Interaction between typical anions/cations and structural differences in crystal structure of magnesite in flotation systems - Details

author：

Zhao, Weixuan (Zhao, Weixuan.) ^[1] | Ma, Yingqiang (Ma, Yingqiang.) ^[2] (Scholars：马英强) | Meng, Di (Meng, Di.) ^[3] | Hu, Wenjihao (Hu, Wenjihao.) ^[4]

Indexed by：

EI Scopus PKU CSCD

Abstract：

Magnesite　in　nature　mainly　exists　in　two　structures,　crystalline　and　cryptocrystalline.　The　difference　in　crystal　structure　causes　minerals　to　exhibit　different　surface　properties,　such　as　solubility　and　hydrophobicity,　during　the　flotation　process.　In　the　flotation　process,　the　commonly　used　anion　and　cation　regulators　will　promote　different　interactions　between　the　two　crystalline　structures　magnesite　and　the　collector,　but　the　specific　influence　mechanism　on　the　two　crystal　structures　is　not　clear.　In　this　paper,　the　effects　of　anions　and　cations,　such　as　Fe3+,　Ca2+　,　SiO23-　and　CO23-,　on　the　floatability　of　two　crystalline　magnesites　were　studied　under　the　action　of　dodecamine　cation　collector　and　sodium　oleate　anion　collector.　The　results　show　that　Fe3+　has　obvious　inhibitory　effect　on　minerals　in　dodecamine　system,　the　recovery　rates　of　crystalline　magnesite　and　cryptocrystalline　magnesite　decrease　by　70%　and　10%,　respectively.　Ca2+,　SiO23-　and　CO23-　have　certainly　activating　effects,　among　which　CO23-　has　the　strongest　effect,　and　the　recovery　rates　of　two　crystalline　magnesites　increases　by　70%　and　40%,　respectively.　In　the　sodium　oleate　system,　Fe3+　and　Ca2+　have　inhibitory　effects　on　the　flotation　of　minerals,　the　recovery　rates　of　the　two　minerals　decreases　by　55%　and　20%,　respectively,　when　Fe3+　is　reacted.　Ca2+　and　Mg2+　have　the　activating　effect　on　the　surface　of　minerals,　and　the　recovery　rates　of　crystalline　and　cryptocrystalline　magnesite　increase　by　10%　and　25%,　respectively.　The　different　crystalline　structures　of　magnesite　affect　its　flotation　characteristics　under　ionic　conditions.　The　addition　of　CO23-　will　promote　the　adsorption　of　sodium　oleate　on　the　surface　of　the　mineral,　thereby　improve　the　recovery　rates　of　the　minerals.　The　addition　of　Fe3+　will　promote　the　dissolution　of　magnesite　and　form　a　hydration　layer　on　the　surface　of　the　particles,　hinder　the　adsorption　of　collectors　on　the　surface　of　the　particles,　thereby　reduce　the　recovery　rates　of　minerals.　©　2024　Central　South　University　of　Technology.　All　rights　reserved.

Keyword：

Chemical activation Crystal structure Flotation Magnesite Negative ions Positive ions Sodium

Community：

[ 1 ] [Zhao, Weixuan]School of Minerals Processing and Bioengineering, Central South University, Changsha; 410083, China
[ 2 ] [Ma, Yingqiang]Zijin School of Geology and Mining, Fuzhou University, Fuzhou; 350108, China
[ 3 ] [Meng, Di]School of Metallurgy and Environment, Central South University, Changsha; 410083, China
[ 4 ] [Hu, Wenjihao]School of Minerals Processing and Bioengineering, Central South University, Changsha; 410083, China