Ionic type rare earth mine crack blocking material and using method and application thereof

Abstract

The invention relates to an ionic type rare earth ore crack plugging material as well as a use method and application thereof. The crack plugging material comprises the following independent components: oily polyurethane, a dispersing agent, a mineral additive and water. The invention develops a brand new blocking material for ion type rare earth mine cracks, and the blocking agent is prepared by taking the mineral additive as the raw material and combining the oily polyurethane and other materials to directly block cracks and fracture zones; the characteristics of good foaming effect of the oily polyurethane, the dispersing agent and the water and the benefit that the mineral additive serving as a framework material can greatly improve the mechanical strength of the plugging agent are utilized, so that the plugging agent has the advantages of good plugging effect on mine cracks and fracture zones, low price, simplicity in operation and environment friendliness.

Description

Technical Field

[0001] The invention belongs to the technical field of ionic rare earth mining, and relates to an ionic rare earth ore fissure plugging material and a use method and application thereof. Background Art

[0002] Rare earth elements have many excellent optical, electrical, magnetic, nuclear and other properties due to their special atomic structure and extremely rich electronic energy levels. In addition, they are very active in chemical properties and can be combined with other elements to form new materials with diverse varieties, superior functions and wide applications. They play a very important role in many fields. Ionic rare earth mines, which are mainly distributed in seven provinces in southern my country, are unique in that the reserves of medium and heavy rare earths such as yttrium and terbium are extremely rich, and the rare earth elements are adsorbed on the surface of clay minerals mainly composed of kaolinite and montmorillonite in the form of hydrated cations or hydroxyl hydrated cations. They have many advantages such as complete distribution of rare earth elements, shallow burial, high comprehensive utilization value and easy mining.

[0003] In recent years, ionic rare earth ores have been mined mainly using in-situ leaching technology. The in-situ leaching process does not require excavation of mines and has the advantages of low cost, high production efficiency, and little environmental damage. However, due to the presence of broken zones in the weathering layer of ionic rare earth mines and cracks in the bedrock floor, there will be leaching blind areas and serious loss of leaching liquid during the in-situ leaching process, which not only greatly reduces the rare earth recovery rate, but also causes serious environmental pollution.

[0004] Sealing the broken zones in the weathering layer of ionic rare earth mines and the cracks in the bedrock floor to avoid the disorderly loss of rare earth mother liquor is an effective way to expand the scope of application of in-situ leaching technology and achieve green and efficient mining of ionic rare earths.

[0005] CN110105016A discloses a barrier wall material and its application method for ion rare earth ore contaminated sites, digging trenches within the barrier range of the mining area, using cement, silicon powder, in-situ cover soil, water and other raw materials. This method can seal the lost leaching mother liquor within the barrier wall, but this method cannot fundamentally solve the problem of leaching mother liquor leakage and low rare earth recovery rate caused by cracks in the bedrock and broken zones in the weathering layer. At the same time, there are also problems such as large construction volume and long time consumption.

[0006] CN110171944A discloses an ionic rare earth anti-seepage grouting material and its preparation method, wherein fine-grained clay minerals, cement, water, activator, and composite additives are selected to prepare the anti-seepage grouting material, and the material is injected into the rock layer containing cracks and the broken zone to achieve the purpose of plugging leakage and preventing seepage. However, the required fine-grained clay minerals need to be screened multiple times to obtain, which not only requires a variety of screening equipment, but also requires the additional addition of dispersants, resulting in cumbersome preparation procedures and increased costs.

[0007] CN114776333A discloses an ionic rare earth in-situ leaching anti-crack and anti-seepage grouting material and its preparation method, wherein waste tailings fine waste slag powder, fly ash, fine mineral powder, water-based epoxy resin emulsion, activator and exciter are selected to prepare the anti-crack and anti-seepage grouting material, which can be applied to the anti-seepage grouting project of the bedrock floor of ionic rare earth mines. However, this method requires grinding the raw materials, adding activators and activating them at high temperatures, which not only requires high-temperature equipment, but also high-temperature conditions will increase the probability of side reactions and reduce the utilization rate of raw materials.

