CN104195277A - Method for recovering and reducing iron powder from smelting slag of lead zinc ores - Google Patents
Method for recovering and reducing iron powder from smelting slag of lead zinc ores Download PDFInfo
- Publication number
- CN104195277A CN104195277A CN201410457262.0A CN201410457262A CN104195277A CN 104195277 A CN104195277 A CN 104195277A CN 201410457262 A CN201410457262 A CN 201410457262A CN 104195277 A CN104195277 A CN 104195277A
- Authority
- CN
- China
- Prior art keywords
- iron powder
- metallurgical slag
- zinc ore
- plumbous zinc
- reclaims
- 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.)
- Granted
Links
Abstract
The invention relates to a method for recovering and reducing iron powder from smelting slag of lead zinc ores. The method comprises the following steps: by using smelting slag of lead zinc ores as a raw material, directly reducing the smelting slag of lead zinc ores by using kiln equipment by virtue of a melting agent and a reducing agent, wherein the content of TFe is 1-40%; and carrying out water quenching on the reduced iron powder and magnetic separation on iron residues to obtain the iron powder. The melting agent is prepared from the following components in percentage by weight: 0-5% of CaO, 1-4% of fluorite, 0-0.5% of sodium carbonate, 0-1% of sodium sulfate, 0-4% of SiO2 and 1-3% of potassium chlorate, and the reducing agent is selected from one or a mixture of one or more of coal, coke, petroleum coke and semi coke. The addition amounts of the melting agent and the reducing agent are respectively 1-20wt% of the smelting slag of lead zinc ores. The method provided by the invention is reasonable in design and simple and convenient to operate. The smelting slag of lead zinc ores can be effectively utilized, and the smelting slag of lead zinc ores is harmlessly treated while the iron powder is recycled, so that the method is an energy-saving and environment-friendly recovery process.
Description
Technical field
The present invention relates to a kind of method that reclaims reduced iron powder from metallurgical slag, particularly a kind of method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag.
Background technology
China is World Steel output big country, and production capacity accounts for 46% of global crude steel output.But China's iron ore deposit basic characteristics are that lean ore is many, rich ore is few, national iron ore deposit in 2006 finds out that resource reserve is 60,700,000,000 tons, a large amount of iron ores still need external import, come iron ore imports amount constantly soaring year after year, within 2013, China's iron ore accumulative total import volume reaches 14.5 hundred million t, increases on year-on-year basis by 1.3 hundred million t, increases by 9.9%, seriously restricted the development of iron and steel enterprise, to depending on unduly of external iron ore deposit, made the steel industry of China pay high cost.
The application of plumbous zinc is very extensive, is the indispensable metallic substance of national economy.China is maximum in the world lead bullion producing country and country of consumption.2000 to 2013 the zinc abilities of smelting increase progressively every year 11.4%, 2013 year and reach 5,000,000 tons of left and right.Plumbous cadmia is the solid slag producing in the process in lead-zinc smelting ore deposit, results from the plumbous pyrometallurgical smelting stage, common iron content 20 ~ 30% and other trace metals in this solid metallurgical slag.Recycling to iron in plumbous zinc ore metallurgical slag meets national steel industry growth requirement, can also carry out harmless treatment to metallurgical slag simultaneously.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, provides that a kind of method is simple and convenient, recovering effect good, the method for reduced iron powder that reclaims from plumbous zinc ore metallurgical slag of efficent use of resources.
