CN103725870A - Method for preventing ring forming in process of roasting decomposing of rare-earth ore concentrate by utilizing liquid caustic soda - Google Patents
Method for preventing ring forming in process of roasting decomposing of rare-earth ore concentrate by utilizing liquid caustic soda Download PDFInfo
- Publication number
- CN103725870A CN103725870A CN201410024380.2A CN201410024380A CN103725870A CN 103725870 A CN103725870 A CN 103725870A CN 201410024380 A CN201410024380 A CN 201410024380A CN 103725870 A CN103725870 A CN 103725870A
- Authority
- CN
- China
- Prior art keywords
- ore concentrate
- rare
- earth ore
- roasting
- rare earth
- 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 preventing ring forming in a process of roasting decomposing of rare-earth ore concentrate by utilizing liquid caustic soda. The method is characterized by comprising the following steps of preparing a sodium hydroxide solution, and adding a swelling agent into the sodium hydroxide solution, wherein the addition quantity of the swelling agent is 0.5 to 10 percent of the mass of the rare-earth ore concentrate; and mixing the NaOH solution with the swelling agent with the rare-earth ore concentrate to form slurry, and continuously feeding the slurry into a rotary kiln to be roasted and decomposed. The method has the advantages that when the rare-earth ore concentrate is roasted and decomposed by the liquid caustic soda, the decomposed roasted ore is in powder form, no ring is formed inside the rotary kiln, and the roasting decomposition can be continuously carried out. The defects of an existing mixed rare-earth ore concentrate decomposing process (acid method and alkaline method) can be fundamentally overcome, the waste gas containing sulfur and fluorine and the waste water containing ammonium and nitrogen can be avoided, the utilization rate of thorium, fluorine and phosphorus resource can be increased, the continuous production of the liquid caustic soda decomposing process can be realized, the environmental pollution caused by waste gas, waste water and waste solid in the rare-earth smelting process can be prevented, and the clean production can be realized.
Description
Technical field
The present invention relates to a kind of method that liquid alkali roasting decomposition rare earth ore concentrate prevents ring formation, belong to rare earth metallurgy field.
Background technology
The rare earth resources in packet header is richly endowed by nature, and Baotou rare earth ore concentrate accounts for China and smelts the more than 60% of rare earth ore concentrate.The technique of extracting mishmetal from Baotou rare earth ore concentrate is mainly concentrated sulfuric acid roasting technique.There is following some insoluble environmental protection defect in this technique: (1) baking tail gases is the sour gas that contains a large amount of sulphur and fluorine, adopt the method processing of water spray-absorption, but emission is difficult to reach national relevant emission standards.Simultaneously, because spray liquid is the mixing acid of sulfuric acid, silicofluoric acid and hydrofluoric acid, be difficult to recycle, can only adopt the processing of lime neutralization method, not only in and the quantity of slag large, and easily cause secondary pollution.(2) thorium element combines in leached mud, this leaching quantity of slag is very large, accounts for the more than 70% of rare earth ore concentrate amount, and radioactive intensity exceedes national low-activity slag standard, it is preserved and processes quite difficulty, and thorium is difficult to be recycled owing to generating thorium pyrophosphate in roasting process as a kind of resource.For solving above-mentioned environmental problem and comprehensive utilization of resources problem, patent of invention " a kind of liquid alkali roasting decomposition extraction process of mixed rare earth concentrates " (ZL 2,010 1 0145840.9) has proposed a kind of new decomposition technique, rare earth ore concentrate is mixed with sodium hydroxide solution, Roasting Decomposition in rotary kiln, the resources such as the comprehensive Extraction of rare earth of mineral, thorium, fluorine, phosphorus and calcium after decomposition, technological process is without waste gas, waste residue.The key of this technology is the Roasting Decomposition process in rotary kiln after rare earth ore concentrate mixes with sodium hydroxide solution, due to slip enter rotary kiln after moisture evaporate very soon, rare-earth mineral and sodium hydroxide form lump ring formation in kiln hood low-temperature zone, the lump hardness that rare-earth mineral and sodium hydroxide ring formation form is very high, conventional blade structure design rotary kiln cannot scrape off the ring formation of formation, and roasting cannot be carried out continuously.
