An　efficient　and　recyclable　cadmium　removal　adsorbent　was　prepared　by　molding　and　sintering　of　ultrafine　silica　powder　produced　from　ferroalloy　plant　as　the　main　raw　materials,　with　the　addition　of　a　certain　amount　of　Al(OH)　3　and　CaO　for　modification.　XRD　and　SEM　were　used　to　characterize　the　crystal　phases　and　microstructures　of　the　adsorbent.　The　influences　of　different　pH,　initial　cadmium　concentration　and　contacting　time　on　the　cadmium　adsorption　capacity　were　investigated.　The　results　show　that　the　cadmium　removal　capacity　is　up　to　0.239　mg/g　at　the　initial　Cd2+　concentration　of　5　g/L,　pH　value　of　7　and　contacting　time　of　120　min　when　the　optimum　mass　ratio　is　70(ultrafine　silica　powder):30(Al(OH)3　and　CaO　mixture).　The　corresponding　adsorbent　has　a　porous　structure　with　main　crystalline　phases　of　Ca2Al2SiO7　and　CaSiO3.　Cadmium　is　adsorbed　and　removed　mainly　by　physical　adsorption,　assisted　by　chemical　adsorption.　Copyright　©　2008　Chinese　Journal　of　Structural　Chemistry.