A screening process for useful minerals in waste rock

Abstract

The present application belongs to the technical field of mineral processing, and specifically relates to a screening process for useful minerals in waste rock, comprising the following steps: S1, screening the raw ore by using an intelligent mineral processing machine to obtain qualified ore and first waste rock; S2, screening the first waste rock to obtain second waste rock and tailings; S3, processing the second waste rock by using a dynamic screen jigging machine to obtain first concentrate and second concentrate, wherein the diaphragm of the dynamic screen jigging machine is a 10.00R20 steel wire tire; by replacing the material of the diaphragm of the jigging machine and correspondingly adjusting the parameters of the dynamic screen jigging machine, the present application can recover the medium-grained minerals in the waste rock generated by screening tungsten ore by using the intelligent mineral processing machine, thereby reducing the loss of metals and improving the recovery rate of useful minerals and resource utilization.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, specifically a screening process for useful minerals in waste rock. Background Technology

[0002] Existing intelligent mineral processing machines, in the process of processing raw ore to obtain tungsten ore and waste rock, cannot effectively identify and process fine minerals within a certain particle size range. Taking the X-ray mineral processing machine currently used in concentrators as an example, this equipment cannot achieve 100% recovery of valuable metal minerals. In the waste rock produced after X-ray mineral processing, especially in the fine-grained waste rock, a small amount of valuable metal minerals, such as wolframite and chalcopyrite, remain and are easily discarded along with gangue minerals, resulting in the loss of useful minerals. Therefore, a solution is needed to recover medium-grained minerals from the waste rock processed by intelligent mineral processing machines, in order to recover metals such as tungsten and copper from medium-grained minerals (particle size 6-22mm) in the waste rock and prevent mineral loss. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a screening process for useful minerals in waste rock, comprising the following steps:

[0004] S1. The raw ore is screened using an intelligent ore beneficiation machine to obtain qualified ore and first waste rock. The particle size of the first waste rock is less than or equal to 45mm. The tungsten grade of the raw ore is 0.34%~0.37%, and the copper grade is 0.09%~0.12%.

[0005] S2. The first waste rock is screened to obtain a second waste rock and tailings, wherein the particle size of the second waste rock is less than or equal to 22 mm, and the particle size of the tailings is greater than 22 mm.

[0006] S3. The second waste rock is processed using a moving screen jig to obtain a first concentrate and a second concentrate. The diaphragm of the moving screen jig is made of 10.00R20 steel wire tires. The stroke of the moving screen jig is 28~30mm, the stroke rate is 28~36 times / min, the water pressure for replenishment is 0.5~0.8MPa, the particle size of the second concentrate is less than 6mm, and the particle size of the first concentrate is 6~22mm.

[0007] In step S1, the tungsten grade of the first waste rock is 0.005%~0.006%, and the copper grade is 0.005%~0.006%.

[0008] Specifically, step S2 involves using a single-layer vibrating screen to screen the first waste rock to obtain the second waste rock.

[0009] In step S2, the second waste rock has a tungsten content of 0.0075%~0.0082%, a copper content of 0.0058%~0.0065%, and a bulk density of 1.5~1.6 g / cm³. 3 In the second waste rock, among the minerals with a particle size of less than or equal to 6 mm, the proportion of minerals with a particle size of 0.5 to 6 mm is greater than or equal to 60 wt%.

[0010] In step S2, the specific surface area of ​​tungsten ore in the second waste rock is less than or equal to 1.2 m². 2 / g, the specific surface area of ​​chalcopyrite is less than or equal to 1.0m². 2 / g.

[0011] Step S1 further includes re-selecting the qualified ore; step S3 further includes re-selecting the second concentrate.

[0012] The recovery rate of tungsten in the first concentrate is greater than or equal to 80%, and the recovery rate of copper is greater than or equal to 50%.

[0013] The first concentrate has a tungsten grade of 17% to 23% and a copper grade of 10% to 12.2%.

[0014] This invention replaces the material of the jig diaphragm and adjusts the parameters of the moving screen jig accordingly, enabling it to recover medium-grained minerals from the waste rock produced by the intelligent mineral processing machine during the screening of tungsten ore. This reduces metal loss and improves the recovery rate of useful minerals and resource utilization. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the process flow of the present invention.

[0017] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] The technical solutions described below in conjunction with the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a screening process for useful minerals in waste rock, comprising the following steps:

[0020] S1. The raw ore is screened using an intelligent mineral processing machine to obtain qualified ore and first waste rock, wherein the particle size of the first waste rock is less than or equal to 45mm.

[0021] The intelligent mineral processing machine used in the embodiments of the present invention is an X-ray mineral processing machine, specifically the X-ray mineral processing machine (model XRT-1400) of Ganzhou Good Friends Technology Co., Ltd. The purpose of the present invention is to recover medium-grained minerals from the waste rock after screening. The qualified ore selected by the intelligent mineral processing machine is transported to the gravity separation workshop for subsequent screening and recovery.

[0022] S2. The first waste rock is screened to obtain a second waste rock and tailings, wherein the particle size of the second waste rock is less than or equal to 22 mm, and the particle size of the tailings is greater than 22 mm.

[0023] S3. The second waste rock is processed using a moving screen jig to obtain a first concentrate and a second concentrate. The diaphragm of the moving screen jig is made of 10.00R20 steel wire tires. The stroke of the moving screen jig is 28~30mm, the stroke rate is 28~36 times / min, the water pressure for replenishment is 0.5~0.8MPa, the particle size of the second concentrate is less than 6mm, and the particle size of the first concentrate is 6~22mm.

[0024] The second concentrate in this invention is also transported to the gravity separation workshop for subsequent screening and recovery.

[0025] Please see Figure 1 , Figure 1 This is a schematic diagram of the process flow of the present invention.

[0026] This invention, through specially designed parameters and diaphragm of the moving screen jig, enables it to specifically process tungsten with a grade of 0.0075%~0.0082%, copper with a grade of 0.0058%~0.0065%, and bulk density of 1.5~1.6 g / cm³, produced by waste disposal from intelligent mineral processing machines. 3 The wolframite tailings (i.e., the second waste rock) with a particle size of 22 mm or less have a mineral particle size of 0.5-6 mm or less, and the proportion of such minerals is greater than or equal to 60 wt%. If the proportion of fine-grained minerals (less than 0.5 mm) is too high, it will increase the adhesion of the slurry during the jig separation process, affecting the recovery effect. The specific surface area of ​​the wolframite in this wolframite tailings is less than 1.2 m². 2 / g, copper ore with a specific surface area less than or equal to 1.0m² 2 / g, to ensure that the particle size of valuable minerals containing tungsten, copper and other valuable metals is within the qualified range, so that the jig can effectively recover the above valuable minerals and reduce the loss of valuable minerals.

[0027] The jigging machine used in the embodiments of the present invention is a rocker arm type. In the prior art, the diaphragm of such a jigging machine is connected to the jigging box by an elastic component to ensure that it can bear the weight of the jigging box and can reciprocate vertically under the drive of the rocker arm, thereby realizing jigging. The jigging machine in the present invention is different from the prior art in that it uses 10.00R20 steel wire tires instead of diaphragms and elastic components (such as springs), and the tires are sealed to the jigging box and the water tank, thereby meeting the stroke and number of strokes required in the present invention to jig the waste rock of the intelligent mineral processing machine in the present invention, and realizing the recovery of useful metals from the waste rock.

[0028] In the dynamic jigging machine used in this invention, to increase the up-and-down pulse force generated by the diaphragm and improve the stratification efficiency of high-density useful minerals and low-density gangue minerals, a 10.00R20 steel wire tire is used as the diaphragm. The pulse force generated during the process of being pressed down and returning to its original shape can effectively increase the lifting effect of the rising water flow on coarse-grained minerals during the jigging cycle, further effectively separating the wolframite tailings produced by the intelligent concentrator, and improving the jigging machine's beneficiation recovery rate. If the tire thickness is too small, the diaphragm will not be able to effectively compensate for the upward movement during the jigging cycle. Adding water causes minerals to rise and stratify, which reduces the recovery rate of the jig and the grade of the concentrate, resulting in the loss of valuable metals and waste of resources. At the same time, if the mass of minerals and water in the jig screen box is too large, the basic support of the diaphragm is insufficient, and it cannot generate enough pulse action. If tires with excessive thickness are used, the force required to deform them will increase significantly. When the mass of minerals and water in the screen box is insufficient as the screen box is pressed down, the tire deformation is small and cannot provide the pulse action required for jiging, resulting in a decrease in mineral processing efficiency.

[0029] In this embodiment of the invention, a Double Coin 10.00R20-18PR tire is used as the diaphragm of the dynamic screen jig. The tire has a cross-sectional width of about 254mm, an outer diameter of about 1068mm, and a ply rating of 18PR.

[0030] Example 1

[0031] A screening process for useful minerals in waste rock includes the following steps:

[0032] S1. The raw ore is screened using an intelligent ore beneficiation machine to obtain qualified ore and 650t of first waste rock. The particle size of the first waste rock is less than or equal to 45mm. The tungsten grade of the raw ore is 0.36% and the copper grade is 0.1%. The tungsten grade of the first waste rock is 0.005% and the copper grade is 0.006%. The qualified ore is then transported to the gravity separation workshop.

[0033] S2. The first waste rock is screened to obtain 290t of second waste rock and 360t of tailings. The particle size of the second waste rock is less than or equal to 22mm, and the particle size of the tailings is greater than 22mm. The tungsten grade of the second waste rock is 0.008%, the copper grade is 0.0061%, and the bulk density is 1.5g / cm³. 3 In the second waste rock, among the minerals with a particle size of less than or equal to 6 mm, the proportion of minerals with a particle size of 0.5 to 6 mm was 65 wt%. After testing, there were 240 tons of waste rock with a particle size of 6 to 22 mm in the second waste rock.

[0034] S3. The second waste rock is processed using a dynamic screen jig to obtain 72.13 kg of first concentrate and second concentrate (mass not measured). The diaphragm of the dynamic screen jig is made of Double Coin 10.00R20 steel wire tires. The stroke of the dynamic screen jig is 28 mm, the stroke rate is 28 times / min, and the water pressure for adding water is 0.5 MPa. The particle size of the second concentrate is less than 6 mm, and the particle size of the first concentrate is 6~22 mm. The second concentrate is transported to the gravity separation workshop.

[0035] Tests showed that the tungsten grade in the first concentrate was 22.76% and the copper grade was 12.17%.

[0036] Calculations show that the recovery rate of tungsten in the first concentrate is 85.5%, and the recovery rate of copper is 60%.

[0037] Example 2

[0038] Unlike Example 1, the stroke of the moving screen jig is 29 mm, the stroke rate is 32 times / min, the water pressure for adding water is 0.7 MPa, and 71.96 kg of the first concentrate is obtained.

[0039] Tests showed that the tungsten grade in the first concentrate was 22.36%, and the copper grade was 11.8%.

[0040] Calculations show that the recovery rate of tungsten in the first concentrate is 83.8%, and the recovery rate of copper is 58%.

[0041] Example 3

[0042] Unlike Example 1, the stroke of the moving screen jig is 30 mm, the stroke rate is 36 times / min, the water pressure for adding water is 0.8 MPa, and 71.19 kg of the first concentrate is obtained.

[0043] Tests showed that the tungsten grade in the first concentrate was 22.25%, and the copper grade was 11.93%.

[0044] Calculations show that the recovery rate of tungsten in the first concentrate is 82.5%, and the recovery rate of copper is 52.8%.

[0045] Comparative Example 1

[0046] Unlike Example 3, the water pressure added was 0.4 MPa, yielding 68.25 kg of the first concentrate;

[0047] Tests showed that the tungsten grade in the first concentrate was 12.8%, and the copper grade was 5.42%.

[0048] Calculations show that the recovery rate of tungsten in the first concentrate is 45.5%, and the recovery rate of copper is 23%.

[0049] Comparative Example 2

[0050] Unlike Example 1, the stroke of the moving screen jig is 31 mm, the stroke rate is 25 times / min, the water pressure for adding water is 0.8 MPa, and 69.33 kg of first concentrate is obtained.

[0051] Tests showed that the tungsten grade in the first concentrate was 16.2% and the copper grade was 9.77%.

[0052] Calculations show that the recovery rate of tungsten in the first concentrate is 58.5%, and the recovery rate of copper is 42.1%.

[0053] Comparative Example 3

[0054] Unlike Example 1, the water pressure added was 1 MPa, yielding 74 kg of the first concentrate;

[0055] Tests showed that the tungsten grade in the first concentrate was 16.5%, and the copper grade was 9.85%.

[0056] Calculations show that the recovery rate of tungsten in the first concentrate is 63.6%, and the recovery rate of copper is 45.3%.

[0057] Comparative Example 4

[0058] Unlike Example 1, the stroke of the moving screen jig is 25 mm, the stroke rate is 38 times / min, and 64.57 kg of first concentrate is obtained;

[0059] Tests showed that the tungsten grade in the first concentrate was 16.8%, and the copper grade was 10.24%.

[0060] Calculations show that the recovery rate of tungsten in the first concentrate is 56.5%, and the recovery rate of copper is 41.1%.

[0061] This invention, by adjusting the parameter settings of the dynamic screen jig and changing the material of the jig diaphragm, can recover medium-grained minerals from the waste rock produced by the intelligent mineral processing machine during the screening of tungsten ore, thereby reducing metal loss and improving the recovery rate of useful minerals and resource utilization.

[0062] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A screening process for useful minerals in waste rock, characterized in that, Includes the following steps: S1. The raw ore is screened using an intelligent ore beneficiation machine to obtain qualified ore and first waste rock. The particle size of the first waste rock is less than or equal to 45mm. The tungsten grade of the raw ore is 0.34%~0.37%, and the copper grade is 0.09%~0.12%. S2. The first waste rock is screened to obtain a second waste rock and tailings, wherein the particle size of the second waste rock is less than or equal to 22 mm, and the particle size of the tailings is greater than 22 mm. S3. The second waste rock is processed by a moving screen jig to obtain a first concentrate and a second concentrate. The diaphragm of the moving screen jig is made of 10.00R20 steel wire tires. The stroke of the moving screen jig is 28~30mm, the stroke rate is 28~36 times / min, the water pressure for replenishing water is 0.5~0.8MPa, the particle size of the second concentrate is less than 6mm, and the particle size of the first concentrate is 6~22mm. In step S1, the tungsten grade of the first waste rock is 0.005%~0.006%, and the copper grade is 0.005%~0.006%. In step S2, the second waste rock has a tungsten content of 0.0075%~0.0082%, a copper content of 0.0058%~0.0065%, and a bulk density of 1.5~1.6 g / cm³. 3 In the second waste rock, among the minerals with a particle size of less than or equal to 6 mm, the proportion of minerals with a particle size of 0.5 to 6 mm is greater than or equal to 60 wt%.

2. The screening process for valuable minerals in waste rock according to claim 1, characterized in that, Specifically, step S2 involves using a single-layer vibrating screen to screen the first waste rock to obtain the second waste rock.

3. The screening process for useful minerals in waste rock according to claim 1, characterized in that, In step S2, the specific surface area of ​​tungsten ore in the second waste rock is less than or equal to 1.2 m². 2 / g, the specific surface area of ​​chalcopyrite is less than or equal to 1.0m². 2 / g.

4. The screening process for useful minerals in waste rock according to claim 1, characterized in that, Step S1 further includes re-selecting the qualified ore; step S3 further includes re-selecting the second concentrate.

5. The screening process for useful minerals in waste rock according to claim 1, characterized in that, The recovery rate of tungsten in the first concentrate is greater than or equal to 80%, and the recovery rate of copper is greater than or equal to 50%.

6. The screening process for useful minerals in waste rock according to claim 5, characterized in that, The first concentrate has a tungsten grade of 17% to 23% and a copper grade of 10% to 12.2%.

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