CN111573946B - Comprehensive utilization method of granite cutting waste liquid - Google Patents
Comprehensive utilization method of granite cutting waste liquid Download PDFInfo
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- CN111573946B CN111573946B CN202010449178.XA CN202010449178A CN111573946B CN 111573946 B CN111573946 B CN 111573946B CN 202010449178 A CN202010449178 A CN 202010449178A CN 111573946 B CN111573946 B CN 111573946B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- 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
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a method for comprehensively utilizing waste liquid generated in cutting of granite, which comprises the following steps: (1) adding a low surface energy substance into the granite cutting waste liquid; (2) for waste liquid such as gypsum, lime and the like, a precipitation process is adopted to separate large-particle waste residues with low unsaturated resin content; for the solution which is difficult to precipitate and has high content of unsaturated resin, the filler for the water-based architectural coating is modified by a wet method. The invention has the beneficial effects that: on the basis of analyzing the components of the granite cutting fluid, a sedimentation tank is adopted to separate large-particle calcium carbonate in the granite waste liquid, then an evaporation and membrane filtration combined mode is adopted to separate unsaturated resin and small-particle calcium carbonate, and no flocculating agent is added in the separation process, so that green separation is realized; and according to the characteristics of the separated waste slag, the method is applied in a differentiated manner, the application effect of the waste slag is improved, and the high-value utilization of the slag is realized.
Description
Technical Field
The invention relates to the technical field of utilization of granite cutting waste liquid, in particular to a comprehensive utilization method of the granite cutting waste liquid.
Background
The artificial granite waste residue contains about 75% of calcite, about 10% of dolomite and about 15% of unsaturated resin and impurity components, the particle distribution in the waste residue is uneven (shown in table 1), and the content of toxic and harmful substances in the waste residue is lower than the national building standard (shown in table 2). In recent years, a series of new technologies for resource utilization of stone wastes have been developed, but most of the technologies are directed to waste marble powder generated by processing natural stones. For example, zhengchang reports a method of treating wastes with wastes by flue gas desulfurization based on waste marble powder; preparing gypsum for building materials by reacting industrial waste acid with waste residue of agglomerated rock in the process of preparing the emergency hydramine and the Du Gaoxiang; liarmy et al reported a modification method of waste rock powder anionic fluorosurfactant based on dry grinding, and the product can be used as a filler for high polymer materials; zhang Jian et al reported a method for producing lime by using waste marble powder of nan' an. These researches provide new thought and method for resource utilization of heavy calcium waste residue of natural stone, but these processes are all based on powder obtained by drying waste residue liquid of artificial granite as raw material.
TABLE 1 particle size accumulation in artificial granite waste residue
TABLE 2 analysis of the content of toxic and harmful substances in the waste residue of artificial granite
In order to effectively realize the separation of small particles of waste residue and water, a flocculating agent Polyacrylamide (PAM) is added in the concentration process of waste stone slurry, so that the content of organic matters (unsaturated resin and PAM) in the waste residue is 4.66 percent. These polymeric residues pose great difficulties in recycling the waste residue of heavy calcium carbonate from the artificial granite. For example, the use of heavy calcium carbonate waste residues containing unsaturated polyester residues in fillers of high polymer materials such as plastics, rubbers and the like causes thermo-oxidative aging degradation of the high polymer materials; when the heavy calcium waste residue containing PAM is used in a flue gas wet desulphurization system, the solidification of limestone slurry and equipment blockage are easily caused; the use of heavy calcium waste residues containing high molecular residues for lime firing tends to cause explosive cracking and agglomeration of calcium carbonate during high temperature calcination, clogging the kiln. Therefore, aiming at the characteristics of difficult sedimentation of small particles, high unsaturated polyester content and the like in the artificial granite heavy calcium waste residue, the granite cutting fluid is provided for differential utilization.
Disclosure of Invention
The invention aims to provide a comprehensive utilization method of the waste granite cutting liquid, which solves the defects in the prior art, can eliminate the need of a flocculating agent in the utilization process of the waste granite cutting liquid, can realize green, low-cost and fine treatment of the waste granite residue, and is beneficial to promoting high-value utilization of the solid granite waste.
