CN109399592A - A kind of method of heavy metal in removing phosphoric acid - Google Patents
A kind of method of heavy metal in removing phosphoric acid Download PDFInfo
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- CN109399592A CN109399592A CN201811640457.3A CN201811640457A CN109399592A CN 109399592 A CN109399592 A CN 109399592A CN 201811640457 A CN201811640457 A CN 201811640457A CN 109399592 A CN109399592 A CN 109399592A
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- Prior art keywords
- phosphoric acid
- heavy metal
- pipeline
- sodium
- stirred tank
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/237—Selective elimination of impurities
- C01B25/238—Cationic impurities, e.g. arsenic compounds
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a kind of methods of heavy metal in removing phosphoric acid, insoluble compound is generated in conjunction with heavy metal ion in phosphoric acid using vulcanized sodium, and it precipitates, to realize the purpose of heavy metal in removing phosphoric acid, the requirement for meeting production feed phosphate product, includes the following steps: that 1) phosphoric acid is stirred and is reacted in closed stirred tank with sodium sulfide solution；2) hydrogen sulfide gas that step (1) reaction generates is guided to the pipeline above container；3) phosphoric acid is recycled with pump in pipeline, is absorbed above pipeline using two-stage phosphoric acid spray；4) use is exported again after the content of beary metal in step (3) phosphoric acid is qualified, then new phosphoric acid is supplemented to stirred tank, method provided by the present invention keeps reaction more abundant, prevent the evolution of pernicious gas, and the usage amount of vulcanized sodium is greatly decreased, the content for reducing sodium ion in water, reduces production cost.
Description
Technical field
The present invention relates to a kind of sides of heavy metal in mineral additive for feed technical field more particularly to removing phosphoric acid
Method.
Background technique
Require the content of heavy metal that need to reach standard value, the content of beary metal in phosphoric acid in feed phosphate (DCP MCP)
Depending on the content in phosphorus ore, so need to remove in heavy metal contained in phosphoric acid (cadmium, chromium, arsenic, lead etc.), it is logical at present
Method is that vulcanized sodium or sulfurated lime solution are added in phosphoric acid, and sodium sulfide solution is quickly generated hydrogen sulfide after meeting phosphatase reaction
Gas, hydrogen sulfide gas are reacted with arsenic, lead, the cadmium etc. in phosphoric acid, generate sulfide solid precipitating, by be separated by solid-liquid separation from
And achieve the purpose that remove heavy metal in phosphoric acid, hydrogen sulfide gas is easy the evolution from phosphoric acid liquid and causes personnel in the process
The even dead danger of poisoning, the hydrogen sulfide of spilling have neither part nor lot in reaction, will cause the waste of raw material, and vulcanized sodium additive amount increases
After big, sodium ion increases in phosphoric acid, is unfavorable for recycling for waste water.
Summary of the invention
It is an object of the invention to: during heavy metal in above-mentioned removing phosphoric acid, hydrogen sulfide gas is easy from phosphorus
The danger that evolution causes personnel's poisoning even dead in acid solution body, and will cause the waste of raw material, and vulcanized sodium additive amount
The problem of after increase, sodium ion increases in phosphoric acid, is unfavorable for cycling utilization of wastewater, the present invention provide a huge sum of money in a kind of removing phosphoric acid
The method of category.
The technical solution adopted by the invention is as follows:
The method of heavy metal, generates indissoluble using vulcanized sodium in conjunction with heavy metal ion in phosphoric acid in a kind of removing phosphoric acid
Object is closed, and is precipitated, to realize the purpose of heavy metal in removing phosphoric acid, meets the requirement of production feed phosphate product,
De- weight process carries out in closed stirred tank, phosphoric acid is carried out cyclic absorption in pipeline with pump, to avoid stink damp
Body evolution.
Further, include the following steps:
(1) phosphoric acid is stirred and is reacted in closed stirred tank with sodium sulfide solution；
(2) hydrogen sulfide gas that step (1) reaction generates is guided to the pipeline above container；
(3) phosphoric acid is recycled with pump in pipeline, is absorbed above pipeline using two-stage phosphoric acid spray；
(4) until exporting use again after content of beary metal in step (3) phosphoric acid is qualified, new phosphoric acid is then supplemented to stirring
Mix slot.
