CN104401959B - A kind of method filtering ardealite employing light phosphoric acid circulation washing - Google Patents
A kind of method filtering ardealite employing light phosphoric acid circulation washing Download PDFInfo
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- CN104401959B CN104401959B CN201410538395.0A CN201410538395A CN104401959B CN 104401959 B CN104401959 B CN 104401959B CN 201410538395 A CN201410538395 A CN 201410538395A CN 104401959 B CN104401959 B CN 104401959B
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Abstract
A kind of filter ardealite adopt light phosphoric acid circulation washing method, step is: a. filter material stock pump send here containing P2O5It is the extraction slip of 20～25%, after adding filter aid mixing, proceeds to phosphoric acid filtering area, filter ensures vacuum carries out vacuum filtration for-73～-68kpa, it is achieved solid-liquor separation, acquirement raw phosphoric acid, with finished product phosphoric acid pump, raw phosphoric acid delivered to phosphoric acid ageing tank；Etc.。In production process of the present invention, waste water uses at system internal recycle and digests, and arranges without outside waste water, and residue phosphogypsum adopts dry cinder discharging rubber conveyer to be delivered to gypsum stack, finally at ardealite surface earthing, reaches national requirements for environmental protection。
Description
Technical field
The present invention relates to sulfuric acid decomposition phosphorus ore and adopt two water law production technologies, use a kind of vacuum turntable filter to carry out the filtration of phosphoric acid extraction slime vacuum and produce wet method crude phosphoric acid。
Background technology
The industrial process of phosphoric acid has two classes: full-boiled process produces, and the product prepared is called hot phosphoric acid；Adopting electric furnace process to produce element phosphor, then reoxidize and make phosphoric acid, be also called electrothermal way phosphoric acid, another kind of is wet production, and with sulfuric acid decomposition phosphorus ore, main technique adopts two water laws, half water law, two water half water laws, and product is phosphoric acid by wet process。
In China's Wet-process Phosphoric Acid Production process, the filtration of phosphoric acid adopts rotary vacuum disk filter mostly, ardealite is after filtering, adopt three countercurrent washings, form light phosphoric acid, with a pump acid pump, light phosphoric acid is sent to light phosphoric acid storage tank, the reaction generation participating in sulphuric acid and rock phosphate in powder by entering extraction tank after adjusting flow extracts slip, remove heat in the process, in control extraction tank, temperature is less than 78～82 DEG C, then qualified slurry is filtered slip feed pump feeding rotary vacuum disk filter and carries out ardealite filtration, after three countercurrent washings, ardealite is sent into ardealite by pumping or employing dry method through rubber conveyer after starching again and is crossed stockyard, the light phosphoric acid that washing obtains is re-fed into light phosphoric acid storage tank, so circulation carries out phosphoric acid by wet process filtration。
Summary of the invention
The purpose of the present invention is precisely in order to overcome the defect that above-mentioned prior art exists, on above phosphoric acid filter base, cancel light phosphoric acid storage tank, set up two adjustment valves, and behind rotary vacuum disk filter phosphoric acid filtering area, increase acid tank of plusing fifteen, and the some of light phosphoric acid is sent directly into extraction tank, another part delivers to rotary vacuum disk filter by after valve, light phosphoric acid is carried out the washing in advance after ardealite filtration, then carries out four countercurrent washings by former technique。
Technical scheme is as follows:
A kind of method filtering ardealite employing light phosphoric acid circulation washing, feature of present invention is:
A. filter material stock pump send here containing P2O5It is the extraction slip of 20～25%, after adding filter aid mixing, proceeds to phosphoric acid filtering area, filter ensures vacuum carries out vacuum filtration for-73～-68kpa, it is achieved solid-liquor separation, acquirement raw phosphoric acid, with finished product phosphoric acid pump, raw phosphoric acid delivered to phosphoric acid ageing tank；
B. under the drive driving rotating disk, filter disc transfers to prewashing district, and the light phosphoric acid come with the pumping of light phosphoric acid washs in advance；With a sour pump, the washing of light phosphoric acid circulation is being ensured that vacuum-73～-68kPa carries out sucking filtration, filtrate is light phosphoric acid through the light phosphoric acid of filter disc after washing, deliver to the acid mixing device that phosphoric acid extraction groove is arranged, after controlling the flow of sulphuric acid and light phosphoric acid, fully mixing, enter extraction tank I scrubbing section；
