CN104548754B - A kind of cleaning method of phosphorus ammonium filter cloth - Google Patents
A kind of cleaning method of phosphorus ammonium filter cloth Download PDFInfo
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- CN104548754B CN104548754B CN201410819425.5A CN201410819425A CN104548754B CN 104548754 B CN104548754 B CN 104548754B CN 201410819425 A CN201410819425 A CN 201410819425A CN 104548754 B CN104548754 B CN 104548754B
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Abstract
The invention discloses the cleaning method of a kind of phosphorus ammonium filter cloth, belong to production of ammonium phosphate technical field.The method includes: after the cleaning of surface filter cake and physics are cleared up, and uses phosphoric acid side-product prodan mother solution to soak filter cloth, soak time 0.5 3 hours, after having soaked, uses hot water to soak.The filter cloth that the method is cleaned is suitable with the normal filter cloth effect used.By inefficacy filter cloth again with can extend filter cloth use the cycle 1/3rd, namely can save the filter cloth expense of 1/3rd, effectively save cost.
Description
Technical field
The invention belongs to production of ammonium phosphate technical field, particularly to the cleaning method of a kind of phosphorus ammonium filter cloth.
Background technology
Filter cloth is the heart of pressure filter, pressure filter when filter pressing due to phosphor ammonium slurry in containing complicated tiny indissoluble
Inorganic salt, after averagely using 9 days as terylene 625 filter cloth of filter medium, will be blocked by tiny inorganic salt particle, makes
Become filter-cloth filtering efficiency to decline and be forced to change.Industrial ammonium phosphate per ton consumption filter cloth expense reach 28 yuan, and the filter cloth of actual spoilage and
The filter cloth shunk is few.Industrial ammonium phosphate filter cloth blocking failure cause analysis: I uses filter press in company's industrial ammonium phosphate workshop
Filtering the high temperature slip that 20wt% phosphoric acid neutralizes with ammonia, using terylene 625 long filament filter cloth as filter medium, this filter cloth is heat-resist,
Heat resisting temperature is up to 170 DEG C, and acid resistance is strong, and wearability is good, and strength is high, leaks fast, easy to clean.But in actual production process mistake
In, due to High Temperature High Pressure, and in industrial ammonium phosphate slip, insoluble salt is much the most miscellaneous, and new filter cloth just cannot filter after average use 9 days
And be forced to change.Blocking inefficacy filter cloth is carried out Treatment Analysis, with cleaning machine, blocking inefficacy filter cloth is cleaned up, cut at random
Three blocks of little filter clothes, are respectively put into equipped with being heated to 80 DEG C of immersions 3 hours in three 250ml beakers of 20wt% sulfuric acid solution,
Then filter cloth is taken out and clean, dry, by filtrate thickening filtration, solid formation is carried out chemical examination detection.Result such as table 1(filter cloth exists
Sulfuric acid solution soaks weightlessness) and table 2(inefficacy filter cloth in sulphuric acid, soaks weightlessness thing chemical analysis) shown:
Table 1
The insoluble matter granule blocking filter cloth as can be seen from Table 1 accounts for the 30% of filter cloth weight.
Table 2
The insoluble matter blocking filter cloth as can be seen from Table 2 is mainly calcium salt, the easy fouling of calcium salt, makes filter cloth blocking harden not
Can filter and make filter cloth lose efficacy.
Summary of the invention
For this practical situation, on the basis of analyzing filter cloth blocking inefficacy mechanism, the cleaning to blocking filter cloth
Tested, and tested the strainability of the filter cloth after cleaning, it is proposed that the cleaning of filter press inefficacy filter cloth and again
Utilize technique, by the filter cloth cleaned on probation aborning, can effectively extend the use cycle of filter cloth, thus reduce filter
The consumption of cloth, reduces the production cost of industrial ammonium phosphate.Failure cause analysis: the inefficacy filter cloth blocking of more than 80% causes,
The filter cloth inefficacy that there is also about 20% is that filter cloth is damaged and filter cloth shrinks and causes.Filter cloth breakage is due to two pieces of filter cloth joint chargings
Suture at Kou disconnects and causes material leakage not use, and also a reason is that sheet frame boss extrusion abrasion makes filter cloth through tram
Fracture causes material leakage not use, and to breakage, this situation can be carried out darning by filter cloth scavenger inspection can use again.Filter cloth
Contraction can not wrap up sheet frame and material leakage can not be used, and in use some shrinks terylene filter cloth, and reusing of filter cloth is washed
Wash, dry, contraction, terylene filter cloth shrinkage factor about 5% to 10% can be aggravated, use the contraction that can extend filter cloth with holding water
Cycle.We can take following Several Measures: 1, strengthens back goods and checks and accepts, it is ensured that filter cloth specification is many, and quantity is many.2, make
With front carrying out hot-water soak process.3, wet storage is carried out after cleaning.
For above-mentioned measure, embodiments provide the cleaning method of a kind of phosphorus ammonium filter cloth, the main pin of the method
Filter cloth to terylene material, the method includes: (clean as used through surface filter cake cleaning (high-pressure water pipe flushing) and physics cleaning
Machine carries out physical cleaning) after, (crystalline mother solution in prodan production process is with solid to use phosphoric acid side-product prodan mother solution
Liquid separation mother solution) filter cloth is soaked, soak time 0.5-3 hour, after having soaked, use hot water to soak.
Wherein, prodan mother solution soaking temperature is 15-80 DEG C.Wherein, the temperature of hot water is 50-80 DEG C.
Preferably, this method also includes: after using hot water to soak, and uses cleaning machine to clean, be dehydrated wet storage, in order to prolong
The use cycle of long filter cloth.
