CN112742851A - Treatment device and treatment process for Pidgeon magnesium smelting reducing slag - Google Patents
Treatment device and treatment process for Pidgeon magnesium smelting reducing slag Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 178
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000011777 magnesium Substances 0.000 title claims abstract description 62
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000008569 process Effects 0.000 title claims abstract description 36
- 238000003723 Smelting Methods 0.000 title claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 102
- 238000003860 storage Methods 0.000 claims abstract description 73
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 230000009467 reduction Effects 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 19
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 9
- 239000011490 mineral wool Substances 0.000 claims abstract description 8
- 239000000047 product Substances 0.000 claims description 62
- 239000000428 dust Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 17
- 239000010881 fly ash Substances 0.000 claims description 14
- 230000005484 gravity Effects 0.000 claims description 14
- 239000002918 waste heat Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 239000002956 ash Substances 0.000 claims description 11
- 238000004806 packaging method and process Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000004537 pulping Methods 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 26
- 239000000654 additive Substances 0.000 abstract description 3
- 238000007873 sieving Methods 0.000 abstract description 3
- 238000006722 reduction reaction Methods 0.000 description 25
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 19
- 239000000395 magnesium oxide Substances 0.000 description 14
- 230000009286 beneficial effect Effects 0.000 description 7
- 238000012856 packing Methods 0.000 description 6
- 238000012216 screening Methods 0.000 description 6
- 235000012241 calcium silicate Nutrition 0.000 description 5
- 229910052918 calcium silicate Inorganic materials 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 229910000514 dolomite Inorganic materials 0.000 description 3
- 239000010459 dolomite Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
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- 238000010248 power generation Methods 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000004100 electronic packaging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a treatment device of reducing slag for smelting magnesium by Pidgeon process, comprising: the device comprises a reducing slag charging barrel, a cooling machine, a primary sieve barrel, a secondary sieve barrel, a sieved reducing slag powder storage bin, a tubular ball mill and a finished product reducing slag powder storage bin; the treatment process comprises the following steps: (1) sending the reducing slag into a cooler through a reducing slag charging barrel, and then introducing cold air for cooling; (2) sequentially passing through a primary sieve drum and a secondary sieve drum, and then sending into a sieving reduction slag powder storage bin; (3) and (4) feeding the mixture into a tubular ball mill, grinding the mixture, and feeding the ground mixture into a finished product reduction slag powder storage bin to obtain a finished product reduction slag powder. The invention recovers the heat energy of the hot reducing slag discharged from the reducing furnace, separates the reducing slag in the process of recovering the heat energy, finely grinds the reducing slag with low magnesium content, and simultaneously adds cement clinker or other additives to be mixed and ground into cement; the reducing slag with high magnesium content is processed into mineral wool or light magnesium oxide finished products, so that the magnesium reducing slag resource is recycled and reused scientifically and in high value.
Description
Technical Field
The invention relates to the technical field of recycling and reusing of solid wastes in the metallurgical industry, in particular to a device and a process for treating reducing slag in Pidgeon magnesium smelting.
Background
Magnesium, a density of 1.738g/cm3The light metal element has small density, and the specific strength and specific rigidity are higher than those of common conventional metal structural materials, so the light metal element is widely applied to the fields of aerospace, weaponry, electronic communication, vehicles, metallurgy, electronic technology and the like, and is an energy-saving environment-friendly green metal which is generally accepted all over the world at present.
At present, China is the biggest magnesium metal producing country all over the world, and the magnesium metal yield of China is 85-100 ten thousand tons, and accounts for about 80% -85% of the total yield all over the world. The production of magnesium metal in China is completely carried out by adopting a Pidgeon process thermal reduction process, the raw materials for producing the magnesium metal are dolomite containing magnesium carbonate, calcium carbonate and the like, the reducing agent is ferrosilicon alloy containing 75% of silicon and containing about 25% of iron, the dolomite and the ferrosilicon after being melted and burnt are mixed in proportion to prepare pellets, the pellets are roasted and reduced under the vacuum condition, and the magnesium is collected after being reduced and then refined to obtain the magnesium product. In the reduction process of magnesium, dolomite is roasted to obtain oxides of calcium and magnesium, magnesium oxide generates magnesium steam after reduction because the reducibility of magnesium is greater than that of calcium, magnesium metal products are formed in a cold condition, silicon in a ferrosilicon reducing agent takes oxygen in magnesium oxide to convert the oxygen into silicon dioxide and residual calcium oxide to form dicalcium silicate ore phases similar to main components of cement, and the dicalcium silicate ore phases are indispensable important components in the cement products.