Further, it is 20~80 DEG C, 40~60min of reaction time, 40~80r/ of stirring rate that phosphoric acid, which takes off degree of reviewing,
min。
Further, the step (2), the pipeline in step (3) are Venturi tube.
The present invention is using heavy metal in chemical method removing phosphoric acid, according to heavy metal Pb2+With S2-Generate the spy of insoluble compound
Sign, is added Na in phosphoric acid2S solution generates sulfide precipitation under certain temperature, time, stirring, is separated by filtration removing phosphorus
Heavy metal in acid.
Main chemical reactions formula are as follows: 2H++S2-=H2S↑、Pb2++S2-=PbS ↓, 2As3++3S2-=As2S3↓、Cd2++S2-=
CdS↓、2Cr3++3S2-=Cr2S3↓
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
1, method provided by the present invention is met after acid reaction generates hydrogen sulfide gas in vulcanized sodium and can sufficiently be carried out with phosphoric acid
Reaction neutralizes the heavy metal in phosphoric acid, reacts more abundant.
2, method provided by the present invention prevents the evolution of pernicious gas, avoids security risk.
3, the usage amount of vulcanized sodium is greatly decreased in method provided by the present invention, reduces production cost, and reduce
The enriching quantity of sodium ion in water, convenient for the recycling of water.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
The method of heavy metal, generates indissoluble using vulcanized sodium in conjunction with heavy metal ion in phosphoric acid in a kind of removing phosphoric acid
Object is closed, and is precipitated, to realize the purpose of heavy metal in removing phosphoric acid, meets the requirement of production feed phosphate product,
De- weight process carries out in closed stirred tank, phosphoric acid is carried out cyclic absorption in pipeline with pump, to avoid stink damp
Body evolution.
It elaborates below with reference to Fig. 1 to the present invention.
Embodiment 1
The method of heavy metal, includes the following steps: in a kind of removing phosphoric acid
(1) phosphoric acid is stirred and is reacted in closed stirred tank with sodium sulfide solution；
(2) hydrogen sulfide gas that step (1) reaction generates is guided to the pipeline above container；
(3) phosphoric acid is recycled with pump in pipeline, is absorbed above pipeline using two-stage phosphoric acid spray；
(4) until exporting use again after content of beary metal in step (3) phosphoric acid is qualified, new phosphoric acid is then supplemented to stirring
Mix slot.
Further, it is 20 DEG C, reaction time 40min, stirring rate 40r/min that phosphoric acid, which takes off degree of reviewing,.
After processing, removing heavy metal (in terms of Pb) content in phosphoric acid is about 7.5ppm, and heavy metal removing rate is up to 99.8%.
Embodiment 2
The method of heavy metal, includes the following steps: in a kind of removing phosphoric acid
(1) phosphoric acid is stirred and is reacted in closed stirred tank with sodium sulfide solution；
(2) hydrogen sulfide gas that step (1) reaction generates is guided to the pipeline above container；
(3) phosphoric acid is recycled with pump in pipeline, is absorbed above pipeline using two-stage phosphoric acid spray；
(4) until exporting use again after content of beary metal in step (3) phosphoric acid is qualified, new phosphoric acid is then supplemented to stirring
Mix slot.
Further, it is 50 DEG C, reaction time 50min, stirring rate 60r/min that phosphoric acid, which takes off degree of reviewing,.
After processing, removing heavy metal (in terms of Pb) content in phosphoric acid is about 7.7ppm, and heavy metal removing rate is up to 99.9%.
Embodiment 3
The method of heavy metal, includes the following steps: in a kind of removing phosphoric acid
(1) phosphoric acid is stirred and is reacted in closed stirred tank with sodium sulfide solution；
(2) hydrogen sulfide gas that step (1) reaction generates is guided to the pipeline above container；
(3) phosphoric acid is recycled with pump in pipeline, is absorbed above pipeline using two-stage phosphoric acid spray；
(4) until exporting use again after content of beary metal in step (3) phosphoric acid is qualified, new phosphoric acid is then supplemented to stirring
Mix slot.
Further, it is 80 DEG C, reaction time 60min, stirring rate 80r/min that phosphoric acid, which takes off degree of reviewing,.
