CN201296664Y - Apparatus for separating and purifying silica micro powder from electric furnace flue dust - Google Patents
Apparatus for separating and purifying silica micro powder from electric furnace flue dust Download PDFInfo
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- CN201296664Y CN201296664Y CNU2008203030475U CN200820303047U CN201296664Y CN 201296664 Y CN201296664 Y CN 201296664Y CN U2008203030475 U CNU2008203030475 U CN U2008203030475U CN 200820303047 U CN200820303047 U CN 200820303047U CN 201296664 Y CN201296664 Y CN 201296664Y
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- electric furnace
- separating
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- flue
- cooling tower
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Abstract
The utility model discloses an apparatus for separating and purifying silica micro powder from electric furnace flue dust, which includes a smoke pipeline (1) of electric furnace. The utility model is characterized in that: the smoke pipeline (1) is connected with a gravity cyclone dust collector (2), the gravity cyclone dust collector (2) is connected with a smoke cooling tower (3) by a pipe, the smoke cooling tower (3) is connected with a smoke purifying chamber (4); the PLC pulse ash removal device of the smoke purifying chamber (4) is connected with a vortex centrifuge (7); and the vortex centrifuge (7) is connected with a powder storage pot (8). The technology in the utility model can catch more subnano ultrafine particles effectively, and separate carbon granule with larger particle size and dust with larger specific gravity effectively; the recovered silica micro powder has a ultrafine micro granular form bead structure without crystal, is an amorphous nonmetallic mineral inorganic material, achieves excellent properties of reinforcing, dispersing, water segregating, insulating, delustring, thixotroping, penetrating and thick mixing; and has volcano ash active index as 86-110%.
Description
Technical field
The utility model relates to a kind of device of separating and purifying silicon dioxide micropowder from electric furnace dust, belongs to electric furnace dust recovery and utilization technology field.
Background technology
The metallurgical high energy consumption of electric furnaces such as iron alloy, industrial silicon, corundum and calcium carbide smelting enterprise produces a large amount of flue gas, flue dust during production.According to incompletely statistics, there are electric furnace smelter nearly four over thousands of families in the whole nation.Throughput is: 2,300 ten thousand tons in iron alloy (1,740 ten thousand tons of actual productions), 1,200,000 tons of industrial silicons (800,000 tons of actual productions), 2,400,000 tons in corundum (1,760,000 tons of actual productions), 1,800,000 tons on calcium carbide (2,300,000 tons of actual productions have partly the iron alloy electric furnace calcium carbide of changing the line of production).Year produces 5,600,000 tons of electric furnace dusts, becomes the source of environmental pollution.Though most of enterprise all auxiliary construction environmental protection installation, mostly be simple solution electric furnace smoke prevention and dust control, with regard to environmental protection and environmental protection, the flue dust of collection all is that outer abandoning stacked or buried basically, causes serious secondary pollution; The environmental protection facility that part enterprise arranged is also adopting officially eliminated by the State old technology, and efficiency of dust collection is not high, and the enterprise that has simply does things simply and thriftily, and environmental protection facility is built on the ground of assuming a feigned manner, and time stops when opening, and deals with green audit.Causing above-mentioned reason is that environmental protection facilities of the enterprise need drop into substantial contribution, and the working cost of equipment is higher, increases enterprise product cost.The flue dust quality that reclaims does not reach professional user's requirement, and the fume amount of individual enterprise is less relatively, is difficult to tissue in batches, enterprise can not carry out marketing network at this point, can only take over the land for use and bury, and causes enterprise's production cost further to increase, enterprise has only expenditure, not income.There is resentment in enterprise to running environment protection equipment.
Summary of the invention
The purpose of this utility model is: provide a kind of and can reclaim the flue dust that metallurgical electric furnace produces, fully utilize, turn harm into good, turn waste into wealth, and obtain a kind of device of separating and purifying silicon dioxide micropowder from electric furnace dust of new resources, to overcome the deficiencies in the prior art.
