CN112517235A - Method for improving comprehensive utilization of durite tailings - Google Patents
Method for improving comprehensive utilization of durite tailings Download PDFInfo
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- CN112517235A CN112517235A CN202011318989.2A CN202011318989A CN112517235A CN 112517235 A CN112517235 A CN 112517235A CN 202011318989 A CN202011318989 A CN 202011318989A CN 112517235 A CN112517235 A CN 112517235A
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Abstract
The invention discloses a method for improving comprehensive utilization of durite tailings, which comprises the following steps: the method comprises the following steps of carrying out graded desliming on the durite tailings by a two-stage spiral classifier, selecting and screening the diopside in the tailings, enabling overflow products subjected to the graded desliming twice to flow into a high-efficiency thickener for concentration, returning overflow of the thickener to an on-site production process flow for use as circulating water, conveying underflow of the thickener to a hydrocyclone by a slurry pump for graded desliming, wherein the overflow products are slurry containing mud, carrying out compression and dehydration by a plate and frame filter press to realize dry discharge of the tailings, returning the water subjected to the compression and dehydration to a circulating water tank for use as the circulating water, and being simple in the whole process flow, low in energy consumption and low in production cost, capable of recovering useful minerals in the durite to the maximum extent, and capable of achieving the recovery rates of more than 95% for garnet and diopside; has no influence on the environment, and realizes the modern production without tail, waste and pollution.
Description
Technical Field
The invention belongs to the technical field of mineral separation, and particularly relates to a method for improving comprehensive utilization of durite tailings.
Background
The tailings treatment is an important part of the comprehensive utilization of resources. A large amount of domestic tailings usually have the characteristics of poor quality, fine quality and impurity, particularly, the common mineral separation process and equipment of certain difficultly-separated tailings are difficult to efficiently recover, the maximum recovery of useful minerals cannot be realized, a plurality of mining enterprises do not have the strength of tailing recleaning plants, the economic level and mineral separation technology limit in the early development stage of enterprises, most of the selection plants adopt a rough operation mode, so that a plurality of valuable minerals are discarded along with the tailings, the discharge of the tailings is increased, the great waste of mine resources is caused, improper utilization of the tailings not only occupies the land and causes the waste of resources, but also brings serious pollution and harm to the living environment of people, and the environment is deteriorated. How to realize the modern production without tail, waste and pollution to achieve the purpose of promoting the comprehensive treatment of mine environment is also an important subject of common concern of China and all countries in the world.
The associated minerals in the tailings have large stock and high value. Natural ores are basically symbiotic and associated with various minerals, and the value of useful minerals in tailings cannot be underestimated. The main substances in the durite tailings are fine-grained garnet, green pyroxene and fine-grained slime, the recycling of useful minerals in the tailings is mainly affected by primary slime and secondary slime generated in production, the slime has a fine grain grade and is slowly settled, the yield is high, and the recycling is a constraint factor for improving the utilization rate of the tailings in many mines.
Disclosure of Invention
The invention aims to provide a method for improving the comprehensive utilization of the durite tailings, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for improving comprehensive utilization of durite tailings comprises the following steps:
the method comprises the following steps: carrying out size mixing on the main ore of the durenite tailings, namely fine-grained garnet, green pyroxene and slime to form 10-15% low-concentration ore pulp;
step two: the low-concentration durite tailing pulp enters a No. 1 spiral classifier for desliming classification, an overflow product is mainly slime with the concentration lower than 15%, and return sand is pulp with the concentration more than 50% and consists of fine garnet, green pyroxene and a small amount of slime;
step three: the returned sand obtained in the second step is subjected to size mixing to form 20-25% of low-concentration ore pulp, and then enters a No. 2 spiral classifier for secondary desliming and classification, wherein the main material of the returned sand subjected to classification and desliming is green pyroxene, and overflow products are fine-grained garnet and slime with lower concentration;
step four: step two and step three, the overflow products of No. 1 and No. 2 ore washers enter a high-efficiency thickener for thickening, the concentration of the ore pulp is improved, and the overflow water of the thickener returns to the production flow to form circulating water for reuse;
step five: the concentration of the bottom flow product of the high-efficiency thickener is 45 percent, the bottom flow product is conveyed to a swirler by a slurry pump for graded desliming, two products can be obtained after grading, the overflow product is mainly slime, and the settled sand is mainly fine-grained garnet;
step six: conveying the overflow product of the step five to a filter press by a slurry pump for filter pressing, wherein the water content of the filter-pressed product is lower than 10%, the filter-pressed product can be directly conveyed to a backfilling pit of a mining pit or used as a raw material of a building material, and the filter-pressed water is returned to the process flow to be used as circulating water;
step seven: the settled sand produced by the six cyclones is mainly fine-grained garnet, a filter is adopted for filtering to form 10% fine-grained garnet fine sand, the fine-grained garnet fine sand is returned to the process flow for retreatment, and the filtered water is returned to the process flow to be used as circulating water.
Preferably, the spiral classifier in step two and step three is a high weir type double spiral classifier with a diameter of 1.2 meters.
Preferably, the high-efficiency thickener in the fourth step is an NXZ-30 high-efficiency thickener with the diameter of 30 meters.
Preferably, the cyclone in the fifth step is a cyclone with the model number of FX-350, the diameter of the sand settling nozzle is 70mm, and the diameter of the overflow port is 100 mm.
Preferably, the filter press in step six is a plate and frame filter press.
Preferably, the filter in step seven is a plate disc filter.
Compared with the prior art, the invention has the beneficial effects that: the invention aims to effectively recover fine-grained garnet and green pyroxene in the tailings, improve the resource utilization rate, further treat slime in the tailings and realize dry discharge of the tailings, and the method has low production cost and truly realizes 'tailless, waste-free and pollution-free' modern production of a selected factory; the whole process flow is simpler, the energy consumption is lower, the production cost is low, the useful minerals in the ores are recovered to the maximum extent, and the environment is not polluted.
Drawings
FIG. 1 is a flow diagram of a beneficiation process in an embodiment of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides a technical solution: a method for improving the comprehensive utilization rate of the durite tailings comprises the following steps:
the method comprises the following steps: carrying out size mixing on the main ore of the durenite tailings, namely fine-grained garnet, green pyroxene and slime to form 10-15% low-concentration ore pulp;
step two: the low-concentration durite tailing pulp enters a No. 1 spiral classifier for desliming classification, an overflow product is mainly slime with the concentration lower than 15%, and return sand is pulp with the concentration more than 50% and consists of fine garnet, green pyroxene and a small amount of slime;
step three: the returned sand obtained in the second step is subjected to size mixing to form 20-25% of low-concentration ore pulp, and then enters a No. 2 spiral classifier for secondary desliming and classification, wherein the main material of the returned sand subjected to classification and desliming is green pyroxene, and overflow products are fine-grained garnet and slime with lower concentration;
step four: step two and step three, the overflow products of No. 1 and No. 2 ore washers enter a high-efficiency thickener for thickening, the concentration of the ore pulp is improved, and the overflow water of the thickener returns to the production flow to form circulating water for reuse;
step five: the concentration of the bottom flow product of the high-efficiency thickener is 45 percent, the bottom flow product is conveyed to a swirler by a slurry pump for graded desliming, two products can be obtained after grading, the overflow product is mainly slime, and the settled sand is mainly fine-grained garnet;
step six: conveying the overflow product of the step five to a filter press by a slurry pump for filter pressing, wherein the water content of the filter-pressed product is lower than 10%, the filter-pressed product can be directly conveyed to a backfilling pit of a mining pit or used as a raw material of a building material, and the filter-pressed water is returned to the process flow to be used as circulating water;
step seven: the settled sand produced by the six cyclones is mainly fine-grained garnet, a filter is adopted for filtering to form 10% fine-grained garnet fine sand, the fine-grained garnet fine sand is returned to the process flow for retreatment, and the filtered water is returned to the process flow to be used as circulating water.
In this embodiment, preferably, the spiral classifier in the second step and the third step is a high weir type single spiral classifier with a diameter of 1.2 m, the installation inclination angle of the spiral classifier is smaller, and the groove body of the spiral classifier is lengthened compared with that of a common spiral classifier, so that the spiral classifier has the advantages of large treatment capacity and high efficiency of classification and desliming.
In this embodiment, preferably, the high-efficiency thickener in the fourth step is an NXZ-30 high-efficiency thickener with a diameter of 30 meters, and has a large diameter, a large treatment capacity, a good concentration effect, and low power consumption.
In this embodiment, the cyclone in step five is preferably FX-350 in size, the sand settling nozzle is 70mm in diameter, and the overflow port is 100mm in diameter, and the cyclone has the advantages of no moving parts in the cyclone, simple structure and convenient use. Compared with other classification separation equipment, the cyclone has higher classification efficiency which can reach more than 80 percent, and the classification granularity of the cyclone is fine, thus meeting the requirements of industrial production; in addition, the cyclone has low manufacturing cost, less material consumption and more economic value.
In this embodiment, preferably, the filter press in the sixth step is a plate and frame filter press, which has a simpler structure, is easy to operate, runs stably, and has a flexible selection range of filter area and a small floor area; has strong adaptability to materials.
In this embodiment, preferably, the filter in the seventh step is a plate disc filter, and the disc filter has the advantages of thorough filtration, high working efficiency, long service life, simple structure, easy operation, and stable operation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for improving comprehensive utilization of durite tailings is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: carrying out size mixing on the main ore of the durenite tailings, namely fine-grained garnet, green pyroxene and slime to form 10-15% low-concentration ore pulp;
step two: the low-concentration durite tailing pulp enters a No. 1 spiral classifier for desliming classification, an overflow product is mainly slime with the concentration lower than 15%, and return sand is pulp with the concentration more than 50% and consists of fine garnet, green pyroxene and a small amount of slime;
step three: the returned sand obtained in the second step is subjected to size mixing to form 20-25% of low-concentration ore pulp, and then enters a No. 2 spiral classifier for secondary desliming and classification, wherein the main material of the returned sand subjected to classification and desliming is green pyroxene, and overflow products are fine-grained garnet and slime with lower concentration;
step four: step two and step three, the overflow products of No. 1 and No. 2 ore washers enter a high-efficiency thickener for thickening, the concentration of the ore pulp is improved, and the overflow water of the thickener returns to the production flow to form circulating water for reuse;
step five: the concentration of the bottom flow product of the high-efficiency thickener is 45 percent, the bottom flow product is conveyed to a swirler by a slurry pump for graded desliming, two products can be obtained after grading, the overflow product is mainly slime, and the settled sand is mainly fine-grained garnet;
step six: conveying the overflow product of the step five to a filter press by a slurry pump for filter pressing, wherein the water content of the filter-pressed product is lower than 10%, the filter-pressed product can be directly conveyed to a backfilling pit of a mining pit or used as a raw material of a building material, and the filter-pressed water is returned to the process flow to be used as circulating water;
step seven: the settled sand produced by the six cyclones is mainly fine-grained garnet, a filter is adopted for filtering to form 10% fine-grained garnet fine sand, the fine-grained garnet fine sand is returned to the process flow for retreatment, and the filtered water is returned to the process flow to be used as circulating water.
2. The method for improving comprehensive utilization of durite tailings according to claim 1, wherein the method comprises the following steps: the spiral classifier in the second step is a high weir type double-spiral classifier with the diameter of 1.2 meters.
3. The method for improving comprehensive utilization of durite tailings according to claim 1, wherein the method comprises the following steps: the high-efficiency thickener in the fourth step is an NXZ-30 high-efficiency thickener with the diameter of 30 meters.
4. The method for improving comprehensive utilization of durite tailings according to claim 1, wherein the method comprises the following steps: the cyclone in the step five is the cyclone with the model number of FX-350, the diameter of the sand settling nozzle is 70mm, and the diameter of the overflow port is 100 mm.
5. The method for improving comprehensive utilization of durite tailings according to claim 1, wherein the method comprises the following steps: and the filter press in the sixth step is a plate and frame filter press.
6. The method for improving comprehensive utilization of durite tailings according to claim 1, wherein the method comprises the following steps: the filter in the seventh step is a plate disc type filter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114534904A (en) * | 2022-01-28 | 2022-05-27 | 江苏金红新材料股份有限公司 | Beneficiation method for fine-grain embedded garnet ore |
| CN115399217A (en) * | 2022-08-17 | 2022-11-29 | 瑞林环境科技有限公司 | Fine-grain tailing matrix material and preparation method and application thereof |
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Cited By (2)
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| CN114534904A (en) * | 2022-01-28 | 2022-05-27 | 江苏金红新材料股份有限公司 | Beneficiation method for fine-grain embedded garnet ore |
| CN115399217A (en) * | 2022-08-17 | 2022-11-29 | 瑞林环境科技有限公司 | Fine-grain tailing matrix material and preparation method and application thereof |
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