KR101620722B1 - Storage Tank of Recycling Wastewater and Valuable Metal Hydrometallurgical Facility Comprising the Same - Google Patents

Abstract

The present invention relates to a wastewater storage tank for collecting wastewater generated in a wet smelting process of an effective metal and a wastewater storage tank for separating the wastewater storage tank into an upper portion and a lower portion and including a separable plate that can be opened and closed, And a wastewater storage tank capable of selectively discharging wastewater containing sediment precipitated in the lower part thereof.
According to the present invention, it is possible to provide a device for recycling wastewater generated in the smelting wet process of an effective metal, thereby reducing the waste water treatment cost, and consequently, reducing the operation cost of the process.

Description

Technical Field [0001] The present invention relates to a wastewater storage tank and an effective metal smelting facility including the same,

The present invention relates to a wastewater storage tank and an effective metal wet smelting apparatus including the same, and more particularly, to an apparatus and a control method for reducing waste water treatment costs by recycling wastewater generated in a wet smelting process of an effective metal.

Nickel-containing ores include limonite and saprolite. Nickel is recovered by wet smelting from these ores by depositing nickel ore and depositing nickel ore And the HEAP method.

On the other hand, in order to effectively leach nickel from these ores, HPAL (High Pressure Acid Leaching) method in which nickel is recovered by dissolving in an acid in an autoclave under high temperature and high pressure has been proposed. According to the HPAL method, it is possible to leach at least 90% of nickel within 2 hours, which is a representative method of nickel wet smelting. Examples of techniques for recovering nickel by the HPAL method include Korean Patent Laid-Open Publication No. 2007-7020915 and Japanese Laid-Open Patent Publication No. 2010-031341.

On the other hand, as disclosed in Korean Patent Laid-Open Publication No. 2009-0031321, a nickel-containing raw material is subjected to hydrogen reduction, nickel is leached with an acid, and another reducing raw material is reduced to a precipitation seed (SEED) Thereby recovering the ferronickel.

However, these methods do not disclose a method for effectively treating the cooling water used in the nickel smelting process, and conventionally, all the cooling water is used after wastewater treatment. At this time, when the amount of the recovered wastewater is large, it is difficult to treat the entire wastewater, and the disposal cost of the recovered wastewater is increased.

The cooling water used for the smelting and wetting process of the effective metal is wastewater treated in the entire amount once. The recycling of such wastewater reduces the costs of wastewater treatment and, consequently, the cost of operating the process.

The present invention relates to a wastewater storage tank, comprising a wastewater storage tank for collecting wastewater generated in a wet smelting process of an effective metal, and a separation plate for separating the wastewater storage tank into an upper portion and a lower portion and being capable of opening and closing, The wastewater containing the precipitate precipitated in the lower part of the wastewater storage tank can be selectively discharged.

And the separator plate can be opened toward the upper side of the wastewater storage tank.

And a discharge pipe for discharging waste water containing the sediment to the lower part of the waste water storage tank.

And a valve connected to an upper portion of the discharge pipe to open and close the discharge pipe.

And an input pipe connected to an upper portion of the waste water storage tank for inputting wastewater generated in a wet smelting process of an effective metal.

The present invention relates to a wet smelting plant for an effective metal, comprising a reduction furnace for reducing ore containing an effective metal to produce reduced light; A tentrum for slurrying the reduced light with water; An immersion tank for leaching an effective metal from the reducing optical slurry by hydrochloric acid to obtain an immersion liquid containing effective metal ions; Liquid separating means for separating the leaching solution from the leaching residues and a sedimentation tank for obtaining an precipitation cake by precipitating an effective metal from the leaching solution from which the leaching residue has been removed, wherein the cooling water used for cooling the reducing furnace is stored The present invention provides an effective metal wet smelting plant including a wastewater storage tank.

Wherein the effective metal wet-smelting facility includes a transfer pump at least one of between the reducing furnace and the furnace, between the furnace and the settling tank, and between the settling tank and the solid-liquid separating means, The cooling water used for the cooling water may be stored.

The effective metal smelting facility may include at least one water tank for washing the leaching residues, and the wastewater storage tank may store the washing water washed by the water washing tank.

The wastewater stored in the wastewater storage tank may be reused as at least one of the slurry, the reducing furnace cooling water, the transfer pump cooling water, and the water washing water.

According to the present invention, the waste water generated in the smelting wet process of the effective metal is recycled, thereby reducing the waste water treatment cost and consequently reducing the operation cost of the process.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a configuration diagram showing an example of a wastewater storage tank for a wet smelting process of an effective metal; FIG.
2 is a structural diagram showing an example of an effective metal wet-smelting facility including a wastewater storage tank.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.

