CN114013058A - Method for producing rock wool board by comprehensively utilizing solid wastes - Google Patents
Method for producing rock wool board by comprehensively utilizing solid wastes Download PDFInfo
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- CN114013058A CN114013058A CN202111124762.9A CN202111124762A CN114013058A CN 114013058 A CN114013058 A CN 114013058A CN 202111124762 A CN202111124762 A CN 202111124762A CN 114013058 A CN114013058 A CN 114013058A
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- 239000011490 mineral wool Substances 0.000 title claims abstract description 61
- 239000002910 solid waste Substances 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000003723 Smelting Methods 0.000 claims abstract description 53
- 238000009713 electroplating Methods 0.000 claims abstract description 40
- 239000002893 slag Substances 0.000 claims abstract description 36
- 239000010802 sludge Substances 0.000 claims abstract description 32
- 239000010881 fly ash Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000002028 Biomass Substances 0.000 claims abstract description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000002940 repellent Effects 0.000 claims abstract description 21
- 239000005871 repellent Substances 0.000 claims abstract description 21
- 239000007822 coupling agent Substances 0.000 claims abstract description 18
- 239000000853 adhesive Substances 0.000 claims abstract description 16
- 230000001070 adhesive effect Effects 0.000 claims abstract description 16
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 14
- 229920000742 Cotton Polymers 0.000 claims abstract description 13
- 238000000197 pyrolysis Methods 0.000 claims abstract description 11
- 239000002657 fibrous material Substances 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000011347 resin Substances 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 24
- 239000000155 melt Substances 0.000 claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- -1 polysiloxane Polymers 0.000 claims description 15
- 239000000839 emulsion Substances 0.000 claims description 13
- 229920001296 polysiloxane Polymers 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 229910052593 corundum Inorganic materials 0.000 claims description 12
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 12
- 239000005011 phenolic resin Substances 0.000 claims description 11
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical group [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 11
- 229910052681 coesite Inorganic materials 0.000 claims description 10
- 229910052906 cristobalite Inorganic materials 0.000 claims description 10
- 229910052682 stishovite Inorganic materials 0.000 claims description 10
- 229910052905 tridymite Inorganic materials 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 5
- 239000004593 Epoxy Substances 0.000 claims description 4
- 238000005119 centrifugation Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 235000013399 edible fruits Nutrition 0.000 claims description 2
- 239000010902 straw Substances 0.000 claims description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000003750 conditioning effect Effects 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 18
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 14
- 239000000292 calcium oxide Substances 0.000 description 12
- 229910052804 chromium Inorganic materials 0.000 description 12
- 239000011651 chromium Substances 0.000 description 12
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical group [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 10
- 229920001568 phenolic resin Polymers 0.000 description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 3
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
- B29C67/248—Moulding mineral fibres or particles bonded with resin, e.g. for insulating or roofing board
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Fibers (AREA)
- Glass Compositions (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of solid waste recycling treatment, and discloses a method for producing rock wool boards by comprehensively utilizing solid waste. Adding smelting furnace slag, fly ash, dry electroplating sludge and biomass solid waste into a conditioning furnace, heating to 900-1200 ℃ under a vacuum condition, carrying out smelting and high-temperature pyrolysis treatment, centrifuging the obtained melt into a fibrous shape, spraying a resin adhesive, a water repellent and a coupling agent in the centrifuging process, and carrying out cotton collection, pressing, curing and slitting on the obtained fiber material to obtain the rock wool board. The method simultaneously realizes the recycling of the nickel smelting furnace slag, the fly ash, the electroplating sludge and the biomass solid waste, can realize the harmless treatment of the electroplating sludge heavy metal pollution, reduces the environmental pollution, and has good economic benefit and environmental protection benefit.
Description
Technical Field
The invention belongs to the technical field of solid waste recycling treatment, and particularly relates to a method for producing rock wool boards by comprehensively utilizing solid waste.
Background
In the smelting production of non-ferrous metals, a large amount of smelting furnace slag and ore dressing tailings are generated. The smelting slag is treated by a stockpiling method, and the stockpiled smelting slag contains metals such as magnesium, iron, nickel, copper, cobalt and the like, so that the method has high recovery value. At present, many domestic enterprises have the problems of extensive management of smelting waste slag, serious environmental pollution, large resource consumption and waste and the like. Effective recovery and comprehensive utilization of resources are not realized.
The fly ash is fine dust mainly composed of metal oxides such as iron oxide, aluminum oxide, calcium oxide, sodium oxide and the like and inorganic compounds such as silicon dioxide and the like. The fly ash piled up into the mountain causes serious waste of land resources, and metal salts in the fly ash can destroy the acid-base balance of the land and even pollute underground water. Therefore, the utilization of the fly ash as a resource has obvious economic significance and environmental protection significance.
