Method for recycling tailings of iron ore elutriation machine

Abstract

The invention discloses a method for recycling tailings of an iron ore elutriator, which relates to the technical field of iron ore elutriation and is technically characterized by comprising the following steps of: 1, analyzing the properties of the tailings mainly including chemical components, mineral composition, particle size distribution, density difference, magnetic properties and harmful element content; 2, pipelines are installed, specifically, two DN350 pipelines are additionally arranged on the elutriation machine tailing box, one DN350 pipeline is connected with the elutriation machine tailing box and a first-section mill, the other DN350 pipeline is connected with the elutriation machine tailing box and a second-section tower mill classification pump pool, and meanwhile a valve is additionally arranged on each DN350 pipeline; thirdly, tailings of the elutriation machine are returned to the ore dressing technological process to be ground and separated again so that tailings metal can be collected, and the tailings metal loss can be reduced; the elutriation machine tailings are returned to the beneficiation technological process for regrinding and reseparation, after the elutriation tailings are subjected to re-grinding, the metal amount of the tailings can be completely collected, meanwhile, whether the tailings have the recovery value or not can be checked, and the metal recovery rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of iron ore washing, and in particular to a method for recovering tailings from an iron ore washing machine. Background Art

[0002] Iron ore washing refers to the process of effectively separating useful minerals from gangue minerals, impurities, etc. in iron ore through specific equipment and processes. This process usually occurs at the end of the iron ore beneficiation process and plays the role of ultimately refining and reducing impurities. With the continuous development of technology, iron ore washing equipment will become more efficient, large-scale, automated, environmentally friendly and energy-saving.

[0003] A Chinese patent with the publication number CN115608507A discloses a beneficiation method for recovering fine-grained refractory magnetite, comprising the following steps: Step 1, after crushing the ore, discard the tailings through dry magnetic separation, and then use high-pressure roller mill and wet pre-selection to obtain pre-selected rough concentrate; Step 2, the pre-selected rough concentrate is subjected to stage grinding, stage magnetic separation, and elutriation by an elutriation machine to obtain a primary elutriation concentrate and an elutriation middling; Step 3, the elutriation middling is subjected to concentrated magnetic separation, tower mill re-grinding, stage magnetic separation, and elutriation by an elutriation machine to obtain a secondary elutriation concentrate; The primary elutriation concentrate and the secondary elutriation concentrate are combined into a final iron concentrate. The method of the present invention not only improves the grade of the iron concentrate, but also improves the recovery rate of iron ore.

[0004] As mentioned above, the patent provides a mineral processing method for recovering fine-grained difficult-to-select magnetite, which can improve the grade of iron concentrate and the recovery rate of iron ore. However, when the current washing machine is working, the tailings of the washing machine are merged with the secondary and tertiary magnets, and part of them enter the disc recovery machine for recovery and return to the main process, but about half of the tailings still directly enter the concentration tank for concentration and are used for underground filling aggregates. This will still cause unreasonable metal loss, and the overall concentrate recovery rate needs to be improved. Summary of the invention

[0005] The invention provides a method for recovering tailings of an iron ore washing machine to solve the problems raised in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for recovering tailings from an iron ore washing machine, comprising the following steps:

[0007] Step 1: Analyze the properties of tailings, including chemical composition, mineral composition, particle size distribution, density difference, magnetic properties and harmful element content. The magnetic metal substances are separated from magnetic minerals and non-magnetic minerals by magnetic separation, and then the useful components are recovered by concentration and filtration, so as to separate the gangue minerals;

[0008] Step 2: Install pipelines. Add two DN350 pipelines to the tailings box of the elutriator. One DN350 pipeline connects the tailings box of the elutriator with the first-stage mill, and the other DN350 pipeline connects the tailings box of the elutriator with the second-stage mill grading pump pool. At the same time, add a valve to each of the two DN350 pipelines to control the on and off of the two DN350 pipelines respectively.

[0009] Step 3: Tailings recycling, returning the tailings from the panning machine to the mineral processing process for regrinding and re-selection to collect tailings metals and reduce the loss of tailings metals;

[0010] Step 4: Sampling experiment: sampling the tailings of the panning machine for several days, conducting laboratory tests, examining the concentrate grade and concentrate yield, and verifying whether it has recovery value;

[0011] Step 5: On-site debugging. After passing the experimental inspection, the production site debugging will be carried out and finally put into use.

[0012] Preferably, the two DN350 pipes in the second step are used to add water to the first stage mill and to add water to the second stage tower mill.

[0013] Preferably, after the second step is completed, the tailings from the washing machine are collected into the main tailings box, recovered, and then incorporated into the main process for regrinding and reselection.

[0014] Compared with the prior art, the present invention provides a method for recycling tailings from an iron ore washing machine, which has the following beneficial effects:

[0015] 1. The tailings from the panning machine are returned to the beneficiation process for regrinding and re-selection. After re-grinding, the metal content of the tailings can be fully recovered, and at the same time, it can be tested whether it has recycling value, thereby improving the metal recovery rate;

[0016] 2. By collecting the tailings from the washing machine into the total tailings box, recycling them and then incorporating them into the main process, it is possible to avoid the problem of large fluctuations in the amount of tailings slurry, which will be reused in the first stage mill and occupy the mill's processing capacity, thereby ensuring the grinding effect of the primary ore slurry.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0020] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, a movable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figure 1 As shown, in this embodiment, a method for recycling tailings from an iron ore washing machine comprises the following steps:

[0024] Step 1: Analyze the properties of tailings, which mainly include chemical composition, mineral composition, particle size distribution, density difference, magnetic properties and harmful element content. Magnetic metal substances can be separated from magnetic minerals and non-magnetic minerals by magnetic separation, and then the useful components can be recovered by concentration, filtration and other methods, so as to separate the gangue minerals;

[0025] Step 2: Install pipelines. Add two DN350 pipelines to the tailings box of the elutriator. One DN350 pipeline connects the tailings box of the elutriator with the first-stage mill, and the other DN350 pipeline connects the tailings box of the elutriator with the second-stage mill grading pump pool. At the same time, add a valve to each of the two DN350 pipelines to control the on and off of the two DN350 pipelines respectively.

