Method for producing high-water solubility nitrophosphate fertilizer by phosphorite nitrolysis and calcium nitrate freezing
A technology for nitrophosphate fertilizer and calcium nitrate, which is applied in the field of phosphate fertilizer to achieve the effects of high utilization rate, improved quality of crop products and less waste discharge
Inactive Publication Date: 2013-07-24
GUIZHOU RES INST OF CHEM IND
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But so far, there is no report on the process of decomposing phosphate rock with nitric acid, decalcification by freezing method, neutralizing and separating insoluble impurities such as iron, magnesium and aluminum with ammonia, and then evaporating, concentrating and crystallizing to produce high water-soluble nitrophosphate fertilizer. patent applications
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[0043]Adopt the nitric acid of the present invention to decompose phosphate rock, defluorinate, freeze and separate calcium nitrate, neutralize and precipitate insoluble impurities such as iron, magnesium, aluminum and separate, then evaporate, concentrate and crystallize to produce high water-soluble nitrophosphate fertilizer. The specific method is:
[0044] The first step acid hydrolysis
[0045] Mix nitric acid with a mass fraction of 50% and the filtered washing liquid, then add it to the acidolysis tank, add Guizhou Zhijin phosphate concentrate powder under stirring for acidolysis, the acidolysis temperature is 60°C-70°C, and the residence time is 2-4h. (The amount of nitric acid is 90% to 110% of the theoretical amount). After the reaction, filter the acidolysis solution, wash the filter residue with water, and return the washing solution to mix with nitric acid to decompose rock phosphate powder;
[0046] The composition of Zhijin phosphate concentrate powder is shown ...
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The invention discloses a method for producing high-water solubility nitrophosphate fertilizer by phosphorite nitrolysis and calcium nitrate freezing. The high-water solubility nitrophosphate fertilizer is prepared from the processes of phosphorite nitrolysis, fluorine removal, calcium nitrate freezing separation, further removal of calcium in ammonium sulfate, ammonia liquor neutralization and deposition removal of impurities, and evaporation concentration and crystallization. Specially, the method for producing high-water solubility nitrophosphate fertilizer by phosphorite nitrolysis and calcium nitrate freezing comprises the following steps of 1, acidolysis, 2, fluorine removal, 3, calcium nitrate freezing crystallization, 4, double decomposition removal of calcium in ammonium sulfate,5, neutralization and deposition removal of impurities, 6, evaporation concentration and crystallization, and 7, phosphogypsum transformation. The high-water solubility nitrophosphate fertilizer prepared by the method has a dissolution rate great than or equal to 99.9% in water, wherein nitrate nitrogen is easy for be absorbed by drops, satisfies requirements of a few commercial crops, has a highutilization rate, and improves a crop yield by 8 to 25% and crop quality. The method reduces waste discharge, is environmentally friendly, can be utilized for structure adjustment and product upgradeand update of the traditional phosphorus chemical industry, and has good economic and environmental benefits.
Description
technical field [0001] The invention relates to phosphate fertilizer produced by leaching phosphate rock with nitric acid, in particular to highly water-soluble nitrophosphate fertilizer. Background technique [0002] It is a well-known technology to decompose phosphate rock with nitric acid and produce nitrophosphate fertilizer by freezing method or mixed acid method. Ma Buzhen introduced it in the article "Production Status and Development of Nitrophosphate Fertilizer" ("Henan Chemical Industry" 2001, No. 6, pp. 5-7) The current production status of nitrophosphate fertilizer was analyzed, and the technological characteristics of freezing method and mixed acid method were analyzed. Traditional nitrophosphate fertilizers use the freezing method to separate the calcium in the acid solution in the form of calcium nitrate tetrahydrate crystals, and then use ammonia to neutralize the remaining liquid to produce partially soluble nitrophosphate fertilizers. There are not many pa...
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IPC IPC(8): C05G1/00C01F11/18
Inventor 张钦顾春光
Owner GUIZHOU RES INST OF CHEM IND