CN102730702A - Method and device for fast preparing white activated rice hull ash - Google Patents
Method and device for fast preparing white activated rice hull ash Download PDFInfo
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- CN102730702A CN102730702A CN2012102468888A CN201210246888A CN102730702A CN 102730702 A CN102730702 A CN 102730702A CN 2012102468888 A CN2012102468888 A CN 2012102468888A CN 201210246888 A CN201210246888 A CN 201210246888A CN 102730702 A CN102730702 A CN 102730702A
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Abstract
The invention relates to method and device for fast preparing white activated rice hull ash. The method comprises the following steps: (1) carrying out diluted acid pretreatment on rich hulls for 2-24 hours; (2) washing the rice hulls subjected to diluted acid pretreatment for many times, and removing impurities in the rice hulls; and (3) directly placing the washes rice hulls into an incineration basket, and incinerating in a furnace body, controlling the grate temperature of the furnace body at the temperature of 600-800 DEG C, and preparing rice hull ash with 50 nanoscale particles, wherein the content of amorphous silica achieves more than 90%, the amorphous silica is white and evenly distributed, and the rich hull ash is loosely stacked. The device comprises an insulating furnace body, the incineration basket, a temperature controller, a thermocouple temperature sensor, a resistance wire, an adjustable air inlet and an adjustable air outlet. The method and the device can be used for fast producing white activated rice hull ash capable of substituting silica fume.
Description
Technical field
The present invention relates to a kind of method and device thereof of quick manufacturing white active rice husk ash, this device can provide a stable burning situation, and makes white active rice husk ash fast.
Background technology
Industrial waste, agriculture byproduct are recycled, not only helped to economize on resources and protect environment, and be the research focus of current crisis of resource.China is a large agricultural country, and the rice husk YO reaches more than 4,000 ten thousand tons, and the potential resources of rice hull ash is very big.Therefore, rice hull ash (RHA) is applied to have huge economic in the high performance concrete (HPC) as a kind of mineral admixture.
Rice husk mainly is made up of several parts such as coetonium, inner glume, sterile lemma, rachillas, the long awns that the mane shape is arranged outside the coetonium top.Rice husk is the shell shape, and thickness is less than 0.5mm, and length and width are according to the different branches that round shaped grain and length grain are arranged in the place of production.Rice husk rich cellulose, xylogen and silicon-dioxide, silicon-dioxide plays skeleton function with network-like distribution, and Mierocrystalline cellulose, xylogen etc. is filled in the grid.
Table 1 is inside and outside, section EDX scanning result (%)
| Test position | Si | K | Ca | Fe |
| Outside surface | 96.4200 | 2.7330 | 0.8470 | 0 |
| Internal surface | 92.3320 | 4.2350 | 2.2180 | 1.2150 |
| Interior tomography | 73.8710 | 21.2184 | 2.6310 | 1.1736 |
To showing inside and outside the rice husk that carrying out EDX analysis (result sees table 1) can know: the outside surface of rice husk, internal surface all are that silicon-dioxide constitutes more than 90%, also have potassium, calcium, ferrous metal element; The Si content of middle sectional layer is 73%, obviously is less than the surfaces externally and internally of rice husk; The sectional layer inside stuffing mainly is made up of metallic elements such as K, and the content of metallic element Ca, Fe is than surfaces externally and internally also showed increased.This phenomenon explanation metallic element has been participated in the inner cancellated framework of composition rice husk more.The constitutional features that rice husk is reduced by outer Si content inward gradually, and outer surface structure is fine and close, rice husk combustion processes internal heat dissipating is that rice husk does not have the long major reason of carbonization process time slowly.The metallic impurity of how removing in the rice husk internal structure also are the keys of making the high purity rice hull ash.Therefore rice husk is carried out sour pre-treatment, remove the metallic element in the dense structure, thereby destroy the rice husk internal microstructure, reach and be easy to burn.Produce the time that rice hull ash need be burned several days at present, although output can be bigger, quality does not far reach the requirement that is applied to high performance concrete.Therefore, develop a kind of apparatus and method of producing white active rice husk ash fast, have very high realistic meaning.
Summary of the invention
The object of the present invention is to provide a kind of method and device thereof of quick manufacturing white active rice husk ash, present method can be produced the grey white active rice husk ash of alternative silicon fast with device.
