Strontium carbonate production and application

Strontium carbonate is mainly used in the fields of electronics, magnetic materials, fluorescent materials and military products. The content of strontium carbonate and total sulfur impurities in the product powder is very important for the development and applicability of the application field. The process of producing strontium carbonate from celestite ore mainly adopts the carbon reduction method. Specifically, the carbon dioxide kiln gas produced by calcination of limestone in a lime kiln is used to react with the aqueous solution of strontium sulfide from celestite after calcination and reduction and leaching. In the production of strontium carbonate products, the average particle size of the products produced by this process is generally 2.0um, and the average value of total sulfur in terms of SO3 2- is generally 0.3%. This grade of strontium carbonate can only satisfy ordinary strontium carbonate users The added value of the product is not high, although the use of small particle size and low sulfur strontium carbonate can greatly improve the performance of its own products, but to reduce the particle size and total sulfur content of the product, complex processes are required in the prior art And huge costs, and low efficiency.

Contents of the invention

For solving above technical problem, the purpose of the present invention is to provide the industrial production method of a kind of strontium carbonate of the present invention, can produce the strontium carbonate that mean particle size is less than 1.5um, total sulfur (calculated as SO ) amount is less than 0.16%, process method is simple , low cost and high efficiency.

The object of the present invention is achieved like this: a kind of industrial production method of strontium carbonate, its key is to carry out according to the following steps: (1) with the material body that carbon reduction lapis lazuli gained is soaked with high-temperature hot water, prepare strontium sulfide solution (2) feed sufficient pure carbon dioxide into the carbonization tower, and pump strontium sulfide solution into the carbonization tower, and the reaction pressure is 0.3Mpa; (3) control the continuous reaction time for 30 to 40 minues, and discharge the feed liquid; ( 4) Dehydrating the feed liquid, and then drying until the moisture content of the product is less than 0.1%.

The high-temperature hot water in the above step (1) is 85-95°C.

The concentration of the strontium sulfide solution in the above step (1) is 50-60 g/L.

The mixed gas discharged from the carbonization tower in the above step (2) is passed into the second carbonization tower for the first desulfurization, the reaction pressure is 0.2Mpa, and the mixed gas discharged from the second carbonization tower is passed into the third carbonization tower for the first desulfurization. For secondary sulfur removal, the reaction pressure is 0.1Mpa.

Experimental detection, the production of powdered strontium carbonate as a whole is inspected, and the results are shown in Figure 1 and Figure 2.

It can be seen from the results that the average particle size of the powdered strontium carbonate is 1.21um, and the total sulfur content is 0.15%. Fully able to meet market demand.

Beneficial effect:

An industrial production method of strontium carbonate of the present invention can produce strontium carbonate with an average particle size of less than 1.5um and a total sulfur content of less than 0.16%. The disadvantages of unstable gas flow and unstable quality; using the company's existing carbonization equipment, according to the different needs of different users for the physical and chemical indicators of the product, it can be targeted to use a single tower or three towers in series for flexible production adjust.

Detailed ways

The present invention will be further described below in conjunction with embodiment.

Example 1:

A kind of industrial production method of strontium carbonate, carries out according to the following steps:

(1) Soak the material obtained by reducing celestite with charcoal with 85°C high-temperature hot water to prepare a strontium sulfide solution with a concentration of 50g/L;

(2) Feed sufficient pure carbon dioxide into the carbonization tower, and pump strontium sulfide solution into the carbonization tower, and the reaction pressure is 0.3Mpa; the mixed gas discharged from the carbonization tower is passed into the second carbonization tower for first removal sulfur, the reaction pressure is 0.2Mpa, the mixed gas discharged from the second carbonization tower is passed into the third carbonization tower for the second sulfur removal, and the reaction pressure is 0.1Mpa.

(3) control the continuous reaction time for 40 minutes, and emit the feed liquid in the first carbonization tower;

(4) Dehydrating the feed liquid, and then drying until the moisture content of the product is less than 0.1%.

Detection: the average particle size is 1.2um, the total sulfur content is 0.14%

Example 2:

A kind of industrial production method of strontium carbonate, carries out according to the following steps:

(1) Soak the material obtained by carbon reduction of celestite with 90°C high-temperature hot water to prepare a strontium sulfide solution with a concentration of 55g/L;

(2) Feed sufficient pure carbon dioxide into the carbonization tower, and pump strontium sulfide solution into the carbonization tower, and the reaction pressure is 0.3Mpa; the mixed gas discharged from the carbonization tower is passed into the second carbonization tower for first removal Sulfur, the reaction pressure is 0.2Mpa, the mixed gas discharged from the second carbonization tower is passed into the third carbonization tower for the second desulfurization, the reaction pressure is 0.1Mpa;

(3) control the continuous reaction time for 35 minutes, and emit the feed liquid in the first carbonization tower;

(4) Dehydrating the feed liquid, and then drying until the moisture content of the product is less than 0.1%.

Detection: the average particle size is 1.3um, the total sulfur content is 0.15%

Example 3:

A kind of industrial production method of strontium carbonate, carries out according to the following steps:

(1) Soak the material obtained by carbon reduction of celestite with 95°C high-temperature hot water to prepare a strontium sulfide solution with a concentration of 50g/L;

(2) Feed sufficient pure carbon dioxide into the carbonization tower, and pump strontium sulfide solution into the carbonization tower, and the reaction pressure is 0.3Mpa; the mixed gas discharged from the carbonization tower is passed into the second carbonization tower for first removal Sulfur, the reaction pressure is 0.2Mpa, the mixed gas discharged from the second carbonization tower is passed into the third carbonization tower for the second desulfurization, the reaction pressure is 0.1Mpa;

(3) control the continuous reaction time for 30 minutes, and emit the feed liquid in the first carbonization tower;

(4) Dehydrating the feed liquid, and then drying until the moisture content of the product is less than 0.1%.

Detection: the average particle size is 1.45um, the total sulfur content is 0.15%

Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the inspiration of the present invention, those skilled in the art can make a variety of similar It means that such transformations all fall within the protection scope of the present invention.