CN103484694A - Method for extracting bismuth from copper-bismuth concentrate - Google Patents
Method for extracting bismuth from copper-bismuth concentrate Download PDFInfo
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- CN103484694A CN103484694A CN201310372427.XA CN201310372427A CN103484694A CN 103484694 A CN103484694 A CN 103484694A CN 201310372427 A CN201310372427 A CN 201310372427A CN 103484694 A CN103484694 A CN 103484694A
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- bismuth
- copper
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- leaching
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- 229910052797 bismuth Inorganic materials 0.000 title claims abstract description 71
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 title claims abstract description 70
- -1 copper-bismuth Chemical compound 0.000 title claims abstract description 26
- 239000012141 concentrate Substances 0.000 title abstract description 6
- 238000002386 leaching Methods 0.000 claims abstract description 23
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000011707 mineral Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 230000003472 neutralizing Effects 0.000 claims description 8
- 230000005591 charge neutralization Effects 0.000 claims description 7
- 230000001264 neutralization Effects 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 7
- 230000002000 scavenging Effects 0.000 claims description 7
- AHUBLGVDRKDHAT-UHFFFAOYSA-N [Bi]=O.[Cl] Chemical compound [Bi]=O.[Cl] AHUBLGVDRKDHAT-UHFFFAOYSA-N 0.000 claims description 4
- 241001417490 Sillaginidae Species 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000000284 extract Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 3
- 238000009854 hydrometallurgy Methods 0.000 abstract description 3
- 150000002739 metals Chemical class 0.000 abstract description 3
- 235000010755 mineral Nutrition 0.000 abstract 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract 2
- 238000003756 stirring Methods 0.000 abstract 2
- GLQBXSIPUULYOG-UHFFFAOYSA-M Bismuth oxychloride Chemical compound Cl[Bi]=O GLQBXSIPUULYOG-UHFFFAOYSA-M 0.000 abstract 1
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract 1
- 235000010216 calcium carbonate Nutrition 0.000 abstract 1
- GJYLKIZKRHDRER-UHFFFAOYSA-N calcium;sulfuric acid Chemical compound [Ca].OS(O)(=O)=O GJYLKIZKRHDRER-UHFFFAOYSA-N 0.000 abstract 1
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 238000010409 ironing Methods 0.000 abstract 1
- 239000002244 precipitate Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 15
- RBTARNINKXHZNM-UHFFFAOYSA-K Iron(III) chloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 8
- 239000000460 chlorine Substances 0.000 description 6
- 229910052801 chlorine Inorganic materials 0.000 description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 6
- 238000011069 regeneration method Methods 0.000 description 6
- 235000019580 granularity Nutrition 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- WMWLMWRWZQELOS-UHFFFAOYSA-N Bismuth(III) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- UJZJSFZBAKDUFC-UHFFFAOYSA-N Bismuth sulfide Chemical compound [S-2].[S-2].[S-2].[BiH3+3].[BiH3+3] UJZJSFZBAKDUFC-UHFFFAOYSA-N 0.000 description 1
- ZVFDEWVVVBNBHW-UHFFFAOYSA-N Cl.ON=O Chemical compound Cl.ON=O ZVFDEWVVVBNBHW-UHFFFAOYSA-N 0.000 description 1
- 241000950629 Icteria Species 0.000 description 1
- 230000002378 acidificating Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 150000001804 chlorine Chemical class 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910001510 metal chloride Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory Effects 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000002351 wastewater Substances 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
Abstract
The invention relates to a method for extracting bismuth from copper-bismuth concentrate. The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for extracting bismuth by leaching copper-bismuth-molybdenum minerals. The technical scheme is as follows: the method comprises the following steps: mixing and stirring copper-bismuth-molybdenum minerals containing 4-14 wt% of bismuth for leaching while keeping the pH value of the solution at 0.3-0.6; stirring the leach solution with CaCO3 used as a neutralizer to precipitate bismuth; sending the precipitate to the next mineral separation or smelting process to obtain bismuth oxochloride and valuable metals; carrying out oxidation de-ironing and sulfuric acid calcium removal on the bismuth precipitation solution; and returning the obtained purified solution to the leaching step for cyclic use. The method can extract bismuth from copper-bismuth-molybdenum minerals more simply and effectively, so that the bismuth can be well separated from other metals. The method has the advantages of low production cost, high efficiency, high safety and reliability and no environment pollution.
Description
Technical field
The invention belongs to technical field of wet metallurgy, be specifically related to a kind of method that copper bismuth molybdenum ore extracts bismuth that leaches.
