CN-121714943-B - Integrated reaction device for chlorination iron extraction of steel tailings and tail gas purification

CN121714943BCN 121714943 BCN121714943 BCN 121714943BCN-121714943-B

Abstract

The invention discloses an integrated reaction device for chlorination iron extraction and tail gas purification of steel tailings, and relates to the technical field of steel tailings treatment. The device includes chlorination reaction mechanism and tail gas purification mechanism rather than the intercommunication, and tail gas purification mechanism is equipped with condensation subassembly, coalescence subassembly and entrapment subassembly in proper order. The aggregation assembly comprises a first baffling channel with adjustable channel size and a baffling component arranged in the first baffling channel, the baffling component comprises a first baffling plate and a second baffling plate, the surface of the second baffling plate is provided with a surface structure for enhancing the attachment and aggregation of aerosol, and the aggregation action intensity of the surface structure is changed along with the size change of the first baffling channel. According to the invention, through the synergistic effect of fractional condensation and a variable baffling coalescence structure, stable coalescence and trapping conditions of metal chloride aerosol can be obtained under different tail gas treatment capacity working conditions, and the integrated operation of the steel tailings chlorination iron extraction process and the tail gas purification process is realized.

Inventors

ZHANG HAIMING
ZHANG TINGAN
ZHANG AO
HUANG YILIN
LI YI
ZHAO XING

Assignees

鞍钢绿色资源科技有限公司
东北大学

Dates

Publication Date: 20260505
Application Date: 20260226

Claims (10)

1. The utility model provides a steel tailings chlorination draws iron and tail gas purification integrated reaction device, includes chlorination reaction mechanism (10) and with tail gas purification mechanism (11) of chlorination reaction mechanism (10) intercommunication, its characterized in that, tail gas purification mechanism (11) include: A condensation assembly for staged cooling of the tail gas from the chlorination reaction mechanism (10) to form a metal chloride aerosol at a predetermined location, the condensation assembly comprising a first condensation chamber (17) and a second condensation chamber (18); the condensing assembly is arranged at the downstream of the condensing assembly, and comprises a first baffling channel (60) and a baffling member arranged in the first baffling channel (60), wherein the channel size of the first baffling channel (60) is adjustable, the baffling member comprises a first baffling plate (30) and a second baffling plate (31), the surface of the second baffling plate (31) is provided with a surface structure for enhancing aerosol adhesion and coalescence, and the coalescence action strength of the surface structure is changed along with the change of the channel size of the first baffling channel (60); And the collecting assembly is arranged at the downstream of the gathering assembly and is used for collecting and recycling the gathered metal chloride.
2. The integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification as set forth in claim 1, wherein the surface structure of the second baffle plate (31) is a micro-bump structure, a corrugated structure or a concave-convex composite structure.
3. The integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification according to claim 1, wherein a plurality of grooves (32) are formed in the plate surface of the second baffle plate (31) at intervals along the extending direction of the second baffle plate, a top plate (33) is arranged in each groove (32) in a sliding mode, a V-shaped plate (34) is arranged at one end of the top plate (33), the other end of the top plate (33) is fixedly connected with the first baffle plate (30), and two ends of the V-shaped plate (34) are connected with two ends of the corresponding groove (32) through elastic pieces (35) respectively.
4. The integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification as set forth in claim 3, wherein the outer walls of the two ends of the V-shaped plate (34) and the elastic piece (35) are provided with a plurality of pairs of protruding blocks (36).
5. The integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification as set forth in claim 1, wherein the coalescence assembly further comprises a hydraulic telescopic rod (41) for adjusting the channel size of the first baffling channel (60), and the hydraulic telescopic rod (41) is used for driving the first movable frame (26) to move.
6. The integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification as set forth in claim 5, wherein the first movable frame (26) is connected with a sliding plate (28), and the sliding plate (28) drives the first baffle plate (30) and the second baffle plate (31) to relatively displace so as to change the aggregation strength of the surface structure of the second baffle plate (31) while changing the channel size of the first baffle channel (60).
7. The integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification as set forth in claim 1, wherein the trapping assembly comprises a cyclone separation structure, and the cyclone separation structure comprises a cyclone cylinder (45) and a driving motor (46) for driving the cyclone cylinder (45) to rotate.
8. The integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification as set forth in claim 7, wherein the trapping assembly further comprises a second baffling channel (61) arranged at the downstream of the cyclone separation structure, and a plurality of first mist trapping pieces (53) are arranged in the second baffling channel (61).
9. The integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification as set forth in claim 8, wherein a first spraying assembly (25) is arranged at the upper part of the coalescence assembly, the first spraying assembly (25) is used for flushing the surface of the second baffle plate (31), a second spraying assembly (50) is arranged at the upper part of the entrapment assembly, and the second spraying assembly (50) is used for flushing the surface of the first mist-catching piece (53).
10. The integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification as set forth in claim 1, wherein a first temperature sensor (63) and a second temperature sensor (64) are respectively disposed in the condensation assembly, and are used for monitoring temperatures of the first condensation cavity (17) and the second condensation cavity (18), a first heat exchanger (22) is installed in the first condensation cavity (17), and a second heat exchanger (23) is installed in the second condensation cavity (18).