However, in the reduction of metallic magnesium, the conditions of the raw material and ferrosilicon, the temperature, the degree of vacuum, the reduction time, the quality of the reduced raw material during the reduction reaction, the temperature distribution of the reduced raw material in the reduction apparatus, and the like all determine the reduction conditions.
By combining the factors, the quality of the reducing slag discharged by various manufacturers at present is greatly different due to the differences of the regions, the atmosphere and the quality of the raw materials, the operation level and the concept of operation and management personnel in domestic Pidgeon magnesium metal enterprises. According to the national cement standard, the content of magnesium oxide in the cement clinker is not more than 5%, most manufacturers maintain about 5% in the actual production, and the content of magnesium oxide in most manufacturers is more than 9%. In cement products, magnesium oxide is hydrated after cement components are hydrated, but different from calcium oxide and other components, magnesium oxide is crystallized after hydration and is transformed, expansion and collapse are generated in the transformation process, so that concrete has serious quality accidents, and the content of magnesium oxide is the most important factor of cement quality except other reasons.
Therefore, how to recycle the magnesium smelting reducing slag by the Pidgeon process is good, how to recycle the magnesium smelting reducing slag by the Pidgeon process which is green, energy-saving, environment-friendly and efficient for cement products, and how to reduce the content of magnesium oxide in the reducing slag is the key.
Disclosure of Invention
In view of the above, the present invention aims to provide a treatment apparatus and a treatment process for reducing magnesium smelting slag by pijiang method, so as to reduce the content of magnesium oxide in the magnesium smelting reducing slag by pijiang method, and reasonably recycle the magnesium oxide for recycling, so as to solve the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment device for reducing slag in Pidgeon magnesium smelting comprises: the device comprises a reducing slag charging barrel, a cooling machine, a primary sieve barrel, a secondary sieve barrel, a sieved reducing slag powder storage bin, a tubular ball mill and a finished product reducing slag powder storage bin; wherein, the outlet end of the reducing slag charging barrel is sequentially connected with the cooler, the first-level sieve barrel, the second-level sieve barrel, the sieved reducing slag powder storage bin, the tubular ball mill and the finished product reducing slag powder storage bin.
The method has the beneficial effects that the reducing slag with the temperature of over 1000 ℃ is slowly cooled by cold air through the cooler, most heat in the reducing slag is absorbed, the reducing slag with high magnesium content keeps the original state and is not pulverized in the slow cooling process, reducing slag particles with low magnesium content are pulverized into powder, then the powder is sieved through a primary sieve cylinder and a secondary sieve cylinder, and the powder is ground through a tubular ball mill to obtain finished reducing slag powder with low magnesium content and small particle size, so that the finished reducing slag powder is used for preparing high-quality cement.
Further, the processing apparatus further includes: clinker storage, fly ash storage, mixture belt, large-inclination-angle belt conveyor, finished product storage and packaging machine; wherein, the finished product reducing slag powder storage bin, the clinker storage bin and the fly ash storage bin are sequentially arranged above the mixture belt; the large-inclination-angle belt conveyor is arranged at the tail end of the mixture belt; the finished product storage bin and the packaging machine are sequentially arranged at the tail end of the large-inclination-angle belt conveyor.
The method has the beneficial effects that the finished product of the magnesium reducing slag cement product or the cementing material product is obtained by mixing the finished product of the reducing slag powder, the clinker and the fly ash and then packaging the finished product by a large-inclination-angle belt conveyor and a packaging machine.
