CN1478721A - New method for producing feed additive MDCP using medium concentration wet method phosphoric acid - Google Patents
New method for producing feed additive MDCP using medium concentration wet method phosphoric acid Download PDFInfo
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- CN1478721A CN1478721A CNA021336784A CN02133678A CN1478721A CN 1478721 A CN1478721 A CN 1478721A CN A021336784 A CNA021336784 A CN A021336784A CN 02133678 A CN02133678 A CN 02133678A CN 1478721 A CN1478721 A CN 1478721A
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- phosphoric acid
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- defluorinate
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Abstract
A process for preparing the feed additive MDCP from the middle-concentration wet phosphoric acid includes such steps as using phosphorus ore slurry and sulfuric acid to extract coarse phosphoric acid, using the defluorinating agent, impurity removing agent and flocculant to purifying phosphoric acid by constant-pressure air floating and stripping, mixing with filtered cake of calcium hydrogen phosphate, and drying. Its advantages are high utilization rate of phosphorus, low cost and short period of production.
Description
Technical field
The present invention relates to the production method of a kind of fodder additives MDCP, definitely saying so relates to the method for a kind of Wet-process Phosphoric Acid Production MDCP, and particularly a kind of is the method for the middle concentration Wet-process Phosphoric Acid Production MDCP of 20-30% with phosphorus pentoxide content.
Background technology
MDCP is the mixture of secondary calcium phosphate and monocalcium phosphate, it is a kind of indispensable additive in the fodder production, advantage with secondary calcium phosphate and monocalcium phosphate, be not only applicable to general animal, also be applicable to aquatic animal and poultry demand,, therefore be subjected to users' welcome deeply because its price is lower than monocalcium phosphate to phosphorus, calcium, particularly after the China's entry into the WTO, this fodder additives has the market requirement widely.
At present, produce MDCP both at home and abroad and generally adopt two kinds of methods: the one, the thermal phosphoric acid method adds the secondary calcium phosphate filter cake, and the 2nd, thermal phosphoric acid adds wet method phosphoric acid and adds calcium phosphate salt.All adopting thermal phosphoric acid and defluorinated tricalcium phosphate as states such as the U.S., Japan is that phosphoric acid one, the dicalcium that raw material is made different phosphate content is MDCP, and China produces the producer of monocalcium phosphate, MDCP and adopts thermal phosphoric acid to add the production method of calcium hydrophosphate fodder mostly.These two kinds of methods are owing to be subjected to the influence of cost of material, and the production cost of monocalcium phosphate, MDCP is higher, makes corresponding being restricted of range of application of its production technology; At present, the problem of Wet-process Phosphoric Acid Production MDCP is to do the flocculation agent defluorinate with Paris white to precipitate the loss of removal of impurities, phosphorus amount big, and fodder/ fertilizer ratio is low, and solid state reaction needs slaking, take up an area of big, equipment is many, cost is high.
Summary of the invention
The objective of the invention is to: provide a kind of and can directly use the mid low grade phosphate rock phosphoric acid extraction and purify, directly carry out that solid-liquid phase reaction is produced MCDP, process is easy to control, the reaction times is short, the fodder/ fertilizer ratio height of phosphorus, floor space is little, equipment is few, the novel method of the middle concentration Wet-process Phosphoric Acid Production fodder additives MDCP that cost is low, have the market competitiveness.
The objective of the invention is that following technological process realizes by implementing: a kind of phosphorus pentoxide content is the novel method of 20 30% middle concentration Wet-process Phosphoric Acid Production fodder additives MDCP, in regular turn by mid low grade phosphate rock extraction wet method crude phosphoric acid operation, raw phosphoric acid defluorinate removal of impurities concentrates smart phosphoric acid operation, smart phosphoric acid and secondary calcium phosphate filter cake reacting and pulping operation, one-level spraying drying operation and secondary vibration fluidised bed drying are made the MDCP operation and are formed, it is characterized in that: described raw phosphoric acid defluorinate removal of impurities concentrates the operation of smart phosphoric acid, successively is made up of the gentle concentrated sub-operation of removal of impurities of carrying of the sub-operation of constant voltage air supporting defluorinate removal of impurities; In the sub-operation of constant voltage air supporting defluorinate removal of impurities, the raw phosphoric acid of preceding operation extraction is added defluorinating agent, cleaner, flocculation agent, purify raw phosphoric acid, to liquid level, exclude with the pressurized air of constant voltage or the over dry industrial sulphuric acid tail gas villiaumite contaminant particles that generates in the phosphoric acid defluorination that blows floating; Propose removal of impurities at gas and concentrate in the sub-operation, in the phosphoric acid of defluorinate removal of impurities, be blown into the sulfuric acid tail gas of constant voltage warm air or over dry in the sub-operation forward, further purify and be condensed into the smart phosphoric acid that concentration is 40-50%.