After processing, removing heavy metal (in terms of Pb) content in phosphoric acid is about 7.3ppm, and heavy metal removing rate is up to 99.7%
The present invention is not limited to above-mentioned specific embodiment, those skilled in the art are not departing from spirit and model of the invention
Under the premise of enclosing, several change and modification can be done.Protection scope of the present invention should be subject to claim of the invention.
Claims (4)
1. a kind of method of heavy metal in removing phosphoric acid, it is characterised in that: using vulcanized sodium in conjunction with heavy metal ion in phosphoric acid
Insoluble compound is generated, and is precipitated, to realize the purpose of heavy metal in removing phosphoric acid, meets production feed phosphate and produces
The requirement of product, de- weight process carry out in closed stirred tank, phosphoric acid are carried out cyclic absorption in pipeline with pump, to avoid
Hydrogen sulfide gas evolution.
2. the method for heavy metal in a kind of removing phosphoric acid according to claim 1, which comprises the steps of:
(1) phosphoric acid is stirred and is reacted in closed stirred tank with sodium sulfide solution；
(2) hydrogen sulfide gas that step (1) reaction generates is guided to the pipeline above container；
(3) phosphoric acid is recycled with pump in pipeline, is absorbed above pipeline using two-stage phosphoric acid spray；
(4) use is exported again after the content of beary metal in step (3) phosphoric acid is qualified, then supplement new phosphoric acid to stirring
Slot.
3. the method for heavy metal in a kind of removing phosphoric acid according to claim 1, it is characterised in that: phosphoric acid takes off degree of reviewing and is
20~80 DEG C, 40~60min of reaction time, 40~80r/min of stirring rate.
4. the method for heavy metal in a kind of removing phosphoric acid according to claim 1, it is characterised in that: the step (2), step
Suddenly the pipeline in (3) is Venturi tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811640457.3A CN109399592A (en) | 2018-12-29 | 2018-12-29 | A kind of method of heavy metal in removing phosphoric acid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811640457.3A CN109399592A (en) | 2018-12-29 | 2018-12-29 | A kind of method of heavy metal in removing phosphoric acid |
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| CN109399592A true CN109399592A (en) | 2019-03-01 |
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| CN201811640457.3A Pending CN109399592A (en) | 2018-12-29 | 2018-12-29 | A kind of method of heavy metal in removing phosphoric acid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109809378A (en) * | 2019-03-27 | 2019-05-28 | 重庆万盛川东化工有限公司 | Phosphoric acid for food production technology |
| CN115072682A (en) * | 2022-06-07 | 2022-09-20 | 瓮福（集团）有限责任公司 | Feed-grade wet-process phosphoric acid dearsenification method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597040A (en) * | 2009-07-01 | 2009-12-09 | 侯炎学 | A kind of method of using producing food grade phosphoric acid with refined wet phosphoric acid and products thereof |
| CN106744761A (en) * | 2016-12-28 | 2017-05-31 | 云南磷化集团有限公司 | The technology of heavy metal in a kind of removing wet dilute phosphoric acid |
| CN208166579U (en) * | 2018-03-06 | 2018-11-30 | 武汉江汉化工设计有限公司 | Wet phosphoric acid purifying process for producing system |
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2018
- 2018-12-29 CN CN201811640457.3A patent/CN109399592A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597040A (en) * | 2009-07-01 | 2009-12-09 | 侯炎学 | A kind of method of using producing food grade phosphoric acid with refined wet phosphoric acid and products thereof |
| CN106744761A (en) * | 2016-12-28 | 2017-05-31 | 云南磷化集团有限公司 | The technology of heavy metal in a kind of removing wet dilute phosphoric acid |
| CN208166579U (en) * | 2018-03-06 | 2018-11-30 | 武汉江汉化工设计有限公司 | Wet phosphoric acid purifying process for producing system |
Non-Patent Citations (3)
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| 俞强: "磷酸脱砷技术", 《贵州化工》 * |
| 崔九思: "《大气污染监测方法》", 28 February 1997, 化学工业出版社 * |
| 韩海泉: "热法磷酸脱砷制取食品级磷酸", 《河北化工》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109809378A (en) * | 2019-03-27 | 2019-05-28 | 重庆万盛川东化工有限公司 | Phosphoric acid for food production technology |
| CN115072682A (en) * | 2022-06-07 | 2022-09-20 | 瓮福（集团）有限责任公司 | Feed-grade wet-process phosphoric acid dearsenification method |
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