[0026] Step 3: Tailings recycling, returning the tailings from the panning machine to the mineral processing process for regrinding and re-selection to collect tailings metals and reduce the loss of tailings metals;

[0027] Step 4: Sampling experiment: sampling the tailings of the panning machine for several days, conducting laboratory tests, examining the concentrate grade and concentrate yield, and verifying whether it has recovery value;

[0028] Step 5: On-site debugging. After passing the experimental inspection, the production site debugging will be carried out and finally put into use.

[0029] Through the above technical scheme, some properties of tailings are analyzed through the first step of property analysis, which is convenient for the subsequent formulation of recycling methods. In addition, two DN350 pipelines are added, and valve controls are added to these two DN350 pipelines to control the circulation of tailings. These tailings are collected after passing through the first-stage mill and the second-stage tower mill classification pump pool. After analyzing the properties of the tailings, the magnetic minerals are separated from the non-magnetic minerals by magnetic separation, and then the useful components are recovered by concentration, filtration and other methods, so as to separate the gangue minerals, and then return to the mineral processing process for regrinding and re-selection to ensure the recovery rate of the metal. At the same time, in order to ensure the recovery The necessity of recycling is to establish a laboratory to experiment on this recycling method to test whether it has recycling value. Finally, when the test is qualified, it can be debugged on the production site and finally put into use. Under experimental conditions, after experiments, the washed tailings have a total iron content of 11.05% and a magnetic iron content of 1.21%. When the grinding fineness is -0.043mm and the content is 92%, and the magnetic field strength is 1200Gs, after separation, the concentrate has a total iron content of 61.03%, a yield of 1.34%, a recovery rate of 7.41%, and a total iron content of 10.37%. The above data show that the washed tailings have separation value after re-grinding and can improve the metal recovery rate.

[0030] Furthermore, the two DN350 pipes in the second step were used to add water to the first stage mill and the second stage mill at the same time; the experimental conditions in the fourth step were set to -0.043mm content 92% and magnetic field strength 1200Gs.

[0031] Through the above technical solution, water is added to the first stage mill and the second stage tower mill through two DN350 pipelines. After adding water, the circulation of internal tailings is facilitated, and then the water is discharged through filtration, so that the final concentrate can be collected.

[0032] Furthermore, after the second step, the tailings from the panning machine are collected into the main tailings box, recycled and then incorporated into the main process for regrinding and reselection.

[0033] Through the above technical scheme, since the tailings from the panning machine are directly returned to the first-stage mill through the pipeline for regrinding and re-selection, the amount of slurry from this part of the tailings fluctuates greatly. If it is reused in the first-stage mill, it will occupy the processing capacity of the mill and affect the grinding effect of the primary ore slurry. Therefore, the tailings from the panning machine are subsequently collected into the total tailings box, recycled and then merged into the main process, which can avoid the problem that the amount of slurry from some tailings fluctuates greatly and is reused in the first-stage mill, which will occupy the processing capacity of the mill, thereby ensuring the grinding effect of the primary ore slurry.

[0034] Finally, it should be noted that the above implementation cases are only used to illustrate the present invention, rather than to limit the technical solutions described in the present invention; therefore, although this specification has described the present invention in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered by the scope of the claims of the present invention; the technology not described in detail in the present invention is implemented with the prior art.

Claims

1. A method for recovering tailings from an iron ore washing machine, characterized in that: The following steps are involved: Step 1: Analyze the properties of tailings, including chemical composition, mineral composition, particle size distribution, density difference, magnetic properties and harmful element content. The magnetic metal substances are separated from magnetic minerals and non-magnetic minerals by magnetic separation, and then the useful components are recovered by concentration and filtration, so as to separate the gangue minerals; Step 2: Install pipelines. Add two DN350 pipelines to the tailings box of the elutriator. One DN350 pipeline connects the tailings box of the elutriator with the first-stage mill, and the other DN350 pipeline connects the tailings box of the elutriator with the second-stage mill grading pump pool. At the same time, add a valve to each of the two DN350 pipelines to control the on and off of the two DN350 pipelines respectively. Step 3: Tailings recycling, returning the tailings from the panning machine to the mineral processing process for regrinding and re-selection to collect tailings metals and reduce the loss of tailings metals; Step 4: Sampling experiment: sampling the tailings of the panning machine for several days, conducting laboratory tests, examining the concentrate grade and concentrate yield, and verifying whether it has recovery value; Step 5: On-site debugging. After passing the experimental inspection, the production site debugging will be carried out and finally put into use.

2. The method for recovering tailings from an iron ore washing machine according to claim 1, characterized in that: The two DN350 pipes in the second step are used to add water to the first stage mill and the second stage tower mill.

3. The method for recovering tailings from an iron ore washing machine according to claim 1, characterized in that: The experimental conditions in the fourth step are set to -0.043 mm content 92% and magnetic field strength 1200 Gs.

4. The iron ore washing machine tailings recovery method according to claim 1, characterized in that: After the second step, the tailings from the washing machine are collected into the main tailings box, recycled and then incorporated into the main process for regrinding and reselection.

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