Generally, when recovering an effective metal from an ore containing an effective metal by wet smelting, the ore is reduced and then the effective metal is leached by an acid to obtain an extract, which is recovered by precipitating an effective metal from the leach .

A method of recovering nickel from nickel-containing ores by wet smelting as an example will be described in detail. As described above, the nickel-based smelting is a process of reducing the oxidation light, a leaching step of leaching the effective metal from the ore by dissolving the reducing light in the acid, a precipitation step of precipitating the effective metal from the leaching solution obtained by the leaching step .

In the reduction step, hydrogen, which is a reducing gas, is fed to the reducing furnace 31 to reduce nickel and iron present in the oxidized state in the nickel ore. When nickel ore is reduced by using hydrogen reduction gas, reduced light is generated. At this time, the reduction process is performed in the temperature range of 550-950 ° C. In order to maintain the temperature range of the reducing furnace, cooling water may be supplied to the reducing furnace.

When the reduction light obtained by the reduction process is exposed to the air, there is a possibility of explosion due to rapid oxidation. In order to block the air, the reduction light is immersed in water in a sealed storage tank 33 Slurry. At this time, a large amount of water is used for slurrying the reduced light.

The reduced optical slurry is supplied to the sedimentation tank 35 by operating the pump 34. At this time, the pump is rotated at a high speed, and heat is generated in the bearings of the pump, and a large amount of cooling water is used to suppress the heat generation.

Next, an acid such as hydrochloric acid or sulfuric acid is added to the slurry, and an effective metal such as nickel and iron is leached from the reduced light to obtain a leach solution. And separating the leaching solution from the leaching residue by solid-liquid separation after the leaching step. The solid-liquid separation means (37) is not particularly limited, but a means such as a filter press can be applied to recover the whole amount of the leaching solution containing the effective metal as much as possible.

Although the leachate from which the leaching residue has been removed can be recovered by the solid-liquid separation as described above, since effective metal components such as nickel ions may remain in the leaching residue, it is preferable to further recover them. Thus, the leaching residues may be washed with water in the water treatment tank 38. Since the wash water washed by the washing liquid contains nickel ions, it can be recovered and used in the precipitation process together with the leaching solution.

On the other hand, the leached residue after the water rinsing may be further subjected to a washing process in the water bath 38, if necessary, to further recover unrecovered nickel ions. However, since the washing liquid recovered by this method contains a small amount of nickel ions, it is more preferable to use the reducing water for slurrying the reducing light rather than mixing with the leaching solution.

After the washing step of washing the leached residue as described above, it is preferable to wash the water-containing tank 38 with water in order to remove foreign matters remaining in the water-containing tank 38.

On the other hand, in the leaching solution, components such as Al, Si, Cr and the like are leached together with the effective metal by the acid in the leaching step as a component contained in the raw ore. And further acts as an impurity which lowers the purity of the precipitation cake. In order to remove such impurities, a pH adjusting agent is preferably added to precipitate the impurities as described above. Such a pH adjustment may be performed immediately after the leaching step to remove the precipitate with the solid leaching residue by solid-liquid separation, or the pH adjustment process may be performed on the leach after removing the leaching residue by solid-liquid separation.

Next, the precipitation reaction in which nickel is precipitated in the leaching solution by applying the reducing light to the sedimentation tank 41 can be performed. At this time, this precipitation step may be performed by replacing iron in the reducing light with nickel ions in the leaching solution. The precipitate thus obtained is recovered by solid-liquid separation, whereby the nickel cake 44 can be obtained.

On the other hand, the precipitation filtrate contains a large amount of iron ions and chlorine ions as an acid used for leaching, and hydrochloric acid and iron can be recovered by treatment such as crystallization and roasting. A detailed description thereof will be omitted.

As described above, in the process of recovering the effective metal by wet smelting, a large amount of water is used, which causes an increase in the cost of the process. As described above, cooling water is used not only for cooling the reducing furnace 31 but also for cooling the pumps 32, 34, 36, 39 and 42, in addition to the water used in such a process. For example, although the pump 34 is illustrated for transferring the reduced optical slurry to the leaching tank, a pump is used to transfer the raw material between the respective steps. In order to cool these pumps, it is also necessary to use cooling water have. Further, water is also used for cleaning the water tank 38.

All of these cooling water and washing water are being discarded, and it is necessary to recycle such wastewater. Accordingly, the present invention provides a wastewater storage tank 45 for collecting wastewater generated and discarded in such a process.

