CN114590933A - Method for processing grinding blocks by desulfurization slurry ion removal and concentrated solution resource preparation magnesium chloride cement method - Google Patents
Method for processing grinding blocks by desulfurization slurry ion removal and concentrated solution resource preparation magnesium chloride cement method Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
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Abstract
The invention discloses a method for treating desulfurized slurry ions and concentrated solution resource to prepare magnesium chloride cement-method grinding blocks, which is characterized in that desulfurized slurry is subjected to pretreatment, ultrafiltration and filtration, concentration by an IRCT system and preparation of magnesium chloride cement-method grinding blocks, zero discharge of desulfurized slurry is realized, the ultrafiltration system can effectively remove suspended matters in desulfurized slurry in the zero discharge process of desulfurized slurry, high-power concentration without consumption of softening agents, softening sludge and solid waste of crystalline salt are avoided, desalting and gypsum output coordination of desulfurized slurry are realized, concentrated solution-chlorine salt concentrated solution of the IRCT system is treated by adopting a magnesium chloride cement-method grinding block technology, grinding blocks are produced and used as knife stones, grinding with cutters and grinding of lacquer craftworks are widely carried out, and resource treatment of the concentrated solution-chlorine salt concentrated solution of the IRCT system is completed.
Description
Technical Field
The invention belongs to the technical field of water quality purification, and particularly relates to a method for processing a grinding block by a method for removing ions from desulfurized slurry and recycling concentrated solution to prepare magnesium chloride cement.
Background
At present, domestic desulfurization wastewater zero-discharge technologies can be mainly divided into two categories: concentration (membrane method, thermal method), evaporative crystallization and flue gas evaporation. The concentration and evaporative crystallization technology needs to reduce the scaling risk of treatment equipment, and usually needs to carry out reagent softening, particularly for a desulfurization wastewater zero-discharge project with high magnesium ion content, the reagent cost is high, and a large amount of solid waste mainly containing magnesium hydroxide is generated. Although a part of the concentration and evaporation crystallization system converts chloride ions in the desulfurization wastewater into sodium chloride through a salting-out process and utilizes the sodium chloride, magnesium ions are completely converted into solid waste, so that great waste of resources is caused; and the waste heat of the flue gas does not need chemical softening treatment, but the heat value of the flue gas is carried by a large amount of water vapor in the evaporation process, so that the coal consumption of power generation is increased.
The technology of 'waste water concentration (membrane method, thermal method) + evaporative crystallization' is adopted, because the rear-stage evaporative crystallization technology needs the membrane method concentration of the front stage to soften water, otherwise, the large-scale scaling phenomenon of an evaporator can occur, the water softening needs to consume a large amount of softening agents, and simultaneously, a large amount of sludge waste is generated, so that the construction cost and the operation cost are increased, the operation cost of waste water treatment is high, the operation stability of the technology is poor because the incoming water fluctuation of waste water is large, and meanwhile, if the evaporated crystal salt can not be used as a byproduct, the crystal salt becomes industrial waste solid, and the disposal cost of the crystal salt is also needed to be increased.
