CN116060215A

CN116060215A - Middling treatment method for improving flotation index

Info

Publication number: CN116060215A
Application number: CN202310174576.9A
Authority: CN
Inventors: 阙朝阳; 吴维新; 欧阳伦熬; 李继福; 梁治安; 岳涛; 魏转花; 黄裕卿; 丛颖
Original assignee: Zijin Mining Group Co Ltd; Xiamen Zijin Mining and Metallurgy Technology Co Ltd
Current assignee: Zijin Mining Group Co Ltd; Xiamen Zijin Mining and Metallurgy Technology Co Ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-05-05

Abstract

The invention discloses a middling treatment method for improving flotation indexes, which comprises the following steps: s1, grinding; s2, grading: the settled sand is returned to the mill for regrinding, and overflowed water enters a stirring barrel for pulp mixing and is then pumped into roughing flotation equipment; s3, floatation: concentrating middlings in the concentrating operation and middlings in the scavenging operation as floating middlings, and feeding the floating middlings into a hydrocyclone to carry out independent grading on middlings; s4, individually grading middlings: and classifying the floating middlings by a hydrocyclone to obtain middling classifying overflow and middling classifying sand, returning the middling classifying sand to the mill for regrinding, and returning the middling classifying overflow to a slurry pump for supplementing water. The invention can prevent fine mud from entering the mill to further mud, can more fully utilize a large amount of water in the independent grading overflow of the middling, greatly reduces the water consumption of the whole mineral separation system, and can better ensure proper flotation concentration. The independent grading sand setting of the middlings is directly returned to the mill for forced ore grinding, which is beneficial to the dissociation of useful minerals in coarse fraction middlings.

Description

Middling treatment method for improving flotation index

Technical Field

The invention relates to the technical field of mineral separation, in particular to a middling treatment method for improving flotation indexes.

Background

In the existing mineral separation production process, raw ore generally contains about 3 percent of water (namely, the raw ore concentration is 97 percent), and is fed into a mill, wherein the grinding operation concentration and the mill ore discharge concentration are about 65-80 percent; feeding ore discharge ore pulp of the mill into a slag pulp pump to supplement water until the concentration of the ore pulp is about 40% -55%; feeding the slurry into classification equipment, wherein the concentration of classification operation is about 40% -55%, and classified overflow and sand return are obtained, and the concentration of the slurry is about 35% -45% and 65% -80% respectively; the classified overflow and the floatation middlings are returned to the stirring barrel for pulp mixing, and the middlings are far lower than the classified overflow, so that the pulp concentration is 25% -40% and then fed to the floatation equipment. The concentration of roughing, selecting and scavenging operations in the flotation operation is about 25% -40%, 15% -25% and 20% -30%, and the concentration of middling ore pulp is about 20% because all foam products in the flotation operation need to be supplemented with water in the flotation process.

At present, the middling ore pulp is mostly returned to the previous flotation operation in a closed cycle mode, and the low-concentration middling ore pulp is only returned to a flotation system, so that the operation concentration of the flotation system can be reduced, and the flotation index is influenced. The useful minerals in the floating middlings often exist in a lean intergrowth form, and if the useful minerals are directly returned to the front-end operation without grinding, the problem of poor mineral enrichment and recovery effects exists.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a middling treatment method for improving flotation indexes

In order to achieve the above purpose, the present invention adopts the following technical scheme:

a middling treatment method for improving flotation indexes comprises the following steps:

s1, grinding: feeding raw ore into a mill for grinding operation, wherein the mass concentration of ore pulp in the grinding operation and the mass concentration of ore pulp in the grinding and discharging are 70%, the ore pulp in the grinding and discharging flows into a pulp pump for supplementing water, the mass concentration of the ore pulp is regulated to 55%, and then the ore pulp is pumped into classification equipment from the pulp pump;

s2, grading: classifying the ore pulp by classifying equipment to obtain settled sand and overflow, returning the settled sand to a mill for regrinding, and pumping the overflow into a stirring barrel for pulp mixing and then into roughing flotation equipment;

