Production method of demineralized water for ironmaking production

Abstract

The invention discloses a production method of desalted water for ironmaking production. A raw water inlet pipe of a reservoir is communicated with a water inlet pipeline of each filter; the ultrafiltration processors are connected in series; a water outlet of each filter is communicated with a water inlet pipeline of the first-stage ultrafiltration treater; a water outlet of the N-stage ultrafiltration treater is communicated with a water inlet pipeline of the filtered water storage tank; a water outlet of the filtered water storage tank is communicated with a water inlet pipeline of the primary reverse osmosis processor; all stages of reverse osmosis processors are connected in series, and water outlets of the N stages of reverse osmosis processors are communicated with a demineralized water storage tank pipeline. According to the device, the content of various pollutants in water entering the ultrafilter can be reduced, a filter element for ultrafiltration and reverse osmosis can be protected, the content of various impurity ions in the water after ultrafiltration is reduced, the conductivity of produced water is about 10 us / cm, the hardness is 0.01 mol / L or below, the produced water is used for supplementing water for a steelmaking and steel rolling heating furnace, and generated steam can be used for power generation of a steam turbine. Water consumption is reduced, resources are saved, and the accumulation speed of scale in the boiler is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of ironmaking production, and in particular to a method for producing desalted water for ironmaking production. Background Art

[0002] Pure water is required in almost every process of steel production. It can be used to cool equipment to prevent equipment from shutting down due to overheating; to cool products; to cool by-products; and to produce steam for power generation. With the characteristics of large consumption and uninterrupted supply, the purity requirements of water in each process are not exactly the same. In order to increase the service life of the equipment and reduce blockage or slagging in the cooling and heat exchange tubes, the cooling water of the equipment is softened water. The cooling and heat exchange devices attached to some equipment have higher requirements for water quality and need to use demineralized water. Among them, the consumption of industrial circulating water accounts for about 49% of the total water consumption; the consumption of demineralized water accounts for about 21% of the total water consumption; and the consumption of softened water accounts for about 30% of the total water consumption.

[0003] The hardness of softened water should be less than 0.03mmol / L. The hardness mainly reflects the calcium (Ca 2+ ), magnesium (Mg 2+ ) ion concentration. When raw water with high hardness passes through the resin layer of the exchanger, calcium and magnesium ions in the water are adsorbed by the resin and sodium ions are released at the same time. However, when the resin is saturated with calcium and magnesium ions, the hardness of the outlet water increases. At this time, the water softener will automatically regenerate the failed resin according to the predetermined program. A high concentration of sodium chloride solution (brine) is passed into the resin to restore the failed resin to the sodium type resin and continue water treatment to obtain softened water.

[0004] The production process of softened water consumes a large amount of industrial salt. Each cubic meter of softened water consumes industrial salt and produces a large amount of wastewater with high chloride ion content. After neutralization, the reuse effect of such wastewater is poor. Excessive chloride ion content will cause the by-products produced by reuse to be unable to be exported, resulting in waste accumulation. Excessive chloride ion content in wastewater will also increase the difficulty of wastewater treatment and increase the amount of treatment agents used. This will lead to excessively high softened water production costs.

[0005] Moreover, as surface water is seriously polluted, groundwater often needs to be exploited. Groundwater has the problem of high hardness, which means that such water needs to be softened before being put into production. In addition, the hardness of raw water is relatively high, which further increases the use of industrial salt and the discharge of high-sodium wastewater.

[0006] Demineralized water refers to the finished water obtained by removing suspended matter, colloids, inorganic cations, anions and other impurities in water through the ultrafiltration reverse osmosis process. However, demineralized water has high requirements on the purity of the incoming water, and the existing water treatment equipment cannot meet the inlet requirements of the ultrafiltration reverse osmosis processor. Softened water is often used as the raw water for preparing demineralized water, but this leads to the inability to reduce the consumption of industrial salt in the softened water production link under large-scale industrial production, and the wastewater cannot be effectively treated, which increases the production cost of the enterprise. At the same time, the existing demineralized water production equipment has poor water supply stability, which affects the normal orderly production of various links in steelmaking.

[0007] The information disclosed in the background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0008] In view of the above technical problems, the present application provides a method for producing demineralized water for ironmaking production, which can produce demineralized water with a sodium content that meets the requirements and a stable and continuous water output.

