CN109777973B - Method and device for selectively leaching scandium from lateritic nickel ore smelting slag - Google Patents
Method and device for selectively leaching scandium from lateritic nickel ore smelting slag Download PDFInfo
- Publication number
- CN109777973B CN109777973B CN201910214704.1A CN201910214704A CN109777973B CN 109777973 B CN109777973 B CN 109777973B CN 201910214704 A CN201910214704 A CN 201910214704A CN 109777973 B CN109777973 B CN 109777973B
- Authority
- CN
- China
- Prior art keywords
- agent
- roasting
- mineral
- temperature
- phase
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 151
- 238000002386 leaching Methods 0.000 title claims abstract description 115
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 239000002893 slag Substances 0.000 title claims abstract description 85
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 84
- 238000003723 Smelting Methods 0.000 title claims abstract description 79
- 229910052706 scandium Inorganic materials 0.000 title claims abstract description 68
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 123
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 122
- 239000011707 mineral Substances 0.000 claims abstract description 122
- 230000008569 process Effects 0.000 claims abstract description 111
- 239000002253 acid Substances 0.000 claims abstract description 90
- 150000003839 salts Chemical class 0.000 claims abstract description 79
- 238000005406 washing Methods 0.000 claims abstract description 44
- 238000002156 mixing Methods 0.000 claims abstract description 27
- 239000000243 solution Substances 0.000 claims abstract description 14
- 239000007864 aqueous solution Substances 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 89
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 21
- 238000001354 calcination Methods 0.000 claims description 17
- 239000003599 detergent Substances 0.000 claims description 16
- 238000011084 recovery Methods 0.000 claims description 11
- 229910052783 alkali metal Inorganic materials 0.000 claims description 10
- 150000001340 alkali metals Chemical class 0.000 claims description 10
- 150000003863 ammonium salts Chemical class 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 229910001710 laterite Inorganic materials 0.000 claims description 9
- 239000011504 laterite Substances 0.000 claims description 9
- 238000010304 firing Methods 0.000 claims description 8
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 238000000197 pyrolysis Methods 0.000 abstract description 18
- 239000012071 phase Substances 0.000 description 115
- 229910052761 rare earth metal Inorganic materials 0.000 description 15
- 230000009286 beneficial effect Effects 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 229910052710 silicon Inorganic materials 0.000 description 12
- 239000010703 silicon Substances 0.000 description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 239000012535 impurity Substances 0.000 description 10
- 150000002910 rare earth metals Chemical class 0.000 description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 229910001413 alkali metal ion Inorganic materials 0.000 description 4
- -1 scandium ions Chemical class 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 150000003325 scandium Chemical class 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 229910017709 Ni Co Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- QHYMYKHVGWATOS-UHFFFAOYSA-H scandium(3+);trisulfate Chemical class [Sc+3].[Sc+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O QHYMYKHVGWATOS-UHFFFAOYSA-H 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- Manufacture And Refinement Of Metals (AREA)
Abstract
The application provides a method and a device for selectively leaching scandium from lateritic nickel ore smelting slag. The method comprises the following steps: mixing laterite-nickel ore smelting slag with an aqueous solution of a first ore phase reconstruction agent to obtain a reconstructed mineral acid salt, wherein the first ore phase reconstruction agent comprises acid; roasting the reconstructed mineral acid salt at the medium temperature to obtain a medium temperature roasting product, wherein the temperature of the medium temperature roasting process is 500-800 ℃; and washing the intermediate-temperature roasting product to obtain a leaching solution containing scandium. According to the treatment method, the pyrolysis process of scandium in the middle-temperature roasting process can be restrained through the ore phase reconstruction process, and the purpose of selectively leaching scandium from lateritic nickel ore smelting slag can be achieved.
Description
Technical Field
The application relates to the field of rare earth element recovery, in particular to a method and a device for selectively leaching scandium from lateritic nickel ore smelting slag.
Background
The related application patent for recovering valuable elements in laterite-nickel ore smelting slag is few. In the prior art, scandium is mainly extracted by a direct mineral acid leaching method, and the method is generally not strong enough in selective leaching of target elements. The acid-soluble elements in laterite-nickel ore smelting slag are more or less soluble in the leachate, wherein silicon element can cause great difficulty in solid-liquid separation. In the subsequent links of extraction, washing, back extraction, purification and the like, impurity elements such as silicon, iron, titanium, chromium and the like can certainly increase scandium extraction and separation difficulty.
The direct mineral acid leaching method has high acid consumption, the acid is not recoverable, and the raffinate and the leached slag also need to be neutralized. In addition, the higher impurity elements in the leaching solution cause high extraction difficulty. Silicon can be extremely difficult to separate from solid and liquid during leaching due to the formation of silicic acid. The existing method has not ideal extraction effect on rare earth elements.
Disclosure of Invention
The application mainly aims to provide a method and a device for selectively leaching scandium from lateritic nickel ore smelting slag, which are used for solving the problem of low leaching rate of rare earth elements when the existing direct acid leaching method is adopted to leach lateritic nickel ore.
In order to achieve the above object, according to the present application, there is provided a method for selectively leaching scandium from lateritic nickel ore smelting slag, the method comprising: mixing laterite-nickel ore smelting slag with an aqueous solution of a first ore phase reconstruction agent to obtain a reconstructed mineral acid salt, wherein the first ore phase reconstruction agent comprises acid; roasting the reconstructed mineral acid salt at the medium temperature to obtain a medium temperature roasting product, wherein the temperature of the medium temperature roasting process is 500-800 ℃; and washing the intermediate-temperature roasting product to obtain a leaching solution containing scandium.
Further, the acid in the first mineral phase reconstituting agent is selected from HCl, HNO 3 And H 2 SO 4 One or more of the following; preferably, the concentration of the acid in the first ore phase reconstruction agent is more than 0.5 times of the analytically pure concentration, and the volume of the first ore phase reconstruction agent required by each gram of laterite-nickel ore smelting slag is 0.2-1.5 mL; more preferably, the concentration of the acid in the first ore phase reconstruction agent is more than 0.5 times of the analytically pure concentration, and the volume of the first ore phase reconstruction agent required for each gram of laterite-nickel ore smelting slag is 0.5-1 mL.
Further, prior to subjecting the reconstituted mineral acid salt to the intermediate temperature calcination process, the method further comprises: carrying out a low-temperature roasting process on the reconstructed mineral salt and a second mineral phase reconstruction agent to obtain a low-temperature roasting product, wherein the temperature of the low-temperature roasting process is 100-500 ℃, and the second mineral phase reconstruction agent comprises alkali metal inorganic salt and/or ammonium salt; performing a medium-temperature roasting process on the low-temperature roasting product to obtain a medium-temperature roasting product; preferably, the alkali metal inorganic salt in the second mineral phase reconstituting agent is selected from Na 2 SO 4 、K 2 SO 4 、NaCl、KCl、NaNO 3 And KNO 3 One or more of the following; preferably, the ammonium salt in the second mineral phase reconstituting agent is (NH 4 ) 2 SO 4 And/or NH 4 HSO 4 。
Further, the weight of the second ore phase reconstruction agent required by each gram of laterite-nickel ore smelting slag is 0.01-1 g; preferably, the weight of the second mineral phase restructuring agent required per gram of laterite-nickel ore smelting slag is 0.1-0.5 g.
Further, the time of the low-temperature roasting process is 1-240 min; preferably, the time of the intermediate temperature roasting process is 10 to 240 minutes.
Further, the medium temperature roasting process is a temperature changing process, preferably the temperature changing rate in the medium temperature roasting process is 2-15 ℃/min.
Further, the medium temperature roasting process is a negative pressure roasting process.
Further, the low-temperature roasting process is a temperature changing process; preferably, the temperature rising rate in the low-temperature roasting process is 5-15 ℃/min.
Further, the washing process includes: under the stirring action, leaching the medium-temperature roasting material and the detergent; preferably, the detergent is acid liquor with pH value of 2.5-3.2, the dosage of the acid liquor corresponding to each gram of medium-temperature roasting material is 2-15 mL, the leaching time is 10-240 min, and the stirring strength is 100-400 rpm.
Further, the temperature of the washing process is 15-90 ℃.
In another aspect of the application there is provided an apparatus for selectively leaching scandium element from lateritic nickel ore smelting slag, the apparatus comprising: the device comprises a mixing unit, a roasting unit and a washing unit, wherein the mixing unit is provided with a laterite-nickel ore smelting slag inlet, a first ore phase reconstruction agent inlet and a reconstructed mineral acid salt outlet, and is used for carrying out first ore phase reconstruction on laterite-nickel ore smelting slag under the action of the first ore phase reconstruction agent to obtain the reconstructed mineral acid salt, wherein the first ore phase reconstruction agent inlet is used for supplying acid as the first ore phase reconstruction agent; the roasting unit is connected with the reconstructed mineral acid salt outlet and is used for roasting the reconstructed mineral acid salt in sequence so as to reconstruct the mineral phase of the reconstructed mineral acid salt at least once; the washing unit is connected with the outlet of the roasting unit and is provided with a detergent inlet for washing the roasting product discharged from the roasting unit to obtain leaching liquid containing scandium.
Further, the mixing unit is also provided with a second ore phase reconstruction agent inlet, and the second ore phase reconstruction agent inlet is used for supplying alkali metal inorganic salt and/or ammonium salt as the second ore phase reconstruction agent; the roasting unit comprises a second reaction device and a first heating device, wherein the second reaction device is connected with the reconstructed mineral acid salt outlet and is used for sequentially carrying out first roasting and second roasting on the mixture of the reconstructed mineral acid salt and the second mineral phase reconstruction agent; the first heating device is used for heating the second reaction device.
Further, the second reaction device is used for providing a reaction place of the first roasting process so as to perform the second reconstruction process, the roasting unit further comprises a third reaction device and a second heating device, and the third reaction device is connected with the second reaction device and is used for providing a reaction place of the second roasting process so as to perform the third mineral phase reconstruction process; the second heating device is used for heating the third reaction device.
Further, the roasting unit further comprises a pressure control device for adjusting the pressure in the third reaction device.
Further, the third reaction device is further provided with a regenerated reconstruction agent outlet, the roasting unit further comprises a mineral phase reconstruction agent recovery device, and the mineral phase reconstruction agent recovery device is respectively connected with the regenerated reconstruction agent outlet and the second mineral phase reconstruction agent inlet and is used for recovering the regenerated reconstruction agent generated by the third reaction device and returning the regenerated reconstruction agent to the mixing unit to serve as at least a part of the second mineral phase reconstruction agent.
Further, the third reaction device is further provided with a tail gas outlet, and the roasting unit further comprises a tail gas recovery device connected with the tail gas outlet and used for recovering tail gas generated by the third reaction device.
Further, the laterite-nickel ore smelting slag mixing unit comprises: the device comprises a first reaction device, a first feeding device, a second feeding device and a third feeding device, wherein the first reaction device is provided with a laterite-nickel ore smelting slag inlet, a first ore phase reconstruction agent inlet, a second ore phase reconstruction agent inlet and a reconstruction mineral acid salt outlet, and is used for providing a reaction place for a first ore phase reconstruction process; the first feeding device is connected with the laterite-nickel ore smelting slag inlet and is used for providing laterite-nickel ore smelting slag, and the second feeding device is connected with the first ore phase reconstruction agent inlet and is used for providing a first ore phase reconstruction agent; and the third feeding device is connected with the second ore phase reconstruction agent inlet and is used for providing the second ore phase reconstruction agent.
Further, the mixing unit further comprises a first stirring device, and the first stirring device is arranged in the first reaction device.
Further, the washing unit includes: the fourth reaction device is connected with the outlet of the roasting unit and is provided with a detergent inlet; the second stirring device is arranged in the fourth reaction device; and a fourth feed means connected to the detergent inlet for providing acid to the fourth reaction means.
Further, the washing unit further comprises a third heating means for adjusting the temperature in the fourth reaction means.
By applying the technical scheme of the application, after the laterite-nickel ore smelting slag is mixed with the ore phase reconstruction agent, the first reconstruction of the ore phase in the laterite-nickel ore smelting slag is realized, and meanwhile, the preparation is also carried out for the second and third reconstruction. The primary mechanism of the first reconstruction is the process of phase conversion of oxide ore in laterite-nickel ore smelting slag to the corresponding simple mineral acid salt. The main mechanism of the secondary reconstruction is the process that under the condition of low-temperature roasting, mineral acid salt and alkali metal ions or ammonia ions form double salt, and the conversion of simple mineral acid salt into double salt is the secondary reconstruction of mineral ore phase in laterite-nickel ore smelting slag. The main mechanism of the third reconstruction is the pyrolysis process of double salt, and after double salt pyrolysis, the impurity metal salt is pyrolyzed into the corresponding oxide ore phase again. During the pyrolysis of double salts and the pyrolysis of impurity metal salts, a large amount of heat is absorbed, which inhibits the pyrolysis of surrounding rare earth scandium double salts or inhibits the continued pyrolysis of simple scandium sulphates, which enables the selective leaching of valuable element scandium.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 illustrates a process flow diagram of a method for selectively leaching scandium from lateritic nickel ore smelting slag, provided in accordance with a preferred embodiment of the present application;
fig. 2 shows a block diagram of an apparatus for selectively leaching scandium from lateritic nickel ore smelting slag according to a preferred embodiment of the present application.
