Graphite wastewater treatment system for hot-rolled seamless steel pipe production line

Abstract

The utility model discloses a graphite wastewater treatment system for a hot-rolled seamless steel tube production line and belongs to the technical field of seamless steel tube production. The sedimentation tank is used for filtering and removing impurities and particulate matters in the graphite wastewater of the hot-rolled seamless steel pipe production line in a sedimentation manner; the flotation equipment is used for receiving the graphite wastewater from which the large-particle impurities are removed in the sedimentation tank and capturing and enriching graphite in the graphite wastewater in a foam form under the action of a flotation agent in the flotation equipment; the filter pressing equipment is used for dehydrating and separating foam captured and enriched with graphite in the flotation equipment to obtain graphite; and the drying equipment is used for drying the obtained graphite to obtain graphite particles. Hydrophobic graphite particles of a hot-rolled seamless steel pipe production line are enriched and recycled by means of foam generated by a flotation agent through a flotation method, the graphite particles in graphite wastewater are effectively removed, the influence on a whole turbid circulating water system is avoided, and meanwhile graphite is extracted and recycled for secondary utilization.

Description

Technical Field

[0001] The utility model belongs to the technical field of seamless steel pipe production, in particular to a graphite wastewater treatment system for a hot-rolled seamless steel pipe production line. Background Art

[0002] Graphite has excellent properties such as high temperature resistance, good electrical and thermal conductivity, high lubricity, and hydrophobicity, which makes it widely used in many industrial fields such as metallurgy, machinery, electricity, light industry, and chemical industry.

[0003] The graphite wastewater in the hot rolling production line is discharged from the electrostatic precipitator flushing of the mandrel lubrication system and the exhaust system of the steel pipe workshop. The suspended solids concentration in the wastewater is about 20,000 mg / L, of which graphite accounts for 50%, iron oxide accounts for 20%, and borax accounts for 25%. The structure of graphite in the wastewater is a scaly layered structure, and the particle size is mainly in the range of 1μm-500μm. Because the graphite particles are fine, it is difficult to handle and has a high recycling value. Usually, the graphite wastewater will be directly brought into the turbid circulating water system, and its turbidity and color will have an adverse effect on the operation of the turbid circulating water system, and will also cause a waste of graphite. Utility Model Content

[0004] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the utility model provides a graphite wastewater treatment system for a hot-rolled seamless steel pipe production line, which can treat the graphite wastewater on the hot-rolled seamless steel pipe production line, prevent the graphite wastewater from entering the turbid circulating water system and causing adverse effects on the turbid circulating water system, and at the same time can reuse the recovered graphite to avoid wasting graphite resources.

[0005] The technical solution of the utility model is as follows:

[0006] The utility model provides a graphite wastewater treatment system for a hot-rolled seamless steel pipe production line, comprising:

[0007] Sequentially connected sedimentation tank, flotation equipment, filter press equipment and drying equipment, among which,

[0008] The sedimentation tank is used to filter and remove impurities and particulate matter in the graphite wastewater of the hot-rolled seamless steel pipe production line by sedimentation;

[0009] The flotation device is used to receive the graphite wastewater after the large particle impurities are removed from the sedimentation tank, and to capture and enrich the graphite in the graphite wastewater in the form of foam under the action of the flotation agent in the flotation device;

[0010] The filter press equipment is used to dehydrate and separate the foam captured and enriched with graphite in the flotation equipment to obtain graphite;

[0011] The drying equipment is used to dry the obtained graphite to obtain graphite particles.

[0012] Furthermore, the sedimentation tank includes three sedimentation tanks connected in sequence.

[0013] Furthermore, it also includes a stirring tank, which is arranged between the flotation device and the filter press tank and is used to fully combine the flotation agent foam in the flotation device with the graphite to increase the enrichment content of the flotation agent foam and the graphite.

[0014] Furthermore, the filter press equipment is a filter press dehydrator.

[0015] Furthermore, the drying equipment is a drying machine.

[0016] Furthermore, it also includes a water pump, which, when in use, is used to pump the graphite wastewater from the hot-rolled seamless steel pipe production line that has been precipitated in the sedimentation tank into the flotation tank for capture and enrichment.

