the kedah calcium carbonate paper project malaysia

the kedah calcium carbonate paper project malaysia

 

in the northern malaysian state of kedah near the border with thailand a sophisticated industrial project is producing ultrafine calcium carbonate for the paper industry. this is the kedah calcium carbonate paper project which features an advanced wet grinding mill stone powder grinding mill with a capacity of 12 tons per hour. the raw material is high-purity limestone from the famous deposits of the langkawi islands just off the coast of kedah where ancient coral reefs have been transformed into some of the purest calcium carbonate in southeast asia.

 

the wet grinding process was chosen specifically for the paper industry which requires calcium carbonate in slurry form. the limestone is ground with water and a small amount of dispersant in a series of agitated bead mills to achieve a target fineness of 1.5 microns. this is an extraordinary level of fineness far below the typical range for dry grinding far exceeding the specified range of 6 to 300 microns and represents the high end of what is technically achievable in mineral processing.

 

this ultrafine calcium carbonate slurry is used as a coating pigment in the production of high-quality printing and writing paper. the 1.5 micron particles create an exceptionally smooth and glossy surface on the paper when applied as a coating after the paper web is formed. this coated paper provides superior print quality for magazines catalogs and annual reports. the slurry is supplied directly in liquid form by tanker trucks to a major paper mill in the kedah region that exports its products to markets throughout southeast asia and the middle east.

 

the project faced immense technical challenges in achieving and maintaining the 1.5 micron fineness consistently. the solution was to employ a multi-stage grinding process with continuous particle size monitoring by laser diffraction technology. each stage uses progressively smaller grinding media down to beads less than one millimeter in diameter to achieve the final fineness without damaging the crystal structure of the calcium carbonate.

the entire process is controlled by a distributed control system that automatically adjusts grinding parameters to maintain the target particle size distribution with remarkable precision. this stone powder grinding mill project in kedah represents the cutting edge of mineral processing technology supplying critical raw materials to the paper industry with a level of quality and consistency that meets the most demanding international standards.