[0009] The present application provides a method for producing demineralized water for ironmaking production, comprising: a multi-stage filter, at least two-stage ultrafiltration processors, and a multi-stage reverse osmosis processor;

[0010] The raw water inlet pipe of the reservoir is connected with the water inlet pipes of each filter; the ultrafiltration processors of each level are connected in series;

[0011] The water outlet of each filter is respectively connected to the water inlet pipeline of the first-stage ultrafiltration processor;

[0012] The water outlet of the N-level ultrafiltration processor is connected to the water inlet pipeline of the filtered water storage tank;

[0013] The water outlet of the filtered water storage tank is connected to the water inlet pipeline of the first-stage reverse osmosis processor; the reverse osmosis processors of each stage are connected in series, and the water outlet of the N-stage reverse osmosis processor is connected to the desalted water storage tank pipeline;

[0014] The inflow rate of the treated reservoir raw water is 180~220m 3 / h, hardness is 1.5mmol / L; turbidity is 15-20NTU;

[0015] The turbidity of raw water is below 5NTU after being treated by multi-stage filters;

[0016] The water flow rate of the ultrafiltration processor used is 0.2 to 0.7 tons / hour;

[0017] The conductivity of the effluent from the reverse osmosis processor is 2.1 to 25.0 μS / cm;

[0018] The water flow rate of the reverse osmosis processor is 0.1 to 0.3 tons / hour;

[0019] The conductivity of the obtained desalted water is 8-11 us / cm, and the hardness is below 0.01 mol / L.

[0020] Preferably, the filter comprises: a tank body, a first filter material layer, a second filter material layer, a third filter material layer, a fourth filter material layer, a filter plate, a water inlet, and a water outlet;

[0021] A filter plate is arranged at the lower part of the tank body; a first filter material layer, a second filter material layer, a third filter material layer, and a fourth filter material layer are stacked on the filter plate in order from top to bottom;

[0022] The water inlet is arranged directly opposite to the tank cavity above the fourth filter material layer; the water outlet is arranged directly opposite to the tank cavity below the first filter material layer;

[0023] The first filter material layer 241 is filled with quartz sand medium with a particle size of 100-200 meshes, the second filter material layer 242 is filled with quartz sand medium with a particle size of 8 mm; the third filter material layer 243 is filled with quartz sand medium with a particle size of 15 mm; the fourth filter material layer 244 is filled with quartz sand medium with a particle size of 20 mm.

[0024] Preferably, the filter comprises: an inlet pipe, a discharge pipe, a filter inlet valve, and a filter discharge valve; the inlet pipe and the discharge pipe are respectively connected to the water inlet of the filter; the filter inlet valve is arranged on the inlet pipe; and the filter discharge valve is arranged on the discharge pipe.

[0025] Preferably, the filter comprises: an inlet pipe, an outlet pipe, a filter inlet valve, and a filter outlet valve; the inlet pipe and the outlet pipe are respectively connected to the outlet pipeline; the filter inlet valve is arranged on the inlet pipe; and the filter outlet valve is arranged on the outlet pipe.

[0026] Preferably, the filter comprises: a vent pipe and a filter vent valve; the vent pipe is connected to the water outlet pipeline; and the filter vent valve is arranged on the vent pipe.

[0027] Preferably, the filter comprises: a sewage pipe; a vent pipe and a backflow pipe respectively connected to the sewage pipe.

[0028] Preferably, the ultrafiltration processor comprises: a second ultrafiltration processor and a first ultrafiltration processor; the water inlet of the first ultrafiltration processor is connected to the filter pipeline; the water outlet of the first ultrafiltration processor is connected to the water inlet pipeline of the second ultrafiltration processor; the water outlet of the second ultrafiltration processor is connected to the water inlet pipeline of the filtered water storage tank;

[0029] The water flow rate of the first ultrafiltration processor is 0.2 tons / hour;

[0030] The water outlet flow rate of the second ultrafiltration processor is 0.7 tons / hour.

