CN117732788A - Recovery method for demolishing natural granite material - Google Patents
Recovery method for demolishing natural granite material Download PDFInfo
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- CN117732788A CN117732788A CN202311801078.9A CN202311801078A CN117732788A CN 117732788 A CN117732788 A CN 117732788A CN 202311801078 A CN202311801078 A CN 202311801078A CN 117732788 A CN117732788 A CN 117732788A
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- 239000000463 material Substances 0.000 title claims abstract description 184
- 239000010438 granite Substances 0.000 title claims abstract description 171
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000011084 recovery Methods 0.000 title claims abstract description 17
- 239000000243 solution Substances 0.000 claims abstract description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000004140 cleaning Methods 0.000 claims abstract description 73
- 238000002791 soaking Methods 0.000 claims abstract description 72
- 238000011010 flushing procedure Methods 0.000 claims abstract description 20
- 238000005406 washing Methods 0.000 claims abstract description 15
- 239000003929 acidic solution Substances 0.000 claims abstract description 14
- 230000001680 brushing effect Effects 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims description 73
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 66
- 239000002253 acid Substances 0.000 claims description 33
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 24
- 239000001509 sodium citrate Substances 0.000 claims description 17
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 17
- 239000000853 adhesive Substances 0.000 claims description 16
- 230000001070 adhesive effect Effects 0.000 claims description 16
- RZXLPPRPEOUENN-UHFFFAOYSA-N Chlorfenson Chemical compound C1=CC(Cl)=CC=C1OS(=O)(=O)C1=CC=C(Cl)C=C1 RZXLPPRPEOUENN-UHFFFAOYSA-N 0.000 claims description 15
- 239000004115 Sodium Silicate Substances 0.000 claims description 15
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 15
- 150000002191 fatty alcohols Chemical class 0.000 claims description 15
- 239000002440 industrial waste Substances 0.000 claims description 15
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 15
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 15
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 13
- 239000011083 cement mortar Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- -1 alkylbenzene sulfonate Chemical class 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 abstract description 116
- 238000005516 engineering process Methods 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 24
- 239000002699 waste material Substances 0.000 description 22
- 230000000694 effects Effects 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 16
- 239000000428 dust Substances 0.000 description 15
- 230000036571 hydration Effects 0.000 description 10
- 238000006703 hydration reaction Methods 0.000 description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 10
- 239000000378 calcium silicate Substances 0.000 description 8
- 229910052918 calcium silicate Inorganic materials 0.000 description 8
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 8
- 239000004570 mortar (masonry) Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 5
- 239000000920 calcium hydroxide Substances 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 5
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 235000013980 iron oxide Nutrition 0.000 description 5
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000007127 saponification reaction Methods 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 238000009736 wetting Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000536 complexating effect Effects 0.000 description 3
- 238000010668 complexation reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005201 scrubbing Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 238000010306 acid treatment Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 150000004996 alkyl benzenes Chemical class 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000008233 hard water Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000009418 renovation Methods 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 229910052655 plagioclase feldspar Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
Abstract
The invention discloses a recovery method for removing natural granite materials, which comprises the following steps: (1) Soaking the removed natural granite materials in an acidic solution; (2) Washing the surface of the soaked removed natural granite by adopting high-pressure water; (3) Placing the washed removed natural granite materials into a cleaning solution for soaking; (4) Brushing the surface of the soaked removed natural granite by adopting a stone cleaning brush, and flushing the surface of the removed natural granite by adopting high-pressure water to obtain the removed natural granite with clean surface. The recovery method for removing the natural granite material does not need to polish and polish the surface of the stone material, thereby keeping the original dimension of the stone material to the maximum extent, combining the stone material surface cleaning technology to clean the surface of the stone material, realizing perfect retreading of the natural granite material, and solving the technical problem that the natural granite material is difficult to recycle.
Description
Technical Field
The invention relates to the technical field of solid waste resource utilization, in particular to a recovery method for removing natural granite materials.
