SU1678870A1 - Device for stepped countercurrent leaching of dispersed materials - Google Patents

Abstract

The invention relates to hydrometallurgy, in particular to the design of devices for opening the raw material by leaching. The purpose of the invention is to increase the productivity of the process. The device comprises a vertical cylindrical body 1, expanding in the upper part 2 and divided by height by tapering tsars 3, pipe 6-9 for supplying liquid reagent, discharging the condensed product, draining the final solution and loading the original solid pulp, respectively. The device is equipped with gas outlet pipes 4 with shut-off valves 5 for regulating the gas exhaust rate located between the upper and lower ends of each bark 3. The productivity of the process increases by 3-4 times. 4 tab., 1 Il. Iffx "

Description

Reagent 8

V

Gas

Condensed product

The invention relates to hydrometallurgy, in particular to the design of devices for opening the raw material by leaching.

The purpose of the invention is to increase the productivity of the process,

The drawing shows the proposed device.

The leaching device comprises a housing 1 with an extension in the upper part 2, divided into sections with hinges Z. In the side wall of the housing between the upper and lower sections of each bark there is a branch pipe 4 for exhausting gas, equipped with a shutoff valve 5 to regulate the rate of exhaust gas. In the lower section there is a pipe 6 for supplying liquid reagent and a pipe 7 for discharging the condensed product. In the upper section there is a nozzle 8 for removal of the final solution and a nozzle 9 for loading the initial pulp of solid matter; la

The device works as follows.

The pulp of the initial concentrate is continuously cooled through the pipe 9, the solid phase passes successively all sections of the housing from top to bottom, condenses in the lower section and is discharged through the pipe 7.

The initial reagent solution enters the body through the nozzle 6, successively passes through each section from bottom to top, creating a fluidized bed of solids and leaching it, clarified in the expanded part of the body and discharged through the nozzle 8. The linear velocity of the solution through a narrow section of each tsar does not less than enough to hold the solids in the section without rolling.

The gas released during leaching is collected in each section in a gas pocket formed by the barrel and the walls of the casing and discharged from the casing through the nozzle 4 at a constant rate.

Periodically, an increase in the gas exhaust rate is performed by means of shut-off valves 5. In this case, the linear velocity decreases in a narrow section of the pipe, the gas pocket is filled with the pulp to the required level. As a result, part of the solid phase is transferred by the force of gravity from the upper section to the lower section, and thus the solid phase is overloaded from the upper section to the lower section. Then, using stop valves 5, the gas exhaust rate is reduced to a constant value, the gas fills the gas pocket, and the linear velocity of the solution through a narrow cross section of the core increases to the same value.

Example 1. Leaching was carried out in a laboratory glass four-section column 1.2 m high, 0.035 m in diameter and 0.05 m in diameter of the expanded part. The height of each tsarg is 0.07 m, the diameter of the tsar narrow part is 0.0015 m. section at a distance of 0.02 m from the top

In the section of the barrels in the wall of the column there is a gas outlet pipe, equipped with a valve for adjusting the gas outlet rate. The raw material of the depletion furnace is used as the starting material.

5 crushed to a particle size of 75 microns (95%) and containing,%: iron 56; copper 8.4; Nickel 6.6 (Table 1). The matte is repulped in a solution of ferrous sulfate to a ratio of W: T of 1: 1 and continuously loaded with a pump in the

0 top section. A solution with a sulfuric acid concentration of 100 g / dm3 is pumped to the lower section of the column with the help of a pump and the waste solution is discharged from the top of the expanded part of the column. In the column

5 maintain the temperature. During leaching, hydrogen sulfide is released, which is removed from the gas pocket in each section at a constant rate beyond the column and absorbed by the solution

0 caustic soda. The overloading of solid from stage to stage is carried out periodically by increasing the gas removal rate when the valve is torn off.

5 The results of the experiments are given in Table 1.2, the results of matte leaching in Table 3; and pyrrhotite concentrate in table, 4,

In experiments with gas withdrawal from each section with an increase in productivity from 53 (experiment 1) to 118 g / h, the process is stable and similar results are obtained (extraction of iron into the solution, removal of solid into the drain). The actual productivity of the initial solid (taking into account the removal of solid into the drain) in experiment 2 was 112 g / h.

In experiments with gas withdrawal only from the oil section (as in the prototype) is maximum

0, the solids yield is 35 g / h (test 3). With an increase in the performance of the initial load up to 118 g / h (experiment 4), the removal of solid into the discharge and the actual performance sharply increase

5 solid remains at the same level of 35 g / h.

Thus, the removal of gas from each section allows to increase the productivity of the apparatus by three times.

The amount of dissolved iron in the column is calculated by multiplying the actual throughput by the iron content of the starting material by removing the iron into the solution. For example, for experiment 1 (Table 1): 52.5 x 0.56 x 0.98 28.8 g / h.

EXAMPLE 2 Leaching was carried out in a laboratory glass three-section column with a height of 0.6 m, a diameter of 0.029 m, and an enlarged part with a diameter of 0.06 m. The height of each bark was 0.05 m; 0015 m. In each section, at a distance of 0.015 m from the upper section of the barrels, in the wall of the column there is a branch pipe for exhausting gas, equipped with a valve for controlling the rate of discharge of gas. The starting material used is pyrrhotite concentrate with a particle size of 74 μm (95%), containing,% iron 50.5: copper 2.2; nickel 3,5; sulfur 29.7 (table 2). The pyrrhotite concentrate is repulped to the ratio G: T 1: 1 and is continuously loaded into the upper section. The initial sulfuric acid with a concentration of 110 g / dm3 is continuously fed to the lower section, the temperature in the apparatus is maintained at 95-98 ° C. During leaching, hydrogen sulfide is released, which is removed from the apparatus at a constant rate either from each section or only from the top section (as in

Note. The iron content in the original matte is 56%.

Note. The iron content in the original pyrrhotite concentrate is 50.5%,

 prototype). The overloading of the solid from section to section is carried out by periodically increasing the rate of removal of the gas.

As can be seen from Table 4, with the removal of gas from each section, the productivity of the apparatus increases (test 3) to 60 g / h (test 1), i.e. 4 times.

Thus, the use of the proposed device for conducting counter-stepwise leaching of dispersed materials provides an increase in productivity by 3-4 times compared with the prototype.

Claims (1)

Invention Formula A device for countercurrent stepwise leaching of dispersed materials in a fluidized bed with gas evolution, containing a vertical cylindrical body, expanding in the upper part and divided in height by conical tsars, and pipes for inlet and outlet of liquid reagent and solid material, characterized in that in order to increase the productivity of the process, it is equipped with gas branch pipes with shut-off valves for regulating the gas exhaust rate located between the upper and lower ends of each tsarg. Table 1 table 2 Table 3 Table 4