Wherein the above figures include the following reference numerals:
10. a mixing unit; 11. a first reaction device; 12. a first charging device; 13. a second charging device; 14. a third charging device; 20. a roasting unit; 21. a second reaction device; 22. a first heating device; 23. a third reaction device; 24. a second heating device; 25. a pressure control device; 26. a tail gas recovery device; 30. a washing unit; 31. a fourth reaction device; 32. a fourth feeding device; 33. and a third heating device.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The present application will be described in detail with reference to examples.
As described in the background art, the existing direct acid leaching method is adopted to leach the laterite-nickel ore, so that the problem of low leaching rate of rare earth elements exists. In order to solve the technical problems, the application provides a method for selectively leaching scandium from lateritic nickel ore smelting slag, which comprises the following steps: mixing laterite-nickel ore smelting slag with an aqueous solution of a first ore phase reconstruction agent to obtain a reconstructed mineral acid salt, wherein the first ore phase reconstruction agent comprises acid; roasting the reconstructed mineral acid salt at the medium temperature to obtain a medium temperature roasting product, wherein the temperature of the medium temperature roasting process is 500-800 ℃; and washing the intermediate-temperature roasting product to obtain a leaching solution containing scandium.
After the laterite-nickel ore smelting slag is mixed with the first ore phase reconstruction agent, the first reconstruction of the ore phase in the first laterite-nickel ore smelting slag is realized, and meanwhile, the preparation is also made for the subsequent reconstruction process. The main mechanism of the first reconstruction is the process of converting the oxide ore phase in the laterite-nickel ore smelting slag into the corresponding simple mineral acid salt under the action of acid. In the middle-temperature roasting process, the main mechanism of the reconstruction is the pyrolysis process of the reconstructed mineral acid salt, and after pyrolysis, the impurity metal salt is continuously pyrolyzed into a corresponding oxide ore phase. In the pyrolysis of the reconstituted mineral salt and the pyrolysis of the impurity metal salt, the process can inhibit the pyrolysis of scandium salt due to the large amount of heat absorption, which is beneficial to improving the leaching rate of scandium element in the selective leaching process.
The method can selectively leach valuable element scandium in lateritic nickel ore smelting slag, and the ore phase reconstruction agent can be recycled. The leachate has few impurity elements, low acidity, easy treatment of raffinate, easy solid-liquid separation and easy subsequent extraction steps. The leached slag is neutral and easy to treat.
The selective leaching method is beneficial to improving the leaching rate of scandium element in laterite smelting slag. In a preferred embodiment, the acid in the first mineral phase reconstituting agent includes, but is not limited to, HCl, HNO 3 And H 2 SO 4 One or more of the following. The laterite-nickel ore smelting slag reacts with acid to convert oxides contained in the laterite-nickel ore smelting slag into ions, scandium ions and the like are combined with acid radicals to be converted into mineral acid salts, and then the ore phase reconstruction process is completed.
In a preferred embodiment, the volume of the first mineral phase reconstituting agent required per gram of laterite nickel ore smelting slag is between 0.2 and 1.5mL when the concentration of the acid in the first mineral phase reconstituting agent is above 0.5 times the analytically pure concentration. The amount of the first mineral phase reconstruction agent includes, but is not limited to, the above range, and limiting the amount to the above range is beneficial to further improving the first mineral phase reconstruction rate and further improving the leaching rate of scandium element. More preferably, the volume of the first mineral phase restructuring agent required per gram of laterite nickel ore smelting slag is between 0.5 and 1mL when the concentration of the acid in the first mineral phase restructuring agent is above 0.5 times the analytically pure concentration.
In a preferred embodiment, the method further comprises, prior to subjecting the reconstituted mineral acid salt to the intermediate temperature calcination process: carrying out a low-temperature roasting process on the reconstructed mineral salt and a second mineral phase reconstruction agent to obtain a low-temperature roasting product, wherein the temperature of the low-temperature roasting process is 100-500 ℃, and the second mineral phase reconstruction agent comprises alkali metal inorganic salt and/or ammonium salt; and (3) performing a medium-temperature roasting process on the low-temperature roasting product to obtain a medium-temperature roasting product.
And forming double salts by the reconstituted mineral acid salt and alkali metal ions or ammonium ions in the second mineral phase reconstitution agent, so as to realize the reconstitution from simple mineral acid salt to double salt. The existence of alkali metal ions or ammonium ions in the double salt is beneficial to further inhibiting the pyrolysis of scandium double salt, and further beneficial to further improving the leaching rate of scandium element in the acid leaching process.
Preferably, the alkali metal inorganic salts in the second mineral phase reconstituting agent include, but are not limited to, na 2 SO 4 、K 2 SO 4 、NaCl、KCl、NaNO 3 、KNO 3 One or more of the following. Preferably, the ammonium salt in the second mineral phase reconstituting agent includes, but is not limited to (NH 4 ) 2 SO 4 And/or NH 4 HSO 4 . The types of alkali metal and ammonium salts include, but are not limited to, the above-mentioned ones, and the above-mentioned ones have good water solubility and are inexpensive, which is advantageous in reducing the process cost. Meanwhile, because the alkali metal ions and the ammonium ions have smaller volumes, the method is more beneficial to completing the ore phase reconstruction process, improves the ore phase reconstruction rate, and further improves the leaching rate of scandium element in the subsequent washing process.
In a preferred embodiment, the weight ratio of the second mineral phase restructuring agent required per gram of laterite-nickel ore slag is between 0.01 and 1. The weight ratio of the laterite-nickel ore to the second ore phase reconstruction agent includes but is not limited to the above range, and limiting the weight ratio to the above range is beneficial to further reducing the decomposition rate of rare earth scandium in the roasting process, and further beneficial to improving the leaching rate of rare earth scandium in the washing process.
