Calcium sulfide preparation device based on sulfur vapor reductive decomposition of phosphogypsum

Abstract

The calcium sulfide preparation device comprises a tubular furnace and an activated carbon tester, a first air inlet is formed in the bottom end of the tubular furnace, the activated carbon tester is communicated with the position, close to the first air inlet, of the bottom end of the tubular furnace, an alundum tube is arranged in the activated carbon tester, and the alundum tube is communicated with the first air inlet. A first thermocouple is arranged on the inner side of the alundum tube, a second air inlet is formed in the outer side end of the alundum tube, the other end of the alundum tube is communicated with the tubular furnace, and a second thermocouple is arranged in the tubular furnace. The tubular furnace and the activated carbon tester are matched for use, the whole reaction system is controlled through gas flow, gas-solid reaction is performed, the reaction contact area is large, calcium sulfide is prepared by reacting sulfur steam with phosphogypsum, generated CaS and CaSO4 can be continuously subjected to subsequent second-step reaction to generate CaO and SO2, and the CaO is finally calcined to form qualified cement clinker, so that the production efficiency is improved, and the production cost is reduced. SO2 obtained by the reaction can be used for sulfuric acid production, is efficient and simple, and is convenient to popularize and implement.

Description

Technical Field

[0001] This utility model belongs to the technical field of calcium sulfide preparation device, specifically relating to a calcium sulfide preparation device based on the reduction and decomposition of phosphogypsum by sulfur vapor. Background Technology

[0002] Phosphogypsum contains a wide variety of impurities, and its storage not only occupies a large amount of land resources, but the impurities and heavy metals within it can also harm the environment and human health. Excessive phosphorus entering rivers can cause eutrophication, polluting water bodies, lakes, rivers, and groundwater near the storage site and damaging biodiversity. These pollutants can also enter the entire ecological cycle with rainfall, endangering human and biological health. Heavy metals in phosphogypsum can migrate into groundwater and directly or indirectly harm human health through the food chain.

[0003] Currently, there is a lack of comprehensive utilization of phosphorus chemical solid wastes such as phosphogypsum, and the co-processing and comprehensive utilization of phosphogypsum is urgently needed.

[0004] Based on this, a calcium sulfide preparation device based on the reduction decomposition of phosphogypsum by sulfur vapor is proposed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a calcium sulfide preparation device based on the reduction and decomposition of phosphogypsum by sulfur vapor, in order to address the shortcomings of the prior art mentioned above.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a calcium sulfide preparation device based on the reduction and decomposition of phosphogypsum by sulfur vapor, including a tube furnace and an activated carbon analyzer;

[0007] The tubular furnace is provided with a first air inlet at the bottom end. An activated carbon analyzer is connected to the bottom end of the tubular furnace near the first air inlet. An alumina tube is provided inside the activated carbon analyzer. A first thermocouple is provided on the inner side of the alumina tube. A second air inlet is provided on the outer end of the alumina tube.

[0008] The other end of the corundum tube is connected to a tubular furnace, and a second thermocouple is installed inside the tubular furnace.

[0009] The first thermocouple signal is connected to a first temperature controller, and the second thermocouple signal is connected to a second temperature controller. The first and second temperature controllers are powered by a power source.

[0010] As a further explanation of this utility model, the second air inlet is connected to the corundum tube by a rubber plug.

[0011] As a further explanation of this utility model, the tubular furnace is provided with a feed inlet near the bottom end and a tail gas outlet at the top end.

[0012] As a further explanation of this utility model, phosphogypsum is placed in the material support plate inside the tubular furnace, and sulfur is placed in the corundum tube inside the activated carbon analyzer.

[0013] This utility model has the following advantages compared with the prior art:

[0014] This invention utilizes a tubular furnace and an activated carbon analyzer. The entire reaction system is controlled by gas flow rate, resulting in a gas-solid reaction with a large reaction contact area. Calcium sulfide is produced by reacting sulfur vapor with phosphogypsum. The generated CaS and CaSO4 can then undergo a second reaction to produce CaO and SO2. The CaO is ultimately calcined to form qualified cement clinker, while the SO2 obtained from the reaction can be used for sulfuric acid production. This method is highly efficient, simple, and easy to promote and implement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1-Tube furnace; 11-First air inlet; 12-Feed inlet; 13-Tail gas outlet; 14-Second thermocouple; 2-Activated carbon analyzer; 21-Corundum tube; 22-First thermocouple; 23-Rubber stopper; 24-Second air inlet; 3-Second temperature controller; 4-First temperature controller; 5-Power supply. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figure 1 As shown, this utility model provides a technical solution: a calcium sulfide preparation device based on the reduction and decomposition of phosphogypsum by sulfur vapor, including a tube furnace 1 and an activated carbon analyzer 2;

[0020] The tubular furnace 1 is provided with a first air inlet 11 at the bottom end, and a feed inlet 12 is provided near the bottom end of the tubular furnace 1. Phosphogypsum is placed in the material support plate inside the tubular furnace 1.