The electroplating sludge is a precipitate which is generated in the electroplating wastewater treatment process and takes heavy metal hydroxides such as copper, chromium and the like as main components, and the components are complex. Because the electroplating wastewater has large amount, complex components, high COD and high heavy metal content, if the electroplating wastewater is discharged randomly without treatment, serious environmental pollution can be caused. A large amount of electroplating sludge is formed while the electroplating wastewater is treated, the electroplating sludge has the characteristics of high water content, high thermal stability of heavy metal components, easy migration and the like, and secondary pollution is easily caused if the electroplating sludge is not properly treated.
Patent CN 104692648A discloses a method and system for producing rock wool by comprehensively utilizing solid wastes. The rock wool board is prepared by mixing rock wool waste residue, coal gangue and cement to prepare an autoclaved waste residue block, then mixing the autoclaved waste residue block and smelting waste residue, melting at a high temperature, centrifuging at a high speed to form fibers, spraying a binder, a water repellent and a coupling agent, and then carrying out cotton accumulation, solidification and slitting. The method can comprehensively utilize solid wastes to replace the traditional basalt and dolomite for producing rock wool products. However, the fiber forming performance of the raw material composition adopted by the patent technology is poor, the raw material needs to be melted at a high temperature of more than 1500 ℃, and the uniformity and the strength of the plate are required to be further improved.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention aims to provide a method for producing rock wool boards by comprehensively utilizing solid wastes. The method can realize the comprehensive utilization and synergistic effect of the smelting furnace slag, the fly ash, the electroplating sludge and the biomass solid waste, and centrifugally form fibers at a lower melting temperature to obtain the rock wool board with good uniformity, low moisture absorption rate and high strength.
The invention also aims to provide the rock wool board prepared by the method.
The purpose of the invention is realized by the following technical scheme:
a method for producing rock wool boards by comprehensively utilizing solid wastes comprises the following steps:
(1) adding smelting furnace slag, fly ash, dry electroplating sludge and biomass solid waste into a tempering furnace, heating to 900-1200 ℃ under a vacuum condition, and carrying out smelting and high-temperature pyrolysis treatment;
(2) centrifuging the melt obtained in the step (1) into fibers, and spraying a resin adhesive, a water repellent and a coupling agent in the centrifuging process;
(3) and (3) collecting the fiber material obtained in the step (2), pressing, curing and slitting to obtain the rock wool board.
Further, the smelting slag in the step (1) means that the main component comprises SiO2、MgO、CaO、FeO、Al2O3The nickel smelting slag.
Further, the biomass solid waste in the step (1) refers to at least one of farmland straws, wood chips and fruit shells.
Further, the mass ratio of the smelting furnace slag, the fly ash, the dry electroplating sludge and the biomass solid waste in the step (1) is 1 (0.5-1) to (0.3-0.5) to (0.8-1.6).
Further, the centrifugation in the step (2) adopts a direct-connection four-roller centrifuge for centrifugation.
Further, in the step (2), the resin binder is a phenolic resin binder or a urea resin binder.
Further, the water repellent in the step (2) is a polysiloxane emulsion water repellent. The moisture absorption rate of the rock wool board can be reduced by adding the polysiloxane emulsion water repellent.
Further, the coupling agent in the step (2) is an aminosilane coupling agent or an epoxysilane coupling agent. The amino silane coupling agent or the epoxy silane coupling agent adopted by the invention can promote the combination of the phenolic resin adhesive or the urea-formaldehyde resin adhesive and the fiber material, and obviously enhance the strength of the rock wool board.
Further, the adding amount of the resin adhesive in the step (2) is 5-20% of the mass of the melt fiber; the adding amount of the water repellent is 0.5-2% of the mass of the melt fiber; the addition amount of the coupling agent is 0.1-0.5% of the mass of the melt fiber.
Further, the step (3) of collecting the cotton refers to collecting the cotton by a cotton collector, and then extruding, folding and superposing the cotton by a folding machine to form the three-dimensional rock wool layer.
A rock wool board is prepared by the method.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention does not use natural stones such as basalt, dolomite and the like as raw materials, but adopts smelting furnace slag, fly ash and electroplating sludge solid waste for replacement, and the balance of metal elements and silicon elements is adjusted by the proportion of the solid waste raw materials to obtain the high-quality rock wool fiber.
