Method for producing chloride-based compound fertilizer and co-producing gypsum through decomposing phosphorite with hydrochloric acid
A technology of by-product gypsum and compound fertilizer, which is applied in fertilization equipment, fertilizer mixture, calcium/strontium/barium sulfate, etc., can solve the problems such as difficulty in separating calcium chloride from phosphate rock and decomposition liquid, and achieve investment reduction and removal The effect of high efficiency and simplified operation
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[0016] Example 1: Implementation of raw materials: 1. Phosphate rock powder: P 2 0 5 The content is 20.33%, CaO is 27.64%; 2. Hydrochloric acid: 30% concentration; 3. Industrial ammonium sulfate: 21% ammonia content.
[0017] The implementation process of the present invention includes the following steps:
[0018] (1) The phosphate rock powder was added with water and then reacted with 30% hydrochloric acid. The molar ratio of calcium ion to hydrochloric acid in the phosphate rock was 1:2.2; the reaction temperature was 20°C and the reaction was carried out for 4 hours.
[0019] (2) Filter the crude acid hydrolysate obtained in step (1) to remove the acid-insoluble matter and organic floating matter therein, and the filtrate is refined acid hydrolysate.
[0020] (3) Adding the refined acid hydrolysis solution of step (2) to industrial ammonium sulfate for metathesis reaction, the addition amount of ammonium sulfate is based on the molar ratio of sulfate ion to calcium ion in the refin...
Example Embodiment
[0023] Example 2: Implementation of raw materials: 1. Phosphate rock powder: P 2 O 5 The content is 29.85%, CaO is 48.30%; 2. Hydrochloric acid: concentration is 20%; 3. Industrial ammonium sulfate: ammonia content is 21%.
[0024] The implementation process of the present invention includes the following steps:
[0025] (1) The phosphate rock powder is added with water and then reacted with 20% hydrochloric acid. The molar ratio of calcium ion to hydrochloric acid in the phosphate rock is 1:2; the reaction temperature is 60° C. and the reaction is carried out for 0.2 hours.
[0026] (2) Filter the crude acid hydrolysate obtained in step (1) to remove the acid-insoluble matter and organic floating substances therein, and the filtrate is refined acid hydrolysate.
[0027] (3) Adding the refined acid hydrolysis solution of step (2) to industrial ammonium sulfate for metathesis reaction, the addition amount of ammonium sulfate is based on the molar ratio of sulfate ion to calcium ion in t...
Example Embodiment
[0030] Example 3: Implementation of raw materials: 1. Phosphate rock powder: P 2 O 5 The content is 31.05%, CaO is 47.65%; 2. Hydrochloric acid: 30% concentration; 3. Industrial ammonium sulfate: 21% ammonia content.
[0031] The implementation process of the present invention includes the following steps:
[0032] (1) The phosphate rock powder was added with water and then reacted with 30% hydrochloric acid. The molar ratio of calcium ion to hydrochloric acid in the phosphate rock was 1:2.1; the reaction temperature was 50°C and the reaction was carried out for 1.5 hours.
[0033] (2) Filter the crude acid hydrolysate obtained in step (1) to remove the acid-insoluble matter and organic floating substances therein, and the filtrate is refined acid hydrolysate.
[0034] (3) Add the refined acid hydrolysate of step (2) to industrial ammonium sulfate for metathesis reaction. The amount of ammonium sulfate added is based on the molar ratio of sulfate ions to calcium ions in the refined aci...
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