The device of separating and purifying silicon dioxide micropowder from electric furnace dust of the present utility model, it comprises the flue of electric furnace, flue connects the gravity tornado dust collector, the gravity tornado dust collector are by the pipe connection smoke cooling tower, smoke cooling tower connects the gas cleaning chamber, the PLC pulse ash remover of gas cleaning chamber connects the eddy current separating centrifuge, and the eddy current separating centrifuge connects the powder hold tank.
The device of above-mentioned separating and purifying silicon dioxide micropowder from electric furnace dust, smoke cooling tower are connected with water circulating pump, circulating water pool and water cooling tower.
The device of above-mentioned separating and purifying silicon dioxide micropowder from electric furnace dust, the flue pipeline of gas cleaning chamber is connected with chimney with induced draft fan.
The device of above-mentioned separating and purifying silicon dioxide micropowder from electric furnace dust is provided with cooling trough 12 in the smoke cooling tower, flue passes cooling trough.
Discover that through the applicant existing dust collecting process can only satisfy the gas cleaning requirement of electric furnace metallurgy, but the flue dust of its recovery is not considered to be used.And the impure height of flue dust of existing technology recovery, utility value is low.
Electric furnace dust described in the utility model, be meant in the flue gas that metallurgical electric furnaces such as iron alloy, industrial silicon, corundum and calcium carbide produce with flue dust.The flue dust mechanism of production is as follows:
The hot stove manufacture silicon in the ore deposit, in the smelting process of Si system alloy, the main raw material of its use is quartzy stone ore, silicon ore deposit, silicon gravel and sillimanite, and mineral contain silicon-dioxide 97 ~ 99.20%, and reductive agent is a carbon raw material, and the required heat that reduces is provided by electric energy.Silicon-dioxide is the highly stable material of a kind of chemical bond, and the silicon of metallic state and oxygen have extremely strong avidity, and the reductor of Chang Zuowei steel-making uses.Silicon combines generation silicon carbide with carbon under lower temperature, become the agent of iron and steel water deoxygenation and the scavenging agent of steel-making, foundry industry, and silicon is again the alloying constituent of producing electrical steel, casting alloy simultaneously, the reductive agent of precious metals such as production MAGNESIUM METAL, molybdenum-iron.Because the physicochemical property of silicon-dioxide is highly stable, need high temperature ability decomposition-reduction.High temperature, high-intensity smelting reducing condition that existing smelting process has only ore-smelting furnace just may provide it to need.
Electric furnace conducts electricity in stove by specialized apparatus, and the strength of current of separate unit electric furnace is up to 40 ~ 300KA (deciding on the furnace volume size).Electric current is through in the electrode special guiding stove, and in the electrode tip discharge, it is lonely to form electricity, produces electron ion gas, and its discharge temp is up to 2353 ~ 7253K °.Mineral are under the haughty and aloof temperature effect of electricity, at first decompose the intermediate product silicon monoxide metallic vapor that generates gas phase, gas rises and contacts with furnace charge, adsorbed by furnace charge and produce the indirect reduction reaction, the small liquid grain of the alloy of formation reaction product silicon or silicon, along with the time lengthening of reaction, small liquid grain forms the droplet settling furnace bottom gradually, and the initial temperature of Si reduction is 2026K °.In the reduction process, there is 10 ~ 15% silicon monoxide gas to be participated in reaction approximately by furnace charge absorption, high-temperature furnace gas effusion furnace charge with the reduction generation, combine with airborne oxygen on the fire door surface, produce reaction, redox becomes silicon dioxide microparticle, and redox temperature is 653 ~ 853K °, the uncombusted carbon powder of reducing agent that particulate and high-temperature furnace gas are taken out of, mineral surface dust are formed flue dust, become atmospheric polluting material.