(2) The invention can realize the resource treatment and utilization of the smelting furnace slag, the fly ash, the electroplating sludge and the biomass solid waste at the same time.
(3) According to the invention, the biomass solid waste, the smelting furnace slag, the fly ash and the electroplating sludge are subjected to smelting and high-temperature pyrolysis treatment under a vacuum condition, and a part of metal oxides generate metal simple substances under the reduction action of the pyrolytic biochar, so that the smelting temperature is effectively reduced, and the fiber forming property of the melt is improved.
(4) The invention adopts the high-temperature pyrolysis reduction effect of the biomass solid waste, and can realize the harmless treatment of toxic heavy metal ions such as chromium elements in the electroplating sludge. The content of hexavalent chromium in the product is reduced to less than 1.0mg/L from 1769.8mg/L in the original electroplating sludge through detection, and the harmless treatment of the electroplating sludge heavy metal pollution is realized.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
(1) Smelting furnace slag (the smelting furnace slag of certain domestic nickel smelting plant, the main component is SiO2、MgO、CaO、FeO、Al2O3) Fly ash (the main component is SiO)2、Al2O3、Fe2O3CaO, MgO), dryDry electroplating sludge (the main component of certain domestic electroplating sewage treatment plant is SiO)2The method comprises the steps of adding compounds containing heavy metal elements such as Cr, Fe, Ni, Cu, Zn and the like and soluble salts thereof into a tempering furnace, wherein the measured value of hexavalent chromium content is 1769.8mg/L, GB/T15555.4-1995) and biomass solid waste cotton stalk particles, wherein the mass ratio of adding smelting slag, fly ash, dried electroplating sludge and biomass solid waste is 1:0.8:0.4:1.2, and then heating to 1050-1100 ℃ under a vacuum condition for smelting and high-temperature pyrolysis treatment.
(2) Centrifuging the melt obtained in the step (1) into fibers by a direct-coupled four-roller centrifuge, and spraying a phenolic resin adhesive, a polysiloxane emulsion water repellent and an aminosilane coupling agent in the centrifuging process; wherein the addition amounts of the phenolic resin adhesive, the polysiloxane emulsion water repellent and the aminosilane coupling agent are respectively 16 percent, 1 percent and 0.2 percent of the mass of the melt fiber.
(3) And (3) collecting the fiber material obtained in the step (2) by a cotton collecting machine, extruding, folding and superposing by using a folding machine to form a three-dimensional rock wool layer, pressing the obtained rock wool layer, then sending the rock wool layer into a curing furnace for curing, and slitting to obtain the rock wool board.
The rock wool board obtained in the embodiment is sampled and crushed, and the content of hexavalent chromium is measured to be 0.84mg/L according to the method of GB/T15555.4-1995. The method realizes the harmless treatment of the heavy metal pollution of the electroplating sludge.
Example 2
(1) Smelting furnace slag (the smelting furnace slag of certain domestic nickel smelting plant, the main component is SiO2、MgO、CaO、FeO、Al2O3) Fly ash (the main component is SiO)2、Al2O3、Fe2O3CaO, MgO) and dry electroplating sludge (the main component of a certain domestic electroplating sewage treatment plant is SiO2Adding compounds containing heavy metal elements such as Cr, Fe, Ni, Cu, Zn and the like and soluble salts thereof into a tempering furnace, wherein the total chromium content of a leaching solution is measured to be 1769.8mg/L, GB/T15555.4-1995) and biomass solid waste wood chips, wherein the mass ratio of adding smelting slag, fly ash, dried electroplating sludge and biomass solid waste is 1:0.5:0.5:0.8, heating to 1150-1200 ℃ under a vacuum condition, and meltingRefining and high-temperature pyrolysis treatment.
(2) Centrifuging the melt obtained in the step (1) into fibers by a direct-coupled four-roller centrifuge, and spraying a phenolic resin adhesive, a polysiloxane emulsion water repellent and an aminosilane coupling agent in the centrifuging process; wherein the addition amounts of the phenolic resin adhesive, the polysiloxane emulsion water repellent and the aminosilane coupling agent are respectively 10 percent, 0.5 percent and 0.1 percent of the mass of the melt fiber.
(3) And (3) collecting the fiber material obtained in the step (2) by a cotton collecting machine, extruding, folding and superposing by using a folding machine to form a three-dimensional rock wool layer, pressing the obtained rock wool layer, then sending the rock wool layer into a curing furnace for curing, and slitting to obtain the rock wool board.
The rock wool boards obtained in this example were sampled and crushed and the total chromium content was determined to be 0.95mg/L according to GB/T15555.4-1995. The method realizes the harmless treatment of the heavy metal pollution of the electroplating sludge.
