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Technological process of preparing potassium nitrate and magnesium chloride

A process method and potassium nitrate technology are applied in the field of preparing potassium nitrate and by-product magnesium chloride, which can solve the problems of no recovery of magnesium chloride, low utilization rate of raw materials, environmental pollution, etc., and achieve low price, high utilization rate of raw materials, and reduced cost of raw materials. Effect

Inactive Publication Date: 2007-02-21
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process fails to realize closed-circuit production, and the solution needs to be frozen to minus 10-15°C, which requires high energy consumption. At the same time, magnesium chloride solution is not recovered, and the magnesium chloride solution can only be discharged as waste, polluting the environment, and the utilization rate of raw materials is low.

Method used

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  • Technological process of preparing potassium nitrate and magnesium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: in the nitric acid solution of 100 kilograms of 33%, gradually slowly add powdery magnesite (MgO≥85%. Free CaO≤2%, loss on ignition≤8%. Following quality is all the same), constantly stirring reaction , keep the reaction temperature at 90° C., and adjust the pH value of the solution to 6.5. Then add 40 kilograms of potassium chloride (KCl≥98%, the following mass is the same), stir and dissolve continuously, keep the reaction temperature at 115° C., add a small amount of potassium hydroxide solution and an appropriate amount of calcium chloride, and adjust the pH value of the solution to 6.5. Keep the temperature at 100°C, let the solution settle for 6 hours, filter the solution to remove impurities, then cool the solution down to 5°C, centrifuge to obtain potassium nitrate, wash the potassium nitrate crystals with a small amount of water, separate the potassium nitrate and send it to a dryer for drying , to get 50.5 kg of agricultural potassium nitrate, co...

Embodiment 2

[0036] Embodiment 2: In 90 kilograms of 45% nitric acid solution, add powdery magnesite, continuously stir and react, keep the reaction temperature at 70° C., and adjust the pH value of the solution to 7. Then add 35 kilograms of potassium chloride, stir and dissolve continuously, then add the crude potassium nitrate obtained in Example 1, stir and dissolve, keep the reaction temperature at 100° C., add a small amount of calcium hydroxide, and adjust the pH value of the solution to 6.5. Keep the temperature at 100°C, let the solution settle for 8 hours, filter the solution to remove impurities, then cool the solution down to 25°C, obtain potassium nitrate by centrifugation, wash potassium nitrate crystals with a small amount of water, separate potassium nitrate and send it to a dryer for drying , to obtain agricultural potassium nitrate, containing K 2 O44.3% (dry basis), N 13.65% (dry basis), C 10.5%, water insoluble 0.56%, moisture 0.25%. Separated mother liquor I was mixed...

Embodiment 3

[0037] Embodiment 3: In 260 kilograms of 15% nitric acid solution, add powdery magnesite, continuously stir and react, keep the reaction temperature at 90° C., and adjust the pH value of the solution to 7. Then add 40 kilograms of Potassium Chloride, continue stirring and dissolving, then add the crude potassium nitrate obtained in Example 2, stir and dissolve, keep the reaction temperature at 100° C., add a small amount of potassium hydroxide solution, and adjust the pH value of the solution to 6.5. Keep the temperature at 100°C, let the solution settle for 8 hours, filter the solution to remove impurities, then cool the solution down to 0°C, centrifuge to obtain potassium nitrate, separate the potassium nitrate and send it to a dryer for drying to obtain agricultural potassium nitrate, containing K 2 O 44.6% (dry basis), N 13.6% (dry basis), Cl 0.2%, water insoluble 0.46%, moisture 0.22%. Separated mother liquor I was mixed with mother liquor III obtained in Example 2, evapo...

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Abstract

The technological process of preparing potassium nitrate and magnesium chloride includes the following steps: adding powdered magnesite into nitric acid solution to react, adding potassium chloride for reacting with coarse potassium nitrate, adding additive, maintaining the temperature to deposit, filtering, cooling to crystallize, centrifugally separating and drying to obtain potassium nitrate product for farm use; mixing mother liquor I and mother liquor III, evaporating to concentrate, and cooling to crystallize and separate magnesium chloride hexahydrate crystal; cooling mother liquor II to crystallize, and centrifugally separating to obtain coarse potassium nitrate and mother liquor III. The technological process is simple, low in power consumption, hermetically circulated and without waste produced.

Description

1. Technical field: [0001] The invention relates to a nitric acid conversion method for preparing potassium nitrate, in particular to the technical field of preparing potassium nitrate by using nitric acid, potassium chloride and magnesite as raw materials and producing magnesium chloride by-product. 2. Background technology: [0002] Due to the scarcity of natural potassium nitrate resources on the earth, while the demand for potassium nitrate continues to grow, the technology of producing potassium nitrate has attracted widespread attention. Usually, people use potassium chloride and nitrate as raw materials to convert nitric acid. Potassium, among numerous technical routes of potassium nitrate production, the method of directly producing potassium nitrate with nitric acid as raw material has always been paid attention to by various countries. [0003] In November 1963, Southwest Potash Company of the United States successfully developed a potassium nitrate production meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/08C01F5/02
Inventor 易健民张罡沈晃宏唐阔文阎建辉张一甫钟明杨首云肖丽君
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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