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습식구형조립법의 조립기구-조립물의 입도 분포에 미치는 실험인자의 영향-
Spherical Agglomeration Mechanism by Wet Processing Technique-Effect of Experimental Factors on the Size of Agglomerates and Its Distribution
HWAHAK KONGHAK, October 1985, 23(5), 329-336(8), NONE
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Abstract
터어빈형 교반기를 설치한 원통형 조립기를 사용, 미분말 유기용매의 분산계에 미분말을 선택적으로 적시는 액체가교제를 첨가, 교반조립하는 습식구형 조립실험을 실시하여 그 조립기구를 검토하였다.
생성조립물의 입도분포는 Rosin-Rammler의 분포측에 따르고 수 mm의 미세한 구형조립물의 생성은 액체가교제의 조립문내 공극체적 포화도가 70±20 %일 때였다.
생성조립물의 중량평균율은 정미비에너지 총두입량에 비례하여 성장하였으며, 가교액제 첨가량 교반속도, 교반시간등의 변화에 의해 조절될 수 있었다.
입자간 응집력과 교반파괴력과의 평형관계에서 생성조립물의 크기는 응집력에 관련된 인자의 함수로써 표시할 수 있었다.
생성조립물의 입도분포는 Rosin-Rammler의 분포측에 따르고 수 mm의 미세한 구형조립물의 생성은 액체가교제의 조립문내 공극체적 포화도가 70±20 %일 때였다.
생성조립물의 중량평균율은 정미비에너지 총두입량에 비례하여 성장하였으며, 가교액제 첨가량 교반속도, 교반시간등의 변화에 의해 조절될 수 있었다.
입자간 응집력과 교반파괴력과의 평형관계에서 생성조립물의 크기는 응집력에 관련된 인자의 함수로써 표시할 수 있었다.
The mechanism of spherical agglomeration in the wet system is examined with agitating the suspension of fine particles in organic liquid, with small added amount of a second bringing liquid, which preferently wets the particles.
The spherical agglomerates can be produced in a cylindrical vessel equipped with the turbine type of rotating agitator, using mainly the calcium carbonate-chloroform-water system.
The spherical microagglomerates were formed when the bridging liquid was occupied between 51 % and 90 % of the void volume among the agglomerated products.
The particle size distribution of agglomerates was found to take the Rosin-Rammler's distrinution function. It was also found that the size of agglomerates was increased with the increase of total specific net input energy during agglomeration process and it could be controlled by experimental factors such as added amount of bridging liquid, agitation speed, and agitation time.
Furthermore, the size of agglomerates was expressed with the function of cohesive factors involved in the wet system based on the equilibrium state of cohesive force and destructive force.
The spherical agglomerates can be produced in a cylindrical vessel equipped with the turbine type of rotating agitator, using mainly the calcium carbonate-chloroform-water system.
The spherical microagglomerates were formed when the bridging liquid was occupied between 51 % and 90 % of the void volume among the agglomerated products.
The particle size distribution of agglomerates was found to take the Rosin-Rammler's distrinution function. It was also found that the size of agglomerates was increased with the increase of total specific net input energy during agglomeration process and it could be controlled by experimental factors such as added amount of bridging liquid, agitation speed, and agitation time.
Furthermore, the size of agglomerates was expressed with the function of cohesive factors involved in the wet system based on the equilibrium state of cohesive force and destructive force.
