Abstract
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Two processes to make geopolymer pellets from coal preparation refuse (CPR) were developed according to activators: sodium hydroxide and limestone. One process made pellets through pulverizing of CPR, combustion,pulverizing, and pelletizing using sodium hydroxide solution as a binder. The other made pellets through pulverizing CPR and limestone, combustion, pulverizing, and pelletizing using water as a binder. Strength of the pellets in the first process was in proportion to concentration of sodium hydroxide solution and curing temperature. Pellets of the second process were cured by daily repetition of submerging and curing at 70℃ after curing for 1 day. Strength of the pellet comprising 15% limestone showed crushing strength over 120 kgf after 4 days curing.
선탄경석을 지오폴리머의 원료로 활용하여 구형의 펠릿(pellet)을 제조하는 공정을 개발하였다. 활성물질(activator)로서 수산화나트륨과 석회석을 활용하는 두 가지 공정을 구상하고 수산화나트륨의 농도, 석회석의 함량, 양생시간과 온도에 따라 펠릿을 제조하여 강도를 조사하였다. 수산화나트륨을 사용한 경우는 선탄경석을 분쇄, 과립(pelletizing), 연소, 해쇄하여 회분의 분말을 제조하고 이를 과립할 때에 수산화나트륨의 용액을 분무하였다. 펠릿의 강도는 수산화나트륨의 농도와 양생온도에 비례하는 것으로 나타났다. 석회석을 사용한 경우는 선탄경석과 석회석을 함께 분쇄하고 이를 과립, 연소, 해쇄하여 선탄경석의 회분과 하소된 석회석의 혼합분말을 제조하였다. 이를 물로 과립하여 1일 양생한 후에 물에서의 침적과 70℃에서의 양생을 매일 반복한 결과, 석회석 15%의 펠릿이 4일째 120 kgf를 초과하는 압축강도를 나타내었다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 47
- No :2
- Pages :199-206
Journal of the Korean Society of Mineral and Energy Resources Engineers
