Potassium Sulfate

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potassium sulfate

[pə′tas·ē·əm ′səl‚fāt]
(inorganic chemistry)
K2SO4 Colorless crystals with bitter taste; soluble in water, insoluble in alcohol; melts at 1072°C; used as an analytical reagent, medicine, and fertilizer, and in aluminum and glass manufacture. Also known as salt of Lemery.

Potassium Sulfate


a salt; colorless crystals. Density, 2.66 g/cm3, melting point, 1074°C. Solubility, 11.1 g per 100 g H2O at 20°C (24.1 g at 100°C).

Potassium sulfate is a consituent of natural potassium salts, such as schoenite (K2SO4·MgS04·6H2O), from which it is also extracted. Potassium sulfate is used in the preparation of alum and potash. In agriculture, it serves as a concentrated chlorine-free potassium fertilizer, containing no less than 45–52 percent K2O, no more than 1 percent MgO, and no more than 10 percent moisture; it is applied primarily to the soil under chlorine-sensitive crops (potatoes, tobacco, flax, grapes, citrus fruits). The presence of the sulfate ion in the fertilizer has a favorable effect on the yield of crucifers (cabbage, rutabagas, turnips) and legumes, which require a large amount of sulfur.

Heating potassium sulfate with concentrated sulfuric acid forms the acid salt potassium hydrosulfate (bisulfate): K2SO4 + H2SO4 = 2KHS04. At temperatures above its melting point (210°C), potassium hydrosulfate is converted first to potassium pyrosulfate (2KHS04 = K2S207 + H20) and then to potassium sulfate and sulfuric anhydride (K2S2O7 = K2SO4 + SO3). This reaction is used for converting substances that are nearly insoluble in acids (for example, calcinated A12O3, Fe2O3, Cr03) into soluble sulfates. Potassium hydrosulfate is also used as a flux in metallurgy.

References in periodicals archive ?
Average prices in the potassium sulfate market remain strong, and this had a positive impact on our results.
Treatment of irrigation once per 21 days with foliar application of potassium sulfate at establishment stage and treatment of irrigation once per 21 days with soil +foliar applications at tasselling stage with averages of 172.
The current potassium sulfate market is estimated at 5 million tons per year (over $1 billion).
The company is the largest producer of solar pond potassium sulfate in the world and "low energy costs make us competitive on the world market.
The Section presents data on dynamics of production of potassium sulfate in the world, main producers of the product, as well as data about prices on potassium sulfate.
It also produces specialty plant nutrients, iodine and its derivatives, lithium and its derivatives, potassium chloride, potassium sulfate and certain industrial chemicals (including industrial nitrates and solar salts).
The treatment of potassium sulfate fertilizer factorial experimental plot not included
It was considered that the acid effluent stream could be reacted with potassium sulfate to form potassium jarosite [K[Fe.
The company produces and markets potassium sulfate (also known as sulfate of potash or SOP), salt and magnesium chloride using solar evaporation.
This according to another research report titled Specialty Fertilizers Market by Type (Monoammonium Phosphate, Monopotassium phosphate, Potassium Nitrate, Potassium Chloride, Potassium Sulfate, Urea, UAN, and Others), by Crop Type & by Region - Global Trends & Forecast to 2020.
Nitrogen fertilizer was used from urea source; triple was used from super phosphate from triple super phosphate source and potassium from potassium sulfate source.