[0031] Preferably, the reverse osmosis processor comprises: a first reverse osmosis processor and a second reverse osmosis processor; the water inlet of the first reverse osmosis processor is connected to the water outlet pipeline of the filtered water storage tank; the water outlet of the first reverse osmosis processor is connected to the water inlet pipeline of the second reverse osmosis processor; the water outlet of the second reverse osmosis processor is connected to the water inlet pipeline of the desalted water storage tank;

[0032] The effluent conductivity of the first reverse osmosis processor is 25.0 μS / cm, and the effluent flow rate is 0.1 ton / hour;

[0033] The effluent conductivity of the second reverse osmosis processor is 2.1 μS / cm, and the effluent flow rate is 0.3 tons / hour.

[0034] Preferably, it comprises: a plurality of pumps and a plurality of valves; the pumps and valves are arranged at intervals on the raw water inlet pipe of the reservoir;

[0035] Pumps and valves are arranged at intervals on the pipelines connecting the filter and the ultrafiltration processor;

[0036] Pumps and valves are arranged at intervals on the pipeline connecting the filtered water storage tank and the reverse osmosis processor.

[0037] Preferably, it includes: a plurality of drain valves; drain valves are arranged on the drain pipelines of the ultrafiltration processor and the reverse osmosis processor.

[0038] The beneficial effects of this application include:

[0039] 1) The method for producing desalted water for ironmaking provided in the present application can directly obtain desalted water after using reservoir water as raw water through a filter, an ultrafiltration processor, and a reverse osmosis processor. There is no need to use softened water as raw water, which reduces the amount of industrial salt used, and the water output is stable, which can meet the production needs of all links in ironmaking.

[0040] 2) The method for producing demineralized water for ironmaking provided in this application is used to treat the inlet flow rate of reservoir water of 180 to 220 m 3 / h, the hardness of the inlet water is 1.5mmol / L; the turbidity is 15-20NTU; the conductivity of the desalted water obtained after treatment is 8-11us / cm, and the hardness is below 0.01mol / L. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of equipment used in a method for producing desalted water for ironmaking production in at least one embodiment provided in the present application;

[0042] Figure 2 A schematic front cross-sectional view of a filter in at least one embodiment provided in the present application;

[0043] Figure 3A schematic diagram of the demineralized water production line at each meter reading obtained by continuous monitoring for 2 months using the method used in Comparative Example 1 provided in this application;

[0044] Figure 4 A schematic diagram of the desalted water production line at each meter reading obtained by continuous monitoring for 2 months using the method used in Comparative Example 1 provided in this application;

[0045] Figure 5 This is a line diagram showing the number of bags of salt used corresponding to the number of salt-adding days for industrial salt using the method used in Comparative Example 1 provided in this application for two consecutive months; the weight of each bag of industrial salt is 50.

[0046] Legend:

[0047] Pump 211, valve 212, drain valve 121, first filter 21, second filter 22, third filter 23, water inlet 221, water outlet 224, filter inlet valve 222, filter back valve 223, filter back valve 225, filter outlet valve 226, filter vent valve 227, drain pipe 231, tank body 2, inspection port 234, first filter material layer 241, second filter material layer 242, third filter material layer 243, fourth filter material layer 244, filter plate 233, filtered water storage tank 1, second ultrafiltration processor 12, first ultrafiltration processor 11, first reverse osmosis processor 31, second reverse osmosis processor 32, desalted water storage tank 3. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in the field, and can be implemented in a variety of common knowledge settings.

[0051] See also Figures 1 to 3 The present application provides a method for producing demineralized water for ironmaking production, wherein the raw water treated by the method has an inlet flow rate of 180 to 220 m3 / h, hardness is 1.5mmol / L; turbidity is 15-20NTU;

[0052] After the raw water is filtered through the filter, the turbidity is below 5NTU, meeting the requirements of the subsequent ultrafiltration processor.

[0053] The outlet water flow rate of the ultrafiltration processor used is 0.2-0.7 tons / hour; the outlet water conductivity of the reverse osmosis processor is 2.1-25.0μS / cm, and the outlet water flow rate of the reverse osmosis processor is 0.1-0.3 tons / hour; water treatment according to this parameter setting can ensure that the conductivity of the obtained desalted water is 8-11us / cm and the hardness is below 0.01mol / L.

[0054] The equipment used includes: a plurality of pumps 211, a plurality of valves 212, a plurality of drain valves 121, a first filter 21, a second filter 22, a third filter 23, a water inlet 221, a water outlet 224, a filter inlet valve 222, a filter backflow valve 223, a filter backflow valve 225, a filter outlet valve 226, a filter vent valve 227, a drain pipe 231, a tank body 2, an inspection port 234, a first filter material layer 241, a second filter material layer 242, a filter plate 233, a filtered water storage tank 1, a second ultrafiltration processor 12, a first ultrafiltration processor 11, a first reverse osmosis processor 31, a second reverse osmosis processor 32, and a desalted water storage tank 3;

[0055] The water inlets 221 of the first filter 21, the second filter 22 and the third filter 23 are respectively connected to the reservoir water inlet pipe for treating the raw water outflow from the reservoir; a raw water inlet pump is arranged on the reservoir water inlet pipe, and the frequency of the raw water inlet pump used is 0.38HZ. The use of this pump can meet the water demand of each process required for the production of the iron and steel plant.

[0056] After the reservoir raw water is processed by any one of the first filter 21, the second filter 22 or the third filter 23, it is connected to the first ultrafiltration processor 11 through a pipeline for primary ultrafiltration treatment, and then enters the second ultrafiltration processor 12 through the inlet of the second ultrafiltration processor 12 connected to the outlet pipeline of the first ultrafiltration processor 11 for secondary ultrafiltration treatment. The treated water can be cached in the filtered water storage tank 1. According to the combing capacity and situation of the subsequent process section, the water is passed into the super osmosis processor for treatment. The reverse osmosis processor used includes: a first reverse osmosis processor 31 and a second reverse osmosis processor 32; the water inlet of the first reverse osmosis processor 31 is connected to the water outlet pipeline of the filtered water storage tank 1; the water outlet of the first reverse osmosis processor 31 is connected to the water inlet pipeline of the second reverse osmosis processor 32; the water outlet of the second reverse osmosis processor 32 is connected to the water inlet pipeline of the desalted water storage tank 3; the water conductivity of the first reverse osmosis processor 31 is 25.0μS / cm, and the water flow rate is 0.1 tons / hour; the water conductivity of the second reverse osmosis processor 32 is 2.1μS / cm, and the water flow rate is 0.3 tons / hour. Reverse osmosis treatment according to this flow rate can ensure the stability of the desalted water flow rate.

[0057] The reverse osmosis processor and ultrafiltration processor used in this application are commercially available products and are configured in the manner of commercially available products.

[0058] In a specific embodiment, the filter used includes: a tank body 2, an inspection port 234, a first filter material layer 241, a second filter material layer 242, a third filter material layer 243, a fourth filter material layer 244, and a filter plate 233; a filter plate 233 is arranged at the lower part of the tank body 2; the filter plate 233 is fixedly arranged in the tank body 2, and a second filter material layer 242 is arranged on the filter plate 233; a first filter material layer 241 is arranged on the second filter material layer 242; a third filter material layer 243 is arranged on the second filter material layer 242; a fourth filter material layer 244 is arranged on the third filter material layer 243;

[0059] A space is reserved between the tank body 2 and the fourth filter material layer 244 for buffering the water to be treated entering the tank body 2. Under the action of water pressure, the water to be treated sequentially passes through the first filter material layer 241, the second filter material layer 242, the third filter material layer 243, and the fourth filter material layer 244 and enters the space between the lower part of the first filter material layer 241 and the tank body 2; a filter membrane capable of preventing the first filter material layer 241 from leaking is provided on the filter plate 233, and the specific pore size of the membrane is smaller than the particle size of the filling material of the first filter material layer 241.

[0060] In a specific embodiment, the third filter material layer 243 and the fourth filter material layer 244 are filled with loose coarse sand media to form a loose area; the first filter material layer 241 and the second filter material layer 242 are filled with dense fine sand media to form a dense area; thereby achieving active contact and coagulation of suspended matter contained in the raw water in the loose area through flow contact, thereby effectively removing the suspended matter; this area intercepts larger particles of suspended matter;

[0061] In the compact area, inertial collision and adsorption between suspended particles are mainly used to intercept smaller suspended particles in the raw water. The biological interception ability of the medium can effectively remove large particles, colloids, suspended matter, etc. in the water.

