An　efficient　process　was　proposed　for　extracting　chromium　from　chromium-containing　slag　after　desilication　with　aqueous　NaOH　solution.　The　effect　of　the　NaOH　concentration,　liquid-to-solid　mass　ratio,　and　leaching　temperature　on　the　leaching　rate　of　silicon　was　investigated.　The　results　showed　that　83.78%　of　the　silicon,　41.87%　of　the　aluminum,　and　46.42%　of　the　vanadium　were　removed　from　the　slag　under　suitable　conditions.　The　kinetic　analysis　results　showed　that　the　leaching　rate　of　silicon　is　controlled　by　a　chemical　reaction　under　two　regimes　due　to　the　two　silicon-bearing　minerals　presented　in　the　slag.　The　first　stage　is　limited　by　the　reaction　between　NaOH　and　SiO2,　whereas　the　second　stage　is　subject　to　the　reaction　between　NaOH　and　2MgO　center　dot　2Al(2)O(3)center　dot　5SiO(2).　The　corresponding　apparent　activation　energies　were　calculated　to　be　67.27　kJ/mol　and　35.82　kJ/mol,　respectively.　The　extraction　rate　of　chromium　from　the　leaching　residue　using　lime-free　roasting　reached　98.41%,　which　was　highly　superior　to　the　9.85%　obtained　from　the　slag　without　desilication.　(C)　2016　Elsevier　B.V.　All　rights　reserved.