CN211570124U - Equipment for removing harmful elements in wet-process phosphoric acid and derivative products thereof - Google Patents
Equipment for removing harmful elements in wet-process phosphoric acid and derivative products thereof Download PDFInfo
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- CN211570124U CN211570124U CN201921454876.8U CN201921454876U CN211570124U CN 211570124 U CN211570124 U CN 211570124U CN 201921454876 U CN201921454876 U CN 201921454876U CN 211570124 U CN211570124 U CN 211570124U
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Abstract
The utility model relates to a wet process phosphoric acid treatment technical field specifically is an equipment that is used for wet process phosphoric acid and derived product harmful element desorption. The utility model comprises a phosphorus pentasulfide bin, a phosphorus pentasulfide metering and conveying system, a rotary table filter, a dilute phosphoric acid clarifying tank, a dilute phosphoric acid storage tank, a dilute phosphoric acid concentration removal system, a fluorine tower of a wet phosphoric acid extraction fluorine absorption system, a fluorine absorption system production iodine-containing fluosilicic acid iodine-removing oxidation-adding material of a wet phosphoric acid extraction fluorine absorption systemThe reduction-enrichment-oxidation recovery device and the wet-process phosphoric acid extraction fluorine absorption system rear system can fully perform two-stage harmful element removal reaction, remove heavy metal cation harmful elements in the wet-process phosphoric acid into a phosphogypsum slag yard, recover byproduct hydrogen sulfide gas as an iodine molecule reducing agent in extraction tail gas, and reduce liquid SO in an iodine recovery system2And (4) raw material consumption.
Description
Technical Field
The utility model relates to a wet process phosphoric acid treatment technical field specifically is an equipment that is used for wet process phosphoric acid and derived product harmful element desorption.
Background
At present, in the production process of phosphate fertilizer, because concentrated phosphoric acid contains a certain amount of arsenic (about 50-60 ppm), the content of arsenic in phosphate fertilizer products is about 80ppm, and a certain gap exists between the arsenic content in I type product execution standards and the arsenic content in foreign product quality execution standards, wherein the As% is less than or equal to 0.005, and the As% is less than or equal to 0.002.
At present, the industrial dearsenification of phosphoric acid and its derivative products is mainly used for dearsenification of food-grade or electronic-grade related products, the dearsenification objects are mostly thermal phosphoric acid and its related products or wet phosphoric acid purified acid and its related products, and researches or industrial experiments for directly dearsenifying wet phosphoric acid and its derivative products are rarely reported. Most of the products are dearsenized in phosphoric acid, and most of the methods are to dearsenize phosphoric acid to obtain the required products or to reproduce subsequent products.
Therefore, it is urgent to find a device for removing harmful elements such as arsenic in wet-process phosphoric acid and its derivatives, which can fully remove the harmful elements such as arsenic in the production process of wet-process phosphoric acid, reduce the content of the harmful elements such as arsenic in the prepared phosphate fertilizer, has simple and convenient operation, does not introduce new impurities, and does not generate three wastes.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem in the prior art, the utility model provides an equipment that is used for wet process phosphoric acid and its derived product harmful element desorption, specifically as follows:
the equipment for removing harmful elements in wet-process phosphoric acid and derived products thereof comprises a phosphorus pentasulfide bin and phosphorus pentasulfide metering and conveyingThe system comprises a rotary table filter, a dilute phosphoric acid clarifying tank, a dilute phosphoric acid storage tank, a dilute phosphoric acid concentrating system, a fluorine tower of a wet-process phosphoric acid extraction fluorine absorption system, an iodine-containing fluosilicic acid iodine removing oxidation-reduction-enrichment-oxidation recovery device produced by the wet-process phosphoric acid extraction fluorine absorption system, and a wet-process phosphoric acid extraction fluorine absorption system rear system, wherein a phosphorus pentasulfide bin is respectively connected with the wet-process phosphoric acid extraction tank and the dilute phosphoric acid clarifying tank through a phosphorus pentasulfide metering and conveying system; the bottom of the wet-process phosphoric acid extraction tank is connected with a rotary table filter, the mixture at the bottom is sent to the rotary table filter for filtering, the upper part of the wet-process phosphoric acid extraction tank is connected with a fluorine tower of a fluorine absorption system for extracting fluorine by wet-process phosphoric acid, and the generated H is2The S gas is sent to a fluorine