Background technology
At occurring in nature, the form with free metal and mineral exists bismuth, and mineral have bismuthinite, bismite etc.Although pyrometallurgical smelting exists SO
2pollution problem, but for bismuth mineral of high grade, that composition is single, be still at present the main method that bismuth is smelted.And low-grade bismuth concentrate, bismuth chats, low-grade sulphide ores that complicated difficult is selected adopt the reverberatory furnace pyrometallurgical smelting, not only the rate of recovery is low, and is difficult to refining output high-quality essence bismuth.The later stage sixties 20th century, China starts to be devoted to the research of bismuth mineral hydrometallurgy new process, formed with iron trichloride and made leaching agent, leach bismuth in the acid chlorine salt system, make bismuth in mineral enter solution with the form of bismuth Chloro complex, by iron replacement output sponge bismuth, through pyrorefining, produce smart bismuth.
In recent years, many R&D institutions both domestic and external form according to the difference of bismuth sulfide ore in succession, around reducing operating cost, solve environmental pollution, the enrichment problem of valuable metal concentration in the regeneration of iron trichloride and solution, many new hydrometallurgy flow processs have been studied, the heavy bismuth method of leach-hydrolysis of iron trichloride leaching-iron replacement method, iron trichloride leaching-diaphragm electrodeposition method, iron trichloride, chlorine gas selecting lixiviation process, hydrochloric acid nitrous acid system etc.
Above-mentioned several method has all been used iron trichloride or chlorine, use iron trichloride to have the Fe(II) problem of regeneration, the Fe(II) will use chlorine in the time of regeneration Fe(III), the use of chlorine has not only improved cost but also has existed very large safety problem.The use of electrolysis and iron powder etc. also allows technical process more complicated, complex operation, and cost increase etc. has produced many new problems.
The heavy bismuth method of new chlorination-hydrolysis, Tang Motang etc. have proposed a kind of Wet-process metallurgy method of new processing bismuth concentrate on the basis of research for many years---and the bismuth method is sunk in new chlorination hydrolysis.At the temperature of 36～378K, adopt two sections circulating leachings, greatly improved the leaching rate of recovery of bismuth.The characteristics of this flow process are to have adopted a kind of acidic aqueous solution that contains metal chloride (A#CA), it has the advantage of iron trichloride and chlorinated with chlorine agent concurrently, solved the circulation accumulation problem of iron in the regeneration of leaching agent and solution, and the bi concns in solution is improved greatly, the corresponding expanded of the throughput of subsequent handling.
Although the heavy bismuth method of this new chlorination-hydrolysis has improved the rate of recovery of bismuth, solved the problems such as circulation accumulation of iron in the regeneration of leaching agent and solution, also exist problem in actual production, because it needs heating, need to use chlorine, this has increased cost, has reduced security; Although leaching yield is higher, simultaneously a lot of precious metals are also immersed out, make its part enter leach liquor, and part is stayed in slag, make the comprehensive reutilization of precious metal become difficult.
Summary of the invention
The purpose of this invention is to provide a kind of method of extracting bismuth from copper bismuth concentrate, can extract bismuth from copper bismuth molybdenum ore more simply and effectively, make bismuth can be good at separating with other metal, production cost is low, and efficiency is high, safe and reliable, free from environmental pollution.
Realize that the technical scheme that above-mentioned purpose of the present invention is taked is: the mixed in hydrochloric acid agitation leach that is 28～32% by the copper bismuth molybdenum ore of bismuth-containing 4～14wt% and concentration makes pH remain on 0.3～0.6, then uses CaCO
3as neutralizing agent, leach liquor is stirred to heavy bismuth, throw out enters next step ore dressing or smelts flow process and obtain chlorine oxygen bismuth and valuable metal, and heavy bismuth liquid carries out iron removal by oxidation and sulfuric acid deliming successively, and the scavenging solution obtained returns to the leaching operation and recycles.
The technical scheme that the present invention further takes is: 1. the leaching liquid-solid ratio of copper bismuth molybdenum ore and hydrochloric acid is 2.7～3.3:1ml/g, and hydrochloric acid adds in the dropping mode, passes into pneumatic blending reaction 4～6 hours; 2. leach liquor first adopts raw ore to carry out pre-neutralization, during pre-neutralization, keep the pH value to be controlled at 1.2～1.5, pre-neutralization can effectively utilize the residual acid of liquid after Leaching in Hydrochloric Acid, reduce the alkalescence of raw ore, improve the pH value of solution, the consumption of minimizing neutralizing agent in next step heavy bismuth process, the quality of raising chlorine oxygen bismuth; 3. the leach liquor after pre-neutralization starts heavy bismuth again, and initially heavy bismuth pH>=1.8, control pH=3.0 when heavy bismuth completes; 4. heavy bismuth liquid CaCO
3for neutralizing agent regulator solution pH carries out the deironing purification 3.3～3.7, scavenging solution reaches iron content 5～8g/L and gets final product.
