Ore screening system and technology

Abstract

An ore screening system comprises a vibrating screen, a cleaning device, a sand stone separator, a settling pond and a water circulation system. The invention further provides an ore screening technology. The technology comprises the steps of cleaning raw ores while performing primary screening on the raw ores through the vibration screen to obtain cleaned ores with particle diameters larger than space among vibration screen strips and primary residues; performing secondary screening on the primary residues through the sand stone separator with space between an auger and a casing being smaller than the screen strip space of the vibrating screen to obtain coarse ores with particle diameters being between the space between the auger and the casing of the sand stone separator and the space among the vibration screen strips and secondary residues; subjecting the secondary residues to precipitation separation to obtain top clear water and bottom tertiary residues; subjecting the top clear water to circulation to the cleaning device for recycling. Compared with traditional methods, the ore screening technology has the advantages that impurities in the ores can be fully screened, and the waste water and waste discharge amount can be reduced.

Description

technical field [0001] The invention relates to an ore screening system and an ore screening process. Background technique [0002] Ground calcium carbonate has the advantages of high chemical purity, high inertness, high whiteness and good dispersibility. It is a commonly used inorganic filler and has been widely used in the field of papermaking. Ground calcium carbonate is ground from natural carbonate minerals such as calcite, marble, and limestone. In the mining process, forklifts are often used to get on the truck, resulting in a large amount of sediment in the ore. In addition, the process of transporting the ore from the mine to the production site needs to go through intermediate links such as automobile transportation, shipping, and automobile barge. During these transportation processes, the ore surface and ore fragments are easily polluted by impurities such as soil. In order to ensure the quality of the later stage products, it is necessary to wash the ore, and...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main methods for ore washing. The first method is to screen through a vibrating screen. This method can remove part of the waste rock chips in the ore, but the impurities adhering to the surface of the ore, such as soil, cannot be removed.

The quality of the ore screened by this method will be affected by crushing and grinding, and the screened waste rock chips cannot be recycled because they contain a large amount of impurities such as sediment, so they can only be discarded, with a waste rate of about 5%.

The second is to use a drum washing machine for washing. This method can use clean water to clean the impurities adhered to the surface of the ore, but the waste water generated by washing the ore is directly discarded and discharged, which causes a lot of water resources to be wasted. As the ore is continuously brought up and thrown down when the drum is running, the surface layer of the ore is peeled off, which greatly increases the waste. The waste rate can reach more than 10%, which greatly reduces the product yield and increases the production cost.

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