Abstract: Borax was produced from tincal ore by water immersion-cooling crystallization method.Influences of leaching temperature，liquid-solid ratio，leaching time，crystallization temperature，and crystallization time on leaching and crystallization were investigated.The optimal process conditions were as follows: leaching temperature was 60 ℃，liquid-solid volumic mass ratio was 2 mL/g，leaching time was 30 min，crystallization temperature was at 0～10 ℃，and crystallization time was 6 h.Under these conditions，boron leaching rate and borax crystallizing rate were more than 98% and nearly 94%，respectively，with the recovery ratio of boron about 92%.The as-prepared borax products had a low impurity， which exceeded the first grade standard requirements of Industrial Disodium Tetraborate Decahydrate，GB/T 537—2009.

Key words: tincal ore, borax, water immersion, cooling crystallization