CN113604680A - Magnesium alloy flux slag recovery equipment and recovery process thereof - Google Patents
Magnesium alloy flux slag recovery equipment and recovery process thereof Download PDFInfo
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- CN113604680A CN113604680A CN202110901985.5A CN202110901985A CN113604680A CN 113604680 A CN113604680 A CN 113604680A CN 202110901985 A CN202110901985 A CN 202110901985A CN 113604680 A CN113604680 A CN 113604680A
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- 239000002893 slag Substances 0.000 title claims abstract description 100
- 230000004907 flux Effects 0.000 title claims abstract description 93
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 55
- 238000011084 recovery Methods 0.000 title claims abstract description 34
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000011777 magnesium Substances 0.000 claims abstract description 59
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 58
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000002844 melting Methods 0.000 claims abstract description 32
- 230000008018 melting Effects 0.000 claims abstract description 31
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000002425 crystallisation Methods 0.000 claims abstract description 23
- 230000008025 crystallization Effects 0.000 claims abstract description 23
- 239000012065 filter cake Substances 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000007873 sieving Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims 1
- 239000007921 spray Substances 0.000 description 10
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 101100298222 Caenorhabditis elegans pot-1 gene Proteins 0.000 description 4
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 208000024172 Cardiovascular disease Diseases 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- 238000006703 hydration reaction Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/26—Magnesium halides
- C01F5/30—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/20—Obtaining alkaline earth metals or magnesium
- C22B26/22—Obtaining magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
- C22B7/004—Dry processes separating two or more metals by melting out (liquation), i.e. heating above the temperature of the lower melting metal component(s); by fractional crystallisation (controlled freezing)
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a magnesium alloy flux slag recovery device, which comprises a flux slag pot, a separation pot, a melting pool, a filter, a cooling crystallization tank, a separator and a chloride crystallization collection box, wherein the separation pot is arranged on the bottom of the melting pool; wherein the flux slag pot is connected with the separation pot, the melting tank, the filter, the cooling crystallization tank, the separator and the chloride crystallization collection box in sequence. The recovery process comprises the following steps: (1) crushing the magnesium alloy flux slag and removing impurities in the magnesium alloy flux slag; (2) adding the mixed chloride into a flux slag pot for melting; (3) adding into a separation pot, and separating out the upper magnesium liquid; (4) adding into a melting tank, and mixing with the thermal circulation liquid; (5) adding into a filter for filtering; (6) drying the filter cake, crushing and sieving; and adding the hot clear liquid into a cooling crystallization tank for cooling, then adding the cooled clear liquid into a separator for centrifugal separation, and recovering the cooled clear liquid to a chloride crystallization collection box. The invention has the advantages of improved safety, improved magnesium recovery rate, and high purity of recovered magnesium or magnesium alloy up to 95%.
Description
Technical Field
The invention relates to the technical field of non-ferrous metal smelting and solid waste treatment, in particular to magnesium alloy flux slag recovery equipment and a magnesium alloy flux slag recovery process.
Background
Magnesium metal and its processing products are green metal structural materials, widely used in aerospace, weaponry, vehicles, electronic communication, machine manufacturing, metal smelting, chemical production and the like, are increasingly emphasized and are rapidly developed.
The smelting of metal magnesium and the processing process thereof can generate solid waste-flux slag for magnesium smelting and magnesium alloy processing which causes great harm to the environment, and the amount of magnesium alloy flux slag discharged by each ton of magnesium or magnesium alloy is about 0.15-0.25 ton. The magnesium alloy flux slag contains various chlorides such as magnesium chloride, sodium chloride, potassium chloride and the like which are very soluble in water, can cause great harm to the environment, can enter underground water to be drunk by people and livestock after being randomly discharged, is very easy to induce cardiovascular and cerebrovascular diseases, and can cause adverse effects on agricultural production and crops. Therefore, magnesium alloy flux slag must be treated or recycled.
At present, no manufacturers are officially developed for treating the magnesium alloy flux slag in China. Small-scale manufacturers separate magnesium particles from slag by crushing and pulverization and gravity dust removal technology, recycle and smelt, and discharge the remaining flux slag at will, thus causing harm to the environment. In addition, in the process of slag crushing, part of magnesium particles are crushed into smaller particles, gravity dust removal cannot be effectively recovered, and the recovery rate is not high.
