdot}CaCl_2$ as clinker phases.

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Preparation and Characterization of Porous Filters from Ca(OH)2 and CaCO3 for SO2 Removal in Dry-FGD Process (건식 FGD 공정에서 SO2 제거를 위한 Ca(OH)2 및 CaCO3 원료의 다공성 필터 제조 및 특성)

  • Han, Yo-Seop;Kim, Hyun-Jung;Park, Young-Goo;Park, Jai-Koo
    • Applied Chemistry for Engineering
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    • v.16 no.6
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    • pp.772-777
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    • 2005
  • Porous hydrated lime and limestone filters were prepared by foaming and gelcasting method, and their physical properties were evaluated. Through these analyses, it has been found that with the increased porosity and pore size of the filters, majority of pores in the filters were inter-connected by windows. Also, $SO_2$ removal efficiency for the filters was investigated. As the porosity and the reaction temperature increased, $SO_2$ removal efficiency also increased. Especially, unlike the variation of entrance concentration, the entrance flow rate had great influence on the removal efficiency. In case of the filters with an equal porosity, the hydrated lime filter had superior removal efficiency compared to the limestone filter. From these results, it was shown that the high conversion ratio to CaO from the hydrated lime filter was a result of facilitated formation of $CaSO_4$ by $SO_2$.

Production of Vaterite Type Calcium Carbonate by using Oyster Shell Waste with Lysine (라이신 첨가에 의한 폐 굴껍질 이용 vaterite형 탄산칼슘 제조)

  • Bak, Young-Cheol
    • Korean Chemical Engineering Research
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    • v.59 no.1
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    • pp.118-126
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    • 2021
  • The experiments to produce the vaterite type calcium carbonate were conducted for using the waste oyster shell as the recycling resources. Firstly, the oyster shell were calcinated at 800 ℃ for 24 h. Calcinated oyster shell were reacted with the nitric acid solution, and were diluted to 0.1 M Ca(NO3)2 solution. This solution was mixed with 0.1 M Na2CO3 contained 0.1 mol lysine/1 mol CaO at 20 ℃ and 600 rpm mixing condition for 1 h. The reaction products were identified to vaterite type calcium carbonate (84.5% vaterite, 15.5% calcite) by XRD and SEM analysis. Mean particle diameter was 6.87 ㎛, and the lysine content in calcium carbonate was analyzed to 0.1%.

Preparation of Feed Glass Materials for Producing a Foamed Borosilicate Glass Body from Waste LCD Panel (폐 LCD판넬로부터 붕규산유리 발포체 제조를 위한 원료 유리 제조)

  • Oh, Chi-Hoon;Park, Yoon-Kook;Lee, Chul-Tae
    • Applied Chemistry for Engineering
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    • v.27 no.4
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    • pp.371-379
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    • 2016
  • In this article, the foamed body of glass was manufactured from the waste borosilicate glass produced by wet pulverization process without additional pretreatment which can be used as a recycling method for waste LCD panel glass. Each 100 g of pulverized waste borosilicate glass with the size of less than 270 mesh were mixed with 0.3 weight fraction of carbon and 1.5 weight fraction of $Na_2CO_3$, $Na_2SO_4$ and $CaCO_3$ and let them foamed for 20 minutes at $950^{\circ}C$ to manufacture the foamed body having the density of less than $0.3g/cm^3$. Additionally, adding $SiO_2$ or $H_3BO_3$ to the mixture enabled the foamed body to have efficient formation of open pores which showed the possibility for producing the foamed body with new functionalities such as sound absorption.

Production of High purity $Mn_3O_4$Powder by Precipitation of Calcium fluoride in the Manganese Leaching Solution (망간침출액에서 불화칼슘화에 의한 高純度 망간酸化物의 製造)

  • 한기천;이계승;최재석;신강호;조동성
    • Resources Recycling
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    • v.11 no.1
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    • pp.3-8
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    • 2002
  • In order to make the high purity Mn$_3$O$_4$powder for the raw material of soft ferrite, Mn is extracted from the dust and the extracted solution is refined. The dust is generated in producing a medium-low carbon ferromanganese and contains 90% Mn$_3$O$_4$. Mn$_3$O$_4$in the dust was reduced into MnO by roasting with charcoal. Injection of the 180g/L of the reduced dust into 4N HCI solution increased pH of the leaching solution higher than 5 and then a ferric hydroxide was precipitated. Because the ferric hydroxide co-precipitates with Si ion etc, Fe and Si ion was removed from the solution and the about 10% Mn solution was obtained. The solution was diluted with water to Mn-15000 ppm and $NH_4$F was injected into the diluted solution at $70^{\circ}C$ to the F-3000 ppm. As a result, Ca ion is precipitated as $CaF_2$and the residual concentration of Ca was 14 ppm. Injection of the equivalent (NH$1.5M_4$)$_2$$CO_3$solution as 2 L/min at $25^{\circ}C$ into the above solution precipitated a fine and high purity $MnCO_3$powder. The deposition was filtrated and roasted at $1000^{\circ}C$ for 2 hours. As a result, $MnCO_3$powder is converted into $Mn_3$$O_4$powder and it had $8.2\mu$m of median size. The final production is above 99% $Mn_3$$O_4$powder and it satisfied the requirement of high purity $Mn_3$$O_4$powder for a raw material of soft ferrite.