The invention provides a method for comprehensively utilizing waste liquid generated in cutting of granite, which comprises the following steps:
(1) adding a low surface energy substance into the granite cutting waste liquid;
(2) for waste liquid such as gypsum, lime and the like, a precipitation process is adopted to separate large-particle waste residues with low unsaturated resin content;
for the solution which is difficult to precipitate and has high content of unsaturated resin, the filler for the water-based architectural coating is modified by a wet method.
The method for comprehensively utilizing the waste cutting fluid of the granite, wherein the low-surface-energy substance in the step (1) is preferably an organic silicon surfactant.
The comprehensive utilization method of the granite cutting waste liquid is characterized in that the addition amount of the organic silicon surfactant is preferably 0.01-5% of the mass of the granite cutting waste liquid.
The comprehensive utilization method of the waste granite cutting liquid is characterized in that the precipitation process in the step (2) is preferably based on a horizontal flow type precipitation tank to separate the waste granite cutting liquid.
The method for comprehensively utilizing the waste liquid generated by cutting the granite comprises the steps of utilizing the generated amount and components of the waste residue liquid of the granite in the horizontal flow type sedimentation tank as objects, utilizing FLUENT software to simulate the generated amount and components of the waste residue liquid of the granite by adopting a PISO algorithm, obtaining data such as flow field traces, volume fractions of suspended matters, flow rates and the like of the waste residue liquid of the granite in the horizontal flow tank, simulating the distribution conditions of a concentration field and the flow field in the sedimentation tank, and designing the concentration field and the distribution conditions of the flow field on the basis of the data.
In the method for comprehensively utilizing the waste cutting fluid of the granite, the particle diameter of the large particle waste residue with low content of unsaturated resin in the step (2) is preferably more than 15 μm, and the particle diameter of the particle waste residue with low content of unsaturated resin and high content of unsaturated resin, which is difficult to precipitate, is preferably less than 15 μm.
The method for comprehensively utilizing the waste cutting fluid of the granite, wherein, preferably, the solution which is difficult to precipitate and has high content of unsaturated resin in the step (2) is prepared into small-particle waste slag slurry with solid content of 30-50% by an evaporation and combination membrane filtration mode, and then the surface of the waste slag particles is chemically modified.
In the method for comprehensively utilizing the waste cutting fluid of the granite, the surface chemistry of the waste slag particles is preferably modified by: adding a hydrolytic silane coupling agent in the stirring process.
In the method for comprehensively utilizing the waste cutting fluid of the granite, the hydrolyzed silane solution is preferably prepared from a silane coupling agent, a pH regulator and a solvent.
The method for comprehensively utilizing the waste cutting fluid of the granite, wherein preferably, the silane coupling agent is gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, the pH regulator is ammonia water, the pH is regulated to 9, and the solvent is an aqueous ethanol solution; the weight ratio is as follows: 0.1-20% of silane coupling agent, 1-20% of water and the balance of ethanol.
Compared with the prior art, the invention has the beneficial effects that: on the basis of analyzing the components of the granite cutting fluid, a sedimentation tank is adopted to separate large-particle calcium carbonate in the granite waste liquid, then an evaporation and membrane filtration combined mode is adopted to separate unsaturated resin and small-particle calcium carbonate, and no flocculating agent is added in the separation process, so that green separation is realized; and according to the characteristics of the separated waste slag, the method is applied in a differentiated manner, the application effect of the waste slag is improved, and the high-value utilization of the slag is realized. In addition, in order to improve the separation effect of the waste residue in the sedimentation tank, the sedimentation tank structure is designed and the organic silicon surfactant is added, so that the flow field of the waste liquid is optimized, the surface tension of the solution is reduced, the rapid separation is realized, the precipitation of unsaturated resin can be avoided, and the high-purity large-particle calcium carbonate waste residue is separated.
Drawings
FIG. 1 is a schematic plan view of a granite slag treatment tank according to example 1 of the present invention;
FIG. 2 is a schematic plan view of a waste residue treatment tank for granite according to example 2 of the present invention.
