EP4200067A1 - Apparatus for producing alkali hydroxide pellets - Google Patents
Apparatus for producing alkali hydroxide pelletsInfo
- Publication number
- EP4200067A1 EP4200067A1 EP21766576.9A EP21766576A EP4200067A1 EP 4200067 A1 EP4200067 A1 EP 4200067A1 EP 21766576 A EP21766576 A EP 21766576A EP 4200067 A1 EP4200067 A1 EP 4200067A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alkali hydroxide
- temperature
- alkali
- pelletising
- pellets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001854 alkali hydroxide Inorganic materials 0.000 title claims abstract description 56
- 150000008044 alkali metal hydroxides Chemical class 0.000 title claims abstract description 56
- 239000008188 pellet Substances 0.000 title claims abstract description 37
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 description 11
- 235000011121 sodium hydroxide Nutrition 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- -1 flakes Chemical class 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/20—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by expressing the material, e.g. through sieves and fragmenting the extruded length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/22—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by pressing in moulds or between rollers
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/44—Preparation in the form of granules, pieces, or other shaped products
Definitions
- the invention relates to an apparatus for pelletising alkali hydroxides.
- the apparatus comprises a housing, a pelletising unit with a rotating pressing element and a die plate or die cylinder, a feeding line for feeding alkali hydroxide into the pellet press, and an alkali hydroxide pellet receiving unit.
- Flakes of alkali hydroxides, in particular sodium hydroxide are produced by immersing the lower part of a slowly rotating water cooled metal cylinder into a molten sodium hydroxide bath. The melt adheres to the cylinder surface and freezes outside the bath. Before the metal cylinder immerses again into the bath, the solid alkali hydroxide coat is peeled off with a knife to form flakes.
- Flakes have the disadvantage to break easily and to form dust when moved. Upon storage, for example in silos, they tend to aggregate and form compact masses.
- solid alkali hydroxides are prills, which are formed from molten alkali hydroxide droplets, which are solidified in a stream of cold air. This technique requires large towers and large quantities of cooling air, going along with high investments into equipment.
- a mechanically more convenient form for storing and handling alkali hydroxides, in particular sodium hydroxide, would be cylindrical pellets.
- Pelletising on an industrial scale is known from other technical fields, specifically from the production of animal feed pellets. It would be desirable to have a pelletiser designed to form alkali hydroxide pellets. Such a pelletiser should take account of the particular properties and requirements of alkali hydroxides and the specifics of their handling.
- solid alkali hydroxides are extremely hygroscopic. They take up water from the atmosphere upon every contact, resulting in the formation of a brine film on the surface, which enhances aggregation and compacting. In the presence of more humidity, rapidly liquid caustic is formed.
- alkali hydroxides in solid form are brittle, which prevents them from being deformed under pressure. Instead, alkali hydroxide flakes break. In a conventional pelletiser, solid alkali hydroxide flakes would be rapidly converted into dust instead of becoming pelletised.
- alkali hydroxides are highly reactive.
- Caustic soda reacts with glass, aluminium, iron, to name only few materials.
- alkali hydroxides can be easily pelletised, when heated to a plasticising temperature, a temperature, which is much lower than the melting temperature.
- the plasticising temperature is in the range of 63°C to 95°C, where solid sodium hydroxide becomes ductile. This temperature range would allow to pelletise sodium hydroxides in a conventional pelletiser, as used in the food industry.
- the plasticising temperature for potassium hydroxide is in the same range.
- the present invention provides an apparatus for pelletising alkali hydroxides comprising a housing, a pelletising unit with a rotating pressing element and a die plate or die cylinder, a feeding line for feeding alkali hydroxide into the pellet press, and alkali hydroxide pellets receiving unit and a supply of nitrogen or dry air into the housing.
- such apparatus is made from stainless steel.
- the pelletising unit is a more or less conventional one, where the alkali hydroxide to be pelletised is fed in in solid form and pressed by a rotating element through dies in a die plate or in a die cylinder.
- a housing is necessary and a supply of dry air, where the humidity is reduced to a level insufficient for the formation of brine.
