3) Selection: First, the coarse concentrate is divided into three levels, namely: 4.5~1.5mm, 1.5~0.25mm. Respectively two front and floating shaker table to obtain the final sorting of tungsten concentrates, the fine fraction to be enriched by flotation or centrifugal concentrator and shaking. The sulphide ore selected from the flotation needs to be re-ground for separation and flotation, and the molybdenum and strontium concentrates are selected; the sulphide ore obtained by flotation at the fine-grained stage is no longer ground, and the flotation is directly carried out to obtain molybdenum and bismuth. Concentrate. A small amount of white tungsten in the tungsten concentrate is separated by magnetic separation. The coarse concentrate obtained by fine mud re-election is less than 0.03mm. The general grade is low, only 5~7%. According to the characteristics of tourmaline and sulfide ore, the flotation-swing belt chute has been used. 50~55% fine mud tungsten concentrate. In addition, the overflow generated in the selection process and the finely concentrated fine mud are all difficult materials. The Lv position is generally 7~9%. At present, the sulfonated paraffin soap is used as a collector to recover the tungsten. A coarse and fine refined tungsten fine concentrate with a grade of 25% or more is exported as a special product. Recent concentrate to improve the quality, impurity by acid leaching, to make a wolframite concentrate product rate reached 100%, the recovery rate also increased to selection of 97%. The main process indicators of the plant selection, unit consumption indicators in recent years, and main equipment are shown in the following table L: Zhejiang Kehao Plastic Machinery Co., Ltd. , https://www.khplasticmachinery.com
The dehydration of tungsten concentrate is carried out by a 1.2×3.5m cylinder dryer. After drying, the water content of the concentrate is generally below 1%.
The process of the selected section is shown in the following figure: 