Ore dressing plant sampling can be divided into two categories, namely static heap sampling data sampling and flow of materials. According to the different sampling, the sampling methods are not the same, of static materials generally used manual sampling, the frequent detection of material flow in mechanical sampling.

Sampling of stationary piles

The static stack is divided into two kinds of bulk materials and fine grinding materials.

1, static sampling

Bulk material pile generally refers to ore heap or dump, in the production process gradually formed, on the properties of the material in the material heap a long, wide, depth direction changes, and block degree, sampling is difficult, general available digging wells were sampled.

(1) digging sampling method is in material pile surface in a certain place digging sampling. When sampling to consider the sampling density, while also considering the sampling amount of each point, the material composition along the stacking thickness distribution uniformity factors. These on behalf of the specimen was affected. If the stockpile is along the length direction gradually accumulation, as long as a reasonable layout of sampling points can be relatively easy to obtain a representative sample. If the stockpile is stacked along the thickness direction, the material composition along the thickness direction of the big dig take rule difficult to obtain a representative a sample. At that time, consider the exploration sampling.

(2) prospecting method and sampling is piled on the material of a certain place mining shallow wells, from the dredged material shrinkage ceded a portion of the material as a sample, it and deposit sampling in the shallow well sampling method is similar. Due to material is loose, sampling but also the supporting shaft, the workload is very big, and high cost.

2. Sampling of fine grinding materials.

The most common is the old tailings pile sampling are generally with drilling and sampling, can use mechanical drilling, drill, or with ordinary steel pipe manual drilling and sampling. In order to ensure the representativeness of the sample, considering the sampling density, generally in the whole tail mine surface evenly spaced sample points, sampling along the depth of drilling.

Two, sampling of flow materials

The so-called material flow, is refers to the transport of materials, including small car transport ore, belt conveyor and other transport equipment of dry ore, to pulp mill and chute material flow and flow.

In general, the sampling of the material flow is horizontal intercept method, namely at regular intervals, vertical in the direction of the material the interception of a small amount of material as a small sample, then the various small samples accumulated as the total sample. Sampling to consider the material flow changes and the interception of the frequency for the representative samples. Sampling of material flow, specifically for the following:

1, sampling

This sampling method is applied to raw ore is transported by the small car to the concentrator. Generally every six cars, car 10 or 20 cars of extracting ore car as a sample, interval size depends on the sampling period to mine the total number of cars. In order to ensure the representativeness of the sample. The pumping of total number of vehicles can not too little, otherwise it will enable represents the specimen under. If pumping car income of the sample size is too large, heap available cone four reduction, or is in transit by pumping the shovel method, namely every few shovel selected a shovel shrinkage method.

The ore car pulling sample, its essence is the sampling of the deposit can be as smoke car just a method. A sample representative to consider to transport the ore itself of the deposit is representative. Therefore, prior to discussions with the mine geological department.

Sampling of the workload is also large, generally only in the plant can not be stored in a special mine can store the object to be sampled, had to use a sampling of the pump.

2, sampling on belt conveyor

In the mineral processing plant for loose material, such as raw ore in belt conveyer sampling. Common manual sampling is in a certain length, at regular intervals, vertical in the material flow direction, along the material layer the whole width and full thickness scraping material as a sample, scraping time interval for 15 minutes to 30 minutes.

3, slurry sampling

The ore pulp sampling (including general classifier overflow), concentrate, tailings and intermediate products. The factory production by class with automatic sampling machine, used for chemical analysis. If artificial sampling, sampling pot or sampling scoop and other tools, sampling to the material flow of full thickness and full width interception samples the sampling points should be selected in the pulp transport, such as overflow weir, chute mouth, pipe mouth. Instead of directly in the chute, pipes or containers should be sampling. When sampling port along the length direction sampling scoop material flow, so as to ensure the material flow in the whole thickness (depth) of the material can be intercepted. The spoon is perpendicular to the direction of flow uniform reciprocating interception of several times, in order to ensure the material flow in the entire width of the material can be uniformly intercepted. Each time interval of sampling is usually 15-30 minutes. If the sample is used for processing test. The total sampling time shall not be less than one class . if we include fluctuations in three classes, the total time shall not be less than three classes. If the material to be oxidized after will affect the test, appropriate to shorten the sampling time. For example, easy to oxidation of sulfide mineral flotation test. Pulp test is not as a long-term research project of the specimen, in the factory laboratory to examine production by slurry test, only with with the check test, and can only be wet reduction, not by drying the sample.

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# Sampling method for stationary material pile, flow material

Data：2016-7-11 10:07:50

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