Rotational flow filtration dehydration process and system for blast furnace granulated slag

Abstract

The invention relates to a blast furnace water slag rotational flow filtration dehydration process and system, and belongs to the technical field of blast furnace water slag dehydration. The process comprises the following steps: obtaining a slag-water mixture as a to-be-separated object; the slag-water mixture is subjected to rotational flow filtration dehydration, solid-liquid two-phase filtration dehydration of slag and water is achieved based on density or particle size difference by means of centrifugal force generated by fluid rotation, and top flow water and bottom flow slag are obtained; and collecting the top flow water and the bottom flow slag respectively. According to the method, granulating slag dehydration and size grading are realized by adopting a rotational flow filtering dehydration principle, physical interception type filtering equipment in the prior art is replaced, and the problem that the equipment needs to be frequently cleaned or maintained due to the fact that a filter is blocked by slag is effectively avoided; and meanwhile, the process method provided by the invention has no requirement on the water quality of the prepared slag-water mixture, and is wider in applicability.

Description

Technical Field

[0001] The present application relates to the technical field of blast furnace slag filtration and dehydration, and in particular to a blast furnace slag cyclone filtration and dehydration process and system. Background Art

[0002] Blast furnace slag is a solid waste generated during the steelmaking process. Its main components include CaO, MgO, Al2O3, and MnO. To achieve resource utilization, it needs to be processed. The most common method currently is water quenching. Water quenching processes are divided into two categories: precipitation filtration and mechanical filtration. Sedimentation filtration includes sedimentation tanks, bottom filtration (OCP), and the Lhasa process (RASA). Mechanical filtration includes the Inba process (INBA), the Tula process (TYNA), and the Mente process (MTC).

[0003] The above methods all use physical interception mechanical filtration facilities, which have high requirements on the water quality of slag flushing water. If the blast furnace slag flushing system absorbs wastewater, the high concentration of chloride ions, sulfate ions, etc. in the slag flushing water will combine with the residue, resulting in a series of problems such as severe compaction, severe foam slag, a lot of slag cotton suspended matter, and severe corrosion and wear of equipment, which seriously affect the slag water filtration and dehydration effect, and cause blockage of mechanical filtration facilities, pipelines, water tanks, and return water wells, and return water delays. Summary of the Invention

[0004] The present application provides a blast furnace slag cyclone filtration and dehydration process and system to solve the following technical problem: how to improve the blast furnace slag filtration and dehydration efficiency.

[0005] In a first aspect, the present invention provides a blast furnace slag filtration and dehydration process, comprising the following steps:

[0006] Obtaining a slag-water mixture;

[0007] The slag-water mixture is subjected to cyclone filtration and dehydration to separate the slag and water to obtain top-flow water and bottom-flow slag;

[0008] The top flow water and the bottom flow slag are collected separately.

[0009] Optionally, the slag-water mixture is subjected to cyclone filtration and dehydration to separate the slag and water to obtain top-flow water and bottom-flow slag, specifically comprising:

[0010] The slag-water mixture is input into a cyclone filtration and dehydration unit to form a rotating fluid. The centrifugal force generated by the fluid rotation is used to achieve solid-liquid two-phase filtration and dehydration of the slag and water based on density or particle size differences to obtain top flow water and bottom flow slag.

[0011] Optionally, the method further comprises: recovering the top flow water for preparing a slag-water mixture.

[0012] In a second aspect, an embodiment of the present application provides a blast furnace slag cyclone filtration and dehydration system for implementing the blast furnace slag filtration and dehydration process described in the first aspect, the blast furnace slag filtration and dehydration system comprising:

[0013] A granulation unit for granulating and water-quenching blast furnace slag to prepare a slag-water mixture;

[0014] A feeding unit, used for collecting the slag-water mixture and pressurizing the slag-water mixture to supply it to a cyclone filtration and dehydration unit;

[0015] A cyclone filtration and dehydration unit, comprising one or more cyclone filtration and dehydration devices, for filtering and dehydrating the slag-water mixture to obtain bottom flow slag and top flow water;

[0016] a water collecting device connected to the water outlet of the cyclone filtration and dehydration system and used for collecting the top flow water;

[0017] The slag discharge device is connected to the slag discharge port of the cyclone filtration and dehydration system and is used to collect the bottom flow slag.

