International name: Potassium Sulphate

Synonyms: potassium sulphate, potassium fertilizer

Chemical formula: K2SO4

Appearance: colorless diamond-shaped crystals

Production: Sweden, Belgium, Poland

Packaging and storage: bag 25 kg; up to 3 years


Potassium sulphate is a highly concentrated, chlorine-free fertilizer, a fine-grained white powder with a yellow tinge, contains 46-50% K2O. It is applied on all soils and under all crops, especially under the sensitive to chlorine (tobacco, citrus, grapes, potatoes and others). It can act as a sulfur-containing fertilizer, but due to limited use in agriculture in providing soil, sulfur plays a small role. Its composition includes about 50% of the macroelement of potassium and oxygen, as well as a small percentage of sulfur oxide, calcium, sodium, iron oxide, which are extremely important for the harmonious growth of plants; but they are so small in composition that they can not be taken into account when using other types of fertilizers. Mineral forms of pure K2SO4 are relatively small. If you talk about how to get a fertilizer, then you can do it: by industrial methods, which are based on the exchange reactions of various sulfates with KCl (And as a result, the inorganic compound is highly contaminated byproducts). In the laboratory (by displacement from unstable or weak acids, from oxide potassium, from alkali and dilute acid, by oxidation of potassium sulfide, from potassium hydrogen sulphate, from potassium superoxide). heating to a temperature of 600 ° C. oxidizing sulfur with potassium dichromate.


Excellent solubility in water, does not undergo hydrolysis. It does not dissolve in pure ethanol or in concentrated alkali solutions. Has a bitter-salty taste. Crystallized view. The crystals are small, often white or yellow in color. The chemical properties include: Sulfur oxide forms pyrosulfate. It is reduced to sulphide. Like all sulfates, it interacts with soluble barium compounds. As a dibasic acid salt, it forms acid salts. It contains not less than 45-52% K2O, not more than 1% MgO and not more than 10% moisture. It is used primarily for crops that are sensitive to chlorine (potatoes, tobacco, flax, grapes, citrus fruits, etc.). The presence of sulfate ion in fertilizer positively influences the yield of plants of the cruciferous family (cabbage, rutabaga, turnips, etc.) and legumes that consume a lot of sulfur. KHSO4 is also used as a flux in metallurgy.


A two-stage scheme for the production of potassium sulphate with the use of high-performance rotary kilns with a capacity of 40-45 t / h of potassium sulfate was developed. In the first stage of the process, sulfuric acid reacts with a part of the production potassium sulfate to produce tricaly hydrogen sulphate (K3H (SO4) 2 or ZK2SO4 ∙ H2SO4) - dry and crumbly salt, which prevents coating and crystallization of the product on the inner surface of the furnace. In the second stage, the salt is mixed with a stoichiometric amount of potassium chloride and the mixture is calcined in a rotary kiln. As a result of calcination, a finished product is formed-potassium sulfate, part of it is sent to a warehouse, and the other is returned to the first stage of production. The advantage of this method is the relative simplicity of the process, the availability and cheapness of the starting materials, a sufficiently large yield of a useful component (potassium sulfate). Also, as a result of the process, hydrochloric acid is obtained, which is widely used in industry. The resulting potassium sulfate can be transported by all modes of transport in accordance with the rules for the carriage of goods. It does not cake, it is stored in the manufacturer's packaging in covered warehouses. The warranty period of potassium sulphate is three years from the date of manufacture.


The main consumer of potassium sulphate is agriculture. Potassium sulphate is a valuable chlorine free fertilizer. The effectiveness of potassium sulphate is better manifested in poor


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