In the technique process of algin the method of dewatering alginic acid and its effect have great influence upon the quality of the alginic acid and the economic profit of its production.The screw press, which is introduced in this paper,has certain advantages, such as suitability and originality in comparasion with other domestic or foriegn analogies. Apart from being used in algin production, the screw press also can be applied to some other industrial treatment, such as papermaking, food process and sewage disposal.
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