Background
In the city updating process, a large amount of natural stone materials and natural stone wall and floor tiles for square pavement such as square stones, road surface stones and curb stones are removed, and a large amount of removed natural stone building rubbish is generated. The removed natural stone is mainly natural granite stone, the main mineral components of the natural stone are quartz, potassium feldspar and acid plagioclase, and the chemical components are mainly SiO 2 The rock belongs to invasive rock in acidic magma rock, and has the characteristics of high compressive strength, high surface hardness, low water absorption, good chemical stability, acid and alkali resistance, wear resistance, strong weather resistance and the like, and good service performance and appearance integrity are always kept when the rock is removed. In the paving or wet-pasting construction process of the natural granite material, the bottom surface of the natural granite material is often coated with cement-based adhesive and bonded with leveling mortar, and is often subjected to joint filling treatment by adopting cement-based joint filling agent, and more hardened cement-based materials are adhered to the bottom surface and four sides of the natural granite material when the natural granite material is dismantled; meanwhile, the upper surface of the stone is usually accumulated with more dirt such as dust, greasy dirt, rust and the like in the use process, so that the decorative effect of the stone is seriously affected; therefore, the removed natural granite materials are difficult to recycle, and are usually treated in an open-air stacking or landfill mode, so that resource waste and environmental pollution are caused. The natural granite materials which are removed in small quantity are crushed and screened to prepare the recycled aggregate, but the energy consumption and equipment loss in the crushing process are large because the natural granite materials have high hardness and strength, and the added value of the recycling utilization is lower.
Disclosure of Invention
The invention provides a recovery method for removing natural granite materials, which aims to solve the technical problem that the natural granite materials are difficult to recycle.
According to one aspect of the present invention, there is provided a recycling method for demolishing natural granite material, comprising the steps of:
(1) Soaking the removed natural granite materials in an acid solution, wherein the removed natural granite materials are completely immersed in the acid solution in the soaking process, the pH value of the acid solution is not more than 3, and the soaking time is not less than 3 days;
(2) Washing the surface of the soaked removed natural granite by adopting high-pressure water, wherein the pressure of the high-pressure water is not lower than 25MPa;
(3) Soaking the washed removed natural granite materials in a cleaning solution, wherein the removed natural granite materials are completely immersed in the cleaning solution in the soaking process, and the soaking time is 5-10 minutes; the cleaning solution is prepared from water and one or more of linear alkylbenzene sulfonate, sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether sulfonate, sodium bicarbonate, sodium silicate and sodium citrate;
(4) Brushing the surface of the soaked removed natural granite material by adopting a cleaning brush, and then flushing the surface of the removed natural granite material by adopting high-pressure water to obtain the removed natural granite material with clean surface.
Further, the removing the natural granite material comprises one or more of removing natural granite square stone, natural granite pavement stone, natural granite curb stone and natural granite material wall and floor tile.
Further, the adherends for removing the bottom surface of the natural granite material comprise cement-based adhesives and cement mortar, and the adherends on the side surfaces comprise cement-based joint filling agents.
Further, the acidic solution comprises one or more of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid or industrial waste acid.
Further, the industrial waste acid is industrial waste sulfuric acid.
Further, the pH value of the acidic solution is 1-3.
Further, the soaking time is 3-28 days.
Further, the cleaning liquid comprises the following raw material components in parts by mass: 5 parts of linear alkylbenzene sulfonate, 10 parts of sodium dodecyl sulfate, 5 parts of fatty alcohol polyoxyethylene ether sulfonate, 2 parts of sodium bicarbonate, 3 parts of sodium silicate, 5 parts of sodium citrate and 70 parts of water.
The invention has the following beneficial effects:
according to the method for recovering the removed natural granite materials, the natural granite materials are soaked and removed by adopting the acid solution, and the calcium hydroxide which is a cement hydration product is neutralized by utilizing acid, so that the alkalinity of cement-based materials is reduced, cement hydration products such as hydrated calcium silicate, hydrated calcium aluminate and the like are gradually dissolved, the strength of the cement-based materials adhered to the surface of the stone materials and the bonding strength of the cement-based materials and the stone materials are finally reduced, the stone materials can be easily removed under the flushing of high-pressure water, and the stone materials are not required to be polished, so that the recovery process is simplified, the recovery cost is reduced, and the original size of the stone materials is also maintained to the greatest extent; at the same time, the acid solution can also make the main component Fe of rust 2 O 3 And a small amount of FeO and other iron oxides are converted into soluble ferric salt, so that the stone surface rust yellow spot removing agent has the effect of removing the stone surface rust yellow spot. The cleaning solution can reduce the surface tension of dirt such as dust, greasy dirt and water, weaken or offset the adhesive force of the dirt on the stone surface, saponify and emulsify the greasy dirt, thoroughly drop the dirt such as dust, greasy dirt and the like from the stone surface under the effects of scrubbing by a stone cleaning brush and high-pressure water flushing, finally obtain the clean-surface removed natural granite material, and realize perfect renovation of the removed natural granite material. The renovated natural granite material can be directly reused in engineering, thereby realizing the high added value recycling of the removed natural granite material. When the natural granite material is soaked and removed by using the industrial waste sulfuric acid, not only acid-base neutralization reaction and dissolution of cement hydration products such as hydrated calcium silicate are generated, but also calcium sulfate is generated and crystallization pressure is generated, so that the cement-based material swells and cracks, and the industrial waste sulfuric acid is freeThe harm treatment further reduces the strength of the cement-based material adhered to the stone surface and the bonding strength of the cement-based material and the stone, and reduces the resource cost of waste acid treatment and removal of the natural granite.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail below.
