Reselection and regrinding combined treatment process based on flotation tailing treatment

Abstract

The invention discloses a reselection and regrinding combined treatment process based on flotation tailings treatment, which comprises the following steps: S1, flotation tailings automatically flow to a spiral chute to be sorted, chute tailings are discharged into a tailings pond, and concentrate in the chute enters a 6-S table concentrator to be sorted; s2, after 6-S table concentrator separation, table concentrator tailings are discharged into a tailings pond, and table concentrator concentrate is fed into a moxa sand mill through a slurry pump for ore grinding and grading; and S3, flotation is conducted after ore grinding and grading are conducted through an Aisand mill. According to the reselection and regrinding combined treatment process based on flotation tailings treatment, the tailings automatically flow to the spiral chute for grading by utilizing height difference, and the spiral chute and the shaking table are combined to form a reselection process, so that the reselection and regrinding combined treatment process is suitable for gold-bearing tailings with relatively good floatability, and useful substances such as gold, silver and sulfur in the flotation tailings can be efficiently recycled at one time; and the effective recovery rate of the flotation tailings is high, and the recovery benefit can be remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of flotation tailings treatment, in particular to a gravity separation and regrinding combined treatment process based on flotation tailings treatment. Background Art

[0002] In my country, there are many lean or associated mineral resources in gold-bearing mines, which are difficult to separate. In the past, due to the backward mineral processing technology and improper use of mineral processing methods, many domestic mines have generally low recovery rates, serious loss of gold elements in tailings, and other useful components have not been fully utilized. The tailings grade of some mines is 0.1-0.2g / t, and the tailings grade of some mines is as high as 0.3g / t. With the increasing scarcity of gold mineral resources and prominent environmental problems today, the recovery and utilization of tailings resources has become an important issue for the sustainable development of the current mining economy. Therefore, it is of great significance to study the recovery process of useful components in tailings.

[0003] The most common processes for treating flotation tailings in my country's metal mines are mainly gravity separation, flotation or cyanide leaching. Gravity separation is a cost-effective and simple-to-operate mineral processing technology, which is particularly suitable for treating gold tailings with high density and coarse particle size. It uses the difference in specific gravity between gold and gangue minerals to achieve the separation of coarse and fine gold particles in the fluid medium. The spiral chute and shaking table gold separation are aimed at gold tailings with a particle size of 2-0.037mm, which can effectively separate ore particles with different specific gravities. The flotation method effectively separates useful minerals from gangue minerals by utilizing the differences in physical and chemical properties of the mineral surface. During the flotation process, roughing, concentrating and scavenging are carried out by using activators such as copper sulfate and high-efficiency collectors (such as butyl xanthate, butyl ammonium black medicine, isopentyl xanthate, Y89 xanthate) combined with pH adjusters (such as sulfuric acid). Cyanide leaching is a process used to recover gold from gold tailings when traditional flotation or gravity separation methods are not applicable. This method is suitable for gold-containing mineral tailings with fine particle size and good dissociation. Gold, silver, etc. are dissolved from the tailings through the affinity of cyanide and precious metals. The leached gold is then adsorbed by activated carbon, and the gold mud is separated and purified through carbon desorption and electrolytic deposition processes, and finally smelted.

[0004] The gold tailings re-selection process involves a variety of methods, each of which has its own unique advantages and applicable conditions. However, the recovery efficiency of a single method is not high, and it is difficult to recover useful substances such as gold, silver, and sulfur at one time, and the effective recovery rate of flotation tailings is low. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a combined treatment process of gravity separation and regrinding based on flotation tailings treatment, which utilizes the height difference to flow to the spiral chute for selection, and utilizes the spiral chute and the shaking table to form a gravity separation process. It is not only suitable for gold-containing tailings with good floatability, but also can efficiently recover useful substances such as gold, silver, sulfur, etc. in the flotation tailings at one time to obtain high-quality gold ore concentrate. It has a high effective recovery rate for flotation tailings, can significantly improve the recovery efficiency, and can effectively solve the problems in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a gravity separation and regrinding combined treatment process based on flotation tailings treatment, comprising the following steps: S1, flotation tailings flow to the spiral chute for sorting, the chute tailings are discharged into the tailings pond, and the concentrate in the chute enters the 6-S shaking table for sorting; S2. After being sorted by the 6-S shaking table, the shaking table tailings are discharged into the tailings pond, and the concentrate from the shaking table is fed into the Ai sand mill by a slurry pump for grinding and classification; S3, sand mill grinding and classification followed by flotation.

[0007] As a preferred technical solution of the present invention, in S3, inhibitors such as lime and butyl xanthate collector are added during the flotation process.

[0008] As a preferred technical solution of the present invention, in S3, flotation includes roughing, scavenging and concentrating, specifically: roughing the product after grinding and classification by the sand mill, concentrating the upper foam after the roughing, and obtaining the concentrate after the upper foam after the concentrating; scavenging the lower layer of slurry after the roughing, and obtaining the tailings formed by the lower layer of slurry after the scavenging.

[0009] As a preferred technical solution of the present invention, the lower layer pulp after concentration and the upper layer foam after scavenging are subjected to roughing again.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The combined treatment process of gravity separation and regrinding based on flotation tailings treatment illustrated in the present invention utilizes height difference gravity flow to a spiral chute for selection, and utilizes a spiral chute and a shaking table to form a gravity separation process. It is not only suitable for gold-containing tailings with good floatability, but also can efficiently recover useful substances such as gold, silver, and sulfur in the flotation tailings at one time to obtain high-quality gold concentrate. It has a high effective recovery rate for flotation tailings and can significantly improve the recovery efficiency.

