CN110369154B

CN110369154B - Pyrite flotation process method based on carbon dioxide atmosphere

Info

Publication number: CN110369154B
Application number: CN201910695753.1A
Authority: CN
Inventors: 黄霞光; 罗国清; 施卓雄; 卢可可; 邓晓锋; 李杨; 林海
Original assignee: Guangdong Institute Of Mineral Application
Current assignee: Guangdong Institute Of Mineral Application
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2021-07-20
Anticipated expiration: 2039-07-30
Also published as: CN110369154A

Abstract

The invention discloses a pyrite flotation process method based on carbon dioxide atmosphere, wherein a gas sealing cover is arranged in the external space of self-suction flotation equipment to form a flotation sealed cabin, and CO is used for flotation₂A compensation air source is connected into the flotation sealed cabin; the air pressure in the flotation sealed cabin is 1 atmosphere so that the air pressure inside and outside the flotation sealed cabin is the same, and the purity of carbon dioxide is not lower than 98.0 percent; and after grinding the pyrite, performing flotation in the flotation sealed cabin, wherein the using amount of the collecting agent is 100-115 g/t. The invention replaces air with carbon dioxide as the air source and atmosphere of the froth flotation, realizes the reduction of the dosage of the flotation reagent, obviously improves the flotation index of the pyrite, and has important significance for the economic benefit of the ore dressing enterprises and the treatment of environmental pollution.

Description

Pyrite flotation process method based on carbon dioxide atmosphere

Technical Field

The invention relates to the technical field of mineral separation, in particular to a flotation process method of pyrite.

Background

With the rapid development of productivity level and social activities, environmental protection has become a global issue of general attention and importance. How to reduce the pollution and harm to the environment is a main task facing the production of enterprises and the living needs of people.

In the mineral separation production, a large amount of reagents are needed in the flotation process, which causes the problems of air pollution, tailing water pollution and the like, and the usage amount of the reagents not only affects the production cost and the economic benefit of enterprises, but also causes great difficulty and heavy burden on environmental management. Therefore, how to effectively reduce the dosage of the flotation reagent and simultaneously realize the improvement of the beneficiation indexes has important significance for the economic benefit of beneficiation enterprises and the treatment and protection of environmental pollution.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a pyrite flotation process method based on carbon dioxide atmosphere, which uses carbon dioxide to replace air as a gas source and atmosphere of froth flotation, so that the flotation reagent dosage is reduced, and the flotation index of pyrite is obviously improved.

The purpose of the invention is realized by the following technical scheme:

the invention provides a pyrite flotation process method based on carbon dioxide atmosphere, which is characterized in that a gas sealing cover is arranged in the external space of self-suction flotation equipment to form a flotation sealed cabin, and CO is used for flotation₂A compensation air source is connected into the flotation sealed cabin; the air pressure in the flotation sealed cabin is 1 atmosphere so that the air pressure inside and outside the flotation sealed cabin is the same, and the purity of carbon dioxide is not lower than 98.0 percent; and after grinding the pyrite, performing flotation in the flotation sealed cabin, wherein the using amount of the collecting agent is 100-115 g/t.

The invention sucks CO by stirring the ore pulp₂(ii) a CO overflow from the pulp₂And flotation froth breaking of overflowed CO₂And the air is retained in the space in the flotation sealed cabin to realize self circulation. CO 2₂The compensation air source is used for compensating the loss of the carbon dioxide in the flotation sealed chamber, and the loss is generated by small leakage loss of the carbon dioxide in the flotation sealed chamber and pulp dissolution loss.

Further, the CO of the present invention₂The compensating air source is 0.1-0.5 Kg/m of ore pulp flow meter³CO compensation into a flotation sealed cabin₂。

In the scheme, the grinding fineness of-0.074 mm accounts for 75-85%; the flotation adopts a flow of first roughing, second scavenging and second refining, and the flotation time is 13-18 min in a roughing section, 6-10 min in a first scavenging section, 6-10 min in a second scavenging section, 10-15 min in a first refining section and 8-12 min in a second refining section.

In the scheme, the flotation grade of the pyrite is 25-35%; the S grade of the concentrate is more than 48%, and the yield of the concentrate is improved by 2-7%; the recovery rate of the concentrate S is more than 94 percent.

The invention has the following beneficial effects:

(1) the invention carries out pyrite flotation based on carbon dioxide atmosphere and CO₂The gas-liquid interface formed by the gas has weak polarity, which is beneficial to the adsorption of the pyrite mineralized foam surface, and the adsorption is also CO₂The reason why it cannot be substituted by argon or nitrogen. CO 2₂The gas plays a role of a gas source and a role of a catalyst in the flotation operation, so that the flotation of the pyrite is promoted.

(2) CO of the invention₂The gas blocks the oxidation of the collecting agent, so that the use amount of the flotation agent is greatly reduced, the use amount of the collecting agent is reduced by 20-50%, and the problems of air pollution and tailing water pollution of a flotation plant are greatly improved.

