(1) Sampling of the static material pile The static material pile is divided into two types: a block material pile and a fine grinding material pile. The sampling block pile of a block stock generally refers to the ore pile or waste rock pile, which is gradually formed during the production process. The nature of the material changes in the length, width and depth of the pile, plus the block degree. Large, sampling is difficult, generally can be sampled by the digging method or the exploratory method. a. The sampling method is to dig a hole at a certain point on the surface of the pile. The sampling network should consider the density of the sampling network, and also consider the factors such as the sampling amount per point and the uniformity of the material composition along the thickness direction of the pile. These have an effect on the representativeness of the sample. If the pile is gradually piled up along the length direction, a representative sample can be obtained relatively easily by arranging the sampling points reasonably. If the pile is stacked in the thickness direction, the material composition varies greatly along the thickness direction, and it is difficult to obtain a representative sample by the excavation method. In this case, the well method should be considered for sampling. b. The well-exploration method is to excavate the shallow well at a certain place in the pile, and a part of the material is shrunk from the excavated material as a sample, which is similar to the shallow well sampling method used for sampling the deposit. Since the material is loose, the well wall is supported during sampling, so the workload is large and the cost is high. 2 Sampling of finely ground material piles The sampling of the most common old tailings piles is generally done by drilling holes, either by mechanical drills or by hand drills or by manual drilling of ordinary steel pipes. In order to ensure the representativeness of the sample, the density of the sampling net should be considered. Generally, sampling points are uniformly arranged on the entire surface of the tailings field, and samples are taken along the full deep hole. . (2) Sampling of flowing materials The so-called flowing materials refer to the materials in the transportation process, including small ore vehicles transporting ore, belt conveyors and other dry minerals, feed streams and chutes, and flowing pulp. In general, the sampling of the flowing materials is carried out by the transverse intercept method, that is, a small amount of material is taken as a small sample perpendicular to the flow direction at regular intervals, and then each small sample is accumulated as a total sample. . Sampling should take into account the compositional changes in the composition of the stream and the frequency of interception. The sampling of flowing materials is specifically divided into the following types. 1 pump sampling This sampling method is suitable for the case where the original ore is transported from a small mine car to a plant. Generally, a certain ore is taken as a sample every 6 cars, 10 cars or 20 cars. The interval depends on the sampling period. The total number of cars in the mine. In order to ensure the representativeness of the sample, the total number of vehicles to be pumped should not be too small, otherwise the representativeness of the sample will be insufficient. If the amount of sample obtained by pumping is too large, it can be reduced by the stacking cone method, or by the shovel method during the transportation process, that is, the shovel method of taking a shovel every several shovel. The sampling of the original mine's pumping is essentially a sampling from the deposit, which can be seen as a method of pumping. Regarding the representativeness of the sample, it is necessary to consider whether the ore itself is representative of the deposit or ore body studied, so it is necessary to discuss with the mine geological department in advance. The workload of sampling by car is also relatively large. Generally, only when a special mine bin is installed in the plant to store the object to be sampled, it is necessary to use the pump to sample. 2 Sampling on a belt conveyor At the concentrator, for loose materials, such as raw ore, more samples are taken on the belt conveyor. The common manual sampling is to take a material along the full width and full thickness of the material layer as a sample at a certain length and perpendicular to the direction of the material flow at a certain time. The scraping interval is 15 minutes or 30 minutes. . 3 Sampling of the slurry of the slurry includes the ore (generally the classifier overflow), concentrate, tailings and intermediate products. On-site production uses an automatic sampler to take samples for chemical analysis. If it is manually sampled, use tools such as sampling pots or sampling rafts. When sampling, the sample should be taken along the full thickness and width of the stream. The sampling points should be selected at the slurry transfer point, such as overflow gully, chute, and pipe mouth, instead of Sampling directly in chutes, pipes or storage containers. When sampling, the length of the sampling nozzle should be followed by the flow, so as to ensure that the entire thickness (depth) of the material can be intercepted, and the sampling enthalpy is cut back and forth several times perpendicularly to the flow direction to ensure the flow. The entire width of the material can be evenly intercepted. The interval between each sampling is generally 15 to 30 minutes. If the sample is for testing, the total sampling time shall not be less than one shift; if the fluctuation of three shifts is considered, the total time shall not be less than three shifts. If the material is oxidized and will affect the test, the sampling time should be shortened appropriately. For example, it is easy to oxidize ore flotation test. The slurry sample can not be used as a sample for long-term research projects. In the field laboratory, the production situation can be examined. When the slurry test is used, it can only be taken with the test, and it can only be wet-reduced. Use dried samples. Beach Flag,Garden Flag,National Flag,Hand Waving Flag SHAOXING CHUANGDONG TOUR ARTICLES CO.,LTD , http://www.flagnshow.com
Sampling of the concentrator and various sampling methods
Beneficiation plant Sampling Sampling Sampling can be divided into two types of material and the flow, i.e. the stationary stacking. Depending on the sampled object, the sampling method is different. Manual sampling is usually used for stationary materials, and mechanical sampling is often used for frequently tested flowing materials.