CN105752944A - Method combining phosphogypsum decomposition gas with wet process phosphoric acid production - Google Patents

Method combining phosphogypsum decomposition gas with wet process phosphoric acid production Download PDF

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CN105752944A
CN105752944A CN201610218461.5A CN201610218461A CN105752944A CN 105752944 A CN105752944 A CN 105752944A CN 201610218461 A CN201610218461 A CN 201610218461A CN 105752944 A CN105752944 A CN 105752944A
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gas
tail gas
phosphoric acid
wet
acid production
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龚家竹
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龚家竹
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/69—Sulfur trioxide; Sulfuric acid
    • C01B17/74—Preparation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/18—Phosphoric acid
    • C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
    • C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen

Abstract

The invention discloses a method combining phosphogypsum decomposition gas with wet process phosphoric acid production and belongs to the field of treatment and utilization of phosphogypsum. The method comprises the following steps: carrying out wet grinding on phosphorite to obtain phosphorite pulp; carrying out a single-conversion single-absorption process on phosphogypsum decomposition gas to obtain tail gas A containing SO2; predecomposing the tail gas A with the phosphorite pulp and absorbing the tail gas A by carrying out chemical reaction, so as to obtain tail gas B and phosphorus slurry containing sulphuric acid, and feeding the phosphorus slurry containing sulphuric acid into a wet process phosphoric acid production device as a raw material. By adopting the method disclosed by the invention, only the simple single-conversion single-absorption process needs to be carried out on the phosphogypsum decomposition gas, technology is shortened, equipment investment is reduced, production cost is reduced, emission concentration of SO2 can reach less than or equal to 40ppm, and resource utilization rate of sulfur is improved; and the aims of increasing economic benefits of a producer such as clean production, environmental protection, energy conservation, cost reduction, efficiency improvement and investment reduction and the advantage of obvious economic and social benefit are achieved.

Description

A kind of method of decomposing ardealite gas associating Wet-process Phosphoric Acid Production
Technical field
The present invention relates to the resource reutilization field of ardealite, the method particularly relating to a kind of decomposing ardealite gas associating Wet-process Phosphoric Acid Production.
Background technology
Ardealite is the primary solids refuse that high concentration phosphate fertilizer produces, and China's phosphorous chemical industry yield ranks first in the world, about 15,000,000 tons of (P of China's Wet-process Phosphoric Acid Production in 20152O5%), by-product ardealite 80,000,000 tons, simultaneously need to consume sulphuric acid output 40,000,000 tons, occupy No. 1 in the world.
For the problem solving ardealite bulk deposition, current processing method is usually and ardealite adopts reduction decomposition production sulphuric acid be used for recycling of phosphoric acid by wet process, the ardealite solid waste that so can reduce wet method phosphorous chemical industry is stacked and saves Sulphur ressource, is the beneficial way solving phosphorous chemical industry solid waste discharge；The chemical reaction of decomposing ardealite is as follows:
CaSO4+ 2C=CaS+2CO2↑(1)
3CaSO4+ CaS=4CaO+4SO2↑(2)
By the carbon dioxide containing 1/2 in the every 1 molecular oxidation sulfur gas of reaction equation (1) and (2), and the temperature in order to reach to decompose also will with non-sulfur material (such as carbon) burning to provide heat, not only cause the difference that gas forms, and sulfur oxide concentration is relatively low.
Bigger difference is there is in the sulfur oxide gas composition that above-mentioned ardealite reduction decomposition produces with traditional sulfur oxide composition adopting ferric sufide and brenstone roasting or burning.
