Method for separating fine cassiterite

Abstract

The invention relates to a method for separating fine cassiterite, which is characterized by comprising the following steps of: grinding a raw ore, performing size mixing, and performing flotation on a sulfide ore; performing magnetic separation on tailings of the sulfide ore subjected to flotation, and grading the tailings subjected to magnetic separation into particles of +0.043mm and particlesof -0.043mm; performing gravity separation on the particles of +0.043mm by using a spiral chute and a shaker to obtain a shaker cassiterite concentrate; desliming the particles of -0.043mm by using acyclone to obtain cyclone settled sand; performing size mixing, primary flotation roughing, primary flotation scavenging and primary flotation cleaning on the cyclone settled sand to obtain a flotation coarse concentrate; performing gravity separation on the flotation coarse concentrate by using a centrifugal ore separator to obtain a centrifugal gravity separation cassiterite concentrate; and mixing the shaker cassiterite concentrate and the centrifugal gravity separation cassiterite concentrate to obtain a total cassiterite concentrate. Roughing is performed by the spiral chute, so that theprocessing capacity in a unit area is greatly improved, the occupied area is saved, and separation efficiency is high; and flotation roughing and gravity separation cleaning are combined, so that theconsumption of a flotation agent is low, cost is low, the ore separation enrichment ratio is 5 to 10, and the recovery rate of the cassiterite is high.

Description

technical field

[0001] The invention relates to an ore dressing method, in particular to an ore dressing method for fine-grained cassiterite. Background technique

[0002] Due to its special physical properties such as brittleness and fragility, cassiterite is easily muddied or over-crushed in the process of ore crushing and grinding, resulting in a large amount of secondary slime. In particular, fine-grained cassiterite, which is densely symbiotic with sulfide ore or iron minerals, or wrapped by gangue minerals. If the effective monomer dissociation of cassiterite minerals is realized, the ore needs to be finely ground, so that secondary slime will inevitably be produced, so fine-grained cassiterite is difficult to separate. At present, about 80% of the tin lost in my country every year is in the form of fine mud and lost to the tailings.

[0003] Tin ore beneficiation methods are mainly gravity separation and flotation. Due to the large specificity of cassiterite and th...

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