In a preferred embodiment, the low temperature calcination process is for a period of 1 to 240 minutes. The temperature of the low temperature calcination process includes, but is not limited to, the above range, and limiting it to the above range is advantageous for improving the conversion rate of mineral acid salt to double salt. Preferably, the low temperature roasting process is performed for 30 to 180 minutes.
In a preferred embodiment, the intermediate temperature calcination process is for a period of 10 to 240 minutes. The time of the intermediate temperature roasting process includes, but is not limited to, the above range, and limiting the time to the above range is advantageous for improving the efficiency of thermal decomposition, and further advantageous for improving the leaching rate of scandium element in the washing process. Preferably, the intermediate temperature roasting process is carried out for 40-180 min.
The medium-temperature roasting process can be a temperature-changing process or a constant-temperature process. Preferably, when the intermediate temperature roasting process is an intermediate temperature varying process, the varying speed is 2-15 ℃/min.
In the above method for recovering rare earth element, the intermediate temperature calcination process may be performed under normal pressure or under negative pressure, and preferably, the intermediate temperature calcination process is a negative pressure calcination process. The middle-temperature roasting process is carried out under negative pressure, which is beneficial to reducing the temperature and the roasting time of the roasting process, thereby being beneficial to saving energy consumption and shortening the process period. And the medium-temperature roasting is carried out under the negative pressure at the same roasting temperature and roasting time, so that the decomposition efficiency in the roasting process is improved, and the leaching rate of the subsequent scandium element is improved.
The low-temperature roasting process is a temperature changing process or a constant temperature process. When the low-temperature roasting process is a temperature-changing process, preferably, the temperature rising rate is 5-15 ℃/min in the low-temperature roasting process. The rate of temperature rise includes, but is not limited to, the above ranges, and limiting it to the above ranges is advantageous in making the mineral acid salt conversion process milder and the conversion process more complete.
The washing process comprises the following steps: and washing the medium-temperature roasting material and the detergent under the stirring action. The intermediate-temperature roasting material is washed, scandium element can be dissolved into a liquid phase, and other impurity metal elements (such as iron, chromium, silicon, part of aluminum, calcium and the like) enter solid slag, so that scandium element is selectively leached.
In the washing process, the dosage of the medium-temperature roasting material and the detergent, the leaching time and the stirring intensity can be selected from the parameter ranges commonly used in the field. In order to further improve the leaching rate of scandium element, preferably, the detergent is acid liquor with the pH value of 2.5-3.2, the dosage of the acid liquor corresponding to each gram of medium-temperature roasting material is 2-15 mL, the leaching time is 10-240 min, and the stirring strength is 100-400 rpm.
In a preferred embodiment, the temperature of the washing process is 15-90 ℃. The temperature of the washing process includes, but is not limited to, the above range, and limiting it to the above range is advantageous to further increase the leaching rate of scandium element.
In another aspect of the present application there is provided an apparatus for selectively leaching scandium from lateritic nickel ore smelting slag, as shown in figure 2, according to another aspect of the present application there is provided an apparatus for selectively leaching scandium from lateritic nickel ore smelting slag, the apparatus comprising: a mixing unit 10, a roasting unit 20 and a washing unit 30. The mixing unit 10 is provided with a laterite-nickel ore smelting slag inlet, a first ore phase reconstruction agent inlet and a reconstruction mineral acid salt outlet, and the mixing unit 10 is used for carrying out primary ore phase reconstruction on the laterite-nickel ore smelting slag under the action of the first ore phase reconstruction agent to obtain a reconstruction mineral acid salt, wherein the first ore phase reconstruction agent inlet is used for supplying acid as the first ore phase reconstruction agent; the roasting unit 20 is connected with the reconstructed mineral acid salt outlet, and the roasting unit 20 is used for roasting the reconstructed mineral acid salt in sequence so as to reconstruct the mineral phase of the reconstructed mineral acid salt at least once; the washing unit 30 is connected to the outlet of the roasting unit 20, and the washing unit 30 has a detergent inlet for washing the roasting product discharged from the roasting unit 20 to obtain a leaching solution containing scandium.
According to the mixing unit 10 in the device provided by the application, the laterite-nickel ore smelting slag is mixed with the first ore phase reconstruction agent, so that the ore phase structure of scandium element carrier minerals is destroyed, metal oxides in the laterite-nickel ore smelting slag are converted into corresponding simple sulfate, chloride, nitrate or other reconstruction mineral acid salts, the first reconstruction of the metal ore phase in the laterite-nickel ore smelting slag is realized, and meanwhile, the subsequent reconstruction process is prepared. The reconstituted mineral acid salt then enters the firing unit 20 for a medium temperature firing process to effect at least one reconstitution process. In the intermediate temperature roasting process, the reconstituted mineral acid salt and the impurity metal salt are then pyrolyzed, and after pyrolysis, are converted into corresponding oxide ore phases. Meanwhile, in the pyrolysis of the reconstructed mineral salt and the pyrolysis of the impurity metal salt, a large amount of heat can be absorbed, so that the occurrence of pyrolysis of scandium salt can be restrained. And then the roasting product enters a washing unit 30 for washing to obtain leaching liquid containing scandium. Therefore, the device provided by the application can realize the effect of efficiently and selectively leaching scandium element from lateritic nickel ore smelting slag.
The device provided by the application is beneficial to improving the leaching rate of scandium element in lateritic nickel ore smelting slag. In a preferred embodiment, the roasting unit 20 comprises only one reaction device in which the reconstituted mineral salt is roasted to effect a secondary mineral phase reconstitution process.
In another preferred embodiment, the roasting unit 20 comprises two or more reaction devices, and the temperature in each reaction device is sequentially increased along the flow direction of the reconstituted mineral acid salt, thereby realizing the two subsequent mineral phase reconstitution processes.
In order to further increase the leaching rate of scandium element, in a further preferred embodiment, as shown in fig. 2, the mixing unit 10 is further provided with a second mineral phase reconstitution agent inlet for supplying an alkali metal inorganic salt and/or ammonium salt as a second mineral phase reconstitution agent; the baking unit 20 includes: a second reaction device 21 and a first heating device 22. The second reaction device 21 is connected with the reconstructed mineral acid salt outlet and is used for sequentially performing first roasting and second roasting on the mixture of the reconstructed mineral acid salt and the second ore phase reconstruction agent; the first heating device 22 is used for heating the second reaction device 21. The mixture of the reconstituted mineral acid salt and the second mineral phase reconstituting agent is subjected to low temperature calcination and medium temperature calcination, respectively, by the first heating device 22 to effect a second and third mineral phase reconstitution.