Technical problem to be solved by this invention is to realize by following technical scheme.The present invention is a kind of method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag, be characterized in, the raw material using is plumbous zinc ore metallurgical slag, its TFe content is 1 ~ 40%, use molten minute agent and reductive agent, use furnace equipment to carry out direct-reduction to plumbous zinc ore metallurgical slag, the iron powder after reduction, through shrend, the separated scum of magnetic separation, obtains iron powder; The mass percent of described molten minute agent consists of: CaO 0 ~ 5%; Fluorite 1 ~ 4%; Sodium carbonate 0 ~ 0.5%; Sodium sulfate 0 ~ 1%; SiO
20 ~ 4%; Potcrate 1 ~ 3%; Described reductive agent is selected from: the mixture of one or several compositions in coal, coke, refinery coke, blue charcoal; The add-on of an agent in molten minute, reductive agent be respectively plumbous zinc ore metallurgical slag weight 1 ~ 20%.
In the technical scheme of the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag of the present invention, further preferred technical scheme or technical characterictic are:
1, the preferred mass per-cent of described molten minute agent consists of: CaO 0.1 ~ 5%; Fluorite 1 ~ 4%; Sodium carbonate 0.05 ~ 0.5%; Sodium sulfate 0.05 ~ 1%; SiO
20.1 ~ 4%; Potcrate 1 ~ 3%.Further the mass percent of preferred molten minute agent consists of: CaO 1 ~ 3%; Fluorite 2 ~ 3%; Sodium carbonate 0.1 ~ 0.3%; Sodium sulfate 0.2 ~ 0.6%; SiO
21 ~ 2%; Potcrate 1.5 ~ 2.0%.The mass percent of most preferred molten minute agent consists of: CaO 2%; Fluorite 2.5%; Sodium carbonate 0.2%; Sodium sulfate 0.4%; SiO
21.5%; Potcrate 1.8%.
2. the reduction temperature described in is preferably: 500 ~ 2000 ℃.Further preferred reduction temperature is: 800 ~ 1200 ℃.The preferred recovery time is: 0.5 ~ 5 hour.
3. the furnace equipment described in can be used: tunnel furnace, rotary kiln or fuming kiln or other conventional reduced form kiln furnace apparatus.
4. the iron powder after reduction can be carried out to briquetting and use as conversion pig, the grain slag after shrend, magnetic separation separation is used as cement material or material of construction, and it has advantages of high heating value and intensity.
5. the agent in molten minute described in, the add-on of reductive agent be preferably respectively plumbous zinc ore metallurgical slag weight 5 ~ 10%.
Compared with prior art, extracting method of the present invention is reasonable in design, easy and simple to handle.Can effectively utilize plumbous zinc ore metallurgical slag, when recycling iron powder, also plumbous zinc ore metallurgical slag carried out to innoxious processing, be a kind of recovery process of energy-conserving and environment-protective.
Embodiment
Below further describe concrete technical scheme of the present invention, so that those skilled in the art understands the present invention further, and do not form the restriction to its right.
Embodiment 1, a kind of method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag, the raw material using is plumbous zinc ore metallurgical slag, its TFe content is 1 ~ 40%, use molten minute agent and reductive agent, use furnace equipment to carry out direct-reduction to plumbous zinc ore metallurgical slag, the iron powder after reduction, through shrend, the separated scum of magnetic separation, obtains iron powder; The mass percent of described molten minute agent consists of: fluorite 1 ~ 4%; Sodium carbonate 0.5 ~ 0.5%; Sodium sulfate 0.05 ~ 1%; SiO
20.1 ~ 4%; Potcrate 1 ~ 3%; Described reductive agent is selected from: the mixture of one or several compositions in coal, coke, refinery coke, blue charcoal; The add-on of an agent in molten minute, reductive agent be respectively plumbous zinc ore metallurgical slag weight 1 ~ 20%.
Embodiment 2, a kind of method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag, the raw material using is plumbous zinc ore metallurgical slag, its TFe content is 1 ~ 40%, use molten minute agent and reductive agent, use furnace equipment to carry out direct-reduction to plumbous zinc ore metallurgical slag, the iron powder after reduction, through shrend, the separated scum of magnetic separation, obtains iron powder; The mass percent of described molten minute agent consists of: fluorite 1 ~ 4%; Potcrate 1 ~ 3%; Described reductive agent is selected from: the mixture of one or several compositions in coal, coke, refinery coke, blue charcoal; The add-on of an agent in molten minute, reductive agent be respectively plumbous zinc ore metallurgical slag weight 1 ~ 20%.