Technical scheme of the present invention also comprises that 1. copper bismuth molybdenum ore should be crushed to granularity 180～220 orders; 2. whole leaching and in and operation all remain under normal temperature, normal pressure and carry out; 3. during Han Tie in liquid after heavy bismuth<=8g/L, no longer carry out above-mentioned deironing and deliming operation, directly turn back to and leach operation and use.
the invention has the beneficial effects as follows: by bismuth-containing, higher copper bismuth molybdenum ore extracts bismuth by leaching at normal temperatures and pressures with solution, and the liquid after leaching is regulated pH value after by pre-treatment and sunk bismuth acquisition chlorine oxygen bismuth product.Slag enters beneficiation flowsheet or smelts flow process.Its technique is simple, and flow process is short, and solution can recycle, does not have waste water to discharge.Do not use chlorine oxidation Fe(II in solution) regeneration Fe(III).So production cost is low, efficiency is high, safe and reliable, free from environmental pollution.Can avoid the wet processing long flow path, reagent dosage is large, leaches poor selectivity, a large amount of strippings of impurity, and the valuable metals such as gold and silver disperse, and part enters leach liquor, and part enters the problems such as slag, comprehensive reutilization difficulty.Effectively bismuth is extracted from the copper bismuth mineral, polymetallic ore is effectively separated, improved productivity effect.
The accompanying drawing explanation
Fig. 1 is principle process flow sheet of the present invention.
Specific embodiments
embodiment 1
The copper bismuth molybdenum ore composition of bismuth-containing: Bi 9.69%, and Cu 0.75%, Fe24.14 %, and Ca10.16%, Mo0.654%, be milled to 180 purpose granularities.
In the situation of normal temperature and pressure blowing air, the hydrochloric acid soln that is 28% by the concentration of preparation joins in container, then copper bismuth molybdenum ore is added in container and stirs 6 hours, and adds hydrochloric acid in the dropping mode, makes pH remain on 0.3, obtains leach liquor.According to the bismuth-containing amount in liquid, use CaCO
3as neutralizing agent, leach liquor is stirred to heavy bismuth.Liquid after the heavy bismuth of filtration, the leached mud obtained is dried, and heavy bismuth liquid carries out iron removal by oxidation and sulfuric acid deliming successively, and the scavenging solution obtained returns to the leaching operation and recycles.Leached mud is 0.25wt% containing Bi, and leaching yield is 95.2%.
embodiment 2
The copper bismuth molybdenum ore composition Bi 5.28% of bismuth-containing, Cu0.45 %, Fe 18.24%, and Ca 8.25%, and Mo 0.542%, is milled to 200 purpose granularities.
In the situation of normal temperature and pressure blowing air, the hydrochloric acid soln that is 31% by the concentration of preparation joins in container, then copper bismuth molybdenum ore is added in container and stirs 5 hours, and adds hydrochloric acid in the dropping mode, makes pH remain on 0.5, obtains leach liquor.According to the bismuth-containing amount in liquid, use CaCO
3as neutralizing agent, leach liquor is stirred to heavy bismuth.Liquid after the heavy bismuth of filtration, the leached mud obtained is dried, and heavy bismuth liquid carries out iron removal by oxidation and sulfuric acid deliming successively, and the scavenging solution obtained returns to the leaching operation and recycles.Leached mud is 0.24wt% containing Bi, and leaching yield is 94.9%.
embodiment 3
The copper bismuth molybdenum ore composition of bismuth-containing: Bi 13.62%, and Cu 0.84%, and Fe 23.15%, and Ca 9.6%, and Mo 0.58%, is milled to 220 purpose granularities.
In the situation of normal temperature and pressure blowing air, the hydrochloric acid soln that is 32% by the concentration of preparation joins in container, then copper bismuth molybdenum ore is added in container and stirs 4 hours, and adds hydrochloric acid in the dropping mode, makes pH remain on 0.6, obtains leach liquor.According to the bismuth-containing amount in liquid, use CaCO
3as neutralizing agent, leach liquor is stirred to heavy bismuth.Liquid after the heavy bismuth of filtration, the leached mud obtained is dried, and heavy bismuth liquid carries out iron removal by oxidation and sulfuric acid deliming successively, and the scavenging solution obtained returns to the leaching operation and recycles.Leached mud is 0.28wt% containing Bi, and leaching yield is 95.8%.
