SU1002026A1 - Method of thickening clayey-carbonate suspensions - Google Patents

Description

The invention relates to the mineralization of minerals, in particular to the processes of thickening suspensions and slurries during the processing of potash ores.

Known methods for thickening clay-carbonate suspensions, including the treatment of flocculant suspensions, which use acrylamide polymers: polyacrylamide 1 and copolymers: methacrylic acid and metacrylamide 2, acrylamide C and methyl sulfate (L-methacryloxyethyltrimethylammonium S3).

The disadvantage of these methods is that the molecules of the reagents used are coagulated, especially in the presence of water-soluble salts. A sharp decrease in the activity of the reagent occurs during the processing of water-soluble ores, such as potassium, when the process takes place in an environment of saturated solutions of potassium, sodium, and magnesium sulphates. A decrease in the activity of the reagent leads to the need to increase their consumption, which negatively affects the economic indicators of production.

The closest to the invention in terms of the result achieved is a method that involves treating the pulp with flocculant: a copolymer of acrylamide and acrylic acid 4.

The disadvantage of the method is the reduced activity of the reagent in the presence of water-soluble salts and the low rate of clarification of the suspensions.

The purpose of the invention is to increase the rate of thickening of suspensions saturated with sodium and potassium chlorides.

This goal is achieved by introducing acrylamide copolymer i as flocculant into the pulp. ot, (i-substituted acrylic acid of formula

20

1 -sn-with I / -CHj-CH

I bo

 n "

5h

Well

OH / x

25

where R is an aliphatic saturated or unsaturated hydrocarbon radical of normal or branched structure with the number of carbon atoms from 2

30 to 3 Rj is an aliphatic saturated or unsaturated hydrocarbon radical of normal or branched structure with the number of carbon atoms from 3 .. to 14; the ratio is 100% from 10 to 40 wt.%. Due to the branching of ot, p-substituted acrylic acid molecules, the copolymer macromolecules are less flexible than macromolecules of known floccules. This prevents their globalization and increases reagent activity. The method is carried out as follows. Clay-carbonate suspension is treated with a solution of flocta nta, stirred and settled. Then the clarified part of the suspension is drained.

Characterization of Copolymer Samples Acrylamide copolymers with branched acrylic acid samples were prepared. As an example, we give the conditions for obtaining a copolymer containing 30 wt.% Acid. Sulfuric acid (solution I) is added to 21 g of crystalline acrylamide and 119 g of water to pH-1, 9 g of acid is dissolved in 51 g of water with potassium hydroxide added to pH 8-12 (solution II) -. Solutions I and II were mixed, 0.1% by weight, based on the weight of acrylamide and ammonium persulfate acid, was added. The reaction proceeds at 8-10 ° C. After 16 hours, 0.05% by weight of ammonium persulphate is added and after 24 hours the reaction is complete. Received 15 wt.% The aqueous gel copolymer. The maximum possible acid content in the copolymer is 40 wt.%.

| 3 -izobutil krilovoy acid copolymer of acrylamide with the bottom product production ° C rsoderzhaschim-branched acid, d-branched acid 60% CH -SNg dH b ut HjC 5-methylhexanoic 30 (ci-branched acid.) OL-branched alpha-branched acid ct acid ot-β-branched / Cjo acid with β-branched acid Qt-30% c-β-branched acid C2o-10% Example. The experiments were carried out in solutions saturated with potassium and sodium chlorides with sludge prepared from sylvinite ore. Reagent solutions (concentration of 0.25 wt.%) Were prepared both in water and in brine. The deposition rate of the deposited sludge {W m / h) was determined depending on the consumption of the reagent (G, g / t.TV.). The results of the experiments are shown in FIG. 1 and 2 in the form of IgW f (lgG), representing straight lines. The direct numbering corresponds to the reagent designations in the table. From the data shown in Figures 1 and 2, it can be seen that the activity of the copolymers obtained on the basis of branched acids of the acrylic series increases under adverse environmental conditions (elevated temperature and salt concentration). This favorably distinguishes them from polyacrylamide (direct 1) and copolymers of acrylamide and methacrylamide with acrylic and methacrylic acids (direct 2 and 3). In addition, the preparation of working solutions of the flotation of clusters on the saturated mother liquors of the beneficiation plants does not only decrease, but even slightly increase them. Activity, which is not observed in known flocculants. These properties are especially valuable for illuminating suspensions in the production of salts by the dissolution-crystallization method, when the temperature of the saturated queen cells is U-VO C. From the tested samples, copolymers based on acrylamide and bottom product of the production of cC-branched acid are most active. (see table). Thus, the main advantage of the invention is to increase the rate of clarification of clay-carbonate suspensions saturated with K-Ali and sodium chlorides .65

The continuation of the table is Cala Su Jouli acre 1ac for dd straight with the C HzC / Hz H (-CH2 CHj-CH-CHj .I / 1t-r ftff f4-, Formula inventive use of clay-carbonate suspensions saturated with chlorides and sodium, which includes the treatment of flocculation with flossing, differs by the fact that, in order to increase the condensation rate, the pryor of acrylamide and ot, (b-substituted lyric acid with molecular 3-10 ° C) is introduced into the pulp . common carbon / -dHj-dH aliphatic saturated R., or an unsaturated hydrocarbon radical of normal or branched structure with the number atom in carbon from 2 to 3; aliphatic saturated or unsaturated hydrocarbon radical of normal or branched structure with the number of carbon atoms from 3 to 14, the ratio of -2-100% from 10 to 14 wt.%. x + y Sources of information attention during examination 1. Modern reagents, for ore phloy, Tsvetmetinformation, 1970, 15-16. 2. USSR author's certificate 81362, class B 03 O 03/06, 1969. 3. US patent 3452867, 209-166, published. 196: 7. 4. Author's certificate of the USSR. 95409 g Cl. In 03 About 3/06, 1970 (proip).

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Claims (1)

Claim A method for thickening clay-carbonate suspensions saturated with potassium and sodium chlorides, including treating the suspension with a flocculant, characterized in that, in order to increase the thickening rate, a copolymer of acrylamide and ot, β ”-substituted acrylic acid with molecular mass 2 · is introduced into the pulp as a flocculant 10®- 3-10 ° srvc units of the general formula where K) is an aliphatic saturated or unsaturated hydrocarbon radical of a normal or branched structure with the number of carbon atoms from 2 to 3, * R „- aliphatic saturated ^ζ or unsaturated carbohydrate? native radical of normal or branched structure with the number of carbon atoms from 3 to 14), the ratio is -2-100% from 10 to 14 wt.%. x + y