slag free refining

例句：

1. 1. The company's commitment to slag-free refining is a testament to its dedication to environmental sustainability.
   该公司对无渣精炼的承诺体现了其对环境可持续性的执着。
2. 2. The new technology promises to revolutionize the slag-free refining process, making it more efficient and cost-effective.
   这项新技术承诺将彻底改变无渣精炼过程，使其更加高效和成本效益。
3. 3. In recent years, there has been a growing demand for slag-free refining due to concerns about environmental pollution.
   近年来，由于对环境污染的担忧，对无渣精炼的需求不断增长。