Potassium sulfate is a kind ofinorganic salt, chemical formula is KtwoSOfour, white crystalline powder.The appearance of agricultural potassium sulfate is mostly light yellowHygroscopicitySmall, not easy to caking, good physical properties, easy to use, good water-soluble potash fertilizer, and chlorine freenitrogen、phosphorus, potassium ternaryCompound fertilizerMain raw materials of.[1]
Chinese name
potassium sulphate[3]
Foreign name
Potassium sulphate Potassium sulfate
chemical formula
KtwoSOfour[3]
molecular weight
one hundred and seventy-four point two five nine[3]
With sulfate typePotash mineAnd potassium salt lakesbrineFor raw materials.98% sulfuric acid andpotassium chlorideThe reaction is carried out at high temperature of 550 ℃ to directly produce potassium sulfateHydrogen chloride, absorb with water, and produce hydrochloric acid as a by-product. This method is the main method for industrial production of potassium sulfate in China, called Mannham method.useAluniteIt is obtained by reduction pyrolysis.
In Germany, potassium sulfate is mainly produced by the liquid phase reaction of magnesium sulfate ore and potassium chloride.
It is prepared by reaction of sulfuric acid and potassium chloride.Mixed sulfuric acid andPotassium hydroxidePotassium sulfate can also be obtained:
HtwoSOfour+ 2KOH = KtwoSOfour+ 2HtwoO
application area
Announce
edit
It is used to manufacture various potassium salts such asPotassium carbonate、Potassium persulfateThe basic raw materials of.Glass industry is used as settling agent.The dye industry is used as an intermediate.Spice industry is used as auxiliary agent.The pharmaceutical industry is also used as a laxative and to treat soluble barium salt poisoning.Potassium sulfate is a commonly used potash fertilizer in agriculture. The content of potassium oxide is 50%, commonly known as "Baikali" in Taiwan.
Calculate chemical data
Announce
edit
1. Drainage parameter calculation reference value (XlogP): 0
Potassium sulfate is a colorless crystal with low hygroscopicity, difficult caking, good physical properties and easy application. It is a very good water-soluble potassium fertilizer.Potassium sulfate is also a chemical neutral, physiological acid fertilizer.Potassium sulfate is a chlorine free, high-quality and efficient potash fertilizer, especially in the planting of chlorine sensitive crops such as tobacco, grapes, sugar beets, tea trees, potatoes, flax and various fruit trees;It is also the main raw material of high-quality nitrogen, phosphorus and potassium ternary compound fertilizer.
Potassium sulfate type compound fertilizer is produced by the process of potassium chloride low-temperature conversion, chemical synthesis, and spray granulation. It has good stability. In addition to the three major nutrients N, P, and K necessary for plants, it also contains S, Ca, Mg, Zn, Fe, Cu, and other trace elements.This kind of fertilizer is suitable for various cash crops, especially for chlorine sensitive crops.The main component of potassium sulfate compound fertilizer is MAP（Monoammonium phosphate）And DAP（Diammonium phosphate）Ammonium sulfate (mainly obtained by neutralizing surplus sulfuric acid converted at low temperature with gaseous ammonia).Potassium sulfateureaAnd other impurities such ascalcium sulfate、phosphoric acidFe, Al, Mg and a small amount of unreacted potassium chloride.
Precautions
First, in acid soil, excess sulfate will make the soil more acidic, and even increase the toxicity of active aluminum and iron in the soil to crops.Under flooding conditions, excessive sulfate will be reduced to generate hydrogen sulfide, which will make the roots black.Therefore, long-term application of potassium sulfate should be combined with farmyard manure, alkaline phosphate fertilizer and lime to reduce acidity. In practice, drainage and field drying measures should also be combined to improve ventilation.
Second, in calcareous soil, sulfate and calcium ions in the soil generate insoluble calcium sulfate (gypsum).Too much calcium sulfate will cause soil hardening, so attention should be paid to increasing farmyard manure.
Third, focus on the use of chlorine resistant crops, such as tobacco, tea trees, grapes, sugar cane, sugar beet, watermelon, potatoes, etc. Adding potassium sulfate not only improves the yield, but also improves the quality.The price of potassium sulfate is more expensive than that of potassium chloride, and the source of goods is less. It should be mainly used for economic crops that are sensitive to chlorine and like sulfur and potassium, and the benefits will be better.
Fourth, this kind of fertilizer is a physiological acid salt, which can reduce the soil PH value in alkaline soil.