Technical program of the present invention lies in: a kind of method of quick manufacturing white active rice husk ash, carry out according to the following steps:
(1) rice husk is carried out dilute acid pretreatment, pretreatment time is 2 ~ 24 hours;
(2) rice husk after the dilute acid pretreatment need carry out repeatedly clean, and removes the impurity in the rice husk;
(3) will clean rice husk later and directly put in the burning basket, and place body of heater to burn, the fire box temperature of body of heater is controlled at 600 ℃ ~ 800 ℃; Produce rice hull ash; Its amorphous silica content is more than 90%, and color and luster is white in color and is evenly distributed, the loose accumulation of rice hull ash;
(4) will burn basket and take out, again rice hull ash carried out grinding or ball milling, and make its median size be controlled at 5 ~ 7 μ m.
In one embodiment; Above-mentioned body of heater one side is provided with the adjustable blast inlet; The opposite side of said body of heater is provided with heat radiation air outlet, and the top of said body of heater is provided with temperature controller, and the signal input part of the said temperature controller thermocouple temperature sensor interior with being arranged on burner hearth is connected; The signal output part of said temperature controller is connected with electrical heating element, with the heating of control electrical heating element.
In one embodiment; Above-mentioned adjustable blast inlet comprises the can slide up and down first air intake sliding door and the second air intake sliding door; The said first air intake sliding door and the second air intake sliding door are for being arranged side by side up and down; Said adjustable blast inlet top also is provided with exhaust outlet, and said exhaust outlet is provided with openable air draft dividing plate, and said air draft dividing plate is provided with the aperture that rice hull ash can't be blown out.
In one embodiment, above-mentioned heat radiation air outlet lower part is provided with fixedly shrouding, and its upper part is provided with the ventilation sliding door that can slide up and down out.
In one embodiment; Above-mentioned burning basket comprises high temperature resistant support and is coated on the network of micropores on the high temperature resistant support; Be provided with to the leg that extends below around the said high temperature resistant support, in order to burning airiness space of formation, basket bottom, the aperture of said network of micropores is 200 orders ~ 300 orders
Another technical scheme of the present invention is to provide a kind of device of quick manufacturing white active rice husk ash; Comprise body of heater and burn basket, burner hearth two sides of said body of heater are provided with electrical heating element, and said burning basket is placed in the burner hearth of body of heater; Said body of heater one side is provided with the adjustable blast inlet; The opposite side of said body of heater is provided with heat radiation air outlet, and the top of said body of heater is provided with temperature controller, and the signal input part of the said temperature controller thermocouple temperature sensor interior with being arranged on burner hearth is connected; The signal output part of said temperature controller is connected with electrical heating element, with the heating of control electrical heating element.
In one embodiment; Above-mentioned adjustable blast inlet comprises the can slide up and down first air intake sliding door and the second air intake sliding door; The said first air intake sliding door and the second air intake sliding door are for being arranged side by side up and down; Said adjustable blast inlet top also is provided with exhaust outlet, and said exhaust outlet is provided with openable air draft dividing plate, and said air draft dividing plate is provided with the aperture that rice hull ash can't be blown out.
In one embodiment, above-mentioned heat radiation air outlet lower part is provided with fixedly shrouding, and its upper part is provided with the ventilation sliding door that can slide up and down out, saidly goes out ventilation sliding door and is provided with the aperture that rice hull ash can't be blown out, in order to heat radiation.
In one embodiment; Above-mentioned burning basket comprises high temperature resistant support and is coated on the network of micropores on the high temperature resistant support; Be provided with to the leg that extends below around the said high temperature resistant support, in order to burning airiness space of formation, basket bottom, the aperture of said network of micropores is 200 orders ~ 300 orders.
In one embodiment, the above-mentioned first air intake sliding door, the second air intake sliding door and go out to be provided with door handle on the ventilation sliding door.
The invention has the advantages that:
1, this device can make the heat that the rice husk incendiary is produced in the burner hearth dissipate rapidly through airiness;
2, this device provides a stable burning situation, and inlet that can control air, and it is too fast to avoid heat to dissipate, and farthest avoids by electric energy thermal environment being provided, thereby has practiced thrift electric energy; Can prevent that also the rice husk burning from too acutely causing fire box temperature too high, makes soft silica be converted into crystal form silicon-dioxide;
The burning degree that 3, just can reflect rice hull ash through the changing conditions of observing fire box temperature;
4, guarantee evenly fully burning of rice husk, loss is few.