[0018] Optionally, the cyclone filtration and dehydration system includes N groups of cyclone filtration and dehydrator groups connected in parallel and / or in series, and each group of cyclone filtration and dehydrator groups includes i cyclone filtration and dehydration devices connected in parallel and / or in series, wherein the value of N is 1, 2, 3…, and the value of i is 1, 2, 3….

[0019] Optionally, the different cyclone filtration and dehydration equipment can be used for filtering and dehydrating slag water of different particle sizes.

[0020] Optionally, the feeding unit includes:

[0021] a buffer device, used for buffering and collecting the slag-water mixture generated by the granulation device;

[0022] The slurry pump station device includes one or more slurry pump groups, which are used to pressurize the slag-water mixture and transport it to the cyclone filtration and dehydration unit to achieve slag and water filtration and dehydration.

[0023] Optionally, the buffer device includes one or more storage spaces.

[0024] Optionally, the blast furnace slag filtering and dehydration system further includes:

[0025] The water circulation treatment unit is arranged between the water collecting device and the granulation unit, and is used to use the top flow water collected by the water collecting device as slag flushing circulation water, and transport it to the granulation unit after treatment to prepare a slag-water mixture.

[0026] Optionally, the water circulation treatment unit includes:

[0027] A water cooling device, connected to the water collecting device, for cooling the collected top flow water as slag flushing water;

[0028] A water suction well device, connected to the water cooling device, for collecting and storing cooled slag flushing water;

[0029] The slag flushing water pump station device is connected to the water suction well device and is used to pressurize the slag flushing water and pump it into the granulation device.

[0030] Optionally, the water circulation treatment unit further includes an upper tower pump station device, which is arranged between the water collection device and the water cooling device, and is used to pressurize the collected top flow water and transmit it to the water cooling device.

[0031] Optionally, the blast furnace slag filtering and dehydration system further includes:

[0032] a slag dehydration device for performing secondary dehydration on the collected underflow slag to reduce the water content of the underflow slag; and / or,

[0033] a transport device for transporting the underflow slag; and / or,

[0034] The slag storage device is used to store the underflow slag.

[0035] Optionally, the granulation unit includes:

[0036] A granulation device, used for granulating blast furnace slag;

[0037] The granulation tower device is connected to the granulation device and is used to mix the granulated blast furnace slag with slag flushing water to obtain a slag-water mixture.

[0038] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0039] The present application provides a cyclone filtration dehydration process and system for blast furnace slag, which includes: obtaining a slag-water mixture as an object to be separated; subjecting the slag-water mixture to cyclone filtration dehydration, utilizing the centrifugal force generated by fluid rotation to achieve solid-liquid two-phase filtration and dehydration of slag and water based on density or particle size differences, thereby obtaining top-flow water and bottom-flow slag; and collecting the top-flow water and the bottom-flow slag separately. This method uses the principle of cyclone filtration dehydration to achieve slag dehydration and particle size classification, replacing the physical interception filtration equipment in the prior art, effectively avoiding the problem of slag clogging the filter and requiring frequent cleaning or maintenance of the equipment; at the same time, the process provided in this method has no requirements for the water quality of the slag-water mixture, and has a wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] Figure 1 Schematic diagram of a process for filtering and dehydrating blast furnace slag according to some embodiments of the present application;

[0043] Figure 2 Schematic diagram of the principle of a blast furnace slag cyclone filtration and dehydration system according to some embodiments of the present application;

[0044] Figure 3 Schematic diagram of the structure of a blast furnace slag cyclone filtration and dehydration system according to some embodiments of the present application;

[0045] Figure 4 Schematic diagram of the structure of a cyclone filtration and dehydration device according to some embodiments of the present application;