In the smelting process, because of reasons such as management and operating skills, under the situation of strong carbon operation or the local rich carbon of furnace charge, in the time of the about 1123K of furnace temperature °, silicon-dioxide and carbon can at first react the carbide that generates silicon, become slag components and cupola well stores and influence normal running and cycle in furnace life.The temperature that the carbide of silicon generates is not high, and destruction is separated the temperature of carbide up to 3353K °, though add the ferriferous raw material effective carbide of analysing silicon at a lower temperature, yet product has strict demand to the content of iron, do not allow on the technology, can only adopt the dry combustion method electric furnace that do not feed intake to handle furnace bottom rising.The working of a furnace is handled in the electric furnace dry combustion method can make bed of material attenuation, furnace charge adsorption efficiency and adsorption volume reduce, reaction also temperature increases sharply, the loss of the intermediate product silicon monoxide gas of accelerated reaction, furnace gas that electric furnace produces and fume amount swash speed to be increased, flue gas generating capacity 40 ~ 50% when surpassing ordinary production, and this has been that the typing environmental protection equipment does not have plentiful ability can not effectively solve one of reason of electric furnace flue gas Pollution abatement, and the carbon granules of uncombusted and dust-and enter purification system, influence the flue dust composition.
The metallurgical principal reaction equation of silicon:
SiO2+3C＝(SiC)+2CO↑
Electric furnace dust classification and character thereof are as follows:
The electric furnace Mn series alloy, the calcium carbide flue dust mainly is made up of mineral surface dust and small breeze that most carbon granules of manganese oxide, manganous sulfate and calcium oxide, magnesium oxide, silicon-dioxide and a spot of iron protoxide, possible trouble and elevated temperature heat air-flow are brought into, and particle diameter is 0.10 ~ 45 μ m.Silicon-dioxide, manganous sulfate and Calcium of intensifiens, magnesium particle particle diameter 0.10 ~ 0.394 μ m of gas phase cohesion in the flue dust, this flue dust can be improved clay matter acid soil and the excessive soil compaction phenomenon of chemical fertilizer effectively, and chessom improves the gas permeability of soil, increase soil fertility, promote the agricultural byproducts increasing both production and income.
Industrial silicon, silicon are that the iron alloy flue dust mainly is made up of the fine silica powder of the oxidation cohesion in air of the silicon monoxide metallic vapor behind the high-temperature gasification, a spot of calcium oxide, magnesium oxide, iron protoxide and sodium oxide, potassium oxide are arranged, the mineral surface dust of bringing into the unburnt carbon granules of part and high temperature gas flow.Micro mist median sizes such as silicon-dioxide 0.10 ~ 0.335 μ m, pozzolanic activity index: 86-110; Powder structure is: the no crystallization said three-dimensional body bead of cotton for wadding shape reunion.The industrial silicon flue dust contains silicon-dioxide 92 ~ 96%, and the Si system alloy flue dust contains silicon-dioxide 80 ~ 92%.
The flue dust particle diameter that existing method flue reclaims is isolated impurity such as carbon granules because of not yet in effect, or the selection mistake of filter material, and its size distribution skew is bigger.Particle size range as shown in Table 1.The flue dust particle size range that the utility model reclaims as shown in Table 2.
The existing method of table one reclaims the flue dust particle size range
Table two the utility model separates the back flue dust particle size range of purifying
By above-mentioned data as can be known, can trap the ultrafine particulate of more inferior nanomorphic effectively through the utility model technology, and the carbon granules of greater particle size effectively separates with the bigger dust of proportion, though the flue dust ratio of median diameter changes little, physical index then is greatly improved, and specific surface area increases by 45 ~ 55%.
The electric furnace silicon ash that the utility model reclaims, main component is the fine silica powder that oxidation generates in air of the silicon monoxide metallic vapor behind the high-temperature gasification in the electric furnace, pearl shape structure for the granular no xln of superfine, indefiniteness non-metallic minerals inorganic materials, has good reinforcement, dispersed, bleeding, insulativity, extinction, thixotropy and perviousness, special matter such as coagulating the soup property, pozzolanic activity index 86 ~ 110%, be that the mechanical workout mineral are beyond one's reach and irreplaceable unique physical and chemical index at all, its distinctive excellent properties is familiar with gradually by people, constantly expands its Application Areas.
