CN111001444A

CN111001444A - Ion exchange resin tower

Info

Publication number: CN111001444A
Application number: CN201811166117.1A
Authority: CN
Inventors: 刘玉强; 沙滨; 杜昊; 王少华; 黄海丽; 贺来荣; 马永刚; 马海青; 陈小林; 魏建周; 王多江; 朱慧; 姚菲; 张飞; 杨松林; 唐金
Original assignee: Jinchuan Group Co Ltd
Current assignee: Jinchuan Group Co Ltd
Priority date: 2018-10-08
Filing date: 2018-10-08
Publication date: 2020-04-14
Anticipated expiration: 2038-10-08
Also published as: CN111001444B; WO2020073409A1

Abstract

An ion exchange resin column. Is suitable for recovering nickel and cobalt from low-grade laterite-nickel ore. The upper part and the lower part of the tower body of the ion exchange resin tower are provided with liquid inlet and outlet ports, the resin tower is of a multi-section layered structure, and each section of short joint is fixedly connected by a flange and a bolt; the middle part of each short joint is provided with a cavity structure for liquid drainage and liquid distribution, and the cavity consists of two porous plates and a hollow base plate; resin is filled in the short circuit, and is fixed by the perforated plate at the two ends of the short circuit, so that the movement and the loss of small-particle resin are avoided. The invention not only can effectively solve the problems of filling and liquid distribution of the resin with finer granularity, but also can greatly save the consumption of new water and reduce the discharge of acid wastewater, thus being an ideal device for treating low-grade laterite-nickel ore to recover nickel and cobalt.

Description

Ion exchange resin tower

Technical Field

The invention relates to the technical field of extracting nickel and cobalt by an ion exchange method in a hydrometallurgical process, in particular to a resin device used by the ion exchange method.

Background

At present, the domestic method for treating the low-grade laterite-nickel ore mainly adopts a sulfuric acid pressure acid leaching process (HPAL for short), the product is mainly nickel hydroxide, the product cost is high, and the added value is low.

Currently, ion exchange technology is relatively mature for the water treatment industry. Ion exchange technology was first used in peru in the 50 s for hydrometallurgical copper, and the metallurgists in the former soviet union made a lot of research in this regard. The continuous ion exchange technology developed in the united states in the 90 s is well established for use in industries such as amino acid extraction. The American RSA laboratory used Superlig resins to extract platinum metals at Impala Inc. In addition, the technology is widely applied to separating and purifying uranium. The extraction process in the foreign application of ion exchange technology to replace wet copper smelting has entered the industrialization stage. The domestic application of ion exchange technology is limited to power plant water treatment, sewage treatment and medicine industries.

The majority of ion exchange resins used in the world currently are organic ion exchange resins with styrene or acrylic acid polymers as frameworks, and the performance of the organic ion exchange resins has the defects that the performance is difficult to overcome: small exchange capacity, slow exchange speed, short cycle, high water content, high transformation expansion rate and the like, and particularly, the selectivity of the ion exchange is too poor to separate and enrich valuable metals in the multi-metal pickle liquor with very complex components. For inorganic ion exchange resin with higher efficiency and higher selectivity, the inorganic ion exchange resin cannot be applied to large-scale industrialization in the field of nonferrous metallurgy at present, and particularly can only be applied to a process for recovering nickel and cobalt from tail liquid in the process of extracting nickel and cobalt with higher economic values.