s3, floatation: carrying out roughing operation on ore pulp in roughing flotation equipment to obtain a roughing foam product and roughing residual minerals, and carrying out carefully selecting operation on the roughing foam product to obtain carefully selected foam product and carefully selected middlings; the roughing residual minerals enter a scavenging operation to obtain minerals in the scavenging operation and scavenging residual minerals; concentrating middlings in the concentrating operation and middlings in the scavenging operation as floating middlings, and feeding the floating middlings into a hydrocyclone to carry out independent grading on middlings;

s4, individually grading middlings: and (3) classifying the middlings through a hydrocyclone to obtain middling classifying overflow and middling classifying sand, returning the middling classifying sand to the mill in the step S1 for regrinding, and returning the middling classifying overflow to the slurry pump in the step S1 for supplementing water.

Further, in step S2, the mass concentrations of the overflow and the settled sand pulp obtained by classification are 35% and 75%, respectively.

Further, in step S3, the mass concentration of the pulp in the roughing operation is 35%, the mass concentration of the pulp in the concentrating operation is 20%, and the mass concentration of the pulp in the scavenging operation is 30%.

Further, in step S4, the mass concentration of the ore pulp of the individual middling classifying operation is 20%, the mass concentration of the ore pulp of the obtained middling classifying sand setting is 70%, and the mass concentration of the ore pulp of the middling classifying overflow is 10%.

The invention has the beneficial effects that:

(1) According to the invention, fine mud can be prevented from further mud formation in the mill by separately classifying middlings.

(2) In the invention, the separate graded overflow of the middling is returned to the slurry pump in the ore grinding process to be used as the additional water, so that a large amount of water in the separate graded overflow of the middling can be more fully utilized, the water consumption of the whole ore dressing system is greatly reduced, and meanwhile, compared with the conventional return of the middling to the roughing operation or the conventional return to the stirring tank before roughing, the proper flotation concentration can be better ensured.

(3) In the invention, the independent grading sand setting of the middlings is directly returned to the mill for forced ore grinding, which is beneficial to the dissociation of useful minerals in coarse fraction middlings.

Drawings

FIG. 1 is a schematic flow chart of the method of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, and it should be noted that, while the present embodiment provides a detailed implementation and a specific operation process on the premise of the present technical solution, the protection scope of the present invention is not limited to the present embodiment.

Example 1

1.78% of copper in a copper slag raw ore, 38.78% of iron, 0.32% of sulfur, 31.96% of SiO2, 7.27% of Al2O3, 4.82% of CaO and 1.26% of MgO. The copper separating process of the raw slag is to quickly float copper concentrate, and the concentrate is directly returned to the front-end grading sand pump after four scavenging. Because the middling content is large, fineness is thin, concentration is thin, the middling is directly returned to the grinding classification sand pump, fine lean intergrowth minerals cannot enter a grinding machine to be ground again and dissociated, and overflow is directly returned to a flotation system after classification, so that the flotation concentration is easily too low, and the mineral separation index is influenced.

In this example, the raw ore was treated as shown in fig. 1 as follows.

s2, grading: classifying the ore pulp by classifying equipment to obtain settled sand and overflow, returning the settled sand to a mill for regrinding, and pumping the overflow into a stirring barrel for pulp mixing and then into roughing flotation equipment; the mass concentrations of the overflow and the sand setting ore pulp obtained by classification are 35% and 75%, respectively.

S3, floatation: carrying out roughing operation on ore pulp in roughing flotation equipment to obtain a roughing foam product and roughing residual minerals, and carrying out carefully selecting operation on the roughing foam product to obtain carefully selected foam product and carefully selected middlings; and (5) feeding the roughing residual minerals into scavenging operation to obtain minerals in scavenging operation and scavenging residual minerals. In this example, the coarse froth product was subjected to a single refining pass. And (3) carrying out four-section scavenging operation on the roughing residual minerals, wherein the scavenging residual minerals obtained in each section scavenging operation enter the next section scavenging operation, and finally the scavenging residual minerals obtained are tailings.