Specifically, for the sulphuric acid of Wet-process Phosphoric Acid Production raw material, it is adopt sulfur-bearing raw material such as troilite, the sulfur oxygen in air to carry out roasting and burning and aoxidize and produce SO2Gas, its production principle is:
S+O2=SO2(3)
Produce sulfur oxide gas then through contact-catalytic oxidation by SO2Change into SO3, its production principle is:
2SO2+O2=2SO3(4)
The SO that catalytic oxidation obtains3Gas water absorbs and obtains sulphuric acid, and its production principle is:
2SO3+H2O=H2SO4(5)
By this production principle, the gas washing in SA production of early stage adopts and once converts once absorption (i.e. " one turn of one suction ") process, and production procedure is simple, and not only plant investment is low, and it is low to run producing cost；But the conversion ratio undertaken by reaction equation (4) (5) is low with absorbance, and the total conversion of sulfur oxide only has 95%, there are about the tail gas SO of 5% eliminating2Content is high, and acid mist weight is (containing SO3High), almost all eliminated.Modern gas washing in SA production presses the production principle of reaction equation (4) (5) equally, adopt twice multistage to convert what is called " double-absorption " the technique extracting sulfuric acid with twice absorption (i.e. " primary absorbent " and " final stage absorption "), its objective is SO burning generated2After twice multistage is catalytically converted into, improves the transformation efficiency of reaction (4) formula, and the purpose of twice absorption is improve the SO after converting with concentrated sulphuric acid equally3The absorption efficiency of gas, the total conversion of its sulfur oxide reaches 99.2%.Nearly reach the 800mg/m of country's exhaust emission standard3, but because of the severe situation of haze Yu environmental protection, within 2015, national tail gas standard drops to 400mg/m3, existing sulfuric acid apparatus needs supporting tail gas desulfurization device.
Therefore, the sulfur oxide gas that ardealite reduction decomposition produces is according to traditional " double-absorption " explained hereafter sulphuric acid, and the sulfur oxide that contrast troilite and sulfur roasting and burning produce has bigger difference with not enough, and the major defect existed is as follows:
One, the existence of the carbon dioxide produced because of reaction equation (1), sulfur oxide concentration is relatively low and unstable, conversion temperature in reaction equation (4) is inadequate, affect response speed, production capacity is caused to decline, need configuration electric furnace to be heated gas heating up, increase investment and producing cost；
Two, ardealite reduction decomposition produces in the Sulphur ressource circulation production device of sulphuric acid, and investing maximum is sulfuric acid apparatus, and it is the purifier of ardealite reduction decomposition gas that its installation cost includes 4: one, dedusting, pickling or washing；Two is that oxidizing sulfur dioxide becomes the consumption that twice multistage reforming unit specification of sulfur trioxide increases with catalyst to increase；Three is the absorption tower device specification increase of twice absorption；Four is the control expense that tail gas needs also exist for carrying out desulfurizer.
Three, due to the increase of " double-absorption " device specification, investment cost increases, and production run expense increases, and the sulphuric acid power of fan that especially SR brings increases, and its production cost is embodied in the increase of the electricity charge；Cause the unit gas washing in SA production cost production cost higher than other Sulphur ressource, be unfavorable for that the sulfur cycle phosphorous chemical industry of decomposing ardealite antacid produces.
Inventor is at patent No. ZL94111776.6 (patent name: a kind of method of Production By Sulfuric Acid Process phosphoric acid and solution containing phosphate), the principle that in successful Application phosphorus ore, carbonate and calcium phosphate can react with the sulphuric acid in phosphoric acid by wet process and phosphoric acid, solve the sulphuric acid of Wet-process Phosphoric Acid Production feed phosphate and the problem that lime consumption is high, significantly reduce the consumption of sulphuric acid and Calx raw material, and establish production of feedgrade phosphate technology today with domestic original creation.Thereafter at patent No. ZL97107676.6, (patent name: utilize the method that wet phosphate waste residue produces ammophos), economical solves a feed phosphate defluorination residues production difficult problem as fertilizer ammonium phosphate and Chemical Mixed Fertilizer basis phosphorus source fertilizer, makes production of feedgrade phosphate enterprise obtain huge economic and social profit.As the production development of phosphate rock resource complete utilization, calcium constituent in phosphorus ore and element silicon are directly or indirectly circulated economic processing or recycling again by inventor in the patents of invention such as patent No. ZL201310437466.3 (patent name: a kind of Gypsum Fibrosum produces the production method of cement joint production sulphuric acid) and patent No. ZL201410069087.8 (patent name: the method for the high silicon Phosphate Rock low silicon ardealite of acid by-product).