Preferably, the first heating device 22 is in communication with a flue gas waste heat recovery device to use heat recovered from the flue gas as a heat source.
In order to achieve continuous production, the time required for continuous treatment is shortened, and the second and third mineral phase reconfigurations can be carried out in two reaction devices. In a preferred embodiment, as shown in fig. 2, the second reaction device 21 is used to provide a reaction site for the first calcination process to perform the second reconstitution process, and the calcination unit 20 further comprises a third reaction device 23 and a second heating device 24. The third reaction device 23 is connected with the second reaction device 21 and is used for providing a reaction place of the second roasting process so as to perform a third ore phase reconstruction process; the second heating means 24 is used for heating the third reaction means 23.
In a preferred embodiment, as shown in fig. 2, the roasting unit 20 further comprises a pressure control device 25, the pressure control device 25 being used to adjust the pressure in the third reaction device 23. The intermediate temperature roasting process can be carried out under normal pressure or under negative pressure. The pressure control device 25 is a vacuum pumping device or a spraying device, and the pressure in the third reaction device 23 is negative pressure, which is favorable for reducing the temperature and the roasting time in the roasting process, thereby being favorable for saving energy consumption and shortening the process period, and meanwhile, the medium-temperature roasting is performed under the same roasting temperature and roasting time under the negative pressure, so that the decomposition efficiency in the roasting process is favorable for improving the leaching rate of the subsequent scandium element.
In order to save costs and avoid wasting resources while fully utilizing the materials added during the process, the third reaction device 23 preferably further has a regeneration and reconstruction agent outlet, and the roasting unit 20 further includes a mineral phase reconstruction agent recovery device connected to the regeneration and reconstruction agent outlet and the second mineral phase reconstruction agent inlet, respectively, for recovering the regeneration and reconstruction agent generated by the third reaction device 23 and returning it to the mixing unit 10 as at least a part of the second mineral phase reconstruction agent.
In order to avoid air pollution during the pyrolysis of double salts during the medium temperature roasting, the third reaction device 23 further has a tail gas outlet, and in a preferred embodiment, the roasting unit 20 further comprises a tail gas recovery device 26, and the tail gas recovery device 26 is connected to the tail gas outlet for recovering the tail gas generated by the third reaction device 23.
In a preferred embodiment, the mixing unit 10 comprises a first reaction device 11, a first feeding device 12, a second feeding device 13 and a third feeding device 14, the first reaction device 11 having a laterite nickel ore smelting slag inlet, a first ore phase reconstruction agent inlet, a second ore phase reconstruction agent inlet and a reconstruction mineral acid salt outlet, the first reaction device 11 being adapted to provide a reaction site for a first ore phase reconstruction process; the first feeding device 12 is connected with the laterite-nickel ore smelting slag inlet and is used for providing laterite-nickel ore smelting slag; the second feeding device 13 is connected with the first ore phase reconstruction agent inlet and is used for providing the first ore phase reconstruction agent; and a third charging device 14 is connected to the second mineral phase reconstituting agent inlet for providing a second mineral phase reconstituting agent.
When the device provided by the application is used for treating laterite-nickel ore smelting slag, the addition sequence of the first ore phase reconstruction agent and the second ore phase reconstruction agent does not influence the first ore phase reconstruction in the laterite-nickel ore smelting slag, so that the leaching rate of scandium element in the finally obtained leaching solution is not influenced, and the addition sequence of the two ore phase reconstruction agents can be automatically adjusted by adopting the device.
In order to fully and uniformly mix the laterite-nickel ore smelting slag and the first ore phase reconstruction agent so as to increase the completion degree of the first ore phase reconstruction, and simultaneously fully and uniformly mix the laterite-nickel ore smelting slag and the optional second ore phase reconstruction agent, the preparation is made for the second ore phase reconstruction and the third ore phase reconstruction. In a preferred embodiment, the mixing unit 10 further comprises a first stirring device, which is arranged in the first reaction device 11.
In a preferred embodiment, the washing unit 30 comprises a fourth reaction means 31, a second stirring means and a fourth feeding means 32, the fourth reaction means 31 being connected to the outlet of the roasting unit 20, the fourth reaction means 31 having a detergent inlet; the second stirring device is arranged in the fourth reaction device 31; and a fourth feeding means 32 is connected to the detergent inlet for feeding acid into the fourth reaction means 31. In the washing unit 30, acid is added to the fourth reaction device 31 to wash the second baked product, so that the leaching rate of scandium element in the washing process is improved under the stirring of the second stirring device.
In order to further shorten the process cycle and further improve the leaching rate of scandium in the leaching solution, the temperature of the washing process can be controlled. In a preferred embodiment, the washing unit 30 further comprises: and a third heating means 33, the third heating means 33 being for adjusting the temperature in the fourth reaction means 31. Preferably, the third heating means 33 is a thermostatic device to limit the temperature in the washing unit to a more constant range.
The application is described in further detail below in connection with specific examples which are not to be construed as limiting the scope of the application as claimed.
The main components of the laterite-nickel ore smelting slag raw materials used in the examples are shown in table 1.
TABLE 1
| Element(s) | Ni | Co | Al | Cr | Cu | Fe | Mg | Mn | Sc | Zn | Si |
| Content by weight percent | 0.416 | 0.041 | 2.536 | 0.049 | 0.03 | 8.919 | 0.01 | 0.247 | 0.032 | 0.05 | 3.6 |
Example 1
Smelting slag of laterite nickel ore or a first ore phase reconstruction agent (9 mol/L H) 2 SO 4 ) Mixing uniformly according to the proportion of 1g to 1mL to obtain the reconstituted mineral acid salt. And (5) finishing the first reconstruction of the ore phase in the laterite-nickel ore smelting slag.
Smelting slag from laterite nickel ore and a second ore phase reconstruction agent (0.1 mol Na 2 SO 4 Solution) was used in a 1g to 1ml ratio, the reconstituted mineral acid salt was mixed with a second mineral phase reconstituting agent, then warmed from room temperature to 450 ℃ at 10 ℃/min, and held at temperature for 2 hours to effect a second reconstitution process. And then the low-temperature roasting product is raised to 650 ℃ from 450 ℃ and roasted for 4 hours at 650 ℃ to reconstruct the laterite-nickel ore smelting slag ore phase for the third time, so as to obtain a medium-temperature roasting product. Cooling to below 300 ℃ along with the furnace after roasting.
