CN114669183B - Byproduct CO of phosphorus chemical industry 2 Method for using tail gas for phosphorite flotation - Google Patents
Byproduct CO of phosphorus chemical industry 2 Method for using tail gas for phosphorite flotation Download PDFInfo
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- CN114669183B CN114669183B CN202210275264.2A CN202210275264A CN114669183B CN 114669183 B CN114669183 B CN 114669183B CN 202210275264 A CN202210275264 A CN 202210275264A CN 114669183 B CN114669183 B CN 114669183B
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- tail gas
- gas
- flotation
- phosphorite
- tap water
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- 238000005188 flotation Methods 0.000 title claims abstract description 34
- 239000002367 phosphate rock Substances 0.000 title claims abstract description 21
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000011574 phosphorus Substances 0.000 title claims abstract description 18
- 239000000126 substance Substances 0.000 title claims abstract description 18
- 239000006227 byproduct Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 27
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000008399 tap water Substances 0.000 claims abstract description 17
- 235000020679 tap water Nutrition 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 239000012670 alkaline solution Substances 0.000 claims abstract description 10
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 10
- 239000003245 coal Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000000047 product Substances 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
- 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
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims 1
- 235000011941 Tilia x europaea Nutrition 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 claims 1
- 239000004571 lime Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 79
- 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
- 239000003513 alkali Substances 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 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
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910005965 SO 2 Inorganic materials 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
- 230000001105 regulatory effect Effects 0.000 description 2
- 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 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 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
- 230000007613 environmental effect Effects 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
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (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 by-product CO of phosphorus chemical industry 2 A method for using tail gas in phosphorite flotation relates to the technical field of phosphorite flotation. CO is processed by 2 Introducing tail gas into a gas treatment chamber from the bottom, spraying alkaline solution with concentration of 1% on the top of the gas treatment chamber, and treating CO by the alkaline solution 2 Countercurrent washing and cooling of tail gas; treated CO 2 Tail gas enters a 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 CO 2 Countercurrent washing and cooling are carried out on the tail gas, and the temperature of the obtained mixed gas is 50-70 ℃; CO is processed by 2 The tail gas is introduced into a flotation device through an exhaust fan or a compressor and is used as a gas source for phosphorite flotation. After burning the fire coal for drying the phosphating product, caCO in the production of calcium phosphate salt feed 3 CO-containing after reaction with phosphoric acid 2 The 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 2 And the tail gas is exhausted, so that the carbon emission is greatly reduced.
Description
Technical Field
The invention relates to the technical field of phosphorite flotation, in particular to a byproduct CO of a phosphorite chemical industry 2 The tail gas is used for phosphorite floatation.
Background
The low-grade phosphorite cannot be directly used for phosphoric acid production, phosphorus needs to be enriched through floatation, air is refilled into floatation equipment in the modes of compression and the like in phosphorite floatation operation, a large amount of bubbles are formed in the air, hydrophobic minerals mineralized by a floatation agent are taken away, and useful minerals and gangue minerals are effectively separated, so that phosphorus is recoveredAnd (5) carrying out floatation on the ore. In the phosphorus chemical industry, the heat of burning coal is needed to dry the product, while CaCO in the production of calcium phosphate salt feed 3 The reaction with phosphoric acid produces a corresponding fertilizer, and a large amount of CO is produced in the two processes 2 The tail gas after coal combustion also contains S, N and other gases, and the calcium phosphate salt reaction also contains a small amount of F-containing gas, so that most factories treat toxic components in the tail gas and CO 2 Direct evacuation measures are taken, but with a large amount of CO 2 The emission can directly aggravate the greenhouse effect, and the requirements of low carbon and environmental protection are not met.
Disclosure of Invention
The invention aims to provide a CO-product CO of a phosphorus chemical industry 2 Method for using tail gas for phosphorite flotation, and solves the problem of existing CO-containing method 2 The direct exhaust of the tail gas causes the problem of aggravation of greenhouse effect.
In order to solve the technical problems, the invention adopts the following technical scheme: byproduct CO of phosphorus chemical industry 2 The method for the phosphorite flotation by using the tail gas is characterized by comprising the following steps of:
s1, CO 2 Introducing tail gas into a gas treatment chamber from the bottom, spraying alkaline solution with concentration of 1% on the top of the gas treatment chamber, and treating CO by the alkaline solution 2 Countercurrent washing and cooling of tail gas;
s2, CO processed in the step S1 2 Tail gas enters a 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 CO 2 Countercurrent washing and cooling are carried out on the tail gas, and the temperature of the obtained mixed gas is 50-70 ℃;
s3, CO in the step S2 2 The tail gas is introduced into a flotation device through an exhaust fan or a compressor and is used as a gas source for phosphorite flotation.