[0008] In view of the shortcomings of the above materials and plugging methods, it is very necessary to develop new plugging materials that can solve the problem of rare earth mother liquor leakage from the root. Summary of the invention

[0009] In view of the shortcomings of the prior art, the present invention aims at the problem that a large amount of rare earth mother liquor is lost due to cracks in the bedrock and broken zones in the weathering layer during the in-situ leaching of ionic rare earth ores. An ionic rare earth ore crack plugging material and its use method and application are provided. The plugging material can plug the cracks and broken zones in the rare earth ore, avoid the loss of rare earth mother liquor, improve the resource recovery rate and reduce the pollution of the ecological environment around the mining area.

[0010] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0011] In a first aspect, the present invention provides an ionic rare earth mineral fissure plugging material, wherein the fissure plugging material comprises the following independent components: oily polyurethane, a dispersant, a mineral additive and water.

[0012] The present invention develops a new plugging material for ionic rare earth mine fissures, which uses mineral additives as raw materials combined with oily polyurethane and other materials to prepare plugging agents to directly plug fissures and broken zones. It utilizes the good foaming effects of oily polyurethane, dispersant and water, and the mineral additives as skeleton materials can greatly improve the mechanical strength of the plugging agent, making it have the advantages of good plugging effect on mine fissures and broken zones, low price, simple operation, and green environmental protection. It can solve the problem of rare earth mother liquor leakage from the root, greatly improve the scope of application of in-situ mining technology, and lay the foundation for realizing green and efficient mining of ionic rare earths.

[0013] Preferably, the fracture plugging material comprises the following components independently in parts by weight: 5-10 parts of oily polyurethane, 20-40 parts of dispersant, 50-250 parts of mineral additives and 0.2-2 parts of water.

[0014] The weight percentage of the oily polyurethane can be 5, 6, 7, 8, 9, 10, etc.; the weight percentage of the dispersant can be 20, 25, 30, 32, 35, 40, etc.; the weight percentage of the mineral additive can be 50, 80, 100, 120, 150, 200, 250, etc.; the weight percentage of water can be 0.2, 0.5, 0.8, 1, 1.2, 1.5, 1.8, 2, etc. Other specific point values ​​within the above numerical ranges can be selected, and they will not be repeated here.

[0015] When the components of the fissure plugging material involved in the present invention are used in the above-mentioned specific mass ratio, the plugging effect on mine fissures and broken zones is better.

[0016] Preferably, the raw materials for preparing the oily polyurethane include: isocyanate, polyether polyol and a catalyst.

[0017] Preferably, the isocyanate comprises any one of diphenylmethane diisocyanate or polyphenyl polymethylene polyisocyanate or a combination of both, more preferably polyphenyl polymethylene polyisocyanate.

[0018] Preferably, the polyether polyol includes any one of polyether 4110, polyether N303 or polypropylene glycol 400, or a combination of at least two thereof; more preferably, a combination of polyether 4110 and polyether N303.

[0019] When the isocyanate in the raw material for preparing the oily polyurethane is selected from polyphenyl polymethylene polyisocyanate and the polyether polyol is selected from a combination of polyether 4110 and polyether N303, the fissure plugging material has a better plugging effect on mine fissures and broken zones. And when the usage amount is the same, the combination of polyether 4110 and polyether N303 has a better effect than single polyether 4110 or single polyether N303.

[0020] Preferably, the catalyst includes an amine catalyst, an organotin catalyst or an organobismuth catalyst. Amine catalysts include ethylenediamine, bis(2,2-morpholineethyl) ether, triethylenediamine, dimethylethanolamine, N-methylmorpholine, N,N-dimethylcyclohexylamine, etc.; organotin catalysts include stannous octoate, stannous oleate, dibutyltin dilaurate, etc.; organobismuth catalysts include bismuth neodecanoate, bismuth isooctanoate, etc.