Embodiment 3, a kind of method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag, the raw material using is plumbous zinc ore metallurgical slag, its TFe content is 1 ~ 40%, use molten minute agent and reductive agent, use furnace equipment to carry out direct-reduction to plumbous zinc ore metallurgical slag, the iron powder after reduction, through shrend, the separated scum of magnetic separation, obtains iron powder; The mass percent of described molten minute agent consists of: CaO 0.1 ~ 5%; Fluorite 1 ~ 4%; Sodium sulfate 0.05 ~ 1%; SiO
20.1 ~ 4%; Potcrate 1 ~ 3%; Described reductive agent is selected from: the mixture of one or several compositions in coal, coke, refinery coke, blue charcoal; The add-on of an agent in molten minute, reductive agent be respectively plumbous zinc ore metallurgical slag weight 1 ~ 20%.
Embodiment 4, a kind of method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag, the raw material using is plumbous zinc ore metallurgical slag, its TFe content is 1 ~ 40%, use molten minute agent and reductive agent, use furnace equipment to carry out direct-reduction to plumbous zinc ore metallurgical slag, the iron powder after reduction, through shrend, the separated scum of magnetic separation, obtains iron powder; The mass percent of described molten minute agent consists of: CaO 0.1 ~ 5%; Fluorite 1 ~ 4%; Sodium carbonate 0.05 ~ 0.5%; Sodium sulfate 0.05 ~ 1%; SiO
20.1 ~ 4%; Potcrate 1 ~ 3%; Described reductive agent is selected from: the mixture of one or several compositions in coal, coke, refinery coke, blue charcoal; The add-on of an agent in molten minute, reductive agent be respectively plumbous zinc ore metallurgical slag weight 1 ~ 20%.
Embodiment 5, a kind of method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag, the raw material using is plumbous zinc ore metallurgical slag, its TFe content is 1 ~ 40%, use molten minute agent and reductive agent, use furnace equipment to carry out direct-reduction to plumbous zinc ore metallurgical slag, the iron powder after reduction, through shrend, the separated scum of magnetic separation, obtains iron powder; The mass percent of described molten minute agent consists of: CaO 1 ~ 3%; Fluorite 2 ~ 3%; Sodium carbonate 0.1 ~ 0.3%; Sodium sulfate 0.2 ~ 0.6%; SiO
21 ~ 2%; Potcrate 1.5 ~ 2.0%; Described reductive agent is selected from: the mixture of one or several compositions in coal, coke, refinery coke, blue charcoal; The add-on of an agent in molten minute, reductive agent be respectively plumbous zinc ore metallurgical slag weight 5 ~ 10%.
Embodiment 6, a kind of method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag, the raw material using is plumbous zinc ore metallurgical slag, its TFe content is 1 ~ 40%, use molten minute agent and reductive agent, use furnace equipment to carry out direct-reduction to plumbous zinc ore metallurgical slag, the iron powder after reduction, through shrend, the separated scum of magnetic separation, obtains iron powder; The mass percent of described molten minute agent consists of: CaO 2%; Fluorite 2.5%; Sodium carbonate 0.2%; Sodium sulfate 0.4%; SiO
21.5%; Potcrate 1.8%; Described reductive agent is selected from: the mixture of one or several compositions in coal, coke, refinery coke, blue charcoal; The add-on of an agent in molten minute, reductive agent be respectively plumbous zinc ore metallurgical slag weight 7%, 8%.
Embodiment 7, anyly in embodiment 1-6 from plumbous zinc ore metallurgical slag, reclaim in the method for reduced iron powder, and described reduction temperature is: 500 ~ 2000 ℃, and the recovery time: 0.5 ~ 5 hour.
