CN114669183A - Phosphorus chemical industry by-product CO2Method for using tail gas for phosphorite flotation - Google Patents
Phosphorus chemical industry by-product CO2Method for using tail gas for phosphorite flotation Download PDFInfo
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- CN114669183A CN114669183A CN202210275264.2A CN202210275264A CN114669183A CN 114669183 A CN114669183 A CN 114669183A CN 202210275264 A CN202210275264 A CN 202210275264A CN 114669183 A CN114669183 A CN 114669183A
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- Prior art keywords
- tail gas
- gas
- flotation
- chemical industry
- phosphorite
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- 238000005188 flotation Methods 0.000 title claims abstract description 41
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000011574 phosphorus Substances 0.000 title claims abstract description 23
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 21
- 239000002367 phosphate rock Substances 0.000 title claims abstract description 19
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000000126 substance Substances 0.000 title claims abstract description 19
- 239000006227 byproduct Substances 0.000 title claims abstract description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005406 washing Methods 0.000 claims abstract description 19
- 239000008399 tap water Substances 0.000 claims abstract description 15
- 235000020679 tap water Nutrition 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000003245 coal Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000012670 alkaline solution Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000001506 calcium phosphate Substances 0.000 claims abstract description 7
- 229910000389 calcium phosphate Inorganic materials 0.000 claims abstract description 7
- 235000011010 calcium phosphates Nutrition 0.000 claims abstract description 7
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims abstract description 7
- 239000000047 product Substances 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 88
- 239000003513 alkali Substances 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- CDDBPMZDDVHXFN-ONEGZZNKSA-N 2-[(e)-3-(1,3-benzodioxol-5-yl)prop-2-enyl]-1-hydroxypiperidine Chemical compound ON1CCCCC1C\C=C\C1=CC=C(OCO2)C2=C1 CDDBPMZDDVHXFN-ONEGZZNKSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a byproduct CO of phosphorus chemical industry2A method for using tail gas for phosphorite flotation relates to the technical field of phosphorite flotation. CO is introduced into2Introducing tail gas into the gas treatment chamber from the bottom, spraying 1% alkaline solution on the top of the gas treatment chamber, and treating CO with the alkaline solution2Washing and cooling the tail gas in a counter-current manner; treated CO2Tail gas enters the gas collecting chamber from the bottom, tap water is sprayed on the top of the gas collecting chamber, and the tap water is used for treating CO2Carrying out countercurrent washing and cooling on the tail gas to obtain a mixed gas with the temperature of 50-70 ℃; introducing CO2And introducing the tail gas into a flotation device through an exhaust fan or a compressor to be used as an air source for phosphorite flotation. Burning the coal for drying the phosphatized products and CaCO in the production of calcium phosphate feed3CO-containing after reaction with phosphoric acid2The tail gas is subjected to secondary washing, impurity removal and temperature reduction, and is directly used as a phosphorite flotation gas source, so that CO is avoided2And tail gas is exhausted, so that carbon emission is greatly reduced.
Description
Technical Field
The invention relates to the technical field of phosphorite flotation, in particular to a phosphorus chemical by-product CO2The tail gas is used for phosphorite flotation.
Background
The unable direct phosphoric acid production that is used for of low-grade phosphorus ore, need be through the flotation with the phosphorus enrichment, can be in the flotation equipment is recharged through forms such as compression with the air in phosphorus ore flotation operation, the air can form a large amount of bubbles, will take away through the hydrophobic mineral after the flotation medicament mineralize mineralization, effectively with useful mineral and gangue mineral separation to this comes to carry out the flotation to the phosphorus ore. In phosphorus chemical industry, the heat of coal combustion is needed to dry the product, and CaCO is used in the production of calcium phosphate feed3Reaction with phosphoric acid to give the corresponding fertilizer, in both processes a large amount of CO is produced2The tail gas, the tail gas after coal combustion also contains S, N and other gases, the calcium phosphate reaction also contains a small amount of F-containing gas, and most factories treat toxic components in the tail gas due to complex components and different contents of the tail gas, and CO is treated2Direct evacuation measures are taken, but large amounts of CO2The emission can directly aggravate the greenhouse effect, and the low-carbon and environment-friendly requirements are not met.