[0021] Preferably, the dispersant includes any one of dichloromethane, ethyl acetate or acetone, or a combination of at least two thereof; more preferably, a combination of ethyl acetate and acetone.

[0022] When the dispersant in the components of the fissure plugging material is a combination of ethyl acetate and acetone, the fissure plugging material has a better plugging effect on mine fissures and broken zones.

[0023] Preferably, the volume ratio of ethyl acetate to acetone is (1-3):1.

[0024] Preferably, the mineral additive is fully weathered layer soil of ionic rare earth ore.

[0025] Compared with clay minerals, waste tailings fine slag powder, fly ash, quartz and other skeleton materials, the present invention selects ionic rare earth ore fully weathered layer mineral soil as the skeleton material, the raw materials are easy to obtain, the interference to the mine environment is small, and the sealing effect on mine fissures and broken zones is better.

[0026] In a second aspect, the present invention provides a method for using the ionic rare earth ore fissure plugging material according to the first aspect, the method comprising the following steps, and a schematic diagram of its preparation process and method of use is shown in FIG. Figure 1 As shown (wherein, 1- grouting hole, 2- topsoil layer, 3- weathering layer, 4- fissure, 5- bedrock, 6- groundwater layer).

[0027] (1) mixing the oily polyurethane with a dispersant to obtain a first mixture;

[0028] (2) mixing the first mixture with a mineral additive to obtain a second mixture;

[0029] (3) mixing the second mixture with water to obtain a third mixture;

[0030] (4) Injecting the third mixture into the cracks of the ionic rare earth ore to perform foaming and plugging.

[0031] Preferably, the mixing in step (1) is carried out in a stirring manner.

[0032] Preferably, the mixing in step (1) is carried out at 20-28°C (e.g., 20°C, 22°C, 23°C, 25°C, 26°C, 28°C, etc.) for 1-3 min (e.g., 1 min, 2 min, 2.5 min, 3 min, etc.).

[0033] Preferably, the mixing in step (2) is carried out by stirring.

[0034] Preferably, the mixing in step (2) is carried out at 20-28°C (e.g., 20°C, 22°C, 23°C, 25°C, 26°C, 28°C, etc.) for 5-7 min (e.g., 5 min, 6 min, 6.5 min, 7 min, etc.).

[0035] Preferably, the mixing in step (3) is carried out by stirring.

[0036] Preferably, the mixing in step (3) is carried out at 20-28°C (e.g., 20°C, 22°C, 23°C, 25°C, 26°C, 28°C, etc.) for 2-3 min (e.g., 2 min, 2.5 min, 3 min, etc.).

[0037] Other specific point values ​​within the above numerical ranges can be selected and will not be described in detail here.

[0038] In a third aspect, the present invention provides the use of the ionic rare earth ore fissure plugging material described in the first aspect in plugging bedrock fissures and / or weathering layer fracture zones in an ionic rare earth in-situ mining project.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The present invention develops a new plugging material for ionic rare earth mine fissures, which uses mineral additives as raw materials combined with oily polyurethane and other materials to prepare plugging agents to directly plug fissures and broken zones. It utilizes the good foaming effects of oily polyurethane, dispersant and water, and the mineral additives as skeleton materials can greatly improve the mechanical strength of the plugging agent, making it have the advantages of good plugging effect on mine fissures and broken zones, low price, simple operation, and green environmental protection. It can solve the problem of rare earth mother liquor leakage from the root, greatly improve the scope of application of in-situ mining technology, and lay the foundation for realizing green and efficient mining of ionic rare earths. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the preparation process and use method of the ionic rare earth ore fissure plugging material of the present invention;

[0042] Among them, 1- grouting hole, 2- topsoil layer, 3- weathering layer, 4- fissure, 5- bedrock, 6- groundwater layer. DETAILED DESCRIPTION

[0043] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0044] The sources of some of the raw materials involved in the following preparation examples, embodiments and comparative examples are as follows:

[0045] Polyphenyl polymethylene polyisocyanate was purchased from Wanhua Chemical Group Co., Ltd.