Claims (3)
1. a method of extracting bismuth from the copper bismuth mineral, is characterized in that: by the copper bismuth molybdenum ore of bismuth-containing 4～14wt% and the mixed in hydrochloric acid agitation leach of concentration 28～32%, make pH remain on 0.3～0.6, then use CaCO
3as neutralizing agent, leach liquor is stirred to heavy bismuth, throw out enters next step ore dressing or smelts flow process and obtain chlorine oxygen bismuth and valuable metal, and heavy bismuth liquid carries out iron removal by oxidation and sulfuric acid deliming successively, and the scavenging solution obtained returns to the leaching operation and recycles.
2. the method for extracting bismuth from the copper bismuth mineral according to claim 1, it is characterized in that: 1. the leaching liquid-solid ratio of copper bismuth molybdenum ore and hydrochloric acid is 2.7～3.3:1ml/g, and hydrochloric acid adds in the dropping mode, passes into pneumatic blending and reacts 4～6 hours; 2. leach liquor first adopts raw ore to carry out pre-neutralization, during pre-neutralization, keeps the pH value to be controlled at 1.2～1.5; 3. the leach liquor after pre-neutralization starts heavy bismuth again, and initially heavy bismuth pH>=1.8, control pH=3.0 when heavy bismuth completes; 4. heavy bismuth liquid CaCO
3for neutralizing agent regulator solution pH carries out the deironing purification 3.3～3.7, scavenging solution reaches iron content 5～8g/L and gets final product.
3. the method for extracting bismuth from the copper bismuth mineral according to claim 2, it is characterized in that: 1. copper bismuth molybdenum ore should be crushed to granularity 180～220 orders; 2. whole leaching and in and operation all remain under normal temperature, normal pressure and carry out; 3. during Han Tie in liquid after heavy bismuth<=8g/L, directly turn back to and leach operation and use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310372427.XA CN103484694A (en) | 2013-08-25 | 2013-08-25 | Method for extracting bismuth from copper-bismuth concentrate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310372427.XA CN103484694A (en) | 2013-08-25 | 2013-08-25 | Method for extracting bismuth from copper-bismuth concentrate |
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| CN103484694A true CN103484694A (en) | 2014-01-01 |
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| CN201310372427.XA Pending CN103484694A (en) | 2013-08-25 | 2013-08-25 | Method for extracting bismuth from copper-bismuth concentrate |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108441629A (en) * | 2018-04-20 | 2018-08-24 | 中南大学 | A kind of method that acid decomposition Scheelite-Wolframite Mixed Mine prepares tungsten oxide and tungsten powder |
| CN108559841A (en) * | 2018-04-20 | 2018-09-21 | 中南大学 | A kind of method that acid decomposition Scheelite-Wolframite Mixed Mine prepares tungsten product |
| CN108611503A (en) * | 2018-04-20 | 2018-10-02 | 中南大学 | A kind of method that oxygen pressure decomposes wolframite and prepares tungsten oxide and tungsten powder |
| CN108642276A (en) * | 2018-04-20 | 2018-10-12 | 中南大学 | A kind of method that acid decomposition scheelite prepares tungsten oxide and tungsten powder |
| CN108640156A (en) * | 2018-04-20 | 2018-10-12 | 中南大学 | A method of preparing tungsten oxide and tungsten powder from scheelite |
| CN108796220A (en) * | 2018-07-04 | 2018-11-13 | 湖南工业大学 | A kind of method of extraction-vulcanization phase inversion separation of Bismuth and iron in bismuth iron mixed solution |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108441629A (en) * | 2018-04-20 | 2018-08-24 | 中南大学 | A kind of method that acid decomposition Scheelite-Wolframite Mixed Mine prepares tungsten oxide and tungsten powder |
| CN108559841A (en) * | 2018-04-20 | 2018-09-21 | 中南大学 | A kind of method that acid decomposition Scheelite-Wolframite Mixed Mine prepares tungsten product |
| CN108611503A (en) * | 2018-04-20 | 2018-10-02 | 中南大学 | A kind of method that oxygen pressure decomposes wolframite and prepares tungsten oxide and tungsten powder |
| CN108642276A (en) * | 2018-04-20 | 2018-10-12 | 中南大学 | A kind of method that acid decomposition scheelite prepares tungsten oxide and tungsten powder |
| CN108640156A (en) * | 2018-04-20 | 2018-10-12 | 中南大学 | A method of preparing tungsten oxide and tungsten powder from scheelite |
| CN108796220A (en) * | 2018-07-04 | 2018-11-13 | 湖南工业大学 | A kind of method of extraction-vulcanization phase inversion separation of Bismuth and iron in bismuth iron mixed solution |
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