[0062] The first filter material layer 241 is filled with quartz sand medium with a particle size of 100-200 meshes, the second filter material layer 242 is filled with quartz sand medium with a particle size of 8 mm; the third filter material layer 243 is filled with quartz sand medium with a particle size of 15 mm; the fourth filter material layer 244 is filled with quartz sand medium with a particle size of 20 mm.

[0063] In a specific embodiment, the filter includes: a water inlet 221 and a water outlet 224; the water inlet 221 is arranged opposite to the cavity of the tank body 2 at the upper part of the first filter material layer 241; the water outlet 224 is arranged opposite to the cavity surrounded by the lower part of the filter plate 233 and the tank body 2. After the water to be treated enters from the water inlet 221, it is filtered by each filter material and then flows out from the cavity at the lower part of the tank body 2. Multiple layers of filter material can be arranged in the filter.

[0064] In a specific embodiment, the filter material particle size of the first filter material layer 241 is larger than the filter material particle size filled in the second filter material layer 242, so as to avoid clogging of the first filter material layer 241. An opening is provided on the top of the tank body 2, and a cover body is provided on the opening to facilitate replacement of the filter material in the tank body 2.

[0065] In a specific embodiment, a water inlet pipe and a backflow pipe are connected to the water inlet 221 respectively; a filter water inlet valve 222 and a filter backflow valve 223 are respectively provided on the water inlet pipe and the backflow pipe.

[0066] In a specific embodiment, the water outlet 224 is connected to a reverse inlet pipe, a water outlet pipe, and a vent pipe respectively; a filter reverse inlet valve 225 is provided on the reverse inlet pipe; a filter water outlet valve 226 is provided on the water outlet pipe; and a filter vent valve 227 is provided on the vent pipe.

[0067] In a specific embodiment, it includes: a sewage pipe 231; and the extended ends of the backwash pipe and the vent pipe are connected to the sewage pipe 231. According to this arrangement, the filter can be backwashed and cleaned regularly to maintain the filtering effect of the filter.

[0068] In a specific embodiment, it includes: at least two stages of ultrafiltration processors; the water outlets of each filter are respectively connected to the water inlet pipeline of the first-stage ultrafiltration processor; the water outlet of the first-stage ultrafiltration processor is connected to the water inlet pipeline of the second-stage ultrafiltration processor; the pipelines from the second-stage ultrafiltration processor to the N-stage ultrafiltration processor are connected in series; for example, the filter includes: a first filter 21, a second filter 22, and a third filter 23; the water inlets of the first filter 21, the second filter 22, and the third filter 23 are respectively connected to the water inlet pipe of the reservoir; the water outlets of the first filter 21, the second filter 22, and the third filter 23 are respectively connected to the water inlet pipeline of the ultrafiltration processor; by arranging the first filter 21, the second filter 22, and the third filter 23, adverse effects on the water filtration process can be avoided during any backwash cleaning.

[0069] In a specific embodiment, the ultrafiltration processor includes: a second ultrafiltration processor 12, a first ultrafiltration processor 11; the water outlet of the filter is connected to the water inlet pipeline of the first ultrafiltration processor 11, and a pump 211 is arranged on the connecting pipeline; the water outlet of the first ultrafiltration processor 11 is connected to the water inlet pipeline of the second ultrafiltration processor 12. ; The water outlet flow rate of the first ultrafiltration processor 11 is 0.2 tons / hour; the water outlet flow rate of the second ultrafiltration processor 12 is 0.7 tons / hour.

[0070] In a specific embodiment, the second ultrafiltration processor 12 and the first ultrafiltration processor 11 include: a sewage pipeline, and a sewage valve 121 is respectively arranged on the sewage pipeline.

[0071] In a specific embodiment, the water outlet of the second ultrafiltration processor 12 is connected to the water inlet pipeline of the filtered water storage tank 1; a pump 211 is provided on the connecting pipeline and is turned on as needed.

