Preparation method of granular sodium nitrate

Abstract

The invention discloses a method for producing granular sodium nitrate, which is carried out according to the following steps, using powdered sodium nitrate product as raw material; heating and melting the above-mentioned raw material into a liquid phase; spraying and granulating the prepared liquid phase; mixing with the liquid phase Salt is used as a heat source to indirectly heat sodium nitrate, so that solid-phase sodium nitrate becomes liquid-phase sodium nitrate; the liquid-phase sodium nitrate is input into the high-level tank by a pump, and the liquid-phase sodium nitrate is pressed into the low-level prilling tower by using the potential difference , the liquid-phase sodium nitrate is injected from the nozzle on the upper part of the material making tower to become small droplets, and the small droplets are in contact with the countercurrent air during the falling process in the prilling tower, and are cooled to obtain granules. It has the characteristics of regular and uniform finished product particles and high production efficiency.

Description

(1) Technical field [0001] The invention relates to a method for producing granular sodium nitrate. (2) Background technology [0002] US Patent US4430241A (published date 1984.02.07) discloses the use of spray granulation to prepare a eutectic of sodium nitrate and potassium nitrate. The moisture content of the final product is generally between 0.05% and 0.10%, and the particle size is 5 mesh. Between 30 meshes. One of its preparation methods is to feed the mixture of sodium nitrate and potassium nitrate into a melter. The melter uses an electric heater to directly heat the raw materials to form a mixed liquid phase at 220°C to 245°C, and remove moisture and gas. The phase then enters the crystallization converter, relies on the water cooler at the lower part to cool and crystallize to form a flaky mixed salt solid product, which is then crushed and sieved into granules by a grinder; the second preparation method is to prepare a mixture of sodium nitrate and potassium nitrate I...

AI Technical Summary

Problems solved by technology

The preparation process of method 1 in the above-mentioned disclosed technology is complicated, and there are potential safety hazards in directly using electric heaters for heating. In addition, the surface of the produced particles is not smooth enough, the particles are irregular, and the fluidity is poor; method 2 uses hot air to dry and granulate. Higher, slower particle formation

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