Five forms of action of flotation agent xanthate on mineral surface

These forms can be expressed by the following formula:

nROCSS-+MN+ →(ROCSS)nM↓

Or nX-+MN+ →MXn↓

Wherein, MN + for the positive divalent metal ions, in Figure 6-20 to M represents a metal cation, X- is an anion xanthate. Excess xanthate anion also causes the metallocate precipitate to dissolve and form complex cations. Such as

MX2+2X-=MX42-

Excessive metal ions will dissolve the metal xanthate to form complex cations, such as

MX2+M2+ → 2MX+

When a metal forms a 1:1 complex ion with xanthogen [such as PbX+, Figure 6-19(e)], a larger contact angle can be formed. The role of xanthate on the mineral surface, in addition to the formation of metalloate, can also produce dihuang medicine on many mineral surfaces. For example, the following electrochemical reaction to form bis xanthate (ROCSS) 2 xanthate anions and oxygen occurs at the surface of the iron ore.

Anode area 2ROCSS- →(ROCSS)2+2e

Cathode zone 1/2O2 (adsorption) + H2O + 2e → 2OH-

When yellow iron is used to collect pyrite, the main role of hydrophobicity is the double xanthate produced by the above reaction. This is the xanthate collectors iron ore and xanthate recipient of lead ore different places.

Potassium ethyl xanthate generating metal double salt mineral galena yellow spot with copper ore, potassium ethyl xanthate and dixanthogen generated as mineral pyrite, arsenopyrite, pyrrhotite Mine, chalcopyrite, copper blue, etc.

Chemical adsorption and chemical reactions are the main forms of action of xanthate and sulfide minerals. The adsorption of xanthate on the surface of the chalcopyrite is very strong. It has been proved to be a chemical adsorption or chemical reaction. The role of xanthate on the surface of malachite may be physical adsorption.

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