Process for producing rice-shaped crystalline potassium nitrate by brine mixing method

Abstract

The invention discloses a process for producing rice-shaped crystalline potassium nitrate by a brine mixing method. The process comprises the following steps: reacting nitric acid, magnesium oxide and potassium chloride serving as raw materials; cooling for crystallization to obtain crude potassium nitrate; mixing a high-temperature solution and a low-temperature solution of the potassium nitrate according to a certain proportion by the brine mixing method; adding a potassium nitrate seed crystal at the same time; controlling the temperature and stirring speed of a mixed solution; crystalizing to obtain the rice-shaped crystalline potassium nitrate. In the production process, a reaction solution is heated by heat produced in a reaction of the nitric acid and the magnesium oxide, so that the reaction speed is high, and energy is saved; cooling crystallization is performed in a way of mixing brine and adding the seed crystal, so that the crystallization speed is high, the efficiency is high, and the obtained potassium nitrate product is an elliptical rice-shaped crystal, and has the advantages of high purity, low impurity content, large crystal particle size, uniform granularity, high fluidity, no tendency to agglomeration, convenience in use and wide application.

Description

technical field [0001] The invention specifically relates to the technical field of chemical product production, in particular to a process for producing rice-shaped crystalline potassium nitrate by adding brine. Background technique [0002] In the existing potassium nitrate production process, direct water cooling or air cooling is often used to cool and crystallize, and the obtained potassium nitrate crystals are relatively fine, mostly powdery, easy to agglomerate, and inconvenient to use. The conventional solution is to add an anti-caking agent, but this affects the purity of the product and limits the use of the product. Contents of the invention [0003] In order to solve the deficiencies in the prior art, the present invention provides a process for producing rice-shaped crystalline potassium nitrate by adding brine. [0004] The technical solution that the present invention adopts is: a kind of process of producing rice granular crystalline potassium nitrate by a...

AI Technical Summary

Problems solved by technology

[0002] In the existing potassium nitrate production process, direct water cooling or air cooling is often used to cool and crystallize, and the obtained potassium nitrate crystals are relatively fine, mostly in powder form, easy to agglomerate, and inconvenient to use

The conventional solution is to add an anti-caking agent, but this affects the purity of the product and limits the use of the product

Images