Liquid collecting method for concealed limestone area

Abstract

The invention discloses a liquid collecting method for a concealed limestone area, which comprises the following steps: firstly, constructing a liquid collecting roadway above an area which is easy to leak, and after the liquid collecting roadway is constructed, arranging a grouting pipe on a roadway bottom plate and injecting modified cement mortar; the modified cement mortar is prepared by mixing cement, leachate clarified waste residues, methyl methacrylate, fine aggregate, fly ash, latex powder, cellulose, starch ether, boric acid, a lubricant, phosphate betaine and the like. And meanwhile, a horizontal hole is constructed in the position 2.5-3.5 m below the liquid collecting roadway, and then modified cement mortar is injected into the horizontal hole for blocking. According to the characteristics of the hidden limestone region, an effective leakage repairing scheme is set, and the problems that leakage is much and leakage repairing is difficult in the in-situ leaching mining process of the rare earth ore in the hidden limestone region are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of ion-type rare earth ore mining, and in particular relates to a liquid collection method in a concealed limestone area. Background Art

[0002] The in-situ leaching process used in ionic rare earth ores is a green and efficient mining method that can effectively extract rare earth resources from the ore deposit, improve resource utilization, and reduce environmental pollution during ore mining and transportation. The main principle of the in-situ leaching process is to desorb rare earth ions from the minerals by injecting leaching agents, and then transport the rare earth-containing solution to the surface for treatment through the extraction system. In the in-situ leaching process, in order to prevent the leaching agent from penetrating into deeper hydrogeological layers, a good natural waterproof bottom plate or an artificial bottom plate is required at the bottom of the ore deposit. At the same time, an artificial bottom plate is also required in areas with high permeability or potential leakage risks. However, for hidden limestone areas, due to the development of karst, leakage problems emerge in an endless stream, and there are problems such as difficulty in leak repair and poor effect, which seriously affect the efficiency of liquid collection and greatly increase environmental protection risks. It is necessary to improve the existing liquid collection methods in a targeted manner, increase leak detection and repair measures, reduce leakage problems, reduce environmental protection risks, and increase the liquid collection rate of rare earth leaching solutions. Summary of the invention

[0003] In view of the above-mentioned deficiencies, the present invention discloses a liquid collection method for concealed limestone areas. According to the characteristics of concealed limestone areas, an effective leak detection and repair scheme is provided to solve the problems of frequent leakage and difficulty in repairing leakage in in-situ leaching mining of rare earth ores in concealed limestone areas.

[0004] The present invention is achieved by adopting the following technical solutions: A liquid collection method for a hidden limestone area comprises the following steps: S1. Construct a liquid collection tunnel above the area prone to leakage. After the construction of the liquid collection tunnel is completed, a grouting pipe is laid on the tunnel floor and modified cement mortar is injected; The preparation method of the modified cement mortar comprises the following steps: S11, weigh the following raw materials in parts by weight: 30-40 parts of cement, 10-15 parts of clarified waste residue from leachate, 3-5 parts of methyl methacrylate, 45-55 parts of fine aggregate, 5-8 parts of fly ash, 8-10 parts of latex powder, 2-3 parts of cellulose, 1-3 parts of starch ether, 0.02-0.05 parts of boric acid, 1-3 parts of lubricant, and 0.5-1 parts of phosphate betaine; S12, taking the clarified waste residue from the leachate, adding limestone to the mixture, grinding it through an 80-100 mesh sieve to obtain residue powder; taking cellulose, starch ether, and boric acid, stirring and mixing them at a temperature of 40-50° C. for 30-40 minutes, then adding latex powder, lubricant, and phosphate betaine, stirring evenly, and ultrasonically dispersing for 20-30 minutes to obtain a premix; S13, taking the slag powder and premix obtained in step S12, and mixing them with cement, methyl methacrylate, fine aggregate, fly ash and water to obtain a modified cement mortar, wherein the amount of water is 1 to 2 times the weight of the cement; S2. Construct a horizontal hole 2.5 to 3.5 meters below the liquid collection tunnel, and then inject the modified cement mortar described in step (1) into the horizontal hole for plugging.

