CN115867513A - Device for producing alkali metal hydroxide particles - Google Patents
Device for producing alkali metal hydroxide particles Download PDFInfo
- Publication number
- CN115867513A CN115867513A CN202180051093.9A CN202180051093A CN115867513A CN 115867513 A CN115867513 A CN 115867513A CN 202180051093 A CN202180051093 A CN 202180051093A CN 115867513 A CN115867513 A CN 115867513A
- Authority
- CN
- China
- Prior art keywords
- alkali metal
- metal hydroxide
- temperature
- particles
- granulating
- 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
- 150000008044 alkali metal hydroxides Chemical class 0.000 title claims abstract description 58
- 239000002245 particle Substances 0.000 title claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 10
- 238000005469 granulation Methods 0.000 claims description 9
- 230000003179 granulation Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 abstract description 7
- 239000007787 solid Substances 0.000 description 12
- 235000011121 sodium hydroxide Nutrition 0.000 description 10
- 239000008188 pellet Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000005056 compaction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002776 aggregation Effects 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
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000003513 alkali 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
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 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
- 238000002955 isolation Methods 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
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B01J2/22—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
-
- 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
-
- 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
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 a device for granulating alkali metal hydroxide, comprising: -a housing, -a granulating unit with rotating pressing elements and mould plates or mould drums, -a feed line for feeding alkali metal hydroxide into the granulator, -an alkali metal hydroxide granule receiving unit, characterized by a feed of dry air or nitrogen into the housing.
Description
The invention relates to a device for granulating alkali metal hydroxide. The apparatus comprises a housing, a granulating unit with a rotating pressing element and a die plate or die drum, a feed line for feeding alkali metal hydroxide into the granulator, and an alkali metal hydroxide particle receiving unit.
Alkali metal hydroxide flakes, particularly sodium hydroxide flakes, are prepared by immersing the lower portion of a slowly rotating water-cooled metal drum in a bath of molten sodium hydroxide. The melt adheres to the cylinder surface and solidifies outside the bath. The solid alkali metal hydroxide coating is stripped with a knife to form flakes before the metal cylinder is again immersed in the bath.
The flakes have the disadvantage of being easily broken and forming dust when moving. Upon storage, for example in silos, they tend to aggregate and form dense masses.
Other forms of solid alkali metal hydroxide are particles formed from droplets of molten alkali metal hydroxide, which solidify in a stream of cold air. This technique requires large towers and large amounts of cooling air, as well as high investment in equipment.
The mechanically more convenient form of storage and handling of alkali metal hydroxides, especially sodium hydroxide, is in the form of cylindrical particles.
Granulation on an industrial scale is known from other technical fields, in particular from the production of animal feed pellets. It is desirable to have a granulator that is designed to form particles of alkali metal hydroxide. Such granulators should take into account the specific properties and requirements of the alkali metal hydroxide and their handling details.
First, solid alkali metal hydroxides are extremely hygroscopic. They absorb water from the atmosphere on each contact, resulting in the formation of a brine film on the surface, which enhances aggregation and compaction. In more humid conditions, solid alkali metal hydroxides rapidly form liquid alkali.
Secondly, the alkali metal hydroxides in solid form are brittle, which prevents them from deforming under pressure. In contrast, the alkali metal hydroxide flakes are broken. In conventional granulators, solid alkali metal hydroxide flakes will quickly convert to dust rather than become pelletized.
Finally, alkali metal hydroxides are highly reactive. Caustic soda reacts with glass, aluminum, iron, to name a few. Care should be taken to select a resistant material for storing and handling the alkali metal hydroxide. Suitable materials are, for example, stainless steel grades and polyalkylene.
It has now been found that the alkali metal hydroxide can be easily granulated when heated to the plasticizing temperature, which is a temperature much lower than the melting temperature. For sodium hydroxide, the plasticizing temperature is in the range of 63 ℃ to 95 ℃, where solid sodium hydroxide becomes ductile. This temperature range will allow granulation of sodium hydroxide in conventional granulation machines used in the food industry. The plasticizing temperature of potassium hydroxide is in the same range.
Of course, the hygroscopicity of alkali metal hydroxides must be taken into account. This requires isolation of the granulator from moist air.
The invention therefore provides an apparatus for granulating alkali metal hydroxide, comprising a housing, a granulation unit with a rotating pressing element and a die plate or die drum, a feed line for feeding alkali metal hydroxide into a granulator, and an alkali metal hydroxide granule receiving unit, and a feed of nitrogen or dry air into the housing.
