Treatment method of mineral processing waste gas

Abstract

The invention belongs to the field of smelting, and particularly relates to a beneficiation waste gas treatment method which comprises the following steps: collecting waste gas generated in a beneficiation process, conveying the waste gas to a slag slow cooling field, and reacting high-temperature steam generated by slag slow cooling with the waste gas to realize waste gas treatment. According to the scheme, heat generated in the slow cooling process of the cinder ladle is utilized, waste gas is treated in the most efficient and cleaner mode, in other words, harmful waste gas is completely harmless, waste is treated with waste, and the treatment process is simple and easy to operate.

Description

Technical Field

[0001] The invention belongs to the field of smelting, and in particular relates to a method for treating ore dressing waste gas. Background Art

[0002] A large amount of waste gas is generated during the mineral processing process. The main sources of waste gas are: ① Waste gas with pungent odor volatilized from the mineral processing agent xanthate, the main components of which are carbon disulfide, a small amount of hydrogen sulfide and organic matter; ② Dust waste gas volatilized from the high-temperature slurry after ball milling, the main components of which are water vapor, free silicon dioxide and organic matter. These waste gases volatilize into the mill-floatation plant, affecting the surrounding air quality and the working environment of the mill-floatation plant employees. However, the existing technology has not effectively treated this waste gas.

[0003] Therefore, how to deal with waste gas in mineral processing production is an urgent problem that needs to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a method for treating ore dressing waste gas, which utilizes high-temperature steam generated during the slag slow cooling process to purify the ore dressing waste gas, thereby achieving waste treatment with waste.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a method for treating mineral processing waste gas, characterized in that: the waste gas generated in the mineral processing process is collected and transported to the slag slow cooling field, so that the high-temperature steam generated by the slag slow cooling reacts with the waste gas to achieve waste gas treatment.

[0006] In the above scheme, the high-temperature steam generated during the slow cooling of the slag is used to treat the waste gas from the ore dressing. Through high-temperature heating reaction, the carbon disulfide in the waste gas is converted into sulfur dioxide and carbon dioxide, and the hydrogen sulfide is converted into water and sulfur dioxide after high-temperature combustion. The sulfur dioxide reacts with oxygen to produce sulfur trioxide, and sulfur trioxide reacts with water to produce sulfuric acid. The sulfuric acid reacts with the metal oxides (MgO, CaO, Al2O3, etc.) in the copper slag to convert into sulfate (MeSO4). The sulfate and other dust fall into the slag bag below and enter the next production process as part of the copper smelting slag. This scheme uses the heat generated during the slow cooling of the slag bag to treat the waste gas in the most efficient and clean way. It can be said that the harmful waste gas is completely harmless, which not only achieves waste treatment with waste, but also the treatment process is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the method for treating waste gas according to the present invention, wherein:

[0008] 10-flotation machine, 20-dosing machine, 30-negative pressure gas collecting hood, 40-high temperature steam hood, A-slag bag in the slag slow cooling area. DETAILED DESCRIPTION

[0009] The technical solution of the present invention is further described in detail below in conjunction with embodiments.

[0010] A method for treating waste gas from mineral processing, which collects waste gas generated during mineral processing and transports it to a slag slow cooling field, so that high-temperature steam generated by the slag slow cooling reacts with the waste gas to achieve waste gas treatment.

[0011] Specifically, a negative pressure gas collecting hood 30 is provided for the equipment generating waste gas in the grinding and flotation plant, and the waste gas is transported to the slag slow cooling field. The equipment generating waste gas includes a flotation machine 10 and a dosing machine 20. The main component of the waste gas, carbon disulfide, and a small amount of hydrogen sulfide are mainly generated in the dosing process, as shown in the data records in Table 1 for details.

[0012] A high-temperature steam hood is arranged above the slag bag A in the slag slow cooling field, and the gas outlet of the negative pressure gas collecting hood of the grinding and flotation plant extends to the area surrounded by the high-temperature steam hood 40. The high-temperature steam hood 40 is a ceiling or other similar structure arranged above the slag bag, and only needs to temporarily gather the high-temperature steam so that the exhaust gas transported from the grinding and flotation plant can contact the high-temperature steam.