[0005] Furthermore, in step S1, the depth of the grouting pipe arranged on the tunnel floor is 200 to 300 mm.

[0006] Furthermore, in step S1, the grouting pressure of the modified cement mortar injected through the grouting pipe is 3 to 5 MPa.

[0007] Furthermore, in step S11, the lubricant is any one or more combinations of xylitol, sodium stearate fumarate, magnesium stearate, and polyvinyl pyrrolidone; and the leachate clarified waste residue is the solid waste obtained after the leachate obtained by in-situ leaching is clarified, settled, and filtered.

[0008] Furthermore, in step S12, the weight ratio of limestone to leachate clarified waste residue is (0.5-2):10.

[0009] Furthermore, the stirring speed in step S12 is 100-200 r / min; and the stirring speed in step S13 is 30-60 r / min.

[0010] Furthermore, in step S2, the grouting pressure of the modified cement mortar injected into the horizontal hole is 2 to 3 MPa.

[0011] Compared with the prior art, this technical solution has the following beneficial effects: 1. The present invention is easy to operate. First, in the hidden limestone area, the seepage channel is found through seismic exploration, and then a liquid collection tunnel is set above the leakage channel, and the bottom plate of the liquid collection tunnel is grouting targetedly to form an artificial bottom plate. At the same time, the bottom of the liquid collection tunnel is reinforced by grouting with horizontal holes, so as to improve the rare earth mother liquor collection rate, reduce leakage, reduce environmental protection risks, and improve economic benefits.

[0012] 2. The present invention adopts modified cement mortar during grouting. By adding methyl methacrylate to cement, the porosity of cement-based materials can be reduced, thereby improving its impermeability and reducing the penetration of water and other harmful substances. Methyl methacrylate has good chemical corrosion resistance, which helps to increase the acid resistance of cement. Methyl methacrylate can also reduce the shrinkage of cement-based materials, thereby reducing the formation of cracks. At the same time, the waste residue clarified by the leachate is recycled and mixed with fine aggregates as fillers to make the mixed cement structure more compact, and can enhance the bonding force of concrete or mortar, improve its overall strength, and improve the impermeability, frost resistance, and crack resistance of cement. Grinding property, etc., and in order to reduce the adverse effects of acidic leachate clarified waste residue, limestone is added to the leachate clarified waste residue for mixed grinding, which can not only neutralize the acidity but also have a certain fineness of slag powder that can be graded with fine aggregate to fill the gaps between cement particles, make the mortar structure more compact, and can also adjust the hydration rate of cement; in addition, the present invention adds an additive prepared by a mixed reaction of latex powder, cellulose, starch ether and boric acid to improve the adhesion of cement mortar, and the adaptive addition of phosphate betaine and the cooperation with them can not only improve the flowability of cement mortar, but also optimize the microporous structure of mortar and improve the shrinkage performance of mortar. DETAILED DESCRIPTION

[0013] The present invention is further described by the following examples, but is not intended to be limiting of the present invention. Specific experimental conditions and methods not specified in the following examples are conventional methods commonly known to those skilled in the art.