The main physical and chemical index of electric furnace silicon ash that the utility model is collected
SiO
2: 90-98.0% (indefiniteness silicon oxide).
Fe
2O+CaO+MgO≤1％
Damage, loss on ignition I.L:0.8-1.5% burn
pH：2.5~6.2
Than resistance 24 * 1014 Ω mm2/m
Median size: 0.089-0.225 μ m
Specific surface area: 220-280m
2/ g
Pozzolanic activity index: 86 ~ 110%
Proportion:
Powder structure: the no crystallization said three-dimensional body bead of cotton for wadding shape reunion.
Nature unit weight: 180 ~ 220kg/m3
The content of the scope that its size distribution is depended in the quality evaluation of electric furnace silicon ash and application, pozzolanic activity index, specific surface area size and impurity carbon.Therefore, capture effectively ultrafine particulate and isolate carbon granules, dust that proportion is bigger is technological difficulties.Technology of the present utility model is by equipment such as gravity whirlwind pretreater, smoke cooling tower and eddy current separating centrifuges, can multistep separate dust and carbon granules, reduce the impurity in the active silica fume, the gas cleaning chamber of adopting can also maximum possible the nano level trickle flue dust of capture, improved the quality of electric furnace silicon ash.
Description of drawings
Accompanying drawing 1 is a structural representation of the present utility model;
Accompanying drawing 2 is the cut-away view of smoke cooling tower.
Embodiment
Embodiment of the present utility model: the flue 1 of metallurgical electric furnaces such as iron alloy, industrial silicon, corundum and calcium carbide connects gravity tornado dust collector 2, gravity tornado dust collector 2 are by pipe connection smoke cooling tower 3, smoke cooling tower 3 connects gas cleaning chamber 4, the PLC pulse ash remover of gas cleaning chamber 4 is by pipe connection high-frequency vortex separating centrifuge 7, and high-frequency vortex separating centrifuge 7 connects powder hold tank 8.
Wherein, cooling trough 12 is set in smoke cooling tower 3, flue 13 passes cooling trough 12, as shown in Figure 2.Cooling trough 12 is connected with water circulating pump 11, circulating water pool 9 and water cooling tower 10.
The flue pipeline of gas cleaning chamber 4 is connected with chimney 6 with induced draft fan 5, and flue gas after being purified can directly be discharged.
Device of the present utility model can reclaim the flue dust that electric furnace produces, and obtains active silica fume after separating.Detailed process is as follows:
The flue gas that electric furnace produces is done the spiral motion of translation from flue 1 feeding gravity whirlwind pretreater 2, under the guiding of gravity, granule is separated from flue gas gradually than big or the bigger dust of proportion, falls to ash storehouse, gravity whirlwind pretreater 2 bottoms; The lighter flue gas of remaining volume density enters the smoke cooling tower 3 of sealing with high temperature gas flow, high-temperature flue gas is volumetric shrinkage after cooling off, gas flow rate descends, part not by gravity whirlwind pretreater 2 isolating heavier carbon granules and dust in this further separation, fall to ash storehouse, smoke cooling tower 3 bottoms; The temperature of controlling flue gas simultaneously is not less than 100 ℃, avoids the water vapor dewfall in the flue gas, is stained with sticking filter bag and the flue dust that influences gas cleaning efficient and the recovery caking that makes moist influence quality, and the temperature of controlling flue gas is not higher than 245 ℃, avoids the melting loss filter bag.Through test, the optimum temps that flue gas enters gas cleaning chamber 4 is 120 ℃～165 ℃.The filtration cloth bag of gas cleaning chamber 4 is through special processing, and the filter bag cloth is chosen as glass filter cloth outer wall and presses the U.S. silk of fluorine film again, and the U.S. silk of inner-wall spraying fluorine felt suede is guaranteed filter effect, guarantees the nano level trickle flue dust of capture of maximum possible.The PLC pulse ash remover of gas cleaning chamber 4 provides source of the gas by air compressor machine, by pipeline gas cleaning chamber 4 every row filter bags are sprayed high-pressure airs, make filter bag sharply expand, shrink, cause