The way hydroxide nickel (ii)
(57) Abstract:The invention relates to the field of production of Nickel compounds, hydroxides, and can be used in the manufacture of alkaline batteries. The method includes obtaining a solution containing Nickel ions and acid balance, the interaction of the resulting solution with an alkali metal hydroxide with subsequent separation of the resulting precipitate and bringing it to the market standard. The initial solution is obtained by interaction of hydrochloric acid, Nickel sulfide and the oxidant. The amount of alkali metal in the reaction mixture after completion of the reaction is 4-10 g/l Drying of the target product are carried out to a moisture content of 20-25%. The technical result - increasing the yield and reducing production costs. The invention relates to the field of production of Nickel compounds, hydroxides, and can be used in the manufacture of alkaline batteries.As a prototype of the selected method hydroxide Nickel (II), including the production of a solution of sulfuric acid Nickel, its interaction with sodium hydroxide, separating the precipitate and subsequent cleaning, drying, grinding, Vysshaya school, 1997, - S. 260-277).The disadvantage of this method is the low yield and the associated high production costs.The task proposed by the invention is to increase the yield of the product and reduce production costs.This is accomplished by the fact that in the method including obtaining a solution containing Nickel ions and acid balance, the interaction of the resulting solution with an alkali metal hydroxide, separating the resulting target product, cleaning and drying, the initial solution is obtained by interaction of hydrochloric acid, Nickel sulfide and the oxidant, the amount of alkali metal hydroxide is chosen so that the quantity of alkali metal hydroxide in the reaction mixture after completion of the reaction was 4-10 g/l, and drying the desired product is carried out until the moisture content of 20-25%, after which the obtained product is washed from chlorine ions and dried to marketable condition.When the value of the quantity of alkali metal hydroxide in the reaction mixture after completion of the reaction obtain the target product of more than 10 g/l basic salts are formed of Nickel chloride, not having an electrochemical capacity, CLASS="ptx2">When the humidity value at the first drying of the target product more than 25% of the formed amorphous phase hydroxide Nickel (II), do not possess the necessary electrochemical properties, and when the humidity value is less than 20% decreases the quality of the interlayer water in the crystal of Nickel hydroxide and reduces its electrochemical capacity.The method is as follows.The addition of sulfide 60 g undergoes dissolution in 200 ml of 36% hydrochloric acid at a temperature of 60oWith the addition of 34.5 g of hydrogen peroxide solution of 30% concentration.The resulting solution of Nickel chloride being filtered from elemental sulfur and undissolved impurities. After filtration, a solution of Nickel chloride is served for 15 min in a solution of alkali content caustic soda 300 g/l with constant stirring. The residual alkali content in the mother solution after the reaction of the hydroxide Nickel (II) is 7%.After filtration hydroxide Nickel (II) from the mother liquor it is subjected to the first drying at a temperature of 110-120oC to a residual moisture content of 23%. After this dried precipitate reporterette in demineralized water and subjected Obdach of hydrocele (II) is subjected to a second drying at a temperature of 100-110oC to a residual moisture content of 7%.The obtained hydroxide Nickel (II) contains 57.5% of Nickel and can be used for the production of alkaline batteries. The way hydroxide Nickel (II), including the production of a solution containing Nickel ions and acid balance, the interaction of the resulting solution with a hydroxide of an alkali metal, cleaning and drying, characterized in that the starting solution is obtained by interaction of hydrochloric acid, Nickel sulfide and the oxidant, the amount of alkali metal hydroxide is chosen so that the amount of alkali metal in the reaction mixture after completion of the reaction was 4-10 g/l, and drying the desired product is carried out until the moisture content of 20-25%, after which the obtained product is washed from chlorine ions and dried to marketable condition.
FIELD: process engineering.
SUBSTANCE: invention relates to device and method of producing compounds by precipitation of solid substances. Proposed device comprises reactor provided with inclined settler. Proposed method comprises mixing initial substances in reactor, precipitation of compounds in reaction zone, partial separation of mother leach from precipitated product in inclined settler, separation of product suspension, its filtration and drying. Invention covers also mixed powder of nickel-cobalt hydroxide with WET-surface of less than 20 m2/g and impact density exceeding 2.4 g/cm3.
EFFECT: suspension with concentration exceeding stoichiometric one.
29 cl, 13 dwg, 5 ex
FIELD: power engineering.
SUBSTANCE: method to produce a composite NiO/C material containing 15-60% NiO and representing crystallites β-NiO evenly distributed on a carbon carrier surface with the average size of 2-5 nm, is based on production of NiO nanoparticles as a result of electrochemical oxidation and destruction of two nickel electrodes in solutions of alkaline metal hydroxides with concentration of 2 mole/l under action of AC current with frequency of 50 Hz at average value of current referred to a unit of electrode surface area making 0.3-1.5 A/cm2, with simultaneous deposition of produced nickel oxide nanoparticles onto the carbon carrier, subsequent filtration of the produced suspension, washing of composite by distilled water and its drying at 80°C for 1 hour.