Chinese patent application (CN10467728) " a kind of deviate from sulfuric acid tail gas the method for sulfur dioxide ", adopts 20-60% phosphate ore pulp by sulfur dioxide in " double-absorption " sulfuric-acid production tail gas by 800mg/m3Drop to 100mg/m3Hereinafter, the phosphate ore pulp of sulfur dioxide absorption is for the raw material of phosphate reverse flotation de-magging operation.The method is only that phosphate ore pulp replaces lime white low content sulfur dioxide gas is absorbed, and the amount of sulfur dioxide absorption is relatively fewer deviating from the sulfur dioxide in flue gas as existing steam power plant employing Calx, and only for flotation of phosphate rock raw material；The investment of the circulation of the solution Wet-process Phosphoric Acid Production Sulphur ressource failed and sulfuric acid apparatus costliness and producing cost problem.
As ardealite reduction decomposition sulfur oxide gas for existing gas washing in SA production, convert and twice absorption according to twice multistage, because of the difference of sulfur oxide composition, need to increase electric furnace heat supply when converting, not only process units investment is big, and production run expense is also high, and tail gas needs also exist for administering.
Raising day by day and phosphorous chemical industry sustainable development generation technique requirement along with environmental requirement, ardealite produces as the wet method phosphorous chemical industry of resource circulation utilization, the circulation of Sulphur ressource and the realistic problem without ardealite discharge are in the urgent need to developing continuable advanced production technology, meet human survival and produce needs, accomplishing the harmony of " Kingsoft Yin Shan and blue montains and green waters ".
Summary of the invention
The purpose of the present invention is that the method providing a kind of decomposing ardealite gas associating Wet-process Phosphoric Acid Production, to solve the problems referred to above.
To achieve these goals, the technical solution used in the present invention is such that the method for a kind of decomposing ardealite gas associating Wet-process Phosphoric Acid Production, comprises the following steps:
(1), phosphorus ore is prepared phosphate ore pulp through wet grinding；
(2), decomposing ardealite gas inhale after technique through one turn one, obtain containing SO2Tail gas A；
(3), the phosphate ore pulp of tail gas A step (1) gained of step (2) gained is carried out predecomposition and chemical reaction absorbs, obtain tail gas B and vitriolated phosphorus slip, described tail gas B discharges, and described vitriolated phosphorus slip sends to wet-process phosphoric acid production plant as feedstock.