tower; the rotary table filter is connected with a filter residue phosphogypsum deslagging field and a dilute phosphoric acid clarifying tank, filter residue flows to the filter residue phosphogypsum deslagging field, and filtrate flows to the dilute phosphoric acid clarifying tank; the bottom of the dilute phosphoric acid clarifying tank is connected with the wet-process phosphoric acid extraction tank for conveying the bottom sediment back to the wet-process phosphoric acid extraction tank, the upper part of the dilute phosphoric acid clarifying tank is connected with the dilute phosphoric acid storage tank for conveying the clear liquid to the dilute phosphoric acid storage tank, the top of the dilute phosphoric acid clarifying tank is connected with a fluorine tower of a wet-process phosphoric acid extraction fluorine absorption system, and the generated H2The S gas is sent to a fluorine tower; the dilute phosphoric acid storage tank is connected with the dilute phosphoric acid concentration removal system, and dilute phosphoric acid is sent to be concentrated; the lower part of a fluorine tower of the wet-process phosphoric acid extraction fluorine absorption system is connected with an iodine oxidation-reduction-enrichment-oxidation recovery device for producing the iodine-containing fluosilicic acid by the wet-process phosphoric acid extraction fluorine absorption system so as to recover iodine molecular resources; the upper part is connected with a system behind the wet-process phosphoric acid extraction fluorine absorption system to recover tail gas.
Preferably, the wet-process phosphoric acid extraction tank consists of a reaction tank and a digestion tank, wherein the reaction tank consists of one to six zones, and the digestion tank consists of seven to nine zones. The district sets up a stirring rake in the extraction tank, the district sets up the limit groove that the cooling ground paste got into, six districts set up the limit groove of ground paste axial-flow pump interface, two three district upper portions respectively set up a mixed tee bend interface, six districts set up the overflow mouth that the ground paste got into the digestion tank, one district to two districts, two districts to three districts, three district to four districts, four districts to five districts, five districts to six districts, seven districts to eight districts, partition wall sets up the gate-type opening that the extraction reaction ground paste circulated between eight districts to nine districts, each district's inside lining rubber slab barrier, the outer lining carbon brick anticorrosive coating of rubber slab. And waste gas outlets are arranged at the upper parts of the three zones and the four zones.
Preferably, a low-level flash cooling circulating pump is further arranged in a sixth area of the reaction tank in the wet-process phosphoric acid extraction tank.
Preferably, the phosphorus pentasulfide bin is connected with the three areas and the four areas of the wet-process phosphoric acid extraction tank through a phosphorus pentasulfide metering and conveying system.
Preferably, the bottom of the wet-process phosphoric acid extraction tank is connected with the rotary table filter through a slurry pump.
Preferably, the bottom of the dilute phosphoric acid clarifying tank is connected with the third zone of the wet-process phosphoric acid extraction tank.
Preferably, the bottom of the dilute phosphoric acid clarifying tank is connected with the wet-process phosphoric acid extraction tank through a slurry pump.
Preferably, the dilute phosphoric acid storage tank is connected with the dilute phosphoric acid de-concentration system through a phosphoric acid pump.
Preferably, the device for producing iodine-containing fluosilicic acid through the wet-process phosphoric acid extraction fluorine absorption system, namely the iodine oxidation-reduction-enrichment-oxidation recovery device, comprises an iodine ion-containing fluosilicic acid settling tank and an iodine recovery system.
At present, the industrial dearsenification of phosphoric acid and its derivative products is mainly used for dearsenification of food-grade or electronic-grade related products, the dearsenification objects are mostly thermal phosphoric acid and its related products or wet phosphoric acid purified acid and its related products, and researches or industrial experiments for directly dearsenifying wet phosphoric acid and its derivative products are rarely reported. Most of the products are dearsenized in phosphoric acid, most of the methods are to dearsenize phosphoric acid to obtain the required products or reproduce subsequent products, and the dearsenization methods are mainly divided into the following methods:
the technical principle of harmful element removal is as follows:
as is H in concentrated phosphoric acid3AsO4Or H3AsO3Exist in the form of (1), both of which can react with S2–Formation of insoluble As compounds2S3The reaction is as follows:
H3AsO4+H2S＝H3AsO3+S↓+H2O
2H3AsO3+3H2S＝As2S3↓+6H2O
wherein H3AsO4First with H2S reaction to H3AsO3Then H3AsO3Can be combined with H2S reaction to insoluble As2S3Precipitation, indicating H in phosphoric acid3AsO4The content of (A) affects H2The required amount of S.
