SU1333417A2 - Method of dressing natural resources - Google Patents

Abstract

The invention relates to the field of mineral processing using flotation and is intended for the processing of mining ore raw materials. The goal is to increase the extraction of the useful component and the quality of the concentrate. To do this, carbonation of mineral raw materials is carried out at a pressure that will ensure maximum concentrate yield during flotation. The pressures at which air is injected into the dry mineral raw materials are determined from the following relationship: P 0, d, where P is the saturation pressure of the raw material, MPa; d is the specific mass, p-porosity,%. At the subsequent depressurization, air bubbles released from the pores are fixed on the surface. Then they coalesce with air puffed out of the water, providing a lifting force for the mineral particle, 1 tab. with S CO 00

Description

113

The invention relates to the enrichment of minerals using flotation and can be used in the processing of mining ore raw materials.

The purpose of the invention is to increase the extraction of the useful component and the quality of the concentrate.

The pressures at which air is injected into the dry mineral raw materials are determined taking into account the specific gravity and porosity with respect to coal by empirical dependence

55.8 -i, Jcl

P 0,63d P

G. 1

where P is the feed saturation pressure,

MPa;

d - specific mass, P - porosity,%. The essence of the method lies in the fact that the carbonation of mineral raw materials should be carried out at a certain pressure, which will ensure the maximum yield of the concentrate during flotation. As the saturation pressure of the minerals increases, the amount of air that is pumped into the pores of the mineral and dissolves in the liquid increases. With the subsequent release of pressure, the air bubble released from the pores is fixed on the surface, then coalesced with air bubbles released from the water, thereby providing a lifting force to the mineral particle. A particle during its ascent overcomes the Stokes force of resistance of a fluid and its own force of gravity, therefore the volume of a bubble on its surface must be such that the Archimedean force of air bubbles is equal to or greater than indicated above. Gravity depends on the specific gravity of the particles, and the porosity determines the volume of air that can be localized inside the particle at a certain pressure. Thus, theoretically, for successful flotation of particles with given values of porosity and specific gravity, it is necessary to maintain a certain pressure for us. An increase in porosity and a decrease in the specific gravity of the particles suggests a decrease in the saturation pressure of the mineral particles and vice versa.

Example, Coal brand QOL has the following; its characteristics: P 9 ,, d 1.2 mg / m-.

Substituting these values into the formula described, we obtain the value of the saturation pressure of carbon with air

five

0

five

0

m 5 0

17.2

P 0.28 MPa.

Thus, in order to achieve the maximum value of extraction of a given coal by the proposed method, it is necessary to pre-inflate air at a pressure not lower than 0.28 MPa.

The table lists the results of experimental studies on the enrichment of coal from various grades of the Donetsk deposit with their preliminary aeration at different pressures.

The table shows that the maximum extraction of coal is achieved under the condition that the mineral raw material is pre-saturated with air at a pressure equal to or higher than the calculated value.

The proposed method for selecting the parameters of the containment of the beneficiation process has been effectively applied to the flotation of coal in order to separate it from pyrite sulfur. Unlike coal, pyrite is not a porous mineral, therefore, when enriched by the proposed method, in the absence of reagents, pyrite must remain in the tails. The experiments were carried out on a pyritized corner of the K brand of the Karaganda Gorge, yeni.

Due to the choice of optimal conditions, a high degree of separation of coal from pyrite was achieved: 94% of the pyrite remained in the tails, and in the concentrate the pyrite content decreased to 0-, 7%. This makes it possible to use this method for the desulfurization of coal.

Claims (1)

Invention Formula The method of enrichment of minerals by the author "St. No. 1233332, characterized in that, in order to increase the extraction of the useful component and the quality of the concentrate, the amount of pressure at which air is injected into the dry mineral raw materials is determined by the formula 25.8 -1.3 s1 P 0,63d -P 5,5L P is the pressure at which air is injected into dry minerals, MPa; d is the specific mass of the extracted component, P - porosity of the extracted component,%. Process parameters EIIJilZ II I IIIIZ EIIi I-L.L iPressure saturated | Nla 0.10.13 0.20.15 0.21 0.3 0.4 0.54 0.60.80.98 1.0 Extract, Z 92.0 98.0 98.0 88.0 96.0 96.5 87.0 95.0 95.0 85.0 93.0 93.5 . Estimated value Compiled by V.Shubina Editor M.Petrova Tehred M.Hodanich Order 3901/9 Circulation 511, Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk .nab., d.4 / 5 Production and printing company, Uzhgorod, Projecto st., 4 Coal grades QOL OS Proofreader E.Roshko