SU1581690A1 - Charge for sintering initial phosphate material - Google Patents

Abstract

This invention relates to a process for preparing phosphate raw materials for a process for producing phosphorus by an electrothermal method. The aim of the invention is to increase the specific productivity of the process and the strength of the product. The invention consists in that the charge for the agglomeration of phosphate raw materials additionally contains slag obtained by burning sludge producing phosphorus in the following ratio, wt.%: Coke 4.0-5.0

slag obtained by burning sludge production of phosphorus 2.5-5.0

phosphate raw materials - the rest is up to 100. 1 table.

Description

The invention relates to the technology of agglomeration and the thermal preparation of fine fractions of phosphate ore in the production of yellow phosphorus by the electrothermal method.

The purpose of the invention is to increase the specific productivity of the process and the strength of the product.

Example 1. The mixture is composed in the following combination of components, May. %:

Coke 4.0

Slag obtained by burning sludge production of phosphorus 5.0 Phosphate raw materials 91.0 The weight of the charge 33 kg, of which phosphate raw materials 30.03 kg, coke 1.32 kg, slag 1.65 kg.

The resulting mixture is mixed, moistened with water (including slag moisture) to a moisture content of 8%, pelletized,

they load the slug box from 0 400 mm and bake with the following parameters: the height of the loaded charge layer is 230 mm, ignition for 1.5 min at a temperature of the heat-transfer fluid of 1250 C, discharge under the grate 300 mm of water. and discharge during the subsequent sintering of 1200 mm water column. Vertical sintering speed of 16.5 mm / min. Total sintering time 13.939 + 1.5 15.439 min. The amount of this material is 29.41 kg, suitable agglomerate is 25.08 kg. The strength of the agglomerate on the yield of the fraction minus 5 mm after the test in the drum is 24%. The specific productivity of suitable sinter is 0.75 t / m2 h.

Dump slag from the combustion of phosphorus sludge in cyclone furnaces represent light blue crystals with the following chemical composition in wt.%: Pi Oj- 41.15 -44.0; SiOa 28-30; Cao

ate

thirty

3 X)

0.88-1.0; MgO 0.72-2.0; 0, J6-0.69; А1г030,55-1,00 ;, 10,19-12,15. Fractional composition: 3-8 mm-80%; H-t mm-20%.

The composition of the phosphorus sludge cuttings in the cyclone furnace contains silicon (Si) phosphate (Mg) and magnesium (Mg (PO) 3) magnesium metaphosphates and other metals: Ca (P03) 3; Na (P03) h; K (P03) h, which, in the wet state, are continuously hydrated with the release of free NER04. The latter vigorously interacts with the components of the phosphate raw material and in the course of calcination various phosphates of silicon, calcium, and magnesium are formed with the formation of a porous, agglomerate frame structure. As a result, the strength of the agglomerate increases, as well as the vertical speed of the process and its specific productivity.

Example 2 The mixture is composed in the following ratio, wt%:

Large-scale phosphate raw materials

stew 10-0 mm92,5

Coke trifle5.0

Slag obtained by burning sludge of phosphorus production2.5 The resulting mixture is mixed, moistened, pelletized, and sintered in Example 1. The vertical sintering rate is 15.8 mm / min, the specific productivity is 0.69 t / m "h. The yield of the fraction is 5 mm after the drum test is 26.0%.

The table shows the dependence of the process indicators on the content of the shp obtained by burning sludge from the production of phosphorus.

With the introduction of waste slag from the combustion of phosphorus sludge in cyclone

furnaces in the mixture in the amount of less than 2.5 wt.%. the vertical sintering rate decreases, respectively, the specific productivity decreases, the yield of the fraction of class minus 5 mm increases. The increase in the amount of slag in the charge of more than 5 wt.% Leads to a decrease in the vertical sintering rate due to the formation of a low-melting phase, therefore it is not advisable.

Thus, the proposed mixture can reduce the consumption of coke breeze by 23.1 - 27.3 wt.%, Increase the strength of the sinter to 24 - 26% (class yield - 5 mm), increase the vertical sintering rate to 17.2 mm / min. and, accordingly, to increase the specific productivity of agglomeration to 0.79 t / m-h g

In addition, when using slag obtained by burning sludge from the production of phosphorus, no agglomerate is diluted in the main component (Pr05).

Claims (1)

Invention Formula The mixture for the agglomeration of phosphate raw materials containing phosphate raw materials and coke, characterized in that, in order to increase the specific productivity of the process and the strength of the product, it additionally contains slag obtained by burning phosphorus sludge in the following ratio, wt.%: Coke , 0 - 5.0 Slag produced by burning sludge production of phosphorus 2.5 - 5.0 Phosphate raw materials Else up to 100