Tailing recycling zero discharge system and process

Abstract

The invention belongs to the technical field of tailing recycling and discharge, and particularly relates to a tailing recycling zero discharge system and process. The system comprises a tailing dry discharge machine, a tri-hydrogen purifying body and a chamber type filter press. Tailings are subjected to mud and sand separation through the tailing dry discharge machine, mud-water separation through the tri-hydrogen purifying body and solid waste dry discharge through the chamber type filter press to achieve dehydration and recycling of the tailings and fine sand. The purified tail water suspended solid (SS) is less than 300mg / L (excluding special materials), higher than the third-level emission standard of tail water discharge in the mining industry in GB8978 Integrated Wastewater Discharge Standard, and the fresh water reuse rate is greater than 80%, in line with national standards for reuse of water resources for industrial mining, mineral processing and the like. The dry stacking and dry discharging of the solid waste are achieved. The moisture content of a pressure-filtered mud cake is less than 60-75%, reaching the national standard for dry stacking and dry discharging or blended landfill.

Description

technical field [0001] The invention belongs to the technical field of tailings (tailings) recovery and discharge, and in particular relates to a tailings (tailings) recovery zero-emission system and process. Background technique [0002] Tailings (tailing sand) are materials discarded after extraction of useful minerals through crushing, grinding, sorting and other processes in the concentrator, usually in the form of ore slurry and sand washing tail water. At present, the treatment of tailings in mineral processing plants is to build a thickener inside or near the mineral processing plant. The overflow of the thickener is returned to the mineral processing plant as backwater for reuse. The bottom flow of the thickener is pumped or piped to the tailings pond or Stockpiled in the mine dam, the clarified water from the tailings pond or tailings dam is returned to the beneficiation plant for reuse, or is discharged out after being treated up to standard. Another process is th...

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Problems solved by technology

[0003] The above-mentioned treatment has high production costs, difficult operation and maintenance, inconvenient installation and debugging, and has a great impact on the surrounding environment. It cannot reasonably solve the problems of dry stacking of mine tailings, purification of mining and dressing tail water, and dry discharge of solid waste. In addition, non-metallic tailings ( Tailings) can be used in many fields such as building construction, roadbed construction, highways, aerated bricks, etc. It is a tailings treatment technology vigorously advocated by the state. The reuse of metal tailings can increase the added value of metal mines and improve efficiency , to reduce environmental pressure, so it is urgent to develop a tailings (tailings) recovery zero-emission system and process

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