Embodiment 8, anyly in embodiment 1-6 from plumbous zinc ore metallurgical slag, reclaim in the method for reduced iron powder, and described reduction temperature is: 800 ~ 1200 ℃, and the recovery time: 1 ~ 3 hour.
Embodiment 9, anyly in embodiment 1-6 from plumbous zinc ore metallurgical slag, reclaim in the method for reduced iron powder, and described reduction temperature is: 950 ℃, and the recovery time: 2 hours.Described furnace equipment is: tunnel furnace, rotary kiln or fuming kiln.Iron powder after reduction is carried out to briquetting and as conversion pig, use, the grain slag after shrend, magnetic separation separation is used as cement material or material of construction.
Embodiment 10, a kind of methods experiment one that reclaims reduced iron powder from plumbous zinc ore metallurgical slag:
Get the plumbous zinc ore metallurgical slag of 100Kg, composition is as follows:
| TFe | Al 2O 3 | CaO | MgO | SiO 2 |
| 26.50 | 7.47 | 14.6 | 2.49 | 21.5 |
By plumbous zinc ore metallurgical slag abrasive dust ,-200 order >=90%.Get again CaO4.8Kg, fluorite 1.2 Kg, sodium carbonate 0.6 Kg, sodium sulfate 1.2 Kg, SiO
24.8 Kg, Potcrate 2.4 Kg mix and form composite fluxing agent.The smelting ground-slag grinding, molten minute agent, 200 order pulverized anthracite 15Kg are fully mixed, pack in reduction tank, then at reduction tank lid last layer coal dust, be warming up to 1200 ℃, be incubated 4 hours, take out after being cooled to 60 ℃, as follows through the separated post analysis result of magnetic separation:
Reduzate result:
| Tfe | Mfe |
| 26.67 | 20.85 |
Magnetic Materials result:
| Tfe | Mfe |
| 85.85 | 72.43 |
Nonmagnetics result:
| Tfe | Mfe |
| 2.5 | 0.14 |
Embodiment 11, a kind of methods experiment two that reclaims reduced iron powder from plumbous zinc ore metallurgical slag:
Get the plumbous zinc ore metallurgical slag of 100Kg, composition is as follows:
| TFe | Al 2O 3 | CaO | MgO | SiO 2 |
| 30.50 | 5.40 | 12.8 | 2.19 | 20.65 |
By plumbous zinc ore metallurgical slag abrasive dust ,-100 order >=90%.Get again CaO4.8Kg, fluorite 1.2 Kg, sodium carbonate 0.6 Kg, sodium sulfate 1.2 Kg, SiO
24.8 Kg, Potcrate 2.4 Kg mix and form composite fluxing agent.The smelting ground-slag grinding, molten minute agent, the yellow coal dust 5Kg of 200 orders are fully mixed, first in reduction tank, spread the thick coal dust of 1mm, reinstall mixed metallurgical slag, again at reduction tank lid last layer coal dust, be warming up to 1230 ℃, be incubated 2 hours, take out after being cooled to 60 ℃, as follows through the separated post analysis result of magnetic separation:
Reduzate result:
| TFe | MFe |
| 31.56 | 28.95 |
Magnetic Materials result:
| TFe | MFe |
| 89.85 | 83.23 |
Nonmagnetics result:
| TFe | MFe |
| 3.9 | 0.24 |
Claims (10)
1. a method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag, it is characterized in that, the raw material using is plumbous zinc ore metallurgical slag, its TFe content is 1 ~ 40%, use molten minute agent and reductive agent, use furnace equipment to carry out direct-reduction to plumbous zinc ore metallurgical slag, the iron powder after reduction, through shrend, the separated scum of magnetic separation, obtains iron powder; The mass percent of described molten minute agent consists of: CaO 0 ~ 5%; Fluorite 1 ~ 4%; Sodium carbonate 0 ~ 0.5%; Sodium sulfate 0 ~ 1%; SiO
20 ~ 4%; Potcrate 1 ~ 3%; Described reductive agent is selected from: the mixture of one or several compositions in coal, coke, refinery coke, blue charcoal; The add-on of an agent in molten minute, reductive agent be respectively plumbous zinc ore metallurgical slag weight 1 ~ 20%.
