Silicon　fertilizer　was　produced　by　coal-cinders　yielded　from　the　catalysis　and　gasification　of　eight　kinds　of　anthracites　in　Fujian　Province,　with　additives　together　calcinations　during　de-alkali.　The　results　indicate　that　the　de-alkali　rate　could　be　raised　up　to　100%　under　adding　5%　kaoline　in　the　alkali　coal-cinders　and　calcinations　temperature　870°C　for　30-40　minutes.　Simultaneously,　the　available　SiO2　content　in　the　de-alkali　coal-cinders　give　in　excess　of　20%　as　the　standard　of　silicon　fertilizer.　The　calcined　cinders　were　analyzed　by　XRD　and　SEM.　It　was　clearly　seen　that　under　an　appropriate　calcinations　temperature,　the　activated　SiO2　and　Al2O3　contained　in　the　additives　and　coal-cinders　will　reacted　to　Na2CO3　in　fusing　and　form　a　new　neutral　matter　as　the　nepheline　and　a　variety　of　amorphous　compounds　of　silicate,　and　the　harmless　treatment　and　resource　of　silicon　fertilizer　for　the　alkali　coal-cinders　are　realized.