Efficient collection and deep treatment method for beneficiation reagent waste gas

Abstract

The invention discloses an efficient collection and deep treatment method for beneficiation reagent waste gas, and relates to the technical field of waste gas treatment, and the method comprises the following steps: manufacturing a waste gas collection cover, sealing a whole set of equipment for generating waste gas, and conveying the waste gas to a rotational flow tower for spraying and purifying; then conveying the waste gas to a demister for demisting and purifying; then the waste gas is conveyed to a mechanical purifier to be filtered and purified; finally, the waste gas is conveyed into an activated carbon box to be adsorbed and purified. The closed local waste gas collecting cover is adopted, and compared with traditional workshop overall ventilation, the total amount of treated waste gas can be reduced, operation energy consumption is remarkably reduced, and equipment investment is saved. Through the synergistic effect of local closed gas collection, rotational flow spraying purification, multi-stage demisting drying, mechanical interception filtration and activated carbon adsorption, efficient collection and deep purification treatment of beneficiation reagent waste gas are achieved, and particulate matter, oil mist and VOCs in the waste gas are efficiently removed.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and particularly relates to a method for efficient collection and deep treatment of waste gas from ore dressing agents. Background Art

[0002] Ore dressing is a process of separating useful minerals from gangue by using the physical or chemical property differences of different minerals in ore, through preparatory operations such as crushing and grinding, and adopting methods such as gravity separation, magnetic separation, and flotation to enrich the useful components and improve the ore grade. Through ore dressing, the grade of ore can be effectively improved, the comprehensive utilization of resources can be realized, and the costs of smelting and subsequent processing can be reduced. The development of ore dressing technology is of great significance to the development of mineral resources and the national economy.

[0003] At present, most ore dressing sites are equipped with workshops such as ore crushing, screening, grinding, molybdenum flotation, concentrate dewatering, pre-factory thickening, reagent preparation and addition, and flocculant preparation, as well as auxiliary facilities such as raw ore bins, powdered ore bins, concentrate yards, and laboratories. The grinding and flotation workshop has a strong odor, and the odor mainly comes from the volatilization and diffusion of kerosene and pine oil used as main flotation reagents in ore dressing production to the workshop. Its components include a small amount of volatile organic compounds in the reagent and other organic compounds brought out, which has a relatively serious impact on the working environment of the factory area, and the production environment urgently needs to be improved.

[0004] Traditional methods for treating waste gas from ore dressing agents usually collect it in an unorganized manner throughout the workshop, resulting in too large a treatment air volume, increasing equipment investment and operating energy consumption. Moreover, the traditional waste gas treatment methods have a relatively single process flow, making it difficult to thoroughly purify the waste gas. At the same time, secondary pollution may also be generated during the waste gas treatment process, and it is impossible to achieve efficient purification of waste gas from ore dressing agents, and significant environmental and economic benefits cannot be brought. Therefore, the present invention proposes a method for efficient collection and deep treatment of waste gas from ore dressing agents to solve the problems existing in the prior art. Summary of the Invention

[0005] In view of the above problems, the object of the present invention is to propose a method for efficient collection and deep treatment of waste gas from ore dressing agents, which solves the problems of high energy consumption, inability to thoroughly purify waste gas, and possible generation of secondary pollution existing in traditional methods for treating waste gas from ore dressing agents.

[0006] To achieve the object of the present invention, the present invention is realized through the following technical solutions: A method for efficient collection and deep treatment of waste gas from ore dressing agents includes the following steps:

[0007] Step 1: Pre-fabricate a spliced waste gas collection hood to seal the entire set of equipment that generates waste gas from ore dressing agents to collect the waste gas, and connect the waste gas collection hood, cyclone tower, demister, mechanical purifier, and activated carbon box through a pre-fabricated air duct;

[0008] Step 2: The waste gas converged by the waste gas collection hood is transported from the flue to the cyclone tower through the air duct. In the cyclone tower, through countercurrent gas-liquid contact, the particulate matter and the organic waste gas soluble in water in the waste gas are removed.