[0021] An activated carbon analyzer 2 is connected to the bottom of the tubular furnace 1 near the first air inlet 11. An alumina tube 21 is installed inside the activated carbon analyzer 2. A first thermocouple 22 is installed inside the alumina tube 21. A second thermocouple 14 is installed inside the tubular furnace 1. The first thermocouple 22 is connected to a first temperature controller 4. The second thermocouple 14 is connected to a second temperature controller 3. The first temperature controller 4 and the second temperature controller 3 are powered by a power supply 5.

[0022] The other end of the corundum tube 21 is connected to the tube furnace 1. Sulfur is placed inside the corundum tube 21. A second air inlet 24 is provided at the outer end of the corundum tube 21. The second air inlet 24 is connected to the corundum tube 21 by a rubber plug 23.

[0023] The top of the tubular furnace 1 is provided with a tail gas outlet 13.

[0024] In the experiment, 0.3 mol of sulfur was added to the corundum tube 21 of the activated carbon analyzer 2, and 0.5 mol of phosphogypsum was added to the support plate in the tube furnace 1. After the raw materials were placed, the temperature of the tube furnace 1 was set to 850℃ and the temperature of the activated carbon analyzer 2 was set to 450℃.

[0025] Before heating, air from the gas purging device is introduced through the first air inlet 11 and the second air inlet 24.

[0026] First, heat the tube furnace 1. When the temperature of the tube furnace 1 reaches the preset temperature, then heat the activated carbon analyzer 2. Because when the activated carbon analyzer 2 is heated, the sulfur in the corundum tube 21 may decompose to produce S vapor, which reaches the material support plate of the tube furnace 1 under the push of CO2 gas and cannot react with phosphogypsum in time.

[0027] As the temperature of the activated carbon analyzer 2 rises, the carbon dioxide gas flow rate is controlled at 1L / min. After the first thermocouple 22 is heated to 450℃ by the first temperature controller 4, the CO2 gas flow rate is increased to 5L / min, and the gas intake is stopped after two minutes.

[0028] The above experiment was repeated multiple times, and the following experimental results were obtained by measuring samples taken from the material support plate of tube furnace 1:

[0029] Group 1:

[0030]

[0031] Group 2:

[0032]

[0033] Group 3:

[0034]

[0035] Based on the above three sets of experimental data, the CaS yield remained stable at over 20%.

[0036] The above reaction system is a gas-solid reaction controlled by gas flow rate, with a large reaction contact area. Calcium sulfide is produced by reacting sulfur vapor with phosphogypsum. The generated CaS and CaSO4 can continue to undergo a second reaction in a rotary kiln to produce CaO and SO2. The CaO is eventually calcined to form qualified cement clinker, while the SO2 obtained from the reaction can be used for sulfuric acid production. It is efficient, simple, and easy to promote and implement.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A calcium sulfide preparation apparatus based on the reduction decomposition of phosphogypsum using sulfur vapor, characterized in that: Includes a tube furnace (1) and an activated carbon analyzer (2); The tubular furnace (1) is provided with a first air inlet (11) at the bottom end. An activated carbon analyzer (2) is connected to the bottom end of the tubular furnace (1) near the first air inlet (11). An alumina tube (21) is provided inside the activated carbon analyzer (2). A first thermocouple (22) is provided on the inner side of the alumina tube (21). A second air inlet (24) is provided on the outer end of the alumina tube (21). The other end of the corundum tube (21) is connected to the tubular furnace (1), and a second thermocouple (14) is installed inside the tubular furnace (1). The first thermocouple (22) is connected to the first temperature controller (4), and the second thermocouple (14) is connected to the second temperature controller (3). The first temperature controller (4) and the second temperature controller (3) are powered by a power source (5).

2. The apparatus for preparing calcium sulfide based on the reduction decomposition of phosphogypsum using sulfur vapor according to claim 1, characterized in that, The second air inlet (24) is connected to the corundum tube (21) via a rubber plug (23).

3. The apparatus for preparing calcium sulfide based on the reduction decomposition of phosphogypsum using sulfur vapor according to claim 1, characterized in that, The tubular furnace (1) has a feed inlet (12) near the bottom and a tail gas outlet (13) at the top.

4. The apparatus for preparing calcium sulfide based on the reduction decomposition of phosphogypsum using sulfur vapor according to claim 1, characterized in that, The tubular furnace (1) contains phosphogypsum in its support plate, and the activated carbon analyzer contains sulfur in its corundum tube (21).

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