The main production methods of potassium hydroxide still in use are diaphragm method, mercury electrolysis method and ion-exchange membrane electrolysis method. There are many production methods. Generally, the quality of the production process is evaluated, and the finished product quality, production cost and equipment cost are required. Considering all aspects, we will discuss the production process of mercury electrolysis today.

　　汞電解電解液的制備與隔膜電解的制備相同。 在電解室內，以石墨（或金屬）為陽極，以汞為陰極，將電解產生的氯氣送入氯氣干燥工序，生成的鉀汞齊流入汞冶煉室。  。 大部分氯化鉀沒有反應，在輕鹽水狀態下再次處理后，返回到原料溶解過程。 汞齊鉀與清水反應形成氫氧化鉀和氫。 由于從水銀熔化室產生的濃度為45％?50％，因此可以將其用作液體產品，或者可以將其蒸發成固體基質，或者通過苛性鈉鍋制成片狀產品。

　　The preparation of electrolyte for mercury electrolysis is the same as that of diaphragm electrolysis. In the electrolysis chamber, graphite (or metal) is used as anode and mercury is used as cathode to send the chlorine produced by electrolysis into the chlorine drying process, and the potassium amalgam produced flows into the mercury smelting chamber. Most of the potassium chloride did not react. After being treated again in light brine, it returned to the dissolution process of raw materials. Potassium amalgam reacts with water to form potassium hydroxide and hydrogen. Since the concentration generated from the mercury melting chamber is 45% - 50%, it can be used as a liquid product, or it can be evaporated into a solid matrix, or it can be made into a sheet product through a caustic soda pot.

　　（1）氯化鉀溶液的純化：

　　(1) purification of potassium chloride solution:

　　將原料氯化鉀溶解在鹽浴中，加入碳酸鉀，并去除氯化銫以除去鈣，鎂和硫酸鹽等雜質，然后進入澄清池，上清液溢出，輕微懸浮。 用砂濾器過濾。 物料被送入中和罐，用鹽酸酸化后流入鹽水儲罐，鹽水通過鹽水預熱器泵入鹽水高罐，然后流入汞電解罐。 澄清池底部的鹽泥，然后過濾并回收鹽水，然后排干泥漿。

　　Dissolve the raw material potassium chloride in the salt bath, add potassium carbonate, and remove cesium chloride to remove impurities such as calcium, magnesium and sulfate, and then enter the clarifier. The supernatant overflows and is slightly suspended. Filter with sand filter. The material is sent to the neutralization tank, acidified with hydrochloric acid, and then flows into the brine storage tank. The brine is pumped into the brine high tank through the brine preheater, and then flows into the mercury electrolytic tank. Clear the salt mud at the bottom of the tank, filter and recover the salt water, and then drain the mud.

　　（2）電解：

　　(2) electrolysis:

　　汞電解池分為兩部分，電解室和減壓泵室。 在電解室中，石墨或金屬用作陽極，汞用作陰極。 通電后產生的氯氣被送到氯氣干燥過程，電解鉀泵流入泵室。 大部分未反應的氯化鉀都在淡鹽水狀態下處理：將其返回鹽水工藝。 在泵室中，鉀泵與終水反應形成氫氧化鉀溶液，并流入電解液儲罐。 在泵送室內產生的氫氣被送氫氣輸送站。

　　Mercury electrolysis cell is divided into two parts, electrolysis chamber and pressure reducing pump chamber. In the cell, graphite or metal is used as the anode and mercury as the cathode. The chlorine produced after power on is sent to the chlorine drying process, and the electrolytic potassium pump flows into the pump room. Most of the unreacted potassium chloride is treated in dilute brine: it is returned to the brine process. In the pump chamber, the potassium pump reacts with the final water to form a potassium hydroxide solution and flows into the electrolyte storage tank. The hydrogen generated in the pumping room is sent to the hydrogen transfer station.

　　（3）堅實的基礎：

　　(3) solid foundation:

　　由汞電解池的泵送室產生的含有KOH45-50％的堿液通過釕堿制成固體堿，或通過壓片機理制成產物。

　　The alkaline solution containing 45-50% KOH produced by the pumping chamber of the mercury electrolysis cell is made into solid alkali by ruthenium alkali or into product by tablet pressing mechanism.

　　上面描述了通過汞電解生產氫氧化鉀的生產方法，通常生產液體堿和固體堿，兩者均可使用和出售。

　　The above describes the production method of potassium hydroxide by mercury electrolysis, usually producing liquid alkali and solid alkali, both of which can be used and sold.