EFFECT: invention makes it possible to increase quality of produced material due to absence of admixtures and to reduce costs for its production.
SUBSTANCE: invention can be used in chemical industry. The method of producing nickel (II) hydroxide involves treatment of an acidic solution of nickel (II) sulphate in two steps, at the first step with ammonia water to pH 4-4.5, at the second step with sodium hydroxide to pH 11-12. At the second step, the process is carried out by feeding the suspension from the first step into the sodium hydroxide solution. Further, impurities are washed off from the residue in an ascending stream with variable hydrodynamic conditions. The residue is then pressed and dried.
EFFECT: invention increases purity of the product and uniformity of its grain-size distribution.
3 cl, 3 tbl, 3 ex
SUBSTANCE: method of producing ultramicrodispersed nickel oxide powder includes electrolysis in 17 M sodium hydroxide solution under alternating sinusoidal current at 20Hz with nickel electrodes. The process of electrolysis is carried out at temperature of 20-30°C and voltage across the electrodes of 4V.
EFFECT: method for producing ultramicrodispersed nickel oxide powder suitable for use in catalytic production of nanocarbon materials by pyrolysis of hydrocarbons while reducing heating costs and simplifying its cell structure.
SUBSTANCE: method comprises production of the nickel oxide powder from metal nickel electrodes by electrolysis in basic solution of sodium hydroxide. Process is executed at temperature 20-30°C upon simultaneous action on the electrodes of current with frequency 20 Hz. At that electrolysis is performed at asymmetrical alternating current with current density of anode and cathode half cycle 2.5 A/cm2 and 1 A/cm2, respectively, and at action on the electrodes of the ultrasound radiation with frequency from 150 to 300 kHz.
EFFECT: production of ultra-micro-dispersed powder of nickel oxide suitable for use during catalitic production of nano-carbon materials with maximum production of the target product, decreasing of power consumption.
FIELD: electrical engineering.
SUBSTANCE: invention relates to electrical engineering, namely to production of aqueous paste of nickelous hydroxide. As starting material used is alkaline industrial effluents directly from section of producing metal ceramic nickel oxide electrodes containing admixture KOH, K2SO4 and hydrate suspension, which are settled, then suspension is washed and filtered.
EFFECT: invention enables to obtain fine highly active fraction of nickelous hydroxide with simplification of method.
4 cl, 2 ex
SUBSTANCE: invention relates to electrochemical production of active forms of nanoparticles of metal oxides. Electrochemical method of producing nano-sized structures of nickel (II) oxide involves oxidation of anode in ionic liquid in an air atmosphere. Nickel anode and cathode are used. Oxidation is performed at temperature 20-25 °C for 2-20 minutes, with density of direct current of 5-10 mA/cm2 or at constant potential of 2.3-5 V. Ionic liquid is preferably with addition of distilled water or propylene glycol.
EFFECT: invention ensures production of highly ordered nano-sized structures.
4 cl, 5 dwg, 5 ex
SUBSTANCE: invention relates to a method of producing crystalline nanopowders of metals with the size of crystallites of less than ≤ 10 nm and can be used in chemical industry, for production of intermediate products for fine ceramic materials. Synthesis is carried out in a water-organic medium using as sources of metal nitrates, chlorides or acetates. For formation and stabilization of sol used are acetylacetone-alcoholic solutions of N,N-dimethyloctylamine, hexamethylene tetramine or monoethanolamine. As a complexing agent used is acetylacetone. Obtained sol through a jet nozzle is dispersed into liquid nitrogen, where at the cooling rate > 30° cryogranulating takes place. Produced granules are subjected to vacuum-sublimation drying to form a cryo-airgel, which is then annealed at 500 °C in air for 3 hours.
EFFECT: proposed method provides technologically effective and environmentally acceptable method of producing nanocrystalline of metal oxides.
4 cl, 8 dwg, 1 tbl, 6 ex
SUBSTANCE: method of producing nanodispersed metal oxides involves forming a reaction mixture by introducing metal and carbamide nitrates into the aqueous medium in a stoichiometric ratio. The reaction medium is exposed to microwave radiation. The reaction mixture is formed directly in the reaction volume at the following component ratio, wt %: a mixture of nitrate and carbamide 10-20, water - the rest. The exposure to microwave radiation is carried out with open access to the reaction medium in the reaction volume. The intermediate reaction product is dried at a temperature of, at least, 200°C. The dried product is ground to a particle size of not more than 20 nm. During the grinding of the dried product, a hydrophobizing treatment is carried out in parallel with a hydrophobizing mixture consisting of silanes and silicone oligomers taken in the ratio, wt %: silane 17-33, silicone oligomer 67-83.
EFFECT: complete conversion of metal nitrates to oxides having prolonged resistance to agglomeration, increasing the yield of products, excluding the presence of traces of the original components in the products.
4 cl, 6 tbl, 8 ex