Sugar cane juice sulfur-free clarification and desalination system and method

Abstract

The invention belongs to the field of sugar industry, and discloses a sugar cane juicesulfur-free clarification and desalination system and method. The system includes a sugar canejuice floating device, a floating juice evaporation device, an adsorption device, an electrodialysis desalination device, an eluent evaporation deviceand a compound fertilizer preparation device. After adding lime milk and phosphoric acid to the sugar cane juice, the juice is separated by the sugar cane juice floating device to obtain a floating clear juice and a scum; the obtained floating clear juice is concentrated by evaporation to 25-45 degree Bx to obtain a crude syrupwhich is then subjected to macroporous resin absorption treatment and electrodialysis desalination treatment to obtain the clear syrup and aconcentrate; the obtained scum and concentrate are mixed to prepare a compound fertilizer;macroporous resin is eluted with the ethanol to obtain an eluate, and the eluate is concentrated by evaporation to obtain a pigment. The system has no carbonation saturation and sulfuric acid neutralization device, does not produce calcium carbonate alkaline filter mud, does not use SO2,can achieve full resource utilization of wasteand has remarkable environmental protection benefits, economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the field of sugar industry, and in particular relates to a sulfur-free clarification and desalination system and method for sugarcane juice. Background technique [0002] At present, the sugar industry basically adopts two processes to produce farmland white sugar, that is, carbonic acid method and sulfurous acid method. The carbonic acid method produces a large amount of alkaline (8.0<pH<11) solid waste-filter mud (the ratio of wet filter mud to raw material is about 5-10%), which pollutes the environment due to difficult treatment and large discharge volume. limit its application. Sulfurous acid sugar production process: due to the unstable reductive bleaching effect of sulfurous acid on pigments, the sugar will return to color after long storage, the content of ash and insoluble impurities is high, and the sulfur content of the product is above 20mg / kg (the national standard GB317-2006 stipulates The sulfur content ...

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Problems solved by technology

The more advanced cleaning methods of sugar liquid include membrane separation method and ion exchange method. Membrane separation method has many problems of membrane material and membrane attenuation, so far it has not been applied in sugar factories with low product added value. There are many applications and promotions in factories, and advanced ion exchange equipment has also been introduced in China, but there are problems such as high material quality requirements and complicated operations, and domestic sugar refineries have not been able to promote them.

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