Further, the processing apparatus further includes: the system comprises a gravity dust removal chamber, a waste heat boiler, a boiler ash collection chamber, a bag-type dust collector, an induced draft fan and an exhaust funnel; wherein, the outlet end of the cooler is sequentially connected with the gravity dust removal chamber, the exhaust-heat boiler, the boiler dust collection chamber, the bag-type dust remover, the induced draft fan and the exhaust funnel.
The technical scheme has the advantages that the dust in the air is removed through the gravity dust removal chamber, the residual heat in the air is absorbed through the waste heat boiler, medium-low pressure steam of 0.75-1.2MPa is generated for life, medium-pressure 3.8MPa steam generated by the medium-pressure boiler of 3.8MPa is used for power generation, the residual dust in the air is removed through the boiler dust collection chamber and the bag-type dust collector, and finally the qualified tail gas is exhausted to the atmosphere through the induced draft fan and the exhaust funnel.
Furthermore, the inlet end of the cooler is provided with a cooler cold end, a cooling air inlet pipe is arranged outside the cooler cold end, and a control valve is arranged on the cooling air inlet pipe; specifically, cold air sequentially enters the cooler through the cooling air inlet pipe and the cold end of the cooler.
The cooling air inlet pipe and the control valve are used for controlling the inlet amount of cooling air, and the cold end of the cooler is used for further refrigerating.
Further, the outside of above-mentioned one-level sieve section of thick bamboo is provided with one-level sieve section of thick bamboo cover, and the outside of second grade sieve section of thick bamboo is provided with second grade sieve section of thick bamboo cover. Furthermore, the mesh number of the first-stage sieve cylinder is 5-8 meshes, and the mesh number of the second-stage sieve cylinder is 18-20 meshes; the first-stage screen drum cover and the second-stage screen drum cover are both conical.
The technical scheme has the beneficial effects that the conical primary sieve barrel cover and the conical secondary sieve barrel cover are adopted, so that the sieving and separating operation of the cooled reduced slag powder is facilitated.
The treatment process of the treatment device for the reducing slag in Pidgeon magnesium smelting specifically comprises the following steps:
(1) sending the reducing slag taken out of the reducing furnace into a cooler through a reducing slag charging barrel, and then introducing cold air for cooling to obtain cooled reducing slag powder;
(2) the cooled reduced slag powder sequentially passes through a primary sieve drum and a secondary sieve drum, and then is sent into a sieved reduced slag powder storage bin to obtain sieved reduced slag powder;
(3) and (3) feeding the screened reduction slag powder into a tubular ball mill, grinding the powder to a particle size of 38-40 mu m, and feeding the powder into a finished reduction slag powder storage bin to obtain a finished reduction slag powder.
Further, the treatment process also comprises the step (4): and (3) metering and placing the materials in the finished product reduction slag powder storage bin, the clinker storage bin and the fly ash storage bin on a mixed material belt, conveying the materials to the finished product storage bin by a large-inclination-angle belt conveyor, packaging the materials into a finished product bag by a packaging machine, and warehousing the finished product bag.
The further technical scheme has the beneficial effects that as the main component in the reducing slag is calcium silicate and free calcium oxide in clinker is also needed to be used as an excitant, the treatment process does not need large-storage homogenization and aging for a long time, the process is simplified, equipment is simplified, and the investment is reduced.
Further, the treatment process also comprises the step (5): and (3) sending the air which absorbs the heat of the reducing slag in the cooler into a gravity dust removal chamber, a waste heat boiler, a boiler ash collection chamber, a bag-type dust remover, an induced draft fan and an exhaust funnel in sequence, and then discharging the air into the atmosphere.
Further, the treatment process also comprises the step (6): adding unscreened reduced slag powder sieved by the primary sieve barrel and the secondary sieve barrel into an electroslag furnace, heating to 1480-1600 ℃, melting, blowing the mixture into fibers by using air with the pressure of 0.1-0.2MPa, and extracting air by using a cylindrical sieve to obtain mineral wool;
or adding unscreened reduced slag powder sieved by the first-stage sieve cylinder and the second-stage sieve cylinder into a grinder to grind the unscreened reduced slag powder into fine powder with the particle size of less than 58 mu m, then adding water with the mass of 5-6 times of the unscreened reduced slag powder, mixing and pulping the fine powder, and filtering the mixture to obtain pulp slag and pulp; the slurry is treated with CO under the pressure of 0.8-1.0MPa and the reaction temperature of 25-30 DEG C2Reacting in the atmosphere until the pH value is less than 5h, filtering, heating the filtrate by steam, filtering again, roasting the filter residue at the temperature of 900-1000 ℃ for 2-3h, and grinding to obtain the light magnesium oxide finished product.
