CN218951163U

CN218951163U - Recovery plant for multi-channel high-purity iodine extraction in iodine-containing wastewater

Info

Publication number: CN218951163U
Application number: CN202122514241.6U
Authority: CN
Inventors: 钱栋; 蔡荣贤; 陈彦鸣
Original assignee: Changzhou Ruidian Material Technology Co ltd
Current assignee: Changzhou Ruidian Material Technology Co ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2023-05-02
Anticipated expiration: 2031-10-19

Abstract

The utility model provides a recycling device for extracting iodine in multichannel high purity in iodine-containing wastewater, which comprises an iodine-containing wastewater storage tank, a mixing adjustment tank, a reaction precipitation tank, a centrifugal dehydrator, a steam stripping iodine tank and an iodine gas absorption tower; the outlet end of the iodine-containing wastewater storage tank is communicated with the mixing adjustment tank, and the inlet end of the iodine-containing wastewater storage tank is used for conveying iodine-containing wastewater to be extracted; the outlet end of the mixing adjusting tank is communicated with the reaction precipitation tank; one end of the reaction precipitation tank is communicated with the mixing adjustment tank, and the other end of the reaction precipitation tank discharges the precipitation mixture after reaction to the centrifugal dehydrator; the outlet end of the centrifugal dehydrator is communicated with the steam iodine extraction tank; the steam stripping iodine tank is used for extracting iodine for the second time from the wastewater separated by the centrifugal dehydrator; the iodine gas absorption tower is used for absorbing iodine gas generated in the process of each device, and is circularly communicated to the reaction precipitation tank after recovery and absorption. The recovery equipment not only can obtain high recovery rate, but also can remove iodine from the tail water, and can realize that the tail water can directly enter a wastewater factory for treatment.

Description

Recovery plant for multi-channel high-purity iodine extraction in iodine-containing wastewater

Technical Field

The utility model belongs to the technical field of iodine recovery and preparation equipment, and particularly relates to multi-channel high-purity iodine recovery equipment for iodine-containing wastewater.

Background

Iodine is required in many places in industrial production and living and is extremely important for life of animals and plants, but as a scarce resource, the production of iodine has been difficult to meet market demands, so that the technology of recovering and extracting iodine from iodine-containing wastewater has important significance for social development.

The current iodine production methods mainly comprise an air blowing method, an extraction method and the like. The technological process of preparing iodine is that iodine-containing material is first extracted through acidification and oxidation, then reduced and enriched, finally oxidized into iodine simple substance, and centrifugally to eliminate water and soluble impurity to obtain the product. In general factories, the centrifugal separation is carried out by adopting an upper discharging type manual three-leg or hanging belt, and the elemental iodine with water removed is directly taken out of the upper part of the centrifugal machine together with filter cloth by manpower. The simple substance iodine has strong corrosiveness and irritation, and the long-term iodine contact can cause great harm to the skin, respiratory system and vision of people. In addition, the rough open type manual operation mode also increases the process loss of the product, and the quality of the product is difficult to completely guarantee; at the same time, a great deal of sublimated iodine gas has great influence on the surrounding environment, and how to select a set of proper iodine production or recovery equipment to achieve high iodine return rate is very important.

Disclosure of Invention

The technical scheme is as follows: in order to solve the technical problems, the utility model provides a recycling device for extracting iodine in multichannel high purity in iodine-containing wastewater, which comprises the following steps:

comprises an iodine-containing wastewater storage tank, a mixing adjustment tank, a reaction precipitation tank, a centrifugal dehydrator, a steam stripping iodine tank and an iodine gas absorption tower; the outlet end of the iodine-containing wastewater storage tank is communicated with the mixing adjustment tank, and the inlet end of the iodine-containing wastewater storage tank is used for conveying iodine-containing wastewater to be extracted; the outlet end of the mixing adjusting tank is communicated with the reaction precipitation tank; one end of the reaction precipitation tank is communicated with the iodine-containing wastewater storage tank, and the other end of the reaction precipitation tank discharges the reacted precipitation mixture to a centrifugal dehydrator; the centrifugal dehydrator is used for filtering and classifying solid iodine, and filtrate is communicated to the steam iodine extraction tank through the outlet end of the centrifugal dehydrator; the steam iodine extraction tank is used for extracting iodine for the second time from the wastewater separated by the centrifugal dehydrator; the iodine gas absorption tower is used for absorbing iodine gas generated in the process of each device, and is circularly communicated to the reaction precipitation tank after recovery and absorption.

