Method of granulating lithium salts

 

(57) Abstract:

The invention relates to methods of granulation lithium salts. The invention consists in that in the chamber and injected lithium salt, create mode "fluidized bed" by supplying heated fluid and creates a vacuum in the range of 5-40 mm water.article Through a nozzle by means of compressed air supplied to the solution of lithium salts and granularization. Increasing the height of the fluidized-bed forming granules of lithium salts come in a host acceptance, and pulverized fraction by means of the exhaust fan is directed into the absorber, and then for further processing. The method allows to obtain granules of lithium salts, particularly chloride, lithium bromide, resistant to destruction, and to increase the yield. 9 C.p. f-crystals, 2 Il.

The invention relates to the field of chemical industry, in particular to methods of granulation lithium salts, intended for the production of lithium salts.

Lithium salts are usually obtained from lithium carbonate, or by reacting with acids. Almost all alkali metal salts dissolve easily in water. Only lithium forms several relatively insoluble salts. Ions of the alkali metal is in nformation contain water molecules. Because of this, and packaging of lithium salts has always received special attention.

There is a method of granulating salts of alkali metals, according to which a mixture of sulfate and potassium chloride is melted and granularit, resulting in contact with the rotating cooling surface (see WO 96/29287, A1, Dead Sea Works LTD. , 26.09.96, C 01 D 3/22), the lack of which is the fact that when granulating lithium salts, the final product is unstable, easily decomposed and inconvenient for storage and further use.

The closest in technical essence and the achieved result is a method of granulating lithium salts, including the introduction of salts into the camera, the processing of reagent water in the turbulent flow regime, the formation of granules and release of granules from the camera (see US, 4320105, A Lithium Corporation of America, 16.03.82, C 01 D 15/00) prototype. The disadvantage of this method is the low quality pellets lithium salts and low yield of the final product.

An object of the invention is to create a method of producing granules of lithium salts, which would allow it to increase their resistance to damage, ultimately leading to improved conditions and increased yield about is the introduction of salts into the chamber, the processing of reagent water in the turbulent flow regime, the formation of granules and release of granules from the camera, according to the invention, the processing of the salts is carried out in the presence of granulomatous, as water reagent is used, the lithium salt solution, and the processing of the salts is carried out in the mode of "fluidized bed" with compressed air, with dust-like fraction of lithium salts are removed from the chamber for further processing.

The technical result in the maximum level is achieved when the following conditions are met:

as granulomatous use carbamide hydrogen peroxide or other granularization, which picked empirically for a specific lithium salts;

as the lithium salt solution use solutions of lithium chloride, bromide or other salts;

- processing of salts is carried out at a pressure in the chamber 5-40 mm water column;

as the coolant serves the air heated to a temperature of 380-420oC;

a solution of a lithium salt served in dispergirovannom condition;

the lithium salt solution is fed through a nozzle in a stream of compressed air;

- an aqueous solution of lithium salts and granularization serves at the same time;

- water plants is the Ktsia lithium salts are removed from the chamber through the openings in the absorber for further use as a source of raw materials.

In Fig. 1 shows a device for granulating lithium salts. The installation includes a camera 1 "fluidized bed", Luke 2 download lithium salts, node 3 acceptance of granules, the pipe 4 for feeding the heat carrier and the absorber 5 to derive pulverulent fraction of lithium salts. The fan 6 is used to create vacuum in the chamber, Tara 7 - for packing of lithium salts.

In Fig.2 presents a photograph of the finished product granules lithium salts.

The essence of the proposed method is illustrated by examples of its implementation.

Example 1.

In the camera 1 "fluidized bed" in line 4 serves the air heated to a temperature of 400oC, by means of the exhaust fan 6 generate a vacuum of 15 mm of water column. Through Luke 2 download lithium chloride and lithium hypochlorite (LiOCl) for activation of the reaction (in small quantities). In the lower part of the chamber through a nozzle (not shown) serves an aqueous solution of lithium chloride in a stream of compressed air. Before serving in a solution of lithium chloride added urea ((NH2)2CO). Under these conditions, the camera fluidized-bed 1 place the following reactions:

< / BR>
Molecules hydrazine (N2NK4) are the active centers granulometry lithium chloride in node 3 of acceptance and further transported in the packaging container 7.

In fluidised bed combustion chamber 1 part pellets used up, forming a dust-like fraction. By means of the exhaust fan 6 pulverulent fraction catch in the absorber 5, from which connections are sent for recycling.

Example 2.

Under the conditions described in example 1, the camera 1 is injected lithium bromide. Through a nozzle serves an aqueous solution of lithium bromide in the compressed air. Before serving in a solution of lithium bromide add the hydrogen peroxide In the chamber 1 "fluidized bed" hydrogen peroxide is destroyed by the following reactions:

H2O2H2O+1/2O2.

Atomic oxygen is the active center granulometry of lithium bromide.

The size of the granules depends on the dimensional parameters of the working parts of the camera 1 "boiling layer" and can be changed by varying the feed mode aqueous solution of lithium salts and granularities.

The use of the proposed method increases the quality of pellets lithium salts by increasing their resistance to destruction and, consequently, to improve conditions and increase yield.

1. Method of granulating lithium salts, including an introduction to the camera, processing the the action scene, that the processing of the salts is carried out in the presence of granulomatous, as water reagent is used, the lithium salt solution, and the processing of the salts is carried out in the mode of "fluidized bed" with the supply of coolant and compressed air, with dust-like fraction of lithium salts is removed from the camera.

2. The method according to p. 1, characterized in that as granulomatous use carbamide hydrogen peroxide.

3. The method according to p. 1, characterized in that as the aqueous reagent use solutions of salts of chloride, bromide lithium.

4. The method according to p. 1, characterized in that the processing of the salts is carried out at a pressure in the chamber 5-40 mm water. Art.

5. The method according to p. 1, characterized in that the coolant serves the air heated to a temperature of 380-420oC.

6. The method according to p. 1, wherein the lithium salt solution served in dispergirovannom condition.

7. The method according to p. 1, wherein the lithium salt solution is fed through a nozzle in a jet of compressed air.

8. The method according to p. 1, characterized in that an aqueous solution of lithium salts and granularization serves at the same time.

9. The method according to p. 1, characterized in that an aqueous solution of lithium salts, granulate pulverized fraction of lithium salts are removed from the chamber through the openings in the absorber for further processing.

 

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