Detailed Description
In order to make the objects, technical solutions and advantageous technical effects of the present invention clearer, the present invention will be further described in detail with reference to examples. It should be understood that the examples described in this specification are for the purpose of illustrating the invention only and are not intended to limit the invention.
For simplicity, only a few numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form a range not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and any upper limit may be combined with any other upper limit to form a range not explicitly recited. Furthermore, each point or individual value between the endpoints of the range is included within the range, although not explicitly recited. Thus, each point or individual value may be combined as a lower or upper limit on itself with any other point or individual value or with other lower or upper limit to form a range that is not explicitly recited.
In the description herein, unless otherwise indicated, "above" and "below" are intended to include the present number, "one or more" means two or more, and "one or more" means two or more.
The embodiment of the invention provides a recovery method for removing natural granite materials, which comprises the following steps:
(1) Soaking the removed natural granite materials in an acid solution, wherein the removed natural granite materials are completely immersed in the acid solution in the soaking process, the pH value of the acid solution is not more than 3, and the soaking time is not less than 3 days;
(2) Washing the surface of the soaked removed natural granite by adopting high-pressure water, wherein the pressure of the high-pressure water is not lower than 25MPa;
(3) Soaking the washed removed natural granite materials in a cleaning solution, wherein the removed natural granite materials are completely immersed in the cleaning solution in the soaking process, and the soaking time is 5-10 minutes; the cleaning solution is prepared from water and one or more of linear alkylbenzene sulfonate, sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether sulfonate, sodium bicarbonate, sodium silicate and sodium citrate;
(4) Brushing the surface of the soaked removed natural granite material by adopting a cleaning brush, and then flushing the surface of the removed natural granite material by adopting high-pressure water to obtain the removed natural granite material with clean surface.
The strength of cement-based materials such as adhesive, mortar, caulking agent and the like adhered to the surface of the stone and the bonding strength of the cement-based materials with the stone can be reduced by adopting acid solution to soak and remove the natural granite materials, when the strength of the cement-based materials is reduced to a certain degree, the cement-based materials can be easily washed down by adopting high-pressure water, so that the purpose of removing the cement-based materials such as adhesive, mortar, caulking agent and the like adhered to the surface of the stone is achieved; at the same time can also lead the main component Fe of the rust 2 O 3 And a small amount of FeO and other iron oxides are acidified and converted into soluble ferric salt, so that the stone surface rust yellow spot removing agent has the effect of removing the stone surface rust yellow spot. During the service period, the upper surface of the natural granite material generally stores more dirt such as dust, greasy dirt, rust yellow spot and the like, the natural granite material is soaked and removed by adopting a cleaning solution, the dirt is dissolved, loosened and shed by the synergistic effect by utilizing the properties of the components such as surfactant, alkali, complexing agent and the like in the cleaning solution, such as interfacial tension reduction, wetting, loosening, dispersing, emulsifying, saponification, complexing and the like, and the dirt such as dust, greasy dirt and the like is thoroughly removed from the surface of the stone material under the brushing and high-pressure water flushing effects of the stone cleaning brush, so that the clean-surface removed natural granite material is obtained.
In some embodiments, the demolishing the natural granite material includes one or more of demolishing natural granite square stone, natural granite road stone, natural granite curb stone, and natural granite wall and floor tile.
In some embodiments, the adherends for removing the bottom surface of the natural granite material include cement-based adhesives and cement mortars, and the side adherends include cement-based caulks.
In some embodiments, the acidic solution comprises one or more of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, or spent industrial acid.
In some embodiments, the industrial waste acid is industrial waste sulfuric acid.
A large amount of waste sulfuric acid is generated in industrial production, if the waste sulfuric acid is directly discharged, resources are wasted, the environment is seriously polluted, and therefore, the waste sulfuric acid must be subjected to harmless treatment before being discharged, and the economic burden of enterprises is increased. The technical proposal of the application can adopt waste sulfuric acid solution to soak and remove the natural granite materials, and waste sulfuric acid and cement hydration products Ca (OH) 2 The acid-base neutralization reaction is carried out, so that cement hydration products such as calcium silicate hydrate, calcium aluminate hydrate and the like are gradually dissolved, and meanwhile, the generated calcium sulfate generates crystallization pressure, so that the cement-based material can generate expansion cracking, and the strength of the cement-based material adhered to the stone surface and the bonding strength of the cement-based material with the stone are reduced. The chemical reaction not only realizes harmless treatment of the waste sulfuric acid, but also reduces the strength of the cement-based material on the stone surface, so that the cement-based material can be easily removed under high-pressure water flushing, and the waste sulfuric acid treatment and the natural granite resource dismantling cost are reduced.