[0017] The main advantages of the technical solution of this utility model are as follows:

[0018] The utility model discloses a graphite wastewater treatment system for a hot-rolled seamless steel pipe production line. The hydrophobic graphite particles of the hot-rolled seamless steel pipe production line are enriched and recovered by means of the foam generated by the flotation agent through the flotation method. On the one hand, the graphite particles in the graphite wastewater are effectively removed to avoid the influence on the whole turbid circulating water system. On the other hand, the graphite is extracted and recovered for secondary use, thus realizing the waste recycling and avoiding the waste of graphite. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of a graphite wastewater treatment system for a hot-rolled seamless steel pipe production line according to an embodiment of the utility model;

[0021] Description of reference numerals:

[0022] 1. Sedimentation tank; 2. Flotation equipment; 3. Filter press equipment; 4. Drying equipment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The technical solution provided by the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings.

[0025] As attached Figure 1 As shown, the embodiment of the utility model provides a graphite wastewater treatment system for a hot-rolled seamless steel pipe production line, the system comprising a sedimentation tank 1, a flotation device 2, a filter press device 3 and a drying device 4, wherein:

[0026] Sedimentation tank 1 is used to filter and remove impurities and particulate matter in graphite wastewater from hot-rolled seamless steel pipe production line by sedimentation;

[0027] The flotation device 2 is used to receive the graphite wastewater after the large particle impurities are removed from the sedimentation tank 1, and to capture and enrich the graphite in the graphite wastewater in the form of foam under the action of the flotation agent in the flotation device 2;

[0028] Used to dehydrate and separate the foam captured and enriched with graphite in the flotation device 2 to obtain graphite;

[0029] It is used to dry the obtained graphite to obtain graphite particles.

[0030] Therefore, the utility model provides a graphite wastewater treatment system for a hot-rolled seamless steel pipe production line, which adopts a flotation method to realize the enrichment and recovery of graphite in the graphite wastewater of the hot-rolled seamless steel pipe production line, and at the same time reuses the recovered graphite to avoid the waste of graphite. Specifically, the graphite wastewater of the hot-rolled seamless steel pipe production line is subjected to precipitation to remove impurities and particulate matter, and the graphite in the graphite wastewater is captured and enriched in the foam of the flotation agent by the flotation device 2 under the action of the flotation agent. On the one hand, the graphite can be fully collected, and on the other hand, since the graphite can be combined with the flotation agent, the captured and enriched graphite has high purity and no impurities. Secondly, the captured and enriched graphite is passed through the filter press device 3 to remove the foam and moisture in the graphite, and finally dried by the drying device 4 to obtain dry graphite particles, thereby effectively removing the graphite in the graphite wastewater of the hot-rolled seamless steel pipe production line, greatly reducing the content of graphite, avoiding the adverse effect of the graphite wastewater on the turbid circulating water system when it flows through the turbid circulating water system, and recycling the graphite in the wastewater after being treated by the above system, thereby avoiding the waste of graphite.

[0031] Preferably, the sedimentation tank 1 includes three sedimentation tanks connected in sequence.

[0032] In this way, a three-stage sedimentation tank structure is adopted, so that when the graphite wastewater of the hot-rolled seamless steel pipe production line is precipitated, the larger particles and heavier impurities in the graphite wastewater can be fully and effectively precipitated through step-by-step sedimentation, avoiding excessive impurities from floating and mixing with graphite, reducing the capture amount of flotation agent and graphite in the flotation device 2, and at the same time avoiding the enriched graphite containing more hydrophilic impurity particles.

[0033] Specifically, the total retention time of the three-stage sedimentation tank is 0.5-2.0h, of which the retention time of the first-stage sedimentation is not less than 5min. Surface hydraulic load 1.5-4.5m 3 / (m 2 h), and design an oil removal structure on the upper part of the sedimentation tank, such as a baffle recovery structure, such as setting a groove on the horizontal baffle, one end of the baffle is a free end, and the other end is directly connected to an external oil storage device or the baffle is directly connected to an oil storage device such as an oil barrel. When the water level reaches a certain height, the grease on the water surface is flush with the groove on the baffle, and the oil on the water surface can flow through the groove to the oil barrel or external oil storage device connected to the baffle. At the same time, the sedimentation tank is equipped with a single-beam crane with a grab bucket and a slag pool, which are used to remove steel slag after sedimentation. At the same time, in order to facilitate the outflow of oil from the sedimentation tank, the groove is set as an inclined structure or the baffle is set as an inclined structure.

[0034] It should also be noted that the height of the baffle in the above-mentioned oil removal structure in the sedimentation tank can be adjusted telescopically, and the size and number of the grooves used to discharge oil and other pollutants on the water surface of the sedimentation tank can be adjusted according to the actual amount of oil and pollutants. This arrangement enables the oil removal device to be matched with different sedimentation tanks, thereby achieving a better oil removal effect.

