Iron removal device in zinc hydrometallurgy production

Abstract

The utility model discloses an iron removal device in zinc hydrometallurgy production, which is characterized in that a gas outlet is arranged on the upper side of a boiling roasting furnace, a discharge port is arranged on the lower side of the boiling roasting furnace, a tail gas treatment device further comprises an exhaust pipe, a tail gas neutralization absorption box, a negative pressure pump and a tail gas absorption tower, the negative pressure pump is respectively connected with a gas outlet of the boiling roasting furnace, the tail gas neutralizing and absorbing box and the leaching box through exhaust pipes; the tail gas absorbing and washing box is connected with the tail gas absorbing tower through an exhaust pipe; the leaching device further comprises a discharging pipe, a material pumping device, a leaching box and a thickener, the material pumping device is connected with a discharging opening in the lower side of the boiling roasting furnace and the leaching box through the discharging pipe, and the leaching box is connected with the thickener through the discharging pipe. The device disclosed by the utility model has the functions of simple structure and convenience in operation, combines pyrogenic process and wet process leaching residue treatment processes, not only ensures the zinc recovery rate and the iron leaching rate, treats tail gas, but also avoids environmental pollution.

Description

Technical Field

[0001] This utility model patent belongs to the technical field of impurity removal equipment, and specifically relates to an iron removal device in hydrometallurgical zinc production. Background Art

[0002] Iron removal is an important issue in wet zinc smelting. The processes of roasting, leaching, purification, electrowinning and casting in wet zinc smelting are basically the same. The main difference lies in the use of different iron removal methods, which leads to different wet zinc smelting processes: 1. Conventional method: After the zinc concentrate is roasted, neutral leaching and low-acid leaching are used. The zinc leaching rate is about 70%, the slag rate is about 60%, and the iron remains in the leaching slag. Due to the high zinc content in the leaching slag, this method generally uses a rotary kiln to volatilize and recover zinc oxide, and the iron is removed by the kiln slag. The kiln slag contains about 1-2% zinc and about 25-30% iron. The iron slag produced by this method is solidified slag treated by pyrometallurgy. The heavy metal ions are well solidified, which is convenient for slag storage and sales. However, this method has the disadvantages of high energy consumption, large loss of refractory materials and low concentration of SO 2 Problems such as the need to treat flue gas lead to high production costs; 2. High-temperature high-acid method: After the zinc concentrate is roasted, high-temperature high-acid leaching is adopted. The zinc leaching rate is about 96-98%. Most of the zinc is leached into the solution. At the same time, a large amount of iron is also leached into the solution. Generally, the leaching solution contains 20-30g / l of iron. The iron entering the leaching solution needs to be separately de-ironed to meet the purification requirements. For this reason, various de-ironing methods have been developed.

[0003] In total, they can be summarized into two categories: one is the fire method represented by the conventional method to treat the leaching slag. The disadvantage of this method is that the zinc leaching rate is low, and a rotary kiln is required to treat the leaching slag to recover zinc oxide. It has high energy consumption and the need to treat tail gas, resulting in waste of resources and high production costs. The other is the wet method represented by the high-temperature and high-acid method to treat the leaching slag. The disadvantage of this method is that it requires special slag yards for storage, which is not environmentally friendly.

[0004] Therefore, this paper proposes an iron removal device in hydrometallurgical zinc production. Utility Model Content

[0005] In order to solve the above problems, the utility model provides an iron removal device in wet zinc smelting production, which has a simple structure and is easy to operate. It combines the pyrometallurgical and wet methods to treat the leaching slag process, which not only ensures the zinc recovery rate and the iron leaching rate, but also treats the tail gas and avoids environmental pollution.