And concentrating middlings in the concentrating operation and scavenging middlings in the scavenging operation, which are obtained in each section of scavenging operation, as floating middlings, and feeding the floating middlings into a hydrocyclone to separate and classify the middlings. The mass concentration of the ore pulp in the roughing operation is 35%, the mass concentration of the ore pulp in the carefully selecting operation is 20%, and the mass concentration of the ore pulp in the scavenging operation is 30%.

S4, individually grading middlings: and (3) classifying the middlings through a hydrocyclone to obtain middling classifying overflow and middling classifying sand, returning the middling classifying sand to the mill in the step S1 for regrinding, and returning the middling classifying overflow to the slurry pump in the step S1 for supplementing water. The mass concentration of ore pulp of the independent middling classifying operation is 20%, the mass concentration of ore pulp of the obtained middling classifying sand setting is 70%, and the mass concentration of ore pulp of middling classifying overflow is 10%.

The method for treating middling ore has the advantages that the water consumption is greatly reduced, the flotation concentration is improved, the ore with fine fraction difficult to dissociate is directly fed into a mill, effective dissociation is obtained, and the flotation index is improved. The results are shown in Table 1.

TABLE 1

Example 2

Copper is 0.46% of copper in a copper mine raw ore, copper is mainly copper sulfide minerals, main copper minerals are chalcopyrite and bornite, and secondary copper minerals are blue chalcocite, cerulosa, cuprite and the like. The original copper flotation process comprises one roughing, two scavenging, two concentrating and middling sequential return, and the middling is poor in intergrowth, so that the middling pulp concentration is low, the middling sequential return reduces the flotation operation concentration, and the poor intergrowth cannot be effectively dissociated to obtain recovery.

In this example, the raw ore was treated as shown in fig. 1 as follows.

S3, floatation: carrying out roughing operation on ore pulp in roughing flotation equipment to obtain a roughing foam product and roughing residual minerals, and carrying out carefully selecting operation on the roughing foam product to obtain carefully selected foam product and carefully selected middlings; and (5) feeding the roughing residual minerals into scavenging operation to obtain minerals in scavenging operation and scavenging residual minerals.

In this embodiment, the coarse froth product is subjected to two stages of concentrating operations, the froth product of the first stage of concentrating operation is subjected to the next stage of concentrating operation, and the froth product of the second stage of concentrating operation is the final concentrate product. And (3) performing two-section scavenging operation on the scavenging residual minerals, wherein the scavenging residual minerals obtained in the first-section scavenging operation enter the next-section scavenging operation, and the scavenging residual minerals finally obtained in the second-section scavenging operation are tailings.

Middlings in the concentrating operation of each section of concentrating operation and middlings in the scavenging operation of each section of scavenging operation are used as floatation middlings, and the middlings are fed into a hydrocyclone for independent classification. The mass concentration of the ore pulp in the roughing operation is 35%, the mass concentration of the ore pulp in the carefully selecting operation is 20%, and the mass concentration of the ore pulp in the scavenging operation is 30%.

After the ore is treated by the method, the water consumption of a system is greatly reduced, the flotation concentration is improved, after the middlings are classified, the middling coarse fraction containing more lean continuous organisms is directly fed into a mill, the copper minerals are effectively dissociated, and the flotation index is improved. The results are shown in Table 2.

TABLE 2

Various modifications and variations of the present invention will be apparent to those skilled in the art in light of the foregoing teachings and are intended to be included within the scope of the following claims.

Claims

1. The middling treatment method for improving the flotation index is characterized by comprising the following steps of:

2. The method according to claim 1, wherein in step S2, the mass concentrations of the overflow and the settled sand obtained by classification are 35% and 75%, respectively.

3. The method according to claim 1, wherein in step S3, the concentration of the mineral slurry in the rougher operation is 35%, the concentration of the mineral slurry in the cleaner operation is 20%, and the concentration of the mineral slurry in the scavenger operation is 30%.

4. The method according to claim 1, wherein in step S4, the medium ore is classified into a medium ore having a pulp mass concentration of 20%, a medium ore classified sand setting having a pulp mass concentration of 70%, and a medium ore classified overflow having a pulp mass concentration of 10%.