The method of obtaining anti-drug

 

The invention relates to a technology for de-icing preparations on the basis of the chlorides of sodium, potassium, magnesium. The method includes a heat treatment of a mixture of metal chlorides, which use carnallite ore with a particle size less than 6 mm, and the heat treatment is carried out in the apparatus of the fluidized bed at a temperature in the layer 110-140oC, followed by grinding and classification of the finished product. The technical result is a simplification of the method and expanding the use of de-icing product. 1 C.p. f-crystals, 1 table.

The invention relates to a technology for de-icing preparations on the basis of the chlorides of sodium, potassium, magnesium.

A well-known drug for the removal of snow and ice cover (see SU 1560546 A1, class 6 09 K 3/18, 30.04.90. Bull. 16). The product contains potassium chloride and 10.5-14.7 per cent, magnesium chloride to 7.0 and 9.8%, magnesium oxide and/or magnesium metal 1.0 to 4.0%, water the rest.

The mixture of chlorides is obtained by mixing the dry salts or by dissolution using in the form of solutions.

Reduced corrosion activity is achieved by addition of magnesium oxide or magnesium, in the presence of chloride is converted into magnesium hydroxide, resulting in obrazets the high freezing point of the solution and the difficulty of obtaining a homogeneous material by simple mixing.

Known composition to prevent ice on the roads (see the patent of Russia 2141500, CL 6 09 K 3/18 from 1998.07.22, publ. 1999.11.20) containing inorganic salt is magnesium chloride and/or carnallite.

The disadvantage of this method is the difficulty of obtaining a homogeneous material simply mixing that leads to its segregation during transportation, storage and use.

A method of obtaining anti-drug - prototype (see the patent of Russia 2172331, CL 7 09 K 3/18 from 31.03.2000, publ. 20.08.2001). The proposed method get the drug on the basis of metal chlorides with its subsequent grinding, the chlorides of metals used waste magnesium production, which before chopping pre proplast at a temperature of 680-800oTo achieve a homogeneous composition and cool.

The disadvantage of this method is its complexity and the limited use of the drug because of the relatively high freezing temperature of the liquid phase formed during the melting of the ice, since the content of potassium chloride in a known drug exceeds 68%; in tailing electrode mixture composition: KCl 40-50%; NaCl, 8% To 20%; MgCl 6-12%, contains up to 15% of the ballast oxides metagem disadvantage of this method is its complexity due to the need of heat treatment salts (penetration) at high temperatures (680-800oC), which requires increased energy consumption. In the case of molten electrolyte - waste magnesium production therein as impurities contains fluoride, a single metal oxides and other compounds of calcium, which causes the need to control runoff water on this indicator in order to avoid environmental pollution.

In the known method also provides for the grinding and classification propelling material class 1-5 mm. However, to our knowledge, this grinding is formed up to 50% of the product fraction is 1 mm, the disposal of which creates additional difficulties.

The task of the invention is to simplify the method and expanding the use of de-icing product.

The positive effect is achieved by the fact that in contrast to the known method, including heat treatment of a mixture of chlorides of metals, grinding and classification, the proposed method as a mixture of chlorides of metals used carnallite ore with a particle size less than 6 mm, and the heat treatment is carried out in the apparatus of the fluidized bed at a temperature in the layer 110-140oC. Classification are emitting fractions 1-10 mm, with fractions less than 1 mm serves on termoobrezan what about the method as a mixture of chlorides of metals used carnallite ore, which presents a mixture of sodium chloride (NaCl) and carnallite (lMgCl26N2On) with a mixture of potassium chloride and insoluble (H. O. - CaSO4Caso3, clay). For example, Karnal-lithium ore Verkhnekamskoe Deposit has the following chemical composition, wt.share, %: KCl 17,7; NaCl 30,0; MgCl222,18; CaSO4+CaCl21,84; N. About. 3,11; H2O 25,17. Carnallite ore is an environmentally friendly product, as it doesn't contain toxic impurities. The content of sodium chloride, calculated on the mixture of NaCl+KCl is:The table shows the dependence of the freezing temperature of water solutions of salts from their composition.