Description

Integrated reaction device for chlorination iron extraction of steel tailings and tail gas purification Technical Field The invention belongs to the technical field related to steel tailings treatment, and particularly relates to an integrated reaction device for chlorination iron extraction and tail gas purification of steel tailings. Background The steel tailings are treated by adopting calcium chloride as a chlorinating agent, so that metals such as iron, copper and the like can be effectively separated. However, this process necessarily produces a highly corrosive, toxic off-gas containing chlorine, hydrogen chloride, and possibly entrained heavy metals. The traditional sectional mode of firstly extracting iron and then treating tail gas has the problems of long flow, high investment, leakage risk and the like. The following defects also exist in the prior art for steel tailings treatment: In the prior art, due to the lack of precise hierarchical control in the tail gas cooling process, metal chlorides tend to condense out of order in pipelines, heat exchangers or non-designed areas, resulting in uncontrollable white smoke generation positions. On one hand, white smoke has the particle size of submicron level, small particle size and weak inertia, is difficult to effectively intercept through a conventional spray, baffling or simple mist catching structure, has low catching efficiency, and on the other hand, disordered condensation is extremely easy to form crystallization and scaling on the inner wall of a pipeline or the heat exchange surface, so that the channel is blocked, the pressure drop is rapidly increased, and the continuous operation capability of the system is seriously influenced. In the prior art, most of tail gas trapping devices are designed by adopting fixed structural parameters, and the size of a baffling channel, the shape and the action strength of a mist trapping element are difficult to dynamically adjust after the design is completed. When the tail gas treatment capacity is relatively large, the flow channel is usually required to be reduced or the baffling stage number is increased to ensure the trapping efficiency, but the pressure drop of the system is greatly increased and scaling and blockage are accelerated, and when the tail gas treatment capacity is relatively small, the formed liquid film or liquid drops are easily disturbed severely due to the excessively strong baffling and trapping effects, so that the secondary entrainment is caused, and the trapping efficiency is reduced. Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide an integrated reaction device for chlorination and iron extraction of steel tailings and purification of tail gas, which is more practical and valuable. Disclosure of Invention The invention provides an integrated reaction device for chlorination and iron extraction of steel tailings and tail gas purification, which is used for overcoming the defects in the prior art. The invention discloses a steel tailing chlorination iron extraction and tail gas purification integrated reaction device, which is characterized by comprising the following specific technical means: The utility model provides a steel tailings chlorination draws iron and tail gas purification integrated reaction unit, includes chlorination reaction mechanism and with the tail gas purification mechanism of chlorination reaction mechanism intercommunication, tail gas purification mechanism includes: A condensation assembly for staged cooling of the tail gas from the chlorination reaction mechanism to form a metal chloride aerosol at a predetermined location, the condensation assembly comprising a first condensation chamber and a second condensation chamber; The condensing assembly is arranged at the downstream of the condensing assembly and comprises a first baffling channel and a baffling component arranged in the first baffling channel, and the channel size of the first baffling channel is adjustable; the baffle member comprises a first baffle plate and a second baffle plate, the surface of the second baffle plate is provided with a surface structure for enhancing the attachment and coalescence of aerosol, and the coalescence strength of the surface structure is changed along with the change of the size of the first baffle channel; And the collecting assembly is arranged at the downstream of the gathering assembly and is used for collecting and recycling the gathered metal chloride. In the scheme, through setting up the baffling coalescence subassembly of fractional condensation subassembly, variable passageway size and the baffling component surface structure of changing rather than cooperatingly, make metal chloride aerosol all can obtain stable inertia striking and surface attachment condition under different tail gas handling capacity operating modes, avoid rising, scale deposit jam and the liquid dr