The further technical proposal is that the alkaline solution is sodium hydroxide, sodium carbonate or lime water solution.
A further technical proposal is that the CO 2 The tail gas is the tail gas after the coal burning for drying the phosphating product.
A further technical proposal is that the CO 2 The tail gas is CaCO in the production of calcium phosphate salt feed 3 Tail gas after reaction with phosphoric acid.
Reaction mechanism:
tail gas (common CO in tail gas) from coal burning for drying phosphating products 2 The content is more than 30%, the temperature is more than 100deg.C, and the impurities mainly comprise ash, CO, NO, and NO 2 And SO 2 Etc., caCO in the production of calcium phosphate feed 3 Tail gas after reaction with phosphoric acid (general CO in tail gas) 2 The content is more than 30%, the temperature is more than 100deg.C, and the impurity is mainly ash, P, F and SO 2 The gas) is subjected to countercurrent washing by 1% alkaline solution (sodium hydroxide, sodium carbonate or lime water solution), substances removed in the washing process comprise ash, sulfide, phosphorus-containing fluorine-containing substances and the like, and the temperature of the tail gas after treatment is about 80%; the tail gas is countercurrent washed again by tap water (the tap water can dilute and neutralize alkaline or acid gas except for cooling, so as to prevent corrosion of gas transmission equipment), and the temperature of the tail gas is reduced 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: providing CO in the phosphorus chemical industry 2 Method for floating phosphorite by tail gas, which is to burn coal used for drying phosphorite products and CaCO in calcium phosphate salt feed production 3 CO-containing after reaction with phosphoric acid 2 The 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 2 And the tail gas is exhausted, so that the 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 further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Certain phosphating toolThe sulfuric acid is 80 ten thousand t/year, the phosphoric acid is 30 ten thousand t/year, the DAP is 60 ten thousand t/year, the coal is required to be burned for 3 ten thousand t/year, and CO is produced annually 2 10.8 ten thousand tons (CO) of gas 2 In an amount of about 14 ten thousand m 3 /a). By CO-producing phosphorus chemical by-products 2 Introducing the 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=1/10-1/4 in the alkaline washing process, and spraying tap water at the top of the gas collection chamber when the tail gas subjected to alkaline liquid washing enters the gas collection chamber from the bottom, wherein the spraying amount/air inflow=1/8-1/6 in the tap water washing process; washing the tail gas with alkali liquor for one time, washing with tap water, and cooling to 50-60 ℃; will contain CO 2 The exhaust fan introduced by the mixed gas mainly comprises air, is conveyed to a 100 ten thousand t flotation plant, is directly introduced into a flotation device, is regulated according to the air consumption of flotation, and completely replaces air or partially replaces air to be used as a flotation inflation air source for flotation utilization.
P pair P 2 O 5 Collophanite with 22 percent of content and 5.5 percent of MgO content, and air is used as a bubble source to obtain concentrate index P 2 O 5 29% of MgO and 0.9% of tailings P 2 O 5 The content is 6.4%; by-product CO of phosphorus chemical industry 2 The gas is used as a bubble source, and the obtained concentrate index P 2 O 5 29.1 percent of MgO, 0.86 percent of MgO, and P of tailings 2 O 5 The content was 6.3%.
Example 2
Some phosphating equipment is sulfuric acid 80 ten thousand t/year, phosphoric acid 30 ten thousand t/year and MDCP50 ten thousand t/year, and needs fire coal 3 ten thousand tons/year, and CO is produced annually 2 10.8 ten thousand tons (CO) of gas 2 In an amount of about 14 ten thousand m 3 A); MDCP utilizes calcium carbonate to produce CO 2 CO-production of CO with 10 ten thousand t/a gas 2 The gas was about 21 ten thousand t/a.
By CO-producing phosphorus chemical by-products 2 Introducing the tail gas mainly containing gas into a gas treatment chamber from the bottom, spraying by using a lime water solution with concentration of 1%, wherein the spraying amount/air inflow=1/6-1/2 in the alkaline washing process, and spraying tap water at the top of the gas collection chamber when the tail gas subjected to alkaline liquid washing enters the gas collection chamber from the bottom, so as to wash the tail gas with concentration of tap waterSpraying amount/air inflow=1/4-1/2 in the washing process; washing the tail gas with alkali liquor for one time, washing with tap water, and cooling to 55-65 ℃; will contain CO 2 The mixed gas mainly comprising gas is introduced into an exhaust fan and is conveyed to a 450 ten thousand t flotation plant, and is directly introduced into a flotation device, and the mixed gas is regulated according to the gas consumption of flotation, and completely replaces air or partially replaces air to be used as a flotation inflation gas source for flotation utilization.
P pair P 2 O 5 Collophanite with 21 percent of content and 5.5 percent of MgO content, and air is used as a bubble source to obtain concentrate index P 2 O 5 28% of MgO and 0.9% of tailings P 2 O 5 The content is 6.2%; by-product CO of phosphorus chemical industry 2 The gas is used as a bubble source, and the obtained concentrate index P 2 O 5 28.2 percent of MgO and 0.8 percent of MgO, and the tailing P 2 O 5 The content was 6.0%.
Example 3
Some phosphating equipment is sulfuric acid 30 ten thousand t/year, phosphoric acid 10 ten thousand t/year and DAP20 ten thousand t/year, and needs fire coal 1 ten thousand t/year to produce CO annually 2 Gas 3.6 ten thousand tons (CO) 2 The amount was about 3.89 km 3/a).
By CO-producing phosphorus chemical by-products 2 Introducing the tail gas mainly containing gas into a gas treatment chamber from the bottom, spraying by using 1% sodium carbonate solution, wherein the spraying amount/air inflow=1/8-1/6 in the alkaline washing process, and spraying tap water at the top of the gas collection chamber when the tail gas subjected to alkaline liquid washing enters the gas collection chamber from the bottom, wherein the spraying amount/air inflow=1/10-1/8 in the tap water washing process; washing the tail gas with alkali liquor for one time, washing with tap water, and cooling to 60-70 ℃; will contain CO 2 The mixed gas mainly comprising gas is introduced into an exhaust fan and is conveyed to a 50 ten thousand t flotation plant, and is directly introduced into a flotation device, and the air is completely replaced or partially replaced by air to be used as a flotation inflation gas source for flotation and utilization according to the air consumption for flotation.
P pair P 2 O 5 Collophanite with 24 percent of content and 5 percent of MgO content, and air is used as a bubble source to obtain concentrate index P 2 O 5 The content of the tailings is 31%, the MgO content is 0.8%P 2 O 5 The content is 7%; by-product CO of phosphorus chemical industry 2 The gas is used as a bubble source, and the obtained concentrate index P 2 O 5 The content of the tailings P is 31.2%, the MgO content is 0.76% 2 O 5 The 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 scope and spirit of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts or arrangements of the subject combination arrangement within the scope of the disclosure, drawings and claims of this application. In addition to variations and modifications in the component parts or arrangements, other uses will be apparent to those skilled in the art.
Claims (2)
1. Byproduct CO of phosphorus chemical industry 2 The method for the phosphorite flotation by using the tail gas is characterized by comprising the following steps of:
s1, CO 2 Introducing tail gas into a gas treatment chamber from the bottom, spraying alkaline solution with concentration of 1% on the top of the gas treatment chamber, and treating CO by the alkaline solution 2 Countercurrent washing and cooling of tail gas; CO 2 The tail gas is the tail gas after the coal burning for drying the phosphating product and CaCO in the production of calcium phosphate salt feed 3 Tail gas after reaction with phosphoric acid; the alkaline solution is sodium carbonate solution;
s2, CO processed in the step S1 2 Tail gas enters a 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 CO 2 Countercurrent washing and cooling are carried out on the tail gas, and the temperature of the obtained mixed gas is 50-70 ℃;
s3, CO in the step S2 2 Introducing the tail gas into a flotation device through an exhaust fan or a compressor to serve as a gas source for phosphorite flotation; spray amount/air inflow=1/6-1/2 in alkaline washing process, and spray amount/air inflow=1/4-1/2 in tap water washing process.
2. According to claim1 in a phosphorus chemical plant CO 2 The method for the phosphorite flotation by using the tail gas is characterized by comprising the following steps of: the alkaline solution may also be an aqueous solution of sodium hydroxide or lime.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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 CN114669183A (en) | 2022-06-28 |
| CN114669183B true CN114669183B (en) | 2024-01-26 |
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| CN202210275264.2A Active 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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Citations (5)
| 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 | Process for obtaining apatite concentrates by 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130200182A1 (en) * | 2010-06-09 | 2013-08-08 | Sebastião Eduardo De Rezende | Process for obtaining apatite concentrates by froth flotation |
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2022
- 2022-03-21 CN CN202210275264.2A patent/CN114669183B/en active Active
Patent Citations (5)
| 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 | Process for obtaining apatite concentrates by 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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