Potassium chloride is prepared into 250 g/L solution, and a small amount of potassium carbonate is added to remove calcium and magnesium ions. Ammonium bicarbonate is also prepared into a solution of 200g/L with water. Reflux the potassium chloride solution to the ion exchange column to change the sodium resin R-Na into the potassium resin R-K, wash with soft water to remove the residual chloride ions in the gaps between the resins, and after washing, pass the ammonium bicarbonate solution downstream through the resin exchange column to change the resin into ammonium type R-NH4 to obtain a mixed dilute solution of potassium bicarbonate and ammonium bicarbonate. Ammonium bicarbonate is decomposed by primary evaporation, most of the potassium bicarbonate is decomposed into potassium carbonate by secondary evaporation, and the precipitated potassium chloride crystals are cooled. Carbonization of the solution changes potassium carbonate into potassium bicarbonate, and then crystallization, separation, washing and calcination are carried out to obtain the finished product. that

Rna +KCl→ RNA+sodium chloride

R-K+NH4HCO3→R-NH4+KHCO3

2KHCO3→K2CO3+CO2↑+H2O potassium chloride is dissolved, and the concentration reaches 270 ~ 300g/L, and appropriate potassium carbonate and potassium hydroxide are added to remove calcium and magnesium ions. After the solution is clarified, it is adjusted to pH 8 ~ 10 with hydrochloric acid, and electrolyzed at a cell voltage of 2.8 ~ 3.5v and a cell temperature of 60 ~ 70℃ with a concentration of 6550. The concentrated alkali liquor is diluted to about 44% and pre-carbonized. When the concentration of potassium hydroxide reaches below 30 g/L, the magnesium hydroxide precipitate is removed by filtration, and then concentrated to remove sodium, then carbonized to obtain crude potassium carbonate, then carbonized to obtain potassium bicarbonate crystals, and then washed with water, centrifugally separated and calcined to obtain refined potassium carbonate products. that

2KCl+2H2O[ electrolysis] → 2koh+Cl2 =+H2 =

2KOH+CO2→K2CO3+H2O

K2CO3+CO2+H2O→2KHCO3

2KHCO3→K2CO3+CO2↑+H2O Mix potassium sulfate, pulverized coal and limestone in a certain proportion, and add water to stir. Wherein potassium chloride is controlled at 6%-8%, sodium salt is controlled at 8%- 10%, and then baked at 900- 1000℃ to obtain black ash.

After the black ash is crushed, it is leached with hot water, and some unconverted potassium sulfate is evaporated and precipitated through the leaching solution, and the separated clear liquid is sent to a carbonization tower for pre-carbonization. Potassium permanganate is added to the carbonization solution to precipitate impurities such as aluminum, silicon and iron, and the filtrate is evaporated until potassium carbonate, sodium double salt and impurities are precipitated. The clear liquid is carbonized for the second time to obtain crude potassium carbonate crystals, which are filtered and washed with water, and then calcined in a calciner at 500-600℃ to obtain a finished product of potassium carbonate. that

K2SO4+2C+CaCO3→K2CO3+CaS+2CO2↑

K2CO3+CO2+H2O→2KHCO3

2KHCO3→K2CO3+CO2↑+H2O

Uses of Potassium Carbonate: Potassium Carbonate is one of the important basic inorganic chemicals, medicine and light industry raw materials, which is mainly used to produce optical glass, welding electrodes, electron tubes, TV picture tubes, light bulbs, printing and dyeing, dyes, inks, photographic drugs, sodium silicate, polyester, explosives, electroplating, tanning, ceramics, building materials, crystals, potassium soap and medicines. Used as gas adsorbent, dry powder fire extinguishing agent and rubber antioxidant. And can also be use for removing carbon dioxide from synthetic gas of chemical fertilize. It can also be used as potash fertilizer. With the continuous development of high technology, the application of potassium carbonate in washing AIDS, monosodium glutamate, food and other fields is also expanding. Inorganic industry is used to manufacture potassium sodium tartrate, potassium aluminum fluoride, potassium thiocyanate and titanium dioxide. Pharmaceutical industry is used to manufacture long-acting sulfonamides, progesterone, cortisone, acetaminophen, estradiol benzoate and other drugs. Glass-lined industry is used to prepare enamel powder to enhance its leveling property, and add it to glass to help melt and improve the transparency and refractive index of glass. Dye industry is used to make Indanthrene, Disperse Red 3B, Reduced Grey M, etc. Dyeing and printing industry is used for vat dyeing and bleaching in ice dyeing. Rubber industry is used to manufacture 40 10 antioxidant. Wool, linen and cotton industries are used for scouring cotton cloth and degreasing wool.

Implementation standard of heavy potassium carbonate: HG/T2522-93

Implementation standard of potassium carbonate: GB/T 1587-2000 refers to first-class products, with K2CO3 ≥ 99.0% (wt) and 99.0% (wt). KCl ≤ 0.01%0.03% K2SO4 ≤ 0.01%0.04% Fe ≤ 0.001%0.002% water insoluble ≤ 0.02% 0.03% ignition vector ≤ 0.60% 0.80.