- the relative humidity of the dry air should be 30%, preferably 20% or less, corresponding to a dew point of 4 to 8°C for air at room temperature.
- the elevated temperature which is necessary for the alkali hydroxide to become ductile, is frequently provided by the process heat, which results from the friction in the pelletising press.
- this heat will not be sufficient to provide the necessary temperature, for example more than 63°C for sodium hydroxide. Therefore, it is preferred and sometimes necessary to provide a heating unit for heating either the alkali hydroxide feed and/or the pelletising unit.
- the alkali hydroxide feed can consist of all solid forms of alkali hydroxide, such as flakes, dust or prills.
- the pelletising process can be integrated in any production process for solid alkali hydroxide and make use of residues from other production forms, such as flakes and prills.
- the solid alkali hydroxide is fed into a commercially pellet press arranged in a housing with a dry air supply, where a rotating pressing element pushes the pressing good through the holes of a die plate or a die cylinder.
- the continuously extruded alkali hydroxide cylinders leaving the die are periodically cut off with a mechanical device, such as a knife, to limit the length of the cylindrical pellets, as desired.
- a mechanical device such as a knife
- the raw pellets leave the pellet press by gravity and are classified by size in a classifying unit comprising one or more sieves. Undersize fractions are returned to the feeding line, the fraction having the right size is collected in a container or a bag for further handling or storage.
- the raw pellets should have a temperature below the plasticising temperature, preferably below 55°C, to avoid further deformation.
- Alkali hydroxide pellets in particular sodium hydroxide pellets have a good pressure resistance and can be stored in silos without compacting or aggregating.
- the pallets can be transported and handled without dust formation. This allows every kind of transport, silos storage and packing.
- the invention also relates to a process, wherein solid alkali hydroxide of any form and from any production process is heated or cooled to the plasticising temperature, in particular between 63°C and 95°C, is fed into a pellet press and pelletised in an atmosphere of dry nitrogen or dry air.
- the feed and/or pellet press may be heated to the plasticising temperature.
- the pellets formed in the pellet press are sieved on a mesh with mesh size, which is preferably slightly below the desired pellet diameter, for undersize material separation.
- the pellets are cooled down below the plasticising temperature, for sodium hydroxide preferably below 55°C.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Glanulating (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to an an apparatus for pelletising alkali hydroxides comprising – a housing, – a pelletising unit with a rotating pressing element and die plate or die cylinder, – a feeding line for feeding alkali hydroxide into the pellet press, – an alkali hydroxide pellet receiving unit, characterised by a supply of dry air or nitrogen into the housing.
Description
Apparatus for producing alkali hydroxide pellets
The invention relates to an apparatus for pelletising alkali hydroxides. The apparatus comprises a housing, a pelletising unit with a rotating pressing element and a die plate or die cylinder, a feeding line for feeding alkali hydroxide into the pellet press, and an alkali hydroxide pellet receiving unit.
Flakes of alkali hydroxides, in particular sodium hydroxide are produced by immersing the lower part of a slowly rotating water cooled metal cylinder into a molten sodium hydroxide bath. The melt adheres to the cylinder surface and freezes outside the bath. Before the metal cylinder immerses again into the bath, the solid alkali hydroxide coat is peeled off with a knife to form flakes.
Flakes have the disadvantage to break easily and to form dust when moved. Upon storage, for example in silos, they tend to aggregate and form compact masses.
Other forms of solid alkali hydroxides are prills, which are formed from molten alkali hydroxide droplets, which are solidified in a stream of cold air. This technique requires large towers and large quantities of cooling air, going along with high investments into equipment.
A mechanically more convenient form for storing and handling alkali hydroxides, in particular sodium hydroxide, would be cylindrical pellets.
Pelletising on an industrial scale is known from other technical fields, specifically from the production of animal feed pellets. It would be desirable to have a pelletiser designed to form alkali hydroxide pellets. Such a pelletiser should take account of the particular properties and requirements of alkali hydroxides and the specifics of their handling.
