CN103074504A - Electrical heating internal resistance electric melting method for decomposing mixed rare earth ore concentrate and electric heating decomposer thereof - Google Patents
Electrical heating internal resistance electric melting method for decomposing mixed rare earth ore concentrate and electric heating decomposer thereof Download PDFInfo
- Publication number
- CN103074504A CN103074504A CN2012103905321A CN201210390532A CN103074504A CN 103074504 A CN103074504 A CN 103074504A CN 2012103905321 A CN2012103905321 A CN 2012103905321A CN 201210390532 A CN201210390532 A CN 201210390532A CN 103074504 A CN103074504 A CN 103074504A
- Authority
- CN
- China
- Prior art keywords
- rare earth
- thorium
- mixed rare
- internal resistance
- electrically heated
- 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.)
- Pending
Links
Images
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The invention provides a decomposition method for rare earth ore concentrate. The method comprises the following process steps: (1) mixing mixed rare earth ore concentrate with concentrated sulfuric acid according to mass ratio in an electric heating decomposer; (2) heating the material with resistance heat generated by current flowing through the material after energization of the electric heating decomposer; (3) leaching output roasted ore by water; and neutralizing the solution with magnesium oxide to obtain iron phosphate, thorium phosphate precipitate and phosphorus phosphate precipitate; (4) removing sulfuric acid mist and dust in roasting tail gas; then spraying with liquid caustic soda to absorb fluorine, so as to precipitate sodium acid fluoride; and emptying the gas with acid and fluoride removed; and (5) cleaning and discharging the leached slag. The method provided by the invention employs electric heating to substitute fuel burning heating to lower processing capacity of waste gas and wastewater to 5% of that of an original process, so as to save energy, investment and operation cost; waste gas and waste residue reach discharge standards, and waste water can be recycled; and recovery rate of rare earth, thorium and fluorine is improved, so as to solve the problem of reuse of thorium and fluoride.
Description
Technical field
The present invention relates to a kind of mixed rare earth concentrate decomposition method, belong to the rare earth metallurgy field.
Background technology
China's packet header mixed rare earth concentrate contains hamartite (REFCO
3), monazite (REPO
4) and fluorite (CaF
2), contain the radioelement thorium in the monazite and surpass 0.2%, belong to the concomitant radioactivity ore deposit.Existing mixed rare earth concentrate decomposition method is the concentrated sulfuric acid roasting decomposition method, namely first the vitriol oil is mixed according to mass ratio 1: 1.1～1.7 with mixed rare earth concentrate, carry out roasting under high temperature in rotary kiln (being lower than 900 ℃) or low temperature (the being lower than 300 ℃) condition, make rare-earth mineral be converted to water miscible vitriol, again through the operations such as the leaching of product of roasting, purification and impurity removal are produced various rare-earth products.
Above-mentioned vitriol oil high-temperature roasting decomposition technique is called again three generations's acid system, is the main method of using in the present domestic production.There are the following problems aspect environmental protection and the utilization of resources for this method: the large and very difficult qualified discharge of (1) exhausted air quantity.Because rotary kiln relies on combustion chemistry fuel that heat is provided, need to introduce a large amount of combustion airs; Sulfuric acid volatilization in roasting process is decomposed generation sulfurous gas in a large number to sulfuric acid more than 300 ℃; Sulfuric acid and mineral effect produce the fluorochemicals such as hydrogen fluoride and silicon fluoride.During combusting heavy oil, 1 ton of (REO50%) mixed rare earth concentrate of general every processing produces 6000Nm approximately
3Torrefaction waste gas, sulfur-bearing acid mist 150～200kg wherein, sulfurous gas, sulphur trioxide～200kg, fluorochemical～80kg, flue dust 30～50kg.Torrefaction waste gas adopts the water spray to process, the difficult reuse of waste heat, and the real row's value of discharge all (is respectively: SO2＜850mg/m far above discharging standards
3Sulfuric acid mist＜45mg/m
3Fluorochemical＜6mg/m
3), serious environment pollution.(2) wastewater flow rate is large and processing costs is high.Above-mentioned spray discharging waste gas produces a large amount of acid waste waters, and 1 ton of mixed rare earth concentrate of every processing will be discharged 15 tons of acid waste waters, and wherein the nitration mixture such as sulfur acid, hydrofluoric acid is 0.5 ton.Because its output is large, complicated, high, the seriously corroded of impurity level, intractability is very large.Adopt lime neutralization or alkali neutralization, can not recovered acid and increase running cost; After adopting sour concentration and recovery technology, recyclable 70% sulfuric acid and 15% hydrofluoric acid, but scale of investment is large, and it is special, not easy to operate that equipment and materials requires.(3) produce emissive industrial waste residue.Maturing temperature is more than 200 ℃ the time, and thorium sulfate becomes the thorium pyrophosphate of indissoluble with the tetra-sodium role transformation that the phosphoric acid dehydration generates.Thorium pyrophosphate enters leached mud during leaching, has both lost thorium resources, and the leached mud radioactivity is exceeded standard, and (its specific radioactivity is 2.1 * 10
5Bg/kg surpasses 7.4 * 10 of standard GB/T 9133-88
42.8 times of Bg/kg), belong to the radioactivity slag, need build radioactive waste repository and store, have Environmental Safety hidden danger.