The present invention is by decomposing ardealite gas tail gas A after traditional a turn is inhaled, the phosphate ore pulp intended for prepared by phosphoric acid by wet process is directly adopted to carry out one or many absorption, making the Sulphur Dioxide in tail gas A is phosphate ore pulp predecomposition sulphuric acid, so that the phosphate ore pulp after absorbing can directly as the raw material of phosphoric acid by wet process, after namely inhaling one turn one, vent gas treatment and phosphoric acid by wet process extraction process unite two into one, playing the innovation effect of " killing two birds with one stone ", its reaction principle is:
The absorption reaction of the carbonate in phosphate ore pulp and " one turn of one suction " SO 2 tail gas
SO2+CaCO3+2H2O=CaSO3·2H2O↓+CO2↑(6)
SO2+MgCO3+2H2O=MgSO3·2H2O+CO2↑(7)
SO3+CaCO3+2H2O=CaSO4·2H2O↓+CO2↑(8)
SO3+MgCO3+2H2O=MgSO4·2H2O+CO2↑(9)
The absorption reaction of fluor-apatite and " one turn of one suction " SO 2 tail gas in phosphate ore pulp
6SO2+2Ca5F(PO4)3+18H2O=6CaSO3·2H2O↓+3Ca(H2PO4)2+CaF2↓(10)
6SO3+2Ca5F(PO4)3+18H2O=6CaSO4·2H2O↓+3Ca(H2PO4)2+CaF2↓(11)
SO2+Ca(H2PO4)2+3H2O=CaSO3·2H2O↓+2H3PO4(12)
SO3+Ca(H2FPO4)2+3H2O=CaSO4·2H2O↓+2H3PO4(13)
Calcium sulfite in predecomposition slip is oxidized
2CaSO3·2H2O+O2=2CaSO4·2H2O↓(14)
When going counter-current absorption one turn to inhale the SO 2 tail gas produced with phosphate ore pulp, final stage absorbs (if adopting two grades of absorptions, so " final stage absorption " i.e. " two grades of absorptions ") reaction such as reaction equation (6)-(9), the carbonate in phosphorus ore and absorbed SO relatively low in tail gas3And SO2Generate sulfate and sulphite, release CO2Gas, to primary absorbent (or " first order absorption ") because of carbonate minimizing in tail gas, and SO higher in tail gas3And SO2The mixture generating biphosphate calcium salt and calcium fluoride precipitate by reaction equation (10) and (11) is reacted with phosphorus ore, the calcium ion that dalcium biphosphate in solution dissociates very easily generates calcium sulfate with sulfur oxide reaction, so causes the SO in sulfuric-acid production tail gas3And SO2Almost all sponged；Phosphate ore pulp after absorption is pressed reaction equation (14) under the effect of air and is generated calcium sulfate, enters the extraction process of phosphoric acid by wet process together with unreacted phosphate ore pulp, with the sulphuric acid added, return slurry and return phosphoric acid and carry out Wet-process Phosphoric Acid Production by existing.
In the present invention, absorber can adopt single-stage, two-stage and plural serial stage with in parallel；The liquid of phosphate ore pulp: Gu the ratio scope at 1:1-5, it is preferred to 1:2-3, temperature room temperature, fineness was 80-200 order；Inhale sulfuric-acid production tail gas for one turn one and enter the SO of absorber2Original concentration is unrestricted, it is preferred to less than 1%；Gas inlet temperature is 60-100 DEG C, it is preferred to～80 DEG C；Circulation phosphorus slurry reaction temperature is 30-85 DEG C, it is preferred to 50～70 DEG C；The exhaust temperature of final stage absorber 60-80 DEG C, it is preferred to～60 DEG C, gets rid of SO in gas2Volumetric concentration 100PPM.
Certainly, technical scheme, except may be used for the process of decomposing ardealite gas, it is also possible to the vent gas treatment after inhaling in conventional sulphuric acid preparation process one turn, or the process containing SO 2 tail gas in other sources.
As preferred technical scheme: the liquid of step (1) gained phosphate ore pulp: Gu mass ratio is 1:(1-5), it is preferred to 25-40%；The fineness of the particles of phosphate ore pulp is 80-250 order.
As it is preferred that technical scheme: the liquid of step (1) gained phosphate ore pulp: Gu mass ratio is 1:(2-3)；The fineness of the particles of phosphate ore pulp is 120-150 order.
As preferred technical scheme: SO in described tail gas A2Concentration expressed in percentage by volume is less than 3%, and in step (3), tail gas A enters the temperature of phosphate ore pulp lower than 100 DEG C.
As it is preferred that technical scheme: SO in described tail gas A2Concentration expressed in percentage by volume is less than 1.5%, and in step (3), the temperature of tail gas A entrance phosphate ore pulp is 60-80 DEG C.
As preferred technical scheme: the predecomposition described in step (3) and chemical reaction are absorbed as one-level, two-stage or at least three grades.
As preferred technical scheme: the absorption pattern described in step (3) is adverse current and flows or adverse current flow blended absorbent.