The flue gas evaporation process technology is relatively simple, for example, the technology of 'wastewater concentration (membrane method, thermal method) + flue gas evaporation' is adopted, the membrane concentration technology needs to carry out front-stage pretreatment to soften water, otherwise, a membrane element of a membrane treatment unit is blocked and cannot normally operate; the thermal method concentration technology also needs to consume a flue gas heat value, so that the power generation coal consumption is increased; the evaporation unit of the flue needs to consume more flue gas heat value, thereby increasing the coal consumption of power generation and reducing the boiler efficiency. Under the situation that the price of coal is high nowadays, the increase of the coal consumption of power generation brings huge economic pressure to power generation enterprises, and the environmental protection pressure is increased at the same time. If the technology of direct injection and evaporation to dryness of the waste water non-concentration flue is adopted, although a membrane concentration unit is reduced, the amount of the waste water treated at the moment is larger, the construction and maintenance cost of an evaporation system is higher, the heat value of the smoke consumed in the evaporation process is larger, and the coal consumption of power generation is greatly increased; the technology is directly connected to the main flue of the boiler, and if a fault occurs, the safe operation of the boiler is greatly threatened, so that the safety of the technology is lower than that of other technologies; meanwhile, the direct injection drying technology of the flue is only suitable for the condition of small water quantity, and the application range of the process is limited when the waste water quantity is large. In conclusion, the existing desulfurization wastewater zero-discharge process has high investment and operation cost and unstable operation. The more typical comparison is as follows:
at present, both a concentration and evaporative crystallization process and a flue gas evaporation process mainly aim at the solidification treatment of desulfurization wastewater of a power plant to realize zero discharge of the wastewater of the power plant, the treatment difficulty of products after the wastewater solidification treatment is very high, secondary pollution is easily caused, and effective cooperation is difficult to form with the operation of a desulfurization system, the current power plant lacks an effective adjusting means for impact load of the concentration of chloride ions in desulfurization slurry changing along with seasons, the adjustment and control of the concentration of the chloride ions in the desulfurization slurry are realized only by discharging the wastewater, the concentration of the chloride ions in the desulfurization slurry fluctuates greatly along with the seasons, mainly because a large amount of snow melting agents (calcium chloride and sodium chloride are used as main components) are required to be sprayed into fire coal to prevent power generation fire from freezing in winter, the content of the chloride ions in the fire coal is very high, and the chloride ions carried by the fire coal can be intercepted along with flue gas after the combustion of a boiler, the desulfurization slurry entering the desulfurization tower has the disadvantages that the desulfurization slurry is foamed and the desulfurization efficiency is reduced due to the over standard chloride ion concentration in the desulfurization slurry, the fluctuation of the chloride ion concentration in the desulfurization slurry is large, the design redundancy of a zero-emission system (designed by the maximum chloride ion value) is increased, the construction scale of the zero-emission system is increased, the one-time investment is high, the operation and maintenance cost is high, and the implementation of a desulfurization wastewater zero-emission project is limited to a great extent.
Disclosure of Invention
Aiming at the defects, the invention utilizes an ultrafiltration system to effectively remove solid suspended matters in the desulfurization slurry, utilizes nanofiltration and reverse osmosis to extract sodium chloride, realizes the consumption of the sodium chloride and the self circulation in the extraction system, utilizes IRCT (electrodialysis) technology to realize high-concentration (concentration ratio is 6 times) of wastewater (containing the desulfurization slurry) with high hardness and high salt content under the condition of no softening, the TDS content of the concentrated solution can reach more than 18 percent under the condition of designed water quality, adopts the magnesium chloride cement method grinding block technology to treat the concentrated solution-chlorine salt concentrated water of the IRCT system to produce grinding blocks which are used as knife stones and can also be used as grinding blocks of materials such as metals and the like, the grinding blocks made of magnesium chloride cement are widely applied to grinding with cutters, and the grinding of lacquer artware has the advantages of small self-damage, high grinding efficiency, strong self-sharpness and relatively traditional sintered oilstone, has the advantages of no need of soaking in water for half an hour, and convenient use.