In dearsenification of phosphoric acid, P2S5The following reaction can occur in the presence of water:
P2S5+H2O＝H3PO4+H2S
P2S5production of H in an aqueous environment3PO4And H2S, not only generating S-containing2–Compound (II) of (1)2S, without introducing other impurities, so that P2S5Is an excellent dearsenization agent. However, concentrated phosphoric acid contains a certain amount of Cr, Pb, Cu, etc., and these heavy metal cations and S form insoluble precipitates, and the reaction is as follows:
2Cr3++3S2–＝Cr2S3↓
Cu2++S2–＝CuS↓
Pb2++S2–＝PbS↓
therefore, part of heavy metal cations can be removed while dearsenifying, i.e. the content of other heavy metal ions can influence P2S5The amount of consumption of (c).
However, during the reaction, P2S5Decomposing the generated H2S is hardly soluble in water, has a solubility in water of only 0.58g/100g of water, and has a lower solubility in phosphoric acid, so that P is hardly soluble in water2S5After the addition of the reaction solution system, there may be a part of H2The S gas overflows.
The technical principle of reducing and absorbing gas-phase iodine molecules is as follows:
by means of H2S is taken as a reducing agent to react with iodine molecules blown out from the dilute phosphoric acid and the fluosilicic acid as follows:
4I2+H2S+4H2O＝H2SO4﹢8HI
taking Kaiyang phosphate ore as an example, in a wet-process phosphoric acid process, about 60% of associated iodine resources enter dilute phosphoric acid, about 25% enter an extraction tail gas washing and absorbing system, wherein the dilute phosphoric acid contains about 40mg/kg of iodine, and the extraction tail gas washing and absorbing solution-fluosilicic acid contains about 25mg/kg of iodine. By means of H2O2As oxidant 23% (P)2O5) The iodine ions in the dilute phosphoric acid and 10 percent of fluosilicic acid are catalytically oxidized into iodine molecules, and the iodine molecules in the dilute phosphoric acid and the fluosilicic acid are blown into absorption liquid-SO by an air extraction blowing method in a gas phase2In aqueous solution, by SO2Reducing iodine molecules into iodine ions by the reducing agent, and reducing H after the concentration of the iodine ions in the absorption liquid reaches a certain value2O2And (3) introducing an oxidant into the absorption liquid, oxidizing the iodide ions into iodine molecules again, and performing liquid-solid separation to obtain an iodine product. The process of recovering the phosphorus ore associated iodine comprises the working procedures of catalytic oxidation of iodide ions, air extraction of iodine molecules, reduction and absorption of the iodine molecules and separation of iodine products.
At present, one of the larger raw materials consumed by the iodine recovery device of wet-process phosphoric acid is sulfur dioxide, and the sulfur dioxide is generally purchased from bottled liquid sulfur dioxide, the concentration of the sulfur dioxide is 99.9 percent, and the pressure of a gas cylinder is 0.3-0.5MPa, and each bottle of sulfur dioxide gas is about 1 ton. Liquid sulfur dioxide is decompressed by the buffer tank and then is introduced into a using point of the device by a pipeline to enter a system for use. In order to avoid safety and environmental protection risks, the stock is not more than 20 tons. When the field is used up, the forklift is transported from the storage warehouse to the field for replacement. At present, no liquid sulfur dioxide producer in Guizhou province needs to purchase outside provinces, field production interruption is caused when long-distance transportation is carried out or the producer cannot supply goods in time, and on the other hand, bottled liquid sulfur dioxide is high in concentration and pressure, belongs to a pressure container, and is high in transportation and internal storage safety and environmental protection risks. The price of the adopted liquid sulfur dioxide is higher, and the purchase price of the liquid sulfur dioxide in the market is 5700 yuan per ton.
