CN114409991A - Method for preparing polyolefin composite material by modifying bauxite ore washing mud - Google Patents
Method for preparing polyolefin composite material by modifying bauxite ore washing mud Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 39
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- 239000008394 flocculating agent Substances 0.000 claims description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 5
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- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
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- 229920001910 maleic anhydride grafted polyolefin Polymers 0.000 claims description 2
- 229920005996 polystyrene-poly(ethylene-butylene)-polystyrene Polymers 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
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- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 2
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention discloses a method for preparing a polyolefin composite material by modifying bauxite ore washing mud, which comprises the following steps: the bauxite ore washing mud is pretreated to obtain bauxite ore washing mud powder, then a coupling agent, a compatilizer and a lubricant are added for modification treatment to obtain active ore washing mud powder, then a polyolefin raw material which is 60-120% of the mass of the active ore washing mud powder is added, the master batch is prepared by extrusion molding, then a polyolefin raw material which is 300-600% of the mass of the active ore washing mud powder is added, and the bauxite ore washing mud/polyolefin composite material is prepared by a molding process. The method is simple to operate, can improve the resource utilization level of the bauxite ore washing mud, can improve the physical and chemical performance indexes of the polyolefin material, and has good economic benefit, environmental benefit and social benefit.
Description
Technical Field
The invention relates to the technical field of resource utilization of solid waste-bauxite ore washing mud, in particular to a method for preparing a polyolefin composite material by modifying the bauxite ore washing mud.
Background
The inorganic mineral powder filler is the second most consumption raw material which is second to resin in the plastic industry at present, increases the consumption of mineral powder, saves resin raw materials, develops plastic products with special functionality and high added value, and is the development trend of the plastic industry. The long-term stockpiling of the bauxite ore washing mud not only easily causes environmental pollution, but also has potential safety hazards such as a tailing pond and the like; the characteristics of the clay mineral with a lamellar structure as a main component, good dispersibility and fine granularity are utilized to prepare the polyolefin plastic composite material, so that a large amount of stone energy materials such as resin and the like can be saved, and the mechanical property index of the composite material can be improved.
At present, the research on the bauxite ore washing mud mainly focuses on the dehydration and solidification aspects of the dehydration of the bauxite ore washing mud. The method is characterized in that ageing and the like explore the sedimentation effect of organic flocculant PAM with different configuration concentrations on bauxite slime, a two-section adding mode is provided, low-concentration PAM liquid medicine is added firstly to quickly form small floccules, and then high-concentration liquid medicine is added to polymerize the small floccules, so that the use amount of PAM powder is reduced, and a better dehydration effect can be achieved. The settlement test method is adopted to study the pH value and dosage of Yanqing, and the like, and the coagulant aid is not added and the inorganic coagulant (FeSO) is added under different pH values and dosages4·7H2O, PAC and PFS) and an organic flocculant PAM on the sedimentation of bauxite tailings, the fact that the surface electrical property of particles is an important factor influencing the sedimentation of the tailings is found, and the tailings can be better settled by adjusting the pH =7 of ore pulp without adding a coagulant aid. Li Wangxing invents a method for stockpiling tailings of ore-washing of bauxiteThe method of the invention requires that underflow with solid content of more than 600 g/L is obtained by adopting pretreatment modes of thickening, concentration, adding a dehydrating agent and the like, and then the sediment is cured. The curing agent consists of a curing base material and a curing auxiliary agent, wherein the curing base material is lime powder, the curing auxiliary agent is gypsum, fly ash, slag powder and sulfate, and the weight ratio of the lime powder base material to the curing auxiliary agent is 50-100: 0-50, the granularity of the curing agent is required to be less than 0.5mm, and the curing agent is mixed with the pretreated bottom mud, uniformly stirred, compacted and cured to realize dry stacking of bauxite ore washing mud (zl 200610156329). The methods only focus on the research of the dehydration and solidification technology of the bauxite ore washing mud, and no report is found on the research of how to perform resource utilization on the bauxite ore washing mud, particularly on the research of preparing polyolefin composite materials.
Disclosure of Invention
The invention aims to provide a method for preparing a polyolefin composite material by modifying bauxite ore washing mud, which prepares the bauxite ore washing mud which is a large amount of industrial solid waste into the polyolefin composite material, not only can provide a reliable way for resource utilization of the bauxite ore washing mud, but also plays roles of saving raw materials, reducing cost and the like for production of the polyolefin composite material, and has wide development prospect.
