海盐精制工艺过程研究
关键词： 海盐；精制；提纯
The research of refining process for Sea salt
Abstract: Sea salt is versatile, it is an important raw material in chemical industry and the indispensable consumer goods in people's life, and also it is related to national economy and people's livelihood. Now the sea salt market is very competitive due to the situation that production of crude salt in our country have oversupplied. As the requirement of the crude salt quality is increasing day by day, and people pay more attention to the health and life quality, edible salt is required to have higher demand. For the sea salt is one of the necessaries in People's Daily life, therefore, it must meet strict specifications. The quality of high and low has decided the future development of suppliers. For expanding the scale of the enterprise, and even sea salt export, the further improving of sea salt quality cannot be delayed. This article through the comparative study on sea salt refining, selecting rational chemical reagents, reagent formula content range and environment, such as reaction temperature, reaction time, finally get the experiment method accords with national standard of refined salt is prepared, optimization of process conditions.
Key words: sea salt; refine; purification
目 录
1 绪论1
1.1 引言•1
1.2 海盐的应用1
1.2.1 海盐作为工业盐的应用1
1.2.2 海盐作为食用盐的应用2
1.3 我国海盐的现况以及精制盐的国标2
1.3.1 海盐的构成和现况2
1.3.2 精制盐的国标3
2 实验设计•4
2.1 实验的试剂和仪器•4
2.1.1 实验的试剂•4
2.1.2 实验仪器5
2.2海盐精制方法研究•6
2.2.1 温度的控制•6
2.2.2杂质离子的去除8
2.2.3 浓缩过程中的pH值控制11
2.3 实验最终方案的确定11
3 实验数据以及数据处理13
3.1实验室海盐精制过程•13
3.1.1海盐水溶液配制•13
3.1.2硫酸根离子的去除13
3.1.3 过量的钡离子、钙镁离子、铁离子的去除•13
3.1.4 过滤、调pH值13
3.1.5 氯化钠澄清液脱色13
3.1.6 精制氯化钠获取•14
3.2实验结果的讨论与分析•14
3.2.1 水分的测定14
3.2.2 水不溶物的测定•15
3.2.3 氯离子的测定16
3.2.4 硫酸根离子的测定18
3.2.5 钙和镁离子的测定22
4 结果与讨论•27
4.1 实验结论27
4.2 实验有感27
致谢28
参考文献29 ,3765
1 绪论
1.1 引言
盐是人类赖以生存和发展不可缺少的重要物质，是人类生产和生活的必需品。当前，全世界以工业的规模，利用海水生产食盐的国家已达吹冰十多个国家，根据数据，每年从海水中产生的食盐总量达七千多万吨。我国的海盐生产总量一直遥遥领先，居世界各产盐国之首，年产量约在两千万吨左右。海水中含有丰富的盐资源，平均含量是三十五，即每千克海水里含盐三十五克。按此计算，在海水中蕴藏的盐约为五亿亿吨，其中食盐占百分之七十七。可以说，海洋是座取之不尽的盐业供应商。但如今，人们也都有这样的共识，那就是海水本身就是重要的自然资源。合理的利用资源，文持可持续发展是具有重大意义的。
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