[0011] First of all, this process can effectively improve the resource recovery rate; flotation tailings still contain a certain amount of useful minerals. Through gravity separation, coarse particles of useful minerals can be recovered in advance. After re-grinding, the intergrowth can be further dissociated, so that the wrapped useful minerals can be exposed and sorted and recovered again to avoid waste of resources. Secondly, this process has good adaptability. It can play a certain role in different types of flotation tailings, such as non-ferrous metal tailings and ferrous metal tailings. By adjusting the parameters of gravity separation equipment and the fineness of re-grinding, it can adapt to tailings with a variety of mineral compositions and embedded characteristics.

[0012] From an economic point of view: gravity separation equipment usually has the characteristics of low cost and low energy consumption, and can recover some minerals at low cost in the early gravity separation stage. Although regrinding will incur certain costs, overall, compared with some other complex treatment processes, the comprehensive cost of this combined process is relatively reasonable and increases the total recovery value of minerals. In terms of environmental protection: the reprocessing of flotation tailings can reduce the pressure on tailings storage and reduce the potential pollution risk of heavy metals and other harmful substances in the tailings pond to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See also Figure 1 The present invention provides a technical solution: a combined treatment process of gravity separation and regrinding based on flotation tailings treatment, comprising the following steps: S1. The flotation tailings flow by gravity to the spiral chute for separation. The chute tailings (gold grade 0.09g / t) are discharged into the tailings pond, and the concentrate (gold grade 0.6g / t) from the chute enters the 6-S shaking table for separation. S2. After separation on the 6-S shaking table, the shaking table tailings (gold grade 0.09g / t) are discharged into the tailings pond, and the concentrate (gold grade 3g / t) from the shaking table is fed into the Ai sand mill by a slurry pump for grinding and classification; after grinding, the -200 mesh fineness accounts for more than 75%, ensuring that the minerals are fully dissociated, and then enter the flotation for separation; S3, sand mill grinding and classification followed by flotation.

[0016] Furthermore, depressants such as lime and butyl xanthate collectors are added during the flotation process.

[0017] Furthermore, flotation includes roughing, scavenging and concentrating, specifically: roughing the products after grinding and classification by the sand mill, concentrating the upper foam after roughing, and obtaining the concentrate (gold grade of about 40g / t) after processing the upper foam after concentrating; scavenging the lower pulp after roughing, and obtaining the tailings formed by the lower pulp after scavenging; and re-roughing the lower pulp after concentrating and the upper foam after scavenging.

[0018] The flotation tailings treatment process adopted in the present invention can utilize the height difference to flow to the spiral chute for selection, and utilize the spiral chute and the shaking table to form a gravity separation process; the sand mill itself can grind and classify, and can replace the existing ball mill and classifier combination on the market, thereby reducing the floor space and increasing the processing capacity, thereby improving production efficiency; after grinding, flotation is carried out to select higher-grade concentrate and sell it directly to the smelter; this process method is not only suitable for gold-containing tailings with good floatability, but also through comprehensive optimization and process adjustment, it can significantly improve the recovery efficiency and obtain high-quality gold concentrate.

[0019] The present invention adopts a combined process, consumes less kinetic energy, occupies less space, and uses only an abrasive mill for grinding, thereby reducing the number of traditional grading equipment. The process is suitable for most sulfur-containing ores and can effectively recover gold or other precious metals lost in flotation tailings.

[0020] The gravity separation and regrinding combined treatment process based on flotation tailings treatment utilizes height difference gravity flow to the spiral chute for selection, and utilizes the spiral chute and shaking table to form a gravity separation process. It is not only suitable for gold-containing tailings with good floatability, but also through comprehensive optimization and process adjustment, it can efficiently recover useful substances such as gold, silver, and sulfur in the flotation tailings in one go to obtain high-quality gold concentrate. It has a high effective recovery rate for flotation tailings and can significantly improve the recovery efficiency.

[0021] The undisclosed parts in the present invention are all prior art, and their specific structures, materials and working principles are not described in detail. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A combined treatment process of gravity separation and regrinding based on flotation tailings treatment, characterized in that: The following steps are involved: S1, flotation tailings flow to the spiral chute for sorting, the chute tailings are discharged into the tailings pond, and the concentrate in the chute enters the 6-S shaking table for sorting; S2. After being sorted by the 6-S shaking table, the shaking table tailings are discharged into the tailings pond, and the concentrate from the shaking table is fed into the Ai sand mill by a slurry pump for grinding and classification; S3, sand mill grinding and classification followed by flotation.

2. The combined treatment process of gravity separation and regrinding based on flotation tailings treatment according to claim 1 is characterized in that: In S3, depressants such as lime and butyl xanthate collector are added during the flotation process.

3. The combined treatment process of gravity separation and regrinding based on flotation tailings treatment according to claim 2 is characterized in that: In S3, flotation includes roughing, scavenging and concentrating, specifically: roughing the product after grinding and classification in the sand mill, concentrating the upper foam after roughing, and obtaining the concentrate after processing the upper foam after concentrating; scavenging the lower layer of slurry after roughing, and obtaining the tailings formed by the lower layer of slurry after scavenging.

4. The combined treatment process of gravity separation and regrinding based on flotation tailings treatment according to claim 3 is characterized in that: The lower layer pulp after selection and the upper layer foam after scavenging are re-roughly selected.

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