The invention is realized by the following technical scheme: a method for processing a magnesium chloride cement grinding block by removing ions from desulfurized slurry and recycling concentrated solution comprises the following steps:
(1) enabling the desulfurization slurry to enter a pretreatment system, and removing solid suspended matters in the desulfurization slurry;
(2) the desulfurized slurry passing through the pretreatment system is transported to an ultrafiltration system through a water pump, and the desulfurized slurry meeting the requirement of entering an IRCT system is produced under the action of an ultrafiltration membrane;
(3) in an IRCT system, cations (calcium ions, magnesium ions, sodium ions and the like) in the desulfurized slurry clarified liquid are driven by a direct-current electric field to migrate into a chloride salt circulation box, and anions (chloride ions, sulfate ions and the like) in the desulfurized slurry clarified liquid are driven by the direct-current electric field to migrate into a sodium salt circulation box;
(4) sodium salt concentrated water in the sodium salt circulating tank intercepts sodium ions by sodium salt nanofiltration, the sodium ions intercepted by the sodium salt nanofiltration enter a sodium chloride circulating tank, desalted liquid enters a fresh water circulating tank, the sodium ions are intercepted by the fresh water nanofiltration, and the sodium ions intercepted by the fresh water nanofiltration enter the sodium chloride circulating tank;
(5) concentrating a sodium chloride solution in a sodium chloride circulating box by using reverse osmosis, keeping the concentration of sodium chloride ions, ensuring the normal operation of an IRCT system, returning sodium chloride concentrated water generated by reverse osmosis to the sodium chloride circulating box, and feeding fresh water into the circulating box for water replenishing and recycling;
(6) adding magnesium oxide powder into concentrated chlorine salt concentrated water in a chlorine salt circulating box, stirring to form turbid liquid, adding an abrasive into a mixing box, drying in the shade for solidification, performing mould pouring after a period of heat preservation operation, and cutting into blocks after complete solidification to obtain grinding blocks.
As a preferred technical solution of the present invention, the pretreatment in the step (1) includes the following steps: collecting the desulfurization slurry by using a waste water tank, and then, allowing the desulfurization slurry to enter a flocculation reaction tank for solid precipitation; and clarifying in a clarification tank, delivering the produced water to a clear water tank, and conveying the produced water into an ultrafiltration system by using a water pump.
As a preferred technical scheme of the invention, the solid suspension in the step (1) is returned to the desulfurization slurry.
As a preferable technical scheme of the invention, the ultrafiltration system in the step (2) adopts a 6-core or multi-core ultrafiltration membrane to filter the desulfurization slurry.
As a preferable technical scheme of the invention, a self-cleaning filter is arranged in the ultrafiltration system in the step (2).
In the step (4), two or one of the two streams of concentrated water in the nano-salt nanofiltration and the nano-filtration of the fresh water sodium filtrate enter a sodium chloride circulating tank.
As a preferable technical scheme of the invention, the fresh water subjected to the fresh water nanofiltration in the step (4) enters a desulfurization slurry tank for recycling.
In a preferred embodiment of the present invention, the magnesium oxide in the step (6) is lightly calcined magnesium oxide with a concentration of 85% or more, and the required magnesium oxide purity is low and is easily achieved.
As a preferable technical scheme of the invention, the grinding agent in the step (6) is a plurality of kinds of coarse white corundum or carborundum.
As a preferred technical scheme of the invention, the grinding blocks obtained in the step (6) are cut into small blocks according to requirements.
Compared with the prior art, the invention has the beneficial effects that:
(1) carrying out front-end filtration on the pretreated desulfurization slurry by adopting an ultrafiltration system, taking out solid suspended matters in the desulfurization slurry, and returning the filtered suspended matters to the desulfurization slurry to form main components of gypsum separated from the slurry;
(2) the method comprises the steps of utilizing an IRCT technology to realize concentration of salt content of desulfurized slurry, producing high-concentration and high-concentration concentrated solution (chlorine salt concentrated solution), utilizing a nanofiltration system and a reverse osmosis system to carry out salt separation treatment in an IRCT system, extracting sodium chloride required by the operation of the IRCT system, and realizing internal consumption and self-circulation of the sodium chloride;
(3) the concentrated solution-chlorine salt concentrated water of the IRCT system is treated by adopting a magnesium chloride cement method grinding block technology to produce a grinding block which is used as a knife stone and is widely applied to grinding with a cutter and grinding of lacquer artware, and the grinding block has the advantages of small self-damage, high grinding efficiency, strong self-sharpening property, use advantage after no water soaking for half an hour compared with the traditional sintered oilstone and convenient use;
(4) the invention is suitable for desalting and decrement treatment of high-salt and high-hardness wastewater, does not need softening, has low operating cost, no secondary sludge and less investment, can directly concentrate strong brine to the salt content of more than 18 percent, reduces a plurality of step concentration links, has simple operation and maintenance, can be operated in a fully automatic unattended way, has no scaling risk in each link of the system and has high overall reliability of the system.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic diagram of the IRCT system process of the present invention;
FIG. 3 is a process flow diagram of the pretreatment and IRCT systems of the present invention;
FIG. 4 is a process flow diagram of a magnesium chloride cement-based grinding block making system of the present invention.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
The invention relates to a treatment method for preparing high-purity basic magnesium chloride whisker by removing ions from desulfurized slurry and recycling concentrated solution. The method comprises the following steps:
(1) and (4) enabling the desulfurization slurry to enter a pretreatment system to remove solid suspended matters in the desulfurization slurry.
