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

A technology of potassium nitrate and brine mixing method, which is applied in the direction of preparation of alkali metal nitrate, purification of alkali metal nitrate, preparation and molding of alkali metal nitrate, etc. It can solve the problems of affecting product purity, limiting product use, and inconvenient use. Achieve the effects of not easy to agglomerate, wide range of uses, and energy saving

Active Publication Date: 2017-05-10
浙江联大化工股份有限公司
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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

Method used

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

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Embodiment Construction

[0013] Combine now figure 1 The present invention is further described,

[0014] Preparation process of high-purity magnesium hydroxide

[0015] Include the following steps:

[0016] (1) Put nitric acid, magnesium oxide and potassium chloride into the reaction tank at the ratio of mass fraction 5:1:3, and then filter to remove insoluble impurities after the reaction;

[0017] (2) cooling and crystallizing the obtained filtrate, and centrifuging to obtain crude potassium nitrate;

[0018] (3) Add water to the obtained crude potassium nitrate, heat to dissolve, and filter to obtain a high-temperature solution of potassium nitrate; (4) Add the high-temperature solution of potassium nitrate to the cooled low-temperature solution of potassium nitrate in a mass ratio of 1:1 to 3 to crystallize At the same time, add potassium nitrate seed crystals into the crystallizer, control the solution temperature in the crystallizer at 30-50°C by controlling the amount of cooling water, stir...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/04C01D9/16C01D9/18
CPCC01D9/04C01D9/16C01D9/18
Inventor 余一茅余荣华李炳生
Owner 浙江联大化工股份有限公司
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