Rotary kiln is the important roasting apparatus of field of metallurgy, in rare earth metallurgy process, be mainly used in the decomposition course of rare-earth mineral, at iron and steel and other field of metallurgy, also there is similar ring formation problem to exist, the research emphasis that solves ring formation problem at present is all improved or transforms on equipment, if " a kind of processing method of preveting kiln ringing " (CN 1032154444 A) are the methods of ring formation while solving sulfuric acid of rare-earth concentrate high-temperature roasting, low-temperature zone at rotary kiln arranges back material hole, in high temperature section, anti-material hole is set, back material hole is connected with carrier pipe in rotary kiln outside with anti-material hole, making the roasted ore part of high temperature section return to low-temperature zone again participates in roasting and solves ring formation problem.And " a kind of rotary kiln capable of preventing rings from forming and roasting method " (CN 102494535 A) disclose the interior equipment spirane structure of a kind of rotary kiln and use abrasive to solve the method for ring formation, " a kind of method that prevents that rotary kiln sintered circle from forming " (CN 102706141 A) have announced a kind of by regulating combustion air flow and gas flow, make the position method that rule moves in rotary kiln of ring formation solve ring formation problem.The ring formation problem that aforesaid method decomposes for rare-earth mineral liquid alkali roasting is all inapplicable.
Summary of the invention
The object of the invention is for solve liquid alkali roasting decompose during rare-earth mineral in rotary kiln because of ring formation can not quantity-produced problem, make the cleaning procedure of liquid alkali roasting can in existing rotary kiln, carry out continuously Roasting Decomposition, provide a kind of liquid alkali roasting decomposition rare earth ore concentrate to prevent the method for ring formation, present method redesigns rare earth ore concentrate liquid alkali roasting decomposition extraction process on the technique basis of patent of invention " a kind of liquid alkali roasting decomposition extraction process of mixed rare earth concentrates ZL 2,010 1 0145840.9 ", can make liquid alkali roasting decomposition technique realize serialization industrial production.
For realizing object of the present invention, a kind of liquid alkali roasting decomposition rare earth ore concentrate provided by the invention prevents the method for ring formation, comprises following process:
Sodium hydroxide is configured to solution, in sodium hydroxide solution, add raising agent, the add-on of raising agent is the 0.5%-10% of rare earth ore concentrate quality, uses the NaOH solution that has added raising agent to mix and size mixing with rare earth ore concentrate, and then slip enters rotary kiln baking decomposition continuously.
Raising agent described in described process is one or more the combination in sodium laurylsulfonate, Sodium dodecylbenzene sulfonate, sodium lauryl sulphate.Those skilled in the art can know other can all can be used for implementing the present invention as the anion surfactant class of raising agent, herein for preferential select unrestricted.
The preferred add-on of the raising agent described in said process is the 1%-5% of rare earth ore concentrate quality.
Roasted ore after decomposition is powdery, and ring formation not in rotary kiln, can carry out Roasting Decomposition continuously.
Advantage of the present invention is: adopt method of the present invention, can make liquid alkali roasting decompose during rare earth ore concentrate, the roasted ore after decomposition is powdery, and ring formation not in rotary kiln, can carry out Roasting Decomposition continuously.Technical scheme provided by the invention has fundamentally solved the deficiency of current mixed rare earth concentrates decomposition technique (acid system and alkaline process), avoided the generation of sulfur-bearing, waste gas containing fluoride and nitrogen-containing wastewater, improved the utilization ratio of thorium, fluorine, phosphor resource, having realized the serialization of liquid alkali roasting decomposition technique produces, from source, solved " three wastes " pollution to environment rare-earth smelting process, realized and cleaned production.
Embodiment
Below in conjunction with embodiment, explain in detail technical scheme provided by the present invention, but not as the restriction to the claims in the present invention protection domain.
