The present invention provides a method for using a new liquid fertilizer comprising potassium from a potassium source selected from the group consisting of potassium acetate, potassium formate, potassium citrate, potassium succinate, potassium propionate, potassium phosphate, organic sources of potassium, animal manure, and combinations thereof, and having a slightly alkaline pH and relatively low salt index compared to other sources of potassium for liquid fertilizer products. The fertilizer composition may further comprise additives such as sulfur, zinc, boron, calcium, manganese, iron, copper, cobalt, magnesium, or a combination thereof.

Environmentally-friendly high potassium-content liquid fertilizer and uses for the fertilizer

Valuable substances are recovered from a spent electroless nickel plating solution containing a water-soluble nickel salt, organic complexing agent, hypophosphite, phosphite, and alkali metal ion by adding oxalic acid to the plating solution for causing a nickel ion to precipitate as nickel oxalate for removal and recovery; optionally adding a sulfide to the plating solution for causing a heavy metal ion to precipitate as a heavy metal sulfide for removal; adding a mineral acid and calcium oxide, calcium hydroxide, calcium carbonate, calcium sulfate, calcium chloride or a calcium salt of organic acid to the plating solution from which the nickel ion has been removed; firing solids of the solution in air for converting the alkali metal ion into an alkali metal salt of mineral acid, converting phosphorus into hydroxyapatite, and pyrolyzing off the organic material; and pouring a solid mixture of the alkali metal salt of mineral acid and hydroxyapatite into water for dissolving the alkali metal salt of mineral acid in water for separate recovery of hydroxyapatite and the alkali metal salt of mineral acid.

Zajtsev Valentin A

Papers

Method for treatment phosphorous production waste materials

Method of recovering waste of sodium hypophosphite production