[0046] 1 is blast furnace slag, 2 is granulation device, 3 is granulation tower device, 4 is buffer device, 5 is slurry pump station device, 5-N is the Nth slurry pump group, 6 is cyclone filtration dehydration unit, 6-N is the Nth group of cyclone filtration dehydrator group, 6-Ni is the i-th cyclone filtration dehydration equipment in the Nth group, 7 is slag discharge device, 8 is transportation device, 9 is slag storage device, 10 is water collection device, 11 is upper tower pump station device, 12 is water cooling device, 13 is water suction well device, 14 is slag flushing pump station device, 15-N is the top flow water discharged from the Nth group of cyclone filtration dehydrator group, and 16-N is the bottom flow slag discharged from the Nth group of cyclone filtration dehydrator group. DETAILED DESCRIPTION

[0047] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] The range descriptions described in this article, such as numerical ranges, ratio ranges, etc., include all possible sub-ranges and single numerical values ​​within the range. For example, the range description of "1 to 6" or "1~6" covers all sub-ranges from 1 to 6 (such as 1 to 3, 2 to 5, etc.) and single numbers (such as 1, 2, 3, 4, 5, 6). Unless otherwise specified, the terms "including", "comprising", etc. used in this article mean "including but not limited to"; relational terms such as "first" and "second" are only used to distinguish different entities or operations, and do not imply an actual sequence or association relationship; "and / or" means that multiple situations can exist alone or at the same time; expressions such as "at least one", "multiple", and "at least one" refer to any combination of corresponding objects, including a combination of single or multiple objects. The proportional relationships involved in the article, such as mass ratios, molar ratios, etc., should be understood as the corresponding relationship between the first and second terms of the proportional formula in the order of description. The raw materials, reagents, instruments and equipment used in this article can be purchased on the market or prepared by existing methods.

[0049] Figure 1 Schematic diagram of a process for cyclone filtration and dehydration of blast furnace slag according to some embodiments of the present application;

[0050] First, as Figure 1 As shown, the embodiment of the present application also provides a blast furnace slag filtering and dehydration method, comprising the following steps:

[0051] S1, obtaining a slag-water mixture;

[0052] The purpose of step S1 is to provide a slag-water mixture raw material for the subsequent separation process; the preparation method thereof can be to granulate and water-quench blast furnace slag to obtain the slag-water mixture.

[0053] S2, performing cyclone filtration and dehydration on the slag-water mixture to separate the slag and water to obtain top flow water and bottom flow slag;

[0054] Step S2 is the main step, in which the obtained blast furnace slag and water mixture is subjected to a cyclone filtration and dehydration process for the first time to achieve slag-water separation and obtain top flow water and bottom flow slag.

[0055] S3, collecting the top flow water and the bottom flow slag respectively;

[0056] The purpose of step S3 is to collect the water and slag obtained after cyclone filtration and dehydration. Since the water with lighter specific gravity is discharged from the top and the slag with heavier specific gravity is discharged from the bottom during cyclone, the top flow water and bottom flow slag are collected separately.

[0057] In the above embodiment, the slag-water mixture can first be prepared through a granulation unit, and then the slag-water mixture is input into a cyclone filtration and dehydration unit for separation. The slag and water are separated by centrifugal rotation to obtain top flow water and bottom flow slag; finally, a water collection device and a slag discharge device are used to collect the top flow water and the bottom flow slag respectively, and the collected top flow water and bottom flow slag can be further used.

[0058] As an optional embodiment, the step S2, inputting the slag-water mixture into a cyclone filtration dehydration process to obtain top flow water and bottom flow slag, specifically comprises:

[0059] The slag-water mixture is input into a cyclone filtration and dehydration unit to form a rotating fluid. The centrifugal force generated by the fluid rotation is used to achieve solid-liquid two-phase filtration and dehydration of the slag and water based on density or particle size differences to obtain top flow water and bottom flow slag.