[0046] Diphenylmethane diisocyanate was purchased from Wanhua Chemical Group Co., Ltd.

[0047] Polyether 4110 was purchased from Yinuowei Polyurethane Co., Ltd.;

[0048] Polyether N303 was purchased from Inoway Polyurethane Co., Ltd.

[0049] Preparation Example 1

[0050] In this preparation example, an oily polyurethane is prepared. The raw materials for the preparation are: 40 parts of polyphenyl polymethylene polyisocyanate, 4 parts of polyether 4110, and 0.05 parts of dibutyltin dilaurate.

[0051] The preparation method is as follows:

[0052] Dehydrate polyether 4110 at 85°C and vacuum degree -0.095 MPa until there is no large amount of bubbles escaping from the system and the system becomes clear and transparent.

[0053] Add the dehydrated polyether 4110 into a dry flask, add a measured amount of polyphenyl polymethylene polyisocyanate, react at 60°C for 0.5h, then slowly heat to 80°C for 2h. Add the catalyst dibutyltin dilaurate, and continue stirring at 80°C for 1h.

[0054] Preparation Example 2

[0055] In this preparation example, an oily polyurethane is prepared. The raw materials for the preparation are: 40 parts of polyphenyl polymethylene polyisocyanate, 4 parts of polyether 4110, and 0.05 parts of bis(2,2-morpholineethyl) ether.

[0056] The preparation method is as follows:

[0057] Dehydrate polyether 4110 at 85°C and vacuum degree -0.095 MPa until there is no large amount of bubbles escaping from the system and the system becomes clear and transparent.

[0058] Add the dehydrated polyether 4110 into a dry flask, add a measured amount of polyphenyl polymethylene polyisocyanate, react at 60°C for 0.5h, then slowly heat to 80°C for 2h. Add the catalyst dibutyltin dilaurate, and continue stirring at 80°C for 1h.

[0059] Preparation Example 3

[0060] In this preparation example, an oily polyurethane is prepared. The raw materials for the preparation are: 33 parts of polyphenyl polymethylene polyisocyanate, 4 parts of polypropylene glycol 400, and 0.04 parts of ethylenediamine.

[0061] The preparation method is as follows:

[0062] Dehydrate polypropylene glycol 400 at 85° C. and a vacuum degree of -0.095 MPa until the system becomes clear and transparent without escaping a large amount of bubbles.

[0063] Add the dehydrated polypropylene glycol 400 into a dry flask, add a measured amount of polyphenyl polymethylene polyisocyanate, react at 60°C for 0.5h, then slowly heat to 80°C for 2h. Add catalyst ethylenediamine, and continue stirring at 80°C for 1h.

[0064] Preparation Example 4

[0065] This preparation example prepares an oily polyurethane. The difference between its preparation raw materials and those in Preparation Example 1 is that the polyether 4110 is replaced by polyether N303 in equal parts, and other conditions remain unchanged.

[0066] Preparation Example 5

[0067] In this preparation example, an oily polyurethane is prepared. The difference between the raw materials and those in Preparation Example 1 is that the equal parts of polyether 4110 are replaced by a combination of polyether 4110 and polyether N303 in a mass ratio of 1:1, and other conditions remain unchanged.

[0068] Preparation Example 6

[0069] This preparation example prepares an oily polyurethane. The difference between its preparation raw materials and those in Preparation Example 1 is that equal parts of polyphenyl polymethylene polyisocyanate are replaced by diphenylmethane diisocyanate, and other conditions remain unchanged.

