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 ?
In addition, when applied in the form of [K.sub.2]S[O.sub.4], potassium promotes supply of sulfur and, after potassium sulfate dissociation, part of the S[O.sub.4]2- binds to sodium ions, promoting their movement in subsurface in the soil, with the irrigation events.
Seed yield in soil application of potassium sulfate and also soil application with foliar application at both stages of establishment and tasselling had the highest amounts and treatment of foliar application at both stages of establishment and tasselling had the lowest seed yield (Table 4).
Potassium sulfate is an excellent source of K and S for plants, and boasts the lowest salt index of conventional potash fertilizers.
The MHD steam combined-cycle power plant concept has a built-in SO[sub.2] control system in that the potassium added for conductivity purposes chemically combines with the sulfur to form potassium sulfate, which condenses out as a solid, primarily in the ESP or baghouse.
Butts said the company currently produces one million tons of salt annually; 210,000 tons of potassium sulfate; 25,000 tons of sodium sulfate, with a capacity to produce up to 100,000 tons pending a market; and 10,000 tons of magnesium chloride.
Potassium sulfate ([K.sub.2]S[O.sub.4]) has salt index per unit of [K.sub.2]O of approximately half (46) the salt index of potassium chloride (KCl) (116), which makes it more indicated for soils prone to salinization.
Contract notice: Fertilizer foliar potassium sulfate k-leaf or equivalent.
The treatment of potassium sulfate fertilizer factorial experimental plot not included
Two tenders for the supply of (a) 100 tons potassium chloride, 30 tons potassium sulfate, 5 tons magnesium oxide, 300 tons urea 46 % & 300 tons mono ammonium phosphate.
Producer and marketer of potassium sulfate, salt and magnesium chloride and subsidiary of Compass Minerals (NYSE:CMP), Great Salt Lake Minerals Corp will increase all sulfate of potash specialty fertiliser products' price by USD50 per short ton on orders placed or shipped on or after 1 April 2011 or as contracts allow, it revealed on Thursday.
The jarosite was synthesised using pressure hydrolysis of a solution of ferric sulfate and potassium sulfate. The alunite came from an evaporite deposit at Lake Chandler in Western Australia, and the NaCl impurity was removed by washing.
These projects included two full-scale demonstrations of a limestone wet scrubber that produces gypsum as the end product, and a unique kiln-dust wet scrubber that produces potassium sulfate and distilled water as byproducts.