Embodiment 1:
Get 25kg sodium hydroxide and be made into 70wt% solution, in solution, add 0.25Kg sodium laurylsulfonate, add 25kg mixed rare earth concentrates (REO 57wt%), after mixing, in rotary kiln, be back to back, kiln residence time 1.5 ~ 2.0 hours, 180 ℃ of rotary kiln inlet temperatures, 260 ℃ of kiln temperatures, 230 ℃ of temperature outs.Roasted ore gray powder shaped after roasting, enters in the aggregate bin of rotary kiln outlet rare-earth mineral rate of decomposition 98.6% automatically.
Embodiment 2:
Get 25kg sodium hydroxide and be made into 70wt% solution, in solution, add 0.75Kg Sodium dodecylbenzene sulfonate, add 25kg mixed rare earth concentrates (REO 50wt%), after mixing, in rotary kiln, be back to back, kiln residence time 1.5 ~ 2.0 hours, 180 ℃ of rotary kiln inlet temperatures, 370 ℃ of kiln temperatures, 330 ℃ of temperature outs.Roasted ore after roasting is grey black powder shaped, automatically enters in the aggregate bin of rotary kiln outlet rare-earth mineral rate of decomposition 97.0%.
Embodiment 3:
Get 25kg sodium hydroxide and be made into 70wt% solution, in solution, add 1.25kg sodium lauryl sulphate, add 25kg mixed rare earth concentrates (REO 50wt%), after mixing, in rotary kiln, be back to back, kiln residence time 1.5 ~ 2.0 hours, 180 ℃ of rotary kiln inlet temperatures, 420 ℃ of kiln temperatures, 330 ℃ of temperature outs.Roasted ore after roasting is look powder shaped darkly, automatically enters in the aggregate bin of rotary kiln outlet rare-earth mineral rate of decomposition 97.5%.
Claims (3)
1. a liquid alkali roasting decomposes rare earth ore concentrate and prevents the method for ring formation, it is characterized in that: sodium hydroxide is configured to solution, in sodium hydroxide solution, add raising agent, the add-on of raising agent is the 0.5%-10% of rare earth ore concentrate quality, mix and size mixing with rare earth ore concentrate with the NaOH solution that has added raising agent, then slip enters continuously rotary kiln baking and decomposes.
2. liquid alkali roasting according to claim 1 decomposes rare earth ore concentrate and prevents the method for ring formation, it is characterized in that: the raising agent described in described process is one or more the combination in sodium laurylsulfonate, Sodium dodecylbenzene sulfonate, sodium lauryl sulphate.
3. liquid alkali roasting decomposition rare earth ore concentrate according to claim 1 and 2 prevents the method for ring formation, it is characterized in that: the add-on of described raising agent is the 1%-5% of rare earth ore concentrate quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024380.2A CN103725870B (en) | 2014-01-20 | 2014-01-20 | A kind of liquid alkali roasting decomposes the method that rare earth ore concentrate prevents ring formation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024380.2A CN103725870B (en) | 2014-01-20 | 2014-01-20 | A kind of liquid alkali roasting decomposes the method that rare earth ore concentrate prevents ring formation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103725870A true CN103725870A (en) | 2014-04-16 |
| CN103725870B CN103725870B (en) | 2016-04-06 |
Family
ID=50450160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410024380.2A Active CN103725870B (en) | 2014-01-20 | 2014-01-20 | A kind of liquid alkali roasting decomposes the method that rare earth ore concentrate prevents ring formation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103725870B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1103111A (en) * | 1993-11-26 | 1995-05-31 | 北京有色金属研究总院 | Making rare-earth material liquid from bastnae site |
| JP2002241820A (en) * | 2001-02-20 | 2002-08-28 | Sumitomo Heavy Ind Ltd | Smelting reduction method for iron oxide using rotary kiln |
| US20040112834A1 (en) * | 2002-04-03 | 2004-06-17 | Libardo Perez | Mineral ore slurry viscosity modification method |
