Group 1 - The core viewpoint of the articles highlights the growth and support of high-tech enterprises in Songming County, particularly focusing on the success of Yunnan Kairuite Engineering Machinery Co., Ltd, which has signed orders exceeding 200 million yuan as of October this year [1][2] - Kairuite is recognized as the largest mobile crushing and screening enterprise in Southwest China, holding numerous independent intellectual property rights and has been awarded various national titles, including "Little Giant" and "National High-tech Enterprise" [1] - The county's government actively supports high-tech enterprises through financial subsidies and policy guidance, exemplified by Kairuite receiving a 2 million yuan special subsidy to enhance its research and development efforts [1][2] Group 2 - Songming County has implemented a strategy to cultivate high-tech enterprises as a means to drive industrial transformation and enhance regional innovation capabilities, with a goal of reaching 103 high-tech enterprises by 2025 [2] - The county's Science and Technology Bureau conducts frequent visits and training sessions to encourage companies to increase their R&D investments and apply for high-tech enterprise status, fostering a supportive ecosystem for innovation [2] - In the first ten months of this year, 177 industrial enterprises in Songming County achieved a total output value of 13.595 billion yuan, with high-tech enterprises contributing 4.286 billion yuan, accounting for 31.53% of the total output, indicating their role as a new driving force for the local economy [3]

Crushing and Screening Stage - The initial step involves selecting high-purity, low-gray particles from larger ore types like quartzite, followed by crushing using jaw or cone crushers, ensuring the desired particle size through a closed-loop system with vibrating screens [2] - The crushed product is then processed in a sand-making machine to obtain quartz sand of specific granularity [2] Grinding Stage - Quartz sand grinding typically employs a single-stage or two-stage overflow ball mill, with the second stage forming a closed-loop cycle with a spiral classifier or hydrocyclone to ensure the required fineness [3] Beneficiation Stage - To achieve high-purity industrial quartz sand, further purification processes are necessary after obtaining quartz sand of a certain granularity, including washing, classification, scrubbing, magnetic separation, flotation, and acid leaching [4] - Washing and classification are essential to remove clay and impurities, as the quality of quartz sand decreases with smaller particle sizes [4] - Scrubbing utilizes mechanical force to remove iron films or adhering impurities from quartz particles, followed by separation of finer particles using a hydrocyclone [4] - Magnetic separation effectively removes weakly magnetic impurities like hematite and biotite, using wet permanent magnetic drum separators for weak magnetic and high-gradient magnetic separators for strong magnetic separation [4] - Flotation aims to remove non-magnetic impurities such as feldspar and mica, with HF commonly used as an activator in the process [5] - Acid leaching exploits the solubility properties of quartz to separate and purify it, as quartz is nearly insoluble in common acids except for HF [5] - Microbial leaching is an emerging technique that uses specific microorganisms to remove iron films from quartz sand, showing promising results in laboratory settings but requiring further industrial research [5]