Preparation method of industrial high-grade pure potassium nitrate

Abstract

The invention discloses a preparation method of industrial high-grade pure potassium nitrate and belongs to the field of inorganic synthesis. The preparation method comprises (1) purified potassium nitrate aqueous solution preparation: adding deionized water and industrial potassium nitrate into a potassium nitrate reactor, heating the mixture to 60-80 DEG C, adjusting solution pH to 8.0-8.5 through a potassium hydroxide solution, filtering the solution through an ultra-micro filter with pore diameters of 0.2-1 micrometer, feeding the filtrate into a flash distillation concentration reactor, and adjusting solution pH of the filtrate to 6.5-7 through dilute nitric acid so that a purified potassium nitrate aqueous solution is obtained, and 2) high-grade pure potassium nitrate preparation: concentrating the purified potassium nitrate aqueous solution, putting the concentrate into a centrifugal machine, carrying out solid-liquid separation to obtain potassium nitrate crystals, putting thepotassium nitrate crystals into a vacuum drier and carrying out drying for 1-2h to obtain the superior grade pure potassium nitrate finished product. The preparation method of the industrial high-grade pure potassium nitrate has simple processes, high production efficiency, low impurity content and high purity.

Description

technical field [0001] The invention belongs to the field of inorganic synthesis, and in particular relates to a preparation process of industrialized superior grade pure potassium nitrate. Background technique [0002] Potassium nitrate is an inorganic chemical product with a wide range of uses. It is a chlorine-free high-quality fertilizer in agriculture. It is widely used in gunpowder, fireworks, metal welding aids, ammonia synthesis catalysts, ceramics, etc. in industry. It is used in food. Used as coloring agent and preservative for meat products; used as diuretic, cooling agent and raw material for the production of penicillin potassium salt, rifampin and other drugs in medicine; in terms of optical glass products, it is used for the production of high-end mobile phone screens and tablet computer displays Raw material for chemically strengthened glass. [0003] At present, the main processes for producing potassium nitrate at home and abroad include sodium nitrate and...

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Problems solved by technology

But the deficiencies of patent 201410288564.X are: (1) only laboratory production, can not be directly applied to industrial production; (2), the whole production process needs more than seven hours, production efficiency is low, because the heating temperature is too high (3) After the introduction of potassium carbonate, it is necessary to utilize the method of recrystallization to remove excess potassium carbonate, and because the solubility of potassium carbonate and potassium nitrate is relatively large, it is necessary to recrystallize at a certain temperature Only in the lower range, the process steps are more complicated, and there is a certain degree of difficulty in operation

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