The technical scheme of the invention is as follows:
the method for preparing the polyolefin composite material by modifying the bauxite ore washing mud comprises the following steps: the bauxite ore washing mud is pretreated to obtain bauxite ore washing mud powder, then a coupling agent, a compatilizer and a lubricant are added for modification treatment to obtain active ore washing mud powder, then a polyolefin raw material which is 60-120% of the mass of the active ore washing mud powder is added, the master batch is prepared by extrusion molding, then a polyolefin raw material which is 300-600% of the mass of the active ore washing mud powder is added, and the bauxite ore washing mud/polyolefin composite material is prepared by a molding process.
The raw material bauxite ore washing mud is the mud separated from the stacked bauxite after ore washing and ore dressing, and the polyolefin raw material is polyethylene and/or propylene resin.
The bauxite ore washing mud pretreatment comprises the following steps: the bauxite ore washing mud is subjected to flocculation precipitation and plate-frame filter pressing, then is dried at the temperature of 100 ℃ and 125 ℃ to ensure that the water content is less than 5 percent, and is ground to obtain powder with the D50 granularity index of 500-mesh and 1000-mesh, so that the bauxite ore washing mud powder is obtained.
The flocculating agent used in the flocculation process is a polyacrylamide flocculating agent and/or a polyaluminium chloride flocculating agent.
The modification treatment comprises the following steps: putting the bauxite ore-washing mud powder into a high-speed mixer, stirring at a high speed for 5-20min at 60-90 ℃, then adding a coupling agent, a compatilizer and a lubricant, and continuously mixing and stirring at a high speed for 30-90min at 70-110 ℃ to obtain the active ore-washing mud powder.
The process of preparing the master batch by extrusion molding comprises the following steps: according to the mass ratio of the active ore washing mud powder to the polyolefin raw material of 100:90-110, adding the polyolefin raw material into the active ore washing mud powder, continuously mixing and stirring at a high speed for 10-60min at the temperature of 70-110 ℃, and then banburying for 5-30min at the temperature of 140-300 ℃ and the rotating speed of 30-100 rpm; extruding to obtain bauxite ore washing mud/polyolefin master batch. The extrusion can adopt a double-screw extruder, and the extrusion conditions are that the feeding frequency range is 5-15, the host current is 15-50, the host rotating speed is 30-60, and the temperature is 150-;
the dosage of the coupling agent, the lubricant and the compatilizer is 0.01 to 20 percent, 0.5 to 10 percent and 0.05 to 5 percent of the weight of the bauxite ore washing mud powder respectively.
The coupling agent is one or a mixture of more than one of silane coupling agent, titanate coupling agent, aluminate coupling agent or rare earth coupling agent; the lubricant is one or a mixture of more than one of paraffin, polyethylene wax, white oil, stearic acid or stearate; the compatilizer is maleic anhydride grafted polyolefin or copolymer with epoxy groups.
The molding process is extrusion molding or injection molding.
The pressure of the extrusion molding is 15-30Mpa, the temperature of polyethylene is 180-200 ℃, and the temperature of polypropylene is 190-220 ℃; the pressure of the injection molding is 50-80MPa, the temperature of the polyethylene is 180-200 ℃, and the temperature of the polypropylene is 190-220 ℃.
The invention has the beneficial effects that:
(1) the invention prepares the bauxite ore washing mud into the polyolefin composite material after modification treatment, and provides a favorable way for recycling the bauxite ore washing mud.
(2) According to the preparation method provided by the invention, the polyolefin raw material is added twice, and after twice molding treatment, bauxite ore washing mud powder is better compatible with a polyolefin matrix and is uniformly dispersed, the binding force of the ore washing mud and the polymer matrix is stronger, and the performance of the obtained polyolefin composite material is better.
(3) The method of the invention has simple operation, can improve the physical and chemical performance index of the material, can reduce the production cost of enterprises and improve the economic benefit of the enterprises.