The wastewater supplied to the wastewater storage tank 45 provided by the present invention includes a solid matter floating in the wastewater. Such a wastewater is desirably removed because it may degrade process efficiency. 1, the waste water storage tank 45 is divided into an upper portion 10 and a lower portion 20 and includes a separable plate 30 which can be opened and closed. After the wastewater is collected in the wastewater storage tank 45 by the separation plate 30, the solid matter contained in the wastewater is precipitated. Thereafter, the separation plate 30 is closed to separate the wastewater into the lower part including the precipitate It can be divided into upper parts that do not contain solid matter.

At this time, the wastewater discharge pipe 300 is provided in the lower portion 20 of the wastewater storage tank to selectively discharge and dispose wastewater containing the lower deposit through opening and closing of the valve 200, The wastewater can be recycled by supplying the upper purified wastewater to a facility where water supply is required.

Preferably, the separator 30 is openable to the upper portion 10 of the waste water storage tank as shown in FIG. It is possible to prevent the sediment from re-floating due to the flow of wastewater during opening and closing of the separation plate 30 by making the separation plate 30 open upward.

The wastewater collected in the wastewater storage tank 45 is not particularly limited as long as the wastewater is generated and discarded during the wet smelting process. For example, ) Cooling water, water (38) cleaning water, and the like.

The wastewater collected in the wastewater storage tank 45 may be subjected to a purification process to generate purified water from which suspended substances have been removed. The purified water discharged from the wastewater storage tank 45 may be used as a water and leach residue washing liquid used for slurrying or the like by being put into the washing tank 33 and the water washing tank 38. The cooling water of the reducing furnace 31, the cleaning water of the water treatment tank 38 and the pump cooling water 32, 34, 36, 39, 42 and the like can be used for cooling or cleaning the facility.

As a result, the wastewater generated in the effective metal wet smelting process can be purified and used again in the process, thereby reducing the wastewater treatment cost, and consequently reducing the operation cost of the process.

It will be appreciated by those skilled in the art that the wastewater storage tank 45 of the present invention can be applied to the nickel wet smelting process as well as other facilities generating wastewater to contribute to water consumption reduction will be.

10: Wastewater storage tank top
20: Wastewater storage tank bottom
30: separator plate
100: input tube
200: Valve
300: discharge pipe
31: Reduction furnace
32, 34, 36, 39, 42: pump
33:
35: Deposition chamber
37, 40, 43: solid-liquid separation means
38:
41: Seokjo
44: Nickel cake
45: Wastewater storage tank

Claims (12)

delete delete delete delete delete A reducing furnace for reducing ore containing an effective metal to produce reduced light;
A tentrum for slurrying the reduced light with water;
An immersion tank for leaching an effective metal from the reducing optical slurry by hydrochloric acid to obtain an immersion liquid containing effective metal ions;
Liquid separating means for separating the leaching solution from the leaching residues;
A sedimentation tank for precipitating an effective metal from the leach solution from which the leaching residue has been removed to obtain a precipitation cake;
A pump provided in at least one position between the reducing furnace and the furnace furnace, between the furnace furnace and the annealing furnace, and between the leaching furnace and the solid-liquid annealing furnace; And
And a waste water storage tank in which the used cooling water of the reducing furnace and the cooling water used for cooling the pump are stored,
The wastewater storage tank includes:
A wastewater storage tank for collecting wastewater generated in a wet smelting process of an effective metal;
And a separation plate that separates the wastewater storage tank into an upper portion and a lower portion to prevent mixing of the wastewater contained in the upper portion and the precipitate contained in the lower portion and opens the upper portion of the wastewater storage tank,
Wherein the wastewater containing the precipitate settled in the lower part of the wastewater storage tank after the closure of the separation plate can be selectively discharged.
delete The effective metal smelting plant according to claim 6, wherein the effective metal smelter includes at least one water tank for washing the leaching residues, and the wastewater storage tank stores washing water washed by the water bath.
The effective metal wet-smelting facility according to claim 6 or 8, wherein the wastewater stored in the wastewater storage tank is reused as at least one of the slurry of the above-mentioned equation, the reducing furnace cooling water, the pump cooling water, and the wash water.
7. The wet metal smelting facility according to claim 6, further comprising a discharge pipe for discharging the wastewater containing the sediment to the bottom of the wastewater storage tank.
11. The apparatus of claim 10, further comprising a valve connected to an upper portion of the discharge pipe to open and close the discharge pipe.
The apparatus according to claim 6, further comprising an inlet pipe connected to an upper portion of the waste water storage tank for inputting wastewater generated in a wet smelting process of an effective metal.

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