[0014] Example 1: A liquid collection method for a hidden limestone area, comprising the following steps: S1. Use short-period micro-seismic detection equipment to delineate abnormal areas, find leakage channels and areas, then conduct drilling construction to verify abnormal areas, determine leakage channels and areas, and then construct liquid collection tunnels above areas prone to leakage. After the construction of the liquid collection tunnels is completed, grouting pipes are laid on the tunnel floor. The depth of the grouting pipes is 230 mm, and then modified cement mortar is injected. The grouting pressure is 4 MPa. The preparation method of the modified cement mortar comprises the following steps: S11, weigh the following raw materials in parts by weight: 35 parts of cement, 12 parts of clarified waste residue from leachate, 4 parts of methyl methacrylate, 50 parts of fine aggregate, 6 parts of fly ash, 9 parts of latex powder, 2.4 parts of cellulose, 1.5 parts of starch ether, 0.03 parts of boric acid, 1.5 parts of lubricant, and 0.6 parts of phosphate betaine; The lubricant is a combination of xylitol and polyvinyl pyrrolidone; the leaching solution clarified waste residue is a solid waste obtained by clarifying, settling and filtering the leaching solution obtained by in-situ leaching; S12, taking the clarified waste residue of the leachate, adding limestone, mixing and grinding through an 85-mesh sieve to obtain a slag powder, wherein the weight ratio of limestone to the clarified waste residue of the leachate is 0.8:10; taking cellulose, starch ether and boric acid, stirring and mixing at 45° C. and a speed of 150 r / min for 5 min, then adding latex powder, lubricant and phosphate betaine, stirring evenly and ultrasonically dispersing for 25 min to obtain a premix; S13, taking the slag powder and premix obtained in step S12, and mixing them with cement, methyl methacrylate, fine aggregate, fly ash and water at a speed of 40 r / min to obtain a modified cement mortar, wherein the amount of water is 1.8 times the weight of cement; S2. Construct a horizontal hole at 3.0 m below the liquid collection tunnel, and then inject the modified cement mortar described in step (1) into the horizontal hole for plugging. The injection pressure of the modified cement mortar into the horizontal hole is 2.5 MPa.

[0015] Taking the original area without grouting of the bottom plate of the roadway and the grouting reinforcement under the roadway as a control, the construction according to the method of this embodiment can increase the liquid collection rate from the original 20% to 91%.

[0016] Example 2: A liquid collection method for a hidden limestone area, comprising the following steps: S1. Use short-period micro-seismic detection equipment to delineate abnormal areas, find leakage channels and areas, and then conduct drilling construction to verify abnormal areas and determine leakage channels and areas. Then, construct a liquid collection tunnel above the area prone to leakage. After the construction of the liquid collection tunnel is completed, a grouting pipe is laid on the tunnel floor. The depth of the grouting pipe is 200 mm, and then modified cement mortar is injected. The grouting pressure is 3MPa. The preparation method of the modified cement mortar comprises the following steps: S11, weigh the following raw materials in parts by weight: 30 parts of cement, 10 parts of clarified waste residue from leachate, 3 parts of methyl methacrylate, 45 parts of fine aggregate, 5 parts of fly ash, 8 parts of latex powder, 2 parts of cellulose, 1 part of starch ether, 0.02 parts of boric acid, 1 part of lubricant, and 0.5 parts of phosphate betaine; The lubricant is magnesium stearate; the leaching solution clarified waste residue is a solid waste obtained by clarifying, settling and filtering the leaching solution obtained by in-situ leaching; S12, taking the clarified waste residue of the leachate, adding limestone to the mixture, grinding it through an 80-mesh sieve to obtain a slag powder, wherein the weight ratio of limestone to the clarified waste residue of the leachate is 0.5:10; taking cellulose, starch ether and boric acid, stirring and mixing them at 40° C. and a speed of 100 r / min for 40 min, then adding latex powder, lubricant and phosphate betaine, stirring evenly and ultrasonically dispersing for 30 min to obtain a premix; S13, taking the slag powder and premix obtained in step S12, and mixing them with cement, methyl methacrylate, fine aggregate, fly ash and water at a speed of 30 r / min to obtain a modified cement mortar, wherein the amount of water is 1 times the weight of cement; S2. Construct a horizontal hole 2.5 meters below the liquid collection tunnel, and then inject the modified cement mortar described in step (1) into the horizontal hole for plugging. The injection pressure of the modified cement mortar into the horizontal hole is 2 MPa.

[0017] Taking the original area without grouting of the bottom plate of the roadway and the grouting reinforcement under the roadway as a control, the construction according to the method of this embodiment can increase the liquid collection rate from the original 20% to 88%.

