Danafloat 271 is an aqueous solution of dialkyl dithiophosphate and mercaptobenzothiazole.

Danafloat 271 has little or no frothing properties. It requires a longer conditioning time than do xanthates and for this reason is usually added to a conditioning step or in some instances to the grinding mill.

Danafloat 271 is a stronger collector than Danafloat 371. It is an excellent collector for tarnished or rapidly oxidizing ores, which are normally difficult-to-float ores. Danafloat 271 has found application in the flotation of liberated gold, partly free and partly associated with pyrite and arsenopyrite. It is rated an excellent collector in the flotation of auriferous pyrite, particularly in acid circuits. The collector floats oxidized galena well, but has a quite strong effect on sphalerite and should therefore be used with great care. Danafloat 271 should be considered as a sphalerite collector in any screening test programme. It is also an excellent collector in the flotation of copper and nickel. In many instances a scavenger collector, e.g. xanthate, is used for optimum recovery. Danafloat 271 should be considered as co-collector in the flotation of copper ores, particularly if part of the copper is oxidized or tarnished.

Danafloat 271 can be added undiluted or preferably diluted with clear water to 5-20% solutions. It is good practice to stir before use.

The dosage of Danafloat 271 varies with the type of ore, usually falling in the range of 10 to 100 grams per metric ton ore.

Experience has shown that Danafloat 271 is effective in the pH range of 3-12.

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Composition

Chemical name: i-butyl-dtp-Na and MBTNa
CAS name: Phosphorodithioic acid, O,O-bis(2-methyl-propyl)ester, sodium salt
Active ingredient: 10-12% and 21-24% by weight respectively

Physical properties

Appearance: Yellow to brown
Form: Liquid (aqueous solution)
Boiling point: –
Melting/freezing point: –
Specific gravity: 1.14 g/ml
Flash point: Above 65 degrees C