In some embodiments, the acidic solution has a pH of 1 to 3.
And soaking in the same acidic solution for the same time, wherein the bonding strength of the cement mortar is gradually increased along with the increase of the pH value of the acidic solution. When the pH value of the acid solution is between 1 and 3, the acid-base neutralization reaction can be carried out quickly, so that the alkalinity of the cement-based material is reduced, thereby causing quick dissolution of cement hydration products such as hydrated calcium silicate, hydrated calcium aluminate and the like, the strength of the cement-based material adhered to the surface of the removed natural granite material is reduced quickly, and finally the cement-based material can be easily removed under the flushing of high-pressure water.
In some embodiments, the soaking time is 3 to 28 days.
When the soaking time is 3-28 days, the strength of the cement-based material adhered to the surface of the removed natural granite material is obviously reduced, and the high-pressure water is enough to wash down all the cement-based material adhered to the surface of the stone material. When the soaking time is too short, the acid-base neutralization reaction degree is low, and the cement hydration product Ca (OH) 2 The consumption is less, the cement-based material still keeps higher alkalinity, cement hydration products such as calcium silicate hydrate, calcium aluminate hydrate and the like are slowly dissolved, the cement-based material adhered on the surface of the natural granite material is removed, the strength is still kept higher, and the high-pressure water is insufficient for completely removing the cement-based material in a shorter time. When the soaking time is too long, the period of removing the natural granite materials is prolonged, the cost of recycling the natural granite materials is increased, and the natural granite materials can be corroded and damaged.
In some embodiments, the cleaning solution is formulated from one or more of linear sodium alkylbenzene sulfonate, sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether sulfonate, sodium bicarbonate, sodium silicate, sodium citrate, and water. Further, the cleaning liquid comprises the following raw material components in parts by mass: 5 parts of linear alkylbenzene sulfonate, 10 parts of sodium dodecyl sulfate, 5 parts of fatty alcohol polyoxyethylene ether sulfonate, 2 parts of sodium bicarbonate, 3 parts of sodium silicate, 5 parts of sodium citrate and 70 parts of water.
During the service period of the natural granite material, the upper surface of the natural granite material usually stores more dirt such as dust, greasy dirt, rust yellow spot and the like, and the decorative effect of the natural granite material is seriously affected. The natural granite material is soaked and removed by adopting acid solution, so that not only can the cement-based material adhered to the surface of the stone material be eroded, but also the main component Fe of the rust can be made 2 O 3 And a small amount of FeO and other iron oxides are converted into soluble ferric salt, so that the purposes of removing cement-based materials and rust spots on the stone surface are achieved. The natural granite material is soaked and removed by adopting a cleaning solution, wherein the linear alkylbenzene sulfonate, the dodecyl sodium sulfate and the fatty alcohol polyoxyethylene ether sulfonate can obviously reduce the interfacial tension between dirt and water, continuously moisten, loosen and disperse dirt particles, emulsify greasy dirt and reduce the attachment of the greasy dirt to the stone materialForce application; sodium bicarbonate and sodium silicate can improve the alkalinity of the cleaning solution, saponify or emulsify greasy dirt, have good degreasing effect, neutralize the acidic solution in stone pores, and reduce the corrosion of the residual acidic solution to stone; sodium citrate has good complexing effect on various scale forming metal ions, and can generate soluble complex for cleaning; the components are soluble in water, have good hard water resistance and living degradability, dissolve, loosen and fall off dirt such as dust, greasy dirt, rust yellow spot and the like through the synergistic effects of acidification, interface tension reduction, wetting, loosening, dispersion, emulsification, saponification, complexation and the like, and are cleaned under the conditions of scrubbing of a stone cleaning brush and high-pressure water flushing, so that the natural granite material with clean surface and removed is obtained.
Examples
The following examples more particularly describe the disclosure of the present application, which are intended as illustrative only, since numerous modifications and variations within the scope of the disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the examples below are by weight, and all reagents used in the examples are commercially available or were obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.
In the following examples and comparative examples, the removed natural granite materials are the natural granite square stones removed in a certain city renovation project, more cement-based adhesives and cement mortar are adhered to the bottom surface, and more cement-based caulking agent is adhered to the side surface; the upper surface stores more dirt such as dust, greasy dirt, rust yellow spot and the like. The industrial waste acid is waste sulfuric acid generated by a dye factory.
