The representativeness of the sample is the key to determining the value of the sampling (test) work. The so-called representative, in short, the sample should have all the characteristics of the original material. For example, sampling a deposit to conduct a beneficiation test study provides a design basis for the establishment of a concentrator for the deposit, which requires the sample to represent all the characteristics of the ore being studied, specifically including the following:

(1) Chemical composition This means that the sample includes the type, average grade and grade change characteristics of the chemical composition contained. Now give an example of the problem of grade change characteristics. Assuming that the average grade of a deposit is 1%, there are two possible cases: one is that the grade of each section of the deposit does not change much, for example, most fluctuation ranges from 0.8% to 1.2%; Another possibility is that the quality of each segment varies greatly, sometimes as low as 0.2% to 0.3%, and as high as 2% to 3%. The average grade for both cases may be 1%. This requires sampling to reflect the grade characteristics of the deposit.

(2) Mineral composition, structural structure and embedding characteristics The ore has many mineral components, and only the main minerals can be requested when sampling. For example, the degree of oxidation of ore have a significant impact on many optional metal ores, so the sampling of oxide ores to the extent requested. Means for non-ferrous oxidation rate, it refers to the ratio of the whole iron ores of ferrous iron. Some ore to determine its difficulty not only with the optional oxidation rate related, such as copper ore, copper oxide content in conjunction with a significant impact on optional, then the oxidation rate and the binding rate to be requested.

Structural structure and embedding properties also have a large impact on the selectivity of the ore, but it is difficult to measure with some simple quantitative indicators, which are generally described in the sampling instructions.

(3) physical properties of ores, chemical properties and physical and chemical properties, including ore hardness, grindability, temperature, degree of mud, particle size composition, density, specific magnetic susceptibility, specific conductivity, dielectric constant, solubility or dissolved salt The content, the pH of the suspension, and the like. For these projects, in actual work, the requirements are requested according to specific needs. For example, the solubility of a useful mineral or the dissolved salt content of a suspension is not important for the re-election process, but is very important for flotation and hydrometallurgy and must be representative.

In addition, for the samples of surrounding rock and stone, it is also necessary to ensure sufficient representation of the above three aspects.

It should be noted that not all beneficiation samples are required to have the above three aspects of representativeness. For example, if the moisture is measured, the sample can represent the moisture of the entire material, that is, the representative of the sample should be required according to actual needs.

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