Continuous production device for polyferric chloride and method thereof

Patent metadata

Field	Value
Publication number	US-2021292184-A1
Application number	US-202117202361-A
Country	US
Kind code	A1
Filing date	Mar 16, 2021
Priority date	Mar 20, 2020
Publication date	Sep 23, 2021
Grant date	—

Abstract

A device for continuous production of polyferric chloride and a method are disclosed. The device includes a first mixing pipeline, a second reaction pipeline, a third reaction pipeline, and a concentration device sequentially connected. The first mixing pipeline, the second reaction pipeline and the third reaction pipeline are each provided with a circulating spray device, and the circulating spray device includes a reflux pump, a reflux pipeline and an atomizer. The atomizer includes an atomizing pipe, and a chemical filler plate for promoting gas-liquid contact is arranged below the atomizing pipe. The reflux pump is used to extract liquid from each reaction tank, and then transport the liquid to the atomizer on the top of the reaction tank. The atomizer is driven by the pressure of the reflux pump or the motor to atomize the liquid.

First claim

What is claimed is:

1 . A continuous production device for polyferric chloride, comprising: a first mixing pipeline, a second reaction pipeline, a third reaction pipeline, a concentration device and a drying device; wherein the first mixing pipeline is provided with a first sodium nitrite feed inlet, a ferrous chloride feed inlet, a waste hydrochloric acid mixed liquid inlet, and a first oxygen inlet; a liquid outlet end of the first mixing pipeline is connected to the second reaction pipeline, and the second reaction pipeline is provided with a second sodium nitrite feed inlet and a second oxygen inlet; a liquid outlet end of the second reaction pipeline is connected to the third reaction pipeline, and a top of the third reaction pipeline is provided with a third oxygen inlet and a polymerizing agent feed inlet; the first mixing pipeline, the second reaction pipeline and the third reaction pipeline are each provided with a circulating spray device, and the circulating spray device comprises a reflux pump, a reflux pipeline and an atomizer, the atomizer comprises an atomizing pipe, the atomizing pipe is arranged horizontally and the atomizing pipe has an atomizing nozzle arranged upwardly; a horizontally arranged chemical filler plate for promoting gas-liquid contact is arranged below the atomizing pipe; the third reaction pipeline is further connected to the concentration device, and the concentration device is provided for an evaporation and a concentration of a polyferric chloride liquid; the concentration device comprises a steam chamber and a plurality of screw conveyors; cylinders of the plurality of screw conveyors are located inside the steam chamber, and a motor of each screw conveyor of the plurality of screw conveyors is located outside the steam chamber; the plurality of screw conveyors are arranged horizontally and at a same height, a liquid inlet and a liquid outlet of each two adjacent screw conveyors of the plurality of screw conveyors are connected head-to-tail, each cylinder of the each screw conveyor is provided with an interlayer, the interlayer is provided with a thermal conductive oil pipeline, and the each cylinder is further provided with a steam release port; and the concentration device is further connected to the drying device, and the drying device is provided for drying a concentrated solution.

2 . The continuous production device according to claim 1 , wherein walls of the steam chamber are made of a heat-insulating material.

3 . The continuous production device according to claim 1 , wherein a sampling pipeline is further provided on a pipeline between the concentration device and the third reaction pipeline, a liquid outlet of the third reaction pipeline is further provided with a reflux pipe, and the reflux pipe is connected to a liquid inlet of the atomizer of the second reaction pipeline.

4 . The continuous production device according to claim 1 , wherein each of the first mixing pipeline, the second reaction pipeline, and the third reaction pipeline comprises a pipeline body, a stirring shaft is horizontally arranged inside the pipeline body, and spiral blades are provided on the stirring shaft; a first bevel gear is provided at an end of the stirring shaft, a drive motor is provided on a top of the pipeline body, the drive motor is connected to a vertical rotating shaft, and an end of the vertical rotating shaft is provided with a second bevel gear, and the second bevel gear meshes with the first bevel gear, the vertical rotating shaft drives the stirring shaft to rotate through the first bevel gear and the second bevel gear; and a mechanical seal structure is provided at a connection joint between the vertical rotating shaft and the pipeline body.

5 . The continuous production device according to claim 1 , wherein a left side and a right side of the drying device are respectively symmetrically provided with a fixing seat connection joint; a first feed inlet is provided on a first side of the fixing seat connection joint, and a first outlet is provided on a second side of the fixing seat connection joint and the first outlet is arranged at a position 90 degrees from the first feed inlet; and a double helix agitator is provided in a middle position inside the drying device.

6 . A continuous production method of the polyferric chloride, using the continuous production device according to claim 1 , wherein the continuous production method comprises the following steps:
(1) adding waste hydrochloric acid, ferric chloride and sodium nitrite into the first mixing pipeline, stirring and mixing to obtain a mixed liquid; using the reflux pump to extract a first partial liquid of the mixed liquid from the first mixing pipeline and then transport the first partial liquid to the atomizer on a top of the first mixing pipeline, driving the atomizer by a pressure of the reflux pump or a drive motor to atomize the first partial liquid; during a first atomization process, continuously supplying oxygen for performing a preliminary reaction on the first partial liquid to obtain a preliminary reacted liquid; at the same time of the first atomization process and the preliminary reaction of the first partial liquid, passing the preliminary reacted liquid into the second reaction pipeline; (2) after the preliminary reacted liquid flows into the second reaction pipeline, using the reflux pump to extract a second partial liquid of the preliminary reacted liquid from the second reaction pipeline and then transport the second partial liquid to the atomizer on a top of the second reaction pipeline, driving the atomizer by the pressure of the reflux pump or the drive motor to atomize the second partial liquid; during a second atomization process, continuously supplying the oxygen and adding the sodium nitrite for performing a first catalytic oxidation reaction on the second partial liquid to obtain an oxidized mixed liquid; at the same time of the second atomization process and the first catalytic oxidation reaction of the second partial liquid, passing the oxidized mixed liquid into the third reaction pipeline; (3) after the oxidized mixed liquid flows into the third reaction pipeline, using the reflux pump to extract a third partial liquid of the oxidized mixed liquid from the third reaction pipeline and then transport the third partial liquid to the atomizer on the top of the third reaction pipeline, driving the atomizer by the pressure of the reflux pump or the drive motor to atomize the third partial liquid; during a third atomization process, continuously supplying the oxygen and adding the polymerizing agent for performing a second catalytic oxidation reaction and a polymerization reaction on the third partial liquid to obtain a polymerized mixed liquid; at the same time of the third atomization process, passing the polymerized mixed liquid into the concentration device for a concentration of the polymerized mixed liquid; and (4) passing the polymerized mixed liquid into the concentration device for the concentration of the polymerized mixed liquid to obtain the polyferric chloride liquid; collecting steam generated during the concentration of the polymerized mixed liquid, and pre-heating the first mixing pipeline; after the concentration of the polymerized mixed liquid, the polyferric chloride liquid is obtained; when a solid polyferric chloride is needed, concentrating the polyferric chloride liquid to a predetermined concentration to obtain a concentrated polyferric chloride liquid, and then natural cooling the concentrated polyferric chloride liquid under a sealed condition and room temperature to obtain the solid polyferric chloride with a block shape.

Assignees

• Univ Tongji

Inventors

• Li Fengting

Classifications

• C01G49/10 Primary

  Halides {(C01G49/0018 takes precedence)} · CPC title

• B01J2219/00155

  using insulating materials or refractories · CPC title

• B01J19/1862

  placed in series · CPC title

• B01J10/002

  carried out in foam, aerosol or bubbles · CPC title

• B01J2219/00094

  Jackets · CPC title