Mixed rare earth concentrate also available vitriol oil low-temperature bake method decomposes.Chinese patent (application number: 98118153.8, open day: on March 8th, 2000) propose in " process for decomposing rare-earth ore by acid method " in the static roasting mixed rare earth concentrates of 180～300 ℃ of intermittent types and vitriol oil mixture 7～13 hours, reduce the decomposition amount of sulfuric acid, solidify hydrogen fluoride gas with ammonia simultaneously, obtain qualified discharging waste gas with assurance, but do not relate to the radioactive pollution of thorium in the leached mud.
Chinese patent (application number: 02144405.6, open day: on March 26th, 2003) propose at 150～330 ℃ of roasting mixed rare earth concentrates and vitriol oil mixture in " rare earth ore concentrate vitriol oil low-temperature bake decomposition technique ", reduce the decomposition amount of sulfuric acid, wash with water and remove fluorine, make simultaneously the thorium in the concentrate convert water miscible vitriol to, the leached mud activity ratio puts＜and 7.4 * 10
4Bg/kg has reduced the radioactivity of slag.
Chinese patent (application number: 200410006443.8, open day: on November 29th, 2006) propose in " a kind of mixed rare earth concentrate decomposition method ", mixed rare earth concentrate and vitriol oil mixture 40～180 ℃ of slakings 8 hours, again 150～330 ℃ of roastings 1～8 hour; Then water leaches roasted ore, rare earth and 95% above thorium more than 95% is leached in the infusion, again through extracting and separating thorium and rare earth.Torrefaction waste gas discharges after ammonia defluorinate or water washing, and discharging after the leached mud washing reaches discharging standards.
By above-mentioned vitriol oil low-temperature bake decomposition method as can be known, reduce recyclable thorium and fluorine behind the maturing temperature, thereby overcome the difficult problem that high-temperature roasting can not be recycled the valuable elements such as thorium, fluorine.The problem that low-temperature bake exists is, adopt the heating of rotary kiln and combustion chemistry fuel, maturing temperature is reduced to about 300 ℃, but roasting time extends to 7～16 hours by 1～2 hour of pyroprocess, the exhausted air quantity that produces and wastewater flow rate surpass pyroprocess, and the processing working cost of qualified discharge is high.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing Rare Earth Concentrate Decomposition method, a kind of energy-saving and emission-reduction are provided, realize the Rare Earth Concentrate Decomposition method of cleaner production.The valuable elements such as another object of the present invention is can the efficient recovery rare earth, thorium, fluorine.
Purpose of the present invention mainly is achieved by following technical proposals: directly use the mixture of electrically heated rare earth ore concentrate and sulfuric acid, replace the heating of combustion chemistry fuel, significantly reduced torrefaction waste gas amount and spray wastewater flow rate, more easily realize qualified discharge.The temperature of electrically heated low-temperature decomposition is controlled, but the valuable elements such as efficient recovery rare earth, thorium, fluorine.