The data show that for icing, in a wide range of ambient temperature should be used, either almost pure salt (potassium chloride, sodium chloride), which is not economically feasible, or a mixture of potassium chloride with sodium chloride, where the concentration of sodium chloride exceeds 40%. It should be noted that the content of NaCl in de-icing the product obtained according to the method, does not exceedin the slurry productand the proposed method varies vogelaere the preparation of magnesium chloride increases its scope due to the possibility of use at low temperatures (down to minus 30oC). The proposed method content MgCl2in the product exceedsin terms of dry substance.

In contrast to the known method, the heat treatment of the mixture of the chlorides of the metals are in the fluidized bed apparatus at a temperature in the layer 110-140oC. When this occurs, the melting of natural carnallite with the formation of two-water mixture and chetyrehletnego the crystalline composition: KClMgCl2nH2O, where n=2 and 4. Due to processes of melting and dehydration of crystalline apparatus in the fluidized bed effective averaging of the deicing product, sintering the fine fraction and the formation of crystalline non-caking granular material. When the temperature in the layer over 140oWith the dehydration process more intensively, but this is accompanied by hydrolysis of magnesium chloride with the formation of magnesium oxychloride and hydrochloric acid in the gas-vapor phase. The content of Mao in heat-treated drug exceeds the 0.3-0.4%.

When the temperature in the layer below 110oSince there is a danger of melting the gas distribution grid in a fluidized bed apparatus and the formation of the "goats". For the same pricillas flue gases and prone to clumping.

After heat treatment of metal chlorides subjected to classification by class 1-10 mm in accordance with the requirements of the consumers. The coarse fraction is crushed and mixed with small initial ore and sent for heat treatment. When mixing hot small fractions of chlorides with ore observed agglomeration of particles due to the melting of crystalline ore and hydration of dehydrated carnallite. Classification can lead to rumble or fluidized bed apparatus with a feed mixture of cyclone dust.

The data show that the simplified method is achieved through the use of carnallite ore, lowering the temperature of heat treatment (110-140oInstead of 680-800oC) and the use of high-performance devices fluidized bed instead of melting furnaces, and expansion of use by increasing the content in environmentally friendly de-icing the preparation of the chlorides of sodium and magnesium, and improved physical and mechanical properties of the drug due to agglomeration its fine fractions.

The method is as follows.

Carnallite ore, for example, the Verkhnekamskoe Deposit consisting of a mixture of sodium chloride and carnallite, mixed with potassium chloride is 6 mm is subjected to heat treatment at a temperature of 110-140oWith the apparatus of the fluidized bed. Thermally treated product is classified according to the class 1-10 mm or depending on the requirements of consumers in any other class. The fine fraction (less than 1 mm) in the hot mix from the original ore and the mixture is subjected to heat treatment, and a large fraction (if they occur) are ground and return to the classification. Small classes can be allocated either mechanically or in a fluidized bed apparatus at the heat treatment in the form of a cyclone dust.

Examples of the method of the Example 1.

1000 wt. including carnallite ore Verkhnekamskoe Deposit composition, wt. share, %: KCl 17,7; NaCl 30,0; MgCl222,18; CaSO4+CaCl21,84; insoluble 3,11; N2About 25,17, was subjected to grinding and classification of class 6 mm coarse fraction returned to the division, and fractions less than 6 mm was subjected to heat treatment at a temperature of 120-130oWith, and then classification by class 1-10 mm on the screen.

Fraction less than 1 mm and cyclone dust in an amount up to 10% of the heat-treated material was subjected to mixing with the original carnallite ore, and the fraction of +10 mm - 1% - grind and returned on the classification.

After stabilization returned flows received the product in the quantity 870 wt. hours of composition (wt:center; margin-top:2mm;">Claims

1. The method of obtaining anti-icing agent on the basis of chlorides of metals, including heat treatment of a mixture of chlorides of metals, grinding and classification, characterized in that the mixture of chlorides of metals used carnallite ore with a particle size less than 6 mm, and the heat treatment is carried out in the apparatus of the fluidized bed at a temperature in the layer 110-140oC.

2. The method according to p. 1, characterized in that classification are emitting fractions 1-10 mm, with a fraction less than 1 mm is fed to the heat treatment in the form of a mixture of carnallite ore.

 

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