Method for the production of aqueous nutrient source for macro and micro algae aquaculture farming and nutrient source thus formed. Phosphorous containing rocks are dissolved in at least one mineral acid to yield a solution containing a blend of ions of the minerals included in the rocks and in the acid in a form digestible by the algae and adding carbon in the form of CO 2 , carbonic acid, or carbonate salts. The invention is also directed to a method for feeding an algae aquaculture farm with such nutrient source.

Method for the production of aqueous nutrient source for algae aquaculture farming

FIELD: chemistry.SUBSTANCE: invention can be used in chemical industry. Method of producing aluminium oxide gel involves a first step of depositing aluminium oxide, involving deposition of at least one basic precursor and at least one acidic precursor in an aqueous reaction medium. At least one of precursors - basic or acid - contains aluminium. Relative flow of acidic and basic precursors is selected so that pH of reaction medium is from 8.5 to 10.5. First stage of sedimentation is carried out at 10–50°C for 2–30 minutes. Then, suspension second stage is carried out by adding at least one basic precursor and at least one acidic precursor. Second deposition step is carried out at 40–90 °C for 2–50 minutes. Suspension is heated between the first and second deposition steps and after the second precipitation step. Further, the obtained suspension is thermally treated at 50–200 °C for a period of time of 30 minutes to 5 hours. Filtration step is then carried out with at least one washing step of the obtained gel.EFFECT: invention enables to obtain aluminium oxide gel, characterized by improved filterability.7 cl, 5 tbl, 5 ex

Gel with high degree of dispersibility and method of its production

FIELD: chemistry.SUBSTANCE: invention relates to chemistry. The aluminium hydroxide gel particle has Fe content of 1-10 ppm, sodium oxide content of not more than 0.1 wt % and 0.1 mol/l hydrochloric acid consumption of not less than 250 ml when determined by an antacid force measurement method specified in the 15th Revision of Japanese Pharmacopoeia. The method of producing the aluminium hydroxide gel particle involves adding a chelating agent to aqueous solution of a soluble aluminium salt to form a complex, reacting aqueous solution of a carbonate of an alkali metal or ammonium with the aqueous solution of a soluble aluminium salt at temperature of 10-40°C, separating the solid and liquid phases of the obtained reaction product to obtain a cake, reacting the obtained cake with aqueous solution of at least one ion-exchange agent selected from a group consisting of an inorganic acid and a water-soluble aluminium salt, and drying the cake.EFFECT: invention enables to obtain a product of high purity, which is highly reactive with respect to acid.5 cl, 1 tbl, 7 ex

Grigoreva Rina A

Papers

Method of aluminium hydroxide production

Method of comprehensive processing of apatite-nephelite ores