The present invention includes a kind of electrically heated synthesis by internal resistance electric melting and decompose the mixed rare earth concentrate method, the method comprises following processing step:
(1) being 40%～60% mixed rare earth concentrate with content of rare earth mixes in the electrothermal decomposition groove with 90%～97% the vitriol oil 1: 1.3 in mass ratio～1.7;
(2) but the electrothermal decomposition groove is the container of an input AC electricity, flow through the resistance heat that material produces by electric current after the energising and make material itself obtain heating, 80～180 ℃ of roasting temperatures 1～7 hour, again 180～300 ℃ of roasting temperatures 1～4 hour;
The roasted ore of (3) roasting output adopts water logging to go out, and most rare earths and thorium are entered in the solution; Through the Magnesium peroxide neutralization solution, obtain the calcium phosphate precipitation thing of iron, thorium, phosphorus; Solution after the neutralization is the rare-earth products of thoriated not;
(4) baking tail gases adopts the Venturi meter cooling, removes sulfuric acid mist and dust; Adopt liquid caustic soda, namely 20%～40%NaOH solution spraying absorbs fluorine again, generates sodium acid fluoride NaHF
2Separate out; Gas behind deacidification and the fluorine is emptying;
(5) slag after the leaching discharges after the employing water washing.
Aforesaid electrically heated synthesis by internal resistance electric melting is decomposed the mixed rare earth concentrate method, in the electrothermal decomposition groove, mix the vitriol oil and rare earth ore concentrate, input AC electrically heated material in same groove, and 80 ℃～180 ℃ roasting temperatures 1～7 hour, again 180 ℃～300 ℃ roasting temperatures 1～4 hour.
Aforesaid electrically heated synthesis by internal resistance electric melting is decomposed the mixed rare earth concentrate method, wherein, and 80～180 ℃ of roasting temperatures 1～4 hour, again 180～300 ℃ of roasting temperatures 1～2 hour.
Aforesaid electrically heated synthesis by internal resistance electric melting is decomposed the mixed rare earth concentrate method, it is characterized in that, adopts water logging to go out roasted ore, in the magnesium oxide and leach liquor, obtains qualified rare earth feed liquid and thorium enriched thing.
Aforesaid electrically heated synthesis by internal resistance electric melting is decomposed the mixed rare earth concentrate method, it is characterized in that, baking tail gases adopts Venturi meter and liquid caustic soda spray to remove sulfuric acid, dust and hydrogen fluoride, reclaims simultaneously the sodium acid fluoride product.
Aforesaid electrically heated synthesis by internal resistance electric melting is decomposed the mixed rare earth concentrate method, it is characterized in that, the electrothermal decomposition groove be a usefulness acid-proof refractory build by laying bricks or stones end square container arranged, the both sides relative position of its inwall has two conductive plates, material is soft steel or graphite;---mixture---another pole plate forms the galvanic circle by pole plate during energising, rely on the resistance heat that electric current flows through the material generation to make material itself obtain heating, the uniformity of temperature profile of material is consistent, and the size of control inputs electric current can accurately be controlled heat-up rate and the temperature height of material.
A kind of aforesaid electrically heated synthesis by internal resistance electric melting is decomposed the electrothermal decomposition groove that uses in the mixed rare earth concentrate method, it is characterized in that, the electrothermal decomposition groove be a usefulness acid-proof refractory build by laying bricks or stones end square container arranged, the both sides relative position of its inwall has two conductive plates, and material is soft steel or graphite;---mixture---another pole plate forms the galvanic circle by pole plate during energising, rely on the resistance heat that electric current flows through the material generation to make material itself obtain heating, the uniformity of temperature profile of material is consistent, and the size of control inputs electric current can accurately be controlled heat-up rate and the temperature height of material.
The invention effect:
(1) owing to adopt electrically heated to replace the combustion method heating, baking tail gases only decomposes the gas that produces for mineral, and 1 ton of (REO50%) mixed rare earth concentrate of every processing produces 340Nm approximately
3Baking tail gases, be about 5% of combustion method exhausted air quantity, wherein fluorine-containing, sulphur gas about 20%.High density tail gas is convenient to concentrate efficient the processing, and investment and the working cost of simultaneously smoke gas treatment system can reduce by 80%.
(2) baking tail gases adopts Venturi meter cooling, sedimentation reclaim(ed) sulfuric acid and dust; Then adopt liquid caustic soda (20%～40%NaOH solution) through secondary spray-absorption fluorine, NaOH and HF reaction generates sodium acid fluoride NaHF in the solution
2, for the molten thing of shipwreck, with crystallization, thereby effectively reclaim fluorine.
