In the beneficiation process, the percentage of the weight of a product obtained and the weight of the ore is referred to as the yield of the product. The yield of each product is calculated as follows: Concentrate yield γ1=Q1/Q×100% Medium mine yield γ2=Q2/Q×100% Tailings yield γ3=Q3/Q×100% Where Q is the weight of the ore, t; Q1 - the weight of the concentrate, t Q2 - medium mine weight, t; Q3 - tailings weight, t. For example, if a ore dressing plant treats the ore weight to 500t per day and night, and obtains a concentrate weight of 30t, the concentrate yield is: γ1=30/500×100%=6%. The tailings yield is γ3 = (500-30) / 500 x 100% = 94%. In the ore dressing production, in addition to the selected ore, the weight of the ore can be known through belt scales or other measuring instruments, and direct measurement of concentrate is difficult. The ore dressing plant generally obtains the ore grade, concentrate grade and tailing grade by sampling and testing, and uses these data to calculate the concentrate yield. Its calculation formula is as follows: Concentrate yield γ = (original grade - tailing grade) / (concentrate grade - tailing grade) × 100% 2. What is the recovery rate? It refers to the percentage recovery rates of the number of the number of metal concentrate (useful components) with the metal ore (useful components) of. This is an important beneficiation index, which reflects the degree of metal recovery, the level of mineral processing technology and the quality of mineral processing. The ore dressing process should maximize the recovery rate of the ore dressing while ensuring the grade of the concentrate. Its calculation method is as follows: If a copper sulfide ore, copper ore grade of 0.9%, copper concentrate grade of 18.0%, if the original ore weight per day and night for the treatment 400T, 15T obtained concentrate weight, Then the actual recovery rate is (15*18%) / (400 * 0.9%) × 100% = 75%. Theoretical recovery = (yield * concentrate grade / ore grade) × 100% In the production process, each production class needs to sample and test the original ore grade α, concentrate grade β and tailings grade. At this time, the theoretical recovery rate can be calculated from the above formula. The mineral processing technical supervision department generally prepares the actual metal balance table through the calculation of the actual recovery rate. The theoretical metal balance table is compiled by the calculation of the theoretical recovery rate. The comparative analysis of the two can reveal the mechanical losses in the beneficiation process, identify the abnormal conditions in the ore dressing work and the errors in sampling, measurement, analysis and measurement. Generally, the theoretical recovery rate is higher than the actual recovery rate, but the two cannot be too different. Generally, the loss in a single metal flotation plant is not allowed to differ by 1%. If this number is exceeded, it indicates that the metal loss is serious during the beneficiation process. 3. What is the dressing ratio? The beneficiation ratio refers to the number of raw ore required for each 1t concentrate. Usually expressed in multiples. Its calculation formula is as follows: Dressing ratio = raw ore processing capacity (t) / concentrate quantity (t) (times) For example, if a ore dressing plant treats the raw ore weight for 500t every day and night, and obtains the concentrate weight of 30t, the ore dressing ratio is 500/3=16.7. 4. What is the rich ratio? The rich ore ratio is the ratio of the grade of the useful mineral in the concentrate to the grade of the useful mineral in the ore, ie the concentrate grade is several times the grade of the original ore. The higher the ore ratio and recovery rate, the better the beneficiation efficiency. The formula for calculating the rich ratio is as follows: Rich ore ratio = concentrate grade / ore grade (times) The rich ore ratio is sometimes called the enrichment ratio and is usually expressed by i. For example, if the grade of copper in the ore of a concentrator is 1.0% and the grade of copper in the concentrate is 15.0%, the ratio of rich ore is i=15.0%/1.0%=15. 5. What is the amount of raw ore processing? The raw ore treatment volume refers to the quantity of raw ore that enters the plant for treatment. The concentrating plant measures the amount of raw ore processing, and commonly uses mechanical belt scales and electronic belt scales. Some factories use a scraper to scrape a certain amount of ore on the belt scale at a time, and carry out weighing calculation. Some ore dressing plants have pre-selection, washing and de-slipping processes before sorting. Therefore, when calculating the ore processing capacity, the pre-selected amount of waste rock, the amount of qualified ore and the overflow of de-sludge should be included. 6. What is the date of the beneficiation? The average amount of raw ore processed by each beneficiation working day is called the daily processing capacity of the beneficiation. It is an indicator reflecting the processing capacity of the plant. Its calculation formula is: Day of processing of ore dressing (t/d) = amount of ore processing (t) / number of days of processing (t) 7. What is the physical labor productivity of all the staff in the factory? The physical labor productivity of all the staff in the plant selection refers to the average amount of raw ore processed by each employee of the mineral processing plant during the reporting period. It is a comprehensive indicator reflecting the degree of equipment and labor efficiency of mineral processing machinery. Its calculation method is as follows: Labor productivity of all selected factories t/person•month (or season, year) = raw ore processing capacity (t) / number of employees in the plant 8. What is the physical labor productivity of the mineral processing workers? The physical labor productivity of mineral processing workers refers to the amount of raw ore that each production worker has processed during the reporting period. It is a comprehensive indicator reflecting the equipment level of the concentrator and the labor productivity of the ore dressing workers. Its calculation method is as follows: Plant worker physical labor productivity t/person•month (or season, year)=original ore processing capacity (t)/number of workers in the factory 9. How is the size of the concentrator divided? The size of the ore dressing plant is generally divided according to the amount of raw ore processing. The size of the colored and black beneficiation plants is slightly different. The size and type of the ore dressing are shown in the table below. Table 1 Scale and type of ore dressing plant Hydraulic Busbar Cutting Punching Bending Machine
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1. What is the yield?