State the principles of washing crudesalt and test the influence of washing it, so as to find out the suitable conditions of washing.
阐述了原盐洗涤的原理，并对原盐洗涤的影响因素进行试验及讨论，从而找出原盐洗涤的适宜条件。
2
The strong and weak points of two kinds of crudesalt were compared respectively. The economic benefit gained from optimizing the process and equipment was given.
对比了两种原盐的优缺点，列出了优化工艺及设备后所取得的经济效益。
3
Conclusions Prevalence of goiter in IDD areas has already decreased to below 5% through prevention for many years, but the quality of crudesalt in these areas should be improved.