(3) because maturing temperature can be accurately controlled in electrically heated, and the uniformity of temperature profile of material, strengthened the rare-earth mineral decomposition, the rate of decomposition of rare earth ore concentrate is a little more than the Roasting Decomposition rate of combustion method, and the rare earth leaching yield is greater than 95%.
(4) because maturing temperature can accurately be controlled, in the situation that guarantees the rare earth rate of decomposition, maturing temperature can be lower than thorium pyrophosphate and generate temperature.Thorium generates water-soluble salt in the concentrate, enters solution when water logging, and leaching yield is greater than 95%.The leached mud specific radioactivity is less than 1 * 10
4Bg/kg meets national non-radioactive substance standard, can directly discharge, and reduces radioactivity slag storage cost and environmental protection hidden danger.
(5) recovery of thorium is to adopt in the magnesium oxide and infusion, thereby makes the co-precipitation of iron phosphorus thorium obtain the thoriated enriched substance.The thoriated enriched substance run up to a certain amount of after, available sulfuric acid dissolution adopts the extraction of maturation process primary amine to reclaim, and makes thorium nitrate 99.99004323A8urity.
(6) the present invention is in the roasting of electrothermal decomposition groove discontinuous formula, and the uniformity of temperature profile of material is consistent, and the temperature height is controlled, guarantees the stable decomposition of rare earth ore concentrate, obtains high rate of decomposition; Guarantee simultaneously the solubility of thorium, obtain the high rate of recovery; Hydrogen fluoride in the baking tail gases and sulfuric acid also obtain the high rate of recovery.
Technical scheme provided by the invention has fundamentally solved the deficiency that roasting process of sulfuric acid exists, and adopts electrically heated to replace combustion heating, makes the treatment capacity of waste gas and waste water reduce to about 5% of former technique, save energy, investment and working cost; Waste gas, waste residue qualified discharge, cycling utilization of wastewater has solved " three wastes " pollution problem to environment; Improve the rate of recovery of rare earth, thorium and fluorine, solved the recycling problem of thorium, fluorine.
Description of drawings
Fig. 1 is process flow diagram of the present invention.
Fig. 2 is electrothermal decomposition groove structural representation of the present invention.
Fig. 3 is electrothermal decomposition groove vertical view of the present invention.
Reference numeral is as follows: cell body 1, and conductive plate 2, rare earth ore concentrate add entrance 3, and sulfuric acid adds entrance 4, agitator 5, axle 6, tail gas outlet 7.
Embodiment
Below in conjunction with embodiment in detail technical scheme provided by the invention is described in detail, but not as the restriction to claim protection domain of the present invention.
Embodiment:
Get the 5kg mixed rare earth concentrate, concentrate main component following (mass percent):
REO F P CaO TFe ThO
2
52.19 8.79 4.10 7.90 5.40 0.21
Get 7.5kg concentration and be 95% industrial sulphuric acid, sulfuric acid is added decomposer, more above-mentioned rare earth ore concentrate is added decomposer, start agitator and mixed about 10 minutes; Heat is emitted in moisture and the reaction of part mineral in sulfuric acid and the concentrate at this moment, and temperature instrumentation shows that temperature of charge reaches 80 ℃, stops to stir; Pass into the AC electric-heating material, adjust the size of received current, in 4 hours, make temperature of charge by 80 ℃ of risings to 200 ℃; Suitably improve received current, in 2 hours, make temperature of charge rise to 280 ℃ by 200 ℃; Have a power failure, the decline decomposer tank makes it to separate with the groove lid, and the cell body that verts draws off roasted ore.
With the roasted ore water logging of output, filter; Analyze rare earth and the thorium content of slag and filtrate, filtrate middle-weight rare earths leaching yield is greater than 95%, and the thorium leaching yield is greater than 95%; Filter residue washing, washing lotion be as the infusion of next batch roasted ore, in the slag thorium content less than ten thousand/, specific radioactivity is less than 1 * 10
4Bg/kg; Adopt the magnesium oxide neutralization filtrate, control iron phosphorus ratio is 2～3, pH=4～4.5, makes iron, phosphorus, thorium co-precipitation, filters, and with the rear filtrate composition, thorium content meets the quality index requirement of rare earth sulfate solution less than 0.001g/L in the analysis; Iron phosphorus thorium filter residue is thorium enriched thing.