Drawings
FIG. 1 is a scanning electron micrograph of a bauxite ore washing mud/low density polyethylene of a control example of example 5;
FIG. 2 is a scanning electron micrograph of bauxite ore washing mud/low density polyethylene prepared by the process of example 5;
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1
The method for preparing the polyolefin composite material by modifying the bauxite ore washing mud comprises the following steps: flocculating and precipitating bauxite ore washing mud by a polyacrylamide flocculant, carrying out plate-and-frame filter pressing until the water content is about 30%, then drying at 100 ℃ until the water content is less than 5%, grinding to obtain powder with the D50 granularity index of 500 meshes to obtain bauxite ore washing mud powder, putting the bauxite ore washing mud powder into a high-speed mixer, carrying out high-speed stirring at 60 ℃ for 5min, adding a silane 550 coupling agent, polyethylene wax, stearic acid and maleic anhydride grafted polyethylene according to 0.01%, 0.5% and 0.05% of the bauxite ore washing mud powder respectively, carrying out high-speed stirring at 70 ℃ for 30min to obtain active ore washing mud powder, adding high-density polyethylene into the active ore washing mud powder according to the mass ratio of 100:60 of the active ore washing mud powder to the high-density polyethylene, carrying out high-speed stirring at 70 ℃ for 10min, carrying out banburying by an internal mixer for 25min, and then extruding by using a double-screw extruder under the extrusion conditions of a feeding frequency range of 5-10, a main machine current of 30-50, a main machine rotating speed of 40-50 and a temperature of 190 plus materials of 200 ℃ to obtain bauxite ore washing mud/high-density polyethylene master batch and obtain bauxite ore washing mud/polyolefin master batch, then adding high-density polyethylene with the mass equivalent to 300 percent of the mass of the active ore washing mud powder, and performing injection molding by using an injection molding machine to obtain the bauxite ore washing mud/high-density polyethylene composite material plate.
Example 2
The method for preparing the polyolefin composite material by modifying the bauxite ore washing mud comprises the following steps: flocculating and precipitating bauxite ore washing mud by a polyacrylamide flocculant and a polyaluminium chloride flocculant, performing filter pressing by a plate frame until the water content is about 30%, then drying at 110 ℃ until the water content is less than 5%, grinding to obtain powder with the D50 granularity index of 800 meshes, namely bauxite ore washing mud powder, putting the bauxite ore washing mud powder into a high-speed mixer, stirring at 80 ℃ for 10min at high speed, adding a silane 550 coupling agent, polyethylene wax, sodium stearate and a maleic anhydride polyethylene grafting agent according to 0.5%, 5% and 0.05% of the mass of the bauxite ore washing mud powder, continuously mixing and stirring at 80 ℃ for 30min at high speed, so as to obtain active ore washing mud powder, adding high-density polyethylene (HD 5502 XA) into the active ore washing mud powder according to the mass ratio of 100:100 of the active ore washing mud powder to the high-density polyethylene, continuously mixing at 90 ℃ for 20min, banburying for 20min by an internal mixer, extruding by a double-screw extruder under the extrusion conditions of 10-15 feeding frequency range, 15-20 host current, 30-40 host rotating speed and 150-160 ℃ to obtain bauxite ore washing mud/high-density polyethylene master batch, obtaining bauxite ore washing mud/polyolefin master batch, adding high-density polyethylene (HD 5502 XA) with the mass equivalent to 300-600% of active ore washing mud powder, and performing injection molding by an injection molding machine to obtain the bauxite ore washing mud/high-density polyethylene composite material plate.
Through analysis and detection, the bauxite ore washing mud/high-density polyethylene composite material prepared in the embodiment has the tensile strength of 23.5MPa, the impact strength of 51KJ/m2, the elongation at break of 184% and the tear strength of 43 KN/m.
Example 3
The method for preparing the polyolefin composite material by modifying the bauxite ore washing mud comprises the following steps: flocculating and precipitating bauxite ore washing mud by using a polyaluminium chloride flocculant, performing filter pressing by using a plate frame, drying at 125 ℃ until the water content is less than 5%, grinding to obtain powder with the D50 granularity index of 1000 meshes, namely bauxite ore washing mud powder, putting the bauxite ore washing mud powder into a high-speed mixer, stirring at a high speed for 20min at 90 ℃, adding a titanate coupling agent, an aluminate coupling agent, paraffin wax, polyethylene wax and a maleic anhydride polypropylene grafting agent according to 10%, 10% and 5% of the mass of the bauxite ore washing mud powder respectively, continuously mixing and stirring at a high speed for 90min at 110 ℃ to obtain active ore washing mud powder, adding polypropylene resin into the active ore washing mud powder according to the mass ratio of 100: 120 of the active ore washing mud powder to the polypropylene resin, continuously mixing and stirring at a high speed for 60min at 110 ℃, banburying and extruding, obtaining bauxite ore washing mud/polypropylene master batch, then adding a polypropylene raw material which is 500 percent of the mass of the active ore washing mud powder, and preparing the bauxite ore washing mud/polypropylene composite material through a forming process.
