CN105293587A - Method for preparing iron oxide red through microwave treatment of biologically-oxidized bacterium liquid - Google Patents
Method for preparing iron oxide red through microwave treatment of biologically-oxidized bacterium liquid Download PDFInfo
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- CN105293587A CN105293587A CN201510846581.5A CN201510846581A CN105293587A CN 105293587 A CN105293587 A CN 105293587A CN 201510846581 A CN201510846581 A CN 201510846581A CN 105293587 A CN105293587 A CN 105293587A
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- iron oxide
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Abstract
The invention discloses a method for preparing iron oxide red through microwave treatment of biologically-oxidized bacterium liquid. The method comprises the following steps: adding bacterium liquid, in which valuable elements are removed, into calcium oxide for neutralization precipitation, controlling pH value to 6-8, filtering, adding filter cakes obtained after filtration into a microwave reactor to be dried, wherein the microwave drying temperature is 100 DEG C, adding dried filter cakes into a sampling machine to be broken, screening through a 100-mesh sieve after breaking, adding materials under the sieve into a silicon carbide crucible in the microwave reactor, starting the microwave reactor, wherein the temperature is set to be 650 DEG C, starting a stirring and air-blasting system, and after completion of reaction, cooling so as to obtain iron oxide red. According to the invention, microwaves are adopted to treat the biologically-oxidized bacterium liquid, the heating speed is high, heating is uniform, the operation process is simple and easy to control, continuous production is facilitated and the production efficiency is high.
Description
Technical field
The present invention relates to a kind of method of microwave treatment bio-oxidation bacterium solution preparation iron oxide red, Pulse width is extracted in the technique of ferric oxide at bio-oxidation bacterium liquid, belongs to iron oxide red preparation field.
Background technology
Iron oxide red, formal name used at school ferric oxide, it is red-brown powder, and be a kind of rudimentary pigment, industrial title red iron oxide, in the industry such as paint, ink, rubber, can make catalyzer, the rumbling compound of glass, jewel, metal, can be used as iron-smelting raw material.
Preparation method has wet method and dry method.The crystallization of wet method goods is tiny, soft granules, comparatively easy grinding, is easy to make pigment.The crystallization of dry method goods is large, particle is hard, is suitable for making magneticsubstance, polishing abrasive substance.Be that dry method or wet method finally all need high-temperature calcination to form ferric oxide, calciner conventional at present has rotary kiln, rotary kiln etc.The production time of rotary kiln is long, and production cost is high, and furnace heat efficiency is low, and consume large, especially shopwork environment is poor, causes powder leak and fly upward, affects the recovery of product.
Industrial iron oxide red of preparing generally adopts the vitriol iron in production process to be raw material, if patent CN03150766 raw material sources are in the byproduct vitriol ferrous solution of titanium white production, wherein many containing manganese.The bacterium liquid of bio-oxidation is the solution utilizing the sulfur acid iron that iron and sulphur are formed in bacteria oxidise ore, high containing concentration of iron in solution, someone have studied the recovery of wherein valuable element to this part bacterium liquid, as the golden ore bacterium liquid of bio-oxidation has been carried out valuable element separation by patent CN200710056109.And iron ion content is high in bio-oxidation bacterium liquid, as all iron content in the bio-oxidation bacterium liquid of gold mine can up to 17mg/ml, as the good resource of recovery of iron oxide, the preparation of iron oxide red needs heating, microwave have selecting property heating, can overcome in material " cold " center ", realize automatically control; energy-conservation feature, effectively can improve heating efficiency.Adopt microwave treatment bio-oxidation bacterium solution preparation iron oxide red also for there being report, exploitation of the present invention can bring new production technique for the preparation of iron oxide red.
Summary of the invention
Invention provides a kind of method of microwave treatment bio-oxidation bacterium solution preparation iron oxide red, solve in current production process, production efficiency is low, heats uneven, easily the problem such as burning or underburnt occurs.The raising of method to technology level prepared by iron oxide red of microwave treatment bio-oxidation bacterium solution preparation iron oxide red of the present invention is significant.
The method of the present invention is: after bio-oxidation process ore, bio-oxidation bacterium liquid adds calcium oxide and generates ferric hydroxide precipitate after isolating valuable element, sedimentation and filtration, filter cake adopts microwave reactor to carry out microwave drying, and dried ironic hydroxide thermal degradation in the broken silicon carbide crucible joined in microwave reactor prepares iron oxide red.
The frequency of described microwave reactor is 2.45GHz, output rating 0-30kW.
Adding calcium oxide controls between bacterium liquid pH value 6-8; Add while stirring, stop stirring after pH value is stable, sedimentation and filtration.
The temperature that filter cake carries out microwave drying at microwave reactor is set as 100 DEG C; After dry, the moisture mass percent of filter cake is 3%-5%.
Dried filter cake is broken through sampling machine, crosses 100 mesh sieves after broken, and screen overflow continues broken with next batch filter cake, screen underflow enters thermal degradation in the silicon carbide crucible in microwave reactor and prepares iron oxide red; The temperature that microwave heating is decomposed is set to 650 DEG C, stirs and air blast.Stirring velocity 150rpm, the air quantity blasting air is 0.1m
3/ h.
Described middle silicon carbide crucible crucible diameter is 180mm, height 150mm.
