CN102755973A - Method for cleaning filtering cloth used in crystal MAP (monoammonium phosphate) production with raffinate - Google Patents

Method for cleaning filtering cloth used in crystal MAP (monoammonium phosphate) production with raffinate Download PDF

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Publication number
CN102755973A
CN102755973A CN2012102538202A CN201210253820A CN102755973A CN 102755973 A CN102755973 A CN 102755973A CN 2012102538202 A CN2012102538202 A CN 2012102538202A CN 201210253820 A CN201210253820 A CN 201210253820A CN 102755973 A CN102755973 A CN 102755973A
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China
Prior art keywords
pipeline
cleaning
filter
valve
service sink
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CN2012102538202A
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Chinese (zh)
Inventor
李红林
段士东
陈翱翔
田仁道
何廷贵
黎雪飞
尹健
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Wengfu Group Co Ltd
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Wengfu Group Co Ltd
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Priority to CN2012102538202A priority Critical patent/CN102755973A/en
Publication of CN102755973A publication Critical patent/CN102755973A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a method for cleaning filtering cloth used in crystal MAP (monoammonium phosphate) production with raffinate. The method comprises the following steps: (1), preparing fluosilicic acid into 5 to 10 percent fluosilicic acid cleaning solution, so as to serve as standby; (2), connecting a pipeline from a cleaning tank to a slurry pipeline and into a filter pipeline, and connecting a pipeline from the filter liquor outlet pipeline of a filter to the cleaning tank, wherein media in the pipelines flow to valves to be controlled; and (3), during cleaning, heating the cleaning solution to 58 to 62 DEG C, closing a slurry valve and a filter liquor outlet valve, opening a cleaning valve, pumping the cleaning solution to the filter with a washing pump, carrying out on-line soaking for 20 to 30 min, opening cleaning tank inlet valve, recovering the cleaning solution into the cleaning tank, and cleaning up with water. The method has the advantages that the manufacturing technology is simple; the operation is convenient; product quality is prevented from being impacted; the conventional pipeline is protected from being corroded; the continuous production operation cannot be impacted to improve productivity; and filtering cloth loss caused by disassembled cleaning of the filtering cloth is reduced, so as to reduce the production cost.