[0009] Step 3: The waste gas treated by the cyclone tower spray is transported to the demister through the air duct, and the demister is used to filter out the water vapor in the waste gas.

[0010] Step 4: The waste gas filtered by the demister is transported to the mechanical purifier through the air duct. The mechanical purifier is used to remove the particulate matter and oil mist that were not removed by the cyclone tower in the waste gas, and at the same time filter the remaining water vapor in the waste gas.

[0011] Step 5: The waste gas purified by the mechanical purifier is transported to the activated carbon box through the air duct. The activated carbon box is used to adsorb and purify the waste gas. The qualified gas after adsorption is discharged into the atmosphere from the flue through the chimney.

[0012] Further improvement lies in: in the above Step 1, an observation window and a maintenance opening are reserved during the production of the waste gas collection hood. During installation, it is installed in a split-splicing manner by region to form an overall sealed structure, and a wind valve is installed at the end air duct of each waste gas collection hood.

[0013] Further improvement lies in: in the above Step 1, the air duct elbow is made of stainless steel, the curvature radius at the elbow is 1.5D, and a placement space and an operation space are reserved at the elbow.

[0014] Further improvement lies in: in the above Step 2, the cyclone tower is made of fiberglass. The specific treatment process for the waste gas is as follows: the waste gas spirally rises through the tower plate, the liquid flow is distributed from the blind plate to each blade to form a thin film layer, and at the same time it is sprayed into liquid droplets by the air flow. The liquid droplets are thrown towards the tower wall by the centrifugal force, forming a downward rotating liquid circulation to the liquid collection tank, and then flowing to the blind plate of the next tower plate through the overflow port for multi-stage washing.

[0015] Further improvement lies in: in the above Step 3, the demister is a corrugated plate demister. When the waste gas containing mist droplets output from the cyclone tower flows through the demister, due to the inertial impact of the gas, the mist droplets in the waste gas collide with the demister blades and are trapped. The mist droplets gather to form a water flow, and due to the action of gravity, it falls into the slurry pool, realizing gas-liquid separation, so that the waste gas flowing through the demister meets the demisting requirements and then is discharged.

[0016] Further improvement lies in: in the above Step 4, the mechanical purifier is made of carbon steel. The whole filtration process of the waste gas is divided into primary filtration, secondary filtration and tertiary filtration. Among them, the primary filtration is a stainless steel wire mesh, the secondary filtration is a P-class medium-efficiency G4 filter element made of PP material, and the tertiary filtration uses a self-cleaning composite glass fiber filter element.

[0017] A further improvement lies in that: in the fifth step, the activated carbon box is made of carbon steel. When adsorbing and purifying the waste gas, the gravitational force generated by the molecules on the micropores of the activated carbon adsorbs the organic molecules in the waste gas inside the micropores of the activated carbon, separating the organic matter and air in the waste gas, and realizing the purification of the organic waste gas.

[0018] A further improvement lies in that: the treatment air volume of the cyclone tower is 24000m 3 / h, the treatment air volume of the demister is 24000m 3 / h, the treatment air volume of the mechanical purifier is 24000m 3 / h, and the treatment air volume of the activated carbon box is 24000m 3 / h.

[0019] The beneficial effects of the present invention are as follows: through the closed local waste gas collection hood, compared with the traditional overall workshop ventilation, the total amount of waste gas to be treated can be reduced, significantly saving the operation energy consumption and reducing the equipment investment. Through the synergistic effects of local closed gas collection, cyclone spray purification, multi-stage demisting and drying, mechanical interception and filtration, and activated carbon adsorption, the efficient collection and deep purification treatment of the ore dressing reagent waste gas are realized. It can efficiently remove particulate matter, oil mist and VOCs in the waste gas, solving the problems of high energy consumption and easy generation of secondary pollution in the traditional waste gas treatment process. It can be well applied to the economical treatment of the ore dressing flotation workshop reagent waste gas, realizing the transformation from unorganized emission to organized and low-concentration emission, significantly improving the workshop operation environment, and providing a solid guarantee for occupational disease prevention and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic flow chart of the method for efficient collection and deep treatment of the ore dressing reagent waste gas of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] In view of the booming development and technological progress of the ore dressing industry, although the extensive application of ore dressing reagents has improved the ore dressing efficiency, the problem of unorganized emission of volatile organic compounds (VOCs) accompanying it has become increasingly prominent, becoming the key bottleneck restricting the green and sustainable development of the industry. Such VOC emissions not only seriously deteriorate the air quality of the operation environment, but also pose a risk of irreversible damage to the health of employees.

