CN101525129A - Method for reducing fluoride in diluted phosphoric acid by wet process - Google Patents
Method for reducing fluoride in diluted phosphoric acid by wet process Download PDFInfo
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- CN101525129A CN101525129A CN200910102527A CN200910102527A CN101525129A CN 101525129 A CN101525129 A CN 101525129A CN 200910102527 A CN200910102527 A CN 200910102527A CN 200910102527 A CN200910102527 A CN 200910102527A CN 101525129 A CN101525129 A CN 101525129A
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- phosphoric acid
- fluorine
- sodium sulfate
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- wet process
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Abstract
A method for reducing fluoride in diluted phosphoric acid by wet process is provided. In the method, sodium sulfate is taken as defluoridator, phosphoric acid is added during production of phosphoric acid by wet process for reaction to extract sections, reaction time between sodium sulfate defluoridator and hydrofluosilicic acid in slurry is maintained between 0.2-6 hours; fluorine in diluted acid is precipitated in the form of fluoride or fluorosilicate to enter phosphoric acid slurry solid phase; then, when being filtered, phosphogypsum enters phosphoric acid slurry solid phase to be separated and removed, thus lowering fluorine content in diluted phosphoric acid. Compared with the traditional defluorination method, the method of the invention has the following advantages: 1. defluorination efficiency is improved by more than 50%; 2. energy comsumption is low or process flow is short, production cost is lowered by more than 10% compared with the production cost of defluorinating phosphoric acid; 3. corrosion of fluorine on pipelines of the devices are reduced by about 5-15%, operating ratio of the devices is improved by about 1%; 4. the produced phosphate fertilizer products can meet the growth requirements of high-end crops; 5. the defluorination method is simple, convenient and easy to operate and control; 6. the investment is small. The method of the invention is applicable to factories producing phosphoric acid by wet process.
Description
Technical field
The present invention relates to phosphoric acid, furthermore, relate to phosphoric acid by wet process, specifically, relate to the method that diluted phosphoric acid by wet process reduces fluorine content.
Background technology
As everyone knows, in the Wet-process Phosphoric Acid Production,, generate silicofluoric acid through the reaction back owing to contain a large amount of fluorine in the raw material phosphorus ore.After silicofluoric acid enters system, serious to equipment, the corrosive pipeline of system, influence the normal operation of device.Traditional defluorination method is to wash with water to absorb the receipts SiF that concentration and evaporation comes out in the concentration process of phosphoric acid
4And HF, or in strong phosphoric acid, add defluorinating agent.These method defluorinate efficient are low, fluorine content height in the product phosphoric acid.With the high phosphoric acid production phosphate fertilizer of fluorine content, fluorine content is also higher in the phosphate fertilizer product, does not reach American-European countries's environmental requirement, and this phosphate fertilizer uses and is subjected to certain limitation, can not satisfy the high-end production of phosphate fertilizer requirement of specific demand, can not adapt to high-end crop growth demand.In order to reduce phosphate fertilizer fluorine content, traditional method concentrates 2～3 defluorinates repeatedly with phosphoric acid, promptly adds the water reconcentration after the Phosphoric Acid Concentration 2～3 times repeatedly; Or strong phosphoric acid adds the defluorinate of defluorinating agent after-filtration.The former energy consumption height, consuming quantity of steam increases by 1～2 times; The latter increases a strong phosphoric acid than traditional mode of production and filters workshop section.Any method no matter, production cost all increases considerably, deficiency in economic performance.
At present, in the Chinese invention patent, the patent that relates to phosphoric acid and the defluorinate of phosphate production process has 32, for example No. 200510048779.5 " a kind of purifying method of phosphoric acid by wet process ", No. 200710066243.5 " a kind of method of kiln-way phosphoric acid absorbing defluorination ", No. 200610118696.3 " a kind of efficient defluorinating agent and use this defluorinating agent carries out degree of depth defluorinate to phosphoric acid by wet process method " etc.Up to now, do not see the report that in diluted acid, adopts sodium sulfate to reduce fluorine content technology as yet, do not have relevant patented technology yet.
Summary of the invention
The method that the purpose of this invention is to provide a kind of reducing fluoride in diluted phosphoric acid by wet process with the fluorine content in the reduction dilute phosphoric acid, thereby can be used to produce the low phosphate fertilizer product of fluorine content, satisfies high-end crop growth demand.
The reducing fluoride method of the diluted phosphoric acid by wet process that the contriver provides, be as fluorine reducing agent with sodium sulfate, in Wet-process Phosphoric Acid Production, add phosphatase reaction extraction workshop section, the silicofluoric acid reaction times is 0.2～6 hour in maintenance sodium sulfate fluorine reducing agent and the slip, and the fluorine in the diluted acid is precipitated out with fluorochemical or silicofluoride and enters the phosphoric acid material pulp solid phase; Also will enter the phosphoric acid material pulp solid phase then when phosphoric acid filters workshop section's elimination phosphogypsum, separation is removed, thereby reduces fluorine content in the dilute phosphoric acid.
Above-mentioned sodium sulphate content 〉=10% as fluorine reducing agent; The usage quantity that adds the sodium sulfate fluorine reducing agent adds according to 100%～120% of theoretical amount for after calculating theoretical requirement, makes the amount that adds sodium sulfate account for 0.01%～10% of phosphoric acid material pulp amount.
