In　order　to　solve　the　difficulty　of　high　cost　and　wide　industrialization　in　the　traditional　techniques　of　extracting　potassium　and　aluminum　from　alunite,　the　alunite　floated　from　the　tailings　of　Zijin　copper　ore　was　processed　by　non-roasting　pressure　acid-leaching.　Compared　with　normal　pressure　leaching　process,　it　can　not　only　improve　the　leaching　ratio　of　K　and　Al　to　95.73%　and　98.54%,　respectively,　but　also　have　simpler　technological　route　and　low　cost.　Based　on　experimental　research,　the　optimal　leaching　parameters　are　leaching　temperature　of　220,　acid　to　ore　ratio　(g/g)　of　3:1,　initial　acid　concentration　of　25%,　leaching　time　of　120　min　and　stirring　rate　of　600　r/min.　Analysis　of　the　high　pressure　acid　leaching　residue　by　X-Ray　powder　diffraction　and　scanning　electron　microscope　analysis　indicates　that　crystal　structure　of　alunite　is　completely　destroyed,　and　the　main　chemical　composition　of　leaching　residue　is　SiO2.　©　2016,　Science　Press.　All　right　reserved.