A method and system for thickening the whole tailings slurry paste

Abstract

The invention discloses a thickening method and a thickening system of whole tailing material slurry paste, wherein the thickening method includes following steps: (1) feeding whole tailing material slurry into a cyclone machine to separate the whole tailing material slurry into crude granular mortar and fine granular mortar, wherein the crude granular mortar, at a bottom flow, is fed into a vibrating sieve while the fine granular mortar, at an over flow, is fed into a thickener; (2) in the vibrating sieve, vibrating the fine granular mortar to sieve the fine granular mortar and feeding the fine granular mortar into the thickener, wherein crude granules are discharged into a sand bin; (3) feeding an over flow in the cyclone machine into the thickener and feeding the bottom flow in the thickener into the sand bin; and (4) in the sand bin, mixing the crude granular mortar and the fine granular mortar to obtain the paste. The thickening system is composed of the cyclone machine, the vibrating sieve, the sand bin and the thickener, wherein a material slurry pipe is connected to input of the cyclone machine. Outputs of the cyclone machine include two groups, one is connected to the vibrating sieve and the other is connected to the thickener. The outputs of the vibrating sieve include two groups, one is connected to the thickener, and the other is connected to the tail sand bin. The output of the thickener is connected to the sand bin. In the invention, the tailing material slurry is separated into crude granular mortar and fine granular mortar and then is thickened, so that thickening concentration can reach 70-82%, which is higher than that of a deep-cone thickener and a sand bin by 2-5%. The tailing utilization rate is higher than 95%.

Description

technical field [0001] The invention relates to the technical field of tailings treatment, in particular to a method and system for thickening the whole tailings slurry. Background technique [0002] As the main waste discharged from mine solid waste, tailings account for a large proportion of industrial solid waste discharge. At present, the main methods of processing and utilizing tailings are tailings pond discharge and underground filling. [0003] When the tailings pond is discharged, the low-concentration tailings slurry produced by the general dressing plant is directly discharged to the tailings pond or discharged to the tailings pond after being thickened by a thickener. The tailings slurry is naturally settled and dehydrated in the tailings pond, and the backwater It is transported to the dressing plant for continued use. Due to the low concentration of tailings slurry in this method, the amount of dehydration is large, the cost of return water transportation is h...

AI Technical Summary

Problems solved by technology

The effect of the first and second methods on the thickening of the whole tailings paste is not stable, and is greatly affected by the difference in the properties of the tailings. The concentration cannot reach the paste properties, the dense concentration is low, and the overflow concentration of the first method is relatively high

When used for underground filling, since the second method does not have a silo for storing tailings paste, it is affected by the operation time of the dressing plant

The third method uses machinery to separate the tailings slurry from solid to liquid, but the separated wastewater still needs to be treated before it can be used. The dehydration efficiency is low, the energy consumption is large, the process is complicated, and the cost is high.

The third method has poor applicability to the tailings properties. For example, when the sulfur content in the tailings slurry is high or the average particle size of the tailings is fine, the ceramic filter holes are easily blocked and cannot be used smoothly.

At present, the tailings thickening technology generally uses the principles of natural sedimentation dewatering, centrifugal sedimentation dewatering, mechanical dehydration, etc. These principles are not effective for the whole tailings slurry with large mud content.

The centrifugal sedimentation principle of the cyclone and the vibration dehydration principle are combined with high thickening efficiency and good effect, but it is only suitable for tailings with low mud content

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