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Click to add WeChatBecause of its high melting point, boiling point, hardness and density, molybdenum ore is a good conductor of electricity and heat. It is often used in the production of alloy additives, stainless steel, tool steel, heat-resistant steel, etc. According to the excellent natural floatability of molybdenum ore, flotation can be selected for treatment. With the continuous development of mineral processing technology, the production scale of the beneficiation plant has been continuously expanded, which has promoted the continuous development of flotation technology and equipment. The following will introduce you to the flotation process of molybdenum ore and commonly used flotation equipment.
When flotating molybdenite, non-polar hydrocarbon oils such as kerosene and diesel are usually used as collectors, and pine oil is used as a frother for flotation. If only a frother is added during flotation, the concentrate can also be floated out.
In general, the molybdenite ore is crushed and ground to a suitable particle size, and qualified molybdenum concentrate can be obtained after roughing and several times of fine selection. However, molybdenite is relatively soft, and it is easy to adhere to the surface of gangue mineral particles during the grinding process, which is easy to cause over-crushing. In addition, with the good natural floatability of molybdenite, even if the particle size reaches 0.6mm, as long as 1% of molybdenite is exposed on the surface, it can float smoothly, which easily causes gangue minerals to enter the concentrate and affect the quality of the concentrate. Therefore, molybdenum ore beneficiation often adopts the process of rough grinding and rough selection. The rough concentrate produced by rough selection will return to the grinding system for re-grinding, so that it can be fully dissociated and then be selected, that is, the process of stage grinding and stage selection is adopted.
According to the working principle, flotation equipment can be roughly divided into three categories: mechanical flotation equipment, flotation column and reactor/separator flotation equipment. Mechanical flotation equipment is equipped with a stirrer, while flotation columns are flotation equipment without mechanical stirrers.
Mechanical stirring flotation machine can be divided into two types according to the different aeration methods: mechanical stirring self-aspiration type and mechanical stirring aeration type. The difference between these two flotation machines lies in the different aeration methods. The self-aspiration flotation machine uses the negative pressure generated by the rotation of the impeller to suck air into the pipeline, and the air enters the ore pulp after passing through the pipeline, thereby completing the aeration process of flotation. The aeration flotation machine relies on an external fan to supply air for flotation. The disadvantage of the self-aspiration flotation machine compared with the aeration flotation machine is that the aeration volume is insufficient and the flotation efficiency is low.
The basic structure of the flotation column is roughly a cylinder at the top and a cone at the bottom. An aerator is installed at the junction of the cone and the column. The slurry is fed from the top, and the air enters the aerator through the annular wind chamber and the inflation duct. The bubbles entering the slurry from the aerator are evenly diffused along the entire cross-section of the column, and slowly float upward through the downward flowing slurry. In this convection process, the particles collide and contact with the bubbles, so that the bubbles selectively adhere to the particles. After the particle-carrying bubbles float to the liquid surface, they gather into a foam layer, overflow or scrape out to obtain hydrophobic products, and the hydrophilic particles are discharged from the bottom of the column together with the slurry.
The characteristics of the flotation column sorting process are:
① Since the air is fed in by an external compressor and passes through the aerator, it can ensure that a sufficient amount of air enters the slurry and the bubbles can be evenly dispersed.
②The operation control of the flotation column is achieved by regulating the amount of air, so the amount of air has a great influence on the operation of the flotation column.
③The aerator is a key component of the flotation column, which directly affects the amount of air, the degree of dispersion of bubbles and the working efficiency of the flotation column.
Compared with traditional flotation machines, flotation columns have the following advantages:
①Easy to control the thickness of the foam layer, bubble size, and number of bubbles, and the flotation process is simple;
②Generally, it takes 8-12 times to use a flotation machine for molybdenum selection, while it only takes about 3 times to use a flotation column;
③The dynamic collision between bubbles and ore particles and the static separation of bubble-particle combinations in the flotation column are better, which is conducive to the selection of fine or micro-fine molybdenum ores;
④ The flotation column is easy to realize automatic control, so it is more suitable for the selection of molybdenum ore.
At present, the flotation equipment of molybdenum ore beneficiation plants is still mainly mechanical stirring flotation machines. In the roughing and scavenging parts, the aeration mechanical stirring flotation machine is mainly used, and in the selection part, the self-aspiration mechanical stirring flotation machine is mainly used. Some large-scale beneficiation plants have begun to successfully apply flotation columns to industrial production and have achieved good technical and economic indicators. Flotation columns are more suitable for use in the selection part, which can effectively improve the grade of molybdenum concentrate and metal recovery rate.
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