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A kind of optical glass grade high-purity potassium nitrate processing method

A processing method, potassium nitrate technology, applied in the direction of alkali metal nitrate, chemical instruments and methods, alkali metal compounds, etc., can solve the problem that the impurity content index cannot meet the optical glass grade potassium nitrate products, and the content of potassium nitrate is difficult to reach 99.9%. , Potassium chloride raw material sources and high index requirements, to achieve stable product quality, low use cost, and reduce production costs

Inactive Publication Date: 2016-10-19
LIUYANG JINHE CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Using the traditional double decomposition method of potassium chloride and ammonium nitrate to prepare potassium nitrate, the final potassium nitrate content is difficult to reach more than 99.9%, and other impurity content indicators cannot meet the requirements of optical glass grade potassium nitrate products;
[0004] 2. The quality of the product is unstable, and the content of impurity ions varies greatly between different batches;
[0005] 3. There is no effective removal method for calcium, magnesium, sodium and other ions entrained in raw materials such as potassium chloride, thus affecting the content of the final potassium nitrate product
[0006] 4. There are high requirements on the source and index of potassium chloride raw materials, and the quality of potassium nitrate products produced by different brands and contents of potassium chloride varies greatly

Method used

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  • A kind of optical glass grade high-purity potassium nitrate processing method
  • A kind of optical glass grade high-purity potassium nitrate processing method

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Embodiment 1

[0035] A kind of optical glass level high-purity potassium nitrate processing method, it comprises following processing steps:

[0036] 1) Cooling and crystallization of ingredients and semi-finished products: mix the circulating mother liquor and the recrystallization mother liquor according to the volume ratio of 5:1, add 7% volume ratio of potassium chloride, heat up to 90°C, continue for 0.5 hours, and cool to room temperature , forming a semi-finished crystal suspension solution (1);

[0037] 2) Primary centrifugal flotation: the semi-finished crystal suspension solution (1) is pumped into the primary centrifugal flotation equipment, and after separation and processing for 3 hours, the separated mother liquor (2) and low-purity potassium nitrate crystallization solution (3 );

[0038] 3) Secondary centrifugal flotation: the low-purity potassium nitrate crystallization solution (3) is pumped into secondary centrifugal flotation equipment, and after separation and processi...

Embodiment 2

[0048] A kind of optical glass level high-purity potassium nitrate processing method, it comprises following processing steps:

[0049] 1) Cooling and crystallization of ingredients and semi-finished products: mix the circulating mother liquor and the recrystallization mother liquor according to the volume ratio of 5:1, add 10% volume ratio of potassium chloride, heat up to 105°C, continue for 0.5 hours, and cool to room temperature , forming a semi-finished crystal suspension solution (1);

[0050] 2) Primary centrifugal flotation: the semi-finished crystal suspension solution (1) is pumped into the primary centrifugal flotation equipment, and after separation and processing for 4 hours, the separated mother liquor (2) and low-purity potassium nitrate crystallization solution (3 );

[0051] 3) Secondary centrifugal flotation: the low-purity potassium nitrate crystallization solution (3) is pumped into the secondary centrifugal flotation equipment, and after separation and pr...

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Abstract

The invention discloses a method for processing optical glass level high-purity potassium nitrate. The method comprises the following steps: preparing materials, cooling and crystallizing a half-finished product, performing first-class centrifugal flotation, second-class centrifugal flotation and third-class centrifugal flotation, separating ammonium chloride, re-dissolving crude nitre, performing ionic edulcoration and packaging a finished product. The purity of potassium nitrate processed by using the method can be up to 99.9%, no extra production equipment is needed, impurity removal can be synchronously achieved in operation of a conventional potassium nitrate half-finished product re-dissolution unit, the production cost is low, the production quality is stable, and the environment is not polluted.

Description

technical field [0001] The invention relates to the technical field of potassium nitrate processing, in particular to a processing method for optical glass-grade high-purity potassium nitrate. Background technique [0002] The existing potassium nitrate production method adopts double decomposition four-step circulation method: 1, add potassium chloride in the circulation mother liquor, 2, after solution cooling and crystallization, centrifugal separation obtains potassium nitrate; 3, add ammonium nitrate in the crystallization mother liquor; 4, solution passes through Evaporation concentration, cooling crystallization, centrifugation to obtain ammonium chloride, and the separated mother liquor is recycled; this production method has the following disadvantages: [0003] 1. Using the traditional double decomposition method of potassium chloride and ammonium nitrate to prepare potassium nitrate, the final potassium nitrate content is difficult to reach more than 99.9%, and ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/00C01C1/16
Inventor 张三山李远征
Owner LIUYANG JINHE CHEM CO LTD