Experimental Study On Dynamic Adsorption Of Heavy Metal Ions With Oceanic Polymetallic Nodules And Cobalt-rich Crust Leaching Residues

Oceanic　polymetallic　nodules　and　cobalt-rich　crusts　are　abundant　ore　resources　which　have　the　potential　value　and　can　been　explored　in　the　future　on　a　large　scale.　The　oceanic　polymetallic　nodules'　tailing　is　ammonia　leaching　residue　and　the　cobalt-rich　crusts'　tailing　is　acid　leaching　residue,　after　wet　extraction　(hydrometallurgy)　of　Ni,　Co,　Cu,　Mn,　Zn　from　the　ores.　The　research　is　the　experimental　study　on　dynamic　adsorption　of　Cu2+,　Cd2+,　Pb2+in　aqueous　solution　with　the　leaching　residue,　after　preparing　the　particle　by　use　of　the　leaching　residue　and　studying　on　the　particle's　surface　area　and　bore　structure.　　　　　1.The　particle　has　been　made　by　use　of　the　leaching　residue　,savageness　and　kaolin　as　raw　materials.　The　mass　quality　proportions　are　as　follow:　the　leaching　residue　is　66%,　kaolin　is　21%,vermiculite　is　13%.　The　technology　of　making　particle　is　crushing　and　pressing.　The　particle's　diameter　is　0.45-0.8mm.　The　calcine　temperature　is　820℃　and　the　calcine　time　is　20min.　　　　　2.The　results　show　that　the　particles　have　high　water　adsorption　rate,　large　surface　area　and　connecting　bores.　Ammonia　leaching　reside　particle's　water　adsorption　rate　and　surface　area　are　10.64%　and　18.61　m2/g.　Acid　leaching　reside　particle's　water　adsorption　rate　and　surface　area　are　12.90%　and　35.62　m2/g.　3.　The　experiment　indicates　that　　pH　,　initial　density　and　velocity　of　flow　of　the　solution　also　have　a　remarkable　influence　on　the　results　of　absorbing.　The　larger　is　the　pH,　the　better　is　the　ability　of　adsorption.　When　the　velocity　of　flow　is　slow,　the　results　of　adsorption　are　fine.　When　the　solution　initial　density　is　low,　it　can　purify　much　waste　water.　Ammonia　leaching　residue(3.5g)　absorbs　Cu2+from　the　solution　(　[Cu2+]=13.5mg/L,　the　velocity　of　flow　is　16.67mL/h),when　pH=2.78,the　volume　of　simulation　waster　water　being　purified　is　125　mL;　when　pH=5.35,　the　volume　of　simulation　waster　water　being　purified　is　825mL.　Ammonia　leaching　residue(3.5g)　absorbs　Cu2+from　the　solution(　[Cu2+]=27mg/L,　pH=5.35),when　the　velocity　of　flow　is　16.67mL/h,　the　volume　of　simulation　waster　water　being　purified　is　275　mL;　when　the　velocity　of　flow　is　10mL/h,　the　volume　of　simulation　waster　water　being　purified　is　400　mL.　4.The results show that ammonia leaching residue particle's dynamic adsorption capacity of heavy metal ions is better than acid leaching residue's. Ammonia leaching residue particle has the good adsorption capacity of Cu2+, Cd2+, Pb2+ in aqueous solution. Acid leaching residue particle can only absorb Cu2+ in aqueous solution well. Ammonia leaching residue has the good ability of redox and few ions on its surface, which has something with the results. 　　　　　The experiment indicates that the leaching residue particle has large surface area and bore structure. The leaching residue particle can dynamic purify simulation waste water well. The research may provide experimental foundation for purifying waste water by utilization of oceanic polymetallic nodules and cobalt-rich crusts as environmental materials.