It is to say, described predecomposition and chemical reaction absorber can be made single-stage according to the change of exhaust gas oxidation sulfur, bipolar and multistage, it is possible to single, double and multistage absorption device are carried out series connection and and are unified into an entirety；Absorber can be conventional adverse current and flow and adverse current flow blended absorbent device, it is possible to adopt the power wave absorber of existing double-absorption technique gas washing in SA production；
Described phosphate ore pulp adds and can all add from final stage, it is possible to add from every one-level respectively, and the slip after predecomposition absorption can from the first order out, it is possible to out go to absorption slip collecting tank from every one-level.
Inhale sulfuric acid tail gas A for one turn one and enter the SO of absorber2Original concentration is unrestricted, it is preferred to less than 1%；Gas inlet temperature is 60-100 DEG C, it is preferred to 80 DEG C；Circulation phosphorus slurry reaction temperature is 30-85 DEG C, it is preferred to 50～70 DEG C；The exhaust temperature of final stage absorber 60-80 DEG C, it is preferred to 60 DEG C.
Compared with prior art, it is an advantage of the current invention that: absorb owing to the tail gas after adopting phosphate ore pulp to adopt one turn of one suction to process in decomposing ardealite gas carries out decomposing, decomposing ardealite gas needs only to adopt simple one turn one to inhale technique, shorten technique, reduce plant investment, also just overcome and adopt traditional double-absorption to carry out the corresponding shortcoming processed；Save power consumption, reduce production cost；Decrease SO2Discharge capacity, SO2Concentration of emission can reach below 40ppm, element sulphur can return in phosphate fertilizer and Wet-process Phosphoric Acid Production, improves the resource utilization of sulfur；The while of the environmental benefit obtained, obtain significant economic benefit；For low concentration SO2Produce sulphuric acid and provide a kind of the most simply production method of practicality and process route, it is particularly well-suited to solid waste ardealite and produces the Optimum Economic production method that the Sulphur ressource of sulphuric acid and cement circulates, the effective approach of can yet be regarded as a best recycling economy method and maximum resource utilization.Reach to clean advantages such as producing, protect environment, the saving energy, reduction cost, raising efficiency, the economic benefit purpose reducing the increase Producers such as investment and economic and social benefit very notable.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
In figure: 1, grinding machine；2, phosphorus ore stock tank；3, phosphoric ore pulp pump；4, first absorber；5, primary cycle pump；6, secondary absorber；7, secondary cycle pump；8, phosphorus slurry vessel；9, phosphorus shurry pump.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1
The method of a kind of decomposing ardealite gas associating Wet-process Phosphoric Acid Production, such as Fig. 1, in the present embodiment, secondary absorber 6 and secondary cycle pump 7 are not involved in running, and only carry out single-stage absorption.Phosphorus ore is joined grinding machine 1, add water, grind to form the phosphate ore pulp that solid content is 40%, fineness of the particles 150 order, its composition is in Table 1, send into storage in phosphorus ore stock tank 2, with phosphoric ore pulp pump 3,20.0 ton hour phosphate ore pulps are delivered to first absorber 4, with primary cycle pump 5 slurry pumped in first absorber 4 and be circulated, additionally, after adopting one turn of one suction to process in decomposing ardealite gas, inhaling sulfuric acid tail gas A (its composition is in Table 2) by one turn one and deliver to first absorber 4, flow is 3218.6Kmol/h；Chemical reaction absorption is carried out in first absorber 4, after absorption reaction completes, the flow of emission B1 (its composition in Table 3) is 3703.5Kmol/h, its concentration converts the state emission standard of twice absorption lower than existing twice multistage, at below 300PPM；Phosphorus slip 14.2 ton hour (its composition is in Table 4) after removing sulfur dioxide absorption from absorber 4 per hour, sends to Wet-process Phosphoric Acid Production operation as phosphate ore pulp charge raw material.