The further technical scheme has the beneficial effects that starch is added into the prepared mineral wool to be bonded and processed into felt belts or felt boards which can be used as heat preservation, heat insulation and sound insulation materials; the prepared cement clinker can be used for industrial production of cement; the prepared light magnesium oxide finished product can be used as rubber, plastic, silicon steel, refractory materials, medicines, electronic packaging materials and the like.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the main component of the reducing slag of magnesium smelting by Pidgeon process is dicalcium silicate similar to that in cement product, but because there is magnesium oxide harmful to cement, the invention removes the residual magnesium oxide in the reducing slag, and the magnesium reducing slag is made into qualified cement, which is an excellent measure for resource recycling.
2. The invention recovers the heat energy of the hot reducing slag discharged from the reducing furnace, separates the reducing slag with high magnesium content and low magnesium content in the process of recovering heat, finely grinds the reducing slag with low magnesium content to improve the specific surface area, simultaneously adds cement clinker or other additives (such as early strength agent or coagulant), mixes and grinds the reducing slag with high magnesium content into cement, and processes the reducing slag with high magnesium content into mineral wool or light magnesium oxide finished products, so that the magnesium reducing slag resource is recycled and reused scientifically and in high value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a treatment device for reducing slag in Pidgeon magnesium smelting provided by the invention.
The method comprises the following steps of 1-a reducing slag charging barrel, 2-a cooler, 3-a primary sieve barrel, 4-a secondary sieve barrel, 5-a sieved reducing slag powder storage bin, 6-a tubular ball mill, 7-a finished product reducing slag powder storage bin, 8-a clinker storage bin, 9-a fly ash storage bin, 10-a mixture belt, 11-a large-inclination-angle belt conveyor, 12-a finished product storage bin, 13-a packing machine, 14-a gravity dust removal chamber, 15-a waste heat boiler, 16-a boiler ash collection chamber, 17-a bag dust collector, 18-an induced draft fan, 19-an exhaust funnel, 20-a cooling air inlet pipe, 21-a cooler cold end, 22-a primary sieve barrel cover and 23-a secondary sieve barrel cover.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The embodiment of the invention discloses a treatment device of reducing slag in Pidgeon magnesium smelting, which comprises the following components as shown in figure 1: a reducing slag charging barrel 1, a cooling machine 2, a primary screening barrel 3, a secondary screening barrel 4, a screened reducing slag powder storage bin 5, a tubular ball mill 6 and a finished product reducing slag powder storage bin 7; wherein, the outlet end of the reducing slag charging barrel 1 is sequentially connected with a cooler 2, a first-level sieve barrel 3, a second-level sieve barrel 4, a sieved reducing slag powder storage bin 5, a tubular ball mill 6 and a finished product reducing slag powder storage bin 7. The invention uses the cooling machine 2 to slowly cool the reducing slag with the temperature of more than 1000 ℃ by cold air, absorbs most heat in the reducing slag, keeps the reducing slag with high magnesium content in the original state and does not pulverize in the slow cooling process, pulverizes the reducing slag particles with low magnesium content into powder, then sieves the powder through the first-stage sieve cylinder 3 and the second-stage sieve cylinder 4, grinds the powder through the tubular ball mill 6, and obtains the finished reducing slag powder with low magnesium content and smaller particle size, which is used for preparing high-quality cement.
