Potassium hydroxide is widely used in drying, electroplating, and can be used as a chemical raw material for the production of other products, but sometimes it will be found after the production of its black color, which in fact will affect the follow-up effect to a certain extent, and blackening is due to nickel contamination, if in the subsequent processing, so there are other chemical reactions More dangerous, so we need to use sucrose solution to solve the problem of black product color.

目前依然使用的处理方法是在48%浓度的碱液进入浓缩器之前加入蔗糖水溶液，这个方法操作起来比较简单，而且使用的效果稳定。一般来说，当中加入的蔗糖量是理论量的6~8倍是比较合适的，因为加入的量太少那么就很容易发黑，使用的效果并不好，加入过多，那么会使氢氧化钾中的碳氧离子的含量增加，不利于后续的工序。48%碱液中含有氯酸根的质量分数一般在0.001 5%~0. 002 0%范围内。用计量泵将5. 5%的蔗糖水溶液加入到48%碱液管道中与碱溶液进行混合反应，使之在进入蒸发器前将其中大部分的氯酸根干净，这样才能更有效地保护后续镍材设备不被腐蚀，从而降低其中的镍含量，一般其中的镍含量只要小于7ppm的时候，颜色就不会发黑，也就不会影响后续的使用。

At present, the method still used is to add sucrose solution before 48% alkali solution enters the concentrator. This method is simple and stable. Generally speaking, it is more appropriate to add 6-8 times of the theoretical amount of sucrose, because if the amount is too small, it is easy to blacken, and the effect is not good. If too much is added, the content of carbon and oxygen ions in potassium hydroxide will increase, which is not conducive to the follow-up process. The mass fraction of chlorate in 48% alkali solution is generally in the range of 0.001 5% ~ 0.002 0%. Measure the 5 5% sucrose solution is added into the 48% alkali solution pipeline to mix with the alkali solution to remove most of the chlorate before entering the evaporator. In this way, it can effectively protect the subsequent nickel equipment from corrosion and reduce the nickel content in it. Generally, as long as the nickel content is less than 7ppm, the color will not turn black, and it will not affect the follow-up Use of.

为了尽可能的发挥蔗糖氯酸根的作用，这个过程中要尽量确保管道过滤网的洁净，保证糖液有足够的压力和流量；除了上述这些，还需要经常利用停车的机会对蔗糖液罐和蔗糖液管线进行清理，干净罐内和管道中积存的杂物及发酵物。

In order to play the role of sucrose in removing chlorate as much as possible, it is necessary to ensure that the filter screen of the pipeline is clean as much as possible to ensure that the sugar solution has sufficient pressure and flow; in addition to the above, it is also necessary to clean the sucrose tank and the sucrose liquid pipeline regularly by taking advantage of the shutdown to clean up the impurities and fermented substances accumulated in the tank and pipeline.

上面介绍的及时使用氢氧化钾颜色发黑的解决方法，使用蔗糖溶液可以处理干净，但是在使用的时候也需要控制加入的含量，避免含量过高。

The solution of timely use of potassium hydroxide to blacken the color is introduced above. Sucrose solution can be used to clean the solution. However, it is also necessary to control the added content to avoid excessive content.