In decomposer energising heat-processed, the exhaust temperature of discharge is between 80 ℃～280 ℃, and tail gas is through the Venturi meter water cooler, and temperature is down to 50 ℃～80 ℃, and most of particulate matter and sulfuric acid mist are removed in simultaneously sedimentation; Pass through secondary filler sprayed tank again, absorb hydrogen fluoride and sulfuric acid mist with liquid caustic soda (20%～40%NaOH solution), specific absorption makes fluorochemical＜1mg/m in the emission gases more than 99%
3, sulfuric acid mist＜15mg/m
3, SO
2＜29mg/m
3, reached discharging standards.Every grade of sprayed tank is established the secondary settling bowl, and liquid caustic soda absorption hydrogen fluoride and reaction generate sodium acid fluoride NaHF
2, in settling bowl, with crystallization, regularly discharge and obtain moisture sodium acid fluoride product.
Such as Fig. 2, shown in Figure 3: a kind of electrothermal decomposition groove, this cell body 1 is square container, the both sides relative position of wall has two conductive plates 2 within it, be respectively equipped with in cell body 1 upper end that rare earth ore concentrate adds entrance 3 and sulfuric acid adds entrance 4, in cell body 1, be provided with agitator 5, the axle 6 of agitator 5 is from being connected with the main body of agitator 5 in cell body 1 upper end entrance extension to cell body 1 bottom, and cell body 1 sidewall on the top of conductive plate 2 has tail gas outlet 7.Cell body 1 is built by laying bricks or stones for acid-proof refractory and is formed.The material of two conductive plates 2 is soft steel or graphite.---mixture---another pole plate forms the galvanic circle by pole plate during energising, rely on the resistance heat that electric current flows through the material generation to make material itself obtain heating, the uniformity of temperature profile of material is consistent, and the size of control inputs electric current can accurately be controlled heat-up rate and the temperature height of material.
Claims (7)
1. an electrically heated synthesis by internal resistance electric melting is decomposed the mixed rare earth concentrate method, it is characterized in that the method comprises following processing step:
(1) being 40%～60% mixed rare earth concentrate with content of rare earth mixes in the electrothermal decomposition groove with 90%～97% the vitriol oil 1: 1.3 in mass ratio～1.7;
(2) but the electrothermal decomposition groove is the container of an input AC electricity, flow through the resistance heat that material produces by electric current after the energising and make material itself obtain heating, 80～180 ℃ of roasting temperatures 1～7 hour, again 180～300 ℃ of roasting temperatures 1～4 hour;
The roasted ore of (3) roasting output adopts water logging to go out, and most rare earths and thorium are entered in the solution; Through the Magnesium peroxide neutralization solution, obtain the calcium phosphate precipitation thing of iron, thorium, phosphorus; Solution after the neutralization is the rare-earth products of thoriated not;
(4) baking tail gases adopts the Venturi meter cooling, removes sulfuric acid mist and dust; Adopt liquid caustic soda, namely 20%～40%NaOH solution spraying absorbs fluorine again, generates sodium acid fluoride NaHF
2Separate out; Gas behind deacidification and the fluorine is emptying;
(5) slag after the leaching discharges after the employing water washing.
2. electrically heated synthesis by internal resistance electric melting according to claim 1 is decomposed the mixed rare earth concentrate method, it is characterized in that, in the electrothermal decomposition groove, mix the vitriol oil and rare earth ore concentrate, input AC electrically heated material in same groove, and 80 ℃～180 ℃ roasting temperatures 1～7 hour, again 180 ℃～300 ℃ roasting temperatures 1～4 hour.
3. each described electrically heated synthesis by internal resistance electric melting is decomposed mixed rare earth concentrate method according to claim 1-2, wherein, and 80～180 ℃ of roasting temperatures 2～4 hours, again 180～300 ℃ of roasting temperatures 1～2 hour.
4. each described electrically heated synthesis by internal resistance electric melting is decomposed mixed rare earth concentrate method according to claim 1-3, it is characterized in that, adopts water logging to go out roasted ore, in the magnesium oxide and leach liquor, obtains qualified rare earth feed liquid and thorium enriched thing.
5. each described electrically heated synthesis by internal resistance electric melting is decomposed the mixed rare earth concentrate method according to claim 1-4, it is characterized in that, baking tail gases adopts Venturi meter and liquid caustic soda spray to remove sulfuric acid, dust and hydrogen fluoride, reclaims simultaneously the sodium acid fluoride product.