In one embodiment, the processing device for smelting magnesium reducing slag by Pidgeon process further comprises: a clinker storage bin 8, a fly ash storage bin 9, a mixture belt 10, a large-inclination-angle belt conveyor 11, a finished product storage bin 12 and a packing machine 13; wherein, the finished product reducing slag powder storage bin 7, the clinker storage bin 8 and the fly ash storage bin 9 are sequentially arranged above the mixture belt 10; the large-inclination-angle belt conveyor 11 is arranged at the tail end of the mixture belt 10; the finished product storage bin 12 and the packing machine 13 are sequentially arranged at the tail end of the large-inclination-angle belt conveyor 11. The invention mixes the finished product of reducing slag powder, clinker and fly ash and then packages the finished product by a large-inclination-angle belt conveyor 11 and a packaging machine 13, thereby obtaining the magnesium reducing slag cement product or the cementing material product.
In one embodiment, the processing device for smelting magnesium reducing slag by Pidgeon process further comprises: the system comprises a gravity dust removal chamber 14, a waste heat boiler 15, a boiler ash collection chamber 16, a bag-type dust collector 17, an induced draft fan 18 and an exhaust funnel 19; wherein, the outlet end of the cooler 2 is connected with a gravity dust removal chamber 14, a waste heat boiler 15, a boiler ash collection chamber 16, a bag-type dust remover 17, an induced draft fan 18 and an exhaust funnel 19 in turn. The invention removes dust in air through the gravity dust removal chamber 14, absorbs residual heat in the air through the waste heat boiler 15, generates medium and low pressure steam of 0.75-1.2MPa for life, adopts medium pressure 3.8MPa steam generated by a medium pressure boiler of 3.8MPa for power generation, removes residual dust in the air through the boiler dust collection chamber 16 and the bag-type dust remover 17, and finally discharges qualified tail gas to the atmosphere through the induced draft fan 18 and the exhaust funnel 19.
In one embodiment, the inlet end of the cooler 2 is provided with a cooler cold end 21, a cooling air inlet pipe 20 is arranged outside the cooler cold end 21, and a control valve is arranged on the cooling air inlet pipe 20; specifically, the cold air enters the cooling machine 2 through the cold air inlet pipe 20 and the cooling machine cold end 21 in sequence. The invention controls the entering amount of cooling air through a cooling air inlet pipe 20 and a control valve, and further refrigerates through a cold end 21 of a cooler.
In one embodiment, the outside of the primary screening drum 3 is provided with a conical primary screening drum cover 22, and the outside of the secondary screening drum 4 is provided with a conical secondary screening drum cover 23; specifically, the mesh number of the first-stage screen cylinder 3 is 5 meshes, and the mesh number of the second-stage screen cylinder 4 is 18 meshes; in another embodiment, the primary screen cylinder 3 has a mesh size of 8 mesh and the secondary screen cylinder 4 has a mesh size of 20 mesh. The invention facilitates the sieving and separating operation of the cooled reduced slag powder through the conical primary sieve cylinder cover 22 and the conical secondary sieve cylinder cover 23.
Example 1
The treatment process of the treatment device for the reducing slag in Pidgeon magnesium smelting specifically comprises the following steps:
(1) sending the reducing slag taken out of the reducing furnace into a cooler 2 through a reducing slag charging barrel 1, and then introducing cold air for cooling to obtain cooled reducing slag powder; the inlet end of the cooler 2 is provided with a cooler cold end 21, a cooling air inlet pipe 20 is arranged outside the cooler cold end 21, a control valve is arranged on the cooling air inlet pipe 20, and cold air enters the cooler 2 through the cooling air inlet pipe 20 and the cooler cold end 21 in sequence;
(2) the cooled reduced slag powder passes through a primary sieve drum 3 with 5 meshes, a conical primary sieve drum cover 22, a secondary sieve drum 4 with 18 meshes and a conical secondary sieve drum cover 23 in sequence, and then is sent into a sieved reduced slag powder storage bin 5 to obtain sieved reduced slag powder;
(3) sending the screened reduction slag powder into a tubular ball mill 6, grinding the reduction slag powder until the particle size is 38 mu m, and sending the reduction slag powder into a finished product reduction slag powder storage bin 7 to obtain a finished product reduction slag powder;
(4) the materials in the finished product reducing slag powder storage bin 7, the clinker storage bin 8 and the fly ash storage bin 9 are measured and placed on a mixture belt 10, are conveyed to a finished product storage bin 12 by a large-inclination-angle belt conveyor 11, are packed into a finished product bag by a packing machine 13, and are put into a warehouse;
(5) the air which absorbs the heat of the reducing slag in the cooler 2 is sent to a gravity dust removal chamber 14, a waste heat boiler 15, a boiler ash collection chamber 16, a bag-type dust remover 17, an induced draft fan 18 and an exhaust funnel 19 in sequence and then discharged to the atmosphere;
(6) adding unscreened reduced slag powder sieved by the first-stage sieve cylinder 3 and the second-stage sieve cylinder 4 into an electroslag furnace, heating to 1480 ℃, melting, blowing into fibers by using air with the pressure of 0.1MPa, and exhausting by using a cylindrical sieve to obtain mineral wool.