Additional technical feature of the present invention is: 1. in the sub-operation of constant voltage air supporting defluorinate removal of impurities, the defluorinating agent of adding is mainly NO
2SO
4, flocculation agent is polymerize aluminum chloride and bodied ferric sulfate, cleaner is Paris white, lime powder.2. propose removal of impurities and concentrate in the sub-operation in that the sub-operation of constant voltage air supporting defluorinate removal of impurities is gentle, being blown into the compression constant pressure air in the phosphoric acid or the pressure of over dry industrial sulphuric acid tail gas is 150-900mmH
2O, the inlet flow velocity of air or over dry sulfuric acid tail gas is the 20-40 meter per second.3. propose removal of impurities and concentrate in the sub-operation in that the sub-operation of constant voltage air supporting defluorinate removal of impurities is gentle, the pressure and the over dry sulfuric acid tail gas pressure optimum value that are blown into the constant pressure air in the phosphoric acid defluorination are 500～600mmH
2O.
The invention has the advantages that: 1. owing to low-grade phosphorus ore slurry in utilizing and sulfuric acid extraction raw phosphoric acid, thus low-grade phosphorus ore in the effective development and use; 2. because in production technique, with in concentration phosphoric acid directly react in mutually at solid-liquid with the secondary calcium phosphate of feed grade, the time weak point, process is easy to control, takes up an area of for a short time, equipment is few, with short production cycle, product cost is low, have the market competitiveness; 3. producing the MDCP method with existing thermal phosphoric acid compares, owing to concentrate in the smart phosphoric acid operation in raw phosphoric acid defluorinate removal of impurities, successively use the sub-operation of constant voltage air supporting defluorinate removal of impurities and proposed the gas removal of impurities and concentrated sub-operation, in preceding sub-operation, also used polymerize aluminum chloride and bodied ferric sulfate to make flocculation agent, thereby make the defluorinate impurity-eliminating effect better, improved the rate of recovery of phosphorus greatly, the fodder/ fertilizer ratio of product MDCP is reached more than 95%.
Description of drawings Fig. 1 is the process flow sheet of concentration Wet-process Phosphoric Acid Production MDCP among the present invention.
Embodiment
The novel method of middle concentration Wet-process Phosphoric Acid Production fodder additives MDCP is made up of mid low grade phosphate rock extraction wet method crude phosphoric acid operation, the gentle concentrated smart phosphoric acid operation of removal of impurities, smart phosphoric acid and secondary calcium phosphate filter cake reacting and pulping operation, one-level spraying drying operation and the secondary vibration fluidised bed drying operation carried of constant voltage air supporting defluorinate removal of impurities in regular turn; Wherein: in the raw phosphoric acid extraction process, used phosphorus ore content is the phosphorus ore more than 28%, and phosphorus ore and vitriolic ratio are 1: (0.7～.85); The extractive reaction temperature is 60～90 ℃, and pressure is normal pressure, and the extraction time is 2-6 hour; In the sub-operation of constant voltage air supporting defluorinate removal of impurities, used defluorinating agent is mainly Na
2SO
4, flocculation agent is polymerize aluminum chloride, bodied ferric sulfate, taking off assorted agent is Paris white, lime powder, makes raw phosphoric acid defluorinate removal of impurities, and uses pressure 500-600mmH
2O, inlet flow velocity are that the pressurized air of 20-40 meter per second feeds in the phosphoric acid defluorination, and the villiaumite contaminant particles that generates is blowed floating to be excluded on the phosphoric acid liquid level; Propose removal of impurities at gas and concentrate in the sub-operation, make full use of the over dry tail gas of sulphur-burning sulphuric acid plant absorption tower outlet and the middle potential temperature waste heat of conversion system, gas is proposed removal of impurities, is further purified that to be condensed into concentration be 40～45% smart phosphoric acid.