6. each described electrically heated synthesis by internal resistance electric melting is decomposed the mixed rare earth concentrate method according to claim 1-5, it is characterized in that, the electrothermal decomposition groove be a usefulness acid-proof refractory build by laying bricks or stones end square container arranged, the both sides relative position of its inwall has two conductive plates, material is soft steel or graphite;---mixture---another pole plate forms the galvanic circle by pole plate during energising, rely on the resistance heat that electric current flows through the material generation to make material itself obtain heating, the uniformity of temperature profile of material is consistent, and the size of control inputs electric current can accurately be controlled heat-up rate and the temperature height of material.
7. one kind is decomposed the electrothermal decomposition groove that uses in mixed rare earth concentrate method such as each described electrically heated synthesis by internal resistance electric melting of claim 1-6, it is characterized in that, the electrothermal decomposition groove be a usefulness acid-proof refractory build by laying bricks or stones end square container arranged, the both sides relative position of its inwall has two conductive plates, and material is soft steel or graphite;---mixture---another pole plate forms the galvanic circle by pole plate during energising, rely on the resistance heat that electric current flows through the material generation to make material itself obtain heating, the uniformity of temperature profile of material is consistent, and the size of control inputs electric current can accurately be controlled heat-up rate and the temperature height of material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103905321A CN103074504A (en) | 2012-09-29 | 2012-09-29 | Electrical heating internal resistance electric melting method for decomposing mixed rare earth ore concentrate and electric heating decomposer thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103905321A CN103074504A (en) | 2012-09-29 | 2012-09-29 | Electrical heating internal resistance electric melting method for decomposing mixed rare earth ore concentrate and electric heating decomposer thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103074504A true CN103074504A (en) | 2013-05-01 |
Family
ID=48151197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103905321A Pending CN103074504A (en) | 2012-09-29 | 2012-09-29 | Electrical heating internal resistance electric melting method for decomposing mixed rare earth ore concentrate and electric heating decomposer thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103074504A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103638803A (en) * | 2013-12-19 | 2014-03-19 | 宜兴新威利成稀土有限公司 | Rare-earth waste gas treatment system |
| CN107475542A (en) * | 2017-07-17 | 2017-12-15 | 中国恩菲工程技术有限公司 | The method for handling rare earth ore concentrate |
| CN111363914A (en) * | 2020-04-23 | 2020-07-03 | 西安三瑞实业有限公司 | System and method for acidizing and roasting rare earth concentrate by using multi-section external heating rotary furnace |
| CN115323177A (en) * | 2022-08-11 | 2022-11-11 | 甘肃稀土新材料股份有限公司 | Method for extracting rare earth from rare earth waste by low-temperature intensified roasting method |
| CN116987893A (en) * | 2023-08-10 | 2023-11-03 | 长沙市丰程有色金属材料有限责任公司 | Method for recycling monazite slag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290117A (en) * | 1999-09-28 | 2001-04-04 | 食品工业发展研究所 | Device and method for heating food |
| CN1667139A (en) * | 2004-03-08 | 2005-09-14 | 中国有色工程设计研究总院 | Mixed rare earth concentrate decomposition method |
| CN1721559A (en) * | 2004-12-15 | 2006-01-18 | 北京有色金属研究总院 | Process for comprehensive recovery of rare earth and thorium from rare earth ore |
-
2012
- 2012-09-29 CN CN2012103905321A patent/CN103074504A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290117A (en) * | 1999-09-28 | 2001-04-04 | 食品工业发展研究所 | Device and method for heating food |
| CN1667139A (en) * | 2004-03-08 | 2005-09-14 | 中国有色工程设计研究总院 | Mixed rare earth concentrate decomposition method |
| CN1721559A (en) * | 2004-12-15 | 2006-01-18 | 北京有色金属研究总院 | Process for comprehensive recovery of rare earth and thorium from rare earth ore |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103638803A (en) * | 2013-12-19 | 2014-03-19 | 宜兴新威利成稀土有限公司 | Rare-earth waste gas treatment system |
