CN-224208011-U - Device for circularly decomposing phosphorite by acidified ammonium sulfate

Abstract

The utility model relates to the technical field of phosphorite decomposition, and particularly provides an acidic ammonium sulfate circulating phosphorite decomposition device which comprises a pre-decomposition reaction tank, an acidolysis reaction tank, a first filter, a desulfurization reaction tank, a second filter, an acidolysis dephosphorization reaction tank and a third filter which are sequentially connected through pipelines and pumps, wherein the pre-decomposition reaction tank is provided with a phosphoric acid feeding port, the acidolysis reaction tank is provided with an acidic ammonium sulfate feeding port, filter residues of the first filter are conveyed to the acidolysis reaction tank through a conveying belt, the desulfurization reaction tank is provided with a phosphorite feeding port, filter residues of the second filter are conveyed to the pre-decomposition reaction tank through the conveying belt, and filter residues of the third filter are conveyed out of phosphogypsum through the conveying belt. The phosphate rock is decomposed by the acidified ammonium sulfate, so that a crude ammonium phosphate solution and phosphogypsum can be obtained, the product is continuously decontaminated by using raw materials, the sulfate radical content in the ammonium phosphate solution can be reduced, agricultural monoammonium can be directly produced at the downstream, and the phosphorus pentoxide content in the phosphogypsum can be reduced.

Inventors

• WEI TIANRONG
• LIU YANQIN
• YAN LING
• LIU ZHENZHEN
• ZHOU LINGLING
• Lu Bangyi
• LIAO QIUSHI
• XIAO LINBO
• HUANG QIN
• TIAN CHENGTAO
• MENG YANG
• ZHANG ZHIZI
• WANG KUN

Assignees

• 湖北三宁化工股份有限公司

Dates

Publication Date

20260508

Application Date

20250430

Claims (9)

1. 1. The device for circularly decomposing the phosphorite by the acidified ammonium sulfate is characterized by comprising a pre-decomposition reaction tank, an acidolysis reaction tank, a first filter, a desulfurization reaction tank, a second filter, an acidolysis dephosphorization reaction tank and a third filter which are sequentially connected through a pipeline and a pump, wherein the pre-decomposition reaction tank is provided with a phosphoric acid feeding port, the acidolysis reaction tank is provided with an acidified ammonium sulfate feeding port, filter residues of the first filter are conveyed to the acidolysis reaction tank through a conveyor belt, the desulfurization reaction tank is provided with a phosphorite feeding port, filter residues of the second filter are conveyed to the pre-decomposition reaction tank through the conveyor belt, and filter residues of the third filter are conveyed out of phosphogypsum through the conveyor belt.
2. 2. The device of claim 1, further comprising an acid buffer tank, wherein the filtrate outlet of the third filter is connected to the acid buffer tank feed inlet, and the acid buffer tank discharge outlet is connected to the acidolysis reaction tank feed inlet via a pipeline and a pump.
3. 3. The apparatus of claim 1, further comprising a crude ammonium phosphate solution buffer tank, wherein the filtrate outlet of the first filter is connected to a feed inlet of the crude ammonium phosphate solution buffer tank, and a discharge outlet of the crude ammonium phosphate solution buffer tank is connected to a feed inlet of the desulfurization reaction tank via a pipe and a pump.
4. 4. The device of claim 1, further comprising a phosphorus ammonium filtrate buffer tank, wherein the filtrate outlet of the second filter is connected to the feed inlet of the phosphorus ammonium filtrate buffer tank, and the discharge outlet of the phosphorus ammonium filtrate buffer tank is connected to the feed inlet of the acidolysis dephosphorization reaction tank through a pipeline and a pump.
5. 5. The apparatus of claim 4, wherein the ammonium phosphate filtrate buffer tank is further provided with an ammonium phosphate feed liquid extraction port.
6. 6. The device of claim 1, wherein the acidolysis dephosphorization reaction tank is further provided with a sulfuric acid feed port.
7. 7. The apparatus of any one of claims 1-6, wherein the first filter, the second filter, and the third filter are all plate and frame filters.
8. 8. The apparatus according to any one of claims 1 to 6, wherein the pre-decomposition reaction tank, the acidolysis reaction tank, the desulfurization reaction tank and the acidolysis dephosphorization reaction tank are closed containers, and a stirring assembly is arranged inside the closed containers.
9. 9. The apparatus of claim 8, wherein the drive means of the agitator assembly is an explosion-proof motor.