In addition, in the method for recovering the chloride in the slag by leaching after the slag is crushed and pulverized and magnesium particles in the slag are recovered, because fine magnesium particles are not recovered, the magnesium particles and water have hydration reaction in the leaching process to generate hydrogen, so that the hydrogen is ignited in the melting process, and potential safety hazards are caused.
Therefore, how to reasonably recover the magnesium alloy flux slag is a problem which needs to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention is directed to a magnesium alloy flux slag recycling apparatus and a recycling process thereof, which adopt a dry-first and wet-second treatment technique to achieve safe and sufficient recycling.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnesium alloy flux slag recovery device comprises a flux slag pot, a separation pot, a melting pool, a filter, a cooling crystallization tank, a separator and a chloride crystallization collection box; wherein the flux slag pot is connected with the separation pot, the melting tank, the filter, the cooling crystallization tank, the separator and the chloride crystallization collection box in sequence.
The working principle of the magnesium alloy flux slag recovery equipment is as follows:
the density of magnesium at 700 ℃ is 1.55g/cm3(the density of the metal such as aluminum, manganese, zinc, etc. in the magnesium alloy is slightly heavier than that of magnesium, and is about 1.6-1.75g/cm at 700 DEG C3) Lower than the mixed chloride density (about 1.8-2.0g/cm at 700 ℃ C.)3). The invention utilizes magnesium and magnesium at high temperatureThe density difference of the mixed chlorides is characterized in that the viscosity of the flux slag is reduced on the premise of increasing the temperature, and the magnesium alloy are easy to separate; then, the mixed chloride is leached with water and recovered.
Further, the magnesium alloy flux slag recovery equipment also comprises a magnesium collecting box, and the magnesium collecting box is connected with the separation pot.
The magnesium collecting box is used for collecting the magnesium liquid separated from the upper layer of the separation pot, casting the magnesium liquid into magnesium ingots, cooling and solidifying the magnesium ingots into finished products and warehousing the finished products.
Further, the magnesium alloy flux slag recovery equipment further comprises a solution circulating pump, and the solution circulating pump is arranged between the melting tank and the filter.
The beneficial effect of adopting the further technical scheme is that one function of the solution circulating pump is to add the flux slag mixture in the melting tank into the filter for filtering and separating.
Further, the magnesium alloy flux slag recovery equipment further comprises an annular spray pipe, wherein one end of the annular spray pipe is connected with an outlet of the separation pot, and the other end of the annular spray pipe is connected with the solution circulating pump.
The solution circulating pump has the beneficial effects that the solution circulating pump has the other function of blowing residual flux slag melt by using the solution flow with the pressure of 0.2-0.3MPa sprayed by the circulated 85-100 ℃ thermal circulation liquid in the melting pool through the annular spray pipe, and cooling the residual flux slag melt and then feeding the residual flux slag melt into the melting pool.
Further, the filter is a plate and frame filter.
The beneficial effect of adopting the further technical scheme is that the plate-frame filter is used for separating the flux-slag mixture to obtain a filter cake and hot clear liquid.
Further, the separator is a centrifugal separator.
The centrifugal separator has the beneficial effects that the centrifugal separator is used for removing the water in the hot clear liquid to obtain chloride crystals.
A recovery process of the magnesium alloy flux slag recovery equipment specifically comprises the following steps:
(1) crushing the magnesium alloy flux slag, and removing impurities in the magnesium alloy flux slag to obtain magnesium alloy flux slag to be treated;
(2) adding magnesium alloy flux slag to be treated and mixed chloride into a flux slag pot for melting to obtain flux slag melt;
(3) adding the flux slag melt into a separation pot, and separating out the magnesium liquid on the upper layer to obtain the residual flux slag melt;
(4) adding the residual flux slag melt into a melting tank, and mixing the residual flux slag melt with the thermal circulation liquid in the melting tank to obtain a flux slag mixture;
(5) adding the flux residue mixture into a filter for filtering to respectively obtain a filter cake and a hot clear liquid;
(6) drying the filter cake, crushing and sieving; and adding the hot clear liquid into a cooling crystallization tank for cooling, then adding the cooled clear liquid into a separator for centrifugal separation to obtain chloride crystals, and recycling the chloride crystals to a chloride crystal collection box.
Further, in the step (1), crushing to a particle size of less than 250 mm; the impurities include flake magnesium, strip magnesium, spherical magnesium, and stone, iron and slag.
Further, in the step (2), the dosage of the mixed chloride is 20-25% of the mass of the magnesium alloy flux slag to be treated.
Further, in the step (4), the temperature of the thermal cycle liquid is 85 to 100 ℃.