[0070] Example 1

[0071] The present embodiment provides an ionic rare earth ore fissure plugging material, which is composed of the following independent components in parts by weight: 8 parts of oily polyurethane (Preparation Example 1), 30 parts of dispersant (ethyl acetate), 100 parts of mineral additives (ionic rare earth ore fully weathered layer mineral soil), and 0.8 parts of water.

[0072] Example 2

[0073] This embodiment provides an ionic rare earth ore fissure plugging material, which is composed of the following independent components in parts by weight: 5 parts of oily polyurethane (Preparation Example 2), 20 parts of dispersant (ethyl acetate), 50 parts of mineral additives (ionic rare earth ore fully weathered layer mineral soil), and 0.5 parts of water.

[0074] Example 3

[0075] This embodiment provides an ionic rare earth ore fissure plugging material, which is composed of the following independent components in parts by weight: 10 parts of oily polyurethane (Preparation Example 3), 40 parts of dispersant (dichloromethane), 200 parts of mineral additives (ionic rare earth ore fully weathered layer mineral soil), and 1 part of water.

[0076] Example 4

[0077] This embodiment provides an ionic rare earth mineral fissure plugging material, the components of which differ from those of Example 1 only in that equal parts of the oily polyurethane in Preparation Example 1 are replaced with the oily polyurethane in Preparation Example 4, and other components and contents remain unchanged.

[0078] Example 5

[0079] This embodiment provides an ionic rare earth mineral fissure plugging material, the components of which differ from those of Example 1 only in that equal parts of the oily polyurethane in Preparation Example 1 are replaced with the oily polyurethane in Preparation Example 5, and other components and contents remain unchanged.

[0080] Example 6

[0081] This embodiment provides an ionic rare earth mineral fissure plugging material, the components of which differ from those of Example 1 only in that equal parts of the oily polyurethane in Preparation Example 1 are replaced with the oily polyurethane in Preparation Example 6, and other components and contents remain unchanged.

[0082] Example 7

[0083] This embodiment provides an ionic rare earth ore fissure plugging material, the components of which differ from those of Embodiment 1 only in that equal parts of ethyl acetate are replaced by acetone, and other components and contents remain unchanged.

[0084] Example 8

[0085] This embodiment provides an ionic rare earth ore fissure plugging material, the components of which differ from those of Example 1 only in that equal parts of ethyl acetate are replaced with a mixed dispersant of ethyl acetate and acetone in a volume ratio of 2:1, and other components and contents remain unchanged.

[0086] Comparative Example 1

[0087] This comparative example provides an ionic rare earth ore fissure plugging material, the components of which differ from those of Example 1 only in that equal parts of the mineral additives are replaced with fly ash, and other components and contents remain unchanged.

[0088] Comparative Example 2

[0089] This comparative example provides an ionic rare earth ore fissure plugging material, the components of which differ from those of Example 1 only in that equal parts of the mineral additives are replaced with quartz powder, and other components and contents remain unchanged.

[0090] Comparative Example 3

[0091] This comparative example provides an ionic rare earth mineral fissure plugging material, the components of which differ from those of Example 1 only in the lack of oily polyurethane and dispersant, and the other components and contents remain unchanged.

[0092] Test Example 1

[0093] An ionic rare earth mine simulation mine was built indoors. The bedrock floor was a piece of granite with a diameter of 7 cm and a height of 1 cm. There was a crack about 3 cm wide and 7 cm long in the center of the bedrock floor. The bedrock was covered with a fully weathered layer of mineral soil with a height of 2 cm and a density of 1.5 g cm -3 , simulating a barefoot mine.

[0094] The crack plugging materials of Examples 1-8 and Comparative Examples 1-3 were tested according to the following steps (Comparative Example 3 did not perform steps (1) and (2)):

[0095] (1) Stir the oily polyurethane and dispersant according to the ratio at 25°C for 2 minutes;

[0096] (2) mixing the mixture of step (1) and the mineral additive according to the proportion at 25° C. for 6 minutes;

[0097] (3) mixing the mixture of step (2) and water according to the proportions and stirring at 25° C. for 2 min;

[0098] (4) injecting the mixture from step (3) into the cracks of the ionic rare earth ore to perform foaming and plugging.

