Method for producing edible salt from sea water through industrial process and processing device of edible salt

工业法海水生产食用盐工艺及加工设备

Abstract

本发明公开了工业法海水生产食用盐工艺及加工设备,该工艺包括海水提取步骤、预处理步骤、浓缩步骤、预热步骤、浓缩结晶步骤,加工设备包括按顺序设置的预处理单元、反渗透机组、预热器、机械式蒸汽再压缩蒸发设备、后处理单元。本工艺与盐田法相比,节省了大量的土地,而且不受季节影响,投资少,节省人力。按年产5万吨食盐为例,盐田法占地近2500亩,而此法仅需50亩。所需人员只有盐田法的1/10,生产每吨盐的基本投资,仅为盐田法的1/5,卤水的纯度和浓度均比盐田法高。结晶后的苦卤可提取硫酸钙、硫酸镁、氯化钾、氯化钙、溴水等重要化工原料,设备运行所需能源都是清洁能源“电能”,自动化程度高,24小时不间断连续生产,无需蒸汽,真正做到零排放零污染。
The invention discloses a method for producing edible salt from sea water through an industrial process and a processing device of the edible salt. The method for producing edible salt from sea water through the industrial process comprises the following steps: extracting seawater, preprocessing, concentrating, preheating, concentrating and crystallizing. The processing device of the edible salt comprises a preprocessing unit, a reverse osmosis unit, a pre-heater, a mechanical steam recompression evaporation device and a post-processing unit. Compared with the salt pan method, the method has the advantages that the large quantity of soil is saved; meanwhile, the influence of season is avoided, the investment is low and the labor is saved. By taking annual output of 50000 tons of edible salt as an example, an area of nearly 2500 acres is occupied in the salt pan method, but an area of only 50 acres is occupied in the method; the number of the required persons in the method is only 1/10 that of the required persons in the salt pan method; the basic investment for producing every ton of salt through the method is only 1/5 that of the salt pan method; the purity and the concentration of brine of the method are higher than those of the salt pan method; important chemical raw materials such as calcium sulfate, magnesium sulfate, potassium chloride, calcium chloride and bromine water can be extracted from the crystallized bittern; the energy needed for operation of the device is clean energy which is electric energy; the device is high in degree of automation, capable of continuously producing the salt in 24 hours, free of steam and really emission-free and pollution-free.

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