Large-size bath liquid acid cold crystallization treatment device

The invention discloses a large-size bath liquid acid cold crystallization treatment device which comprises bath liquid pre-condensers, bath liquid coolers, crystallizers, sulfuric acid absorbers and waste gas condensers, wherein the bath liquid pre-condensers comprise four stages of the bath liquid pre-condensers which are connected in series; the bath liquid coolers comprise three stages of bath liquid coolers which are connected in series; the crystallizers comprise four stages of crystallizers; the waste gas condensers comprise two stages of waste gas condensers; and the sulfuric acid absorbers are connected with second concentrated sulfuric acid outlets of the two stages of the waste gas condensers. By adopting the large-size bath liquid acid cold crystallization treatment device, the yield of mirabilite is 20 t/h, and thus relatively good economic benefits can be achieved. Moreover, the large-size bath liquid acid cold crystallization treatment device is a crystallization device used in the viscose indu