[0072] In a specific embodiment, it includes: a first reverse osmosis processor 31 and a second reverse osmosis processor 32; the water outlet of the filtered water storage tank 1 is connected to the water inlet pipelines of the first reverse osmosis processor 31 and the second reverse osmosis processor 32 respectively, and the connected pipelines are provided with pumps 211 and valves 212 at intervals. The water outlets of the first reverse osmosis processor 31 and the second reverse osmosis processor 32 are connected to the desalted water storage tank 3 respectively. The conductivity of the outlet water of the first reverse osmosis processor (31) is 25.0μS / cm, and the outlet water flow rate is 0.1 tons / hour; the conductivity of the outlet water of the second reverse osmosis processor (32) is 2.1μS / cm, and the outlet water flow rate is 0.3 tons / hour.

[0073] In a specific embodiment, a sewage valve 121 is respectively provided on the sewage pipelines of the first reverse osmosis processor 31 and the second reverse osmosis processor 32 to control sewage discharge.

[0074] After the device was used in Xianfu Steel, it effectively improved the water use stability of each workshop, the stability of quality compliance, the amount of wastewater recycling, and work efficiency, stabilized the water supply reliability, and saved the cost of production of the entire group company.

[0075] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited in any way. Any changes or improvements made based on the teachings of the present invention fall within the protection scope of the present invention.

[0076] Example

[0077] Unless otherwise specified, the materials and instruments used in the following examples were obtained from commercial channels; the detection methods used were all existing methods unless otherwise specified.

[0078] Example 1

[0079] The above device uses reservoir water as raw water, and the water flow rate of the reservoir water used is 180~220m 3 / h, the hardness of the inlet water is 1.5mmol / L; the turbidity is 15-20NTU;

[0080] The conductivity of the desalted water obtained after treatment is 8-11 us / cm, the hardness is below 0.01 mol / L, and the output of the desalted water is stable at 100-150 tons / 1h.

[0081] Comparative Example 1

[0082] The difference from Example 1 is that the first to third filters are not used, but the obtained softened water is passed into an ultrafiltration processor.

[0083] The results of meter readings during the two-month production process show that when demineralized water is produced using the method in Comparative Example 1, the softened water output is as follows: Figure 3 As shown in the figure, it can be seen that the output of softened water is interrupted and cannot meet the production needs of demineralized water. The water output of demineralized water produced by the method provided in Comparative Example 1 at each meter reading is as follows Figure 4 As shown in the figure, it can be seen that the stability of the output of desalted water cannot be guaranteed.

[0084] At the same time, the method in Comparative Example 1 also requires the consumption of a large amount of industrial salt. The amount of industrial salt is as follows: Figure 5 As shown in the figure, it can be seen that the consumption of industrial salt is high and the production cost is high.

[0085] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for producing demineralized water for ironmaking production, characterized in that: include: Multi-stage filters, at least two-stage ultrafiltration processors, multi-stage reverse osmosis processors; The raw water inlet pipe of the reservoir is connected with the water inlet pipes of each filter; the ultrafiltration processors of each level are connected in series; The water outlet of each filter is respectively connected to the water inlet pipeline of the first-stage ultrafiltration processor; The water outlet of the N-stage ultrafiltration processor is connected to the water inlet pipeline of the filtered water storage tank (1); The water outlet of the filtered water storage tank (1) is connected to the water inlet pipeline of the first-stage reverse osmosis processor; the reverse osmosis processors of each stage are connected in series, and the water outlet of the N-stage reverse osmosis processor is connected to the desalted water storage tank (3) pipeline; The inflow rate of the treated reservoir raw water is 180~220m 3 / h, hardness is 1.5mmol / L; turbidity is 15-20NTU; The turbidity of raw water is below 5NTU after being treated by multi-stage filters; The water flow rate of the ultrafiltration processor used is 0.2 to 0.7 tons / hour; The conductivity of the effluent from the reverse osmosis processor is 2.1 to 25.0 μS / cm; The water flow rate of the reverse osmosis processor is 0.1-0.3 tons / hour; The conductivity of the obtained desalted water is 8-11 us / cm, and the hardness is below 0.01 mol / L.