Claims (4)
1, the novel method of a kind of middle concentration Wet-process Phosphoric Acid Production fodder additives MDCP, making the MDCP operation by mid low grade phosphate rock extraction wet method crude phosphoric acid operation, the concentrated smart phosphoric acid operation of raw phosphoric acid defluorinate removal of impurities, smart phosphoric acid and secondary calcium phosphate filter cake reacting and pulping operation, one-level spraying drying operation and secondary vibration fluidised bed drying is in regular turn formed, it is characterized in that: described raw phosphoric acid defluorinate removal of impurities concentrates smart phosphoric acid operation, successively is made up of the gentle concentrated sub-operation of removal of impurities of carrying of the sub-operation of constant voltage air supporting defluorinate removal of impurities; In the sub-operation of constant voltage air supporting defluorinate removal of impurities, the raw phosphoric acid of preceding operation extraction is added defluorinating agent, cleaner, flocculation agent, purify raw phosphoric acid, to liquid level, exclude with the pressurized air of constant voltage or the over dry industrial sulphuric acid tail gas villiaumite contaminant particles that generates in the phosphoric acid defluorination that blows floating; Propose removal of impurities at gas and concentrate in the sub-operation, in the phosphoric acid of defluorinate removal of impurities, be blown into the sulfuric acid tail gas of constant voltage warm air or over dry in the sub-operation forward, further purify and be condensed into the smart phosphoric acid that concentration is 40%-45%.
2, according to the novel method of the described middle concentration Wet-process Phosphoric Acid Production fodder additives MDCP of claim 1, it is characterized in that: in the sub-operation of constant voltage air supporting defluorinate removal of impurities, the defluorinating agent of adding is mainly Na
2SO
4, flocculation agent is polymerize aluminum chloride and bodied ferric sulfate, cleaner is Paris white, lime powder.
3, according to claim 2 described in the novel method of concentration Wet-process Phosphoric Acid Production fodder additives MDCP, it is characterized in that: propose removal of impurities and concentrate in the sub-operation in that the sub-operation of constant voltage air supporting defluorinate removal of impurities is gentle, being blown into the compression constant pressure air in the phosphoric acid or the pressure of over dry industrial sulphuric acid tail gas is 150-900mmH
2O, the inlet flow velocity of air or over dry sulfuric acid tail gas is the 20-40 meter per second.
4, according to claim 3 described in the novel method of concentration Wet-process Phosphoric Acid Production fodder additives MDCP, it is characterized in that: propose removal of impurities and concentrate in the sub-operation in that the sub-operation of constant voltage air supporting defluorinate removal of impurities is gentle, the pressure and the over dry sulfuric acid tail gas pressure optimum value that are blown into the constant pressure air in the phosphoric acid defluorination are 500-600mmH
2O.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021336784A CN1478721A (en) | 2002-08-29 | 2002-08-29 | New method for producing feed additive MDCP using medium concentration wet method phosphoric acid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021336784A CN1478721A (en) | 2002-08-29 | 2002-08-29 | New method for producing feed additive MDCP using medium concentration wet method phosphoric acid |
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|---|---|
| CN1478721A true CN1478721A (en) | 2004-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021336784A Pending CN1478721A (en) | 2002-08-29 | 2002-08-29 | New method for producing feed additive MDCP using medium concentration wet method phosphoric acid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100404412C (en) * | 2006-05-26 | 2008-07-23 | 李光明 | Method for producing feed grade dicalcium phosphate |
| CN111115602A (en) * | 2020-01-03 | 2020-05-08 | 云南磷化集团有限公司 | Preparation method of low-chromium feed-grade MDCP |
-
2002
- 2002-08-29 CN CNA021336784A patent/CN1478721A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100404412C (en) * | 2006-05-26 | 2008-07-23 | 李光明 | Method for producing feed grade dicalcium phosphate |
| CN111115602A (en) * | 2020-01-03 | 2020-05-08 | 云南磷化集团有限公司 | Preparation method of low-chromium feed-grade MDCP |
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