Because the sulfur dioxide in the iodine recovery device is mainly opened to the effect of iodine molecules in reducing wet-process phosphoric acid and fluosilicic acid, the requirement on the purity and the concentration of the sulfur dioxide is lower, therefore, the utility model discloses an equipment right H2Collecting S gas, and reacting with iodine molecules blown from dilute phosphoric acid and fluosilicic acid as a reducing agent to obtain iodine ions SO as to reduce liquid SO2The raw material consumption is reduced, and the visual pollution caused by red smoke emitted by extraction tail gas is reduced.
According to the principle of the reaction, the equipment provided by the application can fully perform two-stage harmful element removal reaction, remove heavy metal cation harmful elements in wet-process phosphoric acid to enter a phosphogypsum slag yard, recover byproduct hydrogen sulfide gas as an iodine molecule reducing agent in extraction tail gas, and reduce liquid SO in an iodine recovery system2And (4) raw material consumption.
Compared with the prior art, the utility model discloses the technological effect of creation is embodied in:
(1) the utility model discloses link to each other five sulphur phosphorus feed bins through five sulphur phosphorus measurement conveying system with wet process phosphoric acid extraction tank, rare phosphoric acid clarification tank respectively, be convenient for carry out the reaction of two-stage harmful element desorption.
(2) The utility model discloses link to each other rare phosphoric acid clarification tank bottom and wet process phosphoric acid extraction tank for carry back wet process phosphoric acid extraction tank with the bottom sediment, wet process phosphoric acid extraction tank bottom links to each other with the revolving stage filter, the revolving stage filter removes the slag yard with the filter residue ardealite, rare phosphoric acid clarification tank links to each other, the filter residue flows to the filter residue ardealite and removes the slag yard, send the bottom mixture to the revolving stage filter and filter, make heavy metal cation harmful elements such as arsenic and Cr, Pb, Cu wherein finally get into the ardealite slag yard with insoluble compound form.
(3) The utility model discloses dilute phosphoric acid clarification tank top and wet process phosphorusThe acid extraction fluorine absorption system is connected with a fluorine tower to generate H2S gas is sent to a monofluoro tower to be recycled and byproduct hydrogen sulfide gas is used as an iodine molecule reducing agent in extraction tail gas, SO that liquid SO in an iodine recycling system is reduced2And (4) raw material consumption.
(4) The lower part of a fluorine tower of the wet-process phosphoric acid extraction fluorine absorption system is connected with an iodine-removing oxidation-reduction-enrichment-oxidation recovery device for producing the iodine-containing fluosilicic acid by the wet-process phosphoric acid extraction fluorine absorption system so as to recover iodine molecule resources and reduce the visual pollution of red smoke emitted by extraction tail gas.
(5) The utility model discloses well wet process phosphoric acid extraction fluorine absorption system production iodine-containing fluosilicic acid removes iodine oxidation-reduction-enrichment-oxidation recovery unit comprises iodine ion fluorine silicic acid subsider and iodine recovery system to fully retrieve iodine molecule resource.
Drawings
Fig. 1 is the utility model discloses an equipment structure chart, wherein 1 is the phosphoric acid by wet process extraction tank, 2 is the sudden strain of a muscle cold system, 3 is the slurry pump, 4 is the revolving stage filter, 5 is the phosphorus pentasulfide feed bin, 6 is phosphorus pentasulfide measurement conveying system, 7 is the slurry pump, 8 is dilute phosphoric acid clarification tank, 9 is the dilute phosphoric acid storage tank, 10 is the phosphoric acid pump, 11 is the fluorine tower of phosphoric acid by wet process extraction fluorine absorption system, 13 is sulphuric acid system sulfur burner, 14, 15 are the phosphoric acid by wet process extraction fluorine absorption system after-system, 16 is the phosphoric acid by wet process extraction fluorine absorption system production iodine-containing fluosilicic acid deiodination oxidation-reduction-enrichment-oxidation recovery unit.
Detailed Description
The technical solution of the present invention is further defined below with reference to the specific embodiments, but the scope of protection is not limited to the description.