Description

A kind of raffinate is produced the filter cloth cleaning method of crystal phosphoric acid one ammonium
Technical field
The present invention relates to the chemical products applied technical field, relate in particular to a kind of filter cloth on-line cleaning method of producing in the crystal phosphoric acid one ammonium process.
Background technology
Raffinate is the byproduct of purifying phosphoric acid, and impurity content is complicated, directly is used for producing other products, has a strong impact on product quality, must can guarantee product quality after treatment.In the processing procedure, the processing of filter cloth is absolutely necessary, and this will be related to the continuity of production cost and production process.Reaction below raffinate and impurities thereof will take place in the ammonia N-process:
1、（Fe，Al） 3（H 3O）H 8（PO 4） 6·6H 2O+3Mg（H 2PO 4） 2+H 2SiF 6=?3（Fe，Al）MgNH 4（HPO 4）2F 2+6NH 4H 2PO 4+SiO 2+5H 2O
2、6（Fe，Al） 3MgNH 4（HPO 4） 2F 2+（NH 4） 2SiF 6+4NH 3+2H 2O=6（Fe，Al）Mg（NH 4） 2（HPO 4） 2F 2+SiO 2?
3、（Fe，Al）NH 4H 8（PO 4） 6·6H 2O+2NH 3=5.5H 2O?+3（Fe，Al）NH 4（HPO 4） 2·0.5H 2O
4、、MgHPO 4+（NH 4） 2HPO 4+4H 2O=Mg（NH 4） 2（HPO 4） 2·4H 2O
5、、Mg（NH 4） 2（HPO 4） 2·4H 2O=MgNH 4PO 4·H 2O+NH 4H 2PO 4+3H 2O
Fouling is the material MgNH that above chemical reaction generates on the filter cloth 4PO 4H 2O, FeNH 4(HPO 4) 20.5H 2O, AlNH 4(HPO 4) 20.5H 2O, SiO 2.
Summary of the invention
The object of the present invention is to provide a kind of raffinate to produce the filter cloth cleaning method of crystal phosphoric acid one ammonium.
The filter cloth cleaning method that raffinate of the present invention is produced crystal phosphoric acid one ammonium comprises the steps:
(1) the first fluosilicic acid cleaning fluid of in service sink, using the byproduct fluosilicic acid of producing phosphoric acid by wet process to be mixed with 5-10% is subsequent use;
(2) connect a pipeline to slip pipeline from service sink and get on the filter pipeline, from filter filtrate (liquid pipeline, connect a pipeline and be connected with service sink again, pipeline medium flows to by valve control and realizes;
When (3) cleaning, first heated wash is closed slip valve and filtrate (liquid valve to 58-62 C night; Open wash-out valve, beat cleaning fluid to filter with washing pump, online immersion 20-30 minute; Open the service sink valve, used cleaning fluid be recovered into service sink, water cleans up again.
In the above-mentioned steps (3), when making cleaning fluid to filter, press 18.5L/m with washing pump 2Liquid measure is cleaned in control.
Principle of the present invention is: impurity all is phosphate and dibasic alkaliine on the filter cloth of raffinate production crystal phosphoric acid one ammonium, and fluosilicic acid is a strong acid, can generate soluble fluoride silicate with phosphate and dibasic alkaliine reaction.The digestion solution of fluosilicic acid can dissolve SiO 2.
The main chemical reactions that the present invention takes place is:
MgNH 4PO 4·H 2O+H 2SiF 6=?Mg?SiF 6+H 2O+NH 3+?H 3PO 4
2FeNH 4（HPO 4） 2·0.5H 2O?+3H 2SiF 6=?Fe 2(SiF 6) 3+H 2O+2NH 3+4?H 3PO 4
2AlNH 4（HPO 4） 2·0.5H 2O?+H 2SiF 6=?2Al 2(SiF 6) 3+H 2O+2NH 3+?4H 3PO 4
H 2SiF 6=SIF 4+2HF
6HF+SiO 2=?H 2SiF 6+2H 2O
The present invention has the following advantages:
(1) production technology is simple, is convenient to operation.
(2) do not influence product quality, do not corrode existing pipeline.
(3) help on-line cleaning, do not influence the continuous operation of production, improve the production production capacity.
(4) reduce the filter cloth loss that filter cloth causes when disassembly, cleaning, reduce production costs.
Description of drawings
Fig. 1 is that the pipeline of the inventive method connects sketch map.
The specific embodiment
Embodiment 1
Raffinate is produced the filter cloth cleaning method of crystal phosphoric acid one ammonium and is pressed following step:
(1) the byproduct fluosilicic acid of elder generation's usefulness production phosphoric acid by wet process in service sink is mixed with 5% fluosilicic acid cleaning fluid, and is subsequent use;
(2) connect a pipeline to slip pipeline from service sink and get on the filter pipeline, from filter filtrate (liquid pipeline, connect a pipeline and be connected with service sink again, pipeline medium flows to by valve control and realizes;
When (3) cleaning, first heated wash C at night to 58 closes slip valve and filtrate (liquid valve; Open wash-out valve, beat cleaning fluid to filter with washing pump, online immersion 20 minutes; Open the service sink valve, used cleaning fluid be recovered into service sink, water cleans up again.
In the above-mentioned steps (3), when making cleaning fluid to filter, press 18.5L/m with washing pump 2Liquid measure is cleaned in control.
Embodiment 2
Raffinate is produced the filter cloth cleaning method of crystal phosphoric acid one ammonium and is pressed following step:
(1) the byproduct fluosilicic acid of elder generation's usefulness production phosphoric acid by wet process in service sink is mixed with 10% fluosilicic acid cleaning fluid, and is subsequent use;
(2) connect a pipeline to slip pipeline from service sink and get on the filter pipeline, from filter filtrate (liquid pipeline, connect a pipeline and be connected with service sink again, pipeline medium flows to by valve control and realizes;
When (3) cleaning, first heated wash C at night to 62 closes slip valve and filtrate (liquid valve; Open wash-out valve, beat cleaning fluid to filter with washing pump, online immersion 30 minutes; Open the service sink valve, used cleaning fluid be recovered into service sink, water cleans up again.
In the above-mentioned steps (3), when making cleaning fluid to filter, press 18.5L/m with washing pump 2Liquid measure is cleaned in control.
Embodiment 3
Raffinate is produced the filter cloth cleaning method of crystal phosphoric acid one ammonium and is pressed following step:
(1) the byproduct fluosilicic acid of elder generation's usefulness production phosphoric acid by wet process in service sink is mixed with 8% fluosilicic acid cleaning fluid, and is subsequent use;
(2) connect a pipeline to slip pipeline from service sink and get on the filter pipeline, from filter filtrate (liquid pipeline, connect a pipeline and be connected with service sink again, pipeline medium flows to by valve control and realizes;
When (3) cleaning, first heated wash C at night to 60 closes slip valve and filtrate (liquid valve; Open wash-out valve, beat cleaning fluid to filter with washing pump, online immersion 25 minutes; Open the service sink valve, used cleaning fluid be recovered into service sink, water cleans up again.
In the above-mentioned steps (3), when making cleaning fluid to filter, press 18.5L/m with washing pump 2Liquid measure is cleaned in control.

