Abstract
ABSTRACT: Potassium salt rock is a typical discontinuous heterogeneous material formed naturally, which is mainly composed of carnallite, sylvite, halite and so on. Potassium salt is widely used in various industry fields (such as agriculture, chemical industry, medicine, metallurgy, electroplating, printing and dyeing, glass, etc.) and has a large demand. One of the important sources is the mining of solid potassium salt mines. Through the laboratory test of solid potassium salt ore samples obtained from an underground potassium salt mine in a mine in Laos, various mechanical parameter data of potassium salt ore deformation and failure can be obtained intuitively and effectively, so as to provide theoretical and data basis for the design of specific engineering parameters such as pillar strength calculation and size optimization. In this paper, the large potassium salt ore obtained from the underground mining site of a potassium salt mine in Laos was cut and cored, and the cylinder and disc standard specimens of the potassium salt rock were obtained. By simulating the underground moist environment under different humidity conditions, potassium salt cylinder specimens with different water contents were prepared in the laboratory. Then, the uniaxial compressive strength test and other indoor tests were carried out on these potassium salt specimens, and the test results were obtained and analyzed in depth. The results show that the potassium salt ore sample exhibits typical plastic rheological properties under the condition of unconfined uniaxial compression, and its uniaxial compressive strength in the natural state is roughly between 6.7MPa -9.3MPa; and within a certain range of water content, the uniaxial compressive strength of potash ore samples gradually decreases with the increase of water content. Through the analysis of strength deterioration characteristics of solid potash ore, it can provide scientific guidance for the optimization of pillar size in underground mining of solid potassium salt ore with different moist environments, and then lay a theoretical foundation for improving the underground mining recovery rate of potassium salt ore and reducing the waste of resources. 1. INTRODUCTION Potassium salt is a non-metallic mineral with potassium chloride and sulfate minerals as the main components (Bai et al., 2014). The main potassium salt minerals are sylvite, carnallite, potassium magnesium alum, anhydrous potassium magnesium alum, polyhalite, potassium magnesium alum, soft potassium magnesium alum and so on. In its raw state, potassium salt is an important industrial and agricultural mineral, which has important economic value, (Cheng, 2007). It is mainly used as potassium fertilizer, which is an important agricultural fertilizer resource and one of the three essential fertilizers for crops. Therefore, it is of great significance to study the mining of underground solid potash ore.
Published Version
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