SU749428A1 - Apparatus for cooling and disintegrating - Google Patents

Description

(54) COOLING & CRUSHING DEVICE

one

The invention relates to chemical machine building and can be used for cooling and grinding calcium carbide.

Calcium carbide is cooled in molds, or in mold conveyors, followed by grinding the ingots in a crusher. Separate cooling and crushing of calcium carbide is laborious, requires large production areas and is characterized by severe sanitary conditions of workers because of the high temperature of calcium carbide and the release of toxic gases from it (carbon, phosphine, etc.).

A device for cooling and grinding calcium carbide in a granulation drum 11 is known.

It is also known a device comprising an externally rotating rotating cylindrical body with grinding elements disposed therein and classifying devices.

The inner surface of the body has grinding elements, made in the form of - longitudinal ribs / lines 500 mm wide, 150-200 mm wide and arranged in chess order.

To retain large pieces of calcium carbide, additional diaphragms are installed inside for additional cracking. 5 The melt crystallizes on

the inner surface of the head, and grinding - from the impacts of the longitudinal ribs on the pieces of calcium carbide and from the blows of the pieces during the Fall (2.

10 The disadvantages of this device are the over-crushing of calcium carbide and its large losses. The amount of carbide fines and dust (Fraction 0-30 mm) is 40-500 / 0.

The concentration of calcium carbide in the product is reduced by 4-5% due to its additional oxidation by oxygen and moisture vapor contained in the inert gas, as a result of an increase in the contact surface. 20. The time of passage of small pieces (less than 30 mm) through the device is longer than large ones, which increases the dust formation from abrasion and the decomposition of calcium carbide by oxidizing agents.

i | c; ib is isotopic of the increase in es | .fracticity # of comminution of the material preventing eiQ of overgrinding.

To achieve this goal, in the proposed device, which contains cooling Mg outside the vrash.uyyis cylinder, housing placed in it grinding elements and classify the device, grinding elements are made in the corner, in which the impact rib has holes, the edge adjoining it is made in the form of a segment and is set at an angle of 45 ° to the axis of the drum, with one hole in the impact edge of the grinding element made in the form of a gap between the impactor with the 1m edge and the body of the drum.

FIG. I schematically shows the device, the communities of the front; in fig. 2 - scan, devices; in fig. 3 shows section A-A in FIG. 2; in fig. 4 - grinding element, obgtsir view.

The proposed device consists of water cooled housing 1 with a head 2, a support station, 3, a drive 4, an unloading unit 5, a head cooling system 6, grinding elements 7. A tray 8 is used to fill the melt onto the inner surface of the head 2. Grinded calcium carbide enters the receiving hopper.

In the tail end of the drum there is a reHieTKa that retains pieces of calcium carbide with a size greater than 80 mm.

The device works as follows.

The housing 1 is rotated at a speed of 8-12 revolutions / min using the reference station 3 and the drive 4. The molten calcium carbide from the furnace through tray 8 enters the die 2, where it crystallizes, in a layer. The head 2 is cooled by the cooling system 6, and the housing 1 is cooled from the outside (in front) through the cooling water collector.

By virtue of the force of gravity, calcium carbide when turning the drum is separated from the surface and destroyed into large pieces of 200-400 mm in size. Further ground, these pieces are the angle KOBt; iM grinding elements 7. The holes in the shock edge have a diameter of 80 mm, the width of the gap between the impact rib and the body of the drum is also 80 mm. When the drum rotates, the impact rib of element 7 destroys large pieces of calcium carbide. In this case, pieces with a particle size of less than 80 mm are placed in holes in the impact rib and in the gap between the drum body and the impact rib on the adjoining rib, through which, under the influence of gravity, they are removed from the crushing zone. Pieces greater than 8 mm are lifted by the impact rib and are destroyed from falling on the body of the berabane.

(. The ground calcium carbide through the discharge unit 5 enters the receiving bin,

At the end of each operation, the calcium carbide is drained out of the furnace due to a significant reduction in the flow of the drain. Of the calcium carbide, the final crystallizes into small pieces that do not require additional crushing.

These pieces pass into the slot and holes of the impact rib and are removed from the crushing zone without being further crushed.

The location of the conjugate edge of the carbon 7 at an angle of 45 ° removes dust from the accelerated movement of calcium carbide through it in the drum without destruction.

Performing a conjugate rib in the shape of a segment eliminates the spilling of calcium carbide at low angles of rotation of the drum. The advantages of the proposed grinding device are that only large pieces are crushed here. Small and marketable calcium carbide fractions (25-80 mm) without resolution are removed from the crushing zone and thus their overmilling is excluded.

The reduction of the residence time in the device according to the size of the product reduces losses from abrasion and oxidation.

Compared with the known devices, the loss of the liter of calcium carbide in the device described above is reduced by 4550%, and the formation of fines is reduced by 35-40%.

Claims (2)

Invention Formula I. A device for cooling and grinding, preferably calcium carbide, containing an externally rotatable cylindrical body, with grinding elements disposed therein and classifying devices, characterized in that, in order to increase the grinding efficiency of the material and prevent its regrinding, the grinding elements are made in the form of a square in which the shock edge has holes, and the edge adjoining it is made in the form of a segment and set at an angle of 45 ° to the axis the drum. 2. A device according to claim 1, characterized in that one hole in the percussion rib of the grinding element is made in the form of a gap between the percussion rib and the body of the drum. Sources of information taken into account in the examination I. German Patent No. 883224, cl. 50 C 8/01, 1949. 2. Ershov V. A. Danzis A. B. and Reutovich L. N. Production of calcium carbide A., 1974. p. 142. - ttt77177 TI7p j Y,. j j j jf at Lfj j-ji x x l / 7ptgg h bt phage 2