First, solid alkali hydroxides are extremely hygroscopic. They take up water from the atmosphere upon every contact, resulting in the formation of a brine film on the surface, which enhances aggregation and compacting. In the presence of more humidity, rapidly liquid caustic is formed.
Secondly, alkali hydroxides in solid form are brittle, which prevents them from being deformed under pressure. Instead, alkali hydroxide flakes break. In a conventional pelletiser, solid alkali hydroxide flakes would be rapidly converted into dust instead of becoming pelletised.
Finally, alkali hydroxides are highly reactive. Caustic soda reacts with glass, aluminium, iron, to name only few materials. Care hast o be taken to select resistant materials for storing and handling alkali hydroxides. Suitable materials are e.g. steinless steel variaties and polyalkylenes.
It has now been found that alkali hydroxides can be easily pelletised, when heated to a plasticising temperature, a temperature, which is much lower than the melting temperature. For sodium hydroxide, the plasticising temperature is in the range of 63°C to 95°C, where solid sodium hydroxide becomes ductile. This temperature range would allow to pelletise sodium hydroxides in a conventional pelletiser, as used in the food industry. The plasticising temperature for potassium hydroxide is in the same range.
Of course, the hygroscopic nature of alkali hydroxides has to be taken in account. This requires a pelletiser to be closed off from humid air.
Accordingly, the present invention provides an apparatus for pelletising alkali hydroxides comprising a housing, a pelletising unit with a rotating pressing element and a die plate or die cylinder, a feeding line for feeding alkali hydroxide into the pellet press, and alkali hydroxide pellets receiving unit and a supply of nitrogen or dry air into the housing.
In particular, such apparatus is made from stainless steel.
The pelletising unit is a more or less conventional one, where the alkali hydroxide to be pelletised is fed in in solid form and pressed by a rotating element through dies in a die plate or in a die cylinder. However, in order to take account of the hygroscopic nature of the alkali hydroxide, a housing is necessary and a supply of dry air, where the humidity is reduced to a level insufficient for the formation of brine. At most, the relative humidity of the dry air should be
30%, preferably 20% or less, corresponding to a dew point of 4 to 8°C for air at room temperature.
The elevated temperature, which is necessary for the alkali hydroxide to become ductile, is frequently provided by the process heat, which results from the friction in the pelletising press. However, in the initial stage, at low rotating speeds and with large diameters of the pellets formed this heat will not be sufficient to provide the necessary temperature, for example more than 63°C for sodium hydroxide. Therefore, it is preferred and sometimes necessary to provide a heating unit for heating either the alkali hydroxide feed and/or the pelletising unit.
The alkali hydroxide feed can consist of all solid forms of alkali hydroxide, such as flakes, dust or prills. The pelletising process can be integrated in any production process for solid alkali hydroxide and make use of residues from other production forms, such as flakes and prills.
In a process for producing alkali hydroxide pellets, the solid alkali hydroxide is fed into a commercially pellet press arranged in a housing with a dry air supply, where a rotating pressing element pushes the pressing good through the holes of a die plate or a die cylinder. The continuously extruded alkali hydroxide cylinders leaving the die are periodically cut off with a mechanical device, such as a knife, to limit the length of the cylindrical pellets, as desired. Normally, the diameter of the pellets will be in the range of 1 mm to 8 mm and the lengths in between 0.5 to 2.0 diameters.
The raw pellets leave the pellet press by gravity and are classified by size in a classifying unit comprising one or more sieves. Undersize fractions are returned to the feeding line, the fraction having the right size is collected in a container or a bag for further handling or storage. In the classifying unit, the raw pellets should have a temperature below the plasticising temperature, preferably below 55°C, to avoid further deformation.
Therefore it may be necessary to cool the pellets down after formation, for example in a stream of cold dry air.
Alkali hydroxide pellets, in particular sodium hydroxide pellets have a good pressure resistance and can be stored in silos without compacting or aggregating. The pallets can be transported
and handled without dust formation. This allows every kind of transport, silos storage and packing.