The ion exchange column is a column-shaped pressure vessel for carrying out ion exchange reaction, is an exchange device for ion exchange by a column method, generally adopts a cylindrical shape, and solution is introduced from one end of the column and fully contacts with a fixed ion exchange resin layer in a compact state or a flowing ion exchange resin bed in the column to carry out ion exchange. Because the granularity of the resin is smaller, the internal pressure of the solution flowing in the exchange column is higher, when the packing density of the resin has slight difference, the solution can easily flow in the exchange column in a dispersing way, the flow velocity of the area with higher density is slower, and the flow velocity of the area with lower density is faster, so that the solution can not uniformly move to the outlet of the exchange column, mixed flow is finally formed, the technical process of the ion exchange column can not be effectively realized, and particularly, the mixed flow phenomenon is more serious when the diameter of the exchange column is larger;

in order to ensure the running uniformity of the resin exchange column, the diameter of the existing exchange column must be controlled within 300mm, so the volume of the exchange column is limited and must be controlled to be about 150L, if a high production scale is to be achieved, the number of required resin towers is very large, the device cost is high, the control and maintenance problems in the industrial process are difficult to solve, and finally, the large-scale industrial production application cannot be realized.

The invention redesigns and optimizes the structure of the existing exchange column, effectively enlarges the diameter of the resin column on the premise of ensuring the uniformity of the axial flow of the solution to be unchanged, and increases the effective volume of the resin column to 10-20 times of the previous volume; in the same production scale, the number of the resin towers is greatly reduced, the scale of matched equipment is reduced, a control system is simplified, the energy consumption and material consumption in operation are reduced, and reliable equipment guarantee is provided for large-scale industrial application of the resin.

Disclosure of Invention

The invention aims to provide a resin tower structure form which is uniform in liquid distribution and easy to clean. The specific technical scheme is as follows: the utility model provides an ion exchange resin tower, the resin tower is formed by the combination of multistage resin column short circuit (3), connects with the flange between every section resin column short circuit (3), and the tip is provided with head (2) about the resin tower, and the head has mouth of pipe (1) that supplies business turn over liquid, place two perforated plates (4) and a backing plate (5) between resin column short circuit (3), constitute cylindrical cavity structure, backing plate (5) are hollow structure, the cavity diameter is unanimous with resin tower internal diameter.

Further, the volume of the cavity accounts for 1% -5% of the volume of the resin tower.

Furthermore, a liquid discharge port (6) for discharging liquid is arranged in the middle of the base plate (5), and the liquid discharge port (6) is connected with a liquid discharge valve (7).

Furthermore, all seal rings or sealing rings are used for sealing among the short joint (3), the porous plate (4) and the base plate (5), and the short joint, the porous plate and the base plate are fixed by bolts.

Furthermore, the porous plate (4) and the backing plate (5) are made of acid-resistant materials.

Furthermore, the porous plate (4) and the backing plate (5) are made of PTFE, PVC or PP materials.

Resin is filled in the short circuit, and is fixed by the perforated plate at the two ends of the short circuit, so that the movement and the loss of small-particle resin are avoided. When the solution enters the cavity structure in the base plate through the porous plate, the solution is mixed again, as the solution is in a flowing state and is influenced by Brownian motion of solution ions, the solution with different concentrations in each part of the cavity tends to be in a uniform state, the uniformly mixed solution flows into the next short circuit through the porous plate, and the ion exchange process with the resin is continued; the process is equivalent to the secondary distribution of the solution, and the uniformity and consistency of the axial flow of the solution in the resin tower are ensured.

On the premise of keeping the height of the resin tower unchanged, the diameter of the resin tower is increased to 3-4 times of the original diameter, the effective volume of the resin tower is greatly increased, and the effective volume is increased to 10-20 times of the original effective volume; in the industrial process, the number of the resin columns is greatly reduced, a solution distribution system and a control system can be greatly simplified, the system is convenient to operate and maintain, and feasibility is provided for large-scale industrial application; meanwhile, auxiliary matched equipment and instrument control of the resin tower are greatly reduced, the processing and manufacturing cost of the equipment is saved, the energy consumption and material consumption of system operation are reduced, and the economic benefit is remarkable.

The invention not only can effectively solve the problems of filling and liquid distribution of the resin with finer granularity, but also can greatly save the consumption of new water and reduce the discharge of acid wastewater, thus being an ideal device for treating low-grade laterite-nickel ore to recover nickel and cobalt.