2. the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag according to claim 1, is characterized in that, the mass percent of described molten minute agent consists of: CaO 0.1 ~ 5%; Fluorite 1 ~ 4%; Sodium carbonate 0.05 ~ 0.5%; Sodium sulfate 0.05 ~ 1%; SiO
20.1 ~ 4%; Potcrate 1 ~ 3%.
3. the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag according to claim 1, is characterized in that, the mass percent of described molten minute agent consists of: CaO 1 ~ 3%; Fluorite 2 ~ 3%; Sodium carbonate 0.1 ~ 0.3%; Sodium sulfate 0.2 ~ 0.6%; SiO
21 ~ 2%; Potcrate 1.5 ~ 2.0%.
4. the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag according to claim 1, is characterized in that, the mass percent of described molten minute agent consists of: CaO 2%; Fluorite 2.5%; Sodium carbonate 0.2%; Sodium sulfate 0.4%; SiO
21.5%; Potcrate 1.8%.
5. the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag according to claim 1, is characterized in that, described reduction temperature is: 500 ~ 2000 ℃.
6. the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag according to claim 1, is characterized in that, described reduction temperature is: 800 ~ 1200 ℃.
7. the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag according to claim 1, is characterized in that the described recovery time: 0.5 ~ 5 hour.
8. the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag according to claim 1, is characterized in that, described furnace equipment is: tunnel furnace, rotary kiln or fuming kiln.
9. the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag according to claim 1, is characterized in that, the iron powder after reduction is carried out to briquetting and as conversion pig, use, and the grain slag after shrend, magnetic separation separation is used as cement material or material of construction.
10. the method that reclaims reduced iron powder from plumbous zinc ore metallurgical slag according to claim 1, is characterized in that, the add-on of a described molten minute agent, reductive agent be respectively plumbous zinc ore metallurgical slag weight 5 ~ 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410457262.0A CN104195277B (en) | 2014-09-10 | 2014-09-10 | The method reclaiming reduced iron powder from Pb-Zn deposits metallurgical slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410457262.0A CN104195277B (en) | 2014-09-10 | 2014-09-10 | The method reclaiming reduced iron powder from Pb-Zn deposits metallurgical slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104195277A true CN104195277A (en) | 2014-12-10 |
| CN104195277B CN104195277B (en) | 2016-06-15 |
Family
ID=52080639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410457262.0A Expired - Fee Related CN104195277B (en) | 2014-09-10 | 2014-09-10 | The method reclaiming reduced iron powder from Pb-Zn deposits metallurgical slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104195277B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939572A (en) * | 2019-12-11 | 2021-06-11 | 桂阳县皓钰新材料有限公司 | Process for treating iron slag of steel plant by tunnel kiln |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787407A (en) * | 2010-02-02 | 2010-07-28 | 昆明理工大学 | Method for reducing and extracting copper smelting waste slag through microwave carbon heating |
| CN102094095A (en) * | 2011-01-29 | 2011-06-15 | 沈阳博联特熔融还原科技有限公司 | Method for quickly separating and directly reducing iron slag |
| CN102896039A (en) * | 2012-10-17 | 2013-01-30 | 衡南县旺宏粉末金属材料科技有限公司 | Preparation method for refining reduced iron from second zinc oxide industrial residues |
| CN103757170A (en) * | 2013-12-13 | 2014-04-30 | 金川集团股份有限公司 | Method for injection reduction extraction of iron from nickel smelting furnace slag |
-
2014
- 2014-09-10 CN CN201410457262.0A patent/CN104195277B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787407A (en) * | 2010-02-02 | 2010-07-28 | 昆明理工大学 | Method for reducing and extracting copper smelting waste slag through microwave carbon heating |