[0060] In the above-mentioned embodiment, the principle of cyclonic filtration and dehydration of the slag-water mixture lies in the fact that differences in density or particle size create rotating fluids with varying centrifugal forces, thereby achieving solid-liquid two-phase filtration and dehydration of the slag and water. Based on this principle, different rotational forces can be set to separate slag of different particle sizes, achieving slag particle size classification.

[0061] As an optional embodiment, the method further comprises: recovering the top flow water for preparing the slag-water mixture.

[0062] In the above embodiment, the top flow water can be recycled through the water circulation treatment unit, thereby saving water resources and reducing costs.

[0063] As an optional implementation, between steps S1 and S2, the process further includes: pressurizing the slag-water mixture by using a feeding unit to obtain a pressurized slag-water mixture.

[0064] In the above embodiment, the slag-water mixture is pressurized in order to provide a certain initial velocity for the slag-water mixture to enter the cyclone filtration and dehydration unit, thereby achieving a better slag-water separation effect.

[0065] Figure 2 Schematic diagram of the principle of a blast furnace slag cyclone filtration and dehydration system according to some embodiments of the present application; Figure 3 This is a structural schematic diagram of a blast furnace slag cyclone filtration and dehydration system according to some embodiments of the present application.

[0066] like Figure 2 and Figure 3 As shown, in a second aspect, an embodiment of the present application provides a blast furnace slag cyclone filtration and dehydration system for implementing the blast furnace slag cyclone filtration and dehydration process described in the first aspect, the blast furnace slag cyclone filtration and dehydration system comprising:

[0067] A granulation unit for granulating and water-quenching blast furnace slag to prepare a slag-water mixture;

[0068] A feeding unit, used for collecting the slag-water mixture and pressurizing the slag-water mixture to supply it to a cyclone filtration and dehydration system;

[0069] A cyclone filtration and dehydration unit, comprising one or more cyclone filtration and dehydration devices, for separating the slag-water mixture into slag and water to obtain bottom flow slag and top flow water;

[0070] a water collecting device connected to the water outlet of the cyclone filtration and dehydration system and used for collecting the top flow water;

[0071] The slag discharge device is connected to the slag discharge port of the cyclone filtration and dehydration system and is used to collect the bottom flow slag.

[0072] In the above embodiment, the granulation unit includes equipment such as a granulation tower, which is used to granulate and quench the blast furnace slag, preparing a slag-water mixture for subsequent filtration and dehydration; the feeding unit includes equipment such as a pump station, which pressurizes the slag-water mixture and transmits it to the cyclone filtration and dehydration unit for filtration and dehydration. The cyclone filtration and dehydration unit is an important component of the system. The slag-water mixture enters the cyclone filtration and dehydration unit to form a rotating fluid. The centrifugal force generated by the fluid rotation is used to achieve different centrifugal forces between the slag and water solid-liquid phases based on density or particle size differences, thereby achieving water-slag dehydration and particle size classification. Compared with the physical interception equipment in the prior art, it can avoid waste slag clogging the equipment, is applicable to various water qualities, is low-cost and efficient, and finally the separated top flow water and bottom flow slag are collected respectively by the water collection device and the slag discharge device.

[0073] As an optional embodiment, the cyclone filtration and dehydration system includes N groups of cyclone filtration and dehydration device groups connected in parallel and / or in series, and each group of cyclone filtration and dehydration device groups includes i cyclone filtration and dehydration devices connected in parallel and / or in series, wherein the value of N is 1, 2, 3…, and the value of i is 1, 2, 3….

[0074] In the above embodiment, the cyclone filtration and dehydration unit includes at least one cyclone filtration and dehydration device group, each group including at least one cyclone filtration and dehydration device. If multiple cyclone filtration and dehydration devices are connected, they can be arranged in parallel or in series, or in both series and parallel, such as in a matrix configuration. Each cyclone filtration and dehydration device group includes at least one cyclone filtration and dehydration device. If multiple cyclone filtration and dehydration devices are connected, they can be arranged in series or in parallel, or in both series and parallel configurations.

