Hydrocarbon-based oxoacid (and its salt) collectors - swollen acid, phosphonic acid

Such agents mainly arsenic acid, derivatives of phosphoric acid. For example, mixed tolonic acid, styrenephosphonic acid, and the like.

  

R —

O - ... H +

R —

O - ... H +

/

/

As

P

‖

O - ... H +

‖

O - ... H + is a weak acid, pK a between 2.0 ~ 4.7

O

O

( 1 ) Citrate. There are many kinds of organic swollen acid, and the main use as a collector is a benzoate derivative.
Domestically produced is a mixture of tolonic acid containing o- and p-isomers, as well as benzyl and methylbenzyl sulphonate. Their structural formula is:

Mixed toluene acid is white or light yellow powder, soluble in hot water or alkaline solution, insoluble in cold water, and solubility in water at room temperature is 3% to 5% . Industrial products contain a small amount of arsenic and are toxic. It is stable in acid medium, capable of forming insoluble precipitates with various metal ions. Of toluene were mixed acid swollen cassiterite, wolframite, lead oxide, and rare earth ore mineral collector has effect.
( 2 ) The organic phosphonic acid as the collector is mainly styrene acid, and the structure is:

Styrene phosphonic acid can form poorly soluble salts with Sn 2+ , Sn 4+ , Fe 3+ ions. For Ca 2+ and Mg 2+ ions, the salt can be formed only when the concentration of styrene phosphonic acid is high, so the mineral capture ability of Ca 2+ and Mg 2+ is weak. Pure styrenephosphonic acid is white crystal and soluble in water. Its solubility increases with increasing temperature. Its selectivity is slightly worse than toluic acid, but it is less toxic, non-foaming, and sensitive to temperature. Can be used for flotation of cassiterite, black tungsten ore.
Other phosphonic acids (such as dihydrocarbylphosphonic acid) and phosphonates have also been used as collectors.

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