CN203065540U - Electrothermal decomposition tank for decomposing mixed rare-earth concentrate by using electric-heating internal heating method - Google Patents
Electrothermal decomposition tank for decomposing mixed rare-earth concentrate by using electric-heating internal heating method Download PDFInfo
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- CN203065540U CN203065540U CN 201220529124 CN201220529124U CN203065540U CN 203065540 U CN203065540 U CN 203065540U CN 201220529124 CN201220529124 CN 201220529124 CN 201220529124 U CN201220529124 U CN 201220529124U CN 203065540 U CN203065540 U CN 203065540U
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Abstract
The utility model discloses an electrothermal decomposition tank for decomposing mixed rare-earth concentrate by using an electric-heating internal heating method. A tank body is of a square vessel, two conductive polar plates are arranged at relative positions of the two sides of the internal wall of the tank body, a rare-earth concentrate adding port and a sulfuric acid adding port are respectively formed in the upper end of the tank body, a stirrer is arranged in the tank body, a shaft of the stirrer extends to the bottom of the tank body from an upper end inlet of the tank body and is connected with a main body of the stirrer, and a tail gas lead-out port is formed in the sidewall of the tank body at the upper parts of the conductive polar plates. The electrothermal decomposition tank has the advantages that the calcination temperature can be controlled accurately, so that the temperature distribution of materials is uniform, and the decomposition of rare-earth minerals is enhanced. The calcination temperature of the electrothermal decomposition tank can be controlled accurately, the intermittent calcination is carried out in the electrothermal decomposition tank, the temperature distribution of the materials is uniform, the temperature is controllable, and the stable decomposition of the rare-earth concentrate is guaranteed so as to obtain a high decomposition ratio.
Description
Technical field:
The utility model relates to a kind of electric heating decomposer for the mixed rare earth concentrate decomposition, belongs 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 association radioactivity ore deposit.Existing mixed rare earth concentrate decomposition method is the concentrated sulfuric acid roasting decomposition method, namely earlier 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 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 three generations's acid system again, 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 big 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 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 handle, the difficult reuse of waste heat, and the real row's value of discharge all (is respectively: SO far above discharging standards
2＜850mg/m
3Sulfuric acid mist＜45mg/m
3Fluorochemical＜6mg/m
3), serious environment pollution.(2) wastewater flow rate is big 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 nitration mixture such as sulfur acid, hydrofluoric acid is 0.5 ton.Because its output is big, composition is complicated, impurity level is high, seriously corroded, intractability is very big.Adopt lime neutralization or alkali neutralization, can not recovered acid and increase running cost; After adopting acid to concentrate recovery technology, recyclable 70% sulfuric acid and 15% hydrofluoric acid, but scale of investment is big, 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 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.
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 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:
It is a kind of simple in structure that the purpose of this utility model is to provide, and can well be used for the electric heating decomposer of the Controllable Temperature of mixed rare earth concentrate decomposition, electrically heated low-temperature decomposition.
The purpose of this utility model mainly is achieved by following technical proposals: a kind of electric heating decomposer, this cell body is square container, the both sides relative position of wall has two conductive plates within it, be respectively equipped with in cell body upper end that rare earth ore concentrate adds entrance and sulfuric acid adds entrance, in described cell body, be provided with agitator, the axle of described agitator is from being connected with the main body of described agitator in cell body upper end entrance extension to cell body bottom, and the cell body sidewall on the top of described conductive plate has the tail gas outlet.
The described cell body of this electric heating decomposer is that acid-proof refractory is built by laying bricks or stones and formed.
This electric heating decomposer, the material of described two conductive plates are 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 material temperature unanimity that is evenly distributed, the size of control received current can accurately be controlled heat-up rate and the temperature height of material.
Advantage of the present utility model is: adopt electric heating decomposer of the present utility model, can accurately control maturing temperature, thereby material temperature is evenly distributed, strengthened the rare-earth mineral decomposition.And this electric heating decomposer maturing temperature can accurately be controlled, in the roasting of electric heating decomposer discontinuous formula, and the material temperature unanimity that is evenly distributed, the temperature height is controlled, guarantees that rare earth ore concentrate is stable to decompose, and obtains high rate of decomposition.
Description of drawings:
Fig. 1 is structural representation of the present utility model.
Fig. 2 is electric heating decomposer 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:
As shown in Figure 1: a kind of electric heating decomposer, 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 material temperature unanimity that is evenly distributed, the size of control received current can accurately be controlled heat-up rate and the temperature height of material.
Claims (3)
1. an electrically heated synthesis by internal resistance electric melting is decomposed the electric heating decomposer of mixed rare earth concentrate, it is characterized in that, this cell body is square container, the both sides relative position of wall has two conductive plates within it, be respectively equipped with in cell body upper end that rare earth ore concentrate adds entrance and sulfuric acid adds entrance, be provided with agitator in described cell body, the axle of described agitator is from being connected with the main body of described agitator in cell body upper end entrance extension to cell body bottom, and the cell body sidewall on the top of described conductive plate has the tail gas outlet.
2. a kind of electrically heated synthesis by internal resistance electric melting according to claim 1 is decomposed the electric heating decomposer of mixed rare earth concentrate, it is characterized in that, described cell body is that acid-proof refractory is built by laying bricks or stones and formed.
3. a kind of electrically heated synthesis by internal resistance electric melting according to claim 1 is decomposed the electric heating decomposer of mixed rare earth concentrate, it is characterized in that the material of described two conductive plates is soft steel or graphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220529124 CN203065540U (en) | 2012-09-29 | 2012-09-29 | Electrothermal decomposition tank for decomposing mixed rare-earth concentrate by using electric-heating internal heating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220529124 CN203065540U (en) | 2012-09-29 | 2012-09-29 | Electrothermal decomposition tank for decomposing mixed rare-earth concentrate by using electric-heating internal heating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203065540U true CN203065540U (en) | 2013-07-17 |
Family
ID=48764354
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220529124 Expired - Fee Related CN203065540U (en) | 2012-09-29 | 2012-09-29 | Electrothermal decomposition tank for decomposing mixed rare-earth concentrate by using electric-heating internal heating method |
Country Status (1)
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|---|---|
| CN (1) | CN203065540U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039748A (en) * | 2015-07-20 | 2015-11-11 | 内蒙古自治区冶金研究院(内蒙古自治区冶金产品质量检验所) | Novel alkaline hydrolysis tank and novel heating device and method for rare earth production |
| WO2019015518A1 (en) * | 2017-07-17 | 2019-01-24 | 中国恩菲工程技术有限公司 | Apparatus for continuous decomposition of rare earth concentrate |
-
2012
- 2012-09-29 CN CN 201220529124 patent/CN203065540U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039748A (en) * | 2015-07-20 | 2015-11-11 | 内蒙古自治区冶金研究院(内蒙古自治区冶金产品质量检验所) | Novel alkaline hydrolysis tank and novel heating device and method for rare earth production |
| WO2019015518A1 (en) * | 2017-07-17 | 2019-01-24 | 中国恩菲工程技术有限公司 | Apparatus for continuous decomposition of rare earth concentrate |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130717 Termination date: 20170929 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |