A method for recovering tailings from coarse-particle fluidized bed flotation of molybdenum ore

Abstract

This invention relates to a method for recovering coarse-grained fluidized bed flotation tailings from molybdenum ore, belonging to the field of molybdenum tailings recovery technology. It addresses at least one of the following problems: existing methods cannot fully utilize coarse-grained tailings in building materials and solve the problem of stockpiling; existing methods require natural sand and gravel aggregates in the tailings-to-building process; comprehensive utilization is difficult; and tailings maintenance costs are high. The method of this invention uses coarse-grained tailings as the main raw material. By classifying tailings of different particle sizes, it coordinates with slag, fly ash, and other solid wastes to prepare high-strength concrete. This not only achieves full-scale comprehensive utilization of coarse-grained tailings but also promotes the high-efficiency utilization of other solid wastes, avoids the use of natural sand and gravel aggregates, and reduces tailings maintenance costs. It is of great significance for improving resource utilization efficiency and the sustainable development of the mining industry.

Description

Technical Field

[0001] This invention relates to the field of molybdenum tailings recovery technology, and in particular to a method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore. Background Technology

[0002] Molybdenum ore has a low molybdenum grade, but high enrichment ratios in beneficiation processes, resulting in a large tailings output, with a molybdenum tailings yield as high as 99%. With the increasing global demand for molybdenum metal, the amount of molybdenum ore tailings has also increased dramatically. The large-scale accumulation of molybdenum tailings in tailings ponds not only wastes resources and poses significant ecological and environmental safety hazards, but also increases the maintenance costs of tailings ponds for enterprises, reducing their economic benefits.

[0003] Coarse-particle fluidized bed flotation technology for molybdenum ore is a novel pre-separation flotation tailings removal technology (Chinese Patent CN110882852A). Molybdenum ore with a particle size of 0.15-1.0 mm is slurry-conditioned and then introduced into coarse-particle fluidized bed flotation equipment. After separation, approximately 35% tailings are discharged, while 65% of the concentrate is transferred to a mill for grinding before being fed into the existing flotation process at the concentrator. This technology can reduce the cost of downstream grinding and flotation operations and the discharge of fine-particle tailings, increase the economic benefits of enterprises, and extend the service life of tailings ponds.

[0004] Existing patents only address the comprehensive recovery, building material application, and high-value utilization of fine-particle tailings smaller than 150μm. Currently, there are few patents and literature reports on the comprehensive utilization of coarse-particle fluidized bed flotation tailings from molybdenum ore. The high-efficiency utilization of coarse-particle fluidized bed flotation tailings from molybdenum ore remains insufficient.

[0005] This invention enables the comprehensive utilization of coarse-grained fluidized bed flotation tailings of molybdenum ore through classification and quality separation. It not only improves resource utilization efficiency, achieving maximum reduction and resource recovery, but also realizes the high-value utilization of tailings. Summary of the Invention

[0006] Based on the above analysis, the present invention aims to provide a method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore, in order to solve at least one of the following problems: existing methods cannot fully utilize coarse-particle tailings for building materials and solve the problem of stockpiling; existing methods require natural sand and gravel aggregates for tailings building materials; comprehensive utilization is difficult; and tailings maintenance costs are high.

[0007] In a first aspect, the present invention provides a method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore, comprising the following steps:

[0008] (1) The coarse-particle fluidized flotation tailings of the molybdenum ore were subjected to multi-stage screening using three types of sieves: 500μm, 250μm, and 150μm. The product over the 500μm sieve was denoted as component A, the product over the 250μm sieve was denoted as component B, the product over the 150μm sieve was denoted as component C, and the product under the 150μm sieve was denoted as component D.

[0009] (2) The component D is ball-milled for the first time to make a gelling material from the ball-milled component D.

[0010] (3) Mix the cementitious material in step (2) with components A, B and C in step (1), add foaming agent, let stand, and hydraulically mold to obtain precast concrete;

[0011] (4) Curing the precast concrete described in step (3) yields high-strength concrete.

[0012] Furthermore, in step (2), the first ball milling time is 2.5-5.0h.

[0013] Furthermore, in step (2), the ball-milled component D, fly ash, slag, gypsum, activator and water-reducing agent are mixed and then ball-milled a second time to obtain the cementitious material.

[0014] Furthermore, the mass ratio of ball-milled component D, fly ash, slag, gypsum, and activator is 25-50:15-25:5-15:15-25:1.5-6.0, and the mass fraction of water-reducing agent in cementitious material is 0.3-1.8% of the total mass of component D, fly ash, slag, gypsum, and activator.

[0015] Furthermore, in step (3), the mass ratio of the cementitious material, component A, component B and component C is 35-50: 5-15: 10-25: 15-30.

[0016] Furthermore, in step (3), the foaming agent accounts for 1.0-2.5% of the total mass of the cementitious material, component A, component B and component C.

[0017] Furthermore, in step (3), the settling time is 4.5-6.5h.

[0018] Furthermore, in step (4), the curing includes first transferring the precast concrete to a cement rapid curing box for the first curing, demolding, and then transferring the demolded precast concrete to an autoclave for autoclaving to obtain high-strength concrete.

[0019] Furthermore, the relative humidity for the first curing is 94-98%, the curing temperature is 15-25℃, and the oxidation time is 18-30 hours.

[0020] Secondly, the present invention provides concrete prepared using the above-described method.

[0021] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0022] The method of this invention uses coarse-grained tailings as the main raw material. By classifying and processing tailings of different particle sizes, it can be used in conjunction with slag, fly ash and other solid wastes to prepare high-strength concrete. This not only realizes the comprehensive utilization of coarse-grained tailings, but also promotes the high-efficiency utilization of other solid wastes, avoids the use of natural sand and gravel aggregates, and reduces the cost of tailings maintenance. It is of great significance for improving the efficiency of comprehensive resource utilization and the sustainable development of the mining industry.

[0023] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0024] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0025] Figure 1 This is a process flow diagram of a method for recovering tailings from coarse-particle fluidized bed flotation of molybdenum ore. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0027] A specific embodiment of the present invention, such as Figure 1 As shown, a method for recovering tailings from coarse-particle fluidized bed flotation of molybdenum ore is disclosed, comprising the following steps:

[0028] (1) The coarse-particle fluidized flotation tailings of the molybdenum ore were subjected to multi-stage screening using three types of sieves: 500μm, 250μm, and 150μm. The product over the 500μm sieve was denoted as component A, the product over the 250μm sieve was denoted as component B, the product over the 150μm sieve was denoted as component C, and the product under the 150μm sieve was denoted as component D.

[0029] (2) The component D is ball-milled for the first time to make a gelling material from the ball-milled component D.

[0030] (3) Mix the cementitious material in step (2) with components A, B and C in step (1), add foaming agent, let stand, and hydraulically mold to obtain precast concrete;

[0031] (4) Curing the precast concrete described in step (3) yields high-strength concrete.

[0032] Compared with existing technologies, the method of the present invention uses coarse-particle tailings as the main raw material. By classifying and processing tailings of different particle sizes, and coordinating with solid wastes such as slag and fly ash to prepare high-strength concrete, it not only realizes the full-scale comprehensive utilization of coarse-particle tailings, but also promotes the high-efficiency utilization of other solid wastes and avoids the use of natural sand and gravel aggregates. It is of great significance for improving the efficiency of comprehensive resource utilization and the sustainable development of the mining industry.

[0033] It should be noted that the particle size of coarse-grained fluidized bed flotation tailings from molybdenum ore is generally between 0.15 and 1.00 mm, which is much larger than that of existing fine-grained tailings (which are usually less than 0.15 mm). The coarse-grained tailings mainly contain minerals such as quartz, feldspar, mica, and chlorite, with the main chemical composition being SiO2, Al2O3, CaO, MgO, Fe2O3, Na2O (1.46 t%), and K2O, among which the loss on ignition is approximately 2.45 wt%.

[0034] Specifically, in step (2), the first ball milling time is 2.5-5.0h, for example, 2.5h, 2.7h, 2.9h, 3.1h, 3.3h, 3.5h, 3.7h, 3.9h, 4.1h, 4.3h, 4.5h, 4.7h, 4.9h, 5.0h.

[0035] Specifically, in step (2), the ball-milled component D, fly ash, slag, gypsum, activator and water-reducing agent are mixed and then ball-milled a second time to obtain the cementitious material.

[0036] Specifically, the second ball milling time is 40-240 minutes, for example, 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes, 90 minutes, 100 minutes, 110 minutes, 120 minutes, 130 minutes, 140 minutes, 150 minutes, 160 minutes, 170 minutes, 180 minutes, 190 minutes, 200 minutes, 210 minutes, 220 minutes, 230 minutes, and 240 minutes.

[0037] Preferably, the mass ratio of the ball-milled component D, fly ash, slag, gypsum, and activator is 25-50 (e.g., 25, 30, 35, 40, 45, 50): 15-25 (e.g., 15, 20, 25): 5-15 (e.g., 5, 7, 9, 10, 12, 14, 15): 15-25 (e.g., 5, 7, 9, 10, 12, 14, 15): 1.5-6.0 (e.g., 1.5, 2.0, 2.5). 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6), the mass fraction of the water-reducing agent in the cementitious material is 0.3% to 1.8% of the total mass of component D, fly ash, slag, gypsum and activator, for example, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%.

[0038] It should be noted that the proportions of component D, fly ash, slag, gypsum, and activator after ball milling were obtained through extensive testing. Tailings powder has low hydration activity and primarily functions as a diluent and filler in concrete. If the proportion of component D is too high, the mechanical and durability properties of the cementitious material will decrease; if the proportion of component D is too low, large-scale use of tailings cannot be achieved. Exceeding this range in the dosage of water-reducing agent will lead to excessive concrete slump, excessive retarding effect, and brittleness.

[0039] Preferably, the slag is S95 grade slag;

[0040] The gypsum is phosphogypsum or desulfurized gypsum, with a calcium sulfate dihydrate content greater than 85%;

[0041] The activator is cement clinker;

[0042] The water-reducing agent is a polycarboxylate-based water-reducing agent or a naphthalene-based water-reducing agent.

[0043] Specifically, in step (3), the mass ratio of cementitious material, component A, component B and component C is 35-50 (e.g., 35, 40, 45, 50): 5-15 (e.g., 5, 7, 9, 10, 12, 14, 15): 10-25 (e.g., 10, 12, 16, 18, 20, 22, 24, 25): 15-30.

[0044] It should be noted that internal pores and cracks in concrete are a significant cause of reduced mechanical and durability properties. Therefore, the particle size distribution of concrete is crucial. A suitable particle size distribution can effectively reduce micropores within the concrete matrix, increase matrix density, improve pore structure, and thus enhance various concrete properties. Conversely, if the proportion is too high, it will reduce the compressive strength of the concrete; if the proportion is too low, it will reduce the use of fine-grained tailings and, more importantly, increase the internal porosity of the concrete, further reducing compressive strength.

[0045] This invention utilizes components A, B, and C, obtained from the cascade screening of coarse-grained fluidized bed flotation tailings, as coarse sand, medium sand, and fine sand, respectively. These components can be added in specific proportions according to concrete performance requirements, facilitating the control of concrete properties. This invention also utilizes component D as fine-grained tailings, which is ball-milled together with other solid wastes to prepare cementitious materials. This reduces ball milling energy consumption and enhances the activity of the cementitious materials. Furthermore, components A, B, and C in this invention represent coarse sand, medium sand, and fine sand, respectively. This portion of the product has high value; it can not only be used with fine-grained tailings to prepare high-strength concrete but can also be sold separately for use as construction sand.

[0046] Specifically, in step (3), the foaming agent is aluminum powder; preferably, the foaming agent accounts for 1.0-2.5% of the total mass of the cementitious material, component A, component B and component C, for example, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2.0%, 2.2%, 2.4% and 2.5%.

[0047] It should be noted that the amount of foaming agent used directly affects the quality and performance of concrete. Excessive foaming agent will reduce the strength and density of the concrete; insufficient foaming agent will increase the concrete density, but reduce its thermal insulation, heat insulation, and sound insulation effects.

[0048] Specifically, in step (3), the settling time is 4.5-6.5h, for example, 4.5h, 4.7h, 4.9h, 5.1h, 5.2h, 5.4h, 5.6h, 5.8h, 6.0h, 6.2h, 6.4h, 6.5h.

[0049] Specifically, in step (4), the curing includes first transferring the precast concrete to a cement rapid curing box for the first curing, demolding after a period of curing, and then transferring the demolded precast concrete to an autoclave for autoclaving to obtain high-strength concrete.

[0050] Preferably, the relative humidity for the first curing is 94-98%, for example, 94%, 95%, 96%, 97%, or 98%; the curing temperature is 15-25℃, for example, 15℃, 17℃, 19℃, 21℃, 23℃, or 25℃; and the oxidation time is 18-30 hours, for example, 18 hours, 20 hours, 22 hours, 24 hours, 26 hours, 28 hours, or 30 hours.

[0051] Preferably, the autoclaving process includes vacuuming for 15-20 minutes, for example, 15 minutes, 16 minutes, 17 minutes, 18 minutes, 19 minutes, or 20 minutes, at a pressure of 0.25-0.35 MPa, for example, 0.25 MPa, 0.26 MPa, 0.27 MPa, 0.28 MPa, 0.29 MPa, 0.30 MPa, 0.31 MPa, 0.32 MPa, 0.33 MPa, 0.34 MPa, or 0.35 MPa, and a pressure stabilization time of 1.0-2.5 hours, for example, 1.0 hour, 1.2 hours, 1.4 hours, 1.6 hours, 1.8 hours, 2.0 hours, 2.2 hours, 2.4 hours, or 2.5 hours.

[0052] More preferably, after steam is introduced into the autoclave, the pressure is increased by 1.0-1.5 MPa within 1.5-2.5 hours (e.g., 1.5h, 1.6h, 1.7h, 1.8h, 1.9h, 2.0h, 2.1h, 2.2h, 2.3h, 2.4h, 2.5h), for example, 1.0MPa, 1.1MPa, 1.2MPa, 1.3MPa, 1.4MPa, 1.5MPa, and the pressure is stabilized for 1.5-3.5 hours (e.g., 1.5h, 1.7h, 1.9h, 2.1h, 2.3h, 2.5h, 2.7h, 2.9h, 3.1h, 3.3h, 3.5h).

[0053] More preferably, the pressure in the autoclave is increased to 2.0-2.5 MPa (e.g., 2.0 MPa, 2.1 MPa, 2.2 MPa, 2.3 MPa, 2.4 MPa, 2.5 MPa) within 2.5-3.5 hours (e.g., 2.5 hours, 2.7 hours, 2.9 hours, 3.1 hours, 3.3 hours, 3.5 hours, 3.4 hours, 4.0 hours, 6.0 hours, for example, 4.0 hours, 4.2 hours, 4.4 hours, 4.6 hours, 4.8 hours, 5.0 hours, 5.2 hours, 5.4 hours, 5.6 hours, 5.8 hours, 6.0 hours).

[0054] Furthermore, high-strength concrete is obtained by depressurizing the autoclave to 0 MPa for 1.5-2.0 h (e.g., 1.5 h, 1.6 h, 1.7 h, 1.8 h, 1.9 h, 2.0 h).

[0055] The concrete described in this invention has a 7-day compressive strength of 46.4–47.6 MPa, a 28-day compressive strength of 48.2–50.1 MPa, and a 60-day compressive strength of 51.7–53.6 MPa.

[0056] The technical solution of the present invention will be further explained below with reference to specific embodiments.

[0057] It should be noted that the coarse-particle fluidized bed flotation tailings of molybdenum ore used in the following examples are tailings produced by pre-separation using coarse-particle fluidized bed flotation equipment in a molybdenum mine in Henan Province. The tailings have a particle size of 0.15-1.0 mm and mainly contain minerals such as quartz, feldspar, mica, and chlorite. The main chemical composition is SiO2 (72.36 wt%), Al2O3 (11.35 wt%), CaO (2.31 wt%), MgO (1.45 wt%), Fe2O3 (2.47 wt%), Na2O (1.46 wt%), and K2O (3.25 wt%), with a loss on ignition of 2.45 wt%.

[0058] Example 1

[0059] This embodiment of a method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore includes the following steps:

[0060] (1) The coarse-particle fluidized flotation tailings of the molybdenum ore were subjected to multi-stage screening using three types of sieves: 500μm, 250μm, and 150μm. The product over the 500μm sieve was denoted as component A, the product over the 250μm sieve was denoted as component B, the product over the 150μm sieve was denoted as component C, and the product under the 150μm sieve was denoted as component D.

[0061] (2) The component D is ball-milled for 2.5 hours. The ball-milled component D, fly ash, slag, gypsum and activator are mixed in a mass ratio of 35:25:15:20:5 to obtain component E. The polycarboxylate superplasticizer is 0.5% of the mass of component E. The mixture is then ball-milled for 2.5 hours to obtain the cementitious material.

[0062] (3) Mix the cementitious material in step (2) with components A, B and C in step (1) in a mass ratio of 35:15:20:30, add aluminum powder foaming agent, the foaming agent accounts for 1.0% of the total mass of cementitious material, component A, component B and component C, let stand for 5.0h, and perform hydraulic molding to obtain precast concrete.

[0063] (4) The precast concrete described in step (3) is transferred to a cement rapid curing box for curing. The relative humidity for curing is 94%, the curing temperature is 15℃, and the curing time is 20h. After curing, the precast concrete is demolded and transferred to an autoclave for autoclaving. The autoclave is vacuumed for 15min, the pressure is 0.25MPa, and the pressure stabilization time is 1.0h. After the autoclave is filled with steam, the pressure is increased to 1.0MPa within 1.5h and the pressure stabilization time is 2.0h. Then, the pressure in the autoclave is increased to 2.0MPa within 2.5h and the pressure stabilization time is 4.0h. Finally, the autoclave is depressurized and the pressure is reduced to 0MPa within 1.5h to obtain high-strength concrete.

[0064] Example 2

[0065] This embodiment of a method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore includes the following steps:

[0066] (1) The coarse-particle fluidized flotation tailings of the molybdenum ore were subjected to multi-stage screening using three types of sieves: 500μm, 250μm, and 150μm. The product over the 500μm sieve was denoted as component A, the product over the 250μm sieve was denoted as component B, the product over the 150μm sieve was denoted as component C, and the product under the 150μm sieve was denoted as component D.

[0067] (2) The component D is ball-milled for the first time for 3.5 hours. The ball-milled component D, fly ash, slag, gypsum and activator are mixed in a mass ratio of 45:20:10:22:3 to obtain component E. The polycarboxylate superplasticizer is 0.9% of the mass of component E. The mixture is then ball-milled for 4.0 hours to obtain the cementitious material.

[0068] (3) Mix the cementitious material in step (2) with components A, B and C in step (1) in a mass ratio of 50:10:20:20, add aluminum powder foaming agent, the foaming agent accounts for 2.0% of the total mass of cementitious material, component A, component B and component C, let stand for 5.5 hours, and perform hydraulic molding to obtain precast concrete.

[0069] (4) The precast concrete described in step (3) is transferred to a cement rapid curing box for curing. The relative humidity is 99%, the curing temperature is 20℃, and the curing time is 24h. After curing, the precast concrete is demolded and transferred to an autoclave for autoclaving. The autoclave is vacuumed for 20min, the pressure is 0.30MPa, and the pressure stabilization time is 2.0h. After the autoclave is filled with steam, the pressure is increased to 1.5MPa within 1.5h and the pressure stabilization time is 2.5h. Then, the pressure in the autoclave is increased to 2.5MPa within 3.0h and the pressure stabilization time is 5.0h. Finally, the autoclave is depressurized and the pressure is reduced to 0MPa in 2.0h to obtain high-strength concrete.

[0070] Example 3

[0071] This embodiment of a method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore includes the following steps:

[0072] (1) The coarse-particle fluidized flotation tailings of the molybdenum ore were subjected to multi-stage screening using three types of sieves: 500μm, 250μm, and 150μm. The product over the 500μm sieve was denoted as component A, the product over the 250μm sieve was denoted as component B, the product over the 150μm sieve was denoted as component C, and the product under the 150μm sieve was denoted as component D.

[0073] (2) The component D is ball-milled for 2.5 hours. The ball-milled component D, fly ash, slag, gypsum and activator are mixed in a mass ratio of 50:19:10:18:3 to obtain component E. The polycarboxylate superplasticizer is 1.5% of the mass of component E. The mixture is then ball-milled for 4.5 hours to obtain the cementitious material.

[0074] (3) Mix the cementitious material in step (2) with components A, B and C in step (1) in a mass ratio of 45:15:10:30, add aluminum powder foaming agent, the foaming agent accounts for 2.5% of the total mass of cementitious material, component A, component B and component C, let stand for 6.0h, and perform hydraulic molding to obtain precast concrete.

[0075] (4) The precast concrete described in step (3) is transferred to a cement rapid curing box for curing. The relative humidity for curing is 98%, the curing temperature is 25℃, and the curing time is 30h. After curing, the precast concrete is demolded and transferred to an autoclave for autoclaving. The autoclave is vacuumed for 15min, the pressure is 0.35MPa, and the pressure stabilization time is 3.5h. After the autoclave is filled with steam, the pressure is increased to 1.5MPa within 2.5h and the pressure stabilization time is 3h. Then, the pressure in the autoclave is increased to 2.5MPa within 3.5h and the pressure stabilization time is 6h. Finally, the autoclave is depressurized and the pressure is reduced to 0MPa in 2.0h to obtain high-strength concrete.

