With global demand for high performance materials continues to rise, the significance of beryllium as a critical material will become increasingly pronounced, making the stability of its resource supply a pressing concern. How to efficiently develop low-grade beryllium ore has become a key challenge for beryllium resource management. This study proposes an alkaline melting enhancement process to facilitate the efficient leaching of beryllium from low-grade beryllium ore. Experimental results demonstrate that the direct sulfuric acid curing leaching of beryl yields suboptimal results, with a maximum leaching efficiency of 33.5 %. At 1500 °C, Al 2 Be 3 Si 6 O 18 decomposes into Be 2 SiO 4 , Al 2 BeO 4 , and SiO 2 , resulting in a leaching efficiency increase to 61.67 %. Inadequate CaO addition during the alkaline melting process results in the formation of SiO 2 -Al 2 O 3 -CaO, SiO 2 , and partial BeO, while the remaining Be is included in the glass phase. The optimal conditions for the alkaline melting of beryl are 1300 °C for 2 h with a 35 % CaO addition. Under these conditions, the leaching efficiency of Be can reach 97.02 %. This method enables the efficient extraction of Be from low-grade beryllium ore, providing both theoretical support and technical guidance for the sustainable development and efficient utilization of beryllium resources.
Jianjun Sun,Liuyang Dong,Tianfu Zhang,Peilun Shen,Dianwen Liu
Copper slag (CS) contains high-value metals (Fe, Co, Cu, and Zn), but traditional mineral processing has high energy consumption and poor cost-effectiveness. To tackle such problems, the present research puts forward an innovative method where Ag + -catalyzed ammonium persulfate (APS) oxidation enhances low-temperature H₂SO₄ curing and water leaching of valuable metals in CS. Process mineralogy analysis, thermodynamic evaluation, single-variable experiments, and a range of characterization methods were employed to elucidate the CS features, verify process feasibility, evaluate metal leaching rates, and reveal Ag⁺'s leaching enhancement mechanism. Results show that 96.59 % Fe, 90.36 % Co, 95.12 % Cu, and 94.28 % Zn were leached from CS. Compared with the traditional H 2 SO 4 curing process, their leaching rates increased by 3.85 %, 6.58 %, 19 %, and 6.16 %, respectively. Meanwhile, the curing temperature decreased from 200 °C to 80 °C (120 °C reduction), and H₂SO₄ consumption fell by 10 %. Mechanistic analysis reveals that Ag⁺ enhances leaching through two pathways: First, it catalyzes APS decomposition to generate ·SO₄⁻ with high oxidizing activity. These radicals significantly accelerate the oxidation of sulfide minerals and low-valence iron-based minerals, driving reactions to more thorough completion and promoting formation of more water-soluble metal sulfates. Second, Ag⁺ transforms the cured slag's microstructure from initial dense, smooth state to crisscrossing crack network extending into particle interiors. This evolution not only provides channels for inward diffusion of H 2 SO 4 and APS (facilitating deep oxidation) but also creates favorable conditions for outward migration of water-soluble metal sulfates into the leachate. This method offers a low-energy, sustainable approach for large-scale CS utilization.
危险品化学品经营许可证（带存储）