The utility model discloses an equipment that is used for phosphoric acid by wet process and derived product harmful element desorption, it contains phosphorus pentasulfide feed bin, phosphorus pentasulfide measurement conveying system, revolving stage filter, rare phosphoric acid clarification tank, rare phosphoric acid storage tank, rare phosphoric acid remove concentrated system, phosphoric acid by wet process extracts fluorine absorption system and is the fluorine tower, phosphoric acid by wet process extracts fluorine absorption system production iodine-containing fluosilicic acid and removes iodine oxidation-reduction-enrichment-oxidation recovery unit, phosphoric acid by wet process extracts fluorine absorption systemThe rear system, wherein a phosphorus pentasulfide bin is respectively connected with the wet-process phosphoric acid extraction tank and the dilute phosphoric acid clarifying tank through a phosphorus pentasulfide metering and conveying system; the bottom of the wet-process phosphoric acid extraction tank is connected with a rotary table filter, the mixture at the bottom is sent to the rotary table filter for filtering, the upper part of the wet-process phosphoric acid extraction tank is connected with a fluorine tower of a fluorine absorption system for extracting fluorine by wet-process phosphoric acid, and the generated H is2The S gas is sent to a fluorine tower; the rotary table filter is connected with a filter residue phosphogypsum deslagging field and a dilute phosphoric acid clarifying tank, filter residue flows to the filter residue phosphogypsum deslagging field, and filtrate flows to the dilute phosphoric acid clarifying tank; the bottom of the dilute phosphoric acid clarifying tank is connected with the wet-process phosphoric acid extraction tank for conveying the bottom sediment back to the wet-process phosphoric acid extraction tank, the upper part of the dilute phosphoric acid clarifying tank is connected with the dilute phosphoric acid storage tank for conveying the clear liquid to the dilute phosphoric acid storage tank, the top of the dilute phosphoric acid clarifying tank is connected with a fluorine tower of a wet-process phosphoric acid extraction fluorine absorption system, and the generated H2The S gas is sent to a fluorine tower; the dilute phosphoric acid storage tank is connected with the dilute phosphoric acid concentration removal system, and dilute phosphoric acid is sent to be concentrated; the lower part of a fluorine tower of the wet-process phosphoric acid extraction fluorine absorption system is connected with an iodine oxidation-reduction-enrichment-oxidation recovery device for producing the iodine-containing fluosilicic acid by the wet-process phosphoric acid extraction fluorine absorption system so as to recover iodine molecular resources; the upper part is connected with a system behind the wet-process phosphoric acid extraction fluorine absorption system to recover tail gas.
The wet-process phosphoric acid extraction tank consists of a reaction tank and a digestion tank, wherein the reaction tank consists of one to six zones, and the digestion tank consists of seven to nine zones. The district sets up a stirring rake in the extraction tank, the district sets up the limit groove that the cooling ground paste got into, six districts set up the limit groove of ground paste axial-flow pump interface, two three district upper portions respectively set up a mixed tee bend interface, six districts set up the overflow mouth that the ground paste got into the digestion tank, one district to two districts, two districts to three districts, three district to four districts, four districts to five districts, five districts to six districts, seven districts to eight districts, partition wall sets up the gate-type opening that the extraction reaction ground paste circulated between eight districts to nine districts, each district's inside lining rubber slab barrier, the outer lining carbon brick anticorrosive coating of rubber slab. And waste gas outlets are arranged at the upper parts of the three zones and the four zones.
And a low-level flash cooling circulating pump is arranged in a sixth area of the reaction tank in the wet-process phosphoric acid extraction tank.
And the phosphorus pentasulfide bin is connected with the three areas and the four areas of the wet-process phosphoric acid extraction tank through a phosphorus pentasulfide metering and conveying system.
And the bottom of the dilute phosphoric acid clarifying tank is connected with the third area of the wet-process phosphoric acid extraction tank.
And the bottom of the wet-process phosphoric acid extraction tank is connected with the rotary table filter through a slurry pump.
The bottom of the dilute phosphoric acid clarifying tank is connected with the wet-process phosphoric acid extraction tank through a slurry pump.
The dilute phosphoric acid storage tank is connected with a dilute phosphoric acid concentration removal system through a phosphoric acid pump.
