SU833568A1 - Method of water purification from suspended particles - Google Patents

Description

The invention relates to the purification of water, and more specifically to methods for purifying water from suspended 4acTHUj contained therein, and can be used to purify water from suspended particles consisting mainly of different copper oxides and iron oxides, copper hydroxides, iron hydroxides, or mixtures thereof various ratios, for example, in the production of iron oxide pigments, in the enrichment of iron ores by the flotation method. The method can also be used for wastewater treatment, used. for irrigation of fields or other household needs with limitations to the content of copper and iron oxides in water up to 0.1 mg / l. . A method is known for purifying water from suspended particles by flocculation of water with nJM polyelectrolyte, which is a copolymer of vinylpyrrolidone and urea acrylic acid. This method allows virtually quantitative trapping of metal oxide and hydroxides at an initial concentration of 25-1000 mg / l. The residual concentration is 0.5-2 mg / l. I However, the application of a known method for purifying water from oxides and hydroxides of copper and iron is not effective enough. For example, when the initial concentration of copper oxide with the formula 100 mg / l, the application of the known method provides water purification to 0.5 mg / l for only 30 minutes at a polyelectrolyte consumption of 1 g per 1 l of water to be purified. There is also known a method of extracting or removing metal ions from solutions by precipitating them in the form of hydroxides, followed by flotation using surface-active substances (surfactants), which contain a rather long hydrocarbon content. radical 2, The use of this method is complicated by the poor solubility of surfactants in water. The closest of the known technical essence and the achieved result to the proposed is a method of water purification from suspended particles containing oxides of copper and iron, which consists in the introduction into water of anionic surfactants, in particular long-chain carboxylic acid, blowing water through the mass of water and by removing the coagulum that forms, which pops up with air bubbles to the surface of the water, by mechanical means (scrapers, etc.) h.

The disadvantages of this method are that the degree of purification is not high enough, which is unacceptable for a number of industries, for example for irrigating fields; the high cost of the process of water purification from suspended particles caused by the operation of the activation of suspended particles by heavy metal ions and contamination of the purified water by the fatty acids used, which is unacceptable, in particular, when using purified water to drink. This forces additional purification of water from surfactants, introduced in the process of water purification from suspended particles, particles.

When using purified water for irrigation by a known method, there is an additional drawback, the essence of which is that the fatty acids, the ostakidies, in the de-suspended water, slowly decompose with time. For example, it takes 5 years to decompose the acid used in accordance with the known method under the conditions of the irrigated area.

The purpose of the invention is to increase the degree of water purification from suspended particles containing copper and iron oxide.

This goal is achieved by using 1,3-dioxacyclanes as a surfactant, preferably in an amount of 0.050, 1 g per 1 g of suspended particles. The process is carried out at a temperature of 5-25 and a pH of 5-11.

The method is carried out as follows.

In a container with water containing suspended particles. The copper or iron hydroxides) are administered to the 1,3-deoxycyclan in the form of an alcohol solution at water temperature and pH 5-11. Then the water with the injected dioxacyclane is mixed, after which air is injected into the bottom layers of water. Air bubbles float up and carry away the recoverable ones. substances that interact with dioxacyclan. The coagulum that has emerged on the surface is removed from the water surface by means of scrapers. The whole process; cleaning takes 15-20 minutes. at the initial end of HTpcUJiHH suspensions 101000 mg / l using the method provides a residual concentration of suspensions 0.5-1 mg / l. The 1,3-dioxane buccal scale depends on the degree of contamination of water with suspensions of copper or iron oxides and is 0.05-0.1 g per g of suspension. Compared with fatty acids, 1,3-dioxcyclic

decompose 15 times faster in natural water bodies.

Example 1. In the chamber of a 136 V-FL flotomachine, 1 l of a suspension of highly dispersed copper hydroxide, having a temperature of pH 5 and containing 100 mg / l of metal, is placed and 5 mg of 1,3-dioxacycan in the form of 0.5% alcohol solution. Then the solution is purged with air for 15 minutes and analyzed. The use of 1,3-dioxacyclanes provides almost complete extraction of copper oxides and hydroxides. Residual concentration less than 0.5 mg / l. The change in the pH of the treated suspension 5 in the range from 5 to 11 does not affect the efficiency of the process.

Example 2. Conditions are the same. Suspension - iron hydroxide.

Concentration

0 suspensions, mg / l1000

PH11

Temperature, C25

amount

dioxacyclane, mg / l 100 5 Processing time, min 15 Residual iron hydroxide concentration, mg / l 1

0 Example 3. Conditions. Suspension - iron hydroxide. Concentration

suspension, mg / l10

PH5

5 Temperature, c20

Amount of dioxacyclan, mg 0.5 Processing time, min 15 Residual concentration Qi of iron hydroxide, mg / l

Less than 0.5

The proposed method is compared with the known will allow to intensify the process with ensuring a higher degree of purification and reduce the cost of the cleaning process.

Claims (3)

1. A method of purifying water from suspended particles consisting of oxides and / or hydroxides of copper and / or iron by treating it with surfactants and then separating the precipitate with flotation, in order to increase the degree of purification, 1,3-dioxacyclanes are used as surfactants. 2. A method according to claim 1, characterized in that the 1,3-dioxacyclanes are introduced in an amount of 0.05-0.1 g per gram of suspension at a pH of 5-11. 58335686 Information sources, . 2. UK Patent taken into account in the examination number 1028741, cl. With 1 With, pub. 1966. 1. USSR author's certificate 3. Glembotsky V.A. and others. Flotation. No. 472906, cl. C 02 B 1/20, 1972.M., GONTI, 1961, p. 19 and 511.