SU947075A1 - Process for purifying effluents from coal concentration plants - Google Patents

Description

(5) METHOD FOR CLEANING WASTE WATER CARBON LIQUID

   : -,, /.

The invention relates to the beneficiation of minerals and 8 coal, metallurgical and other industries can be used.

Polymeric flocculants used to accelerate the sedimentation and thickening of sludge at the beneficiation plants: Kometa, Oka, polyacrylamide, etc. are selected. 13.

However, the use of these flocculants is ineffective for wastewater treatment, and therefore they have limited application in industry.

The closest in technical essence and the achieved result to the proposed method is a process of sewage treatment of coal plants, including the introduction of flocculant, sedimentation and separation of solid and liquid phases. Metas 2 is used as flock nta.

The disadvantages of this method include the low deposition rate with significant costs.

flocculant (50-100 g / t), low solubility of metas in water and the difficulties associated with this when preparing working solutions, since flocculating nt is produced as a powder with an active substance content of 30-35%.

The purpose of the invention is to increase the deposition rate .g%

This goal is achieved by using flocculating ethylene glycol monovinyl ether or diethylene glycol monovinyl ether copolymers with methacrylic acid JJ lots or acrylamide of the general formula

(-CH2-ciH-)) ,,

m

E

SNG ONG

O-: R, - OH R - H V R-H; To SOOI, -SOCN ,; Mv-750Oa-10000O; m. P -1-3: 3-1. The copolymer is synthesized by radical copolymerization of the indicated monomers in the presence of azo isobutyric acid dinitrile or potassium persulfate in an amount of up to 0.2% of the total weight of the monomers at. rfpoftecc is carried out with a solution of methanol, water, or mixtures thereof at a 1: 2 monomer / solvent ratio. Mr.Gooperimer. re-precipitate from water or methanol solution with ethyl acetate three times and vacuum dry to constant weight. The isolated products are highly soluble in water, methanol, and other hydroxyl-containing solvents. Offered copolymers are obtained based on cheap monomers - mono

The table shows the deposition rate for 3 minutes from the start of the experiment.

Thus, the rate of clarification of S5 suspensions when adding a copolymer of monolvinyl ether of ethylene glycol is increased compared with the addition of 9

What is known flocculant at 0.8 0, 4 cm / min, i.e. by 10-8%.

Claims (2)

The use of the proposed flocculant to clarify wastewater from coal preparation plants provides an increase in the deposition rate of 54 glycol vinyl ethers. The method for preparing the copolymers is as follows. EXAMPLE 1 A mixture of 3 g of ethylene glycol monovinyl ether CtO mol / and 5.16 g of methacrylic acid (60 mol) was dissolved in t7.2 g of water, 0.0172 g of azo isobutyric acid dinitrile was added. , 2% by weight of the monomer mixture. The resulting mixture is poured into a vial, rinsed with a purified inert gas, sealed and incubated for 1 h in a thermostat at. The resulting product is precipitated in ethyl acetate and, after three times re-precipitating at a constant weight, Example 2. The wastewater of a coal preparation plant with a solid content of 0 g / l is poured into 0.5 l cylinders. The deposition is carried out without the addition of flocculation, with a DS of the metas and the proposed flocculation in the amount of 20-100 tons / ton. The contents of the cylinder are agitated, settled, and they observe the sedimentation rate in terms of the increase in the height of the wort fluid. solid particles, obtaining practically pure water returned to the process, i.e. the possibility of creating closed technological cycles, the prevention of environmental pollution,; :., Formula of the invention. Method of sewage treatment of coal plants, inclusive, introduction of flocculation, sedimentation, separation of solid and liquid phases, and so on; that, in order to increase the speed of degradation, ethylene glycol monovinyl ester copolymers can be used as flo; kol oi ethylene glycol monomethyl ether with methacrylic acid or acryl amide of the general formula RV:::::: :-one , / . -, s where R-H; -CH "- CHK HE R-H ;; - CH R-COOH; - CONH, i; MBsTSOoo-fooooo; Tnvvi i-5l b Sources of information taken into consideration during the examination 1. Borts M. V, Application of synthetic floccuts 8 technical circuits of foreign coal preparation plants. CNIEIugol, sir. Techno briquetting ang. N., 2. Karpovich AF, Tarasor B.G., Krivoshein. To the question of intensification of the clarification of the sludge waters of coal plants.; Coll .: scientific work of the Kuzbass Poitechnical Institute, N b9 C.143-1W .: