Beneficiation method of low-grade tungsten ore

Abstract

The invention relates to a beneficiation method of low-grade tungsten ore. A combined technology including crushing and screening, photoelectric sorting, fine screening, ore grinding and dual-temperature flotation is utilized. Qualified tungsten concentrate is obtained through three-stage tailings throwing, low-grade tungsten ore resources are utilized, tungsten can be efficiently recycled, the recovery rate of the tungsten ore W2O3 reaches 85% or above, the grading cost can also be reduced, and the comprehensive utilization rate of the resources is improved. The method has the advantages of being simple and feasible, high in operability and environmentally friendly and having important reference significance for utilization of other mineral low-grade ore, and is suitable for the mining and metallurgy industry to use.

Description

technical field [0001] The invention relates to a beneficiation method of low-grade tungsten ore, which is suitable for application in the mining and metallurgy industry. Background technique [0002] The mining and metallurgy industry puts tungsten ore in W 2 o 3 Content ≤0.2% is defined as low-grade tungsten ore, that is, tungsten ore without industrial mining value. At present, the beneficiation of all grades of tungsten ore in the industry mainly adopts two processes of normal temperature flotation or heating flotation. The recovery rate of low-grade tungsten ore is about 60% when using normal temperature flotation technology, and the recovery rate is about 70% when using heating flotation technology. , with these two methods of flotation of low-grade tungsten ore, there are the following problems: one is to obtain W in the tungsten concentrate 2 o 3 The grade is only about 30% to 40%, which cannot be qualified; second, the cost of sorting is high, so that low-grade ...

AI Technical Summary

Problems solved by technology

At present, the beneficiation of all grades of tungsten ore in the industry mainly adopts normal temperature flotation or heating flotation. The recovery rate of low-grade tungsten ore is about 60% by normal temperature flotation, and about 70% by heating flotation. , with these two methods of flotation of low-grade tungsten ore, there are the following problems: one is to obtain W in the tungsten concentrate 2 o 3 The grade is only about 30% to 40%, which cannot be qualified; second, the cost of sorting is high, so that low-grade tungsten ore resources cannot be recycled

[0004] The black and white tungsten ore with a particle size below 0.04mm is desulfurized by flotation first, and the floating sulfur tailings are flotation + centrifugal concentrator gravity separation to obtain fine slime tungsten concentrate. , the production operation is difficult to control, and the processing capacity is limited; of course, some people have made breakthroughs in the recycling of relatively close low-grade tungsten ore: Chinese patent CN110479494A discloses "a kind of concentrate for improving the grade of low-grade scheelite flotation concentrate This method is aimed at low-grade scheelite, and adopts the combined process of "normal temperature roughing + heating and selection + gravity separation + secondary heating flotation of gravity separation tailings", although it can improve the scheelite grade and quality, but its process is long, and the re-selection efficiency is low, the investment is high, and the cost per ton of ore is high; For tungsten ore, the following process steps are adopted: gravity separation and tailing removal, magnetic separation for iron removal, sulfide ore flotation, normal temperature roughing of scheelite, heating and selection of scheelite, and qualified scheelite can be recovered, but the process is complicated and The sorting process is long, the cost per ton of ore is high, and affected by the gravity separation process, it is difficult to achieve large-scale

Images