[0035] In some optional implementations of the present embodiment, a multi-stage sedimentation tank including but not limited to a three-stage sedimentation tank may be set up. Secondly, in order to filter out foreign particles more effectively, a filter screen may be set between two adjacent sedimentation tanks 1 to further remove foreign particles. The filter screen may then be rinsed to ensure that the graphite in the sedimentation tank 1 can completely enter the next sedimentation tank 1, thereby avoiding adverse effects on the turbid water system caused by insufficient graphite capture and enrichment.

[0036] In some optional implementations of the present embodiment, the graphite wastewater treatment system of the hot-rolled seamless steel pipe production line of the embodiment of the present application also includes a stirring tank, which is arranged between the flotation device 2 and the filter press tank, and is used to fully combine the foam of the flotation agent in the flotation device 2 with the graphite, thereby increasing the enrichment content of the flotation agent foam and graphite, and the preferred stirring speed is 200-500r / min.

[0037] Specifically, the purpose of stirring is to allow a large amount of air to enter the flotation device 2, so that the air enters the flotation device 2 by stirring, so that the flotation device 2 is inflated, so that the flotation device 2 is covered with flotation agents and enriched with a large amount of air, so that the bubble group generated by the flotation agent and the graphite particles collide in large quantities in the flotation agent mixing area, so that in the flotation area, the mineralized bubbles decrease with the hydrostatic pressure during the stirring and rising process, and the rising speed increases. In the foam area at the top of the flotation device 2, as a large number of mineralized bubbles gather, the bubble rising speed decreases or even stops, and the bubble merger increases. In the merger process, the hydration film breaks and releases part of the water to take away the impurity particles with poor hydrophobicity and weak adsorption added in the foam layer, which plays a secondary enrichment role. The enriched mineralized foam is scraped out by a scraper to form a foam product, so as to achieve the purpose of separating graphite.

[0038] In some optional implementations of the present embodiment, the flotation device 2 is preferably a flotation machine or a flotation column.

[0039] Specifically, during flotation operation, the flotation column feed rate is 0.4-0.6 L / min.

[0040] In some optional implementations of this embodiment, the filter press equipment 3 is a filter press dehydrator.

[0041] In some optional implementations of this embodiment, the drying device 4 is a dryer.

[0042] In addition, in some optional implementations of this embodiment, a water pump is also included to extract and lift the graphite wastewater of the hot-rolled seamless steel pipe production line in the sedimentation tank 1 to the flotation device 2. Specifically, since graphite has natural floatability and is difficult to settle, it can be directly lifted from the wastewater collection tank to the flotation device 2 by a water pump, thereby improving the treatment efficiency of the graphite wastewater of the hot-rolled seamless steel pipe production line and shortening the treatment process of the graphite wastewater of the hot-rolled seamless steel pipe production line.

[0043] In some optional implementations of this embodiment, the flotation device 2 can be set to any flotation device, such as a flotation machine, etc., to obtain, enrich and collect graphite in graphite wastewater of a hot-rolled seamless steel pipe production line.

[0044] Specifically, the present application also provides a hot-rolled seamless steel pipe production line graphite wastewater treatment system, which includes:

[0045] Use sedimentation tanks and other structures to remove impurities and particles from graphite wastewater from hot-rolled seamless steel pipe production lines;

[0046] The graphite wastewater from which impurities and particles have been removed is captured and enriched by a flotation agent to obtain flotation agent foam rich in graphite;

[0047] The flotation agent foam rich in graphite is subjected to filter pressing treatment to obtain dehydrated and defoamed graphite;

[0048] The obtained graphite is dried to obtain graphite particles.

[0049] Therefore, the utility model provides a graphite wastewater treatment system for a hot-rolled seamless steel pipe production line, which adopts the processes of precipitation removal, capture enrichment, filter pressing and drying treatment to effectively remove graphite particles in the graphite wastewater, and at the same time extracts and recycles the graphite for secondary utilization, thus avoiding affecting the entire turbid water system, realizing waste recycling and avoiding graphite waste.

[0050] Specifically, the flotation agent includes a collector and a frother, wherein the collector is kerosene with a content of 120 g / t, and the frother is 2# oil with a content of 60 g / t.

[0051] Specifically, the graphite wastewater treatment system of the hot-rolled seamless steel pipe production line in the embodiment of the present application also includes stirring the graphite wastewater to which the flotation agent is added for capture and enrichment, so as to perform secondary enrichment of the graphite.