The device for producing iodine-containing fluosilicic acid by the wet-process phosphoric acid extraction fluorine absorption system, which is used for removing iodine, oxidizing, reducing, enriching and oxidizing recovery, consists of an iodine ion-containing fluosilicic acid settling tank and an iodine recovery system.
When the device works, the phosphorus pentasulfide is respectively conveyed to a wet-process phosphoric acid extraction tank and a dilute phosphoric acid clarifying tank from a bin through a phosphorus pentasulfide metering and conveying system; the bottom of the dilute phosphoric acid clarifying tank is connected with the wet-process phosphoric acid extraction tank, the bottom sediment is conveyed back to the wet-process phosphoric acid extraction tank, the upper part of the dilute phosphoric acid clarifying tank is connected with a dilute phosphoric acid storage tank, clear liquid is conveyed to the dilute phosphoric acid storage tank, the top of the dilute phosphoric acid clarifying tank is connected with a fluorine tower of a wet-process phosphoric acid extraction fluorine absorption system, and the generated H2The S gas is sent to a fluorine tower; the bottom of the wet-process phosphoric acid extraction tank is connected with a rotary table filter, the mixture at the bottom is sent to the rotary table filter for filtering, the upper part of the wet-process phosphoric acid extraction tank is connected with a fluorine tower of a fluorine absorption system for extracting fluorine by wet-process phosphoric acid, and the generated H is2The S gas is sent to a fluorine tower; the rotary table filter is connected with a filter residue phosphogypsum deslagging field and a dilute phosphoric acid clarifying tank, filter residue flows to the filter residue phosphogypsum deslagging field, and filtrate flows to the dilute phosphoric acid clarifying tank; the dilute phosphoric acid storage tank is connected with the dilute phosphoric acid concentration removal system, and dilute phosphoric acid is sent to the dilute phosphoric acid concentration removal system to be concentrated; the lower part of a fluorine tower of the wet-process phosphoric acid extraction fluorine absorption system is connected with an iodine oxidation-reduction-enrichment-oxidation recovery device for producing the iodine-containing fluosilicic acid by the wet-process phosphoric acid extraction fluorine absorption system, so as to recover iodine molecular resources; the upper part is connected with a system behind the wet-process phosphoric acid extraction fluorine absorption system, and tail gas is recycled.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the technical solution of the present invention is not limited to the above-described embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.
Claims (9)
1. A device for removing harmful elements in wet-process phosphoric acid and a derivative product thereof is characterized by comprising a phosphorus pentasulfide bin, a phosphorus pentasulfide metering and conveying system, a rotary table filter, a dilute phosphoric acid clarifying tank, a dilute phosphoric acid storage tank, a dilute phosphoric acid concentrating system, a fluorine tower of a fluorine absorption system for wet-process phosphoric acid extraction, a device for producing iodine-containing fluosilicic acid iodine removal oxidation-reduction-enrichment-oxidation recovery by the fluorine absorption system for wet-process phosphoric acid extraction, and a system behind the fluorine absorption system for wet-process phosphoric acid extraction, wherein the phosphorus pentasulfide bin is respectively connected with the wet-process phosphoric acid extraction tank and the dilute phosphoric acid clarifying tank through the phosphorus pentasulfide metering and conveying system; the bottom of the wet-process phosphoric acid extraction tank is connected with a rotary table filter, the mixture at the bottom is sent to the rotary table filter for filtering, the upper part of the wet-process phosphoric acid extraction tank is connected with a fluorine tower of a fluorine absorption system for extracting fluorine by wet-process phosphoric acid, and the generated H is2The S gas is sent to a fluorine tower; the rotary table filter is connected with a filter residue phosphogypsum deslagging field and a dilute phosphoric acid clarifying tank, filter residue flows to the filter residue phosphogypsum deslagging field, and filtrate flows to the dilute phosphoric acid clarifying tank; the bottom of the dilute phosphoric acid clarifying tank is connected with the wet-process phosphoric acid extraction tank for conveying the bottom sediment back to the wet-process phosphoric acid extraction tank, the upper part of the dilute phosphoric acid clarifying tank is connected with the dilute phosphoric acid storage tank for conveying the clear liquid to the dilute phosphoric acid storage tank, the top of the dilute phosphoric acid clarifying tank is connected with a fluorine tower of a wet-process phosphoric acid extraction fluorine absorption system, and the generated H2The S gas is sent to a fluorine tower; the dilute phosphoric acid storage tank is connected with the dilute phosphoric acid concentration removal system, and dilute phosphoric acid is sent to be concentrated; the lower part of a fluorine tower of the wet-process phosphoric acid extraction fluorine absorption system is connected with an iodine oxidation-reduction-enrichment-oxidation recovery device for producing the iodine-containing fluosilicic acid by the wet-process phosphoric acid extraction fluorine absorption system so as to recover iodine molecular resources; the upper part is connected with a system behind the wet-process phosphoric acid extraction fluorine absorption system to recover tail gas.
