SU1333639A1 - Method of producing basic zinc carbonate - Google Patents

Abstract

The invention relates to the field of production of basic zinc carbonate from salt solutions, which can be used, for example, in rubber industry as a filler, in the paint industry as an additive in paint and varnish compositions. The invention makes it possible to reduce the content of water-soluble impurities and reduce the consumption of the precipitator. In a reactor with a mechanical stirrer, water is charged in which the seed of basic zinc carbonate is suspended (2-5% of the amount of zinc salt). Then, a 10% zinc sulphate solution and a 20% precipitating solution (5-1 p% excess with respect to stoichiometric) are added to this suspension with stirring. After precipitation is complete, the mixture is stirred. The precipitate introduced is filtered off, washed with distilled water and dried. Get basic zinc carbonate (yield 96%). The content of water-soluble impurities in the product is not more than 0.2 wt.%. 1 hp f-ly, 3 tab. a (Q (O co oa co a co

Description

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The invention relates to the production of basic carbonate carbon from salt solutions, which can be used, for example, in the rubber industry as a filler in the paint industry as an additive in paint and varnish compositions.

The aim of the invention is to reduce the content of water-soluble impurities in the product and to reduce the race of alkali metal or ammonium carbonate.

Example. 50 ml of water are loaded into a reactor with a mechanical stirrer, in which 3.0 g (3.4% of the amount of zinc sulphate) of the basic zinc carbonate is suspended. Then, 795 MP of a 10% zinc sulphate solution and 320 ml of a 17% ammonium bicarbonate solution (10% excess relative to stoichiometric) are added simultaneously to this suspension with stirring for 2 hours at 25 ° C. After precipitation is complete, the mixture is stirred for 30 minutes. The precipitate formed is filtered off, washed three times with repulping 350 mp of distilled water and dried for 3 hours. 57.6 g of basic zinc carbonate are obtained (yield 96%).

Table 1 shows the comparative data obtained by the proposed and known methods. Main credit card

11 II

Sulfate

Chloride

Nitrate

Sulphate chloride

Nitrate sulfate

Prototype

Same II

92

Zinc bonate, KOToimro snowbugs are listed in Table 1, prepared with a 7% excess of precipitant.

Table 2 shows the yield of the product, obtained when the content of the seed in an aqueous suspension of 5 wt.% By weight of zinc salts.

Table 3 shows the effect of the order of introduction of the reactants. Examples carried out with the content of the seed 2 wt.% By weight of zinc salts.

Claims (2)

1. Method of obtaining basic zinc carbonate, including the interaction of a solution of zinc salt with a solution of alkali metal carbonate or ammonium, separating, washing and drying the obtained precipitate, about t l i-. that in order to reduce the content of water-soluble impurities in the product and reduce consumption of carbonate of an alkali metal or ammonium, the interaction of the initial reagents is carried out while simultaneously introducing them into an aqueous suspension containing basic zinc carbonate in an amount of 2-5 wt.% of the amount of zinc salt. 2. Method POP1, characterized in that an alkali metal or ammonium carbonate is used in an amount of 105-110% by weight of stoichio metrics Table 1 0.16 0.2 0.15 0.14 0.12 0.17 0.39 0.14 0.27 Precipitator Excess precipitator,% The content of water-soluble impurities,% 0.35 The yield of the target product,% Table3 0.32 0.43 0.16