Example 4
The method for preparing the polyolefin composite material by modifying the bauxite ore washing mud comprises the following steps: flocculating and precipitating bauxite ore washing mud by a polyacrylamide flocculant and a polyaluminium chloride flocculant, performing plate-and-frame filter pressing until the water content is about 30%, then drying at 110 ℃ until the water content is less than 5%, grinding to obtain powder with the D50 granularity index of 1000 meshes, namely bauxite ore washing mud powder, putting the bauxite ore washing mud powder into a high-speed mixer, stirring at 60 ℃ for 20min at a high speed, adding a silane 550 coupling agent, polyethylene wax, sodium stearate and maleic anhydride grafted polyethylene according to 1.0%, 2% and 0.1% of the mass of the bauxite ore washing mud powder, continuously mixing and stirring at a high speed for 30min at 80 ℃ to obtain active ore washing mud powder, adding low-density polyethylene (DFDA 7050) into the active ore washing mud powder according to the mass ratio of 100:90 of the active ore washing mud powder to the low-density polyethylene, continuously mixing and stirring at a high speed for 30min at 85 ℃, banburying for 20min by a banbury mixer, extruding by a double-screw extruder, extruding by the double-screw extruder under the conditions of feeding frequency range of 8-10, host current of 30-40, host rotation speed of 45-50 and temperature of 180-.
Comparative example: flocculating and precipitating bauxite ore washing mud by a polyacrylamide flocculant, carrying out plate-and-frame filter pressing until the water content is about 30%, then drying at 110 ℃ until the water content is less than 5%, grinding to obtain powder with a D50 granularity index of 1000 meshes to obtain bauxite ore washing mud powder, putting the bauxite ore washing mud powder into a high-speed mixer, carrying out high-speed stirring at 60 ℃ for 20min, adding a silane 550 coupling agent, polyethylene wax, sodium stearate and maleic anhydride polyethylene grafting agent according to 1.0%, 2% and 0.1% of the mass of the bauxite ore washing mud powder respectively, carrying out high-speed stirring at 80 ℃ for 30min to obtain active ore washing mud powder, adding low-density polyethylene (DFDA 7050) into the active ore washing mud powder according to the mass ratio of 100:590 of the active ore washing mud powder to the low-density polyethylene, carrying out high-speed stirring at 85 ℃ for 30min, carrying out banbury mixer for 20min, and extruding by using a double-screw extruder to obtain the bauxite ore washing slime/low-density polyethylene contrast material.
Through analysis and detection, the surface of the bauxite ore washing slurry/low-density polyethylene control material prepared by the control case is rough, the tensile strength is 12MPa, the impact strength is 41KJ/m2, the elongation at break is 84%, and the tear strength is 23 KN/m.
The bauxite ore washing mud/linear low density polyethylene composite material prepared in the embodiment has a smooth surface, the tensile strength of 34MPa, the impact strength of 28KJ/m2, the elongation at break of 589% and the tear strength of 84 KN/m.
Therefore, the bauxite ore washing mud/low-density polyethylene composite material prepared by secondary forming in the embodiment has a smooth surface, and the performances such as tensile strength and the like are greatly superior to those of the control case.
Example 5
The method for preparing the polyolefin composite material by modifying the bauxite ore washing mud comprises the following steps: flocculating and precipitating bauxite ore washing mud by a polyacrylamide flocculant and a polyaluminium chloride flocculant, performing plate-and-frame filter pressing, drying at 105 ℃ until the water content is less than 5%, grinding to obtain powder with a D50 granularity index of 1000 meshes to obtain bauxite ore washing mud powder, putting the bauxite ore washing mud powder into a high-speed mixer, stirring at 80 ℃ for 15min at high speed, adding silane 560 coupling agent, white oil and maleic anhydride polypropylene grafting agent according to 1.0%, 2% and 0.1% of the bauxite ore washing mud powder respectively, continuously mixing and stirring at 80 ℃ for 30min to obtain active ore washing mud powder, adding polypropylene resin into the active ore washing mud powder according to the mass ratio of 100: 110 of the active ore washing mud powder to the polypropylene resin, continuously mixing and stirring at 110 ℃ for 60min at high speed, banburying and extruding to obtain bauxite ore washing mud/polypropylene master batch, then adding a polypropylene raw material which is 450 percent of the mass of the active ore washing mud powder, and preparing the bauxite ore washing mud/polypropylene composite material through a molding process.