Example 1
The embodiment provides a recovery method for removing natural granite materials, which comprises the following steps: (1) Soaking the removed natural granite materials in hydrochloric acid solution with pH values of 1, 2 and 3 for 3 days, 7 days, 14 days and 28 days respectively; during the soaking period, the stone is ensured to be completely immersed in the hydrochloric acid solution, and the pH value of the hydrochloric acid solution is kept basically unchanged; (2) Washing the surface of the soaked removed natural granite by adopting high-pressure water, and removing cement-based materials adhered to the surface of the stone, wherein the pressure of the high-pressure water is 25MPa; (3) Soaking the washed removed natural granite material in a cleaning solution, wherein the cleaning solution comprises 5 parts of straight-chain sodium alkylbenzenesulfonate, 10 parts of sodium dodecyl sulfate, 5 parts of fatty alcohol polyoxyethylene ether sulfonate, 2 parts of sodium bicarbonate, 3 parts of sodium silicate, 5 parts of sodium citrate and 70 parts of water; during the soaking period, ensuring that the stone is completely immersed in the cleaning solution, wherein the soaking time is 8 minutes; (4) The method comprises the steps of firstly brushing the surface of the soaked removed natural granite by adopting a stone cleaning brush, and then flushing the surface of the stone by adopting high-pressure water to obtain the removed natural granite with clean surface.
Example 2
The embodiment provides a recovery method for removing natural granite materials, which comprises the following steps: (1) Soaking the removed natural granite materials in a waste sulfuric acid solution with the pH value of 1 for 3 days, 7 days, 14 days and 28 days; during the soaking period, the stone is ensured to be completely immersed in the waste sulfuric acid solution, and the pH value of the waste sulfuric acid solution is kept basically unchanged; (2) Washing the surface of the soaked removed natural granite by adopting high-pressure water, and removing cement-based materials adhered to the surface of the stone, wherein the pressure of the high-pressure water is 25MPa; (3) Placing the washed removed natural granite materials into a cleaning solution for soaking; during the soaking period, ensuring that the stone is completely immersed in the cleaning solution, wherein the formula of the cleaning solution and the soaking time are the same as those of the embodiment 1; (4) The method comprises the steps of firstly brushing the surface of the soaked removed natural granite by adopting a stone cleaning brush, and then flushing the surface of the stone by adopting high-pressure water to obtain the removed natural granite with clean surface.
Comparative example 1
This comparative example provides a recovery method for demolishing natural granite, comprising the steps of: (1) Soaking the removed natural granite materials in hydrochloric acid solution with the pH value of 1 for 3 hours, 6 hours, 1 day and 2 days respectively; during the soaking period, the stone is ensured to be completely immersed in the hydrochloric acid solution, and the pH value of the hydrochloric acid solution is kept basically unchanged; (2) Washing the surface of the soaked removed natural granite by adopting high-pressure water, and removing cement-based materials adhered to the surface of the stone, wherein the pressure of the high-pressure water is 25MPa; (3) Placing the washed removed natural granite materials into a cleaning solution for soaking; during the soaking period, ensuring that the stone is completely immersed in the cleaning solution, wherein the formula of the cleaning solution and the soaking time are the same as those of the embodiment 1; (4) The method comprises the steps of firstly brushing the surface of the soaked removed natural granite by adopting a stone cleaning brush, and then flushing the surface of the stone by adopting high-pressure water to obtain the removed natural granite with clean surface.
Comparative example 2
This comparative example provides a recovery method for demolishing natural granite, comprising the steps of: (1) Soaking the removed natural granite materials in an industrial waste sulfuric acid solution, wherein the pH value of the waste sulfuric acid solution is 1, and the soaking time is 3 days, 7 days, 14 days and 28 days; during the soaking period, the stone is ensured to be completely immersed in the waste sulfuric acid solution, and the pH value of the waste sulfuric acid solution is kept basically unchanged; (2) Washing the surface of the soaked removed natural granite by adopting high-pressure water, and removing cement-based materials adhered to the surface of the stone, wherein the pressure of the high-pressure water is 15MPa; (3) Placing the washed removed natural granite materials into a cleaning solution for soaking; during the soaking period, ensuring that the stone is completely immersed in the cleaning solution, wherein the formula of the cleaning solution and the soaking time are the same as those of the embodiment 1; (4) The method comprises the steps of firstly brushing the surface of the soaked removed natural granite by adopting a stone cleaning brush, and then flushing the surface of the stone by adopting high-pressure water to obtain the removed natural granite with clean surface.
