SU551246A1 - Method for agglomeration of phosphate rock - Google Patents

Description

(54) METHOD OF OKU SKOV ANIA OF PHOSPHORITE MITTLE

one

This invention relates to a process for preparing raw materials for the electrothermal production of yellow phosphorus.

There is a method of sintering phosphorite fines by sintering it on the grate due to the burning of fuel that has previously been moved with fines and air through the sinter layer. In this case, fines of metallurgical coke or coal are used as fuel, which are distributed evenly over the entire height of the phosphate rock layer. The disadvantages of this method are low specific unit capacity - 0.5 t / m h. and high fuel consumption - 6.5 weight. % one .

There is also known a method for the agglomeration of fines by moistening it and mixing it with solid fuel, pelletizing, and a two-layer charge of a mixture with a mass of the lower layer up to 75% by weight of the mass of both layers of the mixture followed by sintering. In this case, solid fuel is introduced only into the lower layer, the weight of which is 27-75 weight. % of the total mass of ore, and the heating of the upper layer is carried out by the products of gas combustion. The disadvantages of this method are also low productivity and high fuel consumption 2.

In order to reduce the consumption of solid fuels and increase the productivity of the process, 25.0-40.0 weights have been proposed. % solid fuel with a particle size of 1-3 mm of the total amount of solid fuel to be injected when mixing it with phosphate rock, and 60.0-75.0 wt.% solid fuel with a particle size of 0.1-1.0 mm to roll onto the surface granules of the charge for 1-3 minutes at the end of its pelletizing, at the same time in the lower layer serves to 10-20 weight. % fuel less than the top.

The proposed method allows to increase the specific productivity of the installation to 0.75 t / m hour. and reduce fuel consumption by 25.0-30.0%

PRI me R. Karatau phosphoric fines with a particle size of 0.0-10.0 mm are mixed with solid fuels. In this case, the mixture is prepared separately for each layer. The composition of the mixture for the upper layer, wt.%:

Phosphoritic fines Karatau56,0

Return 30,5

Coke breeze (3-1 mm) 2.2

Coke breeze (0.0-1.0 mm)

Claims (2)

3.3 Water 8.0 The mass of the lower layer is 75% of the mass of their layers. The composition of the charge for the lower layer consists of the following components, wt.%: Phosphoritic fines Return Coke fines (3-1 mm) Coke fines (0.1-1.0 mm) Fuel size 1-3 mm is fed into the mixture before mixing. The stirred mixture is moistened with water for 2 minutes on a plate granulator with a diameter of 1000 mm. Then, on the formed charge granules, fuel of a fraction of 0.0–1.0 mm is put in place for 1.5 minutes. After supplying the fuel, the charge is pelleted for another 1 minute to strengthen the granules. The mixture is loaded in layers into an aglochash with a diameter of 400 mm, ignited, and then sintered under a vacuum under a grate of 1000 mm water column. The plant's specific capacity was 0.75 t / mh, fuel consumption was 4.79% by weight, and the fines yield was 0.0–5.0 mm after testing the sinter in the drum — 36.0. DETAILED DESCRIPTION OF THE INVENTION A method for the agglomeration of phosphorus fines by moistening and daring with solid fuel, pelleting and bilayer loading of the charge on the sintering grid, followed by sintering, characterized in that, in order to reduce the consumption of solid fuel and increase the productivity of the process, 25.0-40.0 weight. % solid fuel with a particle size of 1-3 mm of the total amount of solid fuel is injected when mixed with phosphate rock, and 60.0-75.0 wt. % solid fuel with a particle size of 0.0-1.0 mm is applied to the surface of the pelletized mixture for 1-3 minutes, while 10-20 weight is fed to the bottom layer. % fuel less than the top. Sources of information taken into account in the examination; 1. Shymnodinnikov AJB. Works UNIHIM a, vsh. 19, L, 1970, p. 40-53. 2. The author's certificate number 377361, M. Cl. C 22 V 1/14, 06.21.1973 (prototype).