[0006] In order to achieve the above technical effects, the utility model is implemented through the following technical solutions: an iron removal device in wet zinc smelting production, including a boiling furnace, a tail gas treatment device, and a leaching device. The side of the boiling furnace is connected to the leaching device and the tail gas treatment balance device through a pipeline. The pipeline also includes an exhaust pipe and a discharge pipe. The boiling furnace is provided with an air outlet on the upper side and a discharge port on the lower side. The tail gas treatment device also includes an exhaust pipe, a tail gas neutralization absorption box, a negative pressure pump, and a tail gas absorption tower. The negative pressure pump is respectively connected to the air outlet, the tail gas neutralization absorption box, and the leaching box of the boiling furnace through the exhaust pipe, and the tail gas absorption washing box is connected to the tail gas absorption tower through the exhaust pipe; the leaching device also includes a discharge pipe, a pumping device, a leaching box, and a thickener. The pumping device is respectively connected to the discharge port and the leaching box on the lower side of the boiling furnace through the discharge pipe, and the leaching box is connected to the thickener through the discharge pipe.

[0007] Preferably, a one-way valve is installed on the exhaust pipe.

[0008] Preferably, the leaching box is provided with leaching liquid.

[0009] Preferably, a feed pump is installed on the discharge pipe between the leaching tank and the thickener.

[0010] Preferably, a neutralizing liquid washing liquid is arranged in the exhaust gas neutralization absorption box, an exhaust screen head is arranged at the end of the exhaust pipe in the exhaust gas neutralization absorption box, and a plurality of exhaust holes are arranged on the exhaust screen head.

[0011] The utility model has the following beneficial effects: the device has a simple structure and is easy to operate, and combines the pyrometallurgical and hydrometallurgical processes for treating leached slag, thereby ensuring the zinc recovery rate and the iron leaching rate, treating the tail gas, and avoiding environmental pollution; when in use, the leached slag and the leaching liquid in the hydrometallurgical zinc smelting process can be put into a boiling furnace for roasting, and the tail gas generated by the roasting can be discharged into the tail gas treatment device through an exhaust pipe for treatment, and the precious metals in the tail gas can be recovered; the slag after roasting is discharged into the leaching box through the pumping device for neutralization and reduction reaction, and finally the precipitate precipitated in the leaching box is pumped into the thickener for concentration and separation through the pumping pump, so as to obtain iron slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for describing the embodiment will be briefly introduced below. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

[0013] Figure 1 It is the front view of the utility model;

[0014] Figure 2 It is a cross-sectional schematic diagram of the main view of the utility model;

[0015] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0016] Fluidized bed roasting furnace 1, exhaust pipe 2, discharge pipe 3, gas outlet 4, discharge outlet 5, tail gas neutralization absorption box 6, negative pressure pump 7, tail gas absorption tower 8, extraction device 9, leaching box 10, thickener 11, one-way valve 12, leaching liquid 13, extraction pump 14, neutralization liquid washing liquid 15, exhaust screen head 16. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. Example 1

[0018] like Figure 1 to Figure 2 As shown, the prior art in this embodiment has the following problems: the inventors found that the existing iron removal methods can be summarized into two categories: one is the fire method represented by the conventional method to treat the leached slag, the disadvantage of this method is that the zinc leaching rate is low, the rotary kiln needs to be used to treat the leached slag to recover zinc oxide, the energy consumption is large, the tail gas needs to be treated, etc., resulting in waste of resources and high production costs; the other is the wet method represented by the high temperature and high acid method to treat the leached slag, the disadvantage of this method is that it needs special slag yards for storage, which is not conducive to environmental protection;

[0019] Therefore, the inventor provides an iron removal device in wet zinc smelting production, including a fluidized bed furnace 1, a tail gas treatment device, and a leaching device. The side of the fluidized bed furnace 1 is connected to the leaching device and the tail gas treatment balance device through a pipeline. The pipeline also includes an exhaust pipe 2 and a discharge pipe 3. The fluidized bed furnace 1 is provided with an air outlet 4 on the upper side and a discharge port 5 on the lower side. The tail gas treatment device also includes an exhaust pipe 2, a tail gas neutralization absorption box 6, a negative pressure pump 7, and a tail gas absorption tower. 8, the negative pressure pump 7 is respectively connected to the gas outlet 4, the tail gas neutralization absorption box 6, and the leaching box 10 of the boiling roasting furnace 1 through the exhaust pipe 2, and the tail gas absorption washing box is connected to the tail gas absorption tower 8 through the exhaust pipe 2; the leaching device also includes a discharge pipe 3, a pumping device 9, a leaching box 10, and a thickener 11. The pumping device 9 is respectively connected to the discharge port 5 and the leaching box 10 on the lower side of the boiling roasting furnace 1 through the discharge pipe 3, and the leaching box 10 is connected to the thickener 11 through the discharge pipe 3;