Comparative example 3
The embodiment provides a recovery method for removing natural granite materials, which comprises the following steps: (1) Soaking the removed natural granite materials in a waste sulfuric acid solution with the pH value of 1 for 3 days, 7 days, 14 days and 28 days; during the soaking period, the stone is ensured to be completely immersed in the waste sulfuric acid solution, and the pH value of the waste sulfuric acid solution is kept basically unchanged; (2) Washing the surface of the soaked removed natural granite by adopting high-pressure water, and removing cement-based materials adhered to the surface of the stone, wherein the pressure of the high-pressure water is 25MPa; (3) Soaking the washed removed natural granite material in a cleaning solution, wherein the cleaning solution comprises 5 parts of straight-chain sodium alkylbenzenesulfonate, 10 parts of sodium dodecyl sulfate, 5 parts of fatty alcohol polyoxyethylene ether sulfonate, 5 parts of sodium citrate and 75 parts of water; ensuring that the stone is completely immersed in the cleaning solution during the soaking period, wherein the soaking time is 8 minutes; (4) The method comprises the steps of firstly brushing the surface of the soaked removed natural granite by adopting a stone cleaning brush, and then flushing the surface of the stone by adopting high-pressure water to obtain the removed natural granite with clean surface.
Comparative example 4
The embodiment provides a recovery method for removing natural granite materials, which comprises the following steps: (1) Soaking the removed natural granite materials in a waste sulfuric acid solution with the pH value of 1 for 3 days, 7 days, 14 days and 28 days; during the soaking period, the stone is ensured to be completely immersed in the waste sulfuric acid solution, and the pH value of the waste sulfuric acid solution is kept basically unchanged; (2) Washing the surface of the soaked removed natural granite by adopting high-pressure water, and removing cement-based materials adhered to the surface of the stone, wherein the pressure of the high-pressure water is 25MPa; (3) Soaking the washed removed natural granite materials in a cleaning solution, wherein the cleaning solution comprises 2 parts of sodium bicarbonate, 3 parts of sodium silicate, 5 parts of sodium citrate and 90 parts of water; ensuring that the stone is completely immersed in the cleaning solution during the soaking period, wherein the soaking time is 8 minutes; (4) The method comprises the steps of firstly brushing the surface of the soaked removed natural granite by adopting a stone cleaning brush, and then flushing the surface of the stone by adopting high-pressure water to obtain the removed natural granite with clean surface.
Comparative example 5
The embodiment provides a recovery method for removing natural granite materials, which comprises the following steps: (1) Flushing the surface of the removed natural granite by adopting high-pressure water, wherein the pressure of the high-pressure water is 25MPa; (2) Soaking the washed removed natural granite material in a cleaning solution, wherein the cleaning solution comprises 5 parts of straight-chain sodium alkylbenzenesulfonate, 10 parts of sodium dodecyl sulfate, 5 parts of fatty alcohol polyoxyethylene ether sulfonate, 2 parts of sodium bicarbonate, 3 parts of sodium silicate, 5 parts of sodium citrate and 70 parts of water; ensuring that the stone is completely immersed in the cleaning solution during the soaking period, wherein the soaking time is 8 minutes; (4) The method comprises the steps of firstly brushing the surface of the soaked removed natural granite by adopting a stone cleaning brush, and then flushing the surface of the stone by adopting high-pressure water to obtain the removed natural granite with clean surface.
Before the above examples 1 to 2 and comparative examples 1 to 4 were carried out, the natural granite materials were bonded with cement mortar to prepare bonding samples and were standard-cured for 28 days, and then immersed in the same acid solution for the same time as the removal of the natural granite materials, and then the bonding strength was measured to evaluate the degree of corrosion of the cement-based materials at different pH values and immersion times.
The adhesive strength of the adhesive samples in examples 1 to 2 and comparative examples 1 to 4 was measured according to the "basic test method for building mortar Standard" (JGJ/T70-2009); the cleaning effect of removing cement-based materials such as adhesives, mortars, caulking agents and the like adhered to the surface of the natural granite materials in examples 1 to 2 and comparative examples 1 to 5 under high-pressure water washing was observed and recorded, and the surface cleaning effect of removing the natural granite materials was observed and recorded, and the results are shown in table 1.
TABLE 1 Cement mortar bond Strength and Cement-based bond Material removal, stone surface cleaning Effect
As is clear from the test results of examples 1 to 2, the adhesive strength of the cement mortar gradually decreases with the extension of the soaking time under the same pH condition by soaking in the same acid solution; soaking in the same acid solution for the same time, wherein the bonding strength of the cement mortar is gradually increased along with the increase of the pH value; respectively soaking in hydrochloric acid and industrial waste sulfuric acid solution, and soaking cement mortar soaked by industrial waste sulfuric acid with the same pH value and soaking time, wherein the cement mortar is prepared fromIn sulfuric acid and Ca (OH) 2 Chemical reaction takes place to produce CaSO 4 The expansion crystallization pressure is generated, and the bonding interface between the cement-based material and the stone is damaged, so that the bonding strength is smaller.