The composition table (mass percent) of table 1 phosphorus ore and phosphate ore pulp
2 one turn one of table is inhaled sulfuric acid tail gas A and is formed table
Composition SO2 SO3 O2 CO2 H2O N2 Add up to
Volume % 0.32 0.04 8.99 5.59 0 85.02 100
Kmol/h 11.2 1.3 289.6 180 0.5 2736 3218.6
Table 3 emission B1 forms table
Table 4 absorbs phosphorus slip composition (mass percent) of sulfur oxide
Embodiment 2
A kind of method of decomposing ardealite gas associating Wet-process Phosphoric Acid Production, such as Fig. 1, phosphorus ore is quantitatively adding grinding machine 1, adds quantitative water, grind to form the phosphate ore pulp that solid content is 35%, its composition is in Table 5, fineness of the particles is 120 orders, sends into storage in phosphorus ore stock tank 2, with phosphoric ore pulp pump 3,30.0 ton hour phosphate ore pulps is delivered to secondary absorber 6, with secondary cycle pump 7 slip pumped in secondary absorber 6 and be circulated, and send here containing SO with getting rid of from first absorber 42Concentration is about the tail gas B1 of 300-320PPM and carries out counter current contacting and circulation at secondary absorber 6 and phosphate ore pulp, produces chemical reaction and absorbs；By the sulfur oxide concentration in the tail gas B after absorbing lower than 100PPM, its composition is in Table 7, and flow is 5178.42Kmol/h, removes from absorber 6 top row.The phosphorus slip removed from absorber 6 bottom row is sent into the feed pipe of primary cycle pump 5, and pump in first absorber 4 and be circulated, additionally, after adopting one turn of one suction to process in decomposing ardealite gas, one turn one is inhaled sulfuric acid tail gas A (its composition is in Table 6), and one turn one is inhaled in the tail gas A feeding first absorber 4 that gas washing in SA production is sent here, the flow of gas A is 4338.392Kmol/h, after in first absorber 4, circulated in countercurrent contact carries out chemical reaction absorption, the gas B1 of eliminating delivers in secondary absorber 6 and carries out two grades of absorptions by aforementioned；Bottom row is 20.48 ton hour except the phosphorus slip flow after absorption sulfur oxide, and its composition, in Table 8, sends to Wet-process Phosphoric Acid Production as phosphate ore pulp charge raw material.
Table 5 phosphate ore pulp composition table
6 one turn one of table is inhaled sulfuric-acid production tail gas A and is formed table
Composition SO2 SO3 O2 H2O N2 Add up to
Volume % 0.3872 0.0464 5.3758 0.0141 94.1765 100
Kmol/h 16.8 2.016 233.2235 0.6149 4085.7376 4338.392
Table 7 emission B forms table
Table 8 absorbs the phosphorus slip composition of sulfur oxide
Embodiment 3
A kind of method of decomposing ardealite gas associating Wet-process Phosphoric Acid Production, such as Fig. 1, phosphorus ore is quantitatively adding grinding machine 1, adds quantitative water, grind to form the phosphate ore pulp that solid content is 30%, fineness of the particles is 120 orders, its composition, in Table 9, is sent into storage in phosphorus ore stock tank 2, quantitatively 40.0 ton hour is delivered to secondary absorber 6 with phosphoric ore pulp pump 3, after two grades of absorbent recirculation pumps 7 start, will discharge containing SO from first absorber 42Concentration is about 150-100PPM gas B1 and carries out counter current contacting with phosphate ore pulp, carries out chemical reaction absorption in secondary absorber 6；By the sulfur oxide concentration in the gas B after absorbing lower than 100PPM (its composition is in Table 11), removing from absorber 6 top row, the flow of gas B is 6630.1662Kmol/h.The charging as primary cycle pump 5 supporting first absorber 4 of the phosphorus slip after sulfur is absorbed from what absorber 6 bottom row removed, additionally, after adopting one turn of one suction to process in decomposing ardealite gas, one turn one is inhaled sulfuric acid tail gas A (its composition is in Table 10) and sends in first absorber 4, the flow of tail gas A is 5252.9619Kmol/h, after carrying out chemical reaction absorption in first absorber 4, the gas B1 of eliminating delivers to and carries out two grades of absorptions in said second absorber 6；Bottom row is 23.68 ton hour except the phosphorus slip flow after absorption sulfur oxide, and its composition, in Table 12, sends to Wet-process Phosphoric Acid Production as phosphate ore pulp charge raw material.
