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废镀锡钢片的脱锡是一个连续生产的过程。即把废镀锡钢片通过装有氢氧化钠或亚硝酸钠的脱锡浸泡槽内进行脱锡。而这些钠盐的浓度比一般的操作要高得多。溶液的温度也比一般操作的温度要高些。由于在较高的氢氧化钠浓度和较高的温度条件下,锡与溶液中的钠盐反应成锡酸钠。并从溶液中沉淀出来,然后在离心过滤机或压滤机上连续地过滤,从而得到锡酸钠。脱过锡的废钢片从脱锡槽中取出后用水洗涤,洗水又返回到脱锡浸泡槽内用于制备溶液。
Tin-free scrap tin is a continuous production process. That is, the scrap tinplate is de-tinned through a de-tinting tank containing sodium hydroxide or sodium nitrite. And the concentration of these sodium salts is much higher than the average operation. The temperature of the solution is also higher than the temperature of normal operation. Due to the higher sodium hydroxide concentration and higher temperature conditions, tin reacts with sodium salt in solution to form sodium stannate. And precipitated from the solution, which was then continuously filtered on a centrifugal filter or a filter press to obtain sodium stannate. The tin off scrap is removed from the tin bath and washed with water. The wash water is returned to the tin removal bath for preparation of the solution.