| CN101824554A (en) * | 2010-03-12 | 2010-09-08 | 瑞科稀土冶金及功能材料国家工程研究中心有限公司 | Liquid alkali roasting decomposition extraction process of mixed rare earth concentrates |
| CN102409164A (en) * | 2011-12-02 | 2012-04-11 | 中国科学院过程工程研究所 | Anti-caking roasting method of mixed rare earth ore |
-
2014
- 2014-01-20 CN CN201410024380.2A patent/CN103725870B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1103111A (en) * | 1993-11-26 | 1995-05-31 | 北京有色金属研究总院 | Making rare-earth material liquid from bastnae site |
| JP2002241820A (en) * | 2001-02-20 | 2002-08-28 | Sumitomo Heavy Ind Ltd | Smelting reduction method for iron oxide using rotary kiln |
| US20040112834A1 (en) * | 2002-04-03 | 2004-06-17 | Libardo Perez | Mineral ore slurry viscosity modification method |
| CN101824554A (en) * | 2010-03-12 | 2010-09-08 | 瑞科稀土冶金及功能材料国家工程研究中心有限公司 | Liquid alkali roasting decomposition extraction process of mixed rare earth concentrates |
| CN102409164A (en) * | 2011-12-02 | 2012-04-11 | 中国科学院过程工程研究所 | Anti-caking roasting method of mixed rare earth ore |
Non-Patent Citations (1)
| Title |
|---|
| 金汉强等: "过磷酸钙活化疏松剂的应用研究", 《硫磷设计与粉体工程》, no. 6, 31 December 2003 (2003-12-31) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103725870B (en) | 2016-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101824554B (en) | Liquid alkali roasting decomposition extraction process of mixed rare earth concentrates | |
| CN103966424B (en) | A kind of method of blank vanadium slag sintering vanadium extraction | |
| CN102277483B (en) | Method for preparing rare earth chloride by using Baiyunebo rare earth concentrate | |
| CN105543509A (en) | Method for preparing rare earth chloride from mixed rare earth concentrate or bastnaesite concentrate | |
| CN102212674A (en) | Process for comprehensively recovering liquid alkali roasting resource of mixed rare earth concentrate | |
| CN111167830A (en) | Comprehensive treatment and utilization process of secondary aluminum ash | |
| CN103979584B (en) | A kind of boric sludge is for Magnesium Carbonate Light 41-45 technique | |
| CN102627305A (en) | Method using alkaline process to extract alumina in coal ash | |
| CN103288107A (en) | Method for preparing high-purity aluminum oxide from coal gangue | |
| CN110129565B (en) | Method for preparing ferrosilicon alloy by feeding aluminum ash as raw material through hollow electrode | |
| CN104310817B (en) | A kind of method utilizing industrial sludge to make reacting movable agent dry process clinker | |
| CN106337135A (en) | Novel method for producing vanadium pentoxide through ammonium-free vanadium precipitation | |
| CN114804668A (en) | Preparation method of activated carbon-fixing material for producing recycled aggregate | |
| CN101824531A (en) | Liquid alkali low-temperature roasting decomposition process of caustic soda liquid of mixed rare earth concentrates | |
| CN109321752B (en) | Method for preparing regenerated iron particles by using metal surface treatment waste | |
| CN114405962A (en) | Method for efficiently removing ammonia nitrogen in electrolytic manganese slag | |
| CN109136538A (en) | The processing method of rare earth ore concentrate | |
| CN106011493A (en) | Roasting method of low-grade vanadium slags | |
| CN103627915A (en) | Method of roasting, converting and decomposing fluorine-containing rear earth by calcium compound | |
| CN102732736B (en) | Method for extracting vanadium from burning slag of stone coal vanadium mine fluidized bed | |
| CN104164571A (en) | Method for recovering valuable metal elements in converter vanadium slag | |
| CN103725870B (en) | A kind of liquid alkali roasting decomposes the method that rare earth ore concentrate prevents ring formation | |
| CN104711428B (en) | Method for preparing and recovering metal in pickling sludge | |
| CN103436712B (en) | Method for increasing leaching rate of copper in difficult-to-treat mineral | |
| CN109402386A (en) | It is a kind of promote red mud iron alum recovery compound additive and its preparation, application method |
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 |