Coarse fraction flotation process

Abstract

The invention discloses a coarse fraction flotation process and belongs to the technical field of mineral separation processes. The method solves the problems of low flotation efficiency, unstable product quality, vicious circle in a coarse fraction system and the like when a current flotation process is used for treating coarse fraction useful minerals. According to the method, raw ore pulp is subjected to roughing twice to obtain foam products and roughing tailings, the roughing tailings are subjected to scavenging once to obtain scavenging-I foam products and scavenging-I tailing pulp, the scavenging-I tailing pulp enters scavenging-II operation, the scavenging-I foam products and the scavenging-II foam products are subjected to graded overflow to return to the main process, sand setting products are fed into a vertical mill, and the sand setting products are fed into the vertical mill. And grinding the coarse fraction product, grading the ground product, and then overflowing to carry out fine selection for flotation. According to the coarse-fraction flotation process, the dissociation degree of useful minerals in coarse-fraction products is increased, coarse-fraction circulation in the flotation process is reduced, and the coarse-fraction flotation process has important significance in improving mineral processing and grading efficiency and product quality.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing technology, and in particular relates to a coarse particle flotation process. Background Art

[0002] In the process of mineral processing, flotation is a common separation technology, which is widely used to extract valuable minerals from ores. However, when traditional flotation processes are used to process coarse-grained useful minerals, there are often problems such as low flotation efficiency, unstable product quality, and vicious cycles within the coarse-grained system. In addition, coarse-grained minerals are prone to destroying the "gravity-buoyancy" balance relationship during the flotation process, further affecting the flotation separation effect.

[0003] Therefore, the present application proposes a coarse particle flotation process to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of low flotation efficiency, unstable product quality, and vicious cycle in the coarse particle system when the current flotation process is used to process coarse particle useful minerals. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0005] The technical solution of the present invention:

[0006] A coarse particle flotation process comprises the following steps:

[0007] Roughing: The raw ore pulp undergoes two roughing processes to obtain foam products and roughing tailings;

[0008] Scavenging 1: The roughing tailings enter scavenging 1 for a scavenging operation to obtain scavenging 1 foam product and scavenging 1 tailings slurry. The scavenging 1 foam product is graded, the overflow product is returned to the main process, the sand settling product is fed into the vertical mill, and the scavenging 1 tailings slurry enters scavenging 2 operation;

[0009] Sweeping and selection 2: The tailings slurry from sweeping and selection 1 enters sweeping and selection 2 for the second sweeping and selection, and obtains sweeping and selection 2 foam products and sweeping and selection 2 tailings slurry. The sweeping and selection 2 foam products are classified, and the overflow returns to the main process, and the sand settling products are fed into the vertical mill;

[0010] Grinding: The foam products from scavenging 1 and scavenging 2 are fed into the vertical mill, the coarse-grained products are ground, and the discharged products from the grinding are classified and overflowed into the concentrator for flotation.

[0011] Furthermore, the raw ore pulp concentration ranges from 28% to 30%, and the -200 mesh fineness ranges from 60% to 65%.

[0012] Furthermore, the classification in the scavenging step 1 and the scavenging step 2 is specifically to separate products of different particle sizes in the ore pulp by utilizing centrifugal force and gravity difference.

[0013] Furthermore, the classification is performed using a cyclone.

[0014] The present invention has the following beneficial effects:

[0015] The coarse-grained flotation process of the present invention can effectively process the flotation process of coarse-grained ore, further improve the dissociation degree of useful minerals in the coarse-grained product, and reduce the coarse-grained circulation in the flotation process, which is of great significance for improving the mineral processing separation efficiency and product quality. Compared with the existing process technology, it solves the problem of low coarse-grained separation and recovery efficiency in the existing pre-separation operation. The ore is selectively graded and re-grinded in the process, and the scavenged concentrate is graded by a cyclone. The coarse-grained grade is subjected to a large centrifugal force in the downward spiral movement and moves in the radial outer area of ​​the cyclone cavity, so as to realize the pre-gradation of the mineral particle size in the scavenged concentrate, avoid qualified particle sizes from entering the vertical mill for re-grinding and causing over-grinding. At the same time, after the vertical mill classification and re-grinding process, the dissociation degree of the coarse-grained grade is effectively opened, the useful metals are fully exposed, and the coarse-grained circulation in the system process is reduced, thereby realizing the coarse-grained grade efficient grading and sorting operation and improving the recovery of useful metals. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of the coarse particle flotation process. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0018] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection (i.e., non-detachable connection) includes but is not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Embodiment 1, combination Figure 1 This embodiment describes a coarse particle flotation process, which includes the following steps:

