Potash salts

With sodium nitrate, calcium superphosphate, and potash salts. 

Potash salt mining, 20 613-614 Potassium (K), 20 597-608. See also NaK entries KBr disks Organopotassium compounds... 

Fertilizer balance is also reported to influence the severity of blast (Piricularia oryzae Catt.) and brown spot (H. oryzae) (21-23, 26). Nitrogenous fertilizer increases the severity of blast, whereas potash salts appear to increase resistance. Potash salts are also reported to increase resistance to brown spot. 

In the Tertiary, basaltic dykes intruded the evaporite. Small flakes of newly formed clay minerals cover the basalt surface at the contact with the evaporite. In the underground mines, the basalt is exposed as subvertical dykes, which can be followed horizontally over several kilometres. All basalt-salt contacts discussed here are located in underground mines in the two potash salt horizons mentioned above. 

The dyke is conserved as an isolated tectonic boudin embedded in potash salt. 

I I Potash salt, metamorphosed near basalt contact... 

Uses Of the Stassfurt salts.—The magnesium compounds in the Stassfurt salts are used for the preparation of magnesium and of its salts. The potash salts are an essential constituent of many fertilizers used in agriculture, etc. 22 and potassium chloride is the starting-point for the manufacture of the many different kinds of potassium salts used in commerce—carbonate, hydroxide, nitrate, chlorate, chromate, alum, ferrocyanide, cyanide, iodide, bromide, etc. Chlorine and bromine are extracted by electrolysis and other processes from the mother liquids obtained in the purification of the potash salts. Boric acid and borax are prepared from boracite. Caesium and rubidium are recovered from the crude carnallite and sylvite. 

Raw brine Cone, liquor. Mother liquor Crude potash salts... 

Wood ashes.—The ash of wood, not coal, contains about 30 per cent, of potassium carbonate. Prior to the exploitation of the Stassfurt salts about the middle of the nineteenth century, the chief source of potash was wood ashes, and the process is still used in certain localities where wood-fuel is employed and where much waste wood is available—e.g. in some parts of Canada, United States, Russia, Spain, etc. The ash of trees, hedge-cuttings, sawdust, etc., can be made to yield potash.5 In the Caucasus, the sunflower is grown on waste land for the sake of its seed. The stalks, leaves, etc., are a by-product and are burnt the ash is used as a source of potash. Nearly 7000 tons per annum of crude potash from this source were exported from Novorossik in Russia. The residues in the manufacture of olive oil and almond shells are also stated by G. l Abate to be exceptionally rich in potash salts F. W. F. Day claims that the roots of the water hyacinth (eiehornia crassipes) have... 

In their study The production of available potash from the natural silicates, A. S. Cushman and G. W. Coggleshall reviewed the methods which have been proposed for extracting water-soluble potash salts from natural silicates. These may be arranged in three groups. There is a dreadful monotony in various patents, for in spite of their great number, very rarely does a novel principle appear which offers any promise of success. 

It is used as a source of potash salts. Potassium chloride was called by the early chemists sal digestivus Sylvii, whence the name of the mineral. 

Bromine is produced from seawater, in which bromine occurs in concentrations of 60 to 70 ppm, and from natural brine, where the concentration of bromine may be as high as 1300 ppm. It can also be produced from waste liquors resulting from the extraction of potash salts from carnallite deposits. 

Synonyms Carbonate of potash, Pearl ash, Potash, Salt of tartar, Salt of wormwood, Subcarbonate of potash. 

Medium (e.g. 20-50 X 103 lb/in.2) 4-8 Synthetic resins, plastics, PVC, ammonium chloride, DMT (dimethylterephthalate), inorganic salts, animal feed stuffs Ferrous alloys (in powder form), fluorspar, nickel powder, molybdenum powder Iron, potash salts, glass-maker s sand blends... 

A typical product contains 28-30 percent P205, nearly all soluble in neutral or alkaline ammonium citrate solution. The product is applied in a powdered form or granulated with potash salts. Some grades are produced containing magnesium or boron, which are added during granulation as kieserite or borax, respectively. 

Sulfate of potash (K2S04), unlike the earlier-discussed potash salts, does not occur as natural deposits. It can be recovered by fractional crystallization from such natural brines as those of the Great Salt Lake in Utah and Searles Lake in California. Here separation and recovery are achieved by solar evaporation in shallow ponds. These processes can be utilized only where a suitable brine source is available, and where solar evaporation rates are high. 

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