Detailed Description
The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
A comprehensive utilization method of granite cutting waste liquid comprises the following steps:
(1) adding a low surface energy substance into the granite cutting waste liquid;
(2) for waste liquid such as gypsum, lime and the like, a precipitation process is adopted to separate large-particle waste residues with low unsaturated resin content;
for the solution which is difficult to precipitate and has high content of unsaturated resin, the filler for the water-based architectural coating is modified by a wet method.
In the step (1), the low surface energy substance is an organic silicon surfactant.
The addition amount of the organic silicon surfactant is 0.01-5% of the mass of the granite cutting waste liquid.
The precipitation process in the step (2) is based on the separation of the granite cutting waste liquid in a horizontal flow type precipitation tank.
The advection type sedimentation tank takes the generation amount and components of the granite waste residue liquid as objects, relies on FLUENT software, adopts PISO algorithm simulation to obtain data of flow field traces, suspended matter volume fractions, flow velocity and the like of the granite waste residue liquid in the advection tank, simultaneously simulates the distribution conditions of a concentration field and a flow field in the sedimentation tank, and is designed on the basis of the data.
In the step (2), the particle size of the large-particle waste residue with low content of unsaturated resin is more than 15 μm, and the particle size of the particles which are difficult to precipitate and have high content of unsaturated resin is less than 15 μm.
And (3) preparing small-particle waste residue slurry with the solid content of 30-50% by using the solution which is difficult to precipitate and has high unsaturated resin content in the step (2) in an evaporation and membrane filtration mode, and then carrying out surface chemical modification on waste residue particles. .
The method for carrying out surface chemical modification on the waste residue particles comprises the following steps: adding a hydrolytic silane coupling agent in the stirring process.
The hydrolyzed silane solution is prepared from a silane coupling agent, a pH regulator and a solvent.
The silane coupling agent is gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, the pH regulator is ammonia water, the pH is regulated to 9, and the solvent is an aqueous ethanol solution; the weight ratio is as follows: 0.1-20% of silane coupling agent, 1-20% of water and the balance of ethanol.
Example 1 of the invention:
the flow of the waste residue liquid of the granite company is 1 ton/hour, the mass fraction of solid particles in the waste liquid is 48%, and the flow field trace, the volume fraction of suspended matters, the flow velocity and other data of the waste residue liquid of the granite in the advection pool are obtained by adopting a PISO algorithm simulation based on FLUENT software (a texture model and a standard kappa-epsilon floc flow model), meanwhile, the distribution conditions of the concentration field and the flow field in the sedimentation pool are simulated, and the shape of the sedimentation pool is designed as shown in figure 1. As shown in the figure, when the area I of the sedimentation tank flows to the area I, the width of the area I is narrowed and widened, and then the area I of the sedimentation tank gradually widens again (namely, a narrow-wide-narrow structure), the flow speed of the waste liquid is slowed down when the flow channel is narrowed and widened, the organic silicon surfactant is added at the position, the adding speed is 10 kg/h, and then the flow speed of the waste liquid is quickened due to the narrowing of the width of the flow channel, so that the waste liquid and the surfactant can be uniformly mixed.
The waste residue liquid enters a zone II, namely a sedimentation tank, because the width of a flow channel is increased, the flow velocity of the waste residue liquid is reduced, large particles impact a right measurement area of the zone II and are precipitated, and large-particle calcium carbonate waste residues can be collected at the position; at the moment, the waste liquid contains a large amount of unsaturated resin and small calcium carbonate particles, flows to the area III, and along with the reduction of the width of the flow channel, the flow velocity of the waste residue liquid is increased, so that the precipitation of solid particles is avoided.
And the waste residue liquid enters an IV area, namely a concentration tank. The concentration tank is open, is favorable to water evaporation, and concentration tank one side is connected with the water purification membrane in addition for purify waste water and realize solid-liquid separation. And collecting the high-concentration solution in the concentration tank, and adding a silane solution in the stirring process to prepare the small-particle waste residue slurry with the solid content of 40%.
The large-particle calcium carbonate waste residue collected in the sedimentation tank is subjected to filter pressing, drying and collection, and the precipitate in the sedimentation tank is used as building gypsum and meets the GB T9776-. The small-particle waste residue slurry collected in the concentration tank is used as a filler of the building exterior wall coating, and meets the GB/T9755-2001 water-based exterior wall national standard.
