Method of production of the anti-icing reactant

FIELD: motor-car industry; other industries; methods of production of the anti-icing reactant.

SUBSTANCE: the invention is pertaining to the method of production of the anti-icing reactants for maintenance of roads in winter. The method of production of the anti-icing reactant based on sodium chloride and calcium chloride provides for mixing of the sodium chloride with calcium chloride and their heating and drying. Sodium chloride crystals are coated with the atomized solution of calcium chloride and dried in the "boiling bed" kiln with production of the double-layer granules, the outer layer of which is composed out of calcium chloride. Sodium chloride crystals are coated with calcium chloride in two phases. The forming small particles of calcium chloride are fed into the cyclone, whence the cyclone dust of the calcium chloride is fed into the mixer for intermixing with the wet crystals of sodium chloride. The produced anti-acing reactant has the improved physicochemical thermodynamic properties.

EFFECT: the invention ensures, that the produced anti-acing reactant has the improved physicochemical thermodynamic properties.

3 cl, 1 ex, 2 tbl

 

The invention relates to methods for deicing preparations for maintenance of roads in winter.

Known use as a deicing materials (GMP) of sodium chloride and calcium chloride ("ODN. Requirements for anti-icing materials developed by the Federal road Agency of the Ministry of transport of the Russian Federation, Moscow 2003, p.7). Chemical PGM produced in solid, liquid and soaked in the view.

To improve anti-icing effect crystal PGM (NaCL) is enriched solutions 20-25% concentration of chloride salts (mostly calcium and magnesium) in the amount of 20-30% by weight of PGM. Such salts are called "soaked". Lack of data PGM is the need for additional special equipment for pre-wetting when using the consumers.

A known method of removing snow and ice coatings and anti-drug "Kama" (patent of the Russian Federation N2044118, from 20.09.95)obtained by preparation of a mixture of the chlorides of potassium and sodium, followed by pressing on the roller equipment, crushing molded tiles to fractions of 0.1-10 mm of the Disadvantages of this method of obtaining the drug are large energy consumption and insufficient speed of melting ice.

A composition consisting of a mixture of metal chlorides (RF patent No. 2172331, 08.2001), obtained by grinding the mixture, the pre is satisfactory pereplavlenny at a temperature of 680-800° To achieve a homogeneous composition and chilled, have a drawback - they are effective at temperatures up to minus 6-9°C.

The use of sodium chloride and calcium is known and has found application in the form of mechanical mixtures, melt, pellets obtained by extrusion, press PGM on the basis of calcium chloride and sodium obtained by mixing, heating and subsequent pressing, crushing and classification (HNCM™), produced by THE 6-01-05-100-2001 JSC "Kaustik, Volgograd (http://www.kaustik.ru/specify/hknm.htm). The disadvantage of this method of obtaining the drug are large energy consumption.

The purpose of this invention is the development of technology for anti-icing agent on the basis of sodium chloride and calcium with improved physico-chemical thermodynamic properties.

The main indicator of the effectiveness of anti-icing means is melting ability. However, the design of the previously listed deicing preparations were not taken into account the kinetics of melting of ice under the action of the drug and penetration of crystals, granules or other particles into the snow-ice layer. The ability of particles deicing means to quickly penetrate deep into the layer provides a flow of the melting process in the lower layers of ice, which reduces the adhesion forces of ice from the road surface. In addition, p and melting of the upper layers of ice formation solution on the surface of the ice leads to additional slipperiness on the road. Violation of the adhesion forces of ice from the road surface facilitates mechanical harvesting of melted snow and ice masses.

