Effect of depressants on flotation separation of magnesite from dolomite and calcite

The flotation separation of magnesite from calcium-containing minerals has always been a difficult subject in minerals processing. This work studied the inhibition effects of carboxymethyl cellulose(CMC),sodium lignosulphonate, polyaspartic acid(PASP) and sodium silicate on flotation behaviors of magnesite, dolomite and calcite, providing guidance for the development of reagents in magnesite flotation.The micro-flotation results showed that among these four depressants, sodium silicate presented...     

Extraction separation of germanium with hydroxamic acid HGS98

Ｔｈｅｓｅｐａｒａｔｉｏｎｏｆｇｅｒｍａｎｉｕｍｆｒｏｍａｃｉｄｉｃｌｅａｃｈｌｉｑｕｏｒｓ,ｅｓｐｅｃｉａｌｌｙｉｎｚｉｎｃｐｒｏｄｕｃｔｉｏｎ ,ｈａｓａｔｔｒａｃｔｅｄｇｒｅａｔａｔｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｉｔｓｉｎｃｒｅａｓｉｎｇｌｙｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｉｎ ｄｕｓｔｒｙ,ｓｕｃｈａｓｉｎｆｒａｒｅｄａｎｄｆｉｂｅｒｏｐｔｉｃｓ ,ｃａｔａｌｙｓｔｓａｎｄｓｅｍｉｃｏｎｄｕｃｔｏｒｄｅｖｉｃｅｓ.Ａｔｐｒｅｓｅｎｔ,ｔｈｅｂｅｓｔｗａｙｔｏｒｅｃｏ ｖｅｒｇｅｒｍａｎｉｕｍｉｓｔ…     

Mechanism study on flotation separation of molybdenite from chalcocite using thioglycollic acid as depressant

Effects of collectors(butyl xanthate(BX), O-isopropyl-N-sulfur ethyl carbamate(Z-200) and emulsified kerosene), dereagent(sodium sulfide) and depressant thioglycollic acid(TGA) on the flotation of chalcocite and molybdenite were investigated through flotation. The first principle theory was adopted to understand the difference of their surfaces and reaction between minerals and reagents. Results of flotation tests revealed that selectivity of emulsified kerosene is the best of three collectors in separation of chalcocite and molybdenite, though the others also display excellent collecting properties. Sodium sulfide can effectively remove collectors adsorbed on chalcocite surface, and TGA is an effective depressant of chalcocite at pH 8-9. Through first principle study, molybdenite displays relatively stronger covalence property while bonding interaction between copper atoms in chalcocite enhanced its ionicity. Bonding interaction is weaker in reaction of TGA and molybdenite, so it shows higher hydrophobicity and better flotability. Therefore, TGA is an effective inhibitor in the separation.     

Exploration of amino trimethylene phosphonic acid to eliminate the adverse effect of seawater in molybdenite flotation

In this investigation, a chelating agent of amino trimethylene phosphonic acid (ATMP) was introduced to eliminate the adverse effect of seawater in molybdenite flotation. Microflotation results presented that high flotation recovery of molybdenite was achieved in freshwater using kerosene as the collector, but it was significantly decreased in the presence of seawater when pH > 9.5. Among the main ions in seawater, magnesium and calcium ions played a more detrimental role than others. After the addition of ATMP, molybdenite floatability can restore in seawater. Zeta potential distribution and solution chemistry calculation results illustrated that the decreased molybdenite floatability was attributed to the interaction of positive Mg(OH)_2(s) (major) and CaOH⁺ (minor) components with the molybdenite surface. The magnesium/calcium ions of positive components of Mg(OH)_2(s) and CaOH⁺ interacted with the ionized species of ATMP and then produced ATMP-calcium/magnesium complex, leading to the electrostatic repulsion between molybdenite and ATMP-calcium/magnesium complex that was restoring the molybdenite flotation. Hence, the ATMP can be utilized as an appropriate reagent to improve molybdenite flotation in seawater.