2. The method for producing demineralized water for ironmaking production according to claim 1, characterized in that: Filters include: A tank body (2), a first filter material layer (241), a second filter material layer (242), a third filter material layer (243), a fourth filter material layer (244), a filter plate (233), a water inlet (221), and a water outlet (224); A filter plate (233) is disposed at the lower part of the tank body (2); a first filter material layer (241), a second filter material layer (242), a third filter material layer (243), and a fourth filter material layer (244) are stacked on the filter plate (233) in order from top to bottom; The water inlet (221) is arranged directly opposite to the cavity of the tank body (2) above the fourth filter material layer (244); the water outlet (224) is arranged directly opposite to the cavity of the tank body (2) below the first filter material layer (241); The first filter material layer 241 is filled with quartz sand medium with a particle size of 100-200 meshes, the second filter material layer 242 is filled with quartz sand medium with a particle size of 8 mm; the third filter material layer 243 is filled with quartz sand medium with a particle size of 15 mm; the fourth filter material layer 244 is filled with quartz sand medium with a particle size of 20 mm.

3. The method for producing demineralized water for ironmaking production according to claim 2, characterized in that: Filters include: A water inlet pipe, a backflow pipe, a filter water inlet valve (222), and a filter backflow valve (223); The water inlet pipe and the backflow pipe are respectively connected to the water inlet (221) of the filter; the water inlet pipe is provided with a filter water inlet valve (222); and the backflow pipe is provided with a filter backflow valve (223).

4. The method for producing demineralized water for ironmaking production according to claim 2, characterized in that: Filters include: A reverse inlet pipe, a water outlet pipe, a filter reverse inlet valve (225), and a filter outlet valve (226); The reverse inlet pipe and the water outlet pipe are respectively connected to the water outlet (224) pipeline; a filter reverse inlet valve (225) is arranged on the reverse inlet pipe; and a filter outlet valve (226) is arranged on the water outlet pipe.

5. The method for producing demineralized water for ironmaking production according to claim 1, characterized in that: Filters include: A vent pipe and a filter vent valve (227); the vent pipe is connected to the water outlet (224) pipeline; and a filter vent valve (227) is arranged on the vent pipe.

6. The method for producing demineralized water for ironmaking production according to claim 3 or 5, characterized in that: Filters include: The sewage pipe (231); the vent pipe and the backflow pipe are respectively connected to the sewage pipe (231).

7. The method for producing demineralized water for ironmaking production according to claim 1, characterized in that: The ultrafiltration processor comprises: a second ultrafiltration processor (12) and a first ultrafiltration processor (11); the water inlet of the first ultrafiltration processor (11) is connected to a filter pipeline; the water outlet of the first ultrafiltration processor (11) is connected to a water inlet pipeline of the second ultrafiltration processor (12); the water outlet of the second ultrafiltration processor (12) is connected to a water inlet pipeline of a filtered water storage tank (1); The water outlet flow rate of the first ultrafiltration processor (11) is 0.2 tons / hour; The water outlet flow rate of the second ultrafiltration processor (12) is 0.7 tons / hour.

8. The method for producing demineralized water for ironmaking production according to claim 1, characterized in that: The reverse osmosis processor comprises: a first reverse osmosis processor (31) and a second reverse osmosis processor (32); the water inlet of the first reverse osmosis processor (31) is connected to the water outlet pipeline of the filtered water storage tank (1); the water outlet of the first reverse osmosis processor (31) is connected to the water inlet pipeline of the second reverse osmosis processor (32); the water outlet of the second reverse osmosis processor (32) is connected to the water inlet pipeline of the desalted water storage tank (3); The conductivity of the effluent from the first reverse osmosis processor (31) is 25.0 μS / cm, and the effluent flow rate is 0.1 ton / hour; The conductivity of the outlet water of the second reverse osmosis processor (32) is 2.1 μS / cm, and the outlet water flow rate is 0.3 tons / hour.

9. The method for producing demineralized water for ironmaking production according to claim 1, characterized in that: include: A plurality of pumps (211) and a plurality of valves (212); the pumps (211) and valves (212) are arranged at intervals on the raw water inlet pipe of the reservoir; Pumps (211) and valves (212) are arranged at intervals on the pipelines connecting the filter and the ultrafiltration processor; Pumps (211) and valves (212) are arranged at intervals on the pipeline connecting the filtered water storage tank (1) and the reverse osmosis processor.

10. The method for producing demineralized water for ironmaking production according to claim 1, characterized in that: include: A plurality of sewage discharge valves (121); sewage discharge valves (121) are arranged on sewage discharge pipelines of the ultrafiltration processor and the reverse osmosis processor.

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