Example 2 of the invention:
the flow of the waste residue liquid of the granite company is 2 tons/hour, the mass fraction of solid particles in the waste liquid is 48%, and the flow field trace, the volume fraction of suspended matters, the flow velocity and other data of the waste residue liquid of the granite in the advection pool are obtained by adopting a PISO algorithm simulation based on FLUENT software (a Mixture model and a standard kappa-epsilon floc flow model), and the shape of the sedimentation pool is designed by simulating the distribution conditions of a concentration field and a flow field in the sedimentation pool (as shown in figure 2). Meanwhile, the organic silicon surfactant is added at the inlet of the waste slag liquid at the speed of 20 kg/h.
The waste residue liquid passes through a sedimentation tank to finish large-particle sedimentation; then preparing small-particle waste residue slurry with the solid content of 30 percent by a concentration tank.
And (3) carrying out filter pressing and drying on the large-particle calcium carbonate waste residues collected in the sedimentation tank to collect sediments in the large-particle calcium carbonate waste residues, wherein the sediments are used as building cement and accord with the GB175-2007 building cement standard. The small-particle waste residue slurry collected in the concentration tank is used as a filler of the road indicating coating, and the prepared coating is good in stability and good in scratch resistance.
Example 3 of the invention:
the flow of the waste residue liquid of the granite company is 5 tons/hour, the mass fraction of solid particles in the waste liquid is 48%, and the flow field trace, the volume fraction of suspended matters, the flow velocity and other data of the waste residue liquid of the granite in the advection pool are obtained by adopting a PISO algorithm simulation based on FLUENT software (a texture model and a standard kappa-epsilon floc flow model), and the concentration field and the flow field distribution condition in the sedimentation pool are simulated at the same time, so that the shape of the sedimentation pool is designed. Meanwhile, the organic silicon surfactant is added at the inlet of the waste slag liquid at the speed of 5 kg/h.
The waste residue liquid passes through a sedimentation tank to finish large-particle sedimentation; then preparing small-particle waste residue slurry with solid content of 40% by a concentration tank.
The large-particle calcium carbonate waste residue collected in the sedimentation tank is subjected to filter pressing, drying and collection of sediments in the sedimentation tank, and the sediments are used as plastic fillers with good dispersibility. The small-particle waste residue slurry collected in the concentration tank is used as a filler of the building exterior wall coating, and meets the GB/T9755-2001 water-based exterior wall national standard.
Example 4 of the invention:
the flow of the waste residue liquid of the granite company is 1 ton/hour, the mass fraction of solid particles in the waste liquid is 48%, and the flow field trace, the volume fraction of suspended matters, the flow velocity and other data of the waste residue liquid of the granite in the advection pool are obtained by adopting a PISO algorithm simulation based on FLUENT software (a texture model and a standard kappa-epsilon floc flow model), and the concentration field and the flow field distribution condition in the sedimentation pool are simulated at the same time, so that the shape of the sedimentation pool is designed. Meanwhile, the organic silicon surfactant is added at the inlet of the waste slag liquid at the speed of 0.1 kg/h.
The waste residue liquid passes through a sedimentation tank to finish large-particle sedimentation; then preparing small-particle waste residue slurry with solid content of 35 percent by a concentration tank.
