Abstract:

The major valuable elements of a certain lead-zinc mine in Guangdong Province are tungsten，lead and zinc，containing 1.32% of tungsten，1.77% of lead，1.87% of zinc，and accompanying with silver.Tungsten mineral content exists mainly in the form of wolframite，and a small amount in the form of scheelite and tungstite.Among them，the wolframite is brittle，which would cause a over crushing phenomenon in crushing and grinding process.However，the existing beneficiation technology is difficult to recover fine practical tungsten，so lead to the loss rate of tungsten increased.Different grinding media have a significant influence on mineral dissociation and grinding efficiency.Particle size analysises to grinding products of different grinding media were done in this paper，and separation experiments were carried out respectively，which indicated that hexagonal prism as grinding medium had good selective effect on fine mineral particles and thus reduced the production of refractory size fraction.With hexagonal prism as grinding medium，technological process of grinding with hexagonal prisms-table separation-suspension vibration sorting to over flow products was employed to tungstenic lead-zinc mine in Guangdong and rough concentrate was obtained containing 15.41% of tungsten，16.21% of lead，17.03% of zinc and 167.92 of silver.Meanwhile，recovery rates of tungsten，lead，zinc and silver were 81.31%，63.97%，63.63% and 46.46%，respectively，and loss rates of tungsten，lead，zinc and silver in shaking table tailings were 8.08%，12.89%，17.16% and 22.80%，respectively，achieving the goal of comprehensive utilization of resources.By introducing a new type of grinding medium hexagonal prism，the index of a certain lead-zinc mine in Guangdong dramatically improved，has made remarkable achievements.

Key words: tungsten-containing lead zinc ore, grinding medium, table separation, hexagonal prism, comprehensive utilization