午夜免费福利不卡网址92_国产欧美日韩视频在线观看一区二区_亚洲国产日韩在线观频_大片免费播放在线观看视频_真实国产乱子伦精品免费_七龙珠gt国语版全集高清_99久热只有精品视频免费看_亚洲欧美日韩国产专区一区_日本国产精品欧美_国产欧美另类,AV片免费大全在线观看不卡,国产V亚洲V天堂无码久久久,亚洲综合国产成人丁香五月激情

Industrial waste refers to the solid waste discharged by the factory during the production process. Such as cutting debris, grinding debris, waste sand, etc. in the machinery industry, activated carbon residue and silicates in the food industry, waste fabrics and leather produced by the clothing industry. At present, the annual production of general industrial solid waste in China has exceeded 1.5 billion tons, of which resource utilization accounts for only a small part, and most of the industrial solid waste is dumped and discarded, buried or stored for future treatment. Due to the complex and diverse composition of industrial waste, high value-added materials, low value-added materials and completely worthless impurities mixed together, resulting in high value-added garbage and higher disposal costs, how to efficiently separate these materials with different added value from industrial waste has become a major difficulty in resource disposal.