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What should be the melting point (in ⁰C) of flux used for mixing with aluminium casting?

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What should be the melting point (in ⁰C) of flux used for mixing with aluminium casting?

(a) 440⁰C

(b) 555⁰C

(c) 606⁰C

(d) 660⁰C

I had been asked this question at a job interview.

I need to ask this question from Foundry Fluxes and Refractories in section Foundry Introduction & Materials of Casting-Forming-Welding II

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Correct choice is (d) 660⁰C

The explanation: The melting point for flux to be used for aluminium casting should be approximately 660⁰C. However, the oxidation in aluminum is inevitable but flux is essential to avoid contact of aluminium melt to atmosphere and to get dry dross after skimming process which generally maintains the quality of casting material.

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