5, rice husk is carried out pre-treatment after, the rice husk combustionvelocity is accelerated, the impurity of rice hull ash is lower, color and luster is whiter.Content through detecting soft silica is also higher relatively, reaches 93%.
The rice hull ash that the present invention produces is through measuring; Its chemical ingredients and comparison sample silicon ash (the silicon ash that Xining ferroalloy works produce; SiO2 content is more than or equal to 93%, and particle diameter is 0.1 ~ 0.2um) approaching, and wherein dioxide-containing silica can be known all more than 93% through the fluorescent chemicals analysis; And both XRD figure spectral curves and crest value are very close, are soft silica; Through to the rice hull ash ball milling, can access the powder of median size about 5.9 μ m.
Description of drawings
Fig. 1 is the device perspective view of the quick manufacturing white active rice husk ash among the embodiment.
Fig. 2 is the structural representation of adjustable blast inlet among the embodiment.
Fig. 3 is the structural representation of heat radiation air outlet among the embodiment.
Label declaration: 1-body of heater 2-burns basket 3-adjustable blast inlet 4-electrical heating element 5-heat radiation air outlet 6-temperature controller 7-door handle 8-air draft dividing plate 9-thermocouple temperature sensor
2.1 the shrouding 5.2 of-high temperature resistant support 2.2-network of micropores 3.1-the first air intake sliding door 3.2-the second air intake sliding door 5.1-fixedly-go out ventilation sliding door.
Embodiment
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and conjunction with figs., elaborate as follows, but the present invention is not limited to this.
The method of quick manufacturing white active rice husk ash of the present invention, this method is carried out according to the following steps:
(1) rice husk is carried out dilute acid pretreatment (hydrochloric acid, nitric acid), the mass ratio of the water acid of pretreatment fluid is at 5 ~ 15:1, and pretreatment time is 2 ~ 24 hours;
(2) rice husk after the dilute acid pretreatment need adopt clear water to carry out repeatedly clean, is generally 2 ~ 3 times, and removes the impurity in the rice husk;
(3) will clean rice husk later and directly put in the burning basket, and place 600 ℃ of bodies of heater that set in advance to burn, before rice husk is put into body of heater, open air outlet and blast inlet, and according to combustionvelocity and rice husk amount adjustment turnover wind exhaust air rate.Temperature controller, thermopair and wire spiral are used, and can monitor stove internal combustion temperature in real time, temperature in the adjustment stove, controlling resistance silk power supply.Originally the rice husk combustionvelocity is very fast, and temperature can raise automatically in the stove, and wire spiral need not the energising heating.After thermocouple monitoring temperature in the stove surpasses 750 ℃, reduce the air flow of inlet and outlet at once, open the top exhaust outlet of blast inlet simultaneously.Let warm air in the circulation of stove inner top, accelerate heat radiation, reduce the rice husk rate of combustion, thereby play the temperature control effect.Pass through acid-treated rice husk in addition, its internal microstructure changes, and heat radiation is fast with the more unpretreated rice husk of firing rate, therefore utilizes present method, can produce white rice hull ash fast;
(4) will burn basket and take out, and adopt pulverizer or ball mill that rice hull ash is carried out grinding or ball milling again, and make its median size be controlled at 5 ~ 7 μ m, preferred median size is controlled to be 5.9 μ m.
Another technical scheme of the present invention is to provide a kind of device of quick manufacturing white active rice husk ash; Comprise body of heater 1 and burn basket 2, said body of heater 1 is the insulation roasting kiln, and burner hearth two sides of said body of heater 1 are provided with electrical heating element 4; Said burning basket 2 is placed in the burner hearth of body of heater 1; Said body of heater 1 one sides are provided with adjustable blast inlet 3, and the opposite side of said body of heater 1 is provided with heat radiation air outlet 5, and the top of said body of heater 1 is provided with temperature controller 6; The signal input part of said temperature controller 6 thermocouple temperature sensor 9 interior with being arranged on burner hearth is connected; The signal output part of said temperature controller 9 is connected with electrical heating element 4, and with 4 heatings of control electrical heating element, said electrical heating element 4 can be resistive heater or heating tube etc.Adjustable inlet and outlet of the present invention design can be carried out the control of rate of air circulation to constantly different and different rice husk burning amount, also can through with being used of inlet and outlet, adjustment heat dissipative velocity, thus play the temperature control effect.Through controlling resistance silk heating installation, temperature controller and turnover general mood, can control the interior temperature of burner hearth within claimed range, and the temperature in the monitoring rice husk combustion processes.
