SU1033179A1 - Method of producing pelletized filtering material for cleaning water - Google Patents

Abstract

DREAMS OF PREPARATION OF GRANULAR FILTER MATERIAL FOR CLEANING, including the introduction of a non-organic additive into the clay suspension with 1-nd heat of granules and granules at 700-900 C, o and h a fo U and 6 with the use of heat and granules at 700-900 C, o and h a fo U and 6 with the use of heat and granules at 700-900 C, o and h a fo U and 6 with the use of heat and granules at 700-900 C, o and h a fo U and 6 with the use of heat- filtering ability, as an additive, dolomitization is used. The amount of quench is 15-30% by weight of% 1 clay slurry.

Description

Sa | WITH

: o The invention relates to a method for producing a filtering material and can be used to purify natural waters and to purify line liquids in filter structures with both downward and upward filtering. A known method for producing a filtering material for water purification, including the introduction of crushed pyrite Ogarkov in clay suspension with subsequent granulation in the fluidized bed and roasting granules obtained at 1000-1250С 1. The disadvantage of the method is the inadequate filtering capacity of the material, due to the small specific surface of the obtained granules. The closest to the invention in technical, essence and achievable result is a method of obtaining a granular filtering material for water purification, including an introduction to magnetite grain size 0.3–1.0 mm in the amount of 20–40% of the weight of the clay suspension, followed by granulation, in a fluidized bed and burning of the obtained granules at 600–900 ° C2J. However, the known method is characterized by insufficient filtering ability of the material due to the low microporosity of the granules, which significantly reduces their specific surface. The purpose of the invention is to increase the filtration capacity of the material. (The set goal is achieved C: according to the method, which includes the introduction into the clay suspension of dolotised lime in an amount of 15-30% of the mass of the clay suspension, followed by granulation at 300-350 ° C and roasting the pellets at 700EOO C. The chemical composition of dolomitization The following is the most common limestone,%: 70 90 OaCOj; 7-2t MgCC 3-6 S f 02 - ffejO The additive and the amount of less than 10% of the mass of the clay suspension does not cause the filtering ability to flow. Increasing the limestone 30% is impractical because the filtering capacity of the mat The rial is not improved at the same time. Example: A 50 l clay slurry with a humidity of 70% and a density of 1.25 g / cm is injected with various amounts of dolomitized limestone (b, 2B-kg, 9.37 kg and 18.75 kg, which corresponds to 10%, 15%, and 30% of the mass of the clay slurry), after mixing, the suspension is granulated at 300-350 G in a granulator, operating under the principle of a fluidized bed.The resulting granules are burned at. Table 1 shows the characteristics of the granules. In technological tests, granulated filter material obtained by known and proposed methods is loaded into filters with a diameter of 50 mm and a height of 2000 mm. The thickness of the loading layer with a grain size of 1.0-1.2 mm is 1.0 m. The water is filtered from top to bottom. The filtration rate is kept constant at 8 m / h. The quality of the water supplied to the filtration is characterized by the following indicators: caustic substances 4–5 mg / l, chromaticity 40 degrees, pO 7.1. Immediately before being fed to the filters in the initial water, coagulant - aluminum sulphate with a dose of 7.0 mg / l, is added according to the criterion of filter efficiency. materials used is the amount of water cleaned by the filter cycle The filter cycle of each filter is considered the period of time during which the filter produces water that meets the requirements of GOST 2874-73 Drinking water, namely: chromaticity 20 degrees, turbidity 1.5 mg / l, pH 6.5-8.5. Table 2 presents the results of technological tests. Thus, the proposed method makes it possible to increase the filtering capacity of the material (the duration of the filter tank and, accordingly, the amount of water purified per filter cycle increases, which ensures an increase in the efficiency of the filtering facilities. The amount of dolomitic limestone in relation to the large mass of the clay suspension,%

0.8-1.0 1.22

ten

0.8-1.0 1.78

15

0.8-1.0 2.10

thirty

1 mm table

1,3

0.36

0.411.6

0.47

3.8

Table, 2 characteristics of the granules Mechanical strength Specific surface Istiray | "awn, immelchenost,% IMOCTb,%

Claims (1)

METHOD FOR PRODUCING A GRANULAR FILTERING MATERIAL 'FOR WATER CLEANING, including introducing an inorganic additive into a clay suspension followed by granulation upon heating and firing granules at 700-900 ° C, characterized in that dolomite is used as an additive with a slit to increase the filtering ability. 'in the amount of 15-30% by weight of the clay suspension. >