I need to prepare a homogenized binary salt mixture from 2 salts. For getting a homogenized salt mixture, I need to heat above the melting point of the salts (about 350 °C). Can anybody suggest some easy way of doing the same at a small scale (about 10 kg)?
It would really depend on what you're melting.
Generally speaking, you would want to pre-mix the dry precursors as much as possible, by grinding them in a ball mill for example. At this point, you might be able to get them to melt at a lower temperature than either melting point due to formation of a eutectic at the interface of the salt crystals, or the lower melting salt acting as a flux.
Use a vessel that is compatible with the salts: some ceramics or glazes can dissolve in your melt, and some metals can react and form salts of their own, which can then be soluble themselves.
For 350 oC most lab ovens should be sufficient. Since a typical lab oven doesn't usually accommodate 10 kg batches, you could try a thermally insulated (fiberglass piping insulation should work) metal vessel over a gas burner. In the latter case, mind the temperature gradients and hot spots, which may or may not be an issue, depending on what you're melting.
Do you want a homogenized liquid or solid mixture? If you want to have a liquid mixture, follow Pavel's advice, and do not forget to stir!
If you want to have a solid mixture, you should be aware that the components of the mixture are likely to separate to some extent upon crystallization. The resulting solid will probably have not a homogenous composition, and you will have to grind and mechanically mix it.
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