SU973485A1 - Procnss for purifying effluents from high molecular aliphatic amines - Google Patents

Description

The invention relates to methods for cleaning industrial wastewater from organic impurities, in particular high molecular weight amines, by sorption on natural aluminosilicate materials and can be used to clean enrichment and metallurgical effluents, followed by regeneration of organic reagents.

A known method of purification of wastewater from organic impurities by sorption of the latter on natural silicate sorbents, for example schungite, modified with an alkaline solution 1.

The closest to the invention to the technical essence and the achieved result is a method for purifying wastewater from organic impurities, based on passing harmful waste through an aluminosilicate mordenite sorbent modified with an aqueous solution containing 0.53 n. HC1 and sodium or potassium ions 2.

The disadvantages of this method are the low degree of purification from organic impurities (about 94%), the high specific consumption of the sorbent (1-3%) and the long duration of the agitation process - 1-2 hours.

The purpose of the invention is to increase the degree of purification and purification from fine suspensions.

This goal is achieved by the fact that according to the method of sewage purification from high molecular weight aliphatic amines, including their contact with an aluminosilicate sorbent, waste of hydrochloric acid processing of kaolinite chlorite ore in the form of pulp in a solution containing aluminum and iron chlorides is used as a sorbent liquid phases, equal to 8-10: 1 15 and pH 6-8.5.

The waste product of the sour-acid processing of kaolinithore ore is represented ophthalmically with a small flaked phase with the molar ratio S i 0,: A1 J 3-3.5 of the following chemical composition, Ex.%: AlijOj 28.6-32.4} Si02 61.06 -65.16-, 0.2-0.3fSM 0.3-0, 4s T Yuz 0.8-1.3; Sfz 0.3-0, b} MDO 0.06-0.1; CaO 25 0.18-0.2; til O 2.8-3.2f loss after perforation 1.6.

Kaolinite chlorites are typical components of the weathering crust of most rare-metal 30 deposits, in particular, rare-earth, tungsten-molybdenum, etc., which can be processed by hydrometallurgical schemes using acids and bases, for example, acid salt solution. The waste product is obtained by processing kaolinite chlorite ore from the Kundybay deposit (Kazakhstan) with a hydroacid solution containing, g / l: HC1 110, CaCl2250, at a temperature of 110 ° С and leaching duration 4 h. As a result, a waste solid residue and an aluminum-irony solution that goes for the extraction of valuable components, a non-metallic solution containing the main elements, g / l: HC1 20-40, MgCl2 + CaCl, 3-10, Fedj 80, A1C1e25 can be used

Consumption sorbenrn effluent bent, g / l

as a coagulant and is used for pulping.

Example 1. In a 2 l glass reactor, 1 l of waste water from the mica cycle is contacted.

flotation (pH 9.5, ANP content 2.5 mg / l) with a solid waste product of hydroacid refining at various expenses of the latter. References are also given for comparison.

Tats of experiments on the sorption of ANP on mordenite modified with an aqueous solution of 1N. HC1 and 150 g / l CaClr, ceteris paribus.

The results of experiments on the study of the effect of sorbent consumption on wastewater treatment f 20 min. ANP - 2.5 mg / l are given in Table. one,

Table 1

Lightening,%

The degree of purification.

Salt Acid Processing

0.02 0.04 0.12 0.05 0.38 0.58 0.70 0.02 0.10 0.58 0.98 2.4 2.7

The results show that the waste product of hydrochloric acid processing of kaolin and chlorite ores is a more efficient and economical sorbent of organic impurities. However, this waste does not provide adequate clarification of wastewater. For the purpose of additional 1st wastewater treatment from fine mists

68.3 69.4 64.5 63.8 68.2 69.8 69.2 67.4 68.6 68.2 68.4 65.3

and reducing the residual concentration of ANP, the waste of hydrochloric acid processing is used in the form of pulp containing, along with the solid component, a leaching solution.

Example 2. To 1 l of wastewater from a mica flotation cycle with an initial pH of 9.5 and an ANP content of 2.5 mg / l

the pulp containing the alumina-iron leaching solution of the above composition and the waste solid component are delivered at a ratio of phases in this pulp G: T - 8: 1. 340 mg of solid and 2.7 ml of solution are added per liter of the effluent solution, while the pH of the initial effluent drops from 9.5 to 8.5. The resulting mixture, pH 8.5, is agitated for 20 minutes. At the same time, a good clarification of the effluent is observed at 97-98%. The degree of sewage treatment from ANP is increased by comparison. All experiments were performed on the same solution of effluent from the mica flotation cycle with an initial pH of 9.5 and an ANP content of 2.5 mg / l. Using the waste product of the hydroacidic processing of kaolinitlorite ore and the alumino-iron solution, pulps are prepared with different W: T ratios from 10: 1 to 2.5: 1. A certain part of the pulp is added to the stock effluent solution to restore the required pH value, then the mixture is agitated for 20 minutes.

using only the solid component of 2.2%.

The synergistic effect of the combined use of the solid residue and the leaching solution can be 5 can be explained, apparently, by additional sorption of ANP on the sediment suspension.

In tab. 2 shows the results of experiments on the study of the influence of the ratio of W: T and the pH of wastewater treatment on the purification rates.

, Table 2

According to these data, the dependence of the degree of sorption of ANP on the ratio of phases L: T with a favorable ratio of pH 8-8.5. It is a curve with a maximum, which makes it possible to recommend as the optimal ratio of phases Z: T - 8-10: 1. Using the proposed method allows to increase the degree of wastewater treatment from 94 to 96-98%, significantly reduce the sorbent consumption, further purify the wastewater solution from finely dispersed suspended 5 particles and reduce the cost of the process due to

use dumping products. Sorbed flotation reagents can be regenerated by the reextraction paths with their lag-volatile polar solvent and returned to the flotation stage.

Claims (2)

Invention Formula 1, Wastewater treatment method for 10 high molecular weight aliphatic amines, including contacting them with an aluminosilicate sorbent, characterized in that, to increase the degree of purification, waste material I is used in the quality of the sorbent hydrochloric acid processing of kaolin and chlorite ores, 2, the method according to p. 1, I distinguish in and and with the fact that, in order to further purify from fine suspensions, the waste of hydrochloric acid processing of kaolinite chlorite ore is taken as a slurry in a solution containing aluminum and iron chlorides at the ratio of solid and liquid phases equal to 8-10: 1, and a pH of 8-8.5. Sources of information taken into account when examining 1, USSR Author's Certificate 508488, class, C 02 F 1/28, 1972. 2. The UK patent, / 1494314, cl. C 1 A, 1977.