(3) CO of the invention₂The oxidation of S on the surface of the pyrite is blocked by the gas, the hydrophobicity of the pyrite is guaranteed not to be damaged, and the finer the granularity is, the more obvious the protection effect is, so that the sulfur content in the tailings is greatly reduced (by 8-55% compared with the traditional technology), and the recovery rate of the concentrate S is remarkably improved (by 0.7-6% compared with the traditional technology). The invention improves the mineral dressing index, and simultaneously, the reduction of the sulfur content of the tailings also plays a role in quality assurance for the utilization of the tailings in the construction market.

(4) The invention uses the impeller of the flotation machine to stir and suck CO₂The method is similar to the ventilation mode of the high-speed railway carriage, the shell of a single carriage is regarded as a flotation sealed cabin, and a plurality of carriages are connected to form a flotation workshop. The existing production line is easy to modify and implement, is convenient to operate, and can improve the flotation effect when the pH value of ore pulp is neutral and the concentration of the ore pulp is 5-55%.

(5) The invention not only reduces the production cost, but also effectively reduces the influence of the pyrite flotation on the environment, thereby reducing the expenditure of environmental protection expenses of enterprises, and having important significance for the economic benefit of ore dressing enterprises and the treatment of environmental pollution.

Drawings

The invention will now be described in further detail with reference to the following examples and the accompanying drawings:

FIG. 1 is a schematic diagram of a flotation capsule configuration according to an embodiment of the invention;

fig. 2 is a flow chart of a flotation process of pyrite according to the embodiment shown in fig. 1.

In the figure: self-suction type flotation equipment 1, a gas sealing cover 2, a flotation sealing cabin 3, CO₂A compensation gas source 4 and a transparent observation window 5

Detailed Description

Fig. 1 and 2 show an example of a pyrite flotation process based on a carbon dioxide atmosphere according to the present invention. As shown in figure 1, a gas sealing cover 2 is arranged in the external space of a self-suction type flotation device 1 (a flotation machine or a flotation column) to form a flotation sealing cabin 3, CO₂A compensation air source 4 is connected into the flotation sealed cabin 3, and a transparent observation window 5 is arranged on the air sealed cover 2 corresponding to the flotation machine 1.

The air pressure in the flotation sealed cabin 3 is 1 atmospheric pressure, so that the air pressure inside and outside the flotation sealed cabin is the same, and the purity of carbon dioxide is not lower than 98.0 percent (can be monitored by an online gas monitor); CO 2₂The compensating gas source 4 adopts liquefied carbon dioxide, a pressure reducing valve and a flow meter are used, and a pulp flow meter is used according to 0.125Kg/m³CO compensation into the flotation sealed chamber 3₂。

And carrying out primary grinding on the pyrite until the grinding fineness is-0.074 mm and accounts for 75-85%, and carrying out flotation in the flotation sealed cabin 3 under the conditions that the concentration of the ore pulp is 30% and the pH of the ore pulp is neutral. The process flow of the flotation process with butyl yellow as a collecting agent is shown in figure 2, and a process of first coarse sweeping and second sweeping is adopted.

The method is characterized in that pyrite flotation samples of Guangdong cloud pyrite, Dabaoshan iron ore and Van's lead-zinc ore are used as the selected samples, the air source is used as the comparative example in the prior art, the medicament dosage of the collecting agent is shown in table 1, and the mineral separation index data is shown in table 2.

Table 1 example of the invention and the amount of collector used for proportional pyrite flotation

Table 2 beneficiation indicators for the inventive examples and for the proportional pyrite flotation

As can be seen from tables 1 and 2, the amount of the collector used in the present example is greatly reduced compared to the comparative example, and the beneficiation index is significantly better than that of the comparative example.

Claims

1. A pyrite flotation process method based on carbon dioxide atmosphere is characterized in that: a gas sealing cover (2) is arranged in the external space of the self-suction type flotation equipment (1) to form a flotation sealing cabin (3), and CO₂A compensation air source (4) is connected into the flotation sealed cabin (3); the air pressure in the flotation sealed cabin (3) is 1 atmosphere so that the air pressure inside and outside the flotation sealed cabin is the same, and the purity of carbon dioxide is not lower than 98.0 percent; the feed grade of the pyrite is 25-35%, the flotation operation is carried out in the flotation sealed cabin (3) after ore grinding, and the CO is used₂The compensating air source (4) is 0.1-0.5 Kg/m of ore pulp flow meter³CO compensation into the flotation sealed cabin (3)₂，CO₂The gas forms a weak-polarity gas-liquid interface to promote the adsorption of the pyrite mineralized foam surface; the flotation operation is carried out under the conditions that the pH value of ore pulp is neutral and the concentration of the ore pulp is 5-55%, the using amount of the collecting agent is 100-115 g/t, the S grade of the ore concentrate is greater than 48%, the yield of the ore concentrate is improved by 2-7%, the recovery rate of the S ore concentrate is greater than 94%, the recovery rate of the S ore concentrate is improved by 0.7-6%, and the sulfur content of tailings is reduced by 8-55%.

2. The pyrite flotation process based on carbon dioxide atmosphere according to claim 1, characterized in that: the grinding fineness is-0.074 mm and accounts for 75-85%; the flotation adopts a flow of first roughing, second scavenging and second refining, and the flotation time is 13-18 min in a roughing section, 6-10 min in a first scavenging section, 6-10 min in a second scavenging section, 10-15 min in a first refining section and 8-12 min in a second refining section.