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Preparation method of high-purity mass potassium nitrate

A technology of potassium nitrate and pure water, which is applied in the purification of alkali metal nitrate, etc., can solve the problems of low purity and unusable potassium nitrate products, and achieve the effects of reducing the content of impurities, reducing energy consumption, and ensuring quality

Inactive Publication Date: 2013-07-17
潍坊昌盛硝盐有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 3. Because the purity of the potassium nitrate product obtained by the above method is not high, especially the impurity content such as chloride ions, sulfates, water insolubles seriously exceeds the standard, so it cannot be used in special industry applications, such as chemical reagents, optical glass, etc.

Method used

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  • Preparation method of high-purity mass potassium nitrate

Examples

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Embodiment 1

[0031] Embodiment 1: a kind of preparation method of high-purity potassium nitrate

[0032] 3,000 kg of high-purity pure water is produced through a two-stage reverse osmosis water production system, and the conductivity of the water quality does not exceed 10μS / cm, and it is used for standby. Select the potassium nitrate that reaches the national standard (standard GB / T1918-2011), the content reaches 99.4%, and the weight is 3000 kilograms. Put 3000 kg of pure water into the heating reactor and heat it to 75°C. Start stirring, and put 3000 kilograms of ordinary potassium nitrate into the heating reactor. At this time, the temperature should be kept at 75°C, and the mixture should be stirred continuously until it is completely dissolved. After the dissolved potassium nitrate solution is filtered through a filter press, it is sent to a cooler for cooling and crystallization. When the potassium nitrate solution in the cooler is cooled to 20°C, stop cooling. The cooled crysta...

Embodiment 2

[0034] Use the centrifuge of example 1 to wash 300 kilograms of washing liquid in the dehydration separation process, 2700 kilograms of mother liquors, add up to 3000 kilograms. Choose 2000 kg of ordinary potassium nitrate. Put the above mixed solution and potassium nitrate into the heating reactor, stir and heat to 75°C until all the potassium nitrate is dissolved. After the dissolved potassium nitrate solution is filtered through a filter press, it is sent to a cooler for cooling and crystallization. When the potassium nitrate solution in the cooler is cooled to 20°C, stop cooling. The cooled crystallization mixture is sent to an automatic centrifuge for dehydration and separation. During the dehydration process, 350 kg of pure water is used, and the automatic washing program of the centrifuge is used to wash the crystalline potassium nitrate to further dissolve and take away various salt impurities in the potassium nitrate. The crystalline potassium nitrate after washing...

Embodiment 3

[0036] Use the centrifuge washing liquid 350 kilograms in the dehydration separation process of example 1, example 2, mother liquor 2650 kilograms, add up to 3000 kilograms. Choose 3300 kg of ordinary potassium nitrate. Put the above mixed solution and potassium nitrate into the heating reactor, stir and heat to 80°C until all the potassium nitrate is dissolved. After the dissolved potassium nitrate solution is filtered through a filter press, it is sent to a cooler for cooling and crystallization. When the potassium nitrate solution in the cooler is cooled to 30°C, stop cooling. The cooled crystallization mixture is sent to an automatic centrifuge for dehydration and separation. During the dehydration process, 500 kg of pure water is used, and the automatic washing program of the centrifuge is used to wash the crystalline potassium nitrate to further dissolve and take away various salt impurities in the potassium nitrate. The crystalline potassium nitrate after washing and...

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Abstract

The invention relates to a preparation method of potassium nitrate. The preparation method comprises steps of dissolving, crystallizing, washing, dehydrating and drying. By utilizing the preparation method, the purity of the potassium nitrate is greatly improved, contents of various impurities in the potassium nitrate are greatly reduced, and the requirements on the high-purity potassium nitrate by various industries are met. By utilizing a one-step purification method for purified water production, the investment is greatly reduced, the energy consumption is reduced, the production cost is reduced, large-scale industrial production can be formed, and mass requirements on the high-purity potassium nitrate in a market are met.

Description

technical field [0001] The invention relates to a method for preparing salt, in particular to a method for preparing high-purity potassium nitrate. Background technique [0002] There are many methods in the current potassium nitrate production process. Such as metathesis, synthesis, ion exchange and so on. The potassium nitrate produced by above-mentioned several methods has following shortcoming: [0003] 1. High-purity potassium nitrate cannot be obtained, and the general content is about 99.4%; [0004] 2. The content of other impurities is relatively high, as shown in the following table: [0005] [0006] 3, because the potassium nitrate product that above-mentioned method makes is not high in purity, especially as impurity content such as chloride ion, sulfate, water-insoluble substance seriously exceeds the standard, therefore can not be used for the application of special industry, as chemical reagent, optical glass etc. Contents of the invention [0007] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/16
Inventor 牟邦志牟红光
Owner 潍坊昌盛硝盐有限公司
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