SU1423495A1 - Method of sintering phosphate raw material - Google Patents

Abstract

The invention relates to the technology of preparation of phosphate raw materials to a process productivity of 0.88 t / mh, the process of phosphorus electric sublimation. Phos-3 tab. fine fines, coke and return are mixed with a mass ratio of 87: 5: 8 and crushed to K1 resistance less than 0.1 mm. The resulting mixture is pelletized to a granule size of 10-30 mm with moisture up to 10%. The obtained granules are loaded onto the grate of the sintering machine with a layer height of 270 mm. A layer of calcined agglomerate with a fraction of 10–20 mm and a height of 40 mm is placed on top. The mixture is ignited with a gaseous coolant with a temperature of J2QO C. Then, it is sintered through a layer of atmospheric air. The method allows to increase the yield of agglomerate of the 10-70 mm fraction to 95% and the process productivity from 0.88 t / m-h, table 3. (L

Description

Yu

Garden

4: CO

sd

This invention relates to a process for the preparation of phosphate raw materials for the phosphorr electric sublimation process.

The aim of the invention is to increase the yield of the product and the manufacturer of the IHOCTH process,

I Example, Phosphate mix, jKOKc and return are metered in a weight ratio of 87: 5: 8, mixed and ground to a particle size less than 0.1 mm. The mixture obtained is pelletized. into granules 10–30 mm with simultaneous moistening up to J0%, the resulting mixture of moisture inside the granules, leading to an increase in the gas-dynamic resistance of the layer and a decrease in the yield of the effective product, which reduces the productivity to the level of known processes.

Increasing the height of the top layer of granules more than 50 mm is impractical, since neither the yield nor the productivity of the process increase.

Example 2, The conditions of the process of sintering raw materials are similar to example 1, but with different heights of the lower layer,

layer-laid on the grate reformed from raw granules.

agglomeration marshny bar: the lower layer is formed from raw granules with a height of 270 mm, the upper layer is laid from an agglomerate fraction of 10-20 mm with a height of 40 mm o

Upon receipt of the charge under the incendiary furnace, Cox, contained in the charge, is ignited by a coolant with a temperature of 1200 ° C under vacuum under the grate

The admissible total height of the raw material loaded onto the grate grate of the sintering cloth is 350 mm (a bed of raw granules + agglomerate bed). Reducing the height of raw granules of less than 250 mm leads to a reduction in specific productivity.

150-300 mm. waters, art. Duration of treatment with coolant 5 min. Then, the charge is continued to be sintered with about ™ through ce through atmospheric air under vacuum at 300-600 mm of water under the grate, Art. The resulting specimen was crushed to a particle size of not more than 200 mm and then cooled in a straight cooler by blowing atmospheric air. The cooled ag-35 is analogous to Example L, but the lomerate is used for the second time being crushed and a different agglomerate with a particle size of JO-70Mi 4 is separated. The fraction with a particle size less than 10 mm after crushing returns to the head, 40

The yield of sinter in the process is 9J%,

The specific productivity of the sinter machine is 0.83.

According to the prototype, the yield of agglome se-45 agglomeration machine is 10 ra to, the specific production is 30 mm. With an increase in size, shuffle up the sintering machine to 0.6,

The dependence of the yield of the agglomerate and the productivity of the process on the size of the upper layer of the mixture of raw granules of less than 10 mm is reduced as set out in Table 3, the gas permeability of the layer and the corresponding process are as follows.

: ovate raw material.

The dependence of the yield of agglomerate and the productivity of the process on the granulometric composition of the pelletized material is presented in Table 3.

As can be seen from the table. the optimal size of raw granules served in

granules greater than 30 mm are reduced specific process performance at high output. When reducing the size of the data given in Table 1, it follows that the optimum height of the upper layer of the agglomerate is in the range of 25-50 mm. At the height of the layer; agglomerate below 25 mm, it is possible to destroy the top layer of raw granules due to the increase in the heating rate and, accordingly, rapid evaporation. The dependence of the yield of agglomerate and the productivity of the process on the size of the layer of raw granules is presented in Table 2,

As can be seen from Table 2, the optimum height of the lower layer of raw granules is 250-290 mm. Increasing the height of the lower layer of more than 290 mm is impossible due to the design features of the sintering machine.

The total height of the feedstock loaded onto the grate sintering grate is 350 mm (bed of raw granules + agglomerate). Reducing the height of raw granules of less than 250 mm leads to a reduction in specific productivity.

are analogous to example L, but different particle sizes are used.

logical example of L, but apply the granular composition of ok

PRI me R 3. The conditions of the process

are analogous to example L, but different particle sizes are used with the eye

: ovate raw material.

The dependence of the yield of agglomerate and the productivity of the process on the granulometric composition of the pelletized material is presented in Table 3.

As can be seen from the table. the optimal size of raw granules served in

sintering machine, 10-30 mm. When increasing the size of

raw granules less than 10 mm decrease the gas permeability of the layer and the corresponding granules more than 30 mm decrease the specific productivity of the process at high output. When decreasing the exchange rate, the specific productivity of the process.

Thus, the proposed technical solution allows for 0.01-0.1 t / m.h and 9-14% increase in the productivity of the process and the yield of sinter in comparison with the known values.

Claims (1)

Invention Formula The method of agglomeration of phosphate raw materials, including its mixing with return and fuel, wetting and pelletizing of the charge, two-layer loading of the pelleted charge onto the grate of the sintering machine, its ignition and burning, followed by crushing and cooling of the cake, so that As the product product code and process performance are concerned, the charge is pelletized to a granule size of 10–30 mm, the pelleted charge is loaded with a layer of 250–290 mm in height, onto which sinter is laid with a layer of 25–50 mm. Table 1 Table 3