Method of improving hardness of granular sodium nitrate

A sodium nitrate and hardness technology, which is applied in the preparation and application of nitrate fertilizers and alkali metal nitrates. It can solve the problems of large amounts of powder, unstable handling, and high empty shell rate, and achieve low cost and low energy consumption in the production process. Small, efficient effect

Active Publication Date: 2015-05-06
TURPAN BRANCH OF SINKIANG NITRATE MINERALS
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] Usually, after granulation, the sodium nitrate product has a particle strength of 0.5-2kgf, a particle size of 2-4mm, and a particle content of 60-90%. The empty shell rate is high, and it is unstable during the handling process, which may easily cause a large amount of powder.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: After adding 1.4% waste salt, the sodium nitrate content in the product is 97.78%, the sodium chloride content is 1.26%, the sodium sulfate content is 0.83%, the average particle hardness is 2.07kgf, and the particle content of particle size 2-4mm is 96.76%.

Embodiment 2

[0018] Example 2: After adding 1.6% waste salt, the sodium nitrate content in the product is 97.72%, the sodium chloride content is 1.38%, the sodium sulfate content is 0.77%, the average particle hardness is 2.72kgf, and the particle content of particle size 2-4mm is 98.33%.

Embodiment 3

[0019] Embodiment 3: After adding 1.8% waste salt, the sodium nitrate content in the product is 97.56%, the sodium chloride content is 1.47%, the sodium sulfate content is 0.84%, the particle average hardness is 3.12kgf, and the particle content of particle size 2-4mm is 98.82%.

[0020] The present invention is mainly applied to the material transportation in the granulation of sodium saltpeter ore, to control the amount of waste salt added, and to add an appropriate amount under the premise of ensuring the quality of the product according to the customer's requirements for product purity.

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Abstract

The invention relates to a method of improving the hardness of granular sodium nitrate. According to the method, a waste salt is added by using a hopper and a screw conveyer in the process of conveying the wet sodium nitrate which is obtained by crystallizing through evaporation to a melting tank, wherein the waste salt contains 60-90% by weight of sodium chloride or 10-40% by weight of sodium sulfate. Due to the addition of 0.01-2.5% of the waste salt which contains sodium chloride or sodium sulfate, the hardness of the granular sodium nitrate can be up to 2-4kgf, and the granular sodium nitrate with a size of 2-4mm accounts for more than 96%. Due to the added waste salt which is rich in sodium chloride, the hardness of the granular sodium nitrate can be improved. By adopting the method provided by the invention, the granular sodium nitrate which has a lower content of water, higher roundness and more uniform size than the existing granules can be obtained. In addition, the method can realize continuous production, consumes less energy, is high in efficiency and low in cost and can be particularly applied to the field of tower-based chemical granulation.

Description

technical field [0001] The invention relates to a compound preparation technology of IPC international patent classification C01D alkali metal sodium, especially a method for improving the hardness of granular sodium nitrate. Background technique [0002] Nitrate minerals are generally white, colorless, light gray, vitreous luster, transparent to translucent, often in needle-like, hair-like, granular, shell-like, salt bloom-like aggregates, low density, brittle , soluble in water, low hardness. In the industrial grade sodium nitrate standard GB / t 4553-2002, there is a clear requirement for the appearance to be white fine crystals, and light yellow or light gray is allowed. Industrial-grade sodium nitrate is an oxidizing agent with a hazard category of 5.1, which has stricter requirements during transportation. According to international safety transportation requirements, industrial-grade sodium nitrate products must be granular, and the dust content must be strictly contr...

Claims

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Application Information

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IPC IPC(8): C01D9/18C05C5/02
CPCC01D9/18C01P2004/60C05C5/02C05D9/00C05G5/12
Inventor 茚晓宝荣大林顾建王庆芳张建民王新梅宋玉东
Owner TURPAN BRANCH OF SINKIANG NITRATE MINERALS
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