shock oscillation, jet flow and filtered airflow are reverse simultaneously, the dust that is attached to the filter wall surface is shaken from the filter bag wall, fall to the ash collecting box under the gas cleaning chamber 4.Dust in each ash collecting box regularly draws off from unloading valve, is delivered to eddy current separating centrifuge 7 through wind-force and further decomposes.Eddy current separating centrifuge 7 carries out after high speed flies to change according to the material in the flue dust, with the molecular separation of little carbon granules in the silicon dioxide microparticle molecule of gaseous state shape and the flue dust and other infusibilityizatioies.Different substances proportion difference in the flue dust, the high velocity air that produces in flying to change at a high speed will be got rid of than the downward sedimentation of the material that weight weighs, and the material rotation of light specific gravity is risen and is blown receipts.Gaseous state shape fine silica powder top layer after eddy current separating centrifuge 7 decomposes is by the light gray look that bleaches, white than (inorganic mineral powder color standards) at 95 silicon-dioxide constituent content SiO
2More than 〉=98.5%, unit weight is lighter.With the gaseous state shape active silica fume of separating, send into powder hold tank 8 and preserve.
Claims (4)
- The device of [claim 1] a kind of separating and purifying silicon dioxide micropowder from electric furnace dust, it comprises the flue (1) of electric furnace, it is characterized in that: flue (1) connects gravity tornado dust collector (2), gravity tornado dust collector (2) are by pipe connection smoke cooling tower (3), smoke cooling tower (3) connects gas cleaning chamber (4), the PLC pulse ash remover of gas cleaning chamber (4) connects eddy current separating centrifuge (7), and eddy current separating centrifuge (7) connects powder hold tank (8).
- The device of [claim 2] separating and purifying silicon dioxide micropowder from electric furnace dust according to claim 1 is characterized in that: smoke cooling tower (3) is connected with water circulating pump (11), circulating water pool (9) and water cooling tower (10).
- The device of [claim 3] separating and purifying silicon dioxide micropowder from electric furnace dust according to claim 1 is characterized in that: the flue pipeline of gas cleaning chamber (4) is connected with chimney (6) with induced draft fan (5).
- The device of [claim 4] separating and purifying silicon dioxide micropowder from electric furnace dust according to claim 1 is characterized in that: smoke cooling tower is provided with cooling trough 12 in (3), and flue (13) passes cooling trough (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203030475U CN201296664Y (en) | 2008-12-02 | 2008-12-02 | Apparatus for separating and purifying silica micro powder from electric furnace flue dust |
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| CNU2008203030475U CN201296664Y (en) | 2008-12-02 | 2008-12-02 | Apparatus for separating and purifying silica micro powder from electric furnace flue dust |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824174B (en) * | 2010-05-13 | 2014-02-19 | 贵州海天铁合金磨料有限责任公司 | Application of active silica fume |
-
2008
- 2008-12-02 CN CNU2008203030475U patent/CN201296664Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824174B (en) * | 2010-05-13 | 2014-02-19 | 贵州海天铁合金磨料有限责任公司 | Application of active silica fume |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TU QINGMO Free format text: FORMER OWNER: GUIZHOU HAITIAN FERROALLOY ABRASIVE CO., LTD. Effective date: 20100316 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20100316 Address after: 550001, Guizhou Guiyang hi tech Zone Venture Building, attached to floor No. 2 Patentee after: Tu Qingmo Address before: 550001, Guizhou Guiyang hi tech Zone Venture Building, attached to floor No. 2 Patentee before: Guizhou Haitian Iron Alloy Abrasive Medium Co., Ltd. |
|
| DD01 | Delivery of document by public notice |
Addressee: Tu Qingmo Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice |
Addressee: Tu Qingmo Document name: Notification of Termination of Patent Right |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090826 Termination date: 20121202 |