| CN103638803B (en) * | 2013-12-19 | 2015-07-15 | 宜兴新威利成稀土有限公司 | Rare-earth waste gas treatment system |
| CN107475542A (en) * | 2017-07-17 | 2017-12-15 | 中国恩菲工程技术有限公司 | The method for handling rare earth ore concentrate |
| US20200056265A1 (en) * | 2017-07-17 | 2020-02-20 | China Enfi Engineering Corporation | Method and system for processing rare earth concentrate ore |
| CN107475542B (en) * | 2017-07-17 | 2021-03-16 | 中国恩菲工程技术有限公司 | Method for treating rare earth concentrate |
| US11773467B2 (en) * | 2017-07-17 | 2023-10-03 | China Enfi Engineering Corporation | Method and system for processing rare earth concentrate ore |
| CN111363914A (en) * | 2020-04-23 | 2020-07-03 | 西安三瑞实业有限公司 | System and method for acidizing and roasting rare earth concentrate by using multi-section external heating rotary furnace |
| CN115323177A (en) * | 2022-08-11 | 2022-11-11 | 甘肃稀土新材料股份有限公司 | Method for extracting rare earth from rare earth waste by low-temperature intensified roasting method |
| CN116987893A (en) * | 2023-08-10 | 2023-11-03 | 长沙市丰程有色金属材料有限责任公司 | Method for recycling monazite slag |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1286995C (en) | Mixed rare earth concentrate decomposition method | |
| CN106119544B (en) | A kind of method that titanium slag, tungsten and vanadic salts are extracted from discarded SCR catalyst | |
| CN109750156A (en) | A method of recycling vanadium, tungsten/molybdenum and titanium elements from discarded SCR denitration | |
| CN100482814C (en) | Extraction of vanadium and molybdenum compound from refused materials containing vanadium and molybdenum etc. multiple elements | |
| CN102212674A (en) | Process for comprehensively recovering liquid alkali roasting resource of mixed rare earth concentrate | |
| CN103074504A (en) | Electrical heating internal resistance electric melting method for decomposing mixed rare earth ore concentrate and electric heating decomposer thereof | |
| CN103526017A (en) | Extraction method of valuable elements from acid mud produced in sulfuric acid production by copper smelting flue gas | |
| CN103103349B (en) | Method for decomposing bayan obo rare earth ore concentrate by acid and alkali combination at low temperature | |
| CN101824554A (en) | Liquid alkali roasting decomposition extraction process of mixed rare earth concentrates | |
| US11196107B2 (en) | Method for recycling lead paste in spent lead-acid battery | |
| CN105132950A (en) | System and method for producing fully-graphitized carbon product through waste cathode carbon blocks of electrolyzed aluminum | |
| CN105197987B (en) | PbO, PbSO4, PbO2the separation method of mixture | |
| CN108787718A (en) | A kind of aluminium electroloysis is given up mechanochemistry conversion and recovery method in breeze containing sodium, fluorochemical | |
| CN105374988A (en) | Comprehensive utilization method for resources of waste lead storage battery | |
| CN109127655A (en) | A kind of aluminium electroloysis is given up in breeze containing sodium, the method for transformation of fluorochemical and system | |
| CN104555947B (en) | Method for recovering electrolytic manganese slag | |
| CN109108050A (en) | Containing sodium, the method for transformation of fluorochemical and system in a kind of aluminium electroloysis slag from delining | |
| CN103924073A (en) | Method for decomposing rare earth ore concentrate through roasting by liquid caustic soda and acid-leaching rare earth through intensifying by ultrasonic | |
| CN101824531A (en) | Liquid alkali low-temperature roasting decomposition process of caustic soda liquid of mixed rare earth concentrates | |
| RU2472865C1 (en) | Method of processing fluorine-containing wastes from electrolytic production of aluminium | |
| CN108486379B (en) | The efficient separation method of arsenic and alkali in a kind of arsenic alkaline slag | |
| CN107364880B (en) | Method and system for recycling fluorine from electrolytic aluminum waste slot liners | |
| CN109264751A (en) | A method of extracting lithium carbonate and ammonium metavanadate from lepidolite and vanadium-containing shale | |
| CN102586621B (en) | Method and device for removing sulfur and fluorine as well as chlorine and by zinc oxide serous fluid | |
| CN102634656B (en) | Method for preparing electrolytic manganese/electrolytic manganese dioxide by cyclically leaching manganese oxide with sulfur and calcium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130501 |