The cement is hydrated in water to produce hydrated calcium silicate gel, calcium hydroxide crystal, hydrated calcium sulfoaluminate (AFt and AFm) and other hydrated products, wherein the hydrated calcium silicate accounts for about 70%, the calcium hydroxide accounts for about 20% and the hydrated calcium sulfoaluminate accounts for about 7%. These hydration products are stable due to the alkaline environment provided by the calcium hydroxide. When the cement-based material is soaked in the acid solution, the calcium hydroxide and the acid are subjected to neutralization reaction, and the pH value in the cement stone is continuously reduced along with the continuous progress of the neutralization reaction, so that hydration products such as calcium silicate hydrate, calcium aluminate hydrate and the like are dissolved, and finally, the cement-based material is eroded, and the strength is continuously reduced. SO in industrial waste sulfuric acid solution 4 2- Will be combined with Ca 2+ The chemical reaction is carried out to generate calcium sulfate, and the expansion crystallization pressure is generated, so that the degradation of the cement stone is accelerated.
The removed natural granite square stone is soaked in an acid solution, cement-based materials such as adhesive, mortar, caulking agent and the like adhered to the surface of the natural granite square stone are continuously eroded, the strength of the natural granite square stone and the bonding strength with the stone are continuously reduced, and the natural granite square stone can be easily flushed under the action of high-pressure water after the strength of the natural granite square stone is reduced to a certain extent, so that the removal of the cement-based materials adhered to the surface of the stone is realized.
During the service period of the natural granite material, the upper surface of the natural granite material is usually accumulated with more dirt such as dust, greasy dirt, rust yellow spot and the like, and the natural granite material is soaked and removed by adopting acid solution, so that not only the cement-based material adhered to the surface of the stone material can be eroded, but also the main component Fe of the rust can be caused 2 O 3 And a small amount of FeO and other iron oxides are converted into soluble ferric salt, so that the effects of removing cement-based materials and rust spots on the stone surface are achieved; the linear alkylbenzene sulfonate, the dodecyl sodium sulfate and the fatty alcohol polyoxyethylene ether sulfonate are used as the surfactant, so that the interfacial tension of dirt and water can be obviously reduced, dirt particles are continuously wetted, loosened and dispersed, and greasy dirt is emulsified, so that the interfacial tension of the dirt is reducedAdhesion to stone; sodium bicarbonate and sodium silicate can improve the alkalinity of the cleaning solution, saponify or emulsify greasy dirt, have good degreasing effect, neutralize the acidic solution in stone pores, and reduce the corrosion of the residual acidic solution to stone; sodium citrate has good complexing effect on various scale forming metal ions, and can generate soluble complex for cleaning; the cleaning solution is soluble in water, has good hard water resistance and life degradability, and sequentially dissolves, loosens and falls off dirt such as dust, greasy dirt, rust yellow spot and the like through the synergistic effects of acidification, interface tension reduction, wetting, loosening, dispersion, emulsification, saponification, complexation and the like, and is cleaned under the conditions of scrubbing of a stone cleaning brush and high-pressure water flushing, so that the natural granite material with clean surface and removed is obtained.
As shown by the test result of comparative example 1, when the soaking time (3 h, 8h, 1 day, 2 days) in the hydrochloric acid solution is short, the bonding strength of the cement mortar bonded natural granite material test piece is reduced, but the reduction amplitude is not large, at this time, the natural granite square stone is removed by soaking in the hydrochloric acid solution by high-pressure water, the cement-based material bonding object remains on the stone surface, namely, when the soaking time is too short, the strength of the cement-based material bonding object adhered on the stone surface is reduced less, and the high-pressure water is insufficient for washing all the cement-based material bonding object.
As is evident from the test results of comparative example 2, when the pressure of the high-pressure water is 15MPa, more adhesive remains on the surface of the demolished natural granite square stone immersed under the same conditions, and the pressure of the high-pressure water is insufficient to flush all the adhesive of the cement-based material.
From the test results of comparative example 3, it is known that the cleaning solution comprising linear alkylbenzene sulfonate, sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether sulfonate and sodium citrate is used for immersing, washing with high-pressure water to remove natural granite materials, and then washing with a stone cleaning brush and washing with high-pressure water, thus being capable of well removing dirt such as dust, rust and the like, but having poor effect of removing greasy dirt.