Disclosure of Invention
The invention aims to provide a byproduct CO of phosphorus chemical industry2The method of using tail gas in phosphorite floatation solves the problem of existing method containing CO2The direct exhaust of the tail gas leads to the problem of aggravation of the greenhouse effect.
In order to solve the technical problem, the invention adopts the following technical scheme: phosphorus chemical industry by-product CO2The method for using the tail gas for phosphorite flotation is characterized by comprising the following steps:
s1, mixing CO2The tail gas is introduced into the gas treatment chamber from the bottom, and the top of the gas treatment chamberSpraying 1% alkaline solution to CO2Washing and cooling the tail gas in a counter-current manner;
s2, CO processed by step S12Tail gas enters the gas collecting chamber from the bottom, tap water is sprayed on the top of the gas collecting chamber, and the tap water is used for treating CO2Carrying out countercurrent washing and cooling on the tail gas to obtain a mixed gas with the temperature of 50-70 ℃;
s3, the CO obtained in the step S22And introducing the tail gas into a flotation device through an exhaust fan or a compressor to be used as an air source for phosphorite flotation.
The further technical proposal is that the alkaline solution is sodium hydroxide, sodium carbonate or lime water solution.
The further technical proposal is that the CO is2The tail gas is the tail gas after burning coal for drying the phosphating products.
The further technical proposal is that the CO is2The tail gas is CaCO in the production of calcium phosphate feed3Tail gas after reaction with phosphoric acid.
The reaction mechanism is as follows:
tail gas (common CO in tail gas) after burning coal for drying phosphating products 2The content is more than 30%, the temperature is higher than 100 ℃, and the impurities mainly comprise ash, CO, NO and NO2And SO2Etc.), CaCO in production of calcium phosphate feed3Tail gas after reaction with phosphoric acid (the tail gas generally contains CO)2The content is more than 30%, the temperature is higher than 100 ℃, and the impurities mainly comprise ash, P, F and SO2Gas) is washed by 1 percent of alkaline solution (sodium hydroxide, sodium carbonate or lime water solution) in a countercurrent way, substances removed in the washing process comprise ash, sulfide, phosphorus, fluorine and the like, and the temperature of the treated tail gas is about 80 percent; and (4) washing the tail gas by running water in a counter-current manner again (the running water can dilute and neutralize alkaline or acidic gas after being cooled so as to prevent corrosion of gas transmission equipment), and reducing the temperature of the tail gas to 50-70 ℃. The tail gas can be directly introduced into the flotation device through an exhaust fan or a compressor to be used as a gas source for phosphorite flotation.
Compared with the prior art, the invention has the beneficial effects that: provides CO in phosphorus chemical industry2The tail gas is used for phosphorite floatation, and the coal for drying phosphorized products is combusted, and CaCO is used in the production of calcium phosphate feed3CO-containing after reaction with phosphoric acid2The tail gas is subjected to secondary washing, impurity removal and temperature reduction, and is directly used as a phosphorite flotation gas source, so that CO is avoided 2And tail gas is exhausted, so that carbon emission is greatly reduced.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A certain phosphating device is 80 million t/year of sulfuric acid, 30 million t/year of phosphoric acid and 3 million tons/year of DAP60 million t/year of fire coal, and generates CO every year2Gas 10.8 million tons (CO)2In an amount of about 14 km3A). By-producing CO from phosphorus chemical industry2Introducing tail gas mainly containing gas into a gas treatment chamber from the bottom, spraying by using a 1% sodium hydroxide solution, wherein the spraying amount/air inflow in the alkali washing process is 1/10-1/4), spraying tap water at the top of the gas collection chamber when the tail gas washed by alkali liquor enters the gas collection chamber from the bottom, and the spraying amount/air inflow in the tap water washing process is 1/8-1/6; washing the tail gas with primary alkali liquor and primary tap water, and cooling to 50-60 ℃; will contain CO2And a draft fan for introducing mixed gas mainly comprising gas is conveyed to a 100-ten-thousand-ton flotation plant, the mixed gas is directly introduced into a flotation device, and the mixed gas is adjusted according to the size of the gas used for flotation, and completely replaces air or partially replaces air to be used as a flotation inflation gas source for flotation utilization.