Above-mentioned fluorine reducing agent adds the concrete equipment of phosphatase reaction extraction workshop section, can be added in extraction tank, also can be added in digestive shelf.
After fluorine falls in adding sodium sulfate, owing to SO in reaction, the filtering system
3Increase, the molten phosphorus of Chinese holly drops to 0.53% from 0.61% in the gypsum, has improved reaction yield; After low fluorine dilute phosphoric acid concentrates, obtain hanging down the hexafluorophosphoric acid product and be used for downstream unit production environmental requirement high phosphorus fertilizer product through concentrating.
Method provided by the invention is compared with the traditional mode of production phosphoric acid defluorination, has the following advantages: 1. defluorinate efficient increases substantially, and reaches more than 50%; 2. the low or technical process of energy consumption is short, and production cost will reduce more than 10% than phosphoric acid defluorination production, and is only suitable with common phosphoric acid production cost; 3. alleviate fluorine to the about 5%-15% of the corrosion of phosphoric acid plant equipment pipe, improve device operation ratio about 1%; 4. the phosphate fertilizer product fluorine content of Sheng Chaning is low, can satisfy high-end crop growth demand; 5. the reducing fluoride method use is simple, convenient, easy handling control; 6. less investment.Present method is applicable to the manufacturer of phosphoric acid by wet process.
Embodiment
Embodiment 1 adds Na on demand in urn good fortune phosphate fertilizer plant of urn good fortune (group) company phosphoric acid plant
2SO
4120% of calculated amount adds digestive shelf with sodium sulfate, and keeping the reaction times is 1 hour.After testing, fluorine content drops to 1.8% from 2.5% in the prepared dilute phosphoric acid, and fluorine content falls on a year-on-year basis more than 50% in the dilute phosphoric acid.
Embodiment 2 adds Na on demand in urn good fortune phosphate fertilizer plant of urn good fortune (group) company phosphoric acid plant
2SO
4100% of calculated amount adds digestive shelf with sodium sulfate, and keeping the reaction times is 1.5 hours.After testing, fluorine content drops to 1.2% from 2.5% in the prepared dilute phosphoric acid, and fluorine content falls on a year-on-year basis more than 52% in the dilute phosphoric acid,
Through concentrating, fluorine content 1.1% drops to 0.4% before the diluted acid defluorinate in the resulting strong phosphoric acid by the dilute phosphoric acid after the foregoing description defluorinate.Phosphoric acid by wet process fluorine content reduces and has alleviated the corrosion of fluorine to the phosphoric acid plant equipment pipe, has improved the operation ratio of device.
Claims (3)
- The reducing fluoride method of 1 one kinds of diluted phosphoric acid by wet process, it is characterized in that this method is as fluorine reducing agent with sodium sulfate, in Wet-process Phosphoric Acid Production, add phosphatase reaction extraction workshop section, the silicofluoric acid reaction times is 0.2～6 hour in maintenance sodium sulfate fluorine reducing agent and the slip, and the fluorine in the diluted acid is precipitated out with fluorochemical or silicofluoride and enters the phosphoric acid material pulp solid phase; Also will enter the phosphoric acid material pulp solid phase then when phosphoric acid filters workshop section's elimination phosphogypsum, separation is removed, thereby reduces fluorine content in the dilute phosphoric acid.
- 2 the method for claim 1 is characterized in that sodium sulphate content 〉=10% of described conduct as fluorine reducing agent; The usage quantity that adds the sodium sulfate fluorine reducing agent is 100%～120% of a theoretical amount, makes the amount that adds sodium sulfate account for 0.01%～10% of phosphoric acid material pulp amount.
- 3 the method for claim 1 is characterized in that the concrete equipment that described fluorine reducing agent adding phosphatase reaction extracts workshop section is extraction tank or digestive shelf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910102527A CN101525129A (en) | 2009-04-22 | 2009-04-22 | Method for reducing fluoride in diluted phosphoric acid by wet process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910102527A CN101525129A (en) | 2009-04-22 | 2009-04-22 | Method for reducing fluoride in diluted phosphoric acid by wet process |
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| CN101525129A true CN101525129A (en) | 2009-09-09 |
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| CN200910102527A Pending CN101525129A (en) | 2009-04-22 | 2009-04-22 | Method for reducing fluoride in diluted phosphoric acid by wet process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104803366A (en) * | 2015-04-15 | 2015-07-29 | 瓮福（集团）有限责任公司 | Method for increasing recovery quantity of fluorine resources in phosphoric acid through recycling of fluorine-containing silicon slag |
| CN113148968A (en) * | 2021-05-24 | 2021-07-23 | 云南云天化股份有限公司 | Method for producing alpha-semi-hydrated gypsum by wet-process phosphorus processing |
-
2009
- 2009-04-22 CN CN200910102527A patent/CN101525129A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104803366A (en) * | 2015-04-15 | 2015-07-29 | 瓮福（集团）有限责任公司 | Method for increasing recovery quantity of fluorine resources in phosphoric acid through recycling of fluorine-containing silicon slag |
| CN113148968A (en) * | 2021-05-24 | 2021-07-23 | 云南云天化股份有限公司 | Method for producing alpha-semi-hydrated gypsum by wet-process phosphorus processing |
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Open date: 20090909 |