Description

Device for circularly decomposing phosphorite by acidified ammonium sulfate Technical Field The utility model belongs to the technical field of phosphorite decomposition, and relates to a device for circularly decomposing phosphorite by acidified ammonium sulfate. Background At present, the phosphorite is decomposed by a wet phosphoric acid process, namely phosphoric acid prepared by decomposing phosphorite by sulfuric acid, nitric acid or hydrochloric acid. Wet phosphoric acid produces a large amount of phosphogypsum, which contains, in addition to calcium sulfate dihydrate as a main component, incompletely decomposed phosphate ore, residual phosphoric acid, fluoride, acid insolubles, organic matters, and the like. The phosphorus pentoxide content in phosphogypsum is generally between 1% and 2%, when the phosphogypsum is deposited by rainwater, percolate with high phosphorus content is generated, if the percolate flows into natural water, the water eutrophication can be caused, the oxygen-enriched capability is weakened, the biological quantity in water is reduced, and the harm to water resources and ecological environment is caused. The higher the phosphorus content in phosphogypsum, the greater the pollution to the environment and the more difficult the treatment. With the increasing emphasis of environmental protection in China, how to reduce and utilize phosphorus resources in phosphogypsum is a problem that all people in the chemical industry need to think. In the process of producing the phosphorus compound fertilizer, sulfuric acid is mostly adopted to decompose phosphorite, on one hand, the sulfuric acid can provide acidic conditions to decompose phosphorite, and on the other hand, the sulfuric acid is used as a calcium precipitating agent to separate calcium in the phosphorite to generate phosphogypsum. Phosphogypsum can be used for preparing ammonium sulfate or potassium sulfate, and although the ammonium sulfate does not have the capability of decomposing phosphate rock, the phosphogypsum has the characteristic of simpler separation of phosphorus and calcium in the phosphate rock, and if the phosphogypsum is firstly subjected to acidification treatment and then is used for decomposing the phosphate rock to prepare the ammonium phosphate fertilizer, the problem of wet recycling of sulfur in the production of phosphorus chemical industry can be solved, the sulfuric acid consumption in the production is saved, and the byproduct sulfur resources of phosphorus chemical industry enterprises are effectively utilized. Disclosure of Invention The utility model provides a device for circularly decomposing phosphorite by acidified ammonium sulfate, which is characterized in that the phosphorite is decomposed by the acidified ammonium sulfate to obtain a crude ammonium phosphate solution and phosphogypsum, the product is continuously decontaminated by using raw materials, the sulfate radical content in the ammonium phosphate solution can be reduced, agricultural monoammonium can be directly produced at the downstream, and the phosphorus pentoxide content in the phosphogypsum can be reduced. The utility model provides an acidic ammonium sulfate circulating phosphate rock decomposing device, which comprises a pre-decomposing reaction tank, an acidolysis reaction tank, a first filter, a desulfurization reaction tank, a second filter, an acidolysis dephosphorization reaction tank and a third filter which are sequentially connected through a pipeline and a pump, wherein the pre-decomposing reaction tank is provided with a phosphoric acid feeding port, the acidolysis reaction tank is provided with an acidic ammonium sulfate feeding port, filter residues of the first filter are conveyed to the acidolysis reaction tank through a conveying belt, the desulfurization reaction tank is provided with a phosphate rock feeding port, filter residues of the second filter are conveyed to the pre-decomposing reaction tank through the conveying belt, and the filter residues of the third filter are conveyed out of phosphogypsum through the conveying belt. Further, the device also comprises an acid liquor buffer tank, a filtrate outlet of the third filter is connected to a feed inlet of the acid liquor buffer tank, and a discharge outlet of the acid liquor buffer tank is connected to a feed inlet of the acidolysis reaction tank through a pipeline and a pump. Further, the device also comprises a crude ammonium phosphate solution buffer tank, a filtrate outlet of the first filter is connected to a feed inlet of the crude ammonium phosphate solution buffer tank, and a discharge outlet of the crude ammonium phosphate solution buffer tank is connected to a feed inlet of the desulfurization reaction tank through a pipeline and a pump. Further, the device also comprises a phospham filtrate buffer tank, a filtrate outlet of the second filter is connected to a feed inlet of the phospham filtrate buffer tank, and a discharge outlet of the