[0018] Example 3: A liquid collection method for a hidden limestone area, comprising the following steps: S1. Use short-period micro-seismic detection equipment to delineate abnormal areas, find leakage channels and areas, and then conduct drilling construction to verify abnormal areas and determine leakage channels and areas. Then, construct a liquid collection tunnel above the area prone to leakage. After the construction of the liquid collection tunnel is completed, a grouting pipe is laid on the tunnel floor. The depth of the grouting pipe is 280 mm, and then modified cement mortar is injected. The grouting pressure is 4.5 MPa. The preparation method of the modified cement mortar comprises the following steps: S11, weigh the following raw materials in parts by weight: 38 parts of cement, 14 parts of clarified waste residue from leachate, 4 parts of methyl methacrylate, 52 parts of fine aggregate, 7 parts of fly ash, 8.5 parts of latex powder, 2.5 parts of cellulose, 2.5 parts of starch ether, 0.04 parts of boric acid, 2.2 parts of lubricant, and 0.8 parts of phosphate betaine; The lubricant is polyvinyl pyrrolidone; the leaching solution clarified waste residue is the solid waste obtained after the leaching solution obtained by in-situ leaching is clarified, settled and filtered; S12, taking the clarified waste residue of the leachate, adding limestone to the mixture, grinding it through a 90-mesh sieve to obtain a slag powder, wherein the weight ratio of limestone to the clarified waste residue of the leachate is 1.6:10; taking cellulose, starch ether, and boric acid, stirring and mixing them at 48° C. and a speed of 180 r / min for 35 min, then adding latex powder, lubricant, and phosphate betaine, stirring evenly, and ultrasonically dispersing for 25 min to obtain a premix; S13, taking the slag powder and premix obtained in step S12, and mixing them with cement, methyl methacrylate, fine aggregate, fly ash and water at a speed of 50 r / min to obtain a modified cement mortar, wherein the amount of water is 1.8 times the weight of cement; S2. Construct a horizontal hole at 3.0 m below the liquid collection tunnel, and then inject the modified cement mortar described in step (1) into the horizontal hole for plugging. The injection pressure of the modified cement mortar into the horizontal hole is 2.5 MPa.

[0019] Taking the original area without grouting of the bottom plate of the roadway and the grouting reinforcement under the roadway as a control, the construction according to the method of this embodiment can increase the liquid collection rate from the original 20% to 90%.

[0020] Example 4: A liquid collection method for a hidden limestone area, comprising the following steps: S1. Use short-period micro-seismic detection equipment to delineate abnormal areas, find leakage channels and areas, and then conduct drilling construction to verify abnormal areas and determine leakage channels and areas. Then, construct a liquid collection tunnel above the area prone to leakage. After the construction of the liquid collection tunnel is completed, a grouting pipe is laid on the tunnel floor. The depth of the grouting pipe is 300 mm, and then modified cement mortar is injected. The grouting pressure is 5MPa. The preparation method of the modified cement mortar comprises the following steps: S11, weigh the following raw materials in parts by weight: 40 parts of cement, 15 parts of clarified waste residue from leachate, 5 parts of methyl methacrylate, 55 parts of fine aggregate, 8 parts of fly ash, 10 parts of latex powder, 3 parts of cellulose, 3 parts of starch ether, 0.05 parts of boric acid, 3 parts of lubricant, and 1 part of phosphate betaine; The lubricant is xylitol; the leaching solution clarified waste residue is a solid waste obtained by clarifying, settling and filtering the leaching solution obtained by in-situ leaching; S12, taking the clarified waste residue of the leachate, adding limestone to the mixture, grinding it through a 100-mesh sieve to obtain a residue powder, wherein the weight ratio of the limestone to the clarified waste residue of the leachate is 2:10; taking cellulose, starch ether, and boric acid, stirring and mixing them at 50° C. and a speed of 200 r / min for 30 min, then adding latex powder, lubricant, and phosphate betaine, stirring evenly, and ultrasonically dispersing for 20 min to obtain a premix; S13, taking the slag powder and premix obtained in step S12, and mixing them with cement, methyl methacrylate, fine aggregate, fly ash and water at a speed of 60 r / min to obtain a modified cement mortar, wherein the amount of water is twice the weight of cement; S2. Construct a horizontal hole 3.5 meters below the liquid collection tunnel, and then inject the modified cement mortar described in step (1) into the horizontal hole for plugging. The injection pressure of the modified cement mortar into the horizontal hole is 3 MPa.

