The　stabilization/solidification　approach　has　received　considerable　attentions　for　the　disposal　of　hazardous　metal-bearing　mine　tailings.　A　poor　understanding　of　the　immobilization　mechanism　of　heavy　metals　in　final　products　always　restricts　its　practical　applications.　We　reported　that,　the　stabilization　of　toxic　heavy　metals　(Zn,　Pb,　Cd　and　Cu)　in　bricks　made　from　the　lead　and　zinc　mine　tailings　(LZMT)　was　highly　dependent　on　the　relative　contents　of　SiO2,　Al2O3,　Fe2O3,　CaO　and　MgO　in　LZMT.　As　the　(SiO2 + Al2O3)/(Fe2O3 + CaO + MgO)　ratios　(SA/FCM　ratios)　increased,　the　CPb,　CCd,　or　CCu　in　leachates　slightly　decreased　first　and　then　increased.　Much　differently,　CZn　firstly　increased　and　then　decreased,　having　highest　CZn　(3.92 mg/L　at　30th　day)　at　the　SA/FCM　ratios　of　0.80.　Compared　with　CZn　and　CPb,　a　much　small　CCd　and　CCu　can　be　found.　Notably,　the　CZn　and　CPb　are　also　impacted　by　the　change　of　SiO2:Al2O3　ratios　(and　Fe2O3:CaO:MgO　ratios　as　well).　The　CPb　decreased　as　the　SiO2:Al2O3　ratios　increased　from　1:0.046　to　1:1.354,　while　the　CZn　reached　a　highest　value　at　SiO2:Al2O3　ratio　of　1:0.084.　The　XRD　analysis　suggests　that,　the　Al　and　Si　can　interact　with　Pb　to　form　PbAl2Si2O8,　which　facilitates　the　immobilization　of　Pb2+.　Excessive　amount　of　SiO2　and　Al2O3　bring　the　difficulties　to　forming　stabile　skeletons,　resulting　in　the　leaching　of　Pb　readily.　As　for　Zn,　higher　CZn　is　generally　owing　to　the　occurrence　of　acid-soluble　Zn2SiO4　in　bricks.　The　stabilization　of　Zn　was　achieved　once　Al3+　was　introduced　as　host　to　be　substituted　by　Zn2+　in　the　aluminate　or　aluminosilicate　matrix.　The　findings　could　enrich　the　mechanistic　understanding　and　pathway　of　heavy　metals　immobilization　in　eco-environmental　products　from　LZMT.　©　2016　Elsevier　Ltd