[0021] Roughing: The raw ore pulp undergoes two roughing processes to obtain foam products and roughing tailings;

[0022] Scavenging 1: The roughing tailings enter scavenging 1 for a scavenging operation to obtain scavenging 1 foam product and scavenging 1 tailings slurry. The scavenging 1 foam product is graded, the overflow product is returned to the main process, the sand settling product is fed into the vertical mill, and the scavenging 1 tailings slurry enters scavenging 2 operation;

[0023] Sweeping and selection 2: The tailings slurry from sweeping and selection 1 enters sweeping and selection 2 for the second sweeping and selection, and obtains sweeping and selection 2 foam products and sweeping and selection 2 tailings slurry. The sweeping and selection 2 foam products are classified, and the overflow returns to the main process, and the sand settling products are fed into the vertical mill;

[0024] Grinding: The foam products from scavenging 1 and scavenging 2 are fed into the vertical mill, the coarse-grained products are ground, and the discharged products from the grinding are classified and overflowed into the concentrator for flotation.

[0025] In the roughing process, the raw ore pulp with a concentration of 28% to 30% and a -200 mesh fineness of 60% to 65% is selected. The classification is to use a cyclone to separate the different particle size products in the foam products of scavenging one and scavenging two by using centrifugal force and gravity difference.

[0026] The middling ore is the foam product produced by scavenging one and two. The middling ore selective classification and regrinding process is adopted, which consists of classification, grinding and flotation. Part of the scavenging concentrate in the main flotation process is first classified, and the qualified particle size is directly returned to the main process for selection. The coarse particle size and the coarse concentrate enter the vertical mill regrinding and reselection system together. After the grinding action of the vertical mill, the dissociation degree of useful minerals or conjoined bodies in the coarse particle size is further improved, which effectively alleviates the vicious cycle of the coarse particle size in the system process, improves the flotation operation conditions, and continuously and step by step grinds, classifies and floats the coarse particle size useful minerals or conjoined bodies, which is beneficial to the recovery of valuable metals and improves the comprehensive recovery rate of useful metals.

[0027] This embodiment is only an exemplary description of the present invention and does not limit its protection scope. Those skilled in the art may also make partial changes thereto. As long as they do not exceed the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A coarse particle flotation process, characterized in that: The following steps are involved: Roughing: The raw ore pulp undergoes two roughing processes to obtain foam products and roughing tailings; Scavenging 1: The roughing tailings enter scavenging 1 for a scavenging operation to obtain scavenging 1 foam product and scavenging 1 tailings slurry. The scavenging 1 foam product is graded, the overflow product is returned to the main process, the sand settling product is fed into the vertical mill, and the scavenging 1 tailings slurry enters scavenging 2 operation; Sweeping and selection 2: The tailings slurry from sweeping and selection 1 enters sweeping and selection 2 for the second sweeping and selection, and obtains sweeping and selection 2 foam products and sweeping and selection 2 tailings slurry. The sweeping and selection 2 foam products are classified, and the overflow returns to the main process, and the sand settling products are fed into the vertical mill; Grinding: The foam products from scavenging 1 and scavenging 2 are fed into the vertical mill, the coarse-grained products are ground, and the discharged products from the grinding are classified and overflowed into the concentrator for flotation.

2. A coarse particle flotation process according to claim 1, characterized in that: The raw ore pulp concentration ranges from 28% to 30%, and the -200 mesh fineness ranges from 60% to 65%.

3. A coarse particle flotation process according to claim 1, characterized in that: The classification in the scavenging first and second scavenging is specifically: separating products of different particle sizes in the ore pulp by utilizing centrifugal force and gravity difference.

4. A coarse particle flotation process according to claim 2, characterized in that: The classification is performed by using a cyclone.

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