[0021] Taking the original area without grouting of the bottom plate of the roadway and the grouting reinforcement under the roadway as a control, the construction according to the method of this embodiment can increase the liquid collection rate from the original 20% to 92%.

[0022] Comparative Example 1: The liquid collection method for concealed limestone areas described in this comparative example is different from the liquid collection method described in Example 1 only in that step S2 is omitted and grouting reinforcement is not performed below the liquid collection tunnel.

[0023] Taking the original area without grouting of the bottom plate of the roadway and the grouting reinforcement under the roadway as a control, the construction according to this comparative method can increase the liquid collection rate from the original 20% to 69%.

[0024] Comparative Example 2: The liquid collection method for hidden limestone areas described in this comparative example is different from the liquid collection method described in Example 1 only in that conventional silicate cement is used instead of the modified cement mortar in step S1 and step S2.

[0025] Taking the original area without grouting of the bottom plate of the roadway and the grouting reinforcement under the roadway as a control, the construction according to this comparative method can increase the liquid collection rate from the original 20% to 82%.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A liquid collection method for concealed limestone areas, characterized in that: The following steps are involved: S1. Construct a liquid collection tunnel above the area prone to leakage. After the construction of the liquid collection tunnel is completed, a grouting pipe is laid on the tunnel floor and modified cement mortar is injected; The preparation method of the modified cement mortar comprises the following steps: S11, weigh the following raw materials in parts by weight: 30-40 parts of cement, 10-15 parts of clarified waste residue from leachate, 3-5 parts of methyl methacrylate, 45-55 parts of fine aggregate, 5-8 parts of fly ash, 8-10 parts of latex powder, 2-3 parts of cellulose, 1-3 parts of starch ether, 0.02-0.05 parts of boric acid, 1-3 parts of lubricant, and 0.5-1 parts of phosphate betaine; S12, taking the clarified waste residue from the leachate, adding limestone to the mixture, grinding it through an 80-100 mesh sieve to obtain residue powder; taking cellulose, starch ether, and boric acid, stirring and mixing them at a temperature of 40-50° C. for 30-40 minutes, then adding latex powder, lubricant, and phosphate betaine, stirring evenly, and ultrasonically dispersing for 20-30 minutes to obtain a premix; S13, taking the slag powder and premix obtained in step S12, and mixing them with cement, methyl methacrylate, fine aggregate, fly ash and water to obtain a modified cement mortar, wherein the amount of water is 1 to 2 times the weight of the cement; S2. Construct a horizontal hole 2.5 to 3.5 meters below the liquid collection tunnel, and then inject the modified cement mortar described in step (1) into the horizontal hole for plugging.

2. The liquid collection method for hidden limestone areas according to claim 1, characterized in that: In step S1, the depth of the grouting pipe arranged on the tunnel floor is 200 to 300 mm.

3. The liquid collection method for hidden limestone areas according to claim 1, characterized in that: In step S1, the grouting pressure of the modified cement mortar injected through the grouting pipe is 3 to 5 MPa.

4. The liquid collection method for hidden limestone areas according to claim 1, characterized in that: In step S11, the lubricant is any one or more combinations of xylitol, sodium stearate fumarate, magnesium stearate, and polyvinyl pyrrolidone; and the leachate clarified waste residue is solid waste obtained after clarifying, settling, and filtering the leachate obtained by in-situ leaching.

5. The liquid collection method for hidden limestone areas according to claim 1, characterized in that: In step S12, the weight ratio of limestone to leaching solution clarified waste residue is (0.5-2):

10.

6. The liquid collection method for hidden limestone areas according to claim 1, characterized in that: The stirring speed in step S12 is 100-200 r / min; the stirring speed in step S13 is 30-60 r / min.

7. The liquid collection method for hidden limestone areas according to claim 1, characterized in that: In step S2, the grouting pressure of the modified cement mortar injected into the horizontal hole is 2-3 MPa.