[0023] See Figure 1, this embodiment provides an efficient collection and deep treatment method for beneficiation reagent waste gas, including the following steps:

[0024] Step 1: According to the actual size of the whole set of equipment that generates beneficiation reagent waste gas, a spliced waste gas collection hood is prefabricated, the whole set of equipment (workshop flotation machine) that generates beneficiation reagent waste gas is sealed, and the waste gas collection hood, cyclone tower, demister, mechanical purifier and activated carbon box are connected through prefabricated air ducts, so that the waste gas can be transported and circulated, which can not only achieve the purpose of accurately collecting waste gas, but also avoid excessive treatment air volume caused by unorganized collection of the whole workshop, increasing the construction cost;

[0025] The waste gas collection hood in this embodiment is made of stainless steel, with a surface that is not easily contaminated and easy to clean. The height is controlled at 0.5m. When manufacturing, an observation window and a maintenance port are custom-made and reserved for regular maintenance and repair work. When installing, the waste gas collection hood is installed in a split-spliced manner by area to achieve an overall sealed structure of the equipment, reduce air volume loss and achieve the optimal collection purpose. And a wind valve is installed at the end air duct of each waste gas collection hood (the air volume is controlled at 24000m 3 / h). During the shutdown or maintenance of a single separation column of the flotation machine, the air volume can be adjusted through the wind valve to reduce the load of the subsequent treatment equipment;

[0026] The air duct in this embodiment is made of stainless steel. Considering the pipe fixation and stress parts from the aspects of firmness and noise, reinforcing ribs are applied at the processing parts for reinforcement. The diameter of the main pipe is 70cm, the diameter of the secondary pipe is 20cm, and the curvature radius of the air duct elbow is 1.5D. If it is too small, the air duct resistance will increase, and a placement space and an operation space should be reserved at the elbow;

[0027] Step 2: The waste gas converged by the waste gas collection hood is transported from the flue to the next treatment process through the air duct, that is, the cyclone tower (the treatment air volume is 24000m 3 / h). The waste gas undergoes countercurrent gas-liquid contact in the cyclone tower, so that most of the particulate matter and part of the organic waste gas soluble in water in the waste gas are removed;

[0028] The cyclone tower in this embodiment is made of fiberglass, which is corrosion-resistant and more environmentally friendly, increasing the service life. The waste gas spirally rises through the internal tower plate of the cyclone tower, and the liquid flow is distributed from the blind plate to each blade to form a thin film layer, and at the same time is sprayed into liquid droplets by the air flow. The liquid droplets are then thrown towards the tower wall by centrifugal force to form a downward rotating liquid circulation to the liquid collection tank, and then flow to the blind plate of the next tower plate through the overflow port for multi-stage washing. The particulate matter in the waste gas is captured by the liquid droplets during the air flow movement and is adhered again by the liquid circulation on the tower wall. The waste gas dust removal efficiency is very high;