[0099] (5) Leaching experiment: The concentration of magnesium sulfate solution is 3wt.%, the injection speed is controlled at 6mL / min, the liquid collection time is 90min, and the total injection volume is 540mL. During the entire leaching process, the ore soil will absorb about 20mL.

[0100] The plugging effect of each group was evaluated, including the leakage at the crack, the effective liquid collection volume and the effective liquid collection rate at the periphery (effective liquid collection rate = effective liquid collection volume / effective liquid collection volume + leakage at the crack). The results are shown in Table 1:

[0101] Table 1

[0102]

[0103]

[0104] It can be seen from the data results in Table 1 that, compared with comparative examples 1-3, the plugging material involved in the present invention has excellent plugging effect on the bedrock fissures of ionic rare earth ores; by comparing Example 1 with Examples 2-8, it can be seen that the preparation raw materials of the oily polyurethane and the selection of the dispersant also affect the plugging effect of the plugging material on the bedrock fissures of ionic rare earth ores to a certain extent.

[0105] Test Example 2

[0106] An ionic rare earth mine simulation was built indoors. The mine had no bedrock floor and simulated a fully covered mine. The fully weathered layer of ore soil was 2 cm high and had a density of 1.5 g cm -3There is a broken zone about 1 cm wide and 3 cm long inside.

[0107] The crack plugging materials of Examples 1-3 and Comparative Example 3 were tested according to the following steps (Comparative Example 3 did not perform steps (1) and (2)):

[0108] (1) Stir the oily polyurethane and dispersant according to the ratio at 23°C for 2 minutes;

[0109] (2) mixing the mixture of step (1) and the mineral additive according to the proportion at 23° C. for 7 minutes;

[0110] (3) mixing the mixture of step (2) and water according to the proportions and stirring at 23° C. for 3 min;

[0111] (4) injecting the mixture from step (3) into the broken zone of the ionic rare earth ore to perform foaming and plugging.

[0112] (5) Leaching experiment: The concentration of magnesium sulfate solution was 3 wt.%, the injection rate was controlled at 3.5 mL / min, and the liquid collection time was 80 min.

[0113] The plugging effect of each group was evaluated, and the indicator was the leakage volume in the broken zone. The results are shown in Table 2:

[0114] Table 2

[0115] Group Loss at the broken zone (mL) Example 1 0 Example 2 0 Example 3 0 Comparative Example 3 270mL

[0116] It can be seen from the data results in Table 2 that, compared with the comparative example, the plugging material involved in the present invention has an excellent plugging effect on the weathering layer fracture zone of the ionic rare earth ore.

[0117] Test Example 3

[0118] A certain ionic rare earth mine, covering an area of ​​about 10 mu, has a penetrating crack about 6 cm wide and 50 m long in its bedrock floor.

[0119] The crack plugging materials of Examples 1-3 were tested according to the following steps (Comparative Example 3 did not perform steps (1) and (2)):

[0120] (1) Stir the oily polyurethane and dispersant according to the ratio at 26°C for 2 minutes;

[0121] (2) mixing the mixture of step (1) and the mineral additive according to the proportion at 26° C. for 5 minutes;

[0122] (3) mixing the mixture of step (2) and water according to the proportions and stirring at 26° C. for 3 min;

[0123] (4) injecting the mixture of step (3) into the cracks of the ionic rare earth ore through a borehole to perform foaming and plugging.

[0124] (5) In-situ mining process parameters: the concentration of magnesium sulfate in the leaching solution is 3wt.%, the average injection volume is 300m 3 / day, injection for 10 days.