Table 9 phosphate ore pulp composition table
10 1 turn one of table is inhaled sulfuric acid tail gas A and is formed table
After table 11 absorbs, emission B forms table
Table 12 absorbs the phosphorus slip composition of sulfur oxide
The foregoing is only presently preferred embodiments of the present invention, not in order to limit this present invention, any amendment made within all spirit in this present invention and principle, equivalent replacement and improvement etc., should be included within this protection scope of the present invention.

Claims (7)

1. the method for a decomposing ardealite gas associating Wet-process Phosphoric Acid Production, it is characterised in that comprise the following steps:
(1), phosphorus ore is prepared phosphate ore pulp through wet grinding；
(2), decomposing ardealite gas inhale after technique through one turn one, obtain containing SO2Tail gas A；
(3), the phosphate ore pulp of tail gas A step (1) gained of step (2) gained is carried out predecomposition and chemical reaction absorbs, obtain tail gas B and vitriolated phosphorus slip, described tail gas B discharges, and described vitriolated phosphorus slip sends to wet-process phosphoric acid production plant as feedstock.
2. the method for decomposing ardealite gas according to claim 1 associating Wet-process Phosphoric Acid Production, it is characterised in that: the liquid of step (1) gained phosphate ore pulp: Gu mass ratio is 1:(1-5)；The fineness of the particles of phosphate ore pulp is 80-250 order.
3. the method for decomposing ardealite gas according to claim 2 associating Wet-process Phosphoric Acid Production, it is characterised in that: the liquid of step (1) gained phosphate ore pulp: Gu mass ratio is 1:(2-3)；The fineness of the particles of phosphate ore pulp is 120-150 order.
4. the method for decomposing ardealite gas according to claim 1 associating Wet-process Phosphoric Acid Production, it is characterised in that: SO in described tail gas A2Concentration expressed in percentage by volume is less than 3%, and in step (3), tail gas A enters the temperature of phosphate ore pulp lower than 100 DEG C.
5. the method for decomposing ardealite gas according to claim 4 associating Wet-process Phosphoric Acid Production, it is characterised in that: SO in described tail gas A2Concentration expressed in percentage by volume is less than 1.5%, and in step (3), the temperature of tail gas A entrance phosphate ore pulp is 60-80 DEG C.
6. the method for decomposing ardealite gas according to claim 1 associating Wet-process Phosphoric Acid Production, it is characterised in that: the predecomposition described in step (3) and chemical reaction are absorbed as one-level, two-stage or at least three grades.
7. the method for decomposing ardealite gas according to claim 1 associating Wet-process Phosphoric Acid Production, it is characterised in that: the absorption pattern described in step (3) is adverse current and flows or adverse current flow blended absorbent.
CN201610218461.5A 2016-04-08 2016-04-08 Method combining phosphogypsum decomposition gas with wet process phosphoric acid production Pending CN105752944A (en)

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CN106276831A (en) * 2016-08-24 2017-01-04 湖北三宁化工股份有限公司 One utilizes SO2gas and phosphate ore pulp reaction produce the method and device of phosphoric acid
CN106744753A (en) * 2016-12-30 2017-05-31 贵州开磷集团股份有限公司 A kind of method of phosphorus ore stagewise de-magging
CN112723329A (en) * 2020-12-31 2021-04-30 云南云天化环保科技有限公司 Production method of wet-process phosphoric acid

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