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.

目前依然使用的處理方法是在48%濃度的堿液進入濃縮器之前加入蔗糖水溶液，這個方法操作起來比較簡單，而且使用的效果穩定。一般來說，當中加入的蔗糖量是理論量的6~8倍是比較合適的，因為加入的量太少那么就很容易發黑，使用的效果并不好，加入過多，那么會使氫氧化鉀中的碳氧離子的含量增加，不利于后續的工序。48%堿液中含有氯酸根的質量分數一般在0.001 5%~0. 002 0%范圍內。用計量泵將5. 5%的蔗糖水溶液加入到48%堿液管道中與堿溶液進行混合反應，使之在進入蒸發器前將其中大部分的氯酸根干凈，這樣才能更有效地保護后續鎳材設備不被腐蝕，從而降低其中的鎳含量，一般其中的鎳含量只要小于7ppm的時候，顏色就不會發黑，也就不會影響后續的使用。

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.

為了盡可能的發揮蔗糖氯酸根的作用，這個過程中要盡量確保管道過濾網的潔凈，保證糖液有足夠的壓力和流量；除了上述這些，還需要經常利用停車的機會對蔗糖液罐和蔗糖液管線進行清理，干凈罐內和管道中積存的雜物及發酵物。

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.

上面介紹的及時使用氫氧化鉀顏色發黑的解決方法，使用蔗糖溶液可以處理干凈，但是在使用的時候也需要控制加入的含量，避免含量過高。

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.