SU857015A1 - Method of reagent softening of mineralized water - Google Patents

Description

(54) METHOD OF REAGENT TENSION NOCHERALIZED

one

The invention relates to the field of water treatment and can be used in the energy, coal and other industries in sewage treatment plants for mineralized natural and industrial wastewater.

There is a method of water softening with a mixture of soda with lime and soda with caustic soda. The process is carried out in the presence of seeds, for example, fine sand of threshing calcium carbonate and magnesium oxide.

However, 1m thickening of water, preferably containing magnesium ions, proceeds slowly, and the injected seeds are ineffective.

Closest to the proposed invention to the technical essence

refers to the way gcheni mind water |

preferably containing magnesium ions, in which it is necessary to treat the softened water with a mixture of alkali and soda, taken in an amount not less than

WATER

105% of stoichiometric, in the presence of a precipitate separated earlier from this water, followed by separation of the latter together with the newly formed precipitate f2 J.

The disadvantage of the method is the duration of the process and the high moisture content of the precipitate, which complicates its further processing.

The purpose of the invention is to reduce the process time without reducing the degree of purification.

The goal is achieved by the treatment of saline water, preferably containing magnesium ions, by treatment with alkali and soda by the pacTfeor in the presence of a precipitate separated from the water and subsequent settling.

In this case, the precipitate is preliminarily dried at 80–900 ° C for 0.151.0 hours and introduced in an amount of 0.021.6 kg / m. .Example. The treatment is subjected to mine water of trace composition rNa 2750 mg / l; K 33 mg / l; SG4870 mg / l; Sch 300 mg / l; HCO; 4.3 mEq / L; mg-dq / l; M 20 mEq / l; 5vR MG-EKV / L. Within 100 minutes, 3 liters of a suspension containing 90 g of sodium hydroxide, 0.02–1.6 kg / m of precipitate separated from this water and dried at 80–900 ° C for 0,151jO 4jafter this water is settled Temourature YvO I 801 80 D 80 12 Continuer iii of - H drying, h 12 A 6 0.5 ir (5 Å, 5, 3.5 1.5 0. 0. 8 8 Vl increase in the amount of injected sludge dried at 120 ° C for speed Parameters F another Amount of sludge injected, kg / m 0 0.02 0.04 Initial sedimentation rate, m / h 2.0 2.9 3.0 Duration of settling until the vla NOSTA osad5 0 1.5 1.5 Single 95% h

As can be seen from the above data, the proposed method has advantages over a known method (shortened by several 1), the duration of the process). The given Dantae also show the preferred range of drying temperatures (12018СРс) and the duration of drying (, Оh), since with these parameters the duration of the process is miuishal and is 1-2 hours.

An overflow for hours only leads to a drying of the precipitate, which can also be used in accordance with the prescription.

fOdM way. A high holding at 900 ° C for 2.0 hours (calcination) results in the chemical transformation of the precipitate.

In case of high-temperature chemical changes in the sediment, ballast salts accumulate, for example, due to the formation of insoluble silicates or calcium and magnesium ferrites, which interfere with settling, while during drying, their formation is excluded.

Claims (2)

Thus, the proposed method makes it possible to shorten the duration of the process (settling) by more than 2-3 times without deteriorating the quality of the treated water. The moisture content of the precipitate is separated (clarified water is decanted from the precipitate. The softened water has a hardness of 0.7 mg-eq / l, the moisture content of the sediment is 95%. The dried sludge water in an amount of 0.16 sediment production in softened water with a humidity of 95% is shown in Table I, Table 1 12оГ | 80 Г 18о | 900 900 I 90о1 900 1.0 0.5 1.0 1.0 0.10 0.15 1.0 2.0, 0 1.0 1.0 1.5 1.0 2.0 12, 12, settling in the process of intelligence, are given in Table 2. Table a 2 Method 1 Lime 0, 08 0.16 -0.60 1.6 3.7 4.5 4.8 5.0 1.1 1.25 1.0 0.75 0.6 585 decreases by 1-1.5%, which allows It does not reduce sludge beds by 1.5-2% or reduce by 5-10% the amount of heat consumed to dry it. Formula of the invention Method of reagent reduction of saline water containing predominantly magnesium ions, treatment with alkali and soda solution isolated from water, followed by settling, differs from that with the fact that, in order to shorten the duration of the process without a degree of purification, the precipitate is preliminarily dried at 80-9 ° C during ue 0.15-1.0 hours and is administered in an amount of 0,02-1,6 kg / mm. Sources of information taken into account in the examination I. US Patent No. 3262877, CL, C 02 B 1/22, 1966, 2.Kulsky L.A. Design and calculation of clean & to waterworks facilities. Kiev, “Budivelnik, 1972, p.424.