[0029] Step 3: The waste gas treated by spraying in the cyclone tower is transported to the next treatment process through the air duct, that is, the corrugated plate demister (the treatment air volume is 24000m 3 / h), the demister is used to filter out the water vapor in the waste gas. When the waste gas containing mist flows through the corrugated plate demister at a certain speed, due to the inertial impact of the gas, the mist collides with the corrugated plates in the corrugated plate demister and is aggregated. When the liquid droplets grow large enough so that the gravity generated by themselves exceeds the resultant force of the upward force of the gas and the liquid surface tension, the liquid droplets are separated from the surface of the corrugated plate. The multi-fold structure of the corrugated plate increases the chance of mist being captured. The mist that is not removed is captured through the same action at the next turning point. Through repeated actions, the demisting efficiency is greatly improved. After the waste gas passes through the corrugated plate demister, it basically contains no mist. The specific demisting steps are as follows: The waste gas passes through the curved channel of the demister, and the liquid droplets entrained in the gas flow are separated under the action of inertial force and gravity: The waste gas flows through the corrugated plate demister at a certain speed, and the waste gas is quickly and continuously changed in the direction of motion. Due to the action of centrifugal force and inertia, the mist droplets in the waste gas collide with the blades in the corrugated plate demister and are captured. The mist droplets gather to form a water flow, and due to the action of gravity, it falls into the slurry pool, realizing gas-liquid separation, so that the waste gas flowing through the demister is discharged after meeting the demisting requirements;

[0030] Step Four: The waste gas filtered and treated by the demister is transported to the next process through the air duct, that is, the mechanical purifier (the processing air volume is 24000m 3 / h). The mechanical purifier is used to remove the particulate matter and oil mist that were not removed by the cyclone tower in the waste gas, and at the same time filter the remaining water vapor in the waste gas, increasing the adsorption effect and service life of the subsequent activated carbon. Compared with the traditional high-voltage electric field method for removing oil mist, this method can avoid the risk of fire and explosion caused by the enrichment of flammable substances such as kerosene in the waste gas, and at the same time can reduce the load of the end activated carbon for adsorbing organic waste gas;

[0031] The mechanical purifier in this embodiment is made of carbon steel, and a special paint is coated on the outside to increase the service life of the equipment. The entire filtration process is divided into three levels of filtration. Among them, the first-level filtration is a stainless steel wire mesh, the second-level filtration is a P-class medium-efficiency G4 filter element made of PP material, and the third-level filtration uses a self-cleaning composite glass fiber filter element. The oil mist purification efficiency reaches 97%, and at the same time, a fourth-level filtration space is reserved. The material is modified, the oil drainage effect is better, the purification efficiency is higher, and the resistance rises more slowly, a centralized oil mist purifier;

[0032] The waste gas is inhaled through the air inlet below the mechanical purifier and passes through the composite self-cleaning filter element. Thus, up to 97% of the oil mist particles are captured. When the filter element reaches saturation, the dripping return liquid is led out through the filter for recirculation;

[0033] Step Five: The waste gas purified by the mechanical purifier is transported to the next process through the flue and the air duct, that is, the activated carbon box (the processing air volume is 24000m 3 / h), the waste gas is adsorbed and purified by the activated carbon box. The qualified gas after adsorption treatment is discharged into the atmosphere through the chimney. The waste gas removal rate reaches over 80%, and the outlet concentration is lower than 80 mg / m 3 , meeting the required emission standards;

[0034] The activated carbon box in this embodiment is made of carbon steel, and a special paint is coated on the outside to increase the service life of the equipment. The working principle of the activated carbon is that there are a large number of microporous structures on the surface of the activated carbon, thus providing a large surface area. Also, because there is mutual attraction between all molecules, a strong attraction is generated by a large number of molecules on the micropores of the activated carbon to adsorb the organic molecules in the waste gas inside the micropores of the activated carbon, so as to separate the organic matter and air in the waste gas by using the adsorption performance of the activated carbon, thereby achieving the purpose of purifying the organic waste gas.

[0035] After being treated by the method for efficient collection and deep treatment of ore reagent waste gas in this embodiment, the waste gas meets the following standards:

[0036] The secondary emission standard of the Integrated Emission Standard of Air Pollutants (GB16297 - 1996);

[0037]