2. The apparatus for removing harmful elements from wet-process phosphoric acid and its derivative products according to claim 1, wherein the wet-process phosphoric acid extraction tank consists of a reaction tank and a digestion tank, wherein the reaction tank consists of one to six zones, and the digestion tank consists of seven to nine zones; the inner area of the extraction tank is provided with a stirring paddle, the first area is provided with a side groove for cooling slurry to enter, the sixth area is provided with a side groove for a slurry axial-flow pump interface, the upper parts of the two and three areas are respectively provided with a mixed tee joint, the six area is provided with an overflow port for slurry to enter the digestion tank, the partition walls between the first area to the second area, the second area to the third area, the third area to the fourth area, the fourth area to the fifth area, the fifth area to the sixth area, the seventh area to the eighth area and the eighth area to the ninth area are provided with door-type openings for extracting reaction slurry to circulate, the inner lining of each area is provided with a rubber plate impermeable layer, a carbon brick anticorrosive layer is arranged outside the rubber plate; and waste gas outlets are arranged at the upper parts of the three zones and the four zones.
3. The apparatus for removing harmful elements from wet-process phosphoric acid and its derivative products according to claim 2, wherein the sixth zone of the reaction tank in the wet-process phosphoric acid extraction tank is further provided with a low-level flash cooling circulating pump.
4. The apparatus for removing harmful elements from wet-process phosphoric acid and its derivative products according to claim 2, wherein the phosphorus pentasulfide storage bin is connected with the three and four areas of the wet-process phosphoric acid extraction tank through a phosphorus pentasulfide metering and conveying system.
5. The apparatus for the removal of harmful elements from wet process phosphoric acid and its derived products according to claim 2, characterized in that the bottom of the dilute phosphoric acid clarifier tank is connected to the third zone of the wet process phosphoric acid extraction tank.
6. The apparatus for the removal of harmful elements from wet process phosphoric acid and its derived products according to claim 1, wherein the bottom of the wet process phosphoric acid extraction tank is connected to the rotary table filter by a slurry pump.
7. The apparatus for removing harmful elements from wet-process phosphoric acid and its derivative products according to claim 1, wherein the bottom of the dilute phosphoric acid clarifying tank is connected with the wet-process phosphoric acid extraction tank through a slurry pump.
8. The apparatus for wet phosphoric acid and its derivative harmful element removal according to claim 1, wherein the dilute phosphoric acid storage tank is connected with a dilute phosphoric acid de-concentration system through a phosphoric acid pump.
9. The apparatus for removing harmful elements from wet-process phosphoric acid and its derivative products according to claim 1, wherein the apparatus for recovering iodine from the iodine-containing fluorosilicic acid by oxidation-reduction-enrichment-oxidation in the production of iodine-containing fluorosilicic acid by the wet-process phosphoric acid extraction fluorine absorption system comprises an iodine ion-containing fluorosilicic acid settling tank and an iodine recovery system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110540179A (en) * | 2019-09-03 | 2019-12-06 | 贵州开磷集团矿肥有限责任公司 | Method and equipment for removing harmful elements in wet-process phosphoric acid and derivative products thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110540179A (en) * | 2019-09-03 | 2019-12-06 | 贵州开磷集团矿肥有限责任公司 | Method and equipment for removing harmful elements in wet-process phosphoric acid and derivative products thereof |
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