Aiming　to　solve　the　disadvantage　of　significant　energy　consumption　and　excessive　acid　consumption　in　traditional　sulfuric　acid　method　to　extract　lithium　from　α-spodumene,　a　novel　pyro-hydrometallurgical　process　was　proposed　by　combining　flash　roasting　for　phase　transformation　with　sulfuric　acid　pressure　leaching.　The　effects　of　flash　roasting　parameters　(temperature,　time,　particle　size)　on　phase　transformation　and　pressure　leaching　conditions　(H2SO4　addition　amount,　liquid–solid　ratio,　temperature,　time)　on　lithium　extraction　were　systematically　investigated.　The　optimal　experiment　results　showed　that　the　naturally　existed　α-spodumene　can　be　transformed　into　β　phase　at　1050　°C　with　10　min　by　flash　roasting.　The　encapsulated　Li+　subsequently　released　with　less　sulfuric　acid　and　underwent　exchange　with　H+.　High-efficiency　leaching　of　Li　with　relatively　low　co-leaching　of　Al　and　Si　impurities　was　achieved　by　pressure　leaching　at　200　°C　with　much　less　sulfuric　acid　consumption.　The　leaching　efficiency　of　Li,　Al　and　Si　were　94.7　%,　36.2　%　and　0.14　%,　respectively.　Kinetic　analysis　indicated　that　the　sulfuric　acid　pressure　leaching　process　fitted　well　with　the　shrinking　core　model.　An　economic　evaluation　of　this　novel　process　was　also　conducted　aiming　to　provide　more　guidance　for　its　industrial　application.　©　2025　Elsevier　Ltd