The essence of the method lies in the fact that de-icing product, consisting of chlorides of sodium and calcium, get in a furnace-type fluidized-bed (COP) drying the solution of calcium chloride on the surface of the crystals of sodium chloride to obtain a double-layer pellet, the outer layer of which consists of calcium chloride. For this purpose, the wet crystals of sodium chloride in the furnace COP is dried at a temperature in the layer 150-190°simultaneously with a solution of calcium chloride. The solution of calcium chloride is sprayed using a mechanical injector. Drops of spray deposited on the surface of the crystals of sodium chloride, forming a layer of calcium chloride on the surface. Small drops of spray solution of calcium chloride, drying themselves, form small particles of calcium chloride, which are carried away in the cyclones. Cyclone dust goes into the mixer where it is mixed with moist sodium chloride and is directed into the furnace COP for drying in the head process. Due to forces of adhesion of the particles of calcium chloride are held on the surface of the salt crystals, and drying the formed agglomerates, the core of which consists of sodium chloride, and the surface layer of calcium chloride.

The example is carried out: anti-drug, consisting of chlorides of sodium and calcium, get in the oven KS drying of a solution of calcium chloride on the surface of the crystals of sodium chloride to obtain a double-layer pellet, the outer layer of which consists of calcium chloride in the amount of 10-20 wt.%. The crystals of sodium chloride particle size of 1-5 mm and a mass fraction of moisture 3-7% in the amount of 15-30 t/h in a furnace COP is dried at a temperature in the layer 150-190°simultaneously with a solution of calcium chloride (35-44 wt.%) The solution of calcium chloride in the amount of 8-15 m3/h pulverized using a mechanical injector. Drops of spray deposited on the surface of the crystals of sodium chloride, forming a layer of calcium chloride on the surface. Small drops of spray solution of calcium chloride, drying themselves, form small particles of calcium chloride, which are carried away in the cyclones. Cyclone dust up to 1 t/h is sent to the mixer where it is mixed with moist sodium chloride and is directed into the furnace COP for drying in the head in the process.

30 minutes
Table 1
Melting capacity and the kinetics of melting of ice at -15°
The fusing ability, depending on the time of interaction, g ice /g product
15 minutes30 minutes60 minutes90 minutes120 minutes
Sodium chloride000,51,92,9
Calcium chloride0,50,81,42,5the 3.8
Kama000,31,52,0
HNCM™0,50,81,42,54,1
Offer medication0,50,81,42,64,1
Table 2
The depth of penetration of the drug into the layer of ice at -15°mm
10 minutes20 minutes40 minutes50 minutes60 minutes
Sodium chloride1,03,03,53,74,34,6
Calcium chloride7,2the 9.711,011,511,711,8
Kama0,82,53,03,23,54,0
HNCM™3,76,17,89,010,610,8
Offer medication5,27,89,09,310,611,0

1. The method of obtaining anti-icing agent on the basis of chlorides of sodium and calcium, comprising mixing sodium chloride with calcium chloride, heating and drying, characterized in that the crystals of sodium chloride cover sprayed with a solution of calcium chloride and dried is in the oven "fluidized bed" with obtaining a two-layer pellet, the outer layer which consists of calcium chloride.

2. The method according to claim 1, characterized in that the crystals of sodium chloride cover calcium chloride in two stages.

3. The method according to claim 1 or 2, characterized in that the formed fine particles of calcium chloride is sent to the cyclone, where the cyclone dust of calcium chloride is sent to the mixer for mixing with the wet crystals of sodium chloride.



 

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SUBSTANCE: the invention is pertaining to the method of production of the anti-icing reactants for maintenance of roads in winter. The method of production of the anti-icing reactant based on sodium chloride and calcium chloride provides for mixing of the sodium chloride with calcium chloride and their heating and drying. Sodium chloride crystals are coated with the atomized solution of calcium chloride and dried in the "boiling bed" kiln with production of the double-layer granules, the outer layer of which is composed out of calcium chloride. Sodium chloride crystals are coated with calcium chloride in two phases. The forming small particles of calcium chloride are fed into the cyclone, whence the cyclone dust of the calcium chloride is fed into the mixer for intermixing with the wet crystals of sodium chloride. The produced anti-acing reactant has the improved physicochemical thermodynamic properties.

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