[0013] When the steam temperature in the high-temperature steam hood is in the range of 800-1000℃, the waste gas produced by the grinding and flotation plant is transported to the high-temperature steam hood. The high-temperature steam produced during the slag slow cooling process will gradually decrease as the slag temperature decreases. In order to achieve a better treatment effect of the waste gas, the waste gas can be treated when the steam temperature is higher.

[0014] The method of the present invention utilizes negative pressure to collect waste gas in the grinding and flotation plant, and the waste gas collected by negative pressure is transported to the copper smelting slag in slow cooling through the air duct. A gas collecting hood (high-temperature steam hood) is arranged above the copper smelting slag to collect the collected waste gas in the gas collecting hood. The copper smelting slag releases heat during the slow cooling process to generate a large amount of high-temperature steam (800-1000°C). The carbon disulfide in the waste gas reacts at high temperature to produce sulfur dioxide (SO2) and carbon dioxide (CO2), and the hydrogen sulfide is decomposed into Water (H2O) and sulfur dioxide (SO2), sulfur dioxide (SO2) reacts with oxygen (O2) to produce sulfur trioxide (SO3), sulfur trioxide (SO3) reacts with water (H2O) to produce sulfuric acid (H2SO4), sulfuric acid (H2SO4) reacts with metal oxides (MgO, CaO, Al2O3, etc.) in copper slag to produce sulfate (MeSO4), sulfate and other dust fall into the slag bag below and enter the next production process as part of the copper smelting slag. This solution can use the heat generated during the slow cooling of the slag bag to treat the waste gas in the most efficient and clean way. Attached are the reaction equations for each stage:

[0015] CS2+3O2=2SO2+CO2

[0016] 2H2S+3O2=2H2O+2SO2

[0017] SO2+2O2=2SO3

[0018] SO3+H2O=H2SO4

[0019] H2SO4+MeO=MeSO4+H2O

[0020] Example

[0021] The above method was used to treat the exhaust gas from the grinding and flotation plant. The concentration of carbon disulfide in the exhaust gas was tested before and after the treatment. The data records are shown in Table 1:

[0022] Table 1 Carbon disulfide test concentration before and after exhaust gas treatment

[0023]

[0024]

[0025] From the above data, it can be seen that the technical solution of the present invention uses the high-temperature steam generated during the slag slow cooling process to treat the waste gas generated by the grinding and flotation plant, which greatly reduces the concentration of carbon disulfide in the waste gas. Other components have not been detected after testing. It can be seen that the solution of the present invention is effective. It not only reuses the slag slow cooling high-temperature steam that should have volatilized and dissipated, avoiding energy waste, but also thoroughly treats the waste gas produced by the grinding and flotation plant, realizing waste treatment with waste, and the environment of the grinding and flotation plant is also improved. The solution of the present invention is simple to operate, low in cost, in line with the concept of environmental protection, and suitable for vigorous promotion in smelting enterprises.

Claims

1. A method for treating mineral processing waste gas, characterized in that: The waste gas generated during the mineral processing process is collected and transported to the slag slow cooling field, so that the high-temperature steam generated by the slag slow cooling can react with the waste gas to achieve waste gas treatment.

2. The method for treating ore dressing waste gas according to claim 1, characterized in that: A negative pressure gas collecting hood (30) is provided for the equipment generating waste gas in the grinding and flotation workshop, and the waste gas is transported to the slag slow cooling field through the air duct.

3. The method for treating ore dressing waste gas according to claim 2, characterized in that: The equipment that generates waste gas in the grinding and flotation plant includes a flotation machine (10) and a dosing machine (20).

4. The method for treating ore dressing waste gas according to claim 1, characterized in that: A high-temperature steam hood (40) is arranged above the slag bag (A) in the slag slow cooling field, and the gas outlet of the negative pressure gas collecting hood of the grinding and flotation plant extends to the area surrounded by the high-temperature steam hood.

5. The method for treating ore dressing waste gas according to claim 4, characterized in that: When the steam temperature in the high-temperature steam hood (40) is in the range of 800-1000°C, the waste gas produced by the grinding and flotation plant is transported into the high-temperature steam hood (40).

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