IL40909A - Process for making magnesia - Google Patents
Process for making magnesiaInfo
- Publication number
- IL40909A IL40909A IL40909A IL4090972A IL40909A IL 40909 A IL40909 A IL 40909A IL 40909 A IL40909 A IL 40909A IL 4090972 A IL4090972 A IL 4090972A IL 40909 A IL40909 A IL 40909A
- Authority
- IL
- Israel
- Prior art keywords
- cake
- magnesium hydroxide
- sludge
- pressure
- compacting
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims 34
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims 16
- 239000000395 magnesium oxide Substances 0.000 title claims 9
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims 14
- 239000000347 magnesium hydroxide Substances 0.000 claims 14
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims 14
- 239000010802 sludge Substances 0.000 claims 10
- 238000010438 heat treatment Methods 0.000 claims 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical group [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 4
- 239000000463 material Substances 0.000 claims 3
- 239000007787 solid Substances 0.000 claims 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims 2
- 239000003518 caustics Substances 0.000 claims 2
- 150000001875 compounds Chemical class 0.000 claims 2
- 239000004744 fabric Substances 0.000 claims 2
- 239000012065 filter cake Substances 0.000 claims 2
- 238000001914 filtration Methods 0.000 claims 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 2
- 238000003825 pressing Methods 0.000 claims 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims 1
- 235000011941 Tilia x europaea Nutrition 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 239000003513 alkali Substances 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 239000011449 brick Substances 0.000 claims 1
- 238000001354 calcination Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 235000013312 flour Nutrition 0.000 claims 1
- 239000008187 granular material Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 1
- 239000004571 lime Substances 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 229910001629 magnesium chloride Inorganic materials 0.000 claims 1
- 229910001425 magnesium ion Inorganic materials 0.000 claims 1
- 239000011707 mineral Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000005453 pelletization Methods 0.000 claims 1
- 239000002244 precipitate Substances 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 239000002243 precursor Substances 0.000 claims 1
- 239000013535 sea water Substances 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 239000004094 surface-active agent Substances 0.000 claims 1
- 238000005979 thermal decomposition reaction Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 229910052845 zircon Inorganic materials 0.000 claims 1
- 150000003754 zirconium Chemical class 0.000 claims 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims 1
Classifications
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/42—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on chromites
-
- 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
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
- C01F5/06—Magnesia by thermal decomposition of magnesium compounds
- C01F5/08—Magnesia by thermal decomposition of magnesium compounds by calcining magnesium hydroxide
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/12—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on chromium oxide
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/44—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Treatment Of Sludge (AREA)
Claims (13)
1. CLAIMS, 1. A process for making magnesia wherein a sludge of magnesium hydroxide is simultaneously dewatered and compacted to give a cake of magnesium hydroxide containing at least 67.5% by weight of solids and having a green bulk density of at least 1.15 grams/cc and wherein the cake thereby obtained is converted by a suitable heat treatment into magnesium oxide.
2. A process as "claimed in claim 1 wherein the sludge of magnesium hydroxide contains from 150 grammes to JJOO grammes of magnesium hydroxide per litre.
3. A process as claimed in claim 1 or claim 2 wherein the. cake of magnesium hydroxide has a green bulk density greater than 1.20 grams/cc.
4. A process .as claimed in any one of the preceding claims wherein the magnesium hydroxide has been obtained by, (i) treating a solution containing magnesium ions, for example, brines, sea water and the like, with alkali and separating the precipitate of magnesium hydroxide, for example, by settling; (ii) treating minerals containing magnesium with acid, such as hydrochloric acid, and precipitating magnesium hydroxide from the solution which results from such treatment; or · (iii) thermal decomposition of■ magnesium chloride to magnesium oxide and subsequent conversion of the oxide to the hydroxide.
5. process as claimed in any one of the preceding claims wherein the operation- of simultaneously dewatering and compacting the magnesium hydroxide sludge involves the application of pressures greater than 00 pounds per square inch.
