IL32680A - Process for extracting calcium hydroxide from admixtures with other substances - Google Patents
Process for extracting calcium hydroxide from admixtures with other substancesInfo
- Publication number
- IL32680A IL32680A IL32680A IL3268069A IL32680A IL 32680 A IL32680 A IL 32680A IL 32680 A IL32680 A IL 32680A IL 3268069 A IL3268069 A IL 3268069A IL 32680 A IL32680 A IL 32680A
- Authority
- IL
- Israel
- Prior art keywords
- calcium
- extraction
- hydroxide
- calcium chloride
- calcium hydroxide
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 22
- 239000000920 calcium hydroxide Substances 0.000 title claims description 21
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 title claims description 20
- 229910001861 calcium hydroxide Inorganic materials 0.000 title claims description 20
- 239000000126 substance Substances 0.000 title description 4
- 238000000605 extraction Methods 0.000 claims description 19
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 15
- 239000001110 calcium chloride Substances 0.000 claims description 12
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 9
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 8
- 239000000347 magnesium hydroxide Substances 0.000 claims description 8
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000002367 phosphate rock Substances 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims description 3
- 239000001506 calcium phosphate Substances 0.000 claims 2
- 150000002440 hydroxy compounds Chemical class 0.000 claims 2
- 235000019739 Dicalciumphosphate Nutrition 0.000 claims 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 1
- 229910000389 calcium phosphate Inorganic materials 0.000 claims 1
- 235000011010 calcium phosphates Nutrition 0.000 claims 1
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 claims 1
- 229910000390 dicalcium phosphate Inorganic materials 0.000 claims 1
- 229940038472 dicalcium phosphate Drugs 0.000 claims 1
- -1 phenol Chemical class 0.000 claims 1
- 239000000376 reactant Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 claims 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 16
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 12
- 229910052791 calcium Inorganic materials 0.000 description 12
- 239000011575 calcium Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- UCUJUFDOQOJLBE-UHFFFAOYSA-N [Cl].[Ca] Chemical compound [Cl].[Ca] UCUJUFDOQOJLBE-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- HXLOWTJVPDEZQG-UHFFFAOYSA-L calcium phenol dichloride Chemical compound [Cl-].[Ca+2].C1(=CC=CC=C1)O.[Cl-] HXLOWTJVPDEZQG-UHFFFAOYSA-L 0.000 description 1
- ZMRQTIAUOLVKOX-UHFFFAOYSA-L calcium;diphenoxide Chemical compound [Ca+2].[O-]C1=CC=CC=C1.[O-]C1=CC=CC=C1 ZMRQTIAUOLVKOX-UHFFFAOYSA-L 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000010414 supernatant solution Substances 0.000 description 1
Classifications
-
- 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
- C01F11/16—Purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
PROCESS FOR EXTRACTING CALCIUM HYDROXIDE FROM ADMIXTURES WITH OTHER SUBSTANCES The present invention relates to a novel process for the extraction of calcium hydroxide from heavily and similar and for the conversion of the into comparatively pure and useful products of More this novel process relates to a process making it possible to utilize limestone deposits heavily contaminated with to convert the heavily contaminated lime into relatively pure utilizing comparatively small quantities of liquid and Comparatively resulting in substantial savings of water and substantially reduced rates as compared with conventional processes the production of such products from impure According to the present the calcium source as calcined dolomite or the is and extracted preferably in number o wit an aqueous solution containing appreciable amounts of calcium the resulting aqueous solution containing the dissolved calcium hydroxide is part of the calcium ion contained therein is converted into the desired and residual calcium chloride is returned in order to effect a further stage of the extraction of the starting the extractions being repeated several times until substantially the entire quantity of calcium hydroxide contained therein is It is well known that calcined lime is a very useful There exist abundant deposits of but the usual natural material is generally impure and the impurities often make it difficult even uneconomical to utilise natural limestone sources when a pure product is The solubility of milk of lime in water is rather and therefore the purification by extraction of the material with water requires quite substantial quantities of water and energy for pumping and for other steps of the These drawbacks are overcome by the present and it is made possible utilize natural deposits and other severely contaminated sources of calcium in order to recover the the form of quite pure products in an economical In the process according to the present invention there is utilized the increased solubility of calcium hydroxide in aqueous solutions of calcium as compared with the solubility of calcium hydroxide of in pure This increased solubility is contrary to what might be expected from the common ion Whereas calcium hydroxide has only a solubility of about 1 gr per liter in water at ambient its solubility in aqueous solutions of calcium chloride increases with an increased content of calcium and reaches a maximum of about 5 gr calcium hydroxide per liter of aqueous solution containing 450 gr calcium chloride per According to the calcium hydroxide is extracted from sources containing same in admixture with other substances by means of an aqueous containing from about 100 to 450 calcium Generally only a fraction of the calcium hydroxide content of the source is extracted at each solution of lime in the calcium chloride isseparated and reacted with a suitable compound to which obtain the desired product most cases ia insoluble in the chloride is separated from this solution can be for further extraction As compared with water as extraction there are obtained substantially reduced flow less voluminous equipment and a substantially decreased power consumption for The process to the present invention is of special value for the production of products as hydroxide and high grade as will be set out in detail According to yet another feature of the present there may be used as extraction medium chloride in combination with a compound or a mixture of compounds which weakly bind calcium and wliich substantially increase the solubility of calcium such compounds there may be mentioned such as phenol and the The soluble o compounds are subsequently decomposed during the production of the desired compound and may thus be to be used in further stages of the The invention will be illustrated by waybof example only with reference to the following which are to be construed in a limitative 1 Calcined phosphate rock containing about 40 by weight calcium the rest being was ground