[0125] At the same time, a control case (without adding any plugging agent) was set up. The in-situ mining process parameters were: the leaching solution was clean water (considering that a large amount of leaching solution would be lost, magnesium sulfate was not added to avoid environmental pollution), and the average injection volume was 300m 3 / day, injection for 10 days.

[0126] The plugging effect of each group was evaluated, and the indicators were the average liquid collection volume and the average liquid collection rate. The results are shown in Table 3:

[0127] Table 3

[0128] Group <![CDATA[Average liquid collection volume (m 3 / day)]]> Average liquid recovery rate (%) Example 1 <![CDATA[264m 3 / day]]> 88％ Example 2 <![CDATA[267m 3 / day]]> 89％ Example 3 <![CDATA[259m 3 / day]]> 86％ Comparative Example 3 <![CDATA[195m 3 / day]]> 65％

[0129] It can be seen from the data results in Table 3 that, compared with the comparative example, the plugging material involved in the present invention has an excellent plugging effect on the fracture zone of the ionic rare earth mine, can avoid the leakage of rare earth mother liquor, improve the resource recovery rate and reduce the pollution of the ecological environment around the mining area.

[0130] The applicant declares that the present invention illustrates the technical solution of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0131] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0132] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. An ionic rare earth mineral fissure plugging material, characterized in that: The fracture plugging material comprises the following independent components: oily polyurethane, dispersant, mineral additive and water.

2. The ionic rare earth mineral fissure plugging material according to claim 1, characterized in that: The fracture plugging material comprises the following independent components in parts by weight: 5-10 parts of oily polyurethane, 20-40 parts of dispersant, 50-250 parts of mineral additives and 0.2-2 parts of water.

3. The ionic rare earth mineral fissure plugging material according to claim 1 or 2, characterized in that: The raw materials for preparing the oily polyurethane include: isocyanate, polyether polyol and catalyst; Preferably, the isocyanate includes any one of diphenylmethane diisocyanate or polyphenyl polymethylene polyisocyanate or a combination of both.

4. The ionic rare earth mineral fissure plugging material according to claim 3, characterized in that: The polyether polyol includes any one of polyether 4110, polyether N303 or polypropylene glycol 400, or a combination of at least two of them; more preferably, a combination of polyether 4110 and polyether N303.

5. The ionic rare earth mineral fissure plugging material according to claim 3, characterized in that: The catalyst includes an amine catalyst, an organotin catalyst or an organobismuth catalyst.

6. The ionic rare earth mineral fissure plugging material according to any one of claims 1 to 5, characterized in that: The dispersant includes any one of dichloromethane, ethyl acetate or acetone or a combination of at least two thereof; more preferably, a combination of ethyl acetate and acetone.

7. The ionic rare earth mineral fissure plugging material according to any one of claims 1 to 6, characterized in that: The mineral additive is ionic rare earth ore with fully weathered layers.

8. The method for using the ionic rare earth mineral fissure plugging material according to any one of claims 1 to 7, characterized in that: The method of use comprises the following steps: (1) mixing the oily polyurethane with a dispersant to obtain a first mixture; (2) mixing the first mixture with a mineral additive to obtain a second mixture; (3) mixing the second mixture with water to obtain a third mixture; (4) Injecting the third mixture into the cracks of the ionic rare earth ore to perform foaming and plugging.

9. The method for using the ionic rare earth mineral fissure plugging material according to claim 8, characterized in that: The mixing in step (1) is carried out by stirring; Preferably, the mixing in step (1) is performed at 20-28° C. for 1-3 min; Preferably, the mixing in step (2) is carried out by stirring; Preferably, the mixing in step (2) is performed at 20-28° C. for 5-7 min; Preferably, the mixing in step (3) is carried out by stirring; Preferably, the mixing in step (3) is performed at 20-28°C for 2-3 min.

10. The ionic rare earth ore fissure plugging material according to any one of claims 1 to 7 is used to plug bedrock fissures and / or weathering layer fracture zones in ionic rare earth in-situ mining projects.

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