Further, in the step (6), the mesh number of the sieved mesh is 100 meshes; cooling to < 30 ℃.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the invention has the advantages of improved safety, improved magnesium recovery rate, and high purity of recovered magnesium or magnesium alloy up to 95%.
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 magnesium alloy flux slag recovery apparatus provided by the present invention.
Wherein, the method comprises the steps of 1-flux residue pot, 2-separation pot, 3-melting pool, 4-filter, 5-cooling crystallization tank, 6-separator, 7-chloride crystallization collecting box, 8-magnesium collecting box, 9-solution circulating pump and 10-annular spray pipe.
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 magnesium alloy flux slag recovery equipment, which comprises a flux slag pot 1, a separation pot 2, a melting pool 3, a filter 4, a cooling crystallization tank 5, a separator 6 and a chloride crystallization collection box 7, wherein the flux slag pot is arranged on the bottom of the separation pot 1; wherein the flux slag pot 1 is connected with a separation pot 2, a melting pool 3, a filter 4, a cooling crystallization tank 5, a separator 6 and a chloride crystallization collection box 7 in sequence. The working principle of the magnesium alloy flux slag recovery equipment is as follows: the density of magnesium at 700 ℃ is 1.55g/cm3(the density of the metal such as aluminum, manganese, zinc, etc. in the magnesium alloy is slightly heavier than that of magnesium, and is about 1.6-1.75g/cm at 700 DEG C3) Lower than the mixed chloride density (about 1.8-2.0g/cm at 700 ℃ C.)3). According to the invention, by utilizing the density difference of magnesium and mixed chloride at high temperature, on the premise of increasing the temperature, the viscosity of the flux slag is reduced, and the magnesium and the mixed chloride are easy to separate; then, the mixed chloride is leached with water and recovered.
In one embodiment, the magnesium alloy flux slag recovery apparatus further comprises a magnesium collection box 8, and the magnesium collection box 8 is connected with the separation pot 2. The magnesium collecting box 8 is used for collecting the magnesium liquid separated from the upper layer of the separating pot 2, casting the magnesium liquid into magnesium ingots, cooling and solidifying the magnesium ingots into finished products and putting the finished products in storage.
In one embodiment, the magnesium alloy flux slag recovery device further comprises a solution circulating pump 9, and the solution circulating pump 9 is arranged between the melting tank 3 and the filter 4. One function of the solution circulating pump 9 is to add the flux residue mixture in the melting tank 3 to the filter 4 for filtration and separation.
In one embodiment, the magnesium alloy flux slag recovery device further comprises an annular spray pipe 10, one end of the annular spray pipe 10 is connected with the outlet of the separation pot 2, and the other end of the annular spray pipe is connected with the solution circulating pump 9. The solution circulating pump 9 has another function of blowing residual flux slag melt by circulating 85-100 ℃ thermal circulation liquid in the melting pool 3 through a solution flow with the pressure of 0.2-0.3MPa sprayed by the annular spray pipe 10, cooling and then entering the melting pool.
In one embodiment, the above-mentioned filter 4 is a plate and frame filter 4. The plate and frame filter 4 is used for separating the flux slag mixture to obtain a filter cake and a hot clear liquid.
In one embodiment, the separator 6 is a centrifugal separator 6. The centrifugal separator 6 is used for removing water in the hot clear liquid to obtain chloride crystals.
