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Method for manufacturing granulated sodium nitrite

A technology for manufacturing sodium nitrite, which is applied to the preparation and molding of nitrous acid and alkali metal nitrate, and the liquid is divided into beads and granulated. It is not easy to agglomerate, the particles are regular and uniform, and the effect is fast

Inactive Publication Date: 2004-12-29
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
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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

Method used

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  • Method for manufacturing granulated sodium nitrite
  • Method for manufacturing granulated sodium nitrite

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Embodiment approach

[0015] Below in conjunction with accompanying drawing, the present invention is further stated:

[0016] The manufacture method of industrial sodium nitrite product of the present invention is:

[0017] (1) Using powdered industrial sodium nitrite products in the prior art as raw materials, including sodium nitrite products produced by chemical methods and exploited in ore deposits; The melting point is 308°C. This heating and melting mode can adopt following mode, also can adopt other technical modes certainly, as long as heating can make solid-phase sodium nitrite become liquid-phase sodium nitrite, all refers to the method of the present invention. Heating and melting to make it into a liquid phase, one is to use the higher melting point of sodium nitrite to remove most or all of the water carried by it during its melting process; the other is to facilitate the next step of spray granulation; (3) The liquid phase prepared in step (2) is subjected to spray granulation. Th...

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Abstract

The present invention discloses an industrial sodium nitrite product and its production method. The physical and chemical properties of said product are as follows: it is made into the form of ball or egg granular body, grain size is 0.5-3 mm, and the water content of the described granule body is less than or equal to 0.5%. Its production method uses the existent industrial sodium nitrite product as raw material, the above-mentioned raw material is heated and moten into liquid phase, and said liquid phase is sprayed and granulated so as to obtain the invented product. Said product features low water content, no blocking and good fluidity.

Description

(1) Technical field [0001] The invention relates to a method for producing granular sodium nitrite. (2) Background technology [0002] U.S. Patent No. 4,430,241A (publication date 1984.02.07) discloses the eutectic of sodium nitrite and potassium nitrate prepared by spray granulation, the moisture content of the final product is generally between 0.05% and 0.10%, and the particle size is 5 mesh Between ~30 mesh. One of its preparation methods is to feed the mixture of sodium nitrite and potassium nitrate into the melter, and the melter uses an electric heater to directly heat the raw materials to form a mixed liquid phase at 220 ° C ~ 245 ° C, and remove moisture and gas, mix The liquid phase enters the crystallization converter again, relying on the water cooler at the lower part to cool and crystallize to form a flaky mixed salt solid product, which is then pulverized and sieved by a grinder to become granules; the second preparation method is to mix sodium nitrite and po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J2/02C01B21/50C01D9/18
Inventor 康仕芳李建荣陈松刘太年赵珺宋光朴辛振林沈国宏
Owner TIANJIN UNIV
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