Washing the intermediate-temperature roasting product with sulfuric acid with pH=3 according to the solid-to-liquid ratio of 1g to 5mL under stirring, wherein the treatment temperature is 60 ℃, the leaching time is 30min, and the stirring intensity is 300rpm, so as to obtain leaching liquid. The leaching solution is analyzed, the leaching rate of rare earth scandium element is 93wt%, the leaching rate of iron element is 2.2wt%, the leaching rate of chromium element is less than 1wt%, the leaching rate of silicon element is less than 0.5wt%, and the leaching rate of aluminum element is less than 15wt%, so that efficient selective leaching of valuable element scandium is realized.
Example 2
Mixing laterite-nickel ore smelting slag and a first ore phase reconstruction agent according to the proportion of 1g to 0.8mL to obtain a reconstructed mineral acid salt, wherein the first ore phase reconstruction agent is analytically pure H 2 SO 4 The weight ratio of the mixed solution to the analytically pure HCl solution is 5:1.
The reconstructed mineral acid salt is heated from room temperature to 450 ℃ at 10 ℃/min and is roasted for 2 hours at 450 ℃ to reconstruct the laterite-nickel ore smelting slag phase for the second time, thus obtaining a low-temperature roasting product.
Raising the temperature of the low-temperature roasting product from 450 ℃ to 680 ℃, roasting at 680 ℃ for 1h, and carrying out third reconstruction on the laterite-nickel ore smelting slag phase to obtain a high-temperature roasting product, and cooling the high-temperature roasting product to below 300 ℃ along with a furnace after roasting.
Washing the high-temperature roasting product and sulfuric acid with pH=3 according to a solid-to-liquid ratio of 1g to 5mL under stirring, wherein the treatment temperature is 60 ℃, the leaching time is 30min, and the stirring intensity is 300rpm, so as to obtain leaching liquid. The leaching solution is analyzed, the leaching rate of scandium element is 90wt%, the leaching rate of iron element is less than 1wt%, the leaching rate of chromium element is less than 1wt%, the leaching rate of silicon element is less than 0.5wt%, and the leaching rate of aluminum element is less than 15wt%, so that efficient selective leaching of valuable element scandium is realized.
Example 3
The differences from example 1 are: the temperature of the intermediate temperature roasting process is 400 ℃.
The leaching rate of rare earth scandium element is 85wt%, the leaching rate of iron element is 1.90wt%, the leaching rate of chromium element is less than 1wt%, the leaching rate of silicon element is less than 0.5wt%, and the leaching rate of aluminum element is less than 50wt%.
Example 4
The differences from example 1 are: laterite-nickel ore smelting slag and a first ore phase reconstruction agent (9 mol/L H) 2 SO 4 ) The dosage ratio of (2) is1g:0.3mL。
The leaching rate of rare earth scandium element is 87wt%, the leaching rate of iron element is 2.05wt%, the leaching rate of chromium element is 1wt%, the leaching rate of silicon element is 0.5wt%, and the leaching rate of aluminum element is less than 50wt%.
Example 5
The differences from example 1 are: the time of the intermediate temperature roasting process is 20min.
The leaching rate of rare earth scandium element is 88wt%, the leaching rate of iron element is 1.85wt%, the leaching rate of chromium element is less than 1wt%, the leaching rate of silicon element is less than 0.5wt%, and the leaching rate of aluminum element is less than 50wt%.
Example 6
The differences from example 1 are: the temperature of the washing process was 10 ℃.
The leaching rate of rare earth scandium element is 92wt%, the leaching rate of iron element is 2.10wt%, the leaching rate of chromium element is less than 1wt%, the leaching rate of silicon element is less than 0.5wt%, and the leaching rate of aluminum element is less than 10wt%.
Example 7
The differences from example 1 are: the weight of the second ore phase reconstruction agent required per gram of laterite-nickel ore smelting slag is 0.005g.
The leaching rate of rare earth scandium element is 85wt%, the leaching rate of iron element is 2.1wt%, the leaching rate of chromium element is less than 1wt%, the leaching rate of silicon element is less than 0.5wt%, and the leaching rate of aluminum element is less than 15wt%.
Comparative example 1
The differences from example 1 are: and directly leaching the laterite-nickel ore smelting slag with sulfuric acid.
The leaching rate of rare earth scandium element is less than 70wt%, the leaching rate of iron element is 15.10wt%, the leaching rate of chromium element is 40wt%, the leaching rate of silicon element is 5.5wt%, and the leaching rate of aluminum element is less than 50wt%.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
as can be seen from the comparison of examples 1 to 7 and comparative example 1, the method for feeding and discharging provided by the application is beneficial to improving the leaching rate of scandium element.
As is clear from comparison of examples 1 and 3, limiting the temperature during the medium-temperature firing to the preferred range of the present application is advantageous in improving the leaching rate of scandium element.
As can be seen from comparing examples 1 and 4, the laterite-nickel ore smelting slag was admixed with a first ore phase reconstitution agent (9 mol/L H 2 SO 4 ) The ratio of the dosage is limited in the preferred range of the application, which is beneficial to improving the leaching rate of scandium element.
As is clear from comparison of examples 1 and 5, limiting the time of the medium-temperature roasting process to the preferred range of the present application is advantageous in improving the leaching rate of scandium element.
As is clear from comparison of examples 1 and 6, limiting the temperature of the washing process to the preferred range of the present application is advantageous in improving the purity of scandium element.
Comparing examples 1 and 7, it is found that limiting the weight of the second mineral phase reconstruction agent required per gram of laterite-nickel ore slag within the preferred range of the present application advantageously increases the leaching rate of scandium element.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (24)
1. A method of selectively leaching scandium from lateritic nickel ore smelting slag, the method comprising:
mixing the laterite-nickel ore smelting slag with an aqueous solution of a first ore phase reconstruction agent to obtain a reconstructed mineral acid salt, wherein the first ore phase reconstruction agent comprises acid;
roasting the reconstructed mineral acid salt at a medium temperature to obtain a medium temperature roasting product, wherein the temperature of the medium temperature roasting process is 500-800 ℃; and
Washing the intermediate-temperature roasting product to obtain a leaching solution containing scandium;
before subjecting the reconstituted mineral acid salt to the medium temperature calcination process, the method further comprises:
carrying out a low-temperature roasting process on the reconstructed mineral salt and a second mineral phase reconstruction agent to obtain a low-temperature roasting product, wherein the temperature of the low-temperature roasting process is 100-500 ℃, and the second mineral phase reconstruction agent comprises alkali metal inorganic salt and/or ammonium salt;
and carrying out the medium-temperature roasting process on the low-temperature roasting product to obtain the medium-temperature roasting product.