[0076] Comparative Example 1

[0077] The method for recovering coarse-particle fluidized flotation tailings of molybdenum ore in this comparative example is the same as that in Example 1, except that in step (3), component A is not added, and the cementitious material, component B and component C are mixed and stirred in a mass ratio of 50:20:30.

[0078] Comparative Example 2

[0079] The method for recovering coarse-particle fluidized flotation tailings of molybdenum ore in this comparative example is the same as that in Example 1, except that in step (3), component B is not added, and the cementitious material, component A and component C are mixed and stirred in a mass ratio of 55:15:30.

[0080] Comparative Example 3

[0081] The method for recovering coarse-particle fluidized flotation tailings of molybdenum ore in this comparative example is the same as that in Example 1, except that in step (3), component C is not added, and the cementitious material, component A and component B are mixed and stirred in a mass ratio of 65:15:20.

[0082] Comparative Example 4

[0083] The method for recovering coarse-particle fluidized flotation tailings of molybdenum ore in this comparative example is the same as that in Example 1, except that in step (2), the mass ratio of the ball-milled component D, fly ash, slag, gypsum and activator is 55:15:10:15:5.

[0084] Comparative Example 5

[0085] The method for recovering coarse-particle fluidized flotation tailings of molybdenum ore in this comparative example is the same as that in Example 1, except that in step (3), the mass ratio of cementitious material, component A, component B and component C is 30:20:30:20.

[0086] Experimental Example 1

[0087] The compressive strength and setting time of the concrete prepared in Examples 1-3 and Comparative Examples 1-8 were tested respectively, and the results are shown in Table 1.

[0088] Table 1

[0089] Group 7-day compressive strength (MPa) 28-day compressive strength (MPa) 60-day compressive strength (MPa) Example 1 46.4 48.2 51.7 Example 2 47.6 49.4 52.9 Example 3 46.9 50.1 53.6 Comparative Example 1 41.7 43.9 47.0 Comparative Example 2 43.4 45.2 48.3 Comparative Example 3 42.6 44.8 47.1 Comparative Example 4 41.2 44.7 46.8 Comparative Example 5 43.9 45.7 47.6

[0090] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for recovering tailings from coarse-particle fluidized bed flotation of molybdenum ore, characterized in that, Includes the following steps: (1) The coarse-particle fluidized flotation tailings of the molybdenum ore were subjected to multi-stage screening using three types of sieves: 500μm, 250μm, and 150μm. The product over the 500μm sieve was denoted as component A, the product over the 250μm sieve was denoted as component B, the product over the 150μm sieve was denoted as component C, and the product under the 150μm sieve was denoted as component D. (2) The component D is ball-milled for the first time, and the ball-milled component D is made into a cementitious material; The ball-milled component D, fly ash, slag, gypsum, activator and water-reducing agent are mixed and then ball-milled a second time to obtain the cementitious material. The mass ratio of ball-milled component D, fly ash, slag, gypsum, and activator is 25-50:15-25:5-15:15-25:1.5-6.0, and the mass fraction of water-reducing agent in the cementitious material is 0.3-1.8% of the total mass of component D, fly ash, slag, gypsum, and activator. (3) Mix the cementitious material in step (2) with components A, B and C in step (1), add foaming agent, let stand, and hydraulically mold to obtain precast concrete; The mass ratio of cementitious material, component A, component B and component C is 35-50: 5-15: 10-25: 15-30; (4) Curing the precast concrete described in step (3) yields high-strength concrete.

2. The method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore according to claim 1, characterized in that, In step (2), the first ball milling time is 2.5-5.0h.

3. The method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore according to claim 1, characterized in that, In step (3), the foaming agent accounts for 1.0-2.5% of the total mass of the cementitious material, component A, component B and component C.

4. A method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore according to any one of claims 1-3, characterized in that, In step (3), the settling time is 4.5-6.5h.

5. A method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore according to any one of claims 1-3, characterized in that, In step (4), the curing process includes first transferring the precast concrete to a cement rapid curing box for the first curing, demolding, and then transferring the demolded precast concrete to an autoclave for autoclaving to obtain high-strength concrete.

6. The method for recovering coarse-particle fluidized bed flotation tailings of molybdenum ore according to claim 5, characterized in that, The relative humidity for the first curing is 94-98%, the curing temperature is 15-25℃, and the curing time is 18-30 hours.

7. A type of concrete prepared by any one of claims 1-6.

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