6. A process as' claimed in claim 5 wherein the pressure is in the range from 400 to 10,000 pounds per square inch. ' »
7. A process as claimed in claim 6 wherein the pressure is in the range from 750 to 7,500 pounds per. square inch.
8. A process as claimed in any one of the preceding claims wherein dewatering and compacting are effected by feeding the magnesium hydroxide sludge to a filter and applying pressure thereto.
9. · A process as claimed in claim 8 wherein the filter comprises a cylindrical filter cloth around a hollow cylindrical supporting perforated core, pressure being applied hydraulically to the material being filtered usually via a flexible sleeve which surrounds it.
10. . A process as claimed in claim 8 or claim 9 wherein the filtration is effected in two stages, a first stage at relatively low pressure and second stage at relatively high pressure.
11. . A process as- claimed in -claim 10 wherein the. first stage of the filtration is effected at a pressure of from ^tOO to 1000 psi and the second stage is effected at a pressure greater than 1000 psi, after' addition of a further quantity of sludge to the filter cake obtained in the first stage.
12. . A process as claimed in any one of claims 1 to 7 wherein dewatering and compacting are effected by feeding the sludge to a perforated mould lined with a filter cloth and applying pressure to the sludge via a piston adapted to slide within the mould.
13. . A process as claimed in any one of the preceding claims wherein dewatering and compacting are carried out at a temperature above ambient. Ik. A process as claimed in any one of claims 1 to 12 wherein dewatering and compacting are- carried out at a temperature in the range 25°C to 100°C. 15 · A process as claimed in any one of the preceding claims wherein the sludge incorporates a surface active agent. if 1β . A process as. claimed in any one of the preceding claims wherein the heat treatment comprises calcining the magnesium hydroxide cake to a maximum temperature of about 1200°C to yield ah active or caustic magnesia. 17. A process as claimed in claim 16 wherein the cake is calcined to a temperature of about 1000°C. 18. A process as claimed in any one of claims 1 to 15 wherein the heat treatment comprises dead burning the magnesium hydroxide cake by heating to a temperature above l600°C. 19. A process as claimed in claim 18 wherein the cake is dead burnt by heating to a temperature · up to 2000°C. 20. A process as claimed in claim 18 or claim 19 wherein dead burning is carried out in a rotary kiln. 21. A process as claimed in any one of claims 18 to 20 wherein the cake is pelletized prior to dead burning. 22. A process as claimed in claim 21 wherein the cake to be pelletized has been dewatered and compacted to a solids content of at least by weight . 23. A process as claimed in claim 22 wherein the cake has been dewatered and compacted to a solids content of from 80 to 95$ by weight. 24. A process as claimed in claim 22 or claim 23 wherein dewatering and compacting have been carried out at a pressure greater than 2,000 pounds per square inch . 25.. A process as claimed in claim 22 or claim 23 wherein dewatering and compacting have been carried out at a pressure between 400 and 2000 pounds per square inch and the cake has subsequently been partially dried. 26. A process as claimed in claim 25 wherein partial drying is effected to a water content of from 5 to 20$ by weight. 27.. A process as claimed in any one of claims 21 to 26 wherein the cake is broken down into granules before pelletization . 28. A process as claimed in any one of the preceding claims wherein there is mixed with the sludge of magnesium hydroxide a finely divided refractory compound or a precursor therefor. 29. A process as claimed in claim 28 wherein the refractory compound is selected from lime-bearing materials, chrome-bearing materials, zircon, zirconia and zirconium salts, silica, iron oxide (Fe^ O^) and alumina . 30. A process as. claimed in claim 28 wherein finely divided chrome ore, known as chrome flour, is mixed with the sludge of magnesium hydroxide and chrome ore of comparatively large particle size is mixed with the filter cake. 31. A process for making magnesia as claimed in claim 1 and substantially as hereinbefore described in any one of Examples 1 to 7· 32. Caustic magnesia whenever produced by the process as claimed in claim 16 or claim 17. 33. Dead burned magnesia whenever produced by the process as claimed in any one of claims 1 to 15 and 18 to 31. 3k . Refractory aggregates and refractory shapes, fo example, bricks and blocks, when made from dead burned magnesia as claimed in claim 33. 35· A furnace wall or lining whenever constructed wholly or partly from refractory shapes as claimed in claim >k .