Primitive reaction of the present invention is as follows:
FeSO
4+CaO+H
2O→Fe(OH)
2↓+CaSO
4
Fe
2(SO
4)
3+3CaO+3H
2O→2Fe(OH)
3↓+3CaSO
4
Fe(OH)
2→FeO+H
2O
4FeO+O
2→2Fe
2O
3
2Fe(OH)
3→Fe
2O
3+3H
2O
The present invention adopts microwave treatment bio-oxidation bacterium solution preparation iron oxide red, first the oxyhydroxide of the iron of the drying precipitated filtration of microwave heating function is utilized, the indirect rapid heating material of characteristic utilizing microwave can heat rapidly silicon carbide after fragmentation, material at high temperature decomposes, because the water produced under high temperature is gaseous state, need removing in time, therefore add the removal of stirring and being conducive to water vapour, be conducive to the even diffusion of temperature simultaneously.And ferrous hydroxide in material, may be contained, produce iron protoxide during decomposition, blasting air can increase oxygen level, makes iron protoxide be oxidized to iron oxide red, blasts air also strong in the discharge of water vapour simultaneously.
Beneficial effect of the present invention:
It is fast that the present invention produces iron oxide red speed, epigranular.There is easy control simple to operate, heat-up time is short, energy consumption is low, thermo-efficiency is high, be easy to continuous seepage, be easy to safeguard, greatly can reduce production cost.
Embodiment
Example one: the bacterium liquid of 5 liters of other valuable elements of removing is added calcium oxide while stirring, detects pH value constantly, when pH value is 6.8, quiescent setting filters, filter cake adds in microwave, and temperature sets 100 DEG C, records filter cake moisture about 3% after 10min, then carry out fragmentation, cross 100 mesh sieves.Screen underflow joins in silicon carbide crucible.Open microwave heating, design temperature 650 DEG C, open and stir and air blast, stirring velocity 150rpm, air quantity 0.1m
3/ h.Silicon carbide crucible naturally cooling is taken out after in 20min.Detect the mass content >90% of Indian red in the iron oxide red generated.
Example two: the bacterium liquid of 5 liters of other valuable elements of removing is added calcium oxide while stirring, detects pH value constantly, when pH value is 7.8, quiescent setting filters, filter cake adds in microwave, and temperature sets 100 DEG C, records filter cake moisture about 3% after 10min, then carry out fragmentation, cross 100 mesh sieves.Screen underflow joins in silicon carbide crucible.Open microwave heating, design temperature 600 DEG C, open and stir and air blast, stirring velocity 150rpm, air quantity 0.1m
3/ h.Silicon carbide crucible naturally cooling is taken out after in 20min.Detect the mass content >90% of Indian red in the iron oxide red generated.
Example three: the bacterium liquid of 5 liters of other valuable elements of removing is added calcium oxide while stirring, detects pH value constantly, when pH value is 6.0, quiescent setting filters, filter cake adds in microwave, and temperature sets 100 DEG C, records filter cake moisture about 5% after 8min, then carry out fragmentation, cross 100 mesh sieves.Screen underflow joins in silicon carbide crucible.Open microwave heating, design temperature 650 DEG C, open and stir and air blast, stirring velocity 150rpm, air quantity 0.1m
3/ h.Silicon carbide crucible naturally cooling is taken out after in 20min.Detect the mass content >90% of Indian red in the iron oxide red generated.
Above is described as principle of the present invention and feature, and the present invention is not by the restriction of above-mentioned example, and the present invention also has various improvement and change, and these improve with change in claimed scope of the present invention.
Claims (5)
1. the method for a microwave treatment bio-oxidation bacterium solution preparation iron oxide red, the method is: after bio-oxidation process ore, bio-oxidation bacterium liquid adds calcium oxide and generates ferric hydroxide precipitate after isolating valuable element, sedimentation and filtration, filter cake adopts microwave reactor to carry out microwave drying, and dried ironic hydroxide thermal degradation in the broken silicon carbide crucible joined in microwave reactor prepares iron oxide red.
2. the method for a kind of microwave treatment bio-oxidation bacterium solution preparation iron oxide red according to claim 1, is characterized in that: the frequency of described microwave reactor is 2.45GHz, output rating 0-30kW.
3. the method for a kind of microwave treatment bio-oxidation bacterium solution preparation iron oxide red according to claim 1, is characterized in that: add calcium oxide and control between bacterium liquid pH value 6-8; Add while stirring, stop stirring after pH value is stable, sedimentation and filtration.
4. the method for a kind of microwave treatment bio-oxidation bacterium solution preparation iron oxide red according to claim 1, is characterized in that: the temperature that filter cake carries out microwave drying at microwave reactor is set as 100 DEG C; The moisture mass percent 3%-5% of filter cake after dry.
5. the method for a kind of microwave treatment bio-oxidation bacterium solution preparation iron oxide red according to claim 1, it is characterized in that: dried filter cake is broken through sampling machine, 100 mesh sieves are crossed after broken, screen overflow continues broken with next batch filter cake, screen underflow enters thermal degradation in the silicon carbide crucible in microwave reactor and prepares iron oxide red; The temperature that microwave heating is decomposed is set to 650 DEG C, and stir and air blast, stirring velocity 150rpm, the air quantity blasting air is 0.1m
3/ h.
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| CN201510846581.5A CN105293587A (en) | 2015-11-28 | 2015-11-28 | Method for preparing iron oxide red through microwave treatment of biologically-oxidized bacterium liquid |
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| CN105293587A true CN105293587A (en) | 2016-02-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107244698A (en) * | 2017-06-17 | 2017-10-13 | 常州帝君金属构件厂 | A kind of preparation method of iron oxide red |
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2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107244698A (en) * | 2017-06-17 | 2017-10-13 | 常州帝君金属构件厂 | A kind of preparation method of iron oxide red |
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Application publication date: 20160203 |