The invention also relates to a process, wherein solid alkali hydroxide of any form and from any production process is heated or cooled to the plasticising temperature, in particular between 63°C and 95°C, is fed into a pellet press and pelletised in an atmosphere of dry nitrogen or dry air. The feed and/or pellet press may be heated to the plasticising temperature. The pellets formed in the pellet press are sieved on a mesh with mesh size, which is preferably slightly below the desired pellet diameter, for undersize material separation. In order to avoid further deformation of the pellets, the pellets are cooled down below the plasticising temperature, for sodium hydroxide preferably below 55°C.
Claims
1 . An apparatus for pelletising alkali hydroxides comprising
- a housing,
- a pelletising unit with a rotating pressing element and die plate or die cylinder, - a feeding line for feeding alkali hydroxide into the pellet press,
- an alkali hydroxide pellet receiving unit, characterised by a supply of dry air or nitrogen into the housing.
2. The apparatus of claim 1 , wherein the alkali hydroxide is sodium hydroxide.
3. The apparatus of claim 1 comprising an air dryer designed to supply dry air with a relative humidity of at most 30%.
4. The apparatus of claim 1 , wherein the dried air has a dew point of 4 to 8°C, the dried air having room temperature.
5. The apparatus of claim 1 additionally comprising a classifying system for separating the alkali hydroxide pellets into undersize material, and material having the desired size.
6. The apparatus of claim 1 additionally comprising a cooling unit for cooling the alkali hydroxide pellets down below the plastification temperature.
6
7. The apparatus of claim 1 additionally comprising a heating unit designed to provide a temperature, at which the alkali hydroxide to be pelletised becomes ductile.
8. The apparatus of claim 7, wherein the heating unit provides heat to the alkali hydroxide feed.
9. The apparatus of claim 7 or 8, wherein the heating unit provides heat to the pelletising unit.
10. The apparatus of claim 7, wherein the alkali hydroxide is sodium hydroxide and the temperature is in the range of 63°C to 95°C.
11. The apparatus of claim 5, wherein the undersize material is recycled to the pelletising unit.
12. The apparatus of claim 1 , wherein the dies of the die plate or die cylinder are designed to provide pellets with a diameter in the range of 1 mm to 8 mm.
13. The apparatus of claim 12 additionally comprising a knife for periodically cutting extruded alkali hydroxide pellets.
14. The apparatus of claim 13, wherein the alkali hydroxide pellets are cut to a length of 0.5 to 2.0 diameters.
15. A process for pelletising alkali hydroxides comprising the steps of
- Providing alkali hydroxide at a temperature, where it is ductile,
- Feeding the alkali hydroxide in ductile form to a pellet press,
- Pelletising the alkali hydroxide and an atmosphere of dry nitrogen or dry air,
- Classifying and collecting the pelletised alkali hydroxide.
7
16. The process of claim 15 carried out and the dry air at a relative humidity of less then 30%.
17. The process of claim 15, wherein the pelletised alkali hydroxide is cooled down to a temperature below the plasticising temperature before being classified.
18. The process of claim 15, wherein the temperature of the alkali hydroxide is 63 to
95°C.