Example 2
The treatment process of the treatment device for the reducing slag in Pidgeon magnesium smelting specifically comprises the following steps:
(1) sending the reducing slag taken out of the reducing furnace into a cooler 2 through a reducing slag charging barrel 1, and then introducing cold air for cooling to obtain cooled reducing slag powder; the inlet end of the cooler 2 is provided with a cooler cold end 21, a cooling air inlet pipe 20 is arranged outside the cooler cold end 21, a control valve is arranged on the cooling air inlet pipe 20, and cold air enters the cooler 2 through the cooling air inlet pipe 20 and the cooler cold end 21 in sequence;
(2) the cooled reduced slag powder passes through a primary sieve drum 3 with 5 meshes, a conical primary sieve drum cover 22, a secondary sieve drum 4 with 18 meshes and a conical secondary sieve drum cover 23 in sequence, and then is sent into a sieved reduced slag powder storage bin 5 to obtain sieved reduced slag powder;
(3) sending the screened reduction slag powder into a tubular ball mill 6, grinding the reduction slag powder until the particle size is 40 mu m, and sending the reduction slag powder into a finished product reduction slag powder storage bin 7 to obtain a finished product reduction slag powder;
(4) the materials in the finished product reducing slag powder storage bin 7, the clinker storage bin 8 and the fly ash storage bin 9 are measured and placed on a mixture belt 10, are conveyed to a finished product storage bin 12 by a large-inclination-angle belt conveyor 11, are packed into a finished product bag by a packing machine 13, and are put into a warehouse;
(5) the air which absorbs the heat of the reducing slag in the cooler 2 is sent to a gravity dust removal chamber 14, a waste heat boiler 15, a boiler ash collection chamber 16, a bag-type dust remover 17, an induced draft fan 18 and an exhaust funnel 19 in sequence and then discharged to the atmosphere;
(6) adding unscreened reduced slag powder sieved by the first-stage sieve cylinder 3 and the second-stage sieve cylinder 4 into a grinder to grind the unscreened reduced slag powder into fine powder with the particle size of less than 58 mu m, then adding 6 times of water by mass to mix and pulp, and filtering to obtain pulp slag and pulp; the slurry is subjected to CO at a pressure of 1.0MPa and a reaction temperature of 30 DEG C2Reacting in the atmosphere until the pH value is less than 5h, filtering, heating the filtrate by steam, filtering again, roasting the filter residue at the temperature of 1000 ℃ for 3h, and grinding to obtain the light magnesium oxide finished product.
