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.

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Table 2 shows the removal of irrigation in the stage of maturity Potassium sulfate fertilizer without the use of superabsorbent polymer decreases to 776 kg per hectare of irrigated twice removed Reduction in grain yield was 1921 kg per hectare.
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.
It was considered that the acid effluent stream could be reacted with potassium sulfate to form potassium jarosite [K[Fe.