1. The dry charcoal is added to the bottom of the crucible of the induction furnace, the crucible is preheated to about 200 ℃, and 1 / 2 of the total amount of tin and all copper are added. When the material is completely melted, add the preheated antimony particles and continuously stir them. After the antimony is completely melted, remove the slag

2. When the remaining tin is added, when the alloy liquid is heated to the pouring temperature, it can be kept at constant temperature for 1 h to make the alloy composition uniform

3. The alloy liquid was stirred and refined with 0.05% - 0.1% anhydrous ammonium chloride. If continuous casting is carried out for a long time, refining can be carried out every 1 h. After standing for a certain period of time, remove the slag and pour.

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