Vacuum refining furnace

1. A vacuum refining furnace, comprising:

a) a furnace body, the furnace body comprising: an evaporation laminate, a plurality of graphite condensing casings, and a graphite insulating casing, and the evaporation laminate comprising a plurality of evaporators;

b) a graphite heater comprising a heating pin;

c) an electrode;

d) a sealed furnace housing;

e) a positioning member; and

f) a connecting base;

wherein

the evaporation laminate is nested within the graphite insulating casing, and the graphite insulating casing comprises a plurality of through holes;

each of the plurality of graphite condensing casings has a different diameter from another one of the plurality of graphite condensing casings; the graphite insulating casing is nested within the graphite condensing casing having a smallest diameter; each graphite condensing casing except for the graphite condensing casing having the largest diameter is nested within one of the graphite condensing casings; and each graphite condensing casing that is nested within one of the graphite condensing casings has a smaller diameter than the one of the graphite condensing casings it is nested within;

all the graphite condensing casings except for the graphite condensing casing having the largest diameter comprise a plurality of through holes;

the heating pin and the connecting base are connected to each other via a graphite bolt;

the positioning member is disposed on the connecting base;

each of the heating pin, the graphite bolt, and the electrode comprises a side surface;

the positioning member comprises a first side surface and a second side surface;

the connecting base comprises a third side surface and a fourth side surface;

an area of the third side surface is substantially the same as an area of the fourth side surface;

the second side surface, the third side surface, and the fourth side surface are substantially parallel to one another;

the first side surface is disposed between the second side surface and the third side surface and is oblique with respect to the second side surface and the third side surface; and

the side surface of the heating pin is in contact with the second side surface of the positioning member, the side surface of the electrode is in contact with the third side surface of the connecting base, and the side surface of the graphite bolt is in contact with the fourth side surface of the connecting base.

2. The furnace of claim 1 , wherein

the furnace body comprises a first graphite condensing cover, a second graphite condensing cover, a graphite feed hopper, a first graphite condensing casing, a second graphite condensing casing, a third graphite condensing casing, and a confluence plate;

the evaporation laminate is disposed on a center of the confluence plate; the diameters of the first graphite condensing casing, the second graphite condensing casing, and the third graphite condensing casing are in ascending order; the graphite insulating casing is nested within the first graphite condensing casing, the first graphite condensing casing is nested within the second graphite condensing casing, and the second graphite condensing casing is nested within the third graphite condensing casing; and

the graphite insulating casing, the first graphite condensing casing, and the second graphite condensing casing are all provided with a plurality of through holes; the first graphite condensing cover is disposed on the third graphite condensing casing; the second graphite condensing cover is disposed on the first graphite condensing casing; the graphite feed hopper passes through the first graphite condensing cover and the second graphite condensing cover and is disposed right above an upper part of the evaporation laminate.

3. The furnace of claim 1 , wherein

the evaporators are in a shape of a disc; an evaporation tank is circumferentially disposed on the evaporators;

one end of the evaporation tank is a front of evaporation tank, and the other end of the evaporation tank is a rear of evaporation tank;

the front of evaporation tank and the rear of evaporation tank are separated by an evaporation tank grate; and

the rear of evaporation tank comprises a material discharge hole.

4. The furnace of claim 1 , wherein an insulating hoop is mounted on a sidewall of each of the evaporators via a supporting ring of the insulating hoop.

5. The furnace of claim 1 , wherein each of a discharge pipe and a residue pipe comprises a graphite liner and a steel casing, the graphite liner is fitted within the steel casing, and a fire-proof filler is filled between the steel casing and the graphite liner for binding.

6. The furnace of claim 1 , wherein

the side surface of the heating pin and the second side surface of the positioning member are bonded by a high temperature conductive filler; and

the graphite heater has a heating power of 450 kW.

7. The furnace of claim 1 , wherein a liquid cooling cavity is disposed inside the electrode, and a liquid inlet and a liquid outlet are disposed on an external of the electrode and communicate with the liquid cooling cavity.

8. The furnace of claim 1 , wherein a stopper member is disposed between the connecting base and the electrode.

9. The furnace of claim 8 , wherein the stopper member is a stopper piece.