In particular, such a device is made of stainless steel.
The granulation unit is more or less conventional, wherein the alkali metal hydroxide to be granulated is fed in solid form and is pressed by a rotating element through a die in a die plate or a die drum. However, in order to take into account the hygroscopicity of alkali metal hydroxides, a feed of shell and drying air is required, wherein the humidity is reduced to a level insufficient for the formation of brine. The relative humidity of the drying air should be at most 30%, preferably 20% or less, corresponding to a dew point of the air at room temperature of 4 ℃ to 8 ℃.
The high temperature necessary for the alkali metal hydroxide to become ductile is usually provided by process heat, which is generated by friction in the granulator. However, in the initial stage, at low rotation speeds and with the formation of large-diameter particles, this heat will not be sufficient to provide the necessary temperature, for example greater than 63 ℃ for sodium hydroxide. Therefore, it is preferred and sometimes desirable to provide a heating unit to heat the alkali metal hydroxide feed and/or the granulation unit.
The alkali metal hydroxide feed can consist of all alkali metal hydroxides in solid form, for example flakes, dusts or pellets. The granulation process can be integrated into any process for the production of solid alkali metal hydroxide and utilize residues from other production forms, such as flakes and pellets.
In a process for producing alkali metal hydroxide granules, solid alkali metal hydroxide is fed into a commercial granulator disposed in a housing having a dry air feed wherein a rotating compaction member pushes the pressware through the holes of a die plate or die drum. The continuously extruded alkali metal hydroxide cylinder exiting the die is periodically cut off with a mechanical device, such as a knife, to limit the length of the cylindrical particles as desired. Typically, the particles will be in the range of 1mm to 8mm in diameter and between 0.5 and 2.0 times the diameter in length.
The raw particles leave the pellet press by gravity and are sized in a sizing unit comprising one or more sieves. The undersize portion is returned to the feed line and the portion of the correct size is collected in a container or bag for further processing or storage. In the classifying unit, the temperature of the primary particles should be below the plasticizing temperature, preferably below 55 ℃, to avoid further deformation.
Thus, it may be necessary to cool the particles after shaping, for example in a cold stream of dry air.
Alkali metal hydroxide particles, especially sodium hydroxide particles, have good pressure resistance and can be stored in silos without compaction or agglomeration. The particles can be transported and handled without the formation of dust. This allows for various transportation, silo storage and packaging.
The invention also relates to a process in which the solid alkali metal hydroxide in any form and from any production process is heated or cooled to a plasticizing temperature, in particular between 63 ℃ and 95 ℃, fed into a granulator and granulated in an atmosphere of dry nitrogen or dry air. The feed and/or pellet press may be heated to a plasticizing temperature. The granules formed in the granulator are sieved over a sieve, preferably having a mesh size slightly smaller than the desired granule diameter, to separate the undersized material. To avoid further deformation of the granules, the granules are cooled below the plasticizing temperature, preferably below 55 ℃ for sodium hydroxide.
Claims (18)
1. An apparatus for granulating alkali metal hydroxide comprising
-a housing for the housing,
a granulating unit with a rotating pressing element and a mould plate or mould drum,
a feed line for feeding alkali metal hydroxide into the granulator,
-an alkali metal hydroxide particle receiving unit,
characterized by a feed of dry air or nitrogen into the shell.
2. The device of claim 1, wherein the alkali metal hydroxide is sodium hydroxide.
3. The device according to claim 1, comprising an air dryer designed to provide dry air with a relative humidity of at most 30%.
4. The apparatus of claim 1, wherein the drying air has a dew point of 4 ℃ to 8 ℃, the drying air having a room temperature.
5. The apparatus of claim 1, further comprising a classification system for separating the alkali metal hydroxide particles into undersize material and material having a desired size.
6. The apparatus of claim 1, further comprising a cooling unit for cooling the alkali metal hydroxide particles below a plasticizing temperature.
7. The apparatus of claim 1, further comprising a heating unit designed to provide a temperature at which the alkali metal hydroxide to be granulated becomes ductile.
8. The apparatus of claim 7, wherein the heating unit provides heat to the alkali metal hydroxide feed.
9. The apparatus of claim 7 or 8, wherein the heating unit provides heat to the granulation unit.
10. The apparatus of claim 7, wherein the alkali metal hydroxide is sodium hydroxide and the temperature is in a range of 63 ℃ to 95 ℃.
11. The apparatus of claim 5, wherein the undersize material is recycled to the granulation unit.
12. The apparatus of claim 1, wherein the dies of the die plate or die drum are designed to provide particles having a diameter in the range of 1mm to 8 mm.
