Winnowing and magnetic separation method and device for reclaimed foundry sand

Abstract

The invention relates to a winnowing and magnetic separation method and device for reclaimed foundry sand. Old molding sand containing sand grains, dust and ferrochrome particles are respectively subjected to magnetic separation, winnowing and screening in a cylinder, the ferrochrome particles are separated out of in the magnetic separation process, dust is separated out in the winnowing process, and sand grains with the grain size meeting the specified requirement are separated out in the screening process. A dry type magnetic separation cylinder is fixed to the middle of the cylinder and can rotate around a rotating shaft, and a backflow type guide plate is arranged in the cylinder at the upper portion of the dry type magnetic separation cylinder. At least two screens are arranged in the throwing-out direction of the dry type magnetic separation cylinder, a blower nozzle is formed in the cylinder corresponding to the lower end of the upper-portion screen I and connected with an air blower, a compressed air purge device is arranged in the cylinder under the lower-portion screen II, and a sand discharging port is formed in the bottom of the cylinder. An ash discharge bin is arranged under the screen II, and an ash discharge port is formed in the bottom of the ash discharge bin. The winnowing and magnetic separation method and device can optimize the grain size composition of reclaimed sand while magnetic separation, the phenolic resin and curing agent liquid using amount can be decreased and the quality of the molding sand can be improved during repeated usage.

Description

technical field [0001] The invention relates to a recycling equipment for foundry sand, in particular to a wind-magnetic separation method and device for foundry regenerated sand. Background technique [0002] The foundry industry is the basic industry in the manufacturing industry. Every ton of casting production in my country will discharge about 1 ton of waste sand, and the annual discharge of foundry waste sand is more than 30 million tons. The resource consumption and environmental pollution are very alarming. While the enterprise discharges a large amount of foundry waste sand, the enterprise needs to add an equal amount of new sand to the production line to maintain the operation of the production line. The annual purchase cost and transportation cost of new sand caused by this in the whole country amount to tens of billions of yuan, which brings a huge economic burden to the enterprise. , but also bring enormous pressure to our country's resources and environment. T...

AI Technical Summary

Problems solved by technology

The main particle size of the sand used in casting should be greater than 30 mesh, and this kind of sand selection equipment cannot separate the sand particles with a particle size of less than 30 mesh and cannot be sucked away by the dust collector, so that the fine sand in the recycled sand is too much and the dust content is high. Large, unable to meet the requirements of casting for sand grain size, sand mold air permeability and sand mold quality

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