Preparation method of stable, safe and reliable iron chloride product

Abstract

The invention discloses a preparation method of a stable, safe and reliable iron chloride product, and relates to the technical field of inorganic compounds ferric chloride and ferrous chloride. The preparation method provided by the invention comprises the following steps: applying an electric field to iron and hydrochloric acid in a device to change an electrochemical potential, so that the iron is subjected to chemical replacement and electrochemical reaction, and the iron is directly dissolved in the acid to form ferrous chloride or ferric chloride. By controlling the reaction conditions, flammable and explosive hydrogen generated in the general replacement reaction is avoided, the safety of the chemical process is greatly improved, and the requirements on the production conditions are reduced. Meanwhile, the reaction speed can be increased, the reaction is thorough, and the reaction efficiency and the utilization rate of raw materials and equipment are improved. The obtained solution can be concentrated, crystallized and the like to obtain a solid product.

Description

Technical Field

[0001] The invention relates to the technical field of ferric chloride and ferrous chloride, and in particular to a stable, safe and reliable preparation method of ferrous chloride and ferric chloride. Background Art

[0002] In the traditional production method, ferrous chloride is obtained by substitution reaction between iron and hydrochloric acid or by oxidation-reduction reaction between iron and ferric chloride solution. Ferric chloride is generally obtained by directly obtaining a solid product by high-temperature reaction between iron and chlorine gas or by oxidation reaction between ferrous chloride and an oxidant (such as chlorine, oxygen, peroxide, etc.) to obtain a liquid product.

[0003] In the traditional production process of ferric chloride and ferrous chloride, iron reacts with chlorine to produce ferric chloride to obtain a solid product with high purity and convenient transportation. However, the production is limited because the combustion furnace needs to run continuously and highly toxic chlorine is used. The preparation of ferrous chloride or ferric chloride through displacement and oxidation reactions requires high equipment requirements, many reaction steps, low equipment efficiency, and a large amount of hydrogen is produced in the displacement reaction. Hydrogen is flammable and explosive, and is colorless and odorless, so strict fire and explosion prevention is required for production equipment and sites, which poses great safety hazards.

[0004] In view of this, the present invention provides a stable, safe and reliable method for preparing ferrous chloride and ferric chloride to achieve the intrinsic safety goal of safe production. Summary of the invention

[0005] The purpose of the present invention is to provide a stable, safe and reliable method for preparing ferrous chloride and ferric chloride, which can fundamentally solve the problem of safe production. In the iron and hydrochloric acid system, different products can be obtained by changing the electrochemical potential and the amount of oxygen, and the corresponding liquid target product can be obtained safely and reliably by controlling the potential, working current and the ratio of oxygen addition. The liquid product can be obtained as a solid product by concentration, crystallization and other methods.

[0006] To achieve the above-mentioned purpose of the invention, the technical solution of the present invention is as follows:

[0007] The present invention provides a stable, safe and reliable method for preparing ferrous chloride and ferric chloride solutions, comprising the following steps:

[0008] In the device, materials are added and appropriate current is maintained for reaction.

[0009] Add metal iron and connect it to the positive pole of the power supply.

[0010] Add oxygen.

[0011] Turn on ventilation.

[0012] Turn on the rectifier power supply and adjust the voltage to the set value.

[0013] Hydrochloric acid was added.

[0014] Adjust voltage, current and oxygen flow.

[0015] In order to facilitate the continuous reaction, the metal iron can be pre-made into a certain shape to ensure effective connection with the positive pole of the power supply in the device and sufficient reaction surface area.

[0016] The beneficial effects of the present invention are:

[0017] (1) The preparation method of the present invention avoids the explosion hazard caused by the production of a large amount of hydrogen in the traditional substitution reaction.

[0018] (2) The present invention can obtain different products by controlling the current / oxygen flow ratio.

[0019] (3) The present invention can adjust the production intensity by adjusting the working current, has great production flexibility, and can respond quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a process flow chart of the preparation method of the stable, safe and reliable ferrous chloride and ferric chloride solutions. DETAILED DESCRIPTION

[0021] The following non-limiting examples can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. The following content is merely an exemplary description of the scope of protection claimed in this application, and those skilled in the art can make various changes and modifications to the invention of this application based on the disclosed content, and they should also fall within the scope of protection claimed in this application.

