Method for preparing potassium nitride from calcium nitride byproduct of nitro phosphate

A technology of nitrophosphate fertilizer and potassium nitrate, which is applied in the preparation of alkali metal nitrate, etc.

Inactive Publication Date: 2012-06-20
YUNNAN CHEM RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, to provide a method that not only solves the problem of calcium nitrate treatment of the industrial by-product of nitrophosphate fertilizer, but also produces high-quality and high-concentration potassium nitrate fertilizer, and does not produce difficult-to-handle waste in the process. Method for preparing potassium nitrate by nitrophosphate fertilizer by-product calcium nitrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] First add 100kg of water into the dissolution tank, pour 34.2kg of potassium chloride, start stirring and dissolving, make the chloride into a saturated solution and pump it into the potassium nitrate reaction tank; then decompose the phosphate rock with nitric acid to produce wet calcium nitrate for the phosphate fertilizer plant Add 37.6 kg of crystals into the potassium nitrate reaction tank, mix with potassium chloride solution, and stir slowly for metathesis reaction, the reaction time is 15 minutes; then freeze to 5°C, crystallize transparent long needle-shaped potassium nitrate crystals, filter and pass through potassium nitrate The drying device was dried at 120° C. for 1 hour to obtain 39.4 kg of finished product potassium nitrate. After crystallization, the mother liquor was concentrated and crystallized to obtain 21.7 kg of by-product calcium chloride.

Embodiment 2

[0040] First add 150kg of water into the dissolution tank, pour 51.3kg of potassium chloride, start stirring and dissolving, make the chloride into a saturated solution and pump it into the potassium nitrate reaction tank; then decompose the nitric acid to produce wet calcium nitrate in the phosphate fertilizer plant Add 56.4 kg of crystals into the potassium nitrate reaction tank, mix with potassium chloride solution, and stir slowly for metathesis reaction, the reaction time is 30 minutes; then freeze to 0°C, crystallize transparent long needle-shaped potassium nitrate crystals, filter and pass through potassium nitrate The drying device was dried at 120° C. for 1 hour to obtain 59.1 kg of finished product potassium nitrate. After crystallization, the mother liquor was concentrated and crystallized to obtain 32.5 kg of by-product calcium chloride.

Embodiment 3

[0042]First add 100kg of water into the dissolution tank, pour 10kg of potassium sulfate, start stirring and dissolving, make potassium sulfate into a saturated solution and pump it into the potassium nitrate reaction tank; kg was added to the potassium nitrate reaction tank, stirred and mixed with potassium sulfate solution, reacted, and steam was introduced at the same time, the reaction temperature was maintained at 100 ° C, and the reaction time was 2 hours; after the potassium nitrate reaction solution was filtered through a filter, potassium nitrate solution and gypsum were obtained. Contains a small amount of potassium; finally, concentrate the potassium nitrate solution, pass through the potassium nitrate cooling crystallization separation device, crystallize and separate out the wet potassium nitrate crystals, and after centrifugal drying, then dry at 120°C for 1 hour through the potassium nitrate drying device to obtain the finished potassium nitrate 9.9 kg, the mothe...

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Abstract

The invention relates to a potassium nitride preparation method, in particular to a method for preparing potassium nitride from a calcium nitride byproduct of nitro phosphate, which belongs to the technical field of production of agricultural potassium nitride fertilizers. The method includes steps of a, firstly, adding water in a dissolving tank, starting to stir and dissolve after industrial potassium chloride or potassium sulfate is poured, preparing the potassium chloride or potassium sulfate into saturated solution and pumping the saturated solution into a potassium nitride reaction tank; b, secondly, metering wet calcium nitride crystals, adding the wet calcium nitride crystals into the potassium nitride reaction tank, mixing and stirring the wet calcium nitride crystals with the solution obtained in the step a to carry out double replacement reaction, and preparing potassium nitride reaction liquid; and c, finally, crystallizing the potassium nitride reaction liquid prepared in the step b, and then separating potassium nitride crystals. The method solves problems of treatment of calcium nitride industrial byproducts of nitro phosphate, simultaneously, produces high-quality high-concentration potassium nitride fertilizers, and cannot produce waste difficult to be treated in a procedure.

Description

technical field [0001] The invention relates to a method for preparing potassium nitrate, in particular to a method for preparing potassium nitrate from calcium nitrate, a by-product of nitrophosphate fertilizer, and belongs to the technical field of agricultural potassium nitrate fertilizer production. Background technique [0002] Calcium nitrate is a by-product of nitrophosphate fertilizer industry. It is obtained by decomposing phosphate rock with nitric acid. It contains 11.86% nitrate nitrogen, which is a low-concentration nitrate nitrogen fertilizer. Because the nutrient content is too low, the unit nutrient transportation cost is high. Therefore, it is uneconomical to use as a fertilizer. [0003] Potassium nitrate is a fertilizer that is very soluble in water. The nitrate and potassium ions contained in it can be absorbed by crops, and no harmful substances remain. It is an excellent nitrogen-potassium binary compound fertilizer. It contains 13.85% of nitrate nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/12
Inventor 肖勇吴立群梁雪松张必江杨斌
Owner YUNNAN CHEM RES INST
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