RU1806016C - Method for crushing and classifying product - Google Patents

Description

The foam characteristics for the dust suppression process should provide absorption of dust and sludge particles in the crusher, as well as the fluidity of the foam and can be approximately accepted K 20-30 with a bubble size of 2-4 mm.

The method is implemented in the installation shown in the drawing.

The crushing and classification system for the material consists of two parts - foam dust suppression at the loading and receiving hoppers of the crusher and foam separation and classification of the crushed product in the classifier-deslamator (KD). The crusher 1 is equipped with a loading hopper 2 for initial feeding and a receiving hopper 3 for the crushed product, equipped with foam injection devices 4 and 5, valve 6 allows the foam flow rate to be regulated on each device. The foam input device is a pipe with foaming holes extending along the wall of the hopper. In the feed hopper, the foam completely fills its volume, covering the feed, thereby sealing the inlet of the crusher. In the event that the crushed product is then sent for recovery and screening, dust suppression in the receiving hopper is mandatory. However, for the installation under consideration, in which the crushed product from the crusher is directly fed to the CD, the use of dust suppression in the receiving hopper (as well as on conveyors in the material filling units) is technologically justified, since it allows to prevent the possible removal of dust particles from the CD through the drain threshold together with large air inclusions, which from the crusher (receiving hopper) enter the KD foam in case there is no dust suppression in the receiving hopper.

The crushed product and the foam, carrying dust and sludge particles, through the device 7 for loading the crushed product enters the CD for the screen, consisting of a sieve 8 and a screen box 9 and placed in the casing KD 10 with a cover 11 and a discharge funnel 12. The KD includes a device 13 for introducing foam into the KD, a foam generator 14 (common for the crusher and KD in the installation under consideration), a drain threshold 15 for output with sludge foam, a gate 16, a discharge pipe 17 and a discharge pipe 18 for output from the CD to the sieve and undergrate - th products of material classification n din. The angle of inclination of the sieve is 30-45 °, depending on the type of screen used in the CD (type of screen or screen). Sieve mesh size corresponds

threshold of separation of material by size. Foam is fed to the bottom of the CD case, under a screening screen. Rising up, the foam washes the material on the sieve,

entrainment of sludge particles. Sludge with foam is discharged through a drain threshold in the upper part of the CD body.

When the multiplicity of the foam K 20-100, the volumetric water content in the foam is 5-1%,

which, given the low consumption of foam for dust suppression, deslamation and ablation of foam with an oversize and sublattice product, can drastically reduce water consumption for dust suppression and deslamation

5 (classification) of the material. The ability to reduce water demand is important in terms of developing environmentally friendly mineral processing technologies. Moreover, the products of classification are practically dry material that does not require subsequent dehydration; decontamination products contain 7-10% water by weight - subject to preliminary

5 dust suppression, as well as the characteristics of the foam used in CD. The use of high-frequency foam makes it possible to obtain a technically simple solution to the problem of dust suppression in the crusher, followed by

0 reclamation and classification of the material. Non-ionic surfactants can be used in the installation, regardless of the source material. characterized by low chemical activity and biological 5 soft in relation to natural complexes. Consumption of surfactants, taking into account the solid phase in the foam, will be about 2% of the mass of water.

Claims (1)

The claims 0 A method of crushing and classifying a product, including feeding the product to a crusher with receiving and loading hoppers, the subsequent transfer of crushed material to the classifier, 5 is made with a roar and unloading devices through which the over-sieve and under-sieve products of classification are removed, characterized in that, in order to provide dust suppression to the mill 0 days of crushing and classification, a high-level foam obtained in a foam generator using foaming surfactants is introduced into the process: to the crushing stage, to the loading and 5 the receiving hopper of the crusher and to the classification stage, to the lower part of the classifier housing, while the foam is fed from the lower part of the classifier housing through a screen to its upper part and output together with the sludge through the drain threshold,