In the present embodiment; Above-mentioned burning basket 2 comprises high temperature resistant support 2.1 and is coated on the network of micropores 2.2 on the high temperature resistant support 2.1; Be provided with to the leg that extends below around the said high temperature resistant support 2.1; In order to burning airiness space of formation, basket bottom, the aperture of said network of micropores 2.2 is 200 orders ~ 300 orders.Burn basket and be made, burn basket and all adopt high temperature material with holes to make all around, both can prevent that rice husk from losing too much in combustion processes, also can strengthen the air contact area, improve circulation speed by high temperature resistant non-metallic material.
In the present embodiment; Above-mentioned adjustable blast inlet 3 comprises the can slide up and down first air intake sliding door 3.1 and the second air intake sliding door 3.2, and the said first air intake sliding door 3.1 and the second air intake sliding door 3.2 are for being arranged side by side up and down, and said adjustable blast inlet top also is provided with exhaust outlet; Said exhaust outlet is provided with openable air draft dividing plate 8; Opening ways can the slide down dynamic formula, also can be convertible, and said air draft dividing plate 8 is provided with the aperture that rice hull ash can't be blown out.
In the present embodiment, above-mentioned heat radiation air outlet 5 lower parts are provided with fixedly shrouding 5.1, and its upper part is provided with the ventilation sliding door 5.2 that can slide up and down out, saidly go out ventilation sliding door 5.2 and are provided with the aperture that rice hull ash can't be blown out, in order to heat radiation.
In the present embodiment, the above-mentioned first air intake sliding door 3.1, the second air intake sliding door 3.2 and go out on the ventilation sliding door 5.2 and be provided with door handle 7.
Present method is produced the method for white active rice husk ash, and limitation is little, and treatment solution concentration and treatment time require loose; Analysis can obtain through the XRD image; Pre-treatment has reduced the susceptibility of rice husk and temperature, and is also few to the restriction of fire box temperature, can be controlled at 600 ~ 850 ℃.Apparatus of the present invention it form simply, can the appropriate reconstruction that popular retort furnace in the market carries out inlet and outlet be got final product.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. a method of making white active rice husk ash fast is characterized in that, carries out according to the following steps:
(1) rice husk is carried out dilute acid pretreatment, pretreatment time is 2 ~ 24 hours;
(2) rice husk after the dilute acid pretreatment need carry out repeatedly clean, and removes the impurity in the rice husk;
(3) will clean rice husk later and directly put in the burning basket, and place body of heater to burn, the fire box temperature of body of heater is controlled at 600 ℃ ~ 800 ℃; Produce rice hull ash; Its amorphous silica content is more than 90%, and color and luster is white in color and is evenly distributed, the loose accumulation of rice hull ash;
(4) will burn basket and take out, again rice hull ash carried out grinding or ball milling, and make its median size be controlled at 5 ~ 7 μ m.
2. the method for quick manufacturing white active rice husk ash according to claim 1; It is characterized in that said body of heater one side is provided with the adjustable blast inlet, the opposite side of said body of heater is provided with heat radiation air outlet; The top of said body of heater is provided with temperature controller; The signal input part of the said temperature controller thermocouple temperature sensor interior with being arranged on burner hearth is connected, and the signal output part of said temperature controller is connected with electrical heating element, with the heating of control electrical heating element.
3. the method for quick manufacturing white active rice husk ash according to claim 1; It is characterized in that; Said adjustable blast inlet comprises the can slide up and down first air intake sliding door and the second air intake sliding door, and the said first air intake sliding door and the second air intake sliding door are for being arranged side by side up and down, and said adjustable blast inlet top also is provided with exhaust outlet; Said exhaust outlet is provided with openable air draft dividing plate, and said air draft dividing plate is provided with the aperture that rice hull ash can't be blown out.
4. the method for quick manufacturing white active rice husk ash according to claim 1, it is characterized in that: said heat radiation air outlet lower part is provided with fixedly shrouding, and its upper part is provided with the ventilation sliding door that can slide up and down out.
