Bentonite 지질환경과학과Introduction Mineralogical characteristic Industrial use Occurrence Distribution of deposits“Bentonite” is not an exact mineral name Composed of Smectite mineral Extensive range of industrial applications “Bleaching earths” ( 산성백토 , 표백토 ) Natural state or chemical, physical activation Bleaching earths do not have a defined composition, but smectite is their main component. IntrodcutionBentonite is an absorbent aluminium phyllosilicate. Origin : the in situ alteration of volcanic ash or tuff Bentonite is many different types Sodium bentonite Calcium bentonite Potassium bentonite Element potassium (K), sodium (Na), calcium (Ca), and aluminium (Al) Mineralogical characteristicpH : 9.0-10.5 Crystal structure Hardness : 1∼1.5 Physical characteristic expansibility, coking property, enrichment, cation exchange capacity, colloid, lubricativeMontmorillonite ≒ Bentonite Al 3+ - Mg 2+ + Na + : Na-bentonite 2Al 3+ - 2Mg 2+ + Ca 2+ : Ca-bentonite We use Na-bentonite . (95% ↑) Every efficiency of Na-bentonite is excellent. Potassium bentonite is a potassium-rich illitic clay formed from alteration of volcanic ash.Structure transition Gibbsite layer ; imbalance of electric charge - edge (+), surface (-) Thus water molecules are adsorbed onto the layer. : House of Cards StructureGeneral use Drilling mud, foundry molding sand, decolorization of oil, cat litter(Pelletization), cement, adhesives, ceramic bodies, cosmetic products… Medical use Bentonite slurry walls Industrial useGeneral use drilling mud Water + Na-Bentonite = drilling fluid Function of the drilling fluid : remove cuttings, control pressure, maintain borehole zone stability, lubricate the drill string, protect producing zoneCritical specification 1. Thixotropy 2. Suspension and filtrate properties 3. Amount of coarse material 4. Moisture contentfoundry molding sand Sand + Na/Ca-Bentonite Important foundry properties 1. green compression strength 2. dry compression strength 3. hot strength 4. flowability 5. permeability 6. durabilitydecolorization of oil acid clay Bentonite ≒ Acid clay - Si ↑, Al ↓, acidic, adsorptive ; used acid-activated bentonite and Fuller’s earth To decolorize mineral, vegetable, and animal oils.Pelletization Bentonite Animal pellet, Wood pellet, Iron pellet… (food, sand etc… ; product of adequate size)Medical use bulk laxative battlefield wound dressings Shield of poison ivy or poison oakBentonite slurry walls Be used in construction. Digging - filled slurry (bentonite) Fluid is removed - Fluid form Slurry wall Therefore prevent the seepage of groundwater Commonly use water-blocking (bentonite fill in pore space)Origin : In situ alteration of volcanic ash or tuff Process : involves devitrification of the ash - hydration of the devitrified products - crystallization of smectite Shallow marine, Freshwater, Estuaries and Lagoons, Desert Pan, Coal-forming environments. = marine deposit OccurrenceMesozoic era, Cretaceous period (and Tertiary Period, rarely Paleozoic Era) Most high-grade natural Na-bentonite is produced from the western United States in an area between the Black Hills of South Dakota and the Bighorn Basin of Wyoming. Distribution of deposits국내 산출지 경북 월성군 , 경남 울주군 지역 등 경상남북도 일원의 제 3 기 육성층의 화산성 응회암층 Global Main deposits is the United States (Arizona, Wyoming, California…) Greece, Japan, Italy, Argentina, Brazil, Spain, Hungary, Romania, Poland, Peru, Mexico, Republic of South Africa…* Distribution of deposits map한국벤토나이트 ( 주 ) http://www.koben.co.kr/index.html 일성케미칼 http://www.ilsungchem.co.kr/ ㈜범양이엔씨 http://www.pumyangenc.co.kr/business/business_01_1.php 한국자원정보서비스 http://www.kores.net/main.do 네이버 지식백과 http://terms.naver.com/entry.nhn?docId=777687 mobile categoryId=2595 http://terms.naver.com/entry.nhn?docId=514499 mobile categoryId=3296 위키피디아 http://en.wikipedia.org/wiki/Bentonite http://en.wikipedia.org/wiki/Pelletizing 사진 http://www.pipeliners-uk.com/photo3_7.html http://www.submarineboat.com/shop_foundry.htm http://dyfuze.en.alibaba.com/product/529249269-213262867/Activated_Bleaching_Clay_for_Castor_Oil.html http://elements.geoscienceworld.org/content/5/2/93/F2.large.jpg References수고하셨습니다 . 감사합니다{nameOfApplication=Show}