Example 3
(1) Smelting furnace slag (the smelting furnace slag of certain domestic nickel smelting plant, the main component is SiO2、MgO、CaO、FeO、Al2O3) Fly ash (the main component is SiO)2、Al2O3、Fe2O3CaO, MgO) and dry electroplating sludge (the main component of a certain domestic electroplating sewage treatment plant is SiO2The method comprises the steps of adding compounds containing heavy metal elements such as Cr, Fe, Ni, Cu, Zn and the like and soluble salts thereof into a tempering furnace, wherein the total chromium content of a leaching solution is measured to be 1769.8mg/L, GB/T15555.4-1995) and biomass solid waste coconut shells, wherein the mass ratio of adding smelting slag, fly ash, dried electroplating sludge and biomass solid waste is 1:1:0.3:1.6, and then heating to 950-1000 ℃ under a vacuum condition for smelting and high-temperature pyrolysis treatment.
(2) Centrifuging the melt obtained in the step (1) into fibers by a direct-connection four-roller centrifuge, and spraying a urea-formaldehyde resin adhesive, a polysiloxane emulsion water repellent and an epoxy silane coupling agent in the centrifuging process; wherein the addition amounts of the urea-formaldehyde resin adhesive, the polysiloxane emulsion water repellent and the epoxy silane coupling agent are respectively 20 percent, 2 percent and 0.5 percent of the mass of the melt fiber.
(3) And (3) collecting the fiber material obtained in the step (2) by a cotton collecting machine, extruding, folding and superposing by using a folding machine to form a three-dimensional rock wool layer, pressing the obtained rock wool layer, then sending the rock wool layer into a curing furnace for curing, and slitting to obtain the rock wool board.
The rock wool boards obtained in this example were sampled and crushed and the total chromium content was determined to be 0.67mg/L according to GB/T15555.4-1995. The method realizes the harmless treatment of the heavy metal pollution of the electroplating sludge.
Comparative example 1
Compared with the embodiment 1, the preparation method of the comparative example has the following specific preparation steps without adding biomass solid waste:
(1) smelting furnace slag (the smelting furnace slag of certain domestic nickel smelting plant, the main component is SiO2、MgO、CaO、FeO、Al2O3) Fly ash (the main component is SiO)2、Al2O3、Fe2O3CaO, MgO) and dry electroplating sludge (the main component of a certain domestic electroplating sewage treatment plant is SiO2The method comprises the steps of adding compounds containing heavy metal elements such as Cr, Fe, Ni, Cu, Zn and the like and soluble salts thereof into a quenching and tempering furnace, wherein the total chromium content of a leaching solution is 1769.8mg/L, GB/T15555.4-1995), adding smelting slag, fly ash and dry electroplating sludge in a mass ratio of 1:0.8:0.4, and then heating to 1050-1100 ℃ under a vacuum condition for smelting and high-temperature pyrolysis treatment.
(2) Centrifuging the melt obtained in the step (1) into fibers by a direct-coupled four-roller centrifuge, and spraying a phenolic resin adhesive, a polysiloxane emulsion water repellent and an aminosilane coupling agent in the centrifuging process; wherein the addition amounts of the phenolic resin adhesive, the polysiloxane emulsion water repellent and the aminosilane coupling agent are respectively 16 percent, 1 percent and 0.2 percent of the mass of the melt fiber.
(3) And (3) collecting the fiber material obtained in the step (2) by a cotton collecting machine, extruding, folding and superposing by using a folding machine to form a three-dimensional rock wool layer, pressing the obtained rock wool layer, then sending the rock wool layer into a curing furnace for curing, and slitting to obtain the rock wool board.
The rock wool boards obtained in this example were sampled and crushed and the total chromium content was determined to be 437.7mg/L by GB/T15555.4-1995. As can be seen by comparison with example 1, the rock wool board product obtained does not meet the standard for safe use without adding biomass solid waste.
Comparative example 2
Compared with the embodiment 1, the preparation method of the comparative example has the following specific steps without adding dry electroplating sludge and biomass solid waste:
(1) smelting furnace slag (the smelting furnace slag of certain domestic nickel smelting plant, the main component is SiO2、MgO、CaO、FeO、Al2O3) And fly ash (SiO as the main component)2、Al2O3、Fe2O3CaO and MgO) is added into a tempering furnace, wherein the mass ratio of the smelting furnace slag to the fly ash is 1:0.8, and then the temperature is raised to 1050-1100 ℃ under the vacuum condition for smelting and high-temperature pyrolysis treatment.