Drawings

FIG. 1 is a front view of a resin tower.

FIG. 2 is a cross-sectional view of a resin tower.

FIG. 3 is a partial enlarged view of the resin tower

FIG. 4 is a perspective view of a resin tower.

Wherein, the device comprises 1-pipe orifice, 2-end enclosure, 3-short joint, 4-perforated plate, 5-backing plate, 6-liquid discharge port and 7-liquid discharge valve.

Detailed Description

The invention is realized in such a way that when resin is filled in the resin tower, the resin is filled in the cavity of the resin short joint in a sectional manner from bottom to top, the upper part and the lower part of the cavity are sealed by porous plates, and the cavity is in a compact state after being filled, thereby avoiding the resin loss in the operation process and not influencing the normal flow of liquid. A base plate is arranged between two adjacent porous plates of the resin short joint, and the interior of the base plate is of a hollow structure, so that liquid can be uniformly mixed and redistributed; the side wall of the base plate is provided with a liquid outlet which is used for discharging residual liquid or residual acid in the resin during washing or regeneration, so that the washing water consumption is reduced. The short joint, the perforated plate and the base plate of the resin tower are sealed by sealing rings or sealing rings and fixed by bolts.

When the resin tower runs, liquid flows axially from bottom to top, the uniformity of radial distribution is deviated due to the limitation of the granularity of the resin, the radial distribution of the liquid passing through the resin layer is inconsistent, bias flow is formed, if the deviation can not be corrected in time, the whole bias flow is finally caused, the running efficiency and the product quality of the resin tower are influenced, and the material consumption and the environmental protection burden are increased; through setting up the hollow backing plate structure of multilayer, liquid axial flow flows into the inside cavity of backing plate via the perforated plate after a period, and the solution that the concentration is uneven mixes again, reaches the effect of in time rectifying, and the even degree of liquid distribution obtains effective control in the final resin tower.

The resin tower is divided into four stages of adsorption, washing, regeneration and washing in the operation process, so that the adsorption of the resin tower is more uniform, the aggregation of a large amount of impurity ions is avoided, and the product quality is improved. After adsorption is finished, the residual stock solution in the resin tower needs to be washed, at the moment, a liquid outlet valve of the base plate is opened, most of the stock solution is discharged out of the resin tower, and then the residual stock solution is washed by water, so that the consumption of new water is greatly reduced, and the operation efficiency is optimized; after the resin is regenerated by high-concentration acid, the residual acid in the resin tower is preferentially discharged by the same method, so that the consumption of a large amount of new water and the generation of a large amount of dilute acid wastewater which is difficult to treat are avoided.

Claims

1. The utility model provides an ion exchange resin tower, its characterized in that, the resin tower is formed by the combination of multistage resin column short circuit (3), connects with the flange between every section resin column short circuit (3), and the tip is provided with head (2) about the resin tower, and the head has mouth of pipe (1) that supplies business turn over liquid, place two perforated plates (4) and a backing plate (5) between resin column short circuit (3), constitute cylindrical cavity structure, backing plate (5) are hollow structure, the cavity diameter is unanimous with resin tower internal diameter.

2. An ion exchange resin column according to claim 1, wherein the volume of said cavity is 1% to 5% of the volume of the resin column.

3. An ion exchange resin column according to claim 1 or 2, wherein the middle part of the base plate (5) is provided with a liquid outlet (6) for discharging liquid, and the liquid outlet (6) is connected with a liquid outlet valve (7).

4. The ion exchange resin tower according to claim 3, wherein the short joint (3), the porous plate (4) and the backing plate (5) are sealed by a sealing ring or a sealing ring and fixed by bolts.

5. The column according to claim 4, wherein the perforated plate (4) and the backing plate (5) are made of acid-resistant material.

6. An ion exchange resin column according to claim 5, wherein the perforated plate (4) and the backing plate (5) are made of PTFE, PVC or PP.