SU1386557A1 - Method of sintering phosphate raw materials - Google Patents

Abstract

This invention relates to a process for preparing phosphate raw materials for electrothermal sublimation of phosphorus. The aim of the invention is to reduce the lyleunos from the sintered layer. The method consists in mixing phosphate raw materials with flux and coke, moistening and pelleting the charge, loading the sintering machine onto the grate, igniting it with a gaseous heat carrier that is sucked from the top through the charge layer, with an increase in vacuum under the grate from 20 to 190 mm of water, sintering during the first 5-7 minutes with higher dilution under the grate from 141 to 850-990 mm water column, replacing the coolant with air with increasing vacuum pressure during the remaining time of sintering 1100 - 1300 mm water column and the subsequent crushing and cooling of the cake. 1 tab. c (O (L

Description

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This invention relates to a process for preparing phosphate raw materials for electrothermal sublimation of phosphorus.

The purpose of the invention is to reduce dust from the Sinter bed.

Example 1. A mixture containing, in wt.%: Phosphate raw materials (phosphorite 10-0 mm) 86; phosphatized silicon 8; Coke 6 is mixed, moistened, rolled up, laid on the grate, lit with coolant with a temperature of 1200-1250 C, and for 2–2.5 min at the speed of its suction through a layer of 0.16-0.18 s / s , caused by a constant increase in vacuum under the grate from 20 to 190 mm of water column, is sintered with the replacement of the coolant on the air and in

If the claimed period (5-7 min) of the change in speed (O, 19-0.30 nm / s) of air supply to the layer from the start of sintering after ignition of the charge will decrease to 4 min or increase {1 to 8, the agglomeration process Do not exceed limestone level. Productivity is 0,540-0,530 t / m h, the yield of fines from 5-0 mm from sinter after the drum is 28-29%, the content of fine fractions of the charge in process gases is 1200 mg / nms.

If in the range (0.19-0.30 nm / s) of a gradual increase in the rate of air supply to the layer within 5 to 7 minutes from the start of sintering after ignition, reduce the lower limit to 0.218 or increase the upper limit to

the first 5 minutes after ignition, the constant is n-20 0.31 nm / s, the indicators of the sintering process do not exceed a known level. Productivity is 0.53, the output of fines from the sinter after the drum is 29%, the content of the fine fractions of the charge in process gases is 1200 mg / nm3.

The table presents data on the amount of dust in gases, depending on the time of the start of sintering and vacuum.

but increase the rate of air suction through the layer from 0.19 to 30 nm / s due to a constant increase in the vacuum in the specified period from 191 to 850 mm water column, in the rest of the sintering period under the grate. vacuum 1100-1300 mm water column The resultant powder is crushed, cooled and the pressure is precipitated with separation of a fraction of 8-0 mm.

The specific productivity is 0.545 t / mh, the yield of the fraction is 5-0 mm from the sinter after the test in the drum is 28%, the content of dummy in process gases is 700 mg / nm.

According to a known method during sintering under the grate. lattices create a vacuum of 1100 - 1300 mm of water. At the same time, the rate of air filtration through the charge layer during the first 5–7 min of sintering varies from 0.5 to 0.18 nm / s. This is due to the fact that an increase in the rate of air filtration leads to a layer compaction (layer shrinkage of 20%), thus increasing its gas-dynamic resistance, which leads to a deterioration of the sintering process as a whole. In addition, as a result of compaction, the granules formed from fine materials are destroyed, the amount of dries in the sinter gas rises to 1200 mg / nm.

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Claims (1)

Invention Formula The method of agglomeration of phosphate raw materials, including its displacement with flux and coke, wetting of the charge, its pelletizing, loading onto the grate of the sintering machine, ignition of the charge with gaseous coolant, sucked from above through the charge layer under the grate from 20 to 190 mm. Art., its sintering with the replacement of the coolant on the air with a vacuum under the grate 1100-1300 mm water.st. followed by crushing and cooling the cake, characterized in that, s. in order to reduce dust from the sintered layer, during the first 15-7 mi: s sintering after ignition of the charge, the vacuum under the grate is twisted from 190 to 850-990 mm water column. five 0 five 0 Invention Formula The method of agglomeration of phosphate raw materials, including its displacement with flux and coke, wetting of the charge, its pelletizing, loading onto the grate of the sintering machine, ignition of the charge with gaseous coolant, sucked from above through the charge layer under the grate from 20 to 190 mm. Art., its sintering with the replacement of the coolant on the air with a vacuum under the grate 1100-1300 mm water.st. followed by crushing and cooling the cake, characterized in that, s. in order to reduce dust from the sintered layer, during the first 15-7 mi: s sintering after ignition of the charge, the vacuum under the grate is twisted from 190 to 850-990 mm water column.