Example 3
The treatment process of the treatment device for the reducing slag in Pidgeon magnesium smelting specifically comprises the following steps:
(1) sending the reducing slag taken out of the reducing furnace into a cooler 2 through a reducing slag charging barrel 1, and then introducing cold air for cooling to obtain cooled reducing slag powder; a cooler cold end 21 is arranged at the inlet end of the cooler 2, a cooling air inlet pipe 20 is arranged outside the cooler cold end 21, a control valve is arranged on the cooling air inlet pipe 20, and cold air enters the cooler 2 through the cooling air inlet pipe 20 and the cooler cold end 21 in sequence;
(2) the cooled reduced slag powder passes through a primary sieve drum 3 with 8 meshes, a conical primary sieve drum cover 22, a secondary sieve drum 4 with 20 meshes and a conical secondary sieve drum cover 23 in sequence, and then is sent into a sieved reduced slag powder storage bin 5 to obtain sieved reduced slag powder;
(3) sending the screened reduction slag powder into a tubular ball mill 6, grinding the reduction slag powder until the particle size is 40 mu m, and sending the reduction slag powder into a finished product reduction slag powder storage bin 7 to obtain a finished product reduction slag powder;
(4) the materials in the finished product reducing slag powder storage bin 7, the clinker storage bin 8 and the fly ash storage bin 9 are measured and placed on a mixture belt 10, are conveyed to a finished product storage bin 12 by a large-inclination-angle belt conveyor 11, are packed into a finished product bag by a packing machine 13, and are put into a warehouse;
(5) the air which absorbs the heat of the reducing slag in the cooler 2 is sent to a gravity dust removal chamber 14, a waste heat boiler 15, a boiler ash collection chamber 16, a bag-type dust remover 17, an induced draft fan 18 and an exhaust funnel 19 in sequence and then discharged to the atmosphere;
(6) adding unscreened reduced slag powder sieved by the first-stage sieve cylinder 3 and the second-stage sieve cylinder 4 into an electroslag furnace, heating to 1600 ℃, melting, blowing into fibers by using air with the pressure of 0.2MPa, and exhausting by using a cylindrical sieve to obtain mineral wool.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the main component of the reducing slag of magnesium smelting by Pidgeon process is dicalcium silicate similar to that in cement product, but because there is magnesium oxide harmful to cement, the invention removes the residual magnesium oxide in the reducing slag, and the magnesium reducing slag is made into qualified cement, which is an excellent measure for resource recycling.
2. The invention recovers the heat energy of the hot reducing slag discharged from the reducing furnace, separates the reducing slag with high magnesium content and low magnesium content in the process of recovering heat, finely grinds the reducing slag with low magnesium content to improve the specific surface area, simultaneously adds cement clinker or other additives (such as early strength agent or coagulant), mixes and grinds the reducing slag with high magnesium content into cement, and processes the reducing slag with high magnesium content into mineral wool or light magnesium oxide finished products, so that the magnesium reducing slag resource is recycled and reused scientifically and in high value.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A processing apparatus of Pidgeon process smelting magnesium reducing slag, characterized by, includes: the device comprises a reducing slag charging barrel, a cooling machine, a primary sieve barrel, a secondary sieve barrel, a sieved reducing slag powder storage bin, a tubular ball mill and a finished product reducing slag powder storage bin;
the outlet end of the reducing slag charging barrel is sequentially connected with the cooler, the primary sieve barrel, the secondary sieve barrel, the sieved reducing slag powder storage bin, the tubular ball mill and the finished product reducing slag powder storage bin.
2. The apparatus for processing reducing slag from Pidgeon magnesium smelting according to claim 1, further comprising: clinker storage, fly ash storage, mixture belt, large-inclination-angle belt conveyor, finished product storage and packaging machine;
the finished product reducing slag powder storage bin, the clinker storage bin and the fly ash storage bin are sequentially arranged above the mixture belt;
the large-inclination-angle belt conveyor is arranged at the tail end of the mixed material belt;
the finished product storage bin and the packaging machine are sequentially arranged at the tail end of the large-inclination-angle belt conveyor.
3. The apparatus for processing reducing slag from Pidgeon magnesium smelting according to claim 2, further comprising: the system comprises a gravity dust removal chamber, a waste heat boiler, a boiler ash collection chamber, a bag-type dust collector, an induced draft fan and an exhaust funnel;
the outlet end of the cooler is sequentially connected with the gravity dust removal chamber, the waste heat boiler, the boiler ash collection chamber, the bag-type dust remover, the draught fan and the exhaust funnel.
4. The device for treating reducing slag in Pidgeon magnesium smelting according to claim 3, wherein a cooler cold end is arranged at the inlet end of the cooler, a cooling air inlet pipe is arranged outside the cooler cold end, and a control valve is arranged on the cooling air inlet pipe.