2. The method of claim 1, wherein the acid in the first mineral phase reconstituting agent is selected from the group consisting of HCl, HNO 3 And H 2 SO 4 One or more of the following;
the concentration of the acid in the first ore phase reconstruction agent is more than 0.5 times of the analytically pure concentration, and the volume of the first ore phase reconstruction agent required by each gram of laterite-nickel ore smelting slag is 0.2-1.5 mL.
3. The method of claim 2, wherein the concentration of the acid in the first mineral phase reconstituting agent is greater than 0.5 times the analytically pure concentration, and the volume of the first mineral phase reconstituting agent required per gram of laterite-nickel ore smelting slag is between 0.5 and 1mL.
4. A method according to any one of claims 1 to 3, wherein the alkali metal inorganic salt in the second mineral phase reconstituting agent is selected from Na 2 SO 4 、K 2 SO 4 、NaCl、KCl、NaNO 3 And KNO 3 One or more of the following;
the ammonium salt in the second mineral phase reconstituting agent is (NH) 4 ) 2 SO 4 And/or NH 4 HSO 4 。
5. A method according to any one of claims 1 to 3, wherein the weight of the second mineral phase restructuring agent required per gram of laterite nickel ore smelting slag is 0.01 to 1g.
6. The method of claim 5, wherein the weight of the second mineral phase restructuring agent required per gram of laterite nickel ore slag is 0.1 to 0.5g.
7. The method according to claim 4, wherein the low temperature roasting process is performed for 1 to 240 minutes.
8. The method of claim 7, wherein the medium temperature firing process is for a period of 10 to 240 minutes.
9. The method according to claim 1, wherein the medium temperature roasting process is a temperature change process, and the temperature change rate in the medium temperature roasting process is 2-15 ℃/min.
10. A method according to any one of claims 1 to 3, wherein the medium temperature firing process is a negative pressure firing process.
11. The method according to claim 4, wherein the low temperature roasting process is a temperature changing process, and the temperature rising rate in the low temperature roasting process is 5-15 ℃/min.
12. The method of claim 1, wherein the washing process comprises: and (3) under the stirring action, leaching the intermediate-temperature roasting product and the detergent.
13. The method according to claim 12, wherein the detergent is an acid solution with a pH of 2.5-3.2, the amount of the acid solution is 2-15 mL per gram of the intermediate temperature roasting product, the leaching time is 10-240 min, and the stirring intensity is 100-400 rpm.
14. The method according to claim 12 or 13, wherein the temperature of the washing process is 15-90 ℃.
15. An apparatus for selective leaching of scandium from lateritic nickel ore smelting slag according to any of claims 1 to 14, wherein the apparatus comprises:
a mixing unit (10) having a laterite-nickel ore smelting slag inlet, a first mineral phase reconstituting agent inlet and a reconstituted mineral acid salt outlet, the mixing unit (10) being configured to perform a first mineral phase reconstitution of the laterite-nickel ore smelting slag under the action of the first mineral phase reconstituting agent to obtain a reconstituted mineral acid salt, wherein the first mineral phase reconstituting agent inlet is configured to supply an acid as the first mineral phase reconstituting agent;
the roasting unit (20), the said roasting unit (20) links with said and reconstructs the mineral acid salt outlet port, the said roasting unit (20) is used for roasting the said and reconstructing the mineral acid salt sequentially, in order to reconstruct the mineral acid salt and reconstruct at least one ore phase;
the washing unit (30) is connected with the outlet of the roasting unit (20), and the washing unit (30) is provided with a detergent inlet and is used for washing the roasting product discharged by the roasting unit (20) to obtain leaching liquid containing scandium; the mixing unit (10) is also provided with a second mineral phase reconstituting agent inlet for supplying an alkali metal inorganic salt and/or ammonium salt as a second mineral phase reconstituting agent.
16. The apparatus of claim 15, wherein the device comprises a plurality of sensors,
the firing unit (20) includes:
a second reaction device (21) connected to the reconstituted mineral acid salt outlet for sequentially conducting a first calcination and a second calcination of the mixture of the reconstituted mineral acid salt and the second mineral phase reconstituted agent;
and a first heating device (22) for heating the second reaction device (21).
17. The apparatus according to claim 16, wherein the second reaction means (21) is adapted to provide a reaction site for the first calcination process for a second reconstitution process, the calcination unit (20) further comprising:
a third reaction device (23), wherein the third reaction device (23) is connected with the second reaction device (21) and is used for providing a reaction place of the second roasting process so as to perform a third ore phase reconstruction process;
-second heating means (24) for heating said third reaction means (23).
18. The apparatus according to claim 17, wherein the firing unit (20) further comprises:
and a pressure control device (25), wherein the pressure control device (25) is used for adjusting the pressure in the third reaction device (23).
19. The apparatus according to claim 17, wherein the third reaction device (23) further has a regeneration-reconfigurating agent outlet, the roasting unit (20) further comprising:
and the ore phase reconstruction agent recovery device is respectively connected with the regenerated reconstruction agent outlet and the second ore phase reconstruction agent inlet and is used for recovering the regenerated reconstruction agent generated by the third reaction device (23) and returning the regenerated reconstruction agent to the mixing unit (10) as at least a part of the second ore phase reconstruction agent.
20. The apparatus according to claim 19, wherein the third reaction device (23) further has a tail gas outlet, the roasting unit (20) further comprising:
and the tail gas recovery device (26) is connected with the tail gas outlet and is used for recovering the tail gas generated by the third reaction device (23).
21. The apparatus according to claim 15, characterized in that the mixing unit (10) of laterite-nickel ore smelting slag comprises:
a first reaction device (11), the first reaction device (11) having the laterite nickel ore smelting slag inlet, the first ore phase reconstruction agent inlet, a second ore phase reconstruction agent inlet, and the reconstructed mineral acid salt outlet, the first reaction device (11) being configured to provide a reaction site for the first ore phase reconstruction process;
the first feeding device (12) is connected with the laterite-nickel ore smelting slag inlet and is used for providing the laterite-nickel ore smelting slag;
the second feeding device (13) is connected with the first ore phase reconstruction agent inlet and is used for providing the first ore phase reconstruction agent; and
and the third feeding device (14) is connected with the second ore phase reconstruction agent inlet and is used for providing the second ore phase reconstruction agent.