The bauxite ore washing mud/polypropylene control material prepared by the control case is analyzed by a scanning electron microscope through a low-temperature fracture surface to find that: the ore washing mud is not well coated by the polypropylene resin, is not uniformly dispersed and has more aggregates;
scanning electron microscope analysis is carried out on the bauxite ore washing mud/polypropylene composite material prepared in the embodiment through a low-temperature fracture surface to find that: the washing slime is well coated by polypropylene resin, and the dispersion is relatively uniform.
Through analysis and detection, the bauxite ore washing mud/polypropylene composite material prepared in the embodiment has the tensile strength of 20MPa, the bending strength of 55MPa and the impact strength of 21KJ/m2。
Claims (10)
1. A method for preparing a polyolefin composite material by modifying bauxite ore washing mud is characterized by comprising the following steps: the bauxite ore washing mud is pretreated to obtain bauxite ore washing mud powder, then a coupling agent, a compatilizer and a lubricant are added for modification treatment to obtain active ore washing mud powder, then a polyolefin raw material which is 60-120% of the mass of the active ore washing mud powder is added, the master batch is prepared by extrusion molding, then a polyolefin raw material which is 300-600% of the mass of the active ore washing mud powder is added, and the bauxite ore washing mud/polyolefin composite material is prepared by a molding process.
2. The method for preparing polyolefin composite material by modifying bauxite ore washing mud according to claim 1, wherein: the raw material bauxite ore washing mud is the mud separated from the stacked bauxite after ore washing and ore dressing, and the polyolefin raw material is polyethylene and/or propylene resin.
3. The method for preparing polyolefin composite material by modifying bauxite ore washing mud according to claim 1, wherein the bauxite ore washing mud pretreatment comprises the following steps: the bauxite ore washing mud is subjected to flocculation precipitation and plate-frame filter pressing, then is dried at the temperature of 100 ℃ and 125 ℃ to ensure that the water content is less than 5 percent, and is ground to obtain powder with the D50 granularity index of 500-mesh and 1000-mesh, so that the bauxite ore washing mud powder is obtained.
4. The method for preparing polyolefin composite material by modifying bauxite ore washing mud according to claim 3, wherein: the flocculating agent used in the flocculation process is a polyacrylamide flocculating agent and/or a polyaluminium chloride flocculating agent.
5. The method for preparing polyolefin composite material by modifying bauxite ore washing mud according to claim 1, wherein the modification treatment comprises the following steps: putting the bauxite ore-washing mud powder into a high-speed mixer, stirring at a high speed for 5-20min at 60-90 ℃, then adding a coupling agent, a compatilizer and a lubricant, and continuously mixing and stirring at a high speed for 30-90min at 70-110 ℃ to obtain the active ore-washing mud powder.
6. The method for preparing polyolefin composite material by modifying bauxite ore washing mud according to claim 1, wherein the process of extrusion molding to prepare master batch comprises the following steps: according to the mass ratio of the active ore washing mud powder to the polyolefin raw material of 100:90-110, adding the polyolefin raw material into the active ore washing mud powder, continuously mixing and stirring at a high speed for 10-60min at the temperature of 70-110 ℃, and then banburying for 5-30min at the temperature of 140-300 ℃ and the rotating speed of 30-100 rpm; extruding to obtain bauxite ore washing mud/polyolefin master batch.
7. The method for preparing polyolefin composite material by modifying bauxite ore washing mud according to claim 1, wherein: the dosage of the coupling agent, the lubricant and the compatilizer is 0.01 to 20 percent, 0.5 to 10 percent and 0.05 to 5 percent of the weight of the bauxite ore washing mud powder respectively.
8. The method of claim 7, wherein the bauxite ore washing mud is modified to prepare a polyolefin composite material, and the method comprises the following steps: the coupling agent is one or a mixture of more than one of silane coupling agent, titanate coupling agent, aluminate coupling agent or rare earth coupling agent; the lubricant is one or a mixture of more than one of paraffin, polyethylene wax, white oil, stearic acid or stearate; the compatilizer is maleic anhydride grafted polyolefin or copolymer with epoxy groups.
9. The method for preparing polyolefin composite material by modifying bauxite ore washing mud according to claim 1, wherein: the molding process is extrusion molding or injection molding.
10. The method of claim 9, wherein the bauxite ore washing mud is modified to prepare a polyolefin composite material, and the method comprises the following steps: the pressure of the extrusion molding is 15-30Mpa, the temperature of polyethylene is 180-200 ℃, and the temperature of polypropylene is 190-220 ℃; the pressure of the injection molding is 50-80MPa, the temperature of the polyethylene is 180-200 ℃, and the temperature of the polypropylene is 190-220 ℃.
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