The primary responsibilities of a flotation operator in a mineral processing plant are: ensuring maximum recovery of valuable minerals and minimizing metal losses as much as possible. ; Ensure that the concentrate quality meets the specified standards. ; Avoid operational errors that could lead to personal injury or equipment safety incidents, and strive to improve equipment availability. ; Reducing reagent consumption continuously lowers beneficiation costs. It is essential to perform frequent operations and adjustments. ; Observe and measure diligently. ; Collaborate and connect between different positions.

　 　I. The Connection Between the Grinding and Ore-Processing Positions

　　Grinding fineness and flotation concentration are crucial process parameters in flotation operations. The grinding fineness must meet the requirement for achieving basic monomeric separation of valuable metallic minerals, and the particle size distribution of the ground ore should be uniform. Both excessively coarse and excessively fine particles can adversely affect the quality of the concentrate. Under current technological conditions, the upper particle size limit for flotation is: metal sulfide ores. 0.15 ~ 0.25 Millimeter, non-metallic sulfide minerals, polar minerals 0.2 ~ 0.3 Millimeter, natural sulfur 0.5 ~ 1.0 Millimeter.

　　Coarse particles, due to their large mass, are less likely to aggregate into bubbles and also exhibit greater detachment forces. Therefore, to float coarser particles, it is necessary to employ certain special measures, such as increasing the aeration rate in the flotation cell to generate larger bubbles. ; Appropriately increase the slurry flow rate and slurry concentration, and employ highly efficient flotation reagents, as larger particles require greater adhesion strength.

　　In the flotation plant, for fine-grained particles. ( Fine mud ) means less than 0.01 Particles in the millimeter range. The presence of fine mud is detrimental to flotation, and during grinding operations, it’s essential to prevent over-grinding as much as possible to avoid mud formation. Since fine mud affects the quality of the concentrate, and given that the mineral mud is extremely fine with a large specific surface area, it tends to adsorb substantial amounts of flotation reagents, thereby reducing the reagent concentration in the slurry. Increasing the dosage of reagents further can compromise the selectivity of the flotation process.

　　Due to the flocculation effect of fine mud, some gangue fine mud and fine mud containing valuable minerals aggregate together to form flocs, which then enter the concentrate and seriously affect its quality. Flotation operators must frequently communicate with grinding operators, keep abreast of changes in the grinding process at all times, and promptly notify the grinding operators to make adjustments as needed according to flotation requirements. This ensures that the grinding fineness and flotation pulp density remain optimal.

　　II. Diligently observe and measure

　　Observing changes in flotation foam is an essential basic skill for flotation operators. During the flotation process, they should pay attention to the size, color, and density of the foam. ( Mineralization degree ) Physical properties such as toughness, brittleness, luster, outline, thickness, fluidity, and acoustics.

　　Foam “ The virtual and the real ” It reflects the amount of mineral particles attached to the bubble surface; generally, the froth in the roughing and cleaning sections is relatively thicker. “ Firm ” The foam in the selected area is relatively... “ Emptiness ” The flotation operator should carefully observe and promptly judge the foam and make timely adjustments.

　　The size of the foam is related to the degree of mineralization: if the foam is too large, it cannot withstand vibration and tends to rupture easily; if the foam is too small, the flotation becomes sticky, making it difficult to ensure a stable grade of concentrate. As for the luster and color of the foam, the stronger the metallic luster of the foam during the flotation of metal sulfide minerals, the better. When metallic luster appears in the tailings, it indicates that the flotation process is abnormal and there are significant losses in the tailings.

　　The thickness of the foam layer is influenced by factors such as the grade of the raw ore selected, the dosage of frother, the pulp concentration, and the properties of the ore itself. Generally, the foam layer is thinner during roughing and scavenging operations and thicker during cleaning operations. In daily production, flotation operators make timely adjustments and controls based on their experience. The sound is generated when the foam is scraped into the foam tank by the scraper. “ Brush, brush ” The louder the sound of the agitation and the swishing, the more useful mineral particles are contained in the froth, indicating a higher grade of concentrate. Flotation operators should pay close attention to these observations regularly.

　　Flotation reagents are an extremely important condition in the flotation process, and the general requirement for reagent addition is that roughing accounts for... 70% , sweep selection occupies 30% The flotation operator must perform and adjust measurements as needed at all times.

　　The general sequence for slurry preparation and chemical addition is: pH Adjusters, inhibitors or activators, collectors, and frothers. Adjusters and inhibitors can be added directly to the ball mill, while inhibitors and activators can be combined and added to the first mixing tank. Collectors and frothers are added either to the mixing tank prior to flotation or directly into the flotation cell.

　　 3. Be diligent in operation and adjustment.

　　During the flotation process, in addition to making appropriate adjustments to reagent dosing based on changes in the foam, it is more common to adjust the rate at which foam is scraped off and to control the flow rate of the slurry. The amount of foam scraped off is mostly regulated by controlling the slurry level. Slurry-level adjustment is typically achieved by controlling the feed rate of ore. To prevent fine foam concentrate from entering the tailings area and to avoid accumulation of slurry within the flotation cell, it is essential to carefully regulate the discharge rate of the slurry and maintain an appropriate slurry level inside the cell, thereby minimizing metal losses in the tailings.

　　When the slurry level in the flotation cell is too low, the cell is not fully utilized, resulting in reduced flotation time and decreased bubble removal. This leads to a higher grade of tailings in the cell, thereby affecting technical performance indicators. On the other hand, when the slurry level is too high, the flotation cell is fully utilized, and bubbles are quickly removed by the skimmer. However, due to the high slurry level, bubbles spend only a short time in the cell, sometimes causing the scraper to scoop up slurry along with the bubbles, leading to overflow of foam or slurry and consequently lowering the quality of the foam concentrate.

　　Generally, during the roughing stage, it is important to scrape off the froth from each cell as promptly as possible to prevent valuable minerals from being lost during the scavenging stage. During the cleaning stage, the froth layer should be thickened to ensure that the concentrate scraped out has higher quality.

　　The daily operations of a flotation operator mainly involve observing the foam condition and adjusting the slurry level in the flotation cell. The adjustment and control of the tailings gate should aim to achieve... “ Stable ” For the main purpose, in most cases, fine-tuning is performed to prevent large fluctuations. Regular observation and measurement of medication dosage are conducted to avoid discontinuation of medication. Necessary adjustments should be made within the allowable range of variation specified in the operating procedures.

　　Observations on the grade of the selected concentrate should be conducted through unscheduled inspections, using the washing method for testing. To prevent mineral slurry from being carried into the froth during skimming, maintain a stable thickness of the froth layer and skim continuously throughout the shift without interruption. Any unusual changes in the concentrate grade should be promptly detected, and the air supply to the flotation machine should be adjusted accordingly to match the required froth-layer thickness.