A pretreatment system: the pretreatment adopts the sedimentation and clarification processes, a triple sedimentation tank and a radial flow clarification tank are used for removing high-content suspension in the desulfurization slurry, the design of unique equipment structure, water flow mode, hydraulic load and retention time is adopted, the reasonable sludge discharge mode is adopted for assistance, the high-suspension and high-hardness desulfurization slurry entering the system is ensured to be efficiently treated, flocculation and coagulant aids are not required to be added, the satisfactory treatment effect can be achieved, the effluent quality is clear, and the water inlet requirement of an ultrafiltration system is met.
(2) The desulfurization slurry passing through the pretreatment system is transported to an ultrafiltration system through a water pump, and the desulfurization slurry meeting the requirement of entering an IRCT system is produced under the action of an ultrafiltration membrane;
an ultrafiltration system: according to the water quality conditions of high suspended matters and high hardness of the desulfurization slurry, the 6-core pressure type ultrafiltration membrane made of polyether sulfone is selected and used in the method, the material of the surface of the membrane is modified, the anti-pollution capacity is high, the tolerance is durable, the backwashing is thorough, the quality of the outlet water is good, the pretreated desulfurization slurry is conveyed to an ultrafiltration system through a pump, the quality of the outlet water is good through the filtering effect of the ultrafiltration membrane, the requirement of the inlet water quality of an IRCT system is met, and the suspended solids intercepted by the ultrafiltration membrane are discharged into the pretreated inlet water through the backwashing and are retreated.
(3) In an IRCT system, cations (calcium ions, magnesium ions, sodium ions and the like) in the desulfurized slurry clarified liquid are driven by a direct-current electric field to migrate into a chloride salt circulation box, and anions (chloride ions, sulfate ions and the like) in the desulfurized slurry clarified liquid are driven by the direct-current electric field to migrate into a sodium salt circulation box;
(4) sodium salt concentrated water in the sodium salt circulating tank intercepts sodium ions by sodium salt nanofiltration, the sodium ions intercepted by the sodium salt nanofiltration enter a sodium chloride circulating tank, desalted liquid enters a fresh water circulating tank, the sodium ions are intercepted by the fresh water nanofiltration, and the sodium ions intercepted by the fresh water nanofiltration enter the sodium chloride circulating tank;
(5) concentrating a sodium chloride solution in a sodium chloride circulating box by using reverse osmosis, keeping the concentration of sodium chloride ions, ensuring the normal operation of an IRCT system, returning sodium chloride concentrated water generated by reverse osmosis to the sodium chloride circulating box, and feeding fresh water into the circulating box for water replenishing and recycling;
an IRCT system: the IRCT system adopts a multi-channel electrodialysis membrane stack to assist in configuring a nanofiltration system and a reverse osmosis system to realize high-power concentration of the desulfurization slurry, and the IRCT system selects a specially-made negative and positive membrane and flows to the configuration to realize ion recombination pairing in the desulfurization slurry and simultaneously realize ion concentration without softening treatment of the high-hardness desulfurization slurry and scaling blockage of a membrane channel, so that the difficult problems of no softening high-power concentration and no scaling of high-suspended substances and high-hardness wastewater are solved.
