Experimental study on grinding process

The laboratory should generally perform the following tests and measurements: (1) Determination of work index. If the calculation of the crushing and grinding equipment is carried out according to the Bond formula, the determination of the crushing and grinding work index should be carried out. The measured work index has the following types: coarse, medium and fine crushing work index; self-hardening work index; rod grinding work index; ball grinding work index; and coarse concentrate or medium ore re-grinding index. (2) Determination of the grindability. If the grinding method is used to calculate the grinding equipment, the ore grinding degree of each section of the grinding should be determined. During ore grindability test, the standard required to take core samples for comparative tests, non-ferrous metals mine ore beneficiation plant design and more to Yangjiazhangzi molybdenite ore as the standard, chemical pyrite mine concentrator design when standard Mukaiyama ore pyrite ores, deposited in metamorphic rock phosphate ore Jinping standard phosphate ore, phosphate rock and silicon deposition type calcium phosphate rock when employed in multi-stage grinding Wangji third layer The ore is a standard ore sample, and the ferrous metal ore dressing plant is designed to produce the original ore of the ore dressing as a standard ore sample in a similar grinding process. In view of the often changing nature of the ore mined in the production mine, the standard ore sample should be taken at the same time as the mill processing capacity, technical conditions and relevant technical parameters of the mine at the time of processing the ore. (3) Abrasion index test. The consumption of grinding media and grinding machine liners is a major consumption indicator of the ore dressing plant, so the consumption index should be determined. (4) Self-grinding medium performance test. When the self-grinding process is to be adopted, the self-grinding medium test should be carried out first to determine whether a self-grinding or semi-self-grinding semi-work sub-test or industrial test is required. (5) When studying the grinding process, it should be considered whether it is necessary and possible to wash the mine according to the ore content and the nature of the slime and its influence on the crushing, grinding, sorting and dewatering operations. If it is necessary to wash the mine, it is necessary to carry out the corresponding washing and washing overflow treatment test. (6) Experimental study on ore pre-selection. The ore pre-selection may be carried out before the original ore is ground, depending on the waste rock mixing rate at the time of mining or the need for enrichment of the ore grade. If possible, an ore pre-selection test is required, and a grinding process for pre-selected ore is included in the grinding process test plan. (7) Experimental study of grinding methods and grinding processes. Commonly used grinding methods can be divided into ball milling, rod grinding, self-grinding, semi-self-grinding, gravel grinding, etc. depending on the grinding medium. According to the nature and characteristics of the ore, the relevant experimental data, the similar experience of production and testing, and other factors, the possibility of various grinding methods and the necessity of expanding the test should be analyzed, and one or two of the main ones should be selected and recommended. Single or combined grinding method. On this basis, a grinding process or multi-stage grinding, multi-stage continuous grinding or stage grinding (including rough grinding and tailing, medium ore and coarse concentrate re-grinding, etc.) and other grinding processes and grinding fineness Program comparison test. (8) Analysis of grinding products. The grinding feedstock and products (including medium ore, coarse concentrate, etc.) shall be sieved and the degree of monomer dissociation shall be determined.

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