Claims (2)

1. the filter cloth cleaning method of raffinate production crystal phosphoric acid one ammonium is characterized in that it comprises the steps:
(1) the first fluosilicic acid cleaning fluid of in service sink, using the byproduct fluosilicic acid of producing phosphoric acid by wet process to be mixed with 5-10% is subsequent use;
(2) connect a pipeline to slip pipeline from service sink and get on the filter pipeline, from filter filtrate (liquid pipeline, connect a pipeline and be connected with service sink again, pipeline medium flows to by valve control and realizes;
When (3) cleaning, first heated wash is closed slip valve and filtrate (liquid valve to 58-62 C night; Open wash-out valve; Beat cleaning fluid to filter with washing pump, after online immersion 20-30 minute, open the service sink valve; Used cleaning fluid be recovered into service sink, water cleans up again.
2. raffinate as claimed in claim 1 is produced the filter cloth cleaning method of crystal phosphoric acid one ammonium, it is characterized in that when making cleaning fluid to filter with washing pump, pressing 18.5L/m in the said step (3) 2Liquid measure is cleaned in control.
CN2012102538202A 2012-07-23 2012-07-23 Method for cleaning filtering cloth used in crystal MAP (monoammonium phosphate) production with raffinate Pending CN102755973A (en)

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CN2012102538202A CN102755973A (en) 2012-07-23 2012-07-23 Method for cleaning filtering cloth used in crystal MAP (monoammonium phosphate) production with raffinate

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104548754A (en) * 2014-12-25 2015-04-29 湖北祥云(集团)化工股份有限公司 Cleaning method for ammonium phosphate filter cloth
CN106215530A (en) * 2016-08-31 2016-12-14 瓮福达州化工有限责任公司 filter cloth cleaning method
CN107904607A (en) * 2017-11-09 2018-04-13 贵阳开磷化肥有限公司 A kind of cleaning method for producing industrial monoammonium tube still heater
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

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1767156A1 (en) * 1967-04-07 1971-08-19 Sincat Societa Ind Catanese S Process for the production of ammonium phosphates
US4236911A (en) * 1979-11-08 1980-12-02 Tennessee Valley Authority Purification and conversion of phosphoric acid to ammonium phosphates
US4443421A (en) * 1982-03-16 1984-04-17 Occidental Chemical Corporation Process for removing particulate impurities from aqueous phosphoric acid
US4557915A (en) * 1983-07-05 1985-12-10 Rhone-Poulenc Chimie De Base Production of phosphoric acid
US4857211A (en) * 1986-05-07 1989-08-15 Rhone-Poulenc Chimie Cleaning of filter surfaces
CN101073723A (en) * 2006-08-01 2007-11-21 杭州兴源过滤机有限公司 Mechanism and method for cleaning filter cloth of pressure filter
CN101733255A (en) * 2009-12-31 2010-06-16 贵州瓮福蓝天氟化工股份有限公司 On-line cleaning method of silicon dioxide filtering machine
CN101891504A (en) * 2010-07-26 2010-11-24 瓮福（集团）有限责任公司 Method for producing granular monoammonium phosphate with raffinate
CN201988240U (en) * 2011-01-28 2011-09-28 王辉锋 Closed type filter cloth cleaning device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1767156A1 (en) * 1967-04-07 1971-08-19 Sincat Societa Ind Catanese S Process for the production of ammonium phosphates
US4236911A (en) * 1979-11-08 1980-12-02 Tennessee Valley Authority Purification and conversion of phosphoric acid to ammonium phosphates
US4443421A (en) * 1982-03-16 1984-04-17 Occidental Chemical Corporation Process for removing particulate impurities from aqueous phosphoric acid
US4557915A (en) * 1983-07-05 1985-12-10 Rhone-Poulenc Chimie De Base Production of phosphoric acid
US4857211A (en) * 1986-05-07 1989-08-15 Rhone-Poulenc Chimie Cleaning of filter surfaces
CN101073723A (en) * 2006-08-01 2007-11-21 杭州兴源过滤机有限公司 Mechanism and method for cleaning filter cloth of pressure filter
CN101733255A (en) * 2009-12-31 2010-06-16 贵州瓮福蓝天氟化工股份有限公司 On-line cleaning method of silicon dioxide filtering machine
CN101891504A (en) * 2010-07-26 2010-11-24 瓮福（集团）有限责任公司 Method for producing granular monoammonium phosphate with raffinate
CN201988240U (en) * 2011-01-28 2011-09-28 王辉锋 Closed type filter cloth cleaning device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104548754A (en) * 2014-12-25 2015-04-29 湖北祥云(集团)化工股份有限公司 Cleaning method for ammonium phosphate filter cloth
CN106215530A (en) * 2016-08-31 2016-12-14 瓮福达州化工有限责任公司 filter cloth cleaning method
CN107904607A (en) * 2017-11-09 2018-04-13 贵阳开磷化肥有限公司 A kind of cleaning method for producing industrial monoammonium tube still heater
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

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Application publication date: 20121031