[0075] Exemplarily, the value of N can be a positive integer such as 1, 2, 3, 4, 5, 6, etc., and the value of i can be a positive integer such as 1, 2, 3, 4, 5, 6, 7, etc.

[0076] As an optional embodiment, the different cyclone filtration and dehydration equipment can be used for slag-water separation of different particle sizes.

[0077] In the above embodiment, in order to better achieve slag water filtration, different cyclone filtration and dehydration equipment can be used for slag water filtration of different particle sizes, such as multiple cyclone filtration and dehydration equipment connected in series or multiple cyclone filtration and dehydration device groups, the bottom flow slag separated by the size decreases or increases in a step-by-step manner.

[0078] As an optional embodiment, the structural diagram of the cyclone filtration dehydration equipment is as follows Figure 4 Shown, including:

[0079] The main structure is used to contain the slag-water mixture and realize the centrifugal separation process;

[0080] A feed port, arranged above the main structure, for feeding the slag-water mixture;

[0081] A slag outlet is provided below the main structure and is used to discharge heavy bottom slag;

[0082] The water outlet is arranged on the top of the main structure and is used to discharge top flow water with low specific gravity.

[0083] As an optional embodiment, the cyclone filtration and dehydration unit includes a first cyclone filtration and dehydration device group, a second cyclone filtration and dehydration device group and a third cyclone filtration and dehydration device group connected in parallel, wherein each group of cyclone filtration and dehydration devices includes a first cyclone filtration and dehydration device, a second cyclone filtration and dehydration device and a third cyclone filtration and dehydration device connected in series; wherein the feed port of the first cyclone filtration and dehydration device is connected to the feeding device, the slag outlet of the first cyclone filtration and dehydration device is connected to the feed port of the second cyclone filtration and dehydration device, the slag outlet of the second cyclone filtration and dehydration device is connected to the feed port of the third cyclone filtration and dehydration device, the slag outlet of the third cyclone filtration and dehydration device is connected to the slag discharge device, and the water outlets of all cyclone filtration and dehydration devices are connected to the water collection device.

[0084] As an optional embodiment, a slurry pump group or a booster device can be set between the slag outlet of the first cyclone filtration and dehydration equipment and the feed inlet of the second cyclone filtration and dehydration equipment, and between the slag outlet of the second cyclone filtration and dehydration equipment and the feed inlet of the third cyclone filtration and dehydration equipment to increase the initial velocity entering the equipment.

[0085] As an optional embodiment, the feeding unit includes:

[0086] a buffer device for buffering and collecting the slag-water mixture generated by the granulation unit;

[0087] The slurry pump station device includes one or more slurry pump groups, which are used to pressurize the slag-water mixture and transport it to the cyclone filtration dehydration unit to separate the slag and water.

[0088] In the above embodiment, the buffer device can collect and store the slag-water mixture generated by the granulation unit to ensure sufficient supply; the slurry pump station device is used to pressurize the slag-water mixture so that it has a certain pressure when entering the cyclone filtration dehydration unit, thereby achieving a better separation effect.

[0089] As an optional embodiment, the slurry pumping station device includes one or more slurry pump groups, and each slurry pump group can be used to supply material to one or more cyclone filtration and dewatering equipment.

[0090] In the above embodiment, the power of one slurry pump group is not enough to feed all the cyclone filtration dewatering equipment, so the number of slurry pump groups and the corresponding feeding objects can be adjusted according to actual needs to achieve efficient feeding.

[0091] As an optional embodiment, the buffer device includes one or more storage spaces, and each storage space is correspondingly provided with one or more slurry pump groups.

[0092] In the above embodiment, a plurality of storage spaces are provided in the buffer device, and the generated slag-water mixture can be divided into different spaces, and then transported to the cyclone filtration and dehydration equipment by using the corresponding slurry pump group.

[0093] As an optional embodiment, the blast furnace slag filtering and dehydration system further includes:

[0094] The water circulation treatment unit is arranged between the water collecting device and the granulation unit, and is used to use the top flow water collected by the water collecting device as slag flushing circulation water, and transport it to the granulation unit after treatment to prepare a slag-water mixture.