(2) Centrifuging the melt obtained in the step (1) into fibers by a direct-coupled four-roller centrifuge, and spraying a phenolic resin adhesive, a polysiloxane emulsion water repellent and an aminosilane coupling agent in the centrifuging process; wherein the addition amounts of the phenolic resin adhesive, the polysiloxane emulsion water repellent and the aminosilane coupling agent are respectively 16 percent, 1 percent and 0.2 percent of the mass of the melt fiber.
(3) And (3) collecting the fiber material obtained in the step (2) by a cotton collecting machine, extruding, folding and superposing by using a folding machine to form a three-dimensional rock wool layer, pressing the obtained rock wool layer, then sending the rock wool layer into a curing furnace for curing, and slitting to obtain the rock wool board.
The rock wool boards obtained in the above examples 1 to 3 and comparative examples 1 to 2 were subjected to performance tests, the test items include tensile strength (TR15) and compressive strength (thickness 50mm, 10% deformation), the test standard is GB/T25975-2018, and the test results are shown in table 1 below.
TABLE 1
| Tensile strength/kPa | Compressive strength/kPa | |
| Example 1 | 16.8 | 69.4 |
| Example 2 | 18.1 | 72.3 |
| Example 3 | 15.0 | 66.7 |
| Comparative example 1 | 13.9 | 65.2 |
| Comparative example 2 | 10.7 | 58.4 |
The results in table 1 show that the rock wool board obtained by smelting and pyrolyzing the biomass solid waste, the smelting furnace slag, the fly ash and the electroplating sludge under vacuum conditions has remarkably improved mechanical strength, and the reason is that the biomass solid waste generates biochar with a reducing effect after pyrolysis, so that the melt structure and the fiber forming property of the melt can be effectively improved. The method simultaneously realizes the recycling of the nickel smelting furnace slag, the fly ash, the electroplating sludge and the biomass solid waste, reduces the environmental pollution and generates good economic benefit and environmental protection benefit.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A method for producing rock wool boards by comprehensively utilizing solid wastes is characterized by comprising the following steps:
(1) adding smelting furnace slag, fly ash, dry electroplating sludge and biomass solid waste into a tempering furnace, heating to 900-1200 ℃ under a vacuum condition, and carrying out smelting and high-temperature pyrolysis treatment;
(2) centrifuging the melt obtained in the step (1) into fibers, and spraying a resin adhesive, a water repellent and a coupling agent in the centrifuging process;
(3) and (3) collecting the fiber material obtained in the step (2), pressing, curing and slitting to obtain the rock wool board.
2. The method for producing rock wool boards by comprehensively utilizing solid wastes according to claim 1, wherein the smelting slag in the step (1) is characterized in that the main component of the smelting slag comprises SiO2、MgO、CaO、FeO、Al2O3The nickel smelting slag.
3. The method for producing rock wool boards by comprehensively utilizing solid wastes according to claim 1, wherein the biomass solid wastes in the step (1) refer to at least one of farmland straws, wood chips and fruit shells.
4. The method for producing rock wool boards by comprehensively utilizing solid wastes as claimed in claim 1, wherein the mass ratio of the smelting furnace slag, the fly ash, the dried electroplating sludge and the biomass solid wastes in the step (1) is 1 (0.5-1): (0.3-0.5): 0.8-1.6).
5. The method for producing rock wool boards by comprehensively utilizing solid wastes according to claim 1, wherein the centrifugation in the step (2) is performed by a direct-connection four-roll centrifuge.
6. The method for producing rock wool boards by comprehensively utilizing solid wastes according to claim 1, wherein the resin binder in the step (2) is a phenol resin binder or a urea resin binder.
7. The method for producing rock wool boards by comprehensively utilizing solid wastes as claimed in claim 1, wherein in the step (2), the water repellent is a polysiloxane emulsion water repellent; the coupling agent is an amino silane coupling agent or an epoxy silane coupling agent.
8. The method for producing rock wool boards by comprehensively utilizing solid wastes according to claim 1, wherein the adding amount of the resin binder in the step (2) is 5-20% of the mass of the melt fibers; the adding amount of the water repellent is 0.5-2% of the mass of the melt fiber; the addition amount of the coupling agent is 0.1-0.5% of the mass of the melt fiber.
9. The method for producing rock wool boards by comprehensively utilizing solid wastes as claimed in claim 1, wherein the step (3) of collecting the rock wool is to collect the rock wool by a cotton collecting machine and then to extrude, fold and stack the rock wool into a three-dimensional rock wool layer by a folding machine.
10. A rock wool panel prepared by the method of any one of claims 1 to 9.
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