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5582071 | 1971-12-01 | ||
| GB1548272*[A GB1407199A (en) | 1971-12-01 | 1972-04-04 | Process for making magnesia |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IL40909A0 IL40909A0 (en) | 1973-01-30 |
| IL40909A true IL40909A (en) | 1976-01-30 |
Family
ID=26251324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL40909A IL40909A (en) | 1971-12-01 | 1972-11-23 | Process for making magnesia |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS5318000B2 (en) |
| AT (1) | AT342486B (en) |
| BG (1) | BG25661A3 (en) |
| CA (1) | CA973685A (en) |
| ES (1) | ES409157A1 (en) |
| FI (1) | FI57392C (en) |
| FR (1) | FR2162117B1 (en) |
| GB (1) | GB1407199A (en) |
| IE (1) | IE37428B1 (en) |
| IL (1) | IL40909A (en) |
| IT (1) | IT975906B (en) |
| NL (1) | NL7216384A (en) |
| NO (1) | NO133491C (en) |
| RO (1) | RO62603A (en) |
| YU (2) | YU298172A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5919275U (en) * | 1982-07-27 | 1984-02-06 | ヨコタ工業株式会社 | C type ring clincher |
-
1972
- 1972-04-04 GB GB1548272*[A patent/GB1407199A/en not_active Expired
- 1972-11-21 IE IE1610/72A patent/IE37428B1/en unknown
- 1972-11-21 CA CA157,069A patent/CA973685A/en not_active Expired
- 1972-11-23 IL IL40909A patent/IL40909A/en unknown
- 1972-11-30 BG BG022004A patent/BG25661A3/en unknown
- 1972-11-30 AT AT1021372A patent/AT342486B/en not_active IP Right Cessation
- 1972-11-30 FR FR7242641A patent/FR2162117B1/fr not_active Expired
- 1972-11-30 NO NO4403/72A patent/NO133491C/no unknown
- 1972-11-30 RO RO7200072994A patent/RO62603A/en unknown
- 1972-11-30 IT IT70773/72A patent/IT975906B/en active
- 1972-11-30 JP JP12029672A patent/JPS5318000B2/ja not_active Expired
- 1972-11-30 ES ES409157A patent/ES409157A1/en not_active Expired
- 1972-11-30 FI FI3400/72A patent/FI57392C/en active
- 1972-12-01 NL NL7216384A patent/NL7216384A/xx not_active Application Discontinuation
- 1972-12-01 YU YU02981/72A patent/YU298172A/en unknown
-
1973
- 1973-12-01 YU YU02981/73A patent/YU39016B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB1407199A (en) | 1975-09-24 |
| IT975906B (en) | 1974-08-10 |
| JPS5318000B2 (en) | 1978-06-12 |
| CA973685A (en) | 1975-09-02 |
| YU39016B (en) | 1984-02-29 |
| FI57392C (en) | 1980-08-11 |
| NO133491C (en) | 1976-05-12 |
| BG25661A3 (en) | 1978-11-10 |
| AT342486B (en) | 1978-04-10 |
| FR2162117B1 (en) | 1976-06-04 |
| JPS4865197A (en) | 1973-09-08 |
| NL7216384A (en) | 1973-06-05 |
| NO133491B (en) | 1976-02-02 |
| IE37428B1 (en) | 1977-07-20 |
| FI57392B (en) | 1980-04-30 |
| ATA1021372A (en) | 1977-07-15 |
| IL40909A0 (en) | 1973-01-30 |
| ES409157A1 (en) | 1975-11-16 |
| YU298172A (en) | 1982-02-28 |
| RO62603A (en) | 1978-05-15 |
| IE37428L (en) | 1973-06-01 |
| FR2162117A1 (en) | 1973-07-13 |
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