[0095] In the above embodiment, the water circulation treatment unit can recycle the water discharged from the cyclone filtration and dehydration equipment for recycling, thereby saving resources and reducing the pressure of sewage discharge.

[0096] As an optional embodiment, the water circulation treatment unit includes:

[0097] A water cooling device, connected to the water collecting device, for cooling the collected top flow water as slag flushing water;

[0098] A water suction well device, connected to the water cooling device, for collecting and storing cooled slag flushing water;

[0099] The slag flushing water pump station device is respectively connected to the water suction well device and the granulation unit, and is used to pressurize the slag flushing water in the water suction well device and pump it into the granulation unit to re-prepare the slag-water mixture.

[0100] As an optional embodiment, the water circulation treatment unit further includes an upper tower pump station device, which is arranged between the water collection device and the water cooling device, and is used to pressurize the collected top flow water and transmit it to the water cooling device.

[0101] In the above embodiment, if there is a height difference or a long distance between the water collecting device and the water cooling device, an upper tower pump station device can be used to pressurize the top flow water and transmit it to the water cooling device.

[0102] As an optional embodiment, the slag discharge device includes:

[0103] a slag dehydration device for performing secondary dehydration on the collected underflow slag to reduce the water content of the underflow slag; and / or,

[0104] a transport device for transporting the underflow slag; and / or,

[0105] The slag storage device is used to store the underflow slag.

[0106] In the above embodiment, since the underflow slag may still contain some water, a dehydration device can be used to perform secondary dehydration, such as filter press dehydration or cyclone filtration dehydration. The transport device can be a belt conveyor or a truck, and the slag storage device can be a bottom filter tank, a water sump, a sedimentation tank, etc.

[0107] As an optional embodiment, the granulation unit includes:

[0108] A granulation device, used for granulating blast furnace slag;

[0109] The granulation tower device is connected to the granulation device and is used to mix the granulated blast furnace slag with slag flushing water to obtain a slag-water mixture.

[0110] The blast furnace slag filtration and dehydration system is used to realize the above-mentioned blast furnace slag filtration and dehydration process. The specific usage steps of the filtration and dehydration system can refer to the above-mentioned embodiments. Since the filtration and dehydration method adopts part or all of the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0111] The present application is further described below with reference to specific examples. Experimental methods in the following examples where specific conditions are not specified are generally measured in accordance with national / industry standards. If there are no corresponding national / industry standards, the methods are carried out in accordance with commonly used international standards, conventional conditions, or conditions recommended by the manufacturer.

[0112] Examples 1 to 6 respectively provide blast furnace slag filtration and dehydration processes using blast furnace slag cyclone filtration and dehydration systems with different configurations, with specific parameters and performance details as follows.

[0113] Example 1

[0114] This embodiment provides a blast furnace slag filtration and dehydration process, which is implemented using a blast furnace slag filtration and dehydration system, wherein the blast furnace slag filtration and dehydration system is as follows: Figure 3 As shown, it includes: a granulation device, a granulation tower device, a buffer device, a slurry pump station device and a cyclone filtration dehydration unit connected in sequence, a water collecting device is set on the top of the cyclone filtration dehydrator, and a slag discharge device is set at the bottom. An upper tower pump station device, a water cooling device, a water suction well device and a slag flushing pump station device are also arranged in sequence between the water collecting device and the granulation device. The slag discharge device includes a transportation device and a slag discharge storage device.