22. The apparatus according to claim 21, wherein the mixing unit (10) further comprises a first stirring device, which is arranged within the first reaction device (11).
23. The device according to claim 22, characterized in that the washing unit (30) comprises:
a fourth reaction device (31), the fourth reaction device (31) being connected to the outlet of the roasting unit (20), the fourth reaction device (31) having the detergent inlet;
a second stirring device disposed within the fourth reaction device (31); and
-fourth feeding means (32), said fourth feeding means (32) being connected to said detergent inlet for providing acid into said fourth reaction means (31).
24. The apparatus according to claim 23, wherein the washing unit (30) further comprises: -third heating means (33), said third heating means (33) being adapted to regulate the temperature inside said fourth reaction means (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910214704.1A CN109777973B (en) | 2019-03-20 | 2019-03-20 | Method and device for selectively leaching scandium from lateritic nickel ore smelting slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910214704.1A CN109777973B (en) | 2019-03-20 | 2019-03-20 | Method and device for selectively leaching scandium from lateritic nickel ore smelting slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109777973A CN109777973A (en) | 2019-05-21 |
| CN109777973B true CN109777973B (en) | 2023-09-29 |
Family
ID=66488466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910214704.1A Active CN109777973B (en) | 2019-03-20 | 2019-03-20 | Method and device for selectively leaching scandium from lateritic nickel ore smelting slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109777973B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114480887B (en) * | 2021-12-16 | 2024-01-09 | 中南大学 | Method for selectively extracting scandium from lateritic nickel ore by sulfuric acid roasting-water leaching method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014177391A (en) * | 2013-02-15 | 2014-09-25 | Sumitomo Metal Mining Co Ltd | Method for recovering scandium |
| CN104726724A (en) * | 2015-04-20 | 2015-06-24 | 中国恩菲工程技术有限公司 | Method for extracting scandium from nickel laterite ores |
| JP2016065283A (en) * | 2014-09-25 | 2016-04-28 | 住友金属鉱山株式会社 | Method for recovering scandium |
| CN106086436A (en) * | 2016-07-28 | 2016-11-09 | 北京科技大学 | A kind of Selectively leaching scandium and method of sodium from Bayer red mud |
| CN106636614A (en) * | 2017-01-17 | 2017-05-10 | 东北大学 | Method for leaching niobium, scandium and rare earth elements from tailings |
| CN108384956A (en) * | 2018-04-13 | 2018-08-10 | 长沙有色冶金设计研究院有限公司 | A kind of recovery method of red mud |
| CN109112293A (en) * | 2018-10-26 | 2019-01-01 | 广西大学 | A method of the selective enrichment scandium from Bayer process red mud |
-
2019
- 2019-03-20 CN CN201910214704.1A patent/CN109777973B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014177391A (en) * | 2013-02-15 | 2014-09-25 | Sumitomo Metal Mining Co Ltd | Method for recovering scandium |
| JP2016065283A (en) * | 2014-09-25 | 2016-04-28 | 住友金属鉱山株式会社 | Method for recovering scandium |
| CN104726724A (en) * | 2015-04-20 | 2015-06-24 | 中国恩菲工程技术有限公司 | Method for extracting scandium from nickel laterite ores |
| CN106086436A (en) * | 2016-07-28 | 2016-11-09 | 北京科技大学 | A kind of Selectively leaching scandium and method of sodium from Bayer red mud |
| CN106636614A (en) * | 2017-01-17 | 2017-05-10 | 东北大学 | Method for leaching niobium, scandium and rare earth elements from tailings |
| CN108384956A (en) * | 2018-04-13 | 2018-08-10 | 长沙有色冶金设计研究院有限公司 | A kind of recovery method of red mud |
| CN109112293A (en) * | 2018-10-26 | 2019-01-01 | 广西大学 | A method of the selective enrichment scandium from Bayer process red mud |
Non-Patent Citations (1)
| Title |
|---|
| 舒方霞等.《硫酸化焙烧-浸出法处理镍红土矿工艺研究》.《材料研究与应用》.2012,第6卷(第6期),第69-73页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109777973A (en) | 2019-05-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101509072B (en) | Method for extracting valuable metals from laterite nickel mine with hydrochloric acid full-closed circulation method | |
| CN109811122B (en) | Extraction method of rare earth oxide | |
| CN101538652B (en) | Method for separating and recovering vanadium and chrome from vanadium and chrome-containing waste | |
| CN101824554B (en) | Liquid alkali roasting decomposition extraction process of mixed rare earth concentrates | |
| CN108004391B (en) | A method of processing lepidolite extracts metallic element | |
| CN101575673B (en) | Method for separating and extracting copper and cobalt-nickel in low-grade complex mixed copper-cobalt ore | |
| CN101275187A (en) | Process for extracting vanadium by stone coal wet method | |
| CN107299223B (en) | A kind of compound alkaline-leaching and vanadium extraction method of bone coal and its system | |
| CN110921688B (en) | Active magnesium oxide and preparation method and application thereof | |
| CN109811135B (en) | Method and device for selectively extracting rare earth oxide from red mud | |
| CN107758705B (en) | Zinnwaldite extracts lithium carbonate technique | |
| CN107619941A (en) | The method that vanadium and chromium are separated from vanadium chromium slag | |
| CN112410588A (en) | Roasting process of bastnaesite | |
| CN109136590A (en) | A kind of packet header mixed rare earth concentrate decomposition processing process | |
| CN108425013B (en) | Method for removing manganese dithionate in manganese ore desulfurization solution | |
| CN103555942A (en) | Method of decomposing tungsten concentrate | |
| CN109777973B (en) | Method and device for selectively leaching scandium from lateritic nickel ore smelting slag | |
| CN109338114A (en) | A method of separating vanadium and chromium from vanadium chromium slag | |
| CN116716480B (en) | Method for recycling multiple metals in red mud by high-acid leaching crystallization precipitation method | |
| CN109797297A (en) | The method of sodium roasting vanadium-extracting in concentrate containing vanadium iron | |
| CN106591579B (en) | Method for selectively extracting nickel, cobalt and iron from laterite-nickel ore | |
| CN101824531A (en) | Liquid alkali low-temperature roasting decomposition process of caustic soda liquid of mixed rare earth concentrates | |
| CN109762998A (en) | The method and device of Selectively leaching valuable element from slag | |
| CN109750168A (en) | The method and device of Selectively leaching scandium, nickel and cobalt element from laterite metallurgical slag | |
| CN105838908A (en) | Efficient and clean molybdenum smelting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |