FI131138B1 - Treatment of green liquor - Google Patents
Treatment of green liquor Download PDFInfo
- Publication number
- FI131138B1 FI131138B1 FI20225281A FI20225281A FI131138B1 FI 131138 B1 FI131138 B1 FI 131138B1 FI 20225281 A FI20225281 A FI 20225281A FI 20225281 A FI20225281 A FI 20225281A FI 131138 B1 FI131138 B1 FI 131138B1
- Authority
- FI
- Finland
- Prior art keywords
- green liquor
- dregs
- liquor dregs
- calcined
- flotation process
- Prior art date
Links
- 238000000034 method Methods 0.000 claims abstract description 48
- 238000005188 flotation Methods 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 30
- 238000005065 mining Methods 0.000 claims abstract description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 29
- 239000000292 calcium oxide Substances 0.000 claims description 17
- 235000012255 calcium oxide Nutrition 0.000 claims description 17
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 235000010755 mineral Nutrition 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229910052592 oxide mineral Inorganic materials 0.000 claims description 4
- 239000003002 pH adjusting agent Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 2
- 239000002699 waste material Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 229960004424 carbon dioxide Drugs 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 150000002736 metal compounds Chemical class 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 150000001399 aluminium compounds Chemical class 0.000 description 1
- 229940077746 antacid containing aluminium compound Drugs 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910001779 copper mineral Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003455 independent Effects 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/006—Hydrocarbons
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0007—Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/02—Oxides or hydroxides
- C01F11/04—Oxides or hydroxides by thermal decomposition
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
- D21C11/0078—Treatment of green or white liquors with other means or other compounds than gases, e.g. in order to separate solid compounds such as sodium chloride and carbonate from these liquors; Further treatment of these compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/007—Modifying reagents for adjusting pH or conductivity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; Specified applications
- B03D2203/02—Ores
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Paper (AREA)
Abstract
A method is disclosed for treatment and utilization of green liquor dregs. The method comprises obtaining green liquor dregs originating from a pulp process. The green liquor dregs are dried at a temperature of 95 to 120 °C, preferably at 100 °C, to obtain dried green liquor dregs. The dried green liquor dregs are calcined for 1 to 4 hours, preferably for 2 hours, at a temperature of 800 to 1200 °C, preferably at 800 to 1000 °C, to obtain calcined green liquor dregs. The calcined green liquor dregs are used to control the pH of a flotation process in mining industry.
Description
TREATMENT OF GREEN LIQUOR
The invention relates to treatment of green liquor dregs, and particu- larly to a method for treatment of green liquor dregs.
Green liquor is residue produced in pulp production. Green liquor dregs originate from recovered cooking chemicals of pulp. Additionally green liquor dregs may contain organic wood-based matter and metal compounds such as alu- minium compounds. Currently, there is no definitive solution to the problem of uti- lization of green liquor dregs. Instead, green liquor dregs or sludge are still being disposed as waste.
The following presents a simplified summary of features disclosed herein to provide a basic understanding of some exemplary aspects of the inven- — tion. This summary is not an extensive overview of the invention. It is not intended to identify key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts disclosed herein in a sim- plified form as a prelude to a more detailed description.
According to an aspect, there is provided the subject matter of the inde- pendent claims. Embodiments are defined in the dependent claims.
One or more examples of implementations are set forth in more detail in the description below. Other features will be apparent from the description, and from the claims.
N
O DETAILED DESCRIPTION OF EMBODIMENTS se 25 The following embodiments are exemplary. Although the specification — may refer to “an”, “one”, or “some” embodiment(s) in several locations, this does 2 not necessarily mean that each such reference is to the same embodiment(s), or
E that the feature only applies to a single embodiment. Single features of different © embodiments may also be combined to provide other embodiments. Furthermore, io 30 — words “comprising”, “containing” and “including” should be understood as not lim-
O iting the described embodiments to consist of only those features that have been mentioned and such embodiments may contain also features/structures that have not been specifically mentioned.
Green liquor dregs originate from the chemical recovery cycle where effective cooking chemicals sodium hydroxide and sodium sulphide are regener- ated from black liquor. Green liquor dregs are the insoluble materials in the green liquor after it has been produced by dissolving the molten smelt from the recovery boiler in weak wash in a pulp process. Green liquor dregs consist of water, typically 40-60 %, unburned carbon (char), organic matter and insoluble impurities, mostly calcium carbonate, sulphides, and iron and other metal compounds which mustbe removed from green liquor. Dregs are typically produced at the rate of 4 to 6 kg per ton of unbleached pulp. Green liquor dregs may be in a form of sludge, slurry, and/or precipitate.
Burnt lime is typically used as a pH adjuster in flotation process in min- ing industry.
In the present invention, instead of burnt lime, green liquor dregs are used as a pH modifier in a mining industry flotation process. Green liquor dregs or green liquor sludge are a strongly alkaline type of waste material produced in the forest industry. In Finland about 100 000 tonnes of green liquor dregs are pro- duced every year.
The present invention enables the mining industry to use calcium oxide produced from green liquor dregs obtained as a waste in the forest industry instead of calcium oxide refined from the primary raw material. Utilizing the green liquor dregs in the mining industry enables recycling the green liquor waste material.
The present invention discloses a method for utilizing calcined green liquor dregs as a substitute for calcium oxide in flotation.
The use of a calcined green liquor dregs as a pH modifier for flotation — process enables to avoid the disposal of green liquor dregs as waste and the disso-
N lution of potentially harmful substances. The green liguor dregs are mostly used as
AN a pH regulator in the flotation processes, especially in concentration of sulphide
N minerals. ? The present invention provides advantages both to the mining and for- 2 30 — estry industry. Flotation of the green liquor dregs solve at least two problems. The
E largest unused fraction of waste from the forest industry can be recovered as a sub- — stitute for burnt lime in the flotation enrichment process of the mining industry.
S The mining industry is able to replace primarily used expensive burnt lime with
N calcinated green liguor dregs. At the same time, most of carbon dioxide emissions
N 35 from the production of burnt lime can be avoided.
Advantages of using a green liquor dregs include that a huge amount of waste generated in the forest industry can be utilized in the mining industry. The mining industry is able to give up an equivalent amount of primary raw materials that is, mining and refining limestone to produce burnt lime. The generation of car- bon dioxide in the production of burnt lime can be avoided (0.95-1.35 tonnes of
COgz per tonne of burnt lime).
Utilization of green liquor dregs for use in the mining industry is highly profitable. The use of green liquor dregs for the mining industry is much easier compared to other potential applications.
In the present invention, prior to the flotation process, the green liquor dregs are dried at 95-120 °C, preferably at 100 °C. The dried matter is calcined for atleast 1 hour, preferably for 1-4 hours, more preferably for 2 hours, at 800-1200 °C, preferably at 800-1000 °C, and the calcined product is optionally ground to break up large particles into smaller particles. The optionally ground calcined green liquor dregs are used, optionally dissolved in water or mixed with burnt lime, to control the pH in the grinding or conditioning stage or in the flotation cells of the flotation process. Alternatively, the use of calcined green liquor dregs in solid form as a powder for the pH control, is also possible.
The calcined green liquor dregs are used to control the pH of a grinding stage and/or a conditioning stage, and/or the pH in a flotation cell of the flotation process ata pH value of 12, or at any value higher than a natural pH of an ore slurry.
In copper mineral flotation, the target pH value of the copper ore slurry in the conditioning stage of the flotation process is typically 12.
The calcinated green liquor dregs together with water forms a saturated solution having a pH of 14, which is particularly suitable for pH control in copper enrichment. In addition, sodium sulphide contained in the green liquor dregs acts
N as a depressant to increase the selectivity of the flotation of sulphide minerals, and
O thereby improves the guality of the concentrate. The calcinated green liguor dregs > may replace both burnt lime and sodium cyanide as the depressant in flotation of ? sulphide minerals. 2 30 For example, in the calcining step, calcium carbonate decomposes into
E calcium oxide and carbon dioxide. The calcium oxide thus formed is then mixed — with water to form a saturated aqueous solution of calcium hydroxide which is & used in the pH control of the flotation process of sulphide minerals in the mining
N industry.
N 35 Calcinated green liguor dregs may be used in concentration of copper containing sulphide ores, or in concentration ofnickel containing sulphide ores, for example. Also, calcinated green liquor dregs may be used as pH regulator in the flotation of any multi metal oxide or sulphide ore containing valuable metals. The aim is then to increase the pH from its natural pH value to value high enough for achieving a good selectivity in the concentration process.
The flotation process may be a flotation process of an ore containing sulphide and/or oxide minerals. The ore containing sulphide and/or oxide miner- als may be an ore containing copper, nickel and/or any valuable multi metal min- erals.
Converting the green liquor residue to a sustainable product by the pre- — sentinvention is advantageous as regards to material utilization in circular econ- omy.
It will be obvious to a person skilled in the art that, as the technology advances, the inventive concept can be implemented in various ways. The inven- tion and its embodiments are not limited to the examples described above but may — vary within the scope of the claims.
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Claims (14)
1. A method for treatment and utilization of green liquor dregs, the method comprising obtaining green liquor dregs originating from a pulp process; 5 drying the green liquor dregs at a temperature of 95 to 120 °C, prefera- bly at 100 °C, to obtain dried green liquor dregs; calcining dried green liquor dregs for 1 to 4 hours, preferably for 2 hours, at a temperature of 800 to 1200 °C, preferably at 800 to 1000 °C, to obtain calcined green liquor dregs; using the calcined green liquor dregs to control the pH of a flotation pro- cess in mining industry.
2. A method according to claim 1, wherein the method comprises grind- ing the calcined green liquor dregs to decrease the particle size of the calcined green liquor dregs, before they are used to control the pH of the flotation process in the mining industry.
3. A method according to claim 1 or 2, wherein the calcined green liquor dregs are dissolved in water, before they are used to control the pH of the flotation process in the mining industry.
4. A method according to claim 1, 2 or 3, wherein the calcined green lig- — uor dregs are dissolved in water to obtain an aqueous solution with a pH value of 14, wherein the aqueous solution is used to control the pH of the flotation process in the mining industry.
5. A method according to claim 1, 2 or 3, wherein the calcined green lig- uor dregs are mixed with burnt lime, before they are used to control the pH of the flotation process in the mining industry.
N 6. A method according to claim 1 or 2, wherein the calcined green liguor N dregs are used in solid form to control the pH of the flotation process in the mining <Q industry.
N 7. A method according to any of the preceding claims, wherein the flo- E 30 tation process is a flotation process of an ore containing sulphide and/or oxide — minerals.
N 8. A method according to claim 7, wherein the ore containing sulphide N and/or oxide minerals is an ore containing copper, nickel and/or any valuable N multi metal minerals.
9. A method according to any of the preceding claims, wherein the drying of the green liquor dregs is carried out by using hot air.
10. A method according to any of the preceding claims, wherein the cal- cined green liquor dregs are used to control the pH of a grinding stage and/or a conditioning stage, and/or the pH in a flotation cell of the flotation process.
11. A method according to claim 10, wherein the pH is controlled to be ata pH value of 12, or at any value higher than a natural pH of an ore slurry.
12. Use of green liquor dregs for controlling the pH of a flotation process in mining industry, wherein the green liquor dregs are obtained, originating from a pulp production process; the green liquor dregs are dried at a temperature of 95 to 120 °C, pref- erably at 100 °C, to obtain dried green liquor dregs; dried green liquor dregs are calcined for 1 to 4 hours, preferably for 2 hours, at a temperature of 800 to 1200 °C, preferably at 800 to 1000 °C, to obtain calcined green liquor dregs; the calcined green liquor dregs are used for the controlling of the pH of the flotation process.
13. Use of green liquor dregs for controlling the pH of a flotation process in mining industry according to any of the preceding claims.
14. pH modifier of a mining industry flotation process, containing cal- cined green liquor dregs produced by the method according to any of the preceding claims 2, 3, 5 or 6, dissolved in water or in solid form as a powder, and/or mixed with burnt lime. i N O N © I O N I = © N LO N N O N
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20225281A FI131138B1 (en) | 2022-03-31 | 2022-03-31 | Treatment of green liquor |
| PCT/FI2023/050179 WO2023187259A1 (en) | 2022-03-31 | 2023-03-30 | Treatment of green liquor dregs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20225281A FI131138B1 (en) | 2022-03-31 | 2022-03-31 | Treatment of green liquor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FI20225281A1 FI20225281A1 (en) | 2023-10-01 |
| FI131138B1 true FI131138B1 (en) | 2024-10-25 |
Family
ID=85979484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI20225281A FI131138B1 (en) | 2022-03-31 | 2022-03-31 | Treatment of green liquor |
Country Status (2)
| Country | Link |
|---|---|
| FI (1) | FI131138B1 (en) |
| WO (1) | WO2023187259A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1860570A (en) * | 1926-07-02 | 1932-05-31 | Bradley Mckeefe Corp | Manufacture of pulp, etc. |
| US20080219912A1 (en) * | 2007-03-06 | 2008-09-11 | Gary Allen Olsen | Particulate matter and methods of obtaining same from a kraft waste reclamation |
-
2022
- 2022-03-31 FI FI20225281A patent/FI131138B1/en active
-
2023
- 2023-03-30 WO PCT/FI2023/050179 patent/WO2023187259A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023187259A1 (en) | 2023-10-05 |
| FI20225281A1 (en) | 2023-10-01 |
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