Beneficiation plant sample can be divided into two categories, i.e., flowable materials sampling and sampling the stationary material. For stationary materials, manual sampling is generally used, and mechanical sampling is often used for frequently detected flowing materials.

1. Sampling of static material piles

The static material pile is divided into two types: a block material pile and a fine grinding material pile.

1. Sampling of bulk stock

The ore heap and waste rock are gradually formed in the production. The properties of the material change in the three directions of length, width and height. Moreover, the material size is large, and the sampling work is troublesome. The commonly used methods include the extraction method and the exploration method.

1) Capture method

A plurality of sampling points are uniformly designed along the length and width directions of the surface of the pile, and pit samples are taken. The ore samples taken out are mixed and a part is taken as a sample. The sampling should take into account the density of the sampling points, the sampling depth of each sample and the sampling amount of each sampling point. These are all related to the representativeness of the sample.

2) Exploration method

The shallow well sampling is performed on the sampling points of the surface design of the pile. The sample taken is shredded into the desired sample. This sampling method is used for loose materials, the well wall must be supported, sampling is difficult, and the sampling point in the longitudinal direction should not be too much. Therefore, the sample taken by this sampling method is representatively strong in the depth direction and insufficiently representative in the length direction. .

2. Sampling of finely ground material piles

1) Concentrate heap sampling

Generally refers to the sampling of concentrates in concentrate bins and concentrates that have been loaded into cars or trains. The density of the sampling points and the uniformity of the distribution point all affect the representativeness of the sample. Excessive sampling points can cause difficulties in sampling processing. The number of sampling points is based on the experience list as follows for reference, but generally no less than 4 sampling points.

Number of concentrate sampling points and sample weight

Car or train loading weight (tons) 4 8 12 40 60

Sampling weight per vehicle (g) 40 80 120 400 600

Number of sampling points per car (6) 6 9 12 21~24 30~36

Sampling of concentrates, sampling of commonly used probes, the probes should be of sufficient length to achieve the required depth during sampling. The main point of the sampling of the probe is that the sampling points should be evenly distributed, and the amount of samples taken out of each tube is basically equal, and both the surface layer and the bottom layer can be taken.

2) tailings pile sampling

The sampling of the tailings pile is generally evenly distributed on the surface of the tailings pile. The whole deep hole is sampled and can be sampled by artificial drilling or by mechanical drilling. The tailings pile has a large area and many sampling points. The sample taken out should be uniformly shrunk, and a sample of appropriate weight is taken as a sample.

Second, the sampling of flowing materials

The flow material is divided into two categories: dry ore and slurry. A common sampling method is the full-section cross-section ore flow method. Each time interval is taken once, then accumulated and mixed, and a part of the sample is divided and divided into chemical analysis samples and samples satisfying other measurement requirements.

1. Moving material - sampling on the belt conveyor

Sampling prior to grinding is typically performed on a belt. The sampling method is to stop or operate the belt conveyor, and use a wooden board of a certain length (preferably 1 meter or 0.5 meter) to move the vertical material in the direction of movement, and scrape all the materials on the belt and the same length of the wooden board into the container. The number of samplings is determined by the purpose and weight of the sampling, and is generally taken every 15 to 30 minutes. The weight must be no less than the amount calculated according to the sampling experience formula; if it is greater than the calculated minimum weight, it can be further processed or reduced according to the required amount.

2. Sampling of flowing pulp

Sampling of the slurry includes raw ore (generally with classifier overflow), concentrate, tailings and intermediate products. On-site production of multi-purpose automatic sampling machine to take samples for chemical analysis or other identification.

Manual sampling When sampling with tools such as sampling pots or sampling spoons, full-section cross-section ore flow sampling is required. The sampling points should be selected at the pulp drop and should not be sampled directly in the chute, pipeline or reservoir. When sampling, the length of the sampling spoon is perpendicular to the liquid flow, and the ore flow is intercepted at a constant speed; after several times of reciprocation, the extracted ore sample is poured into a special container, and the sampling interval is generally 15 to 30 minutes. The amount of sample required for sampling is different, so the total sampling time will be different.

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