to mesh and slaked in 100 gr of the thus was introduced into 4 liters of 200 calcium chloride stirred vigorously for 15 allowed to settle during minutes and after this 2 of the supernatant solution was drawn A quantity of gr calcium To this 33 of 170 magnesium chloride solution was Λ fine precipitate magnesium hydroxide was for 1 minutes and allowed to The precipitate was washed and The solution was returned for further cycle of After the tenth such cycle the calcium hydroxide content of the starting material was and the first was found to contain about 60 gr of consisting mainly of enriched with very little free The combined magnesium hydroxide precipitates weighed 35 gr and consisted of magnesium hydroxide of a purity better than 95 per Both products are materials of commercial The calcium chloride solution can be used for extracting further batches of Example Dolomite gravel containing about 5 per cent by weight alumina and iron oxide was crushed to 1 3 calcined at and 100 gr of the calcined product were introduced into a beaker taining aqueous calcium chloride solution of 200 After stirring for 1 minutes and settling during 30 2 were drawn off and these contained 2 gr calcium hydroxide per This tion was reacted with magnesium chloride as in Example similar j After effecting repeatedly the extraction the leaching was stopped when nearly all the calcium hydroxide had been In one beaker a residue of magnesium hydroxide with all the impurities remained in the other a total of of a purity better than was Example An extraction was carried out as in Example with identical After each extraction the solution of calcium hydroxide in calcium chloride was reacted with a clear solution obtained by dissolving phosphate rock in hydrochloric acid in and producing a precipitate of about In the residue after the dissolution of the phosphate rock in HCl there remained the organic The extraction step was repeated until the lime value of the starting material was A nearly quantitative yield of was the calcium chloride can be used Example The process of 1 but the extraction medium in addition the calcium also 20 of The solubilit of calcium hydroxide 8 of this and thus only three extraction steps were The extract containing the calcium phenolate reacts magnesium and at the the phenol is set free and the calcium chloride phenol mixture can be used again for further extraction The process according to the present invention be carried out by conventional means as used in the chemical It can be efected with a pair devices used for reacting solidliquid systems and for separating the solid there may be used a pair of thickeners or any other device where instead of the thickener there is used another device for the separation of solids from such as centrifuges or the the extract is reacted with a compound resulting in the production of the desired product and in the production of calcium chloride 6 circulated between the two devices and only an excess of the calcium chlor de solution wi be When such a pair of 1s in the first one there remains a residue of the unreacted solids and after substantial completion of the extraction of the calcium this generally comprises one of the vendible products such as enriched whereas In the second device there 1s obtained the other desi red such as substantially pure magnesium hydroxide or substantially pure Between the two devices 1s circulated a solution and 1n most cases this can be used there being necessary only adjustments of It 1s clear that certain additional agents such as lants can be as are well known in the It Is clear that the above Is by way of example only and that many variations can be resorted to without departing from the scope of the insufficientOCRQuality
Claims (12)
1. A process for the recovery of calcium hydroxide from sources containing this compound In admixture with substantial quantities of other water-insoluble compounds 9 which comprises extracting the calcium hydroxide by means of an aqueous solution of calcium chloride containing from 100 g to 450 g calcium chloride per li ter.
2. A process as claimed in Claim 1 , wherein the extraction 1s effected In a plurality of steps unti l the source 1s substantially exhausted.
3. A process as claimed in Claim 1 or 2, where the source 1s calcined phosphate rock, of high lime content.
4. A process as claimed in Claim 1 or 2, where the source 1s Cal ci ned dolomite gravel .
5. A process as claimed in any of claims to 4, where the extract s reacted with aqueous magnesium chloride, to produce magnesium hydroxide.
6. A process as claimed in any of claims 1 to 4, where the extract 1s reacted with a solution obtained by dissolving phosphate rock in hydrochloric acid, resulting th the production of d1 calcium phosphate.
7. A process as claimed in claims 5 or 6, where the calcium chloride formed in the reaction Is utilized for extracting further batches of the starting material or for a further step of extraction. - 8 - 32680/3
8. A process as claimed 1n any of claims 1 to 6, wherein a water-soluble organic hydroxy-compound, such as phenol , sugar, alcohol or the like, 1s added to the calcium chloride solution used for the extraction, so as to Increase the solubility of the calcium hydroxide in the extracting medium.
9. A process as claimed 1n claim 8, where the hydroxy compound 1s recovered together with the calcium chloride after the reaction of the extract with the other reactant, and its concentration Is adjusted so as to make suitable for further extraction steps .
10. A process for extracting calcium hydroxide from sources containing this compound together with other water-Insoluble compounds , substantial ly as hereinbefore described and with reference to any of the examples.
11. A process for the production of magnesium hydroxide and for the production of DCP respectively, substantially as hereinbefore described and with reference to any of the examples.
12. Magnesium hydroxide, enriched phosphate rock, and dicalcium phosphate, whenever obtained in a process as claimed in any of claims 3 through 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL32680A IL32680A (en) | 1969-07-22 | 1969-07-22 | Process for extracting calcium hydroxide from admixtures with other substances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL32680A IL32680A (en) | 1969-07-22 | 1969-07-22 | Process for extracting calcium hydroxide from admixtures with other substances |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IL32680A0 IL32680A0 (en) | 1969-09-25 |
| IL32680A true IL32680A (en) | 1973-11-28 |
Family
ID=11045043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL32680A IL32680A (en) | 1969-07-22 | 1969-07-22 | Process for extracting calcium hydroxide from admixtures with other substances |
Country Status (1)
| Country | Link |
|---|---|
| IL (1) | IL32680A (en) |
-
1969
- 1969-07-22 IL IL32680A patent/IL32680A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IL32680A0 (en) | 1969-09-25 |
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