Mineral refers to the percentage recovery of metal selected from iron ore metal ore metal content of processing amount. It reflects the degree of metal recovery during the beneficiation process. The ore dressing metal recovery rate calculates the actual recovery rate and the theoretical recovery rate respectively. The calculation formula is: actual metal recovery rate (%) = iron concentrate amount (ton) × iron concentrate grade (%) × 100% treated raw ore (ton) × treated ore grade = [iron concentrate amount (ton) × iron concentrate grade (%)】÷[Treatment of raw ore (ton) × treatment of original ore grade] ×100% Theoretical metal recovery rate (%) = iron concentrate grade (%) × (treatment of raw ore grade (%) a tailings grade (%) ×100% treated ore grade (%) × (iron concentrate grade (%) - tailings grade (%)) = [iron concentrate grade (%) × (treated raw ore grade (%) a tailings grade (%) )】÷[Treatment of raw ore grade (%) × (iron concentrate grade (%) a tailings grade (%))] ×100% Calculation explanation: (1) The actual metal recovery rate is the percentage of the actual recovered metal in the beneficiation process; the theoretical metal recovery rate is used to verify the accuracy of the actual recovery rate, and to check the level of production technology management level, both relationship: actual metal recovery = recovery of a metal processing machinery theoretical loss under normal circumstances, is always greater than the actual metal recovery theoretical metal recovery, i.e., the mechanical loss rate is always positive. If the mechanical loss rate is too large or negative, it means that there are inaccuracies in measurement, sampling, laboratory, etc., and should be checked and improved in time. (2) In order to facilitate the comprehensive summary, the theoretical term of the metal recovery rate is the amount of ore metal, which is the theoretical concentrate metal amount, which is derived from the product of the theoretical metal recovery rate and the original ore metal amount. (3) The amount of iron concentrate is calculated as the dry amount after deducting moisture. (4) For the rough selection process by magnetic pulley and heavy medium before entering the grinding machine, the actual recovery rate can be multiplied by the following segmental metal recovery rate, and then the selected recovery rate is used. The number reverses the parent figure number. The formula for calculating the fractional metal recovery rate is: rough metal recovery rate (%) = The amount of ore selected (ton × selected ore iron grade (%) × 100% treated raw ore (ton) × treated ore containing iron grade (%) = [selected ore amount (ton) × selected ore iron grade (%)】÷[Treatment of raw ore (ton) × treatment of ore grade (%)] 】 ×100% Selected actual metal recovery rate (%) = iron concentrate production (ton) × iron concentrate iron grade (%) × 100% grinding ore amount (ton) × iron ore content (%) = [iron Concentrate production (ton) × iron concentrate grade (%)】÷[Ingredient ore (ton) × iron ore grade (%)] ×100% The grade of the ore to be ground should be consistent with the grade of ore selected by rough selection (simple selection), which is obtained from the weighted average of the sampling tests. When the ore is selected for rough grinding, the amount of ore to be ground and the amount of ore selected by rough selection should also be the same. (5) Where there are two or more mineral processing products, the calculation of the theoretical metal recovery rate shall be calculated from the ore according to the determinant method. The formula is the theoretical metal recovery of the first product (∑A): ∑A = a1[(aa 3 )(b 2 -b 3 )-(a 2 -a 3 )(bb 3 )] ×100% a [(a 1 -a 3 )(b 2 -b 3 )-(a 2 -a 3 )(b1-b 3 )] Theoretical product metal recovery of the second product (∑B): ∑B = b2[(a 1 - a 3 )(bb 3 )-(aa 3 )(b 1 -b 3 )] ×100% b[(a 1 -a 3 )(b 2 -b 3 )]-(a 2 -a 3 ) (b 1 -b 3 ) The calculation formula symbol is shown in Table 2-2-1. Table 2-2-1 Product Theory Identical Recovery Rate Calculation Formula Symbol
| species | Mineral volume (tons) | Iron grade (%) | |
| A | B | ||
| Raw ore | 1 | A | b |
| The first concentrate A | C1 | A 1 | B 1 |
| Second concentrate B | C2 | A 2 | B2 |
| Tailings | C3 | A3 | B3 |
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