| 摘要 |
<p>A biological method for extracting metal from metallurgical and mineral solid waste comprises: crushing the solid waste, biological soaking, recycling the metal from leachate, and separating the soaked solid waste slag by a gravity concentration method. The method is characterized in that: crushing and sieving the metallurgical and mineral solid waste and then storing same in a biological soaking pool, adding water and stirring to form a slurry, then adding mixed bacteria composed of thiobacillus ferrooxidans, bacillus polymyxa and aspergillus niger into the biological soaking pool to make the number of viable bacteria in the slurry reache 500-1000 million/mL, performing oxygen aeration, soaking, turning over the solid waste once everyday and performing solid-liquid separation to obtain soaked solid waste and leachate, soaking the solid waste remained in the tank repeatedly, recycling the metal in the leachate and performing solid-liquid separation once again, introducing solution from the solid-liquid separation into the biological soaking pool for recycling, and separating the obtained soaked solid waste slag by gravity concentration method after 7-14 days. The treated tailings eventually obtained by the biological method meet the emission requirements according to "Test method standards for extraction toxicity of nonferrous metal solid waste" (GB5085.3-2007).</p> |