5. the method for quick manufacturing white active rice husk ash according to claim 1; It is characterized in that: described burning basket comprises high temperature resistant support and is coated on the network of micropores on the high temperature resistant support; Be provided with to the leg that extends below around the said high temperature resistant support; In order to burning airiness space of formation, basket bottom, the aperture of said network of micropores is 200 orders ~ 300 orders.
6. device of making fast white active rice husk ash; Comprise body of heater and burn basket, burner hearth two sides of said body of heater are provided with electrical heating element, and said burning basket is placed in the burner hearth of body of heater; It is characterized in that: said body of heater one side is provided with the adjustable blast inlet; The opposite side of said body of heater is provided with heat radiation air outlet, and the top of said body of heater is provided with temperature controller, and the signal input part of the said temperature controller thermocouple temperature sensor interior with being arranged on burner hearth is connected; The signal output part of said temperature controller is connected with electrical heating element, with the heating of control electrical heating element.
7. the device of quick manufacturing white active rice husk ash according to claim 6; It is characterized in that: said adjustable blast inlet comprises the can slide up and down first air intake sliding door and the second air intake sliding door; The said first air intake sliding door and the second air intake sliding door are for being arranged side by side up and down; Said adjustable blast inlet top also is provided with exhaust outlet, and said exhaust outlet is provided with openable air draft dividing plate, and said air draft dividing plate is provided with the aperture that rice hull ash can't be blown out.
8. the device of quick manufacturing white active rice husk ash according to claim 6; It is characterized in that: said heat radiation air outlet lower part is provided with fixedly shrouding; Its upper part is provided with the ventilation sliding door that can slide up and down out; Saidly go out ventilation sliding door and be provided with the aperture that rice hull ash can't be blown out, in order to heat radiation.
9. the device of quick manufacturing white active rice husk ash according to claim 6; It is characterized in that: described burning basket comprises high temperature resistant support and is coated on the network of micropores on the high temperature resistant support; Be provided with to the leg that extends below around the said high temperature resistant support; In order to burning airiness space of formation, basket bottom, the aperture of said network of micropores is 200 orders ~ 300 orders.
10. according to the device of claim 7 or 8 described quick manufacturings white active rice husk ash, it is characterized in that: the said first air intake sliding door, the second air intake sliding door and go out to be provided with door handle on the ventilation sliding door.
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| CN2012102468888A CN102730702A (en) | 2012-07-17 | 2012-07-17 | Method and device for fast preparing white activated rice hull ash |
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| CN2012102468888A CN102730702A (en) | 2012-07-17 | 2012-07-17 | Method and device for fast preparing white activated rice hull ash |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105600794A (en) * | 2015-12-31 | 2016-05-25 | 天津中科云健康装备科技有限公司 | Porous silicon dioxide and preparation method thereof |
| CZ306226B6 (en) * | 2014-12-16 | 2016-10-12 | Technická univerzita v Liberci | Method of purifying biological waste occurring during treatment of agricultural produce characterized by high content of silicon dioxide from undesired accompanying element ions |
| CN106276923A (en) * | 2016-08-17 | 2017-01-04 | 唐汉军 | Biomass resource recycling preparation SiO2method |
| JP6389349B1 (en) * | 2018-05-21 | 2018-09-12 | 株式会社Ｍ．Ｉ．Ｔ | Multi-chamber self-burning silica production equipment |
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| CN201724258U (en) * | 2010-07-12 | 2011-01-26 | 王全红 | Fire coal and biomass gasification furnace |
| CN202032889U (en) * | 2011-02-16 | 2011-11-09 | 星光树脂制品（昆山）有限公司 | Coating sintering furnace with peeling claw |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ306226B6 (en) * | 2014-12-16 | 2016-10-12 | Technická univerzita v Liberci | Method of purifying biological waste occurring during treatment of agricultural produce characterized by high content of silicon dioxide from undesired accompanying element ions |
| CN105600794A (en) * | 2015-12-31 | 2016-05-25 | 天津中科云健康装备科技有限公司 | Porous silicon dioxide and preparation method thereof |
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| JP6389349B1 (en) * | 2018-05-21 | 2018-09-12 | 株式会社Ｍ．Ｉ．Ｔ | Multi-chamber self-burning silica production equipment |
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Application publication date: 20121017 |