As an improvement, the bottom of the reaction precipitation tank is provided with a plurality of ports, the ports comprise a first port which is an aeration pipe, and iodine precipitation is conveyed out from a second port through air introduced through the aeration pipe, so that blockage is avoided; the third port is arranged on the side wall of the bottom, and is convenient to discharge through the side wall.

As an improvement, the iodine-containing wastewater storage tank is used for storing iodine-containing wastewater and carrying out feeding inspection on iodine concentration and pH value treatment.

As an improvement, the mixing adjustment tank is used for mixing and sampling detection treatment of the wastewater containing iodine.

As an improvement, the reaction precipitation tank is of an anti-corrosion tank structure, and a lining PE structure is arranged on the outer side wall of the inner cavity.

As an improvement, the steam iodine extraction tank is of an FRP material structure, and the inside of the steam iodine extraction tank comprises a plurality of groups of ventilation pipelines and is used for secondarily extracting iodine in filtrate through a heat exchange structure to obtain iodine steam.

As an improvement, one end of the air duct is an air inlet, the other end of the air duct is an exhaust outlet, the air inlet is used for introducing a gaseous medium with a certain temperature, the exhaust outlet is a condensed gaseous medium, and a circulating steam drum structure is connected between the air inlet and the exhaust outlet.

The beneficial effects are that: compared with the prior art, the recovery device provided by the utility model adopts a steam iodine extraction tank, and particularly adopts an FRP material, namely a fiber reinforced composite material structure, so that the service life is longer, the safety coefficient is high.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic structural view of the device of the present utility model.

In the figure: the device comprises an iodine-containing wastewater storage tank 1, a mixing adjustment tank 2, a reaction precipitation tank 3, a centrifugal dehydrator 4, a steam iodine extraction tank 5, an iodine gas absorption tower 6, a first port 7, a third port 8 and a second port 9.

Detailed Description

The following describes the embodiments of the present utility model in further detail with reference to examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

The recovery equipment adopted in the utility model comprises an iodine-containing wastewater storage tank 1, a mixing adjustment tank 2, a reaction precipitation tank 3, a centrifugal dehydrator 4, a steam stripping iodine tank 5 and an iodine gas absorption tower 6; the outlet end of the iodine-containing wastewater storage tank 1 is communicated with the mixing adjustment tank 2, and the inlet end is used for conveying iodine-containing wastewater to be extracted; the outlet end of the mixing adjustment tank 2 is communicated with the reaction precipitation tank 3; one end of the reaction precipitation tank 3 is communicated with the mixing adjustment tank, and the other end of the reaction precipitation tank discharges the reacted precipitation mixture to the centrifugal dehydrator 4; the centrifugal dehydrator 4 is used for filtering and classifying solid iodine, and filtrate is communicated with the steam iodine extraction tank 5 through the outlet end of the centrifugal dehydrator 4; the steam iodine extraction tank 5 is used for extracting iodine for the second time from the wastewater separated by the centrifugal dehydrator; the iodine gas absorption tower 6 is used for absorbing iodine gas generated in the process of each device, and is circularly communicated to the reaction precipitation tank 3 after recovery and absorption.

Compared with the conventional technology, the utility model improves that the fixed iodine after reaction can be smoothly discharged out of the bottom of the reaction precipitation tank, and specifically comprises the following steps: the bottom of the reaction precipitation tank is provided with a plurality of ports, including a first port 7 which is set as an aeration pipe, and iodine precipitation is conveyed out from a second port 9 by introducing air through the aeration pipe, so that blockage is avoided; the third port 8 is provided in the bottom side wall, through which the discharge is facilitated.