[0022] The present invention is further described below by way of specific examples. The various chemical reagents used in the examples of the present invention are obtained through conventional commercial channels unless otherwise specified. Unless otherwise specified, the contents described below are all weight contents. Unless otherwise specified, it is understood that the process is carried out at room temperature.

[0023] In the following examples, the sources of raw materials are as follows:

[0024]

[0025] Example 1

[0026] Reaction cell anode 7.5mm 2 , current density 400A / mm 2 , current 3000A, voltage 3.52V, working time 4hr. Consumption of iron 12.2kg, oxygen 2.4m3, 31% HCL 50kg. FeCl2 output 27.0kg (pure).

[0027] Example 2

[0028] Reaction cell anode 7.5mm 2 , current density 500A / mm 2 , current 3750A, voltage 3.53V, working time 4hr. Consumption of iron 15.21kg, oxygen 2.99m3, 31% HCL 62.66kg. FeCl2 output 33.80kg (pure).

[0029] Example 3

[0030] Reaction cell anode 7.5mm 2 , current density 600A / mm 2 , current 4500A, voltage 3.53V, working time 4hr. Consumption of iron 18.27kg, oxygen 3.58m3, 31% HCL 75.28kg. FeCl2 output 40.60kg (pure).

[0031] Example 4

[0032] Reaction cell anode 7.5mm 2 , current density 800A / mm 2 , current 6000A, voltage 3.54V, working time 4hr. Consumption of iron 24.34kg, oxygen 4.82m 3 , 31% HCL 100.55kg. FeCl2 output 54.07kg (pure).

[0033] Comparative Example 1

[0034] A reactor was used as the reaction equipment. 200 kg of 31% hydrochloric acid was added into the reactor, and 12.2 kg of iron was added to carry out a replacement reaction and collect the gas. 50.5 kg of 31% HCL was actually consumed, 27.11 kg of pure FeCl2 was obtained, and 4.78 m of pure hydrogen was collected. 3 .

[0035] Comparative Example 2

[0036] A reactor was used as the reaction equipment. 200 kg of 31% hydrochloric acid was added into the reactor, and 15.0 kg of iron was added to carry out a replacement reaction and collect the gas. 62.1 kg of 31% HCL was actually consumed, 33.34 kg of pure FeCl2 was obtained, and 5.88 m of pure hydrogen was collected. 3 .

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. By changing the relevant parameters, FeCl2, FeCl3 and products with different proportions and production scales can be obtained. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. A method for preparing a stable, safe and reliable iron chloride product, characterized in that: The following steps are involved: (1) Ferrous chloride or ferric chloride can be directly obtained by reacting iron, oxygen and hydrochloric acid in the device; (2) The reaction process is carried out in the device under the electric field applied by electrodes, and no hydrogen is generated or escaped during the reaction process, and the reaction process is safe and controllable; (3) The solution obtained in the device can be concentrated, crystallized, and other methods to obtain a solid product.

2. A method for preparing a stable, safe and reliable iron chloride product according to claim 1, characterized in that: Under the action of the electric field of the device, iron and hydrochloric acid undergo an oxidation-reduction reaction in the presence of oxygen to generate ferrous chloride or ferric chloride.

3. A method for preparing a stable, safe and reliable iron chloride product according to claim 2, characterized in that: The device uses metal iron as an anode, or uses other conductors as anodes to perform transition, and uses metal iron as an actual anode to participate in the reaction.

4. A method for preparing a stable, safe and reliable iron chloride product according to claim 2, characterized in that: The device uses a porous conductive material as a cathode.

5. A method for preparing a stable, safe and reliable iron chloride product according to any one of claims 1 to 4, characterized in that: Oxygen is introduced at or near the cathode.

6. A method for preparing a stable, safe and reliable iron chloride product according to claim 5, characterized in that: The formed device can adjust the working current by adjusting the voltage to maintain the expected working state.

7. A method for preparing a stable, safe and reliable iron chloride product according to claim 6, characterized in that: The target product can be obtained by adjusting the ratio of current to oxygen.

8. A method for preparing a stable, safe and reliable iron chloride product according to claim 6 or 7, characterized in that: The device can be designed to have different specifications according to different needs, with different volumes, production capacities, working voltages and working current ranges.

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