[0115] When the system is running, the principles are as follows:

[0116] First, the blast furnace slag flows through the granulation unit and granulation tower unit through the slag ditch, completing granulation and water quenching to form a slag-water mixture. The slag-water mixture enters the buffer unit for storage. At least one slurry pump unit is installed at the buffer unit outlet. The slag-water mixture is pressurized by the slurry pump unit and enters the cyclone filtration and dehydration unit. The slag-water mixture passes through the cyclone filtration and dehydration unit to achieve slag-water separation. The top flow water is discharged from the upper part of the cyclone filtration and dehydration unit, and the bottom flow slag is discharged from the lower part. After the bottom flow slag enters the slag discharge unit, it can be further dehydrated in the slag discharge unit and then transported to the slag storage unit for storage. The top flow water is recycled as slag flushing water. It first enters the water collection unit, then is pressurized by the upper tower pump unit and enters the water cooling unit for cooling. The cooled slag flushing water enters the water suction well unit. From the water suction well unit, the slag flushing water is pressurized by the slag flushing pump station unit and enters the granulation unit for recycling to produce slag.

[0117] The cyclone filter dehydration unit in this embodiment adopts a single-group single-stage mode, that is, it includes a cyclone filter dehydrator group, which includes i cyclone filter dehydration devices connected in parallel, and the value of i can be 4, 5, or 6. The processing capacity of a single unit is 5m 3 / h~500m 3 / h, the more parallel connections, the greater the processing capacity, the processing capacity of a single group is 5m 3 / h~500xim 3 / h.

[0118] The blast furnace slag filtering and dehydration process comprises the following steps:

[0119] A granulation device and a granulation tower device are used to mix blast furnace slag with water to prepare a slag-water mixture;

[0120] The slag-water mixture is stored in a buffer device, pressurized by a slurry pumping station device, and input into a cyclone filtration dehydration unit for slag-water separation to obtain top flow water and bottom flow slag;

[0121] A water collecting device and a slag discharging device are respectively used to collect the top flow water and the bottom flow slag;

[0122] The upper tower pump station device is used to pressurize the top flow water collected in the water collection device and input it into the water cooling device for cooling, and then discharge it into the water absorption well device for storage; the slag flushing water stored in the water absorption well device can be input into the granulation device using the slag flushing pump station device to prepare a slag-water mixture.

[0123] Example 2

[0124] The only difference between this embodiment and embodiment 1 is that the cyclone filtration and dehydration unit in the blast furnace slag filtration and dehydration system adopts a multi-group multi-stage mode, that is, it includes three parallel cyclone filtration and dehydration groups, and each cyclone filtration and dehydration group includes three parallel cyclone filtration and dehydration devices. Single unit processing capacity 5m 3 / h~500m 3 / h, the more parallel connections, the greater the processing capacity, the processing capacity of a single group is 3*5m 3 / h~500m 3 / h, the overall processing capacity is 3*3*5m 3 / h~500m 3 / h.

[0125] Example 3

[0126] The only difference between this embodiment and Example 1 is that the cyclone filtration and dehydration unit in the blast furnace slag filtration and dehydration system adopts a multi-group, multi-stage mode, namely, it includes three parallel cyclone filtration and dehydration groups, each of which includes three parallel cyclone filtration and dehydration devices. Each cyclone filtration and dehydration device can be set to achieve a separation effect of different particle sizes.

[0127] Example 4

[0128] The only difference between this embodiment and embodiment 2 is that the blast furnace slag filtration and dehydration system in embodiment 2 adopts one slurry pump group device, while this embodiment adopts three slurry pump group devices, each slurry pump group device corresponds to a cyclone filter dehydrator group.

[0129] Example 5

[0130] The only difference between this embodiment and embodiment 1 is that the cyclone filtration and dehydration unit in the blast furnace slag filtration and dehydration system is arranged at an elevation above the water cooling device, and no upper tower pump station device is provided, and the top flow water can flow into the water cooling device by its own weight.

[0131] Example 6

[0132] The only difference between this embodiment and embodiment 1 is that the slag discharge device in the blast furnace slag filtration and dehydration system also includes a secondary dehydration slag discharge and dehydration device, which performs secondary dehydration on the collected underflow slag to reduce the water content of the underflow slag.