| CN102094095A (en) * | 2011-01-29 | 2011-06-15 | 沈阳博联特熔融还原科技有限公司 | Method for quickly separating and directly reducing iron slag |
| CN102896039A (en) * | 2012-10-17 | 2013-01-30 | 衡南县旺宏粉末金属材料科技有限公司 | Preparation method for refining reduced iron from second zinc oxide industrial residues |
| CN103757170A (en) * | 2013-12-13 | 2014-04-30 | 金川集团股份有限公司 | Method for injection reduction extraction of iron from nickel smelting furnace slag |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939572A (en) * | 2019-12-11 | 2021-06-11 | 桂阳县皓钰新材料有限公司 | Process for treating iron slag of steel plant by tunnel kiln |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104195277B (en) | 2016-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108658483B (en) | Method for preparing auxiliary cementing material by reducing and recycling iron and secondary slag through steel slag | |
| CN101353708B (en) | Nickel iron smelting process with nickel oxide ore and stainless steel production wastes as raw materials | |
| CN102839278B (en) | Method for extracting iron from iron mine tailings through strong magnetic, pre-concentration deep reduction | |
| CN101787407B (en) | Method for reducing and extracting copper smelting waste slag through microwave carbon heating | |
| CN101418389B (en) | Method for directly reducing grain nickel iron in rotary kiln by using laterite nickle mine | |
| CN102534194A (en) | Method for producing ferronickel from laterite-nickel ore | |
| CN103233114A (en) | Method for producing nickel/ferrum from nickel laterite ores | |
| CN112111660B (en) | Method for enriching lithium from lithium ore and preparing ferro-silicon alloy and recycling aluminum oxide | |
| CN102373329A (en) | Method for gathering nickel and iron from laterite-nickel ores | |
| CN101967571B (en) | Method for using red-soil nickel ore to produce nickel-iron alloy in tunnel kiln-electric furnace | |
| CN103103310A (en) | Vanadium extraction cold pressing block and preparation method and applications thereof and vanadium extraction method | |
| CN101418388B (en) | Process for producing nickel iron in rotary kiln-blast furnace by using laterite nickle mine | |
| CN103409636A (en) | Comprehensive recovery method of waste CRT (Cathode Ray Tube) cone glass | |
| CN106673682A (en) | Method for producing iron alloy and refractory material by utilizing solid wastes | |
| CN102268502B (en) | Spongy iron preparation method by smelting refractory iron ore (slag) with reduction rotary kiln | |
| CN102344981A (en) | Separation and direct reduction process of iron and boron in boron-containing iron ore concentrate | |
| CN102643976B (en) | Composite additive for producing nickel-iron particles by using laterite, and application method thereof | |
| CN104946840A (en) | Method for preparing direct reduction iron and gelation materials through iron-contained nonferrous metallurgical slag | |
| CN103924089A (en) | Method of melting stainless steel dust, slag and Cr-containing sludge | |
| CN110453025A (en) | A kind of method that high calcium v-bearing steel slag smelts the rich vanadium pig iron | |
| CN103215437A (en) | Method for producing beaded iron by using nickel slag, blast furnace gas ash and steel OG mud | |
| CN103602773B (en) | Method for comprehensive utilization of paigeite through direct reduction-electric furnace melting separation of rotary hearth furnace | |
| CN104195277B (en) | The method reclaiming reduced iron powder from Pb-Zn deposits metallurgical slag | |
| CN103695634B (en) | A kind of low-grade laterite nickel ore semi-molten state produces the method for Rhometal | |
| CN102605174A (en) | Process method for respectively recovering nickel and iron from low-nickel high-iron laterite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160615 Termination date: 20160910 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |