SU1433898A1 - Method of purifying aqueous solutions of zinc salts - Google Patents

Abstract

The invention relates to chemical technology of inorganic substances, in particular, to methods for purifying aqueous solutions of zinc salts from heavy metal impurities and may find application in the manufacture of zinc sulfide-based phosphors. The purpose of the invention is to increase the degree of purification of zinc salts. The method is carried out as follows. The solution of zinc salt (sulphate, acetate, chloride) is passed through a chromatographic column filled with a sorbent, which is a synthetic carbon spherical CKCg-3 fraction of 0.315-0.250 V, of zinc form. The purified salt solution contains heavy metal impurities of cobalt, nickel, iron at the LL level. 1 ..% 1 table. (/)

Description

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This invention relates to chemical technology of inorganic substances, in particular:. methods of cleaning solutions of zinc salts from impurities of t-yellow metals, and may find application in the production of zinc sulfide-based phosphors.

The purpose of the invention is to increase the degree of purification of zinc salts.

The method is carried out as follows.

A solution of zinc salt (sulphate, akhata or chloride) on demineralized water is filtered from mechanical impurities and passed through a chromatographic column filled with an adsorbent. Synthetic carbon spherical SKS, -3 fractions 0.315тО, 250 in zinc form, obtained by treating the sorbent with a solution of zinc salt (0.5 mol / l) in static or dynamic mode for 1 hour, are used as a sorbent.

The purified solution is collected in a polyethylene container, the content of heavy metal impurities in the solution is as follows, May,%: iron

..- 6

cobalt nickel

Example 1 Zinc sulfate in the amount of 190 g of HCh grade (iron content 3-10.%) Is dissolved in 300 ml of demineralized water. The resulting solution is filtered through a HCl-cleaned secondary filter (red tape) to remove mechanical impurities and passed through a chromatographic column filled with the SCR-3 adsorbent, fraction 0.315-0.250. The flow rate is 130 ml / h. The result is a zinc sulphate solution with a concentration of 310 g / l according to ZnS04 and a content of heavy metal impurities,%: iron I lO - j cobalt 1-10; nickel blO t By evaporation and crystallization of this solution, ZnS04- is obtained with the content,%: iron, cobalt

nickel 10.

50

Example 2. Acetate dihydrate. Zinc grade analytical grade (iron content 5-10%) in an amount of 140 g is dissolved in 390 ml of demineralized water. The resulting solution is filtered through CE paper; 1st filter to remove impurities and pass through a chromatographic column filled with an adsorbent

SKSO-3 at a rate of 120 ml / h. The result is a solution with a concentration of zinc acetate 260 g / l and the content of impurities,%: iron I-IO; cobalt 1 10 5 nickel 1 - U -,

Example 3. A grade analytical grade zinc sulphate (iron content in the order of 2-10%) in an amount of 250 g is dissolved in 400 ml of demineralized water. The resulting solution is passed through a chromatographic column filled with a synthetic carbon-spherical adsorbent at a rate of 150 ml / h. A solution of zinc sulphate is obtained with a concentration of the basic substance in the order of 310 g / l and an impurity concentration,%: iron. cobalt 1 nickel 1-10 As a result of repeated passage of this solution through a column with a fresh adsorbent, the content of impurities drops to the following values,%: iron 1 cobalt 61 nickel 1 –ShC

II p and me R 4. ChDA grade zinc chloride (iron content 5-10) is dissolved in demineralized water: 150 g of salt in 400 ml of water. The resulting solution is treated as in the example. The result is a solution of zinc chloride, containing,%: iron cobalt -1 (Nickel 1-10.

The effect of individual parameters of the purification process on the effect achieved is presented in the table.

Thus, the proposed method simplifies the known exclusion expense.

using reagents converting metal impurities into complexes, this results in an increase in the purity of zinc salts containing heavy metals (iron, cobalt, nickel) at a level of 1-1% by weight (according to a known method 2-10% by weight. %).

Claims (1)

Invention Formula The method of purification of aqueous solutions of zinc salts from iron, cobalt and nickel impurities by passing them through a carbon-based sorbent, characterized in that, in order to improve the degree of purification, synthetic carbonic spherical SKS-D of fraction 0.315-0.250 in zinc form is used as a sorbent .  "1 i I I oh oh Ln i ABOUT I1 oh oh about I I I Ltd 1L {H “N - lto about b I o in eg cs R -. -. CM "N lA CM CM p- - ABOUT u a u fe about sh Have CN 00  about  about V about - in - 134 v) 00 N cho - - about - - vO - - r - " one (U f -C Th (U rgch eight four Ii4 s n tSi oh oh cm o sh cm About About