( 1 ) Benzothiazole thiol (mercaptobenzothiazole, MBT ). The structural formula is:
It is a yellow powder, insoluble in water, soluble in alcohol, sodium hydroxide or sodium carbonate solution. Its sodium salt is called Capnex and is soluble in water.
Benzthiazole thiol used in the flotation of zinc mineral chabazite, without pre-vulcanization, a xanthate results obtained with sodium sulfide results similar. Collector of lead oxide ore on strong. Sulfide ore flotation, galena collector of the strongest, sphalerite collector capacity is poor, the weakest of brass ore.
When the amount of benzothiazole thiol is high, it often causes the quality of concentrate to decrease. In practice, it is used in combination with xanthate or black medicine.
( 2 ) Benzothiazole thiol ( N -phenyl- 2- mercaptobenzimidazole). The structural formula is:
Imidazole thiol is a white solid powder, hardly soluble in water, benzene and ether, and easily soluble in hot alkali (such as sodium hydroxide, sodium sulfide, etc.) and hot acetic acid. Used for flotation of copper oxide ore (mainly copper silicate and copper carbonate) and refractory copper oxide ore.
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