Method for producing byproduct gypsum of niter-sulfur-based compound fertilizer by decomposing phosphorite with nitric acid
A technology for nitrosulfur-based compound fertilizer and by-product gypsum, which is applied in fertilization devices, fertilizer mixtures, calcium/strontium/barium sulfate and other directions, can solve the problems of complicated operation, huge investment, high impurity content and cannot be comprehensively utilized, etc. The effect of high removal rate, simplified operation and reduced investment
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Embodiment 1
[0033] Embodiment 1: implement raw material: 1, phosphate rock powder: P 2 0 5 The content is 30.72%, CaO is 48.28%; 2. Nitric acid: concentration 70%; 3. Industrial ammonium sulfate: ammonia content 21%; 4. Industrial potassium sulfate: K 2 The O content is 52%.
[0034] The implementation process of the present invention comprises the following steps:
[0035] (1) After adding water to the phosphate rock powder, carry out acidolysis reaction with 70% nitric acid, the molar ratio of calcium ion and nitric acid in the phosphate rock is 1:3; the reaction temperature is 45° C., and the reaction is 0.5 hour.
[0036] (2) The crude acid hydrolyzate obtained in step (1) is filtered to remove acid insoluble matter and organic floating matter, and the filtrate is fine acid hydrolyzate.
[0037] (3) the refined acid hydrolyzate of step (2) is added to industrial ammonium sulfate and carry out metathesis reaction, and the ammonium sulfate add-on is by the mol ratio of calcium ion in...
Embodiment 2
[0040] Embodiment 2: implement raw material: 1, phosphate rock powder: P 2 o 5 The content is 29.85%, CaO is 48.30%; 2. Nitric acid: concentration 40%; 3. Industrial ammonium sulfate: ammonia content 21%; 4. Industrial potassium sulfate: K 2 The O content is 52%.
[0041] The implementation process of the present invention comprises the following steps:
[0042] (1) Add water to phosphate rock powder and carry out acid hydrolysis reaction with 40% nitric acid, the molar ratio of calcium ions and nitric acid in the phosphate rock is 1:2; the reaction temperature is 70° C., and react for 4 hours.
[0043] (2) The crude acid hydrolyzate obtained in step (1) is filtered to remove acid insoluble matter and organic floating matter, and the filtrate is fine acid hydrolyzate.
[0044] (3) the refined acid hydrolyzate of step (2) is added to industrial ammonium sulfate and carry out metathesis reaction, the ammonium sulfate add-on is by the mol ratio of calcium ion in ammonium sulfate...
Embodiment 3
[0047] Embodiment 3: implement raw material: 1, phosphate rock powder: P 2 o 5 The content is 31.05%, CaO is 47.65%; 2. Nitric acid: concentration 60%; 3. Industrial sulfuric acid: concentration 98%; 4. Industrial potassium sulfate: K 2 The O content is 52%.
[0048] The implementation process of the present invention comprises the following steps:
[0049] (1) Add water to phosphate rock powder and carry out acidolysis reaction with 60% nitric acid, the molar ratio of calcium ion and nitric acid in the phosphate rock is 1:2; the reaction temperature is 50° C., and the reaction is 1.5 hours.
[0050] (2) The crude acid hydrolyzate obtained in step (1) is filtered to remove acid insoluble matter and organic floating matter, and the filtrate is fine acid hydrolyzate.
[0051] (3) the refined acid hydrolyzate of step (2) is added industrial sulfuric acid to carry out metathesis reaction, and the sulfuric acid add-on is by the mol ratio 1.1: 1 of calcium ion in sulfate radical ...
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