And (3) carrying out filter pressing and drying on the large-particle calcium carbonate waste residues collected in the sedimentation tank to collect precipitates which are used as the granite filler and meet the JC 908-2013 granite standard. The small-particle waste residue slurry collected in the concentration tank is used as a filler of the building exterior wall coating, and meets the GB/T9755-2001 water-based exterior wall national standard.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (7)
1. A comprehensive utilization method of granite cutting waste liquid is characterized in that: the method comprises the following steps:
(1) adding a low surface energy substance into the granite cutting waste liquid;
(2) for gypsum and lime waste liquid, large-particle waste residues with low unsaturated resin content are separated by adopting a precipitation process;
for the solution which is difficult to precipitate and has high content of unsaturated resin, the filler for the water-based architectural coating is modified by adopting a wet method;
the precipitation process in the step (2) is based on the separation of the granite cutting waste liquid in a horizontal flow type precipitation tank; preparing small-particle waste residue slurry with the solid content of 30-50% by using the solution which is difficult to precipitate and has high content of unsaturated resin in the step (2) in an evaporation and membrane filtration mode, and then carrying out surface chemical modification on waste residue particles;
the advection type sedimentation tank takes the generation amount and components of the granite waste residue liquid as objects, relies on FLUENT software, adopts PISO algorithm simulation to obtain the flow field trace, the volume fraction of suspended matters and the flow speed data of the granite waste residue liquid in the advection tank, simultaneously simulates the distribution condition of a concentration field and a flow field in the sedimentation tank, and is designed on the basis of the flow field trace, the volume fraction and the flow speed data;
the region I of the sedimentation tank flows to a position where the width is gradually widened from narrow to wide and then gradually widened from narrow to wide, the flow speed of the waste liquid is slowed down, the organic silicon surfactant is added at the position, the adding speed is 10 kg/h, and then the flow speed of the waste liquid is quickened due to the narrowing of the width of the flow channel, so that the waste liquid and the surfactant can be uniformly mixed;
the waste residue liquid enters a zone II, namely a sedimentation tank, because the width of a flow channel is increased, the flow velocity of the waste residue liquid is reduced, large particles impact a right measurement area of the zone II and are precipitated, and large-particle calcium carbonate waste residues can be collected at the position; at the moment, the waste liquid contains a large amount of unsaturated resin and small calcium carbonate particles, flows to a region III, and the flow velocity of the waste residue liquid is increased along with the reduction of the width of a flow channel, so that the precipitation of solid particles is avoided;
and enabling the waste residue liquid to enter an IV area, namely a concentration tank, wherein the concentration tank is open and is beneficial to water evaporation, one side of the concentration tank is connected with a water purification film for purifying waste water to realize solid-liquid separation, high-concentration solution in the concentration tank is collected, and silane solution is added in the stirring process, so that the small-particle waste residue slurry with the solid content of 40% is prepared.
2. The comprehensive utilization method of the waste cutting fluid of the granite as claimed in claim 1, which is characterized in that: in the step (1), the low surface energy substance is an organic silicon surfactant.
3. The comprehensive utilization method of the waste cutting fluid of the granite according to claim 2, characterized in that: the addition amount of the organic silicon surfactant is 0.01-5% of the mass of the granite cutting waste liquid.
4. The comprehensive utilization method of the waste cutting fluid of the granite as claimed in claim 1, which is characterized in that: in the step (2), the particle size of the large-particle waste residue with low content of unsaturated resin is more than 15 μm, and the particle size of the particles which are difficult to precipitate and have high content of unsaturated resin is less than 15 μm.
5. The comprehensive utilization method of the waste cutting fluid of the granite as claimed in claim 1, which is characterized in that: the method for carrying out surface chemical modification on the waste residue particles comprises the following steps: adding a hydrolytic silane coupling agent in the stirring process.
6. The comprehensive utilization method of the waste cutting fluid of the granite according to claim 5, characterized in that: the hydrolyzed silane solution is prepared from a silane coupling agent, a pH regulator and a solvent.
7. The comprehensive utilization method of the waste cutting fluid of the granite as claimed in claim 6, characterized in that: the silane coupling agent is gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, the pH regulator is ammonia water, the pH is regulated to 9, and the solvent is an aqueous ethanol solution;
the weight ratio is as follows: 0.1-20% of silane coupling agent, 1-20% of water and the balance of ethanol.
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| CN114276727B (en) * | 2021-11-20 | 2023-04-14 | 广西科学院 | Waterproof and anti-fouling water-based paint based on waste artificial granite powder and preparation method thereof |
| CN114276705B (en) * | 2021-11-20 | 2023-01-31 | 广西科学院 | Method for preparing bi-component microorganism-induced inorganic coating by using artificial granite waste residue |
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| KR20020095579A (en) * | 2001-06-15 | 2002-12-27 | 이광근 | Waste water treatment system for imitation stone |
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| KR20020095579A (en) * | 2001-06-15 | 2002-12-27 | 이광근 | Waste water treatment system for imitation stone |
| CN108675480A (en) * | 2018-07-19 | 2018-10-19 | 广东豪天新型材料有限公司 | A kind of stone processed sewage treatment system |
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