- abstract -
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010849034.3A CN114073915A (en) | 2020-08-21 | 2020-08-21 | Device for producing alkali metal hydroxide particles |
| PCT/EP2021/072737 WO2022038092A1 (en) | 2020-08-21 | 2021-08-16 | Apparatus for producing alkali hydroxide pellets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4200067A1 true EP4200067A1 (en) | 2023-06-28 |
Family
ID=77693478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21766576.9A Pending EP4200067A1 (en) | 2020-08-21 | 2021-08-16 | Apparatus for producing alkali hydroxide pellets |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4200067A1 (en) |
| CN (2) | CN114073915A (en) |
| WO (1) | WO2022038092A1 (en) |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1235479A (en) * | 1959-05-27 | 1960-07-08 | Method and apparatus for the production of metallic oxygenates, in particular alkali and alkaline earth metals as well as rare earth metals | |
| GB937447A (en) * | 1960-08-15 | 1963-09-18 | Ici Australia Ltd | Improvements in and relating to the pelleting of prillable chemical materials |
| CH439238A (en) * | 1964-06-17 | 1967-07-15 | Bertrams Ag Hch | Machine for generating NaOH flakes from liquid melt |
| LU52971A1 (en) * | 1966-02-12 | 1967-04-10 | ||
| DE1567927B2 (en) * | 1966-02-12 | 1971-10-21 | Dynamit Nobel Ag, 5210 Troisdorf | METHOD FOR MANUFACTURING SHAPED BODIES FROM ALKALINE HYDROXIDES |
| CA1027323A (en) * | 1968-09-05 | 1978-03-07 | Edward M. Allen | Production of caustic soda prills |
| DE2003501B2 (en) * | 1970-01-27 | 1974-11-28 | Chemische Fabrik Kalk Gmbh, 5000 Koeln | Process for the production of dry, free-flowing granules consisting essentially of sodium carbonate and sodium hydroxide |
| YU40187B (en) * | 1978-03-31 | 1985-08-31 | Magnezitipari Muevek | Process for preparing magnesium oxide briquettes |
| CN2037735U (en) * | 1988-02-05 | 1989-05-17 | 杭州龙山化工厂 | Granulator for ammonium-chloride monomer |
| JPH0360425A (en) * | 1989-07-28 | 1991-03-15 | Tsurumi Soda Kk | Granulating method of caustic alkali |
| CA2024966C (en) * | 1989-10-25 | 1995-07-18 | Gunther Schimmel | Process for producing sodium silicates |
| CN2155942Y (en) * | 1992-07-28 | 1994-02-16 | 天津市汉沽区建华烧碱厂 | Prill machine for caustic soda shaping |
| DE19647313A1 (en) * | 1996-11-13 | 1998-05-14 | Siemens Ag | Method and device for the directional solidification of a melt |
| CN1193977C (en) * | 2003-08-28 | 2005-03-23 | 付炳忠 | Process for preparing granular patassium formate and its pelletizing equipment |
| FR2887247B1 (en) * | 2005-06-15 | 2007-10-12 | Snpe Materiaux Energetiques | PROCESS FOR MANUFACTURING GAS GENERATOR PELLETS COMPRISING A DRY GRANULATION STEP |
| US8951562B2 (en) * | 2006-11-10 | 2015-02-10 | Atacama Labs Oy | Method and apparatus or dry granulation |
| CN101200296A (en) * | 2006-12-12 | 2008-06-18 | 天津市云海碳素制品有限公司 | Device for producing granulated alkali |
| JP5618947B2 (en) * | 2011-08-23 | 2014-11-05 | ダイオーエンジニアリング株式会社 | Pellet manufacturing equipment |
| CN102553492B (en) * | 2012-01-17 | 2014-03-26 | 上海五四化学试剂有限公司 | Granulator for soda lime and calcium lime and preparing method of granulator |
| AT513566B1 (en) * | 2012-10-25 | 2015-04-15 | Bertrams Chemieanlagen Ag | Process for granulating fusible materials |
| DE102014014099A1 (en) * | 2014-09-30 | 2016-03-31 | K + S Kali Gmbh | Process for the preparation of potassium sulfate granules and the potassium sulphate granules obtained therefrom, and the use thereof |
| CN109553118B (en) * | 2018-12-19 | 2021-03-16 | 江西赣锋锂业股份有限公司 | Method for industrially producing anhydrous lithium hydroxide balls |
-
2020
- 2020-08-21 CN CN202010849034.3A patent/CN114073915A/en active Pending
-
2021
- 2021-08-16 EP EP21766576.9A patent/EP4200067A1/en active Pending
- 2021-08-16 WO PCT/EP2021/072737 patent/WO2022038092A1/en unknown
- 2021-08-16 CN CN202180051093.9A patent/CN115867513A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN114073915A (en) | 2022-02-22 |
| CN115867513A (en) | 2023-03-28 |
| WO2022038092A1 (en) | 2022-02-24 |
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