Through　the　XRD　and　XRF　analysis　of　the　converter　steel　slag,　we　can　identify　the　chemical　components　and　the　mineral　phase　and　ensure　the　extraction　method　of　RO　phase　from　steel　slag.　The　possibility　of　the　extraction　of　silicate　phase　from　steel　slag　with　Salicylic　acid　ethanol　(SAE)　solution　was　studied　firstly.　Then,　the　effect　of　dissolution　temperature　of　steel　slag,　dissolution　time　of　the　samples,　concentration　of　salicylic　acid　and　specific　surface　area　of　steel　slag　on　the　extraction　mass　of　silicate　phase　were　analyzed　by　orthogonal　experiment,　and　the　optimum　experiment　conditions　of　the　extraction　of　silicate　phase　from　steel　slag　with　SAE　solution　were　concluded.　Finally,　the　RO　phase　was　obtained　by　the　extraction　and　separation　of　the　intermediate　phase　from　steel　slag　using　potassium　hydroxide-sucrose　(KOSH)　solution.　The　effect　of　extraction　was　determined　by　detecting　the　chemical　and　mineral　composition　of　the　extracted　residue　with　XRD　and　XRF.　The　results　show　that　the　SAE　solution　can　be　used　to　extract　the　silicate　phase　from　steel　slag　and　the　best　extraction　conditions　were　40　degrees　of　dissolution　temperature,　3　h　of　solution　time,　salicylic　acid　concentration　0.2　g/ml　and　the　specific　surface　area　of　steel　slag　600　m2/kg.　Then　the　intermediate　phases　(mainly　C2F)　from　steel　slag　were　extracted　by　KOSH　solution,　which　can　get　a　relatively　pure　RO　phase.　The　experiment　provides　a　basis　for　further　exploring　the　cause　of　the　difference　in　activity　of　RO　phase　and　improving　the　utilization　ratio　of　steel　slag.　©　2017　Trans　Tech　Publications,　Switzerland.