5. The device for treating reducing slag from Pidgeon magnesium smelting according to claim 4, wherein a primary screen cylinder cover is arranged outside the primary screen cylinder, and a secondary screen cylinder cover is arranged outside the secondary screen cylinder.
6. The device for treating the reducing slag generated in smelting magnesium by the Pidgeon process according to claim 5, wherein the mesh number of the primary sieve cylinder is 5-8 meshes, and the mesh number of the secondary sieve cylinder is 18-20 meshes;
the first-stage screen drum cover and the second-stage screen drum cover are both conical.
7. The treatment process of the treatment device for the reducing slag from Pidgeon magnesium smelting according to any one of claims 1 to 6, is characterized by comprising the following steps:
(1) sending the reducing slag taken out of the reducing furnace into a cooler through a reducing slag charging barrel, and then introducing cold air for cooling to obtain cooled reducing slag powder;
(2) the cooled reduced slag powder sequentially passes through a primary sieve drum and a secondary sieve drum, and then is sent into a sieved reduced slag powder storage bin to obtain sieved reduced slag powder;
(3) and (3) feeding the screened reduction slag powder into a tubular ball mill, grinding the powder to a particle size of 38-40 mu m, and feeding the powder into a finished reduction slag powder storage bin to obtain a finished reduction slag powder.
8. The process for treating reducing slag from Pidgeon magnesium smelting according to claim 7, further comprising the step (4): and (3) metering and placing the materials in the finished product reduction slag powder storage bin, the clinker storage bin and the fly ash storage bin on a mixed material belt, conveying the materials to the finished product storage bin by a large-inclination-angle belt conveyor, packaging the materials into a finished product bag by a packaging machine, and warehousing the finished product bag.
9. The process for treating reducing slag from Pidgeon magnesium smelting according to claim 8, further comprising the step (5): and (3) sending the air which absorbs the heat of the reducing slag in the cooler into a gravity dust removal chamber, a waste heat boiler, a boiler ash collection chamber, a bag-type dust remover, an induced draft fan and an exhaust funnel in sequence, and then discharging the air into the atmosphere.
10. The process for treating reducing slag from Pidgeon magnesium smelting according to claim 9, characterized by further comprising the step (6): adding unscreened reduced slag powder sieved by the primary sieve barrel and the secondary sieve barrel into an electroslag furnace, heating to 1480-1600 ℃, melting, blowing the mixture into fibers by using air with the pressure of 0.1-0.2MPa, and extracting air by using a cylindrical sieve to obtain mineral wool;
or adding unscreened reduced slag powder sieved by the first-stage sieve cylinder and the second-stage sieve cylinder into a grinder to grind the unscreened reduced slag powder into fine powder with the particle size of less than 58 mu m, then adding water with the mass of 5-6 times of the unscreened reduced slag powder, mixing and pulping the fine powder, and filtering the mixture to obtain pulp slag and pulp; the slurry is treated with CO under the pressure of 0.8-1.0MPa and the reaction temperature of 25-30 DEG C2Reacting in the atmosphere until the pH value is less than 5h, filtering, heating the filtrate by steam, filtering again, roasting the filter residue at the temperature of 900-1000 ℃ for 2-3h, and grinding to obtain the light magnesium oxide finished product.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233480A (en) * | 2021-06-29 | 2021-08-10 | 郭建文 | Magnesium refining slag recovery equipment and recovery process thereof |
| CN113305134A (en) * | 2021-06-18 | 2021-08-27 | 山西中城天朗环保工程有限公司 | Magnesium reducing slag recovery equipment and recovery process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113305134A (en) * | 2021-06-18 | 2021-08-27 | 山西中城天朗环保工程有限公司 | Magnesium reducing slag recovery equipment and recovery process thereof |
| CN113305134B (en) * | 2021-06-18 | 2024-09-06 | 山西中城天朗环保工程有限公司 | Magnesium reduction slag recovery equipment and recovery process thereof |
| CN113233480A (en) * | 2021-06-29 | 2021-08-10 | 郭建文 | Magnesium refining slag recovery equipment and recovery process thereof |
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