The Strategy of Tungsten Tailings Recycling and Utilization for Plastic Packing

Tungsten tailing is a solid waste produced after the selection of tungsten ore, which is used to recycle useful metals and non-metallic minerals, but the component of metal recycled group is less and still remains a large amount of tailings. It is used in the production of glass ceramics, non fired bricks and hollow bricks, with limited usage, high technological cost and limited application benefits.

The use of mineral filler in plastic packing can reduce the cost of plastic products. A new type of plastic packing is developed by superfine processing classification of tungsten tailings and modification of surface active agent, which can effectively improve the strength of plastic products, reduce the cost of plastic production, and reduce the pollution of tungsten tailings solid waste to the environment.

The modification methods of tungsten tailings include the following steps:

(1) The tungsten tailings were dried by ball milling and ultrafine processing, and the fines of -800 were obtained, which accounted for more than 90% of the total mass of tungsten tailings.

(2) Then the obtained powder was preheated and dispersed in the heated mixing equipment, then 2% aluminate was added to the dry process. The modification time was 15min, the modified temperature was 120°C, and the activation index of the tungsten tailings was 67% after modification.

(3) The modified tungsten tail mineral powder is added to PVC or chlorinated PVC. The quality ratio of modified tungsten tailing to polyvinyl chloride (PVC) or chlorinated polyvinyl chloride (CPVC) is 0.3-1:1, mixed powder is added to mixing machine and mixed 30min, modified tungsten tailing is 60% of PVC resin. The powder after mixing is added to the twin screw extruder and is cut through cooling and cutting. To get the finished product of PVC plastic pipe.

The technology of the above method is simple and can make large amount of tungsten tailings to produce plastic fillers. Because of a large number of pomegranates in the tungsten tailings, the hardness is high, it can effectively improve the wear resistance and quality of the plastic products, greatly improve the comprehensive utilization value of tungsten tailings, turn waste into treasure, and have good economic and environmental effects.

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