[0020] The effect and principle are as follows: the device has a simple structure and is easy to operate. It combines the pyrometallurgical and hydrometallurgical processes for treating leached slag, which not only ensures the zinc recovery rate and the iron leaching rate, but also treats the tail gas and avoids environmental pollution. When in use, the leached slag and the leachate 13 in the hydrometallurgical zinc smelting process can be put into a boiling furnace for roasting, and the tail gas generated by the roasting can be discharged into the tail gas treatment device through the exhaust pipe 2 for treatment, and the precious metals in the tail gas can be recovered; the slag after roasting is discharged into the leaching box 10 through the pumping device 9 for neutralization and reduction reaction, and finally the precipitate precipitated in the leaching box 10 is pumped into the thickener 11 for concentration and separation through the pumping pump 14, so as to obtain iron slag. Example 2

[0021] like Figure 1 to Figure 2 As shown, based on the above embodiment, a one-way valve 12 is installed on the exhaust pipe 2 provided in this embodiment. Example 3

[0022] like Figure 1 to Figure 2 As shown, according to the above embodiment, the leaching box 10 provided in this embodiment is provided with a leaching liquid 13;

[0023] The leaching solution 13 can be set to a strong acid solution or an electrolyte solution as required. Example 4

[0024] like Figure 1 to Figure 2 As shown, based on the above embodiment, a material pump 14 is installed on the discharge pipe 3 between the leaching box 10 and the thickener 11 provided in this embodiment;

[0025] The structure can pump the precipitate precipitated from the leaching box 10 to the thickener 11 for concentration and separation, thereby obtaining iron slag. Example 5

[0026] like Figure 1 to Figure 2 As shown, according to the above embodiment, the exhaust gas neutralization absorption box 6 provided in this embodiment is provided with a neutralizing liquid washing liquid 15, and the exhaust pipe 2 in the exhaust gas neutralization absorption box 6 is provided with an exhaust screen head 16 at the end thereof, and the exhaust screen head 16 is provided with a plurality of exhaust holes;

[0027] Among them, the exhaust screen head in this structure can facilitate the exhaust gas to fully react with the neutralizing washing liquid.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An iron removal device in wet zinc smelting production, comprising a fluidized bed furnace, an exhaust gas treatment device, and a leaching device. The side of the fluidized bed furnace is connected to the leaching device and the exhaust gas treatment balance device through a pipeline, and the pipeline also includes an exhaust pipe and a discharge pipe. Features: The fluidized bed furnace is provided with an air outlet on the upper side and a discharge port on the lower side. The exhaust gas treatment device also includes an exhaust pipe, an exhaust gas neutralization absorption box, a negative pressure pump, and an exhaust gas absorption tower. The negative pressure pump is respectively connected to the air outlet, the exhaust gas neutralization absorption box, and the leaching box of the fluidized bed furnace through the exhaust pipe, and the exhaust gas absorption and washing box is connected to the exhaust gas absorption tower through the exhaust pipe; the leaching device also includes a discharge pipe, a pumping device, a leaching box, and a thickener. The pumping device is respectively connected to the discharge port and the leaching box on the lower side of the fluidized bed furnace through the discharge pipe, and the leaching box is connected to the thickener through the discharge pipe.

2. The iron removal device in the hydrometallurgical zinc production according to claim 1, Features: A one-way valve is installed on the exhaust pipe.

3. The iron removal device in the hydrometallurgical zinc production according to claim 1, Features: The leaching box is provided with leaching liquid.

4. The iron removal device in the hydrometallurgical zinc production according to claim 1, Features: A material extraction pump is installed on the discharge pipe between the leaching box and the thickener.

5. The iron removal device in the hydrometallurgical zinc production according to claim 1, Features: The tail gas neutralization absorption box is provided with a neutralization liquid washing liquid, and the end of the exhaust pipe in the tail gas neutralization absorption box is provided with an exhaust screen head, and the exhaust screen head is provided with a plurality of exhaust holes.

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