C. under the drive driving rotating disk, filter disc transfers to the IIth scrubbing section, is ensureing that vacuum is-73～-68kpWith a sour pump, the II scrubbing section washing liquid that phosphorus acid content is 5～8% is circulated washing under the operating mode that a carries out sucking filtration, normal circulation is washed, II excessive scrubbing section washing liquid is sealed in I scrubbing section and washes descending liquid separation pipe；
D. under the drive driving rotating disk, filter disc transfers to the IIIth scrubbing section, add filter cloth wash water thick paste to be uniformly added at this, carry out III scrubbing section washing liquid circulation being washed with a sour pump under the operating mode of sucking filtration, normal circulation washing under ensureing vacuum, III excessive scrubbing section washing liquid is sealed in II and washes descending liquid separation pipe；
E. under the drive driving rotating disk, filter disc transfers to the IVth scrubbing section, ensureing that vacuum carries out sucking filtration for-73～-68kpa, the fluid-tight Water spray washing that vacuum pump is discharged is added with a noncorrosive pump, this fluid-tight water must adopt steam heating, make wash water temperature at 65 ± 5 DEG C, then IV excessive scrubbing section washing liquid is sealed in III and washes descending liquid separation pipe；
F. under the drive driving rotating disk, filter disc transfers to drying zone, ensureing that vacuum carries out sucking filtration for-73～-68kpa, water-soluble for filter cake phosphorus is dropped to < 0.3%, moisture < 30%；
G., under the drive driving rotating disk, filter disc moves on to material district, with spiral glassware, ardealite is drained into rubber conveyer, transports to ardealite storage yard。
Advantages of the present invention:
1. in production process, waste water digests in the use of system internal recycle, arranges without outside waste water, and residue phosphogypsum adopts dry cinder discharging rubber conveyer to be delivered to gypsum stack, finally at ardealite surface earthing, reaches national requirements for environmental protection。
2. filter aid consumption is little, and consumption is 50～60g/m3。
3. the water-soluble phosphorus of ardealite is low by 0.3%。
Accompanying drawing explanation
Fig. 1 is mineral processing circuit schematic diagram of the present invention。
Detailed description of the invention
Applicant makes full use of Dongchuan District, Yunnan Province district phosphate rock resource, relies on its industrial and civil construction and construction condition thereof to carry out this project construction, it is achieved the two sides concerned is had complementary advantages, resource-sharing, shared risks, benefit doulbe-sides' victory。The 100kt/a powdery monoammonium phosphate device technique that in June, 2012 is constructed and put into operation adopts " the external circulation ammoniation reactor economic benefits and social benefits slip concentrated spray fluid drying " of Sichuan University's exploitation。100kt/a wet phosphoric acid by dihydrate device adopts the dihydrate wet phosphoric acid flow process of Belgium's Pu Laiang (Prayon) 4 lattice square groove cryogenic vacuum cooling。Wherein ardealite filters the vacuum turntable filter selecting domestic advanced person, takes heat four circulated in countercurrent washing processs of light phosphoric acid of independent research。Detailed description of the invention is:
A. filter material stock pump P-2205 send here containing P2O5The using extracted phosphoric acid liquor of about about 20～25% and filter cloth wash water thick paste, after adding filter aid mixing, enter rotary vacuum disk filter HDZP-100 phosphoric acid filtering area by distributing device on filter, carry out vacuum filtration (vacuum pump P-2218)-73～-68kPa sucking filtration, realize solid-liquor separation, obtain raw phosphoric acid, with finished product phosphoric acid pump P-2211, raw phosphoric acid delivered to phosphoric acid ageing tank V-2301。
B. under the drive driving rotating disk, filter disc moves on to the Ith scrubbing section, with a pump acid pump P-2210,15% light phosphoric acid circulation is washed, under ensureing the operating mode that vacuum carries out sucking filtration, normal circulation washing, with a rephosphorization acid pump P-2212, excessive light phosphoric acid is delivered to acid mixing device R-2202A, B that phosphoric acid extraction groove is arranged, after controlling the flow of sulphuric acid and light phosphoric acid, fully mixing, enter extraction tank I scrubbing section。
