SU90797A1 - Method of dust free production of dinas - Google Patents

Description

New in the proposed method is that the grinding of powders used grinding mills, vacuum filters and quick dryers-mixers for dewatering the mass without processing in the mixing runners.

When preparing the dinas according to the proposed method, the quartzite taken from the warehouse by an excavator, a scraper winch or a mechanical shovel is moistened with a conveyor of polioot into the hopper above (the Washing drum, and hence to Hicj o Byyio crusher located below the discharge drum of the washing drum. - / serves the ox. The crushed quartzite is taken away by the trais: the first person delivering the material to the grinding runner, located on the second floor level, into which water is supplied in the quantity necessary for quartzite moisture content i; oc, e grinding within 3-4Cho.

This moisture gholnoe; oo eliminates dust.

On the runner pierce t.tko g redvari: teliy grinding to: vartsit. It is equipped with sieves with slotted holes, having a width of 15-18 mm, 1C ;; I feel the ground; I have a screen that provides: a move) on the runner, no larger than 17 mm in size.

To intensify the cleaning of the runner bowl, it is possible to use low-precipitated cleaners;

The product of the be1-UNA falls into the combined stationary trough, through which it enters the first toll of the wet field, it is open; it is below the runner.

Regulation of grain syst; ditch a (s) The size of pieces of material is cast at G redwar lolol 1; the treatments are 1 ° to iitam; g: oet about the floor; ol in the pulp regulate the grain composition of the grinding product and dosage, which is necessary for the production of dinas.

The output of the selection into the mill is regular ;;;;: and the duration of its mill. Prolonged resident 90797. .- 2 -

Simultaneously with quartzite, lime powder is loaded into the mill using a closed auger mold, automatically interlocked with a quartzite feeder to maintain the constant uji-ixTbi. Co-processing of these components in a ball mill gives a good distribution of lime additive in the charge.

The slurry, containing 30–40% of water, is dewatered on a continuous vacuum M vacuum filter.

The elimination of the settling of large grains of solid in the pulp is carried out by a powder filter trough supporting horizontal rakes that swing during operation and move the pulp to be filtered. In order for the latter, when exiting a ball mill, to flow by gravity into the filter trough, it is placed below (mills.

The filtrate water containing lime is returned to the mill by a pump.

Removed from the rotary filter drum with fixed scraps, the filtered material is fed with a belt conveyor to further processing. Transportation of a mass with a moisture content of 8-10% does not cause dust extraction. Therefore, an open belt conveyor can be used for this operation.

Further dewatering of the dcasum mass occurs simultaneously with the displacement operation. A two-shaft mixer is used for additional mixing. The addition of the mass to the required moisture content is carried out in the mixer trough, which is the bottom.

Thus, mixing in the mixer, the mass dries out, somewhat condensing. Before its release, a binder additive (molasses or cellulose sulphite liquor) is fed to the mixer. Removal of the steam generated in the mixer is performed by exhaust ventilation with a tightly closed casing,

The ready mass with a moisture content of 4-5% is transported to the presses by an electrovibration conveyor. The lower nozzles of the conveyor in order to avoid mass spillage when feeding the presses are connected to their receiving bunkers with canvas sleeves. The mass enters the presses, is somewhat warmed up, which favorably affects the quality of pressing and the acceleration of drying.

Sources of dust emission are transportation and processing of rejects of drying and waste of presses.

In order to carry out these operations, installation is provided parallel to the line of presses, close to them and below the floor level, of a belt conveyor with a concrete covering of its trenches and several hatches with tightly closing lids. The marriage of the tree is collected into a closed trolley, which is rolled up after being filled to one of the hatches and unloaded by means of a folding bottom onto the conveyor.

In the same way, waste mass from presses can be loaded on the conveyor. A conveyor belt delivers the material to a vacuum filter, into the trough of which it is discharged. Being in a wet pulp and exposed to a moving rake, the raw reject and mass are destroyed and mixed with the T1 solid part of the pulp.

The conveyor trench is equipped with exhaust ventilation.

Further operations of the dinas production process are carried out according to a known technology.

Subject invention

The method of dust-free production of dinas, characterized in that wet grinding mills, vacuum filters, and dryers-mixers are used to grind powders to dewater the mass without being treated in mixing runners.