The desulfurized slurry after ultrafiltration treatment is conveyed to a desulfurized slurry channel of an IRCT system through a pump, the components of the desulfurized slurry and the IRCT channels are continuously circulated, ions migrate through different membranes under the action of a direct current electric field, finally, the ions in the desulfurized slurry channel migrate into chlorine salt and sodium salt concentrated water, the ion concentration is continuously reduced to form fresh water for recycling to a desulfurizing tower, the sodium salt concentrated water is used for extracting sodium chloride through a nanofiltration system and a reverse osmosis system, the material balance is kept, cations (mainly calcium ions and magnesium ions) in the desulfurized slurry and the chlorine ions in a sodium chloride solution migrate to the chlorine salt channel, the ions are continuously concentrated to form concentrated solution, the concentrated solution needs to be consumed and reaches the purpose of zero emission, and therefore, the concentrated solution is conveyed to a high-temperature flue bypass tower to be evaporated and solidified.
(6) Adding magnesium oxide powder into concentrated chlorine salt concentrated water in a chlorine salt circulating box, stirring to form turbid liquid, adding an abrasive into a mixing box, drying in the shade for solidification, performing mould pouring after a period of heat preservation operation, and cutting into blocks after complete solidification to obtain grinding blocks.
Adding magnesium oxide powder into final chlorine salt concentrated water of an IRCT system, requiring at least more than 85% of light-burned magnesium oxide, stirring into a suspension, finally adding materials such as white corundum or carborundum and the like as an abrasive, drying in the shade for solidification, carrying out certain heat preservation, finally completely solidifying, carrying out bulk pouring, and cutting the bulk into applicable small blocks. The technology mainly utilizes magnesium chloride of chloride concentrated water to manufacture a magnesium chloride cement base material, and utilizes white corundum or carborundum particles as a cutting and grinding material. The produced grinding block can be used as a knife stone and a metal material, the grinding block made of magnesium chloride cement is widely applied to grinding with a cutter and grinding of lacquer artware, and the grinding block has the advantages of small self-damage, high grinding efficiency, strong self-sharpening property, no need of soaking in water for half an hour, and convenient use.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for processing a magnesium chloride cement grinding block by removing ions from desulfurized slurry and recycling concentrated solution is characterized by comprising the following steps: the method comprises the following steps:
(1) enabling the desulfurization slurry to enter a pretreatment system, and removing solid suspended matters in the desulfurization slurry;
(2) the desulfurization slurry passing through the pretreatment system is transported to an ultrafiltration system through a water pump, and the desulfurization slurry meeting the requirement of entering an IRCT system is produced under the filtering action of an ultrafiltration membrane;
(3) in an IRCT system, cations (calcium ions, magnesium ions, sodium ions and the like) in the desulfurized slurry clarified liquid are driven by a direct current electric field to migrate into a chloride salt circulation box, and anions (chloride ions, sulfate ions and the like) are driven by the direct current electric field to migrate into a sodium salt circulation box;
(4) sodium salt concentrated water in the sodium salt circulating tank intercepts sodium ions by sodium salt nanofiltration, the sodium ions intercepted by the sodium salt nanofiltration enter a sodium chloride circulating tank, desalted liquid enters a fresh water circulating tank, the sodium ions are intercepted by the desalted liquid, and the sodium ions intercepted by the desalted liquid nanofiltration enter a sodium chloride solution;
(5) concentrating a sodium chloride solution in a sodium chloride circulating box by using reverse osmosis, keeping the concentration of sodium chloride ions, ensuring the normal operation of an IRCT system, returning sodium chloride concentrated water generated by reverse osmosis to the sodium chloride circulating box, and feeding fresh water into the circulating box for water replenishing and recycling;
(6) adding magnesium oxide powder into concentrated chlorine salt concentrated water in a chlorine salt circulating box, stirring to form turbid liquid, then adding an abrasive into a mixing box, pouring a mould, drying in the shade for curing, and cutting into blocks after completely curing after a period of heat preservation operation to obtain the grinding blocks.
2. The method for treating the magnesium chloride cement-process grinding blocks by removing ions from the desulfurized