C. under the drive driving rotating disk, filter disc moves on to the IIth scrubbing section, with a sour pump P-2213 by II washing liquid (5～8% phosphoric acid) circulation washing under ensureing the operating mode that vacuum carries out sucking filtration, normal circulation washing, II excessive washing liquid is sealed in I and washes descending liquid separation pipe。
D., under the drive driving rotating disk, filter disc moves on to the IIIth scrubbing section, will add filter cloth wash water thick paste at this and be uniformly added into,
With a sour pump P-2214 by III washing liquid circulation washing under ensureing the operating mode that vacuum carries out sucking filtration, normal circulation washing, III excessive washing liquid is sealed in II and washes descending liquid separation pipe。
E. under the drive driving rotating disk, filter disc moves on to the IVth scrubbing section, ensureing that vacuum carries out sucking filtration, fluid-tight water (the palpus employing steam heating that vacuum pump is discharged is added with a noncorrosive pump P-2215, make wash water temperature at 65 ± 5 DEG C) spray washing, IV excessive washing liquid is sealed in III and washes descending liquid separation pipe。
F. under the drive driving rotating disk, filter disc moves on to drying zone, ensureing that vacuum carries out sucking filtration, water-soluble for filter cake phosphorus is dropped to < 0.3%, moisture < 30%。
G., under the drive driving rotating disk, filter disc moves on to material district, with spiral glassware, ardealite is drained into rubber conveyer L-2201, transports to ardealite storage yard。
Claims (1)
1. filter the method that ardealite adopts the washing of light phosphoric acid circulation, it is characterized in that:
A. filter material stock pump send here containing P2O5It is the extraction slip of 20～25%, after adding filter aid mixing, proceeds to phosphoric acid filtering area, filter ensures vacuum carries out vacuum filtration for-73～-68kPa, it is achieved solid-liquor separation, acquirement raw phosphoric acid, with finished product phosphoric acid pump, raw phosphoric acid delivered to phosphoric acid ageing tank；
B. under the drive driving rotating disk, filter disc transfers to prewashing district, and the light phosphoric acid come with the pumping of light phosphoric acid washs in advance；With a sour pump, the washing of light phosphoric acid circulation is being ensured that vacuum-73～-68kPa carries out sucking filtration, filtrate is light phosphoric acid through the light phosphoric acid of filter disc after washing, deliver to the acid mixing device that phosphoric acid extraction groove is arranged, after controlling the flow of sulphuric acid and light phosphoric acid, fully mixing, enter extraction tank I scrubbing section；
C. under the drive driving rotating disk, filter disc transfers to the IIth scrubbing section, ensureing that vacuum is with a sour pump, the II scrubbing section washing liquid that phosphorus acid content is 5～8% is circulated washing under-73～-68kPa operating mode carrying out sucking filtration, normal circulation washing, II excessive scrubbing section washing liquid is sealed in I scrubbing section and washes descending liquid separation pipe；
D. under the drive driving rotating disk, filter disc transfers to the IIIth scrubbing section, add filter cloth wash water thick paste to be uniformly added at this, carry out III scrubbing section washing liquid circulation being washed with a sour pump under the operating mode of sucking filtration, normal circulation washing under ensureing vacuum, III excessive scrubbing section washing liquid is sealed in II and washes descending liquid separation pipe；
E. under the drive driving rotating disk, filter disc transfers to the IVth scrubbing section, ensureing that vacuum carries out sucking filtration for-73～-68kPa, the fluid-tight Water spray washing that vacuum pump is discharged is added with a noncorrosive pump, this fluid-tight water must adopt steam heating, make wash water temperature at 65 ± 5 DEG C, then IV excessive scrubbing section washing liquid is sealed in III and washes descending liquid separation pipe；
F. under the drive driving rotating disk, filter disc transfers to drying zone, carries out sucking filtration ensureing, water-soluble for filter cake phosphorus is dropped to < 0.3%, moisture < 30% under vacuum is for-73～-68kPa；
G., under the drive driving rotating disk, filter disc moves on to material district, with spiral glassware, ardealite is drained into rubber conveyer, transports to ardealite storage yard。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107539968A (en) * | 2017-10-16 | 2018-01-05 | 陕西煤化能源有限公司 | A kind of ammonia process of desulfurization solution and the system and method for gas washing in SA production fertilizer grade phosphoric acid |
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