Mineral recovery rate and metal balance

The metal balance meter is divided into a theoretical metal table and an actual metal balance table :

Theoretical balance sheet metal grade is calculated based on the period of the original ore and the balance of the final mineral product (concentrate and tailings) obtained by the laboratory and the metal fine mineral recovery rate, because the process is not considered lost, so This recovery is called theoretical recovery and this metal balance is called the theoretical metal balance. It can reflect the high technical indicators of the beneficiation process. It is usually prepared by class, day, day, month, season and year. It can be used as business evaluation and analysis data for the beneficiation process and can be based on the work indicators during the balance sheet period. Compare the work of individual workshops, sections and classes.

Actual metal balance sheet . It is based on the actual quantity of ore processed during the balance sheet period, the actual quantity of concentrate (such as the quantity of the factory and the quantity left in the mine bin, thickener and various equipment) and the grade of the concentrate and metal recovery calculated from the test grade. Rate, so this recovery is called the actual metal recovery. This metal balance is called the actual metal balance. It reflects the effectiveness of the actual work of the concentrator. Generally, the actual metal balance sheet is prepared on a monthly, quarterly, semi-annual or one-year basis.

The concentration of metal loss during the beneficiation process is reflected in the difference between the actual recovery rate and the theoretical recovery rate. Since the theoretical balance table does not consider the mechanical loss of metals in various stages of the beneficiation process. Therefore, the metal recovery rate of the theoretical balance meter is generally higher than the metal recovery rate of the actual balance meter, but sometimes anomalous phenomenon occurs, and the actual recovery rate is higher than the theoretical recovery rate, mainly because of sampling error, ore and mineral processing products. The chemical analysis and the error in the determination of moisture content, as well as the error in the measurement of raw ore and mineral processing products. Generally, the difference between the recovery rate of the theoretical metal balance meter and the recovery rate of the actual metal balance meter is not more than 2% for the flotation plant, and no negative difference should occur. The positive and negative balance of the re-election plant should not exceed 1.5%.

Comparing the theoretical metal balance table with the actual metal balance table, it can reveal the loss of metal during the production process. The greater the difference, the more problems exist in the technical management and production management of the plant. This will identify the abnormal conditions of the production process, as well as the sampling, measurement and various analysis and measurement errors, and solve them in a timely manner.

Its calculation method is as follows:

Copper sulfide ores, such as a grade of 0.9% copper, the copper concentrate grade of 18.0%, if the original ore weight per day and night for the treatment 400T, concentrate to give a weight of 15T, actual recovery of ×100%=75%.

Raw ore grade α, concentrate grade β and tailings grade θ (unit: %)

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. There is a balance between the metal content in the raw ore and the metal content in the finished concentrate and tailings. If it is listed in tabular form, it is called a metal balance meter.

Q--Original ore/ton

Alpha - ore grade /%

Θ--tailing grade/%

β - concentrate grade /%

K--concentrate weight / ton

V--metal grade of tailings /%

Ss - the weight of the lost part / ton

Θs--the metal grade/% of the lost part

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