The filter cloth using the method to clean is suitable with the normal filter cloth effect used, and uses the method to clean and can manifest mistake
Effect filter cloth use again, and then can extend filter cloth use the cycle 1/3rd, namely can save the filter of 1/3rd
Cloth expense, has saved production cost effectively.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, the present invention will be made the most detailed below
Describe.
Industrial ammonium phosphate filtration filter cloth material is terylene 625 long filament filter cloth, and this filter cloth has a stronger acid resistance, but alkali resistance
More weak, soak 1 hour in weak base, polyester filament all ruptures, and is almost dissolved by alkali liquor.The medium additionally blocking filter cloth is inorganic
Salt, mainly ammonium phosphate calcium, ammoniomagnesium phosphate, ammonium phosphate ferrum aluminum and silicon dioxide etc..These salt acidic cleaners are compared
Good, the present embodiment has selected sulfuric acid solution, hydrochloric acid solution, hydrochloric acid+hydrofluoric acid solution, prodan mother solution to carry out cleaning and dipping respectively
Process the blocking filter cloth that lost efficacy.Result such as table 3(use variable concentrations dilute sulfuric acid add heat soaking), table 4(use soak with hydrochloric acid), table
5(use prodan mother solution soak), table 6(use 15% hydrochloric acid and 2% hydrofluoric acid solution soak) shown in:
Table 3
Table 4
Table 5
Table 6
We can see that use 10% silicate fluoride solution soaks effect preferably according to above experimental result, and soak time
The shortest.Meanwhile, prodan mother solution is used to soak cost minimum, easy to operate.
According to above experiment, we select prodan mother solution as inefficacy filter cloth abluent, through test of many times, determine
Use physical cleaning+Chemical cleaning method to blocking filter cloth be carried out, method includes: the cleaning of surface filter cake, physical cleaning,
The immersion of hexafluosilicic acid mother solution, hot water injection and wet storage are stand-by.
Specifically include: blocking filter cloth is upper and lower at filter press, is cleaned out by filter cloth surface filter cake by high-pressure water pipe,
Pulling down blocking filter cloth and carry out physical cleaning with industrial washer again, such top layer all cleans up.Again blocking filter cloth is put into
The prodan mother solution of clarification carries out chemical immersion clean 1 hour.Then take out filter cloth hot-water soak once, then with industrial
It is stand-by that cleaning machine wash clean is dehydrated wet storage.
The Cleaning application effect of industrial ammonium phosphate blocking filter cloth and performance analysis, clean industrial ammonium phosphate according to above cleaning
Blocking inefficacy filter cloth 90, produces at industrial ammonium phosphate and tries out on filter press, and filter effect is more as shown in table 7:
Table 7
As can be seen from the above table: the filter cloth of cleaning is suitable with the normal filter cloth effect used.By using again of inefficacy filter cloth
Can extend filter cloth uses 1/3rd of the cycle.
The detailed description of the invention of present invention described above, is not intended that limiting the scope of the present invention.Any basis
Various other that the technology design of the present invention is made change and deformation accordingly, should be included in the guarantor of the claims in the present invention
In the range of protecting.
Claims (2)
1. the cleaning method of a phosphorus ammonium filter cloth, it is characterised in that: including: after the cleaning of surface filter cake and physics are cleared up, adopt
Soaking filter cloth with phosphoric acid side-product prodan mother solution, soaking temperature is 15-80 DEG C, soak time 0.5-3 hour, leaching
After finishing into, using hot water to soak, the temperature of hot water is 50-80 DEG C.
The cleaning method of phosphorus ammonium filter cloth the most according to claim 1, it is characterised in that described method also includes: adopt
After soaking with hot water, cleaning machine is used to clean, be dehydrated wet storage.
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| CN201410819425.5A CN104548754B (en) | 2014-12-25 | 2014-12-25 | A kind of cleaning method of phosphorus ammonium filter cloth |
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| CN201410819425.5A CN104548754B (en) | 2014-12-25 | 2014-12-25 | A kind of cleaning method of phosphorus ammonium filter cloth |
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| CN104548754A CN104548754A (en) | 2015-04-29 |
| CN104548754B true CN104548754B (en) | 2016-09-21 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105176714B (en) * | 2015-07-15 | 2018-09-25 | 湖北瑞锶科技有限公司 | A kind of pmida canvas press cloth cleaning method |
| CN114712941A (en) * | 2022-04-12 | 2022-07-08 | 聚创(广东)智能装备有限公司 | Method for cleaning monoammonium phosphate filter cloth |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2598402B1 (en) * | 1986-05-07 | 1990-06-01 | Rhone Poulenc Chimie | METHOD FOR CLEANING FILTERING SURFACES |
| JPH09168710A (en) * | 1995-12-20 | 1997-06-30 | Tokuyama Corp | Regenerating method for filter cloth |
| CN102343168A (en) * | 2011-10-10 | 2012-02-08 | 瓮福（集团）有限责任公司 | Method for cleaning and descaling plate-and-frame type filter press |
| CN102746954A (en) * | 2012-07-23 | 2012-10-24 | 瓮福（集团）有限责任公司 | Cleaning agent for cleaning filter cloth for producing crystalline monoammonium phosphate by raffinate |
| CN102755973A (en) * | 2012-07-23 | 2012-10-31 | 瓮福（集团）有限责任公司 | Method for cleaning filtering cloth used in crystal MAP (monoammonium phosphate) production with raffinate |
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Denomination of invention: A cleaning method for filter cloth used in ammonium phosphate Effective date of registration: 20230731 Granted publication date: 20160921 Pledgee: Bank of China Limited Huanggang branch Pledgor: HUBEI XIANGYUN (Group) CHEMICAL Co.,Ltd. Registration number: Y2023420000318 |