[0052] Preferably, the stirring speed is 200-500 r / min.

[0053] With such arrangement, the bubble groups and graphite particles collide in large numbers in the mixing zone of the flotation machine by stirring. In the flotation zone, the mineralized bubbles increase in the rising process as the hydrostatic pressure decreases, and the rising speed decreases or even stops as a large number of mineralized bubbles gather in the foam, and the merger of bubbles increases. In the merger process, the hydration film ruptures and releases part of the water to carry away the impurity particles with poor hydrophobicity and weak adhesion added in the foam layer, thereby playing a secondary enrichment role.

[0054] In some optional implementations of this embodiment, when capturing and enriching graphite by means of a flotation agent, the operation may be repeated multiple times, which may be 1 to 8 times, preferably 5 times, and most preferably 3 times.

[0055] With such arrangement, the graphite can be captured and enriched more fully through multiple cycles of treatment. Secondly, more graphite can be collected to avoid graphite waste, and the turbid circulating water system can be better protected from pollution. Secondly, by optimizing the method of 3 times, while achieving the above effects, the treatment efficiency of graphite wastewater in the hot-rolled seamless steel pipe production line can also be guaranteed.

[0056] In summary, in the embodiment of the present application, the principle of treating and recovering graphite in graphite wastewater of hot-rolled seamless steel pipe production line is as follows:

[0057] Graphite wastewater enters the tertiary sedimentation tank 1 through the slag flushing ditch to remove steel slag particles with larger specific gravity; at the same time, it is lifted from the wastewater collection tank to the flotation equipment 2 or flotation machine and other equipment by a water pump, and a flotation agent with 120g / t kerosene as a collector and 60g / t 2# oil as a frother is added. The wastewater treated with the reagent is stirred and aerated, and the bubble group and graphite particles collide in large quantities in the mixing area of ​​the flotation machine. In the flotation area, the mineralized bubbles increase in the process of rising as the hydrostatic pressure decreases, and the rising speed of the bubbles decreases or even stops as a large number of mineralized bubbles gather to the foam, and the bubble merger increases. During the merger process, the hydration film breaks and releases part of the water to take away the impurity particles with poor hydrophobicity and weak adsorption added in the foam layer, which plays a secondary enrichment role; the enriched mineralized foam is scraped out by a scraper to form a foam product to achieve the purpose of separating graphite. At the same time, multiple flotation operations are performed according to the flotation process and the flotation conditions of graphite to fully separate the graphite in the wastewater. The separated graphite is dehydrated and dried by a belt filter press to obtain recyclable graphite. The treated graphite wastewater enters the turbid water treatment system for treatment and then reused. This solves the defects in the existing technology, ensures the safety of the turbid water system and avoids the waste of graphite resources.

[0058] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A graphite wastewater treatment system for a hot-rolled seamless steel pipe production line, characterized in that: include: Sequentially connected sedimentation tank, flotation equipment, filter press equipment and drying equipment, among which, The sedimentation tank is used to filter and remove impurities and particulate matter in the graphite wastewater of the hot-rolled seamless steel pipe production line by sedimentation; The flotation device is used to receive the graphite wastewater after the large particle impurities are removed from the sedimentation tank, and to capture and enrich the graphite in the graphite wastewater in the form of foam under the action of the flotation agent in the flotation device; The filter press equipment is used to dehydrate and separate the foam captured and enriched with graphite in the flotation equipment to obtain graphite; The drying equipment is used to dry the obtained graphite to obtain graphite particles; The sedimentation tank comprises three sedimentation tanks connected in sequence; It also includes a stirring tank, which is arranged between the flotation device and the filter press tank and is used to fully combine the flotation agent foam in the flotation device with the graphite to increase the enrichment content of the flotation agent foam and the graphite.

2. A graphite wastewater treatment system for a hot-rolled seamless steel pipe production line according to claim 1, characterized in that: The filter press equipment is a filter press dehydrator.

3. The graphite wastewater treatment system for hot-rolled seamless steel pipe production line according to claim 1 is characterized in that: The drying equipment is a drying machine.

4. The graphite wastewater treatment system for hot-rolled seamless steel pipe production line according to claim 1 is characterized in that: It also includes a water pump, which, when in use, is used to pump the graphite wastewater from the hot-rolled seamless steel pipe production line after precipitation in the precipitation tank into the flotation tank for capture and enrichment.

Images