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An efficient collection and in-depth treatment method for the waste gas of ore dressing reagents, characterized in that It includes the following steps: Step 1: Pre-fabricate a spliced exhaust gas collection hood, seal the entire set of equipment that generates ore dressing reagent exhaust gas, collect the exhaust gas through the exhaust gas collection hood, and connect the exhaust gas collection hood, cyclone tower, demister, mechanical purifier, and activated carbon box through an air duct; Step 2: The exhaust gas converged by the exhaust gas collection hood is transported from the air duct to the cyclone tower via a flue. In the cyclone tower, through gas-liquid countercurrent contact, the particulate matter and water-soluble organic exhaust gas in the exhaust gas are removed; Step 3: The exhaust gas treated by spraying in the cyclone tower is transported to the demister through the air duct, and the demister is used to filter out the water vapor in the exhaust gas; Step 4: The exhaust gas after filtration treatment is transported to the mechanical purifier through the air duct. The mechanical purifier is used to remove the particulate matter and oil mist in the exhaust gas that were not removed by the cyclone tower, and at the same time filter out the remaining water vapor in the exhaust gas; Step 5: The exhaust gas purified by the mechanical purifier is transported to the activated carbon box through the air duct. The activated carbon box is used to adsorb and purify the exhaust gas. The qualified gas after adsorption is discharged into the atmosphere from the flue through the chimney.

2. The high-efficiency collection and in-depth treatment method for the waste gas of ore dressing reagent according to claim 1, wherein: In the above Step 1, an observation window and a maintenance opening are reserved during the production of the exhaust gas collection hood. During installation, it is installed in a split-spliced manner by area to form an overall sealed structure, and a wind valve is installed at the end air duct of each exhaust gas collection hood.

3. The high-efficiency collection and in-depth treatment method for the waste gas of ore dressing reagent according to claim 1, characterized in that: In the above Step 1, the air duct elbow is made of stainless steel, the curvature radius at the elbow is 1.5D, and a placement space and an operation space are reserved at the elbow.

4. The high-efficient collection and in-depth treatment method for waste gas of ore dressing reagent according to claim 1, characterized in that: In the above Step 2, the cyclone tower is made of fiberglass. The specific treatment process for the exhaust gas is as follows: The exhaust gas spirally rises through the tower plate, the liquid flow is distributed from the blind plate to each blade to form a thin film layer, and at the same time is sprayed into liquid droplets by the air flow. The liquid droplets are thrown to the tower wall by centrifugal force, forming a downward rotating liquid circulation to the liquid collection tank, and then flowing to the blind plate of the next tower plate through the overflow port for multi-stage washing.

5. The high-efficiency collection and in-depth treatment method for the waste gas of ore dressing reagent according to claim 1, characterized in that: In the above Step 3, the demister is a corrugated plate demister. When the exhaust gas containing mist droplets output from the cyclone tower flows through the demister, due to the inertial impact of the gas, the mist droplets in the exhaust gas hit the demister blades and are trapped. The mist droplets gather to form a water flow, and due to the action of gravity, it falls into the slurry pool, realizing gas-liquid separation, so that the exhaust gas flowing through the demister meets the demisting requirements and then is discharged.

6. The high-efficiency collection and in-depth treatment method for the waste gas of ore dressing reagent according to claim 1, characterized in that: In the above Step 4, the mechanical purifier is made of carbon steel. The entire filtration process of the exhaust gas is divided into primary filtration, secondary filtration, and tertiary filtration. Among them, the primary filtration is a stainless steel wire mesh, the secondary filtration is a P-class medium-efficiency G4 filter element made of PP material, and the tertiary filtration uses a self-cleaning composite glass fiber filter element.

7. The high-efficiency collection and in-depth treatment method for the waste gas of ore dressing reagent according to claim 1, characterized in that: In the above Step 5, the activated carbon box is made of carbon steel. When adsorbing and purifying the exhaust gas, the molecular attraction generated on the micropores of the activated carbon adsorbs the organic molecules in the exhaust gas inside the micropores of the activated carbon, separating the organic matter and air in the exhaust gas, and realizing the purification of the organic exhaust gas.

8. The high-efficiency collection and in-depth treatment method for waste gas of ore dressing reagent according to claim 1, wherein: The treatment air volume of the cyclone tower is 24,000 m 3 / h, the treatment air volume of the demister is 24,000 m 3 / h, the treatment air volume of the mechanical purifier is 24,000 m 3 / h, the treatment air volume of the activated carbon box is 24,000 m 3 / h.

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