The embodiment of the invention also discloses a recovery process of the magnesium alloy flux slag recovery equipment, which comprises the following steps:
(1) crushing the magnesium alloy flux slag to a particle size of less than 250mm, and removing flaky magnesium, strip-shaped magnesium, spherical magnesium, stones, iron blocks and slag to obtain magnesium alloy flux slag to be treated;
(2) adding magnesium alloy flux slag to be treated and mixed chloride into a flux slag pot 1 in a mass ratio of 4:1 for melting to obtain flux slag melt;
wherein, the waste gas generated in the melting process is pumped into a waste gas absorption system for treatment;
(3) adding the flux slag melt into a separation pot 2, and separating out the magnesium liquid on the upper layer to obtain the residual flux slag melt;
wherein, under the high temperature of 650 plus 700 ℃, the density of the magnesium and the alloy thereof is reduced, the slag viscosity is reduced, the magnesium and the alloy thereof are separated from the flux slag solution, the magnesium and the alloy thereof with low density are lifted to the upper part of the separation pot 2, the magnesium and the alloy thereof separated from the upper layer of the separation pot 2 are added into a magnesium collecting box 8 to be cast into magnesium and alloy ingots thereof, and the magnesium and the alloy ingots are cooled and solidified to be finished products to be put in storage;
(4) adding the residual flux slag melt into the melting tank 3, blowing the residual flux slag melt by a solution circulating pump 9 through circulating 85-100 ℃ thermal circulation liquid in the melting tank 3 by using a solution flow with the pressure of 0.2-0.3MPa sprayed out by an annular spray pipe 10, cooling, and then feeding into the melting tank, wherein chloride in the residual flux slag melt is mixed with the thermal circulation liquid with the temperature of 85-100 ℃ in the melting tank 3 due to the circulating outflow and the entry of the solution circulating pump 9 to obtain a flux slag mixture;
(5) pumping out the flux slag mixture by a solution circulating pump 9, and feeding the flux slag mixture into a heat-insulating plate and frame filter 4 for filtering to respectively obtain a filter cake and a hot clear liquid;
(6) washing the filter cake to wash out residual magnesium chloride, sodium chloride and potassium chloride in the filter cake, stopping washing when the total chloride is less than 0.5g/L, discharging the filter cake, naturally drying, and crushing to 100 meshes, wherein the filter cake is used as a flue gas desulfurizer or a denitrifier, and can also be used for processing a refractory material or a high-grade magnesium salt product;
adding the hot clear liquid of 85-100 deg.C into a cooling crystallization tank 5, cooling to less than 30 deg.C, adding into a separator 6, centrifuging to obtain chloride crystal, recovering to a chloride crystal collecting box 7, evaporating, and dehydrating for production 2#Magnesium and magnesium alloy fluxes.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the invention has the advantages of improved safety, improved magnesium recovery rate, and high purity of recovered magnesium or magnesium alloy up to 95%.
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 magnesium alloy flux slag recovery device is characterized by comprising a flux slag pot, a separation pot, a melting pool, a filter, a cooling crystallization tank, a separator and a chloride crystallization collection box;
the flux slag pot is sequentially connected with the separation pot, the melting pool, the filter, the cooling crystallization tank, the separator and the chloride crystallization collection box.
2. The magnesium alloy flux slag recovery apparatus as claimed in claim 1, further comprising a magnesium collection tank connected to the separation pot.
3. The magnesium alloy flux slag recovery apparatus as claimed in claim 2, further comprising a solution circulation pump provided between the melting tank and the filter.
4. The magnesium alloy flux slag recovery apparatus as claimed in claim 3, further comprising an annular nozzle, one end of which is connected to an outlet of the separation pot and the other end of which is connected to the solution circulation pump.
5. A magnesium alloy flux slag recovery apparatus as claimed in any one of claims 1 to 4, wherein said filter is a plate and frame filter; the separator is a centrifugal separator.
6. A recovery process of a magnesium alloy flux slag recovery apparatus as set forth in claim 1, comprising the steps of:
(1) crushing the magnesium alloy flux slag, and removing impurities in the magnesium alloy flux slag to obtain magnesium alloy flux slag to be treated;
(2) adding magnesium alloy flux slag to be treated and mixed chloride into a flux slag pot for melting to obtain flux slag melt;
(3) adding the flux slag melt into a separation pot, and separating out the magnesium liquid on the upper layer to obtain the residual flux slag melt;
(4) adding the residual flux slag melt into a melting tank, and mixing the residual flux slag melt with the thermal circulation liquid in the melting tank to obtain a flux slag mixture;
(5) adding the flux residue mixture into a filter for filtering to respectively obtain a filter cake and a hot clear liquid;
(6) drying the filter cake, crushing and sieving; and adding the hot clear liquid into a cooling crystallization tank for cooling, then adding the cooled clear liquid into a separator for centrifugal separation to obtain chloride crystals, and recycling the chloride crystals to a chloride crystal collection box.
7. A recycling process according to claim 6, characterized in that in step (1), said grinding is carried out to a particle size of < 250 mm; the impurities include flake magnesium, strip magnesium, spherical magnesium, and stones, iron nuggets, and slag.
8. A recycling process according to claim 6, characterized in that in step (2), the amount of said mixed chloride is 20-25% of the mass of the magnesium alloy flux slag to be treated.
9. A recycling process according to claim 6, characterized in that in step (4), the temperature of said hot recycle liquid is 85-100 ℃.
10. A recycling process according to claim 6, wherein in step (6), the screened mesh number is 100; the cooling is to < 30 ℃.
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