13. The apparatus of claim 12, further comprising a knife for periodically severing the extruded alkali metal hydroxide particles.
14. The device according to claim 13, wherein the alkali metal hydroxide particles are cut to a length of 0.5 to 2.0 times the diameter.
15. A process for granulating an alkali metal hydroxide comprising the steps of:
providing the alkali metal hydroxide at a temperature at which the alkali metal hydroxide is malleable,
feeding the alkali metal hydroxide in malleable form to a granulator,
granulating the alkali metal hydroxide under an atmosphere of dry nitrogen or dry air,
classifying and collecting the granulated alkali metal hydroxide.
16. The process of claim 15, carried out in dry air having a relative humidity of less than 30%.
17. The method of claim 15, wherein the pelletized alkali metal hydroxide is cooled to a temperature below the plasticizing temperature prior to classification.
18. The method of claim 15, wherein the temperature of the alkali metal hydroxide is 63 ℃ to 95 ℃.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010849034.3A CN114073915A (en) | 2020-08-21 | 2020-08-21 | Device for producing alkali metal hydroxide particles |
| CN2020108490343 | 2020-08-21 | ||
| PCT/EP2021/072737 WO2022038092A1 (en) | 2020-08-21 | 2021-08-16 | Apparatus for producing alkali hydroxide pellets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115867513A true CN115867513A (en) | 2023-03-28 |
Family
ID=77693478
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010849034.3A Pending CN114073915A (en) | 2020-08-21 | 2020-08-21 | Device for producing alkali metal hydroxide particles |
| CN202180051093.9A Pending CN115867513A (en) | 2020-08-21 | 2021-08-16 | Device for producing alkali metal hydroxide particles |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010849034.3A Pending CN114073915A (en) | 2020-08-21 | 2020-08-21 | Device for producing alkali metal hydroxide particles |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4200067A1 (en) |
| CN (2) | CN114073915A (en) |
| WO (1) | WO2022038092A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB937447A (en) * | 1960-08-15 | 1963-09-18 | Ici Australia Ltd | Improvements in and relating to the pelleting of prillable chemical materials |
| GB1107144A (en) * | 1966-02-12 | 1968-03-20 | Dynamit Nobel Ag | Improvements in the manufacture of moulded bodies |
| GB1264648A (en) * | 1968-09-05 | 1972-02-23 | ||
| CN2037735U (en) * | 1988-02-05 | 1989-05-17 | 杭州龙山化工厂 | Granulator for ammonium-chloride monomer |
| CN1491931A (en) * | 2003-08-28 | 2004-04-28 | 付炳忠 | Process for preparing granular patassium formate and its pelletizing equipment |
| CN101198400A (en) * | 2005-06-15 | 2008-06-11 | Snpe巨能材料公司 | Dry process manufacture of pyrotechnical objects, resulting pyrotechnical objects |
| CN104884154A (en) * | 2012-10-25 | 2015-09-02 | 博特化工装置股份公司 | Method for granulating meltable materials |
Family Cites Families (15)
| 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 | |
| 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 | ||
| 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 |
| 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 |
| 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 |
| 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
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB937447A (en) * | 1960-08-15 | 1963-09-18 | Ici Australia Ltd | Improvements in and relating to the pelleting of prillable chemical materials |
| GB1107144A (en) * | 1966-02-12 | 1968-03-20 | Dynamit Nobel Ag | Improvements in the manufacture of moulded bodies |
| GB1264648A (en) * | 1968-09-05 | 1972-02-23 | ||
| CN2037735U (en) * | 1988-02-05 | 1989-05-17 | 杭州龙山化工厂 | Granulator for ammonium-chloride monomer |
| CN1491931A (en) * | 2003-08-28 | 2004-04-28 | 付炳忠 | Process for preparing granular patassium formate and its pelletizing equipment |
| CN101198400A (en) * | 2005-06-15 | 2008-06-11 | Snpe巨能材料公司 | Dry process manufacture of pyrotechnical objects, resulting pyrotechnical objects |
| CN104884154A (en) * | 2012-10-25 | 2015-09-02 | 博特化工装置股份公司 | Method for granulating meltable materials |
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|---|
| 张长在等: "粒碱生产装置小结", 中国氯碱, no. 12, 25 December 2005 (2005-12-25), pages 26 - 27 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4200067A1 (en) | 2023-06-28 |
| CN114073915A (en) | 2022-02-22 |
| WO2022038092A1 (en) | 2022-02-24 |
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