[0133] The foregoing is merely a detailed description of the present invention, intended to enable those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but rather is intended to conform to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A blast furnace slag filtration and dehydration process, characterized in that: The following steps are involved: Obtaining a slag-water mixture; The slag-water mixture is subjected to cyclone filtration and dehydration to separate the slag and water to obtain top-flow water and bottom-flow slag; The top flow water and the bottom flow slag are collected separately.

2. The blast furnace slag filtration and dehydration process according to claim 1, characterized in that: The slag-water mixture is subjected to cyclone filtration and dehydration to separate the slag and water to obtain top flow water and bottom flow slag, specifically comprising: The slag-water mixture is input into a cyclone filtration and dehydration unit to form a rotating fluid. The centrifugal force generated by the fluid rotation is used to achieve solid-liquid two-phase filtration and dehydration of the slag and water based on density or particle size differences to obtain top flow water and bottom flow slag.

3. A blast furnace slag filtration and dehydration system, used to implement the blast furnace slag filtration and dehydration process according to claim 1 or 2, characterized in that: The blast furnace slag filtering and dehydration system comprises: a granulation unit for granulating and water-quenching blast furnace slag to prepare the slag-water mixture; A feeding unit, used for collecting the slag-water mixture and pressurizing the slag-water mixture to supply it to a cyclone filtration and dehydration unit; A cyclone filtration and dehydration unit, comprising one or more cyclone filtration and dehydration devices, for performing solid-liquid separation, filtration and dehydration on the slag-water mixture to obtain bottom flow slag and top flow water; a water collecting device connected to the water outlet of the cyclone filtration and dehydration system and used for collecting the top flow water; The slag discharge device is connected to the slag discharge port of the cyclone filtration and dehydration system and is used to collect the bottom flow slag.

4. The blast furnace slag filtering and dehydration system according to claim 3, characterized in that: The cyclone filtration and dehydration system includes N groups of cyclone filtration and dehydration devices connected in parallel and / or in series, and each group of cyclone filtration and dehydration devices includes i cyclone filtration and dehydration devices connected in parallel and / or in series, wherein the value of N is 1, 2, 3..., and the value of i is 1, 2, 3...

5. The blast furnace slag filtering and dehydration system according to claim 3, characterized in that: The different cyclone filtration and dehydration equipment can be used for separation of slag and water with different particle sizes.

6. The blast furnace slag filtering and dehydration system according to claim 3, characterized in that: The feeding unit comprises: a buffer device, used for buffering and collecting the slag-water mixture generated by the granulation device; A slurry pumping station device, comprising one or more slurry pump groups, for pressurizing the slag-water mixture and conveying it to the cyclone filtration and dehydration unit to achieve slag-water separation; and / or, The buffer device includes one or more storage spaces.

7. The blast furnace slag filtering and dehydration system according to claim 3, characterized in that: The blast furnace slag filtering and dehydration system also includes: The water circulation treatment unit is arranged between the water collecting device and the granulation unit, and is used to use the top flow water collected by the water collecting device as slag flushing circulation water, and transport it to the granulation unit after treatment to prepare the slag-water mixture.

8. The blast furnace slag filtering and dehydration system according to claim 7, characterized in that: The water circulation treatment unit comprises: A water cooling device, connected to the water collecting device, for cooling the collected top flow water as slag flushing water; A water suction well device, connected to the water cooling device, for collecting and storing the cooled slag flushing water; The slag flushing water pump station device is connected to the water suction well device and is used to pressurize the slag flushing water and pump it into the granulation device.

9. The blast furnace slag filtering and dehydration system according to claim 7 or 8, characterized in that: The water circulation treatment unit also includes an upper tower pump station device, which is arranged between the water collecting device and the water cooling device and is used to pressurize the collected top flow water and transmit it to the water cooling device.

10. The blast furnace slag filtering and dehydration system according to claim 3, characterized in that: The blast furnace slag filtering and dehydration system also includes: a slag discharge and dehydration device, used for performing secondary dehydration on the underflow slag collected in the slag discharge device to reduce the water content of the underflow slag; and / or, a transport device for transporting the underflow slag; and / or, The slag storage device is used to store the underflow slag.

Images