Determination of the minimum required weight of the sample and the type of sample

  Q=Kd ²

In the middle    Q - the minimum weight necessary to ensure the representativeness of the sample, kg;

       d —— the particle size of the largest nugget in the sample, in millimeters;

       Α——the coefficient representing the characteristic relationship between Q and d ;

       K - the coefficient of experience, related to the nature of the ore.

The α value should theoretically be 3 , and the actual value range should be 1 to 3. When the particle size is large, α is 3 , the calculated sample weight is large, and the labor and financial resources are so much, so the process is commonly used. The alpha value is 2 .

The factors that determine the size of K are:

1. The uniform distribution of useful minerals in the ore. The more uneven the distribution, the larger the K value.

2. The inlay size of useful minerals in the ore. The coarser the inlay size, the larger the K value.

3. The higher the useful mineral content in the ore, the larger the K value.

4. The greater the density of useful minerals, the greater the K value.

Fe, Mn, of minerals in the ore is generally higher, relatively uniform distribution, so the K value is typically 0.1 to 0.2; tungsten, tin, copper, lead, molybdenum, zinc, and other nonferrous metals useful minerals deposits generally not high grade And most of the distribution is uniform, so K = 0.1 ~ 0.5 ; the gold grade in the gold deposit is generally low and unevenly distributed, so generally K = 0.2 ~ 1 . Gold particles < 0.1 mm When K = 0.2 ; 0.1 ~ 0 .6 mm When K=0.4 ; > 0.6 mm When K = 0.8 ~ 1 .

If the sampling method is correct, the coefficient selection is reasonable, and the minimum weight of the sample calculated according to the empirical formula is representative of the properties of the whole material. The amount of sample for chemical analysis is generally a few grams to 1 kg The amount of sample for the ore dressing test needs to be from kilograms to several tons.

The type of sample can be divided into:

1. Experimental study sample    Before the design of the ore dressing plant, the ore selectivity study should be carried out, and the reasonable process flow and reliable mineral processing technology indicators should be proposed to provide design basis for the concentrator; in the production process of the concentrator, it is also possible to carry out this work according to the needs, and propose to expand or rebuild. The plan of the concentrator; in addition to the new equipment for mineral processing, the research of new pharmacy, also needs to be sampled for experimental research.

2. Chemical analysis sample    The production process includes samples obtained from the chemical analysis of the original, fine and tailings, as well as the process of the ore dressing process, the calculation of the amount of metal in the work, the metal loss check, and the chemical analysis of the finished concentrate. All samples are called chemical analysis.

3. Ore size measurement sample    Samples required for the determination of crushed ore products, screening efficiency, graded overflow fineness, classification efficiency, and grinding technology efficiency.

4. Mineral concentration sample    Samples required to determine the concentration of the slurry, such as mill discharge, graded return sand, staged overflow, concentration machine grit, etc., are used to determine the concentration of the slurry.

5. Water sample    For example, samples obtained by measuring the water content of raw ore and concentrate.

6. Mirror phase analysis    For example, the structure of the ore, the size of the embedded mineral of the useful mineral, the monomer dissociation degree of the grinding product, the monomer recovery in the fine tailings, and the loss of the continuum are studied.

During the production process of the ore dressing plant, a certain product can be sampled at one time, and then divided into several different small samples according to the different needs mentioned above, and separately determined and analyzed.