As is clear from the test results of comparative example 4, the cleaning solution comprising sodium bicarbonate, sodium silicate and sodium citrate is used for immersing the removed natural granite materials which are immersed in the acidic solution and washed by high-pressure water, and then the removed natural granite materials are brushed by a stone cleaning brush and washed by high-pressure water, so that dirt such as greasy dirt, rust yellow spot and the like can be well removed, but the dust dirt removing effect is poor.
From the test results of comparative example 5, it is known that the cleaning solution comprising sodium chain alkylbenzenesulfonate, sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether sulfonate, sodium bicarbonate, sodium silicate and sodium citrate is used for immersing the removed natural granite material washed by high-pressure water, and then the cleaned natural granite material is washed by a stone cleaning brush and washed by high-pressure water, so that dirt such as dust, greasy dirt and the like can be removed well, but the cleaning effect on rust spots is poor.
The above-mentioned method can reduce the strength of cement-based material adhered to stone surface and its binding strength with stone material by adopting acid solution to soak and remove natural granite material, when the strength is reduced to a certain extent, it can be easily washed down by adopting high-pressure water so as to attain the effect of removing cement-based material of adhesive, mortar and caulking agent adhered to stone surface, but when the soaking time is too short or high-pressure water pressure is lower, because the strength of adhered cement-based material is higher, the high-pressure water is not enough to wash down all of it, so that more binding material remains on stone surface. During the service period of the natural granite material, the upper surface of the natural granite material usually stores more dirt such as dust, greasy dirt, rust yellow spot and the like, and the cleaning methods are different because the components, the forming principle and the like of different types of dirt are different. The invention firstly adopts acid solution to soak and remove the natural granite material, which not only can erode the cement-based material adhered on the stone surface, but also can lead the main component Fe of the rust to be 2 O 3 And a small amount of FeO and other iron oxides are converted into soluble ferric salt, so that the effects of removing cement-based materials and rust spots on the stone surface are achieved; the natural granite material is removed by soaking the natural granite material in a cleaning solution containing linear alkylbenzene sodium sulfonate, sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether sulfonate, sodium bicarbonate, sodium silicate and sodium citrate components and then acidifying and reducing interfacial tensionThe synergistic effects of force, wetting, loosening, dispersing, emulsifying, saponification, complexation and the like can dissolve, loosen and fall off dirt such as dust, greasy dirt, rust yellow spot and the like, and the dirt is removed by brushing and high-pressure water flushing of the stone cleaning brush, so that the natural granite material with clean surface can be obtained.
While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, the technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (8)
1. The recovery method for removing the natural granite material is characterized by comprising the following steps:
(1) Soaking the removed natural granite materials in an acid solution, wherein the removed natural granite materials are completely immersed in the acid solution in the soaking process, the pH value of the acid solution is not more than 3, and the soaking time is not less than 3 days;
(2) Washing the surface of the soaked removed natural granite by adopting high-pressure water, wherein the pressure of the high-pressure water is not lower than 25MPa;
(3) Soaking the washed removed natural granite materials in a cleaning solution, wherein the removed natural granite materials are completely immersed in the cleaning solution in the soaking process, and the soaking time is 5-10 minutes; the cleaning solution is prepared from water and one or more of linear alkylbenzene sulfonate, sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether sulfonate, sodium bicarbonate, sodium silicate and sodium citrate;
(4) Brushing the surface of the soaked removed natural granite material by adopting a cleaning brush, and then flushing the surface of the removed natural granite material by adopting high-pressure water to obtain the removed natural granite material with clean surface.
2. The method of claim 1, wherein the removing the natural granite material comprises removing one or more of natural granite square, natural granite pavement, natural granite curb, and natural granite material tile.
3. The method for recycling natural granite material according to claim 1, wherein the adhesion of the bottom surface of the natural granite material includes cement-based adhesive and cement mortar, and the adhesion of the side surface includes cement-based caulking agent.
4. The method for removing natural granite as set forth in claim 1, wherein the acidic solution includes one or more of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, and industrial waste acid.
5. The method for recovering removed natural granite materials as set forth in claim 4, wherein the industrial waste acid is industrial waste sulfuric acid.
6. The method for recovering removed natural granite as set forth in claim 1, wherein the pH of the acidic solution is 1-3.
7. The method for recovering removed natural granite as set forth in claim 1, wherein the soaking time is 3-28 days.
8. The method for recovering removed natural granite as set forth in claim 1, wherein the cleaning solution comprises the following raw materials in parts by mass: 5 parts of linear alkylbenzene sulfonate, 10 parts of sodium dodecyl sulfate, 5 parts of fatty alcohol polyoxyethylene ether sulfonate, 2 parts of sodium bicarbonate, 3 parts of sodium silicate, 5 parts of sodium citrate and 70 parts of water.
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