To P2O5Collophanite with 22% of MgO content and 5.5% of air as bubble source to obtain concentrate index P2O529 percent of MgO content and 0.9 percent of tailing P2O5The content is 6.4%; by-product CO of phosphorus chemical industry2Gas as bubblesSource, obtained concentrate index P2O529.1 percent of the content, 0.86 percent of the content of MgO and tailings P2O5The content was 6.3%.
Example 2
A certain phosphating device is 80 million t/year of sulfuric acid, 30 million t/year of phosphoric acid and 50 million t/year of MDCP, 3 million tons/year of fire coal is needed, and CO is generated every year2Gas 10.8 million tons (CO)2In an amount of about 14 km3A); MDCP production of CO from calcium carbonate2Gas 10 ten thousand t/a, CO-production of CO2The gas is about 21 million t/a.
By-producing CO from phosphorus chemical industry2Introducing tail gas mainly containing gas into a gas treatment chamber from the bottom, and spraying by using a 1% lime water solution, wherein the spraying amount/air inflow in the alkali washing process is 1/6-1/2), when the tail gas washed by alkali liquor enters a gas collection chamber from the bottom, spraying tap water on the top of the gas collection chamber, and the spraying amount/air inflow in the tap water washing process is 1/4-1/2; washing the tail gas with primary alkali liquor and primary tap water, and cooling to 55-65 ℃; will contain CO2And a draft fan for introducing mixed gas mainly comprising gas is conveyed to a flotation plant of 450 ten thousand t, the mixed gas is directly introduced into a flotation device, and the mixed gas is adjusted according to the size of the gas used for flotation, and completely replaces air or partially replaces air to be used as a flotation inflation gas source for flotation utilization.
To P2O5Collophanite with 21 percent of MgO content and 5.5 percent of air is used as a bubble source to obtain a concentrate index P2O528 percent of MgO content and 0.9 percent of tailing P2O5The content is 6.2%; by-product CO of phosphorus chemical industry2Gas is used as bubble source, and the obtained concentrate index P2O528.2 percent of the content, 0.8 percent of the content of MgO and tailings P2O5The content is 6.0%.
Example 3
A certain phosphorization device comprises 30 million t/year of sulfuric acid, 10 million t/year of phosphoric acid and 10 million t/year of DAP20, 1 million tons/year of fire coal is needed, and CO is generated every year2Gas 3.6 million tons (CO)2In an amount of about 3.89 ten thousand m 3/a).
By-producing CO from phosphorus chemical industry2Introducing tail gas mainly containing gas into a gas treatment chamber from the bottom, and spraying by using a 1% sodium carbonate solution, wherein the spraying amount/air inflow in the alkali washing process is 1/8-1/6), when the tail gas washed by alkali liquor enters a gas collection chamber from the bottom, spraying tap water on the top of the gas collection chamber, and the spraying amount/air inflow in the tap water washing process is 1/10-1/8; washing the tail gas with primary alkali liquor and primary tap water, and cooling to 60-70 ℃; will contain CO2And a draft fan for introducing mixed gas mainly comprising gas is conveyed to a 50-kiloton flotation plant, the mixed gas is directly introduced into a flotation device, and the mixed gas is adjusted according to the size of the gas used for flotation, and completely replaces air or partially replaces air to be used as a flotation inflation gas source for flotation utilization.
To P2O5Collophanite with 24% of MgO content and air as bubble source to obtain concentrate index P2O531 percent of MgO, 0.8 percent of tailings P2O5The content is 7%; by-product CO of phosphorus chemical industry2Gas is used as bubble source, and the obtained concentrate index P2O531.2 percent of MgO, 0.76 percent of tailings P2O5The content was 6.5%.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts or arrangements, other uses will also be apparent to those skilled in the art.
Claims (4)
1. Phosphorus chemical industry by-product CO2The method for using the tail gas for phosphorite flotation is characterized by comprising the following steps:
s1, mixing CO2Introducing tail gas into the gas treatment chamber from the bottom, and spraying 1% alkaline solution on the top of the gas treatment chamber Liquid, alkaline solution to CO2Washing and cooling the tail gas in a counter-current manner;
s2, CO processed by step S12Tail gas enters the gas collecting chamber from the bottom, tap water is sprayed on the top of the gas collecting chamber, and the tap water is used for treating CO2Carrying out countercurrent washing and cooling on the tail gas to obtain mixed gas with the temperature of 50-70 ℃;
s3, the CO obtained in the step S22And introducing the tail gas into a flotation device through an exhaust fan or a compressor to be used as an air source for phosphorite flotation.
2. The method of claim 1, wherein the CO is derived from the chemical industry of phosphorus2The method for the tail gas to be used for the phosphorite flotation is characterized by comprising the following steps: the alkaline solution is sodium hydroxide, sodium carbonate or lime water solution.
3. The method of claim 1, wherein the CO is derived from the chemical industry of phosphorus2The method for the tail gas to be used for the phosphorite flotation is characterized by comprising the following steps: the CO is2The tail gas is the tail gas after burning coal for drying the phosphating products.
4. The method of claim 1, wherein the CO is derived from the chemical industry of phosphorus2The method for the tail gas to be used for the phosphorite flotation is characterized by comprising the following steps: the CO is2The tail gas is CaCO in the production of calcium phosphate feed3Tail gas after reaction with phosphoric acid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210275264.2A CN114669183B (en) | 2022-03-21 | 2022-03-21 | Byproduct CO of phosphorus chemical industry 2 Method for using tail gas for phosphorite flotation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210275264.2A CN114669183B (en) | 2022-03-21 | 2022-03-21 | Byproduct CO of phosphorus chemical industry 2 Method for using tail gas for phosphorite flotation |
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| Publication Number | Publication Date |
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| CN114669183A true CN114669183A (en) | 2022-06-28 |
| CN114669183B CN114669183B (en) | 2024-01-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101077775A (en) * | 2007-06-05 | 2007-11-28 | 浙江大学 | Method for reclaiming carbon dioxide from tail gas of calcium phosphate salt producing process |
| CN102482090A (en) * | 2009-06-09 | 2012-05-30 | 福斯弗蒂肥料股份有限公司 | Method for preparing apatite concentrate by flotation |
| US20130200182A1 (en) * | 2010-06-09 | 2013-08-08 | Sebastião Eduardo De Rezende | Process for obtaining apatite concentrates by froth flotation |
| CN203196509U (en) * | 2013-04-28 | 2013-09-18 | 大唐时代节能科技有限公司 | Yellow phosphorus tail gas purifying device |
| CN104925772A (en) * | 2015-05-06 | 2015-09-23 | 贵州省化工研究院 | Process for preparing phosphate concentrate and byproduct magnesium-containing calcium carbonate from medium-low-grade phosphorite |
| CN106906007A (en) * | 2017-03-02 | 2017-06-30 | 中南大学 | A kind of electron wastes pyrolysis gas cleaning system and its method for processing electron wastes pyrolysis gas |
-
2022
- 2022-03-21 CN CN202210275264.2A patent/CN114669183B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101077775A (en) * | 2007-06-05 | 2007-11-28 | 浙江大学 | Method for reclaiming carbon dioxide from tail gas of calcium phosphate salt producing process |
| CN102482090A (en) * | 2009-06-09 | 2012-05-30 | 福斯弗蒂肥料股份有限公司 | Method for preparing apatite concentrate by flotation |
| US20130200182A1 (en) * | 2010-06-09 | 2013-08-08 | Sebastião Eduardo De Rezende | Process for obtaining apatite concentrates by froth flotation |
| CN203196509U (en) * | 2013-04-28 | 2013-09-18 | 大唐时代节能科技有限公司 | Yellow phosphorus tail gas purifying device |
| CN104925772A (en) * | 2015-05-06 | 2015-09-23 | 贵州省化工研究院 | Process for preparing phosphate concentrate and byproduct magnesium-containing calcium carbonate from medium-low-grade phosphorite |
| CN106906007A (en) * | 2017-03-02 | 2017-06-30 | 中南大学 | A kind of electron wastes pyrolysis gas cleaning system and its method for processing electron wastes pyrolysis gas |
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