In addition, the reaction precipitation tank 3 is of an anti-corrosion structure, the whole reaction precipitation tank can be made of PE material or metal material, and when the reaction precipitation tank is made of metal material, a PE glue structure with proper thickness is arranged inside the reaction precipitation tank to prevent chemical corrosion.

As a specific implementation mode of the utility model, the steam stripping iodine tank is made of FRP material, namely a fiber reinforced composite material structure, has longer service life and high safety coefficient, and the steam stripping iodine method is used for extracting residual liquid iodine and absorbing and recycling gaseous iodine at the stripping tail end by using an iodine absorbing agent, or directly recycling the extracted gaseous iodine into a reaction precipitation tank, so that the tail water can be further removed from iodine besides the high recovery rate, and the tail water can be directly treated in a wastewater factory.

Optionally, the device also comprises laboratory detection equipment for sampling detection, including mainly measuring the pH value, conductivity, substance concentration and the like of the solution, and is used for carrying out qualitative and quantitative analysis on the whole reaction process, thereby improving the accuracy of the production process and the industrial automatic production level.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. A recycling device for extracting iodine from iodine-containing wastewater in a multi-channel high-purity manner is characterized in that: comprises an iodine-containing wastewater storage tank (1), a mixing adjusting tank (2), a reaction precipitation tank (3), a centrifugal dehydrator (4), a steam stripping iodine tank (5) and an iodine gas absorption tower (6); the outlet end of the iodine-containing wastewater storage tank (1) is communicated with the mixing adjustment tank (2), and the inlet end is used for conveying iodine-containing wastewater to be extracted; the outlet end of the mixing adjusting tank (2) is communicated with the reaction precipitation tank (3); one end of the reaction precipitation tank (3) is communicated with the mixing adjustment tank (2), and the other end of the reaction precipitation tank discharges the precipitation mixture after reaction to the centrifugal dehydrator (4); the centrifugal dehydrator (4) is used for filtering and classifying solid iodine, and filtrate is communicated with the iodine steaming and stripping tank (5) through the outlet end of the centrifugal dehydrator (4); the steam stripping iodine tank (5) is used for extracting iodine for the second time from the wastewater separated by the centrifugal dehydrator; the iodine gas absorption tower (6) is used for absorbing iodine gas generated in the process of each device, and is circularly communicated to the reaction precipitation tank (3) after recovery and absorption.

2. The recycling apparatus for multi-path high-purity iodine extraction in iodine-containing wastewater according to claim 1, characterized in that: the bottom of the reaction precipitation tank (3) is provided with a plurality of ports, the ports comprise a first port (7) which is arranged as an aeration pipe, and iodine precipitation is conveyed out from a second port (9) through air inlet of the aeration pipe, so that blockage is avoided; the third port (8) is arranged on the side wall of the bottom and is convenient to discharge through the side wall.

3. The recycling apparatus for multi-path high-purity iodine extraction in iodine-containing wastewater according to claim 1, characterized in that: the reaction precipitation tank (3) is of an anti-corrosion tank structure, and a lining PE structure is arranged on the outer side wall of the inner cavity.

4. The recycling apparatus for multi-path high-purity iodine extraction in iodine-containing wastewater according to claim 1, characterized in that: the steam stripping iodine tank (5) is of an FRP material structure, and comprises a plurality of groups of ventilation pipelines inside, and is used for extracting iodine in filtrate for the second time through a heat exchange structure to obtain iodine steam.

5. The recycling apparatus for multi-path high-purity iodine extraction in iodine-containing wastewater according to claim 4, wherein: one end of the air duct is an air inlet, the other end of the air duct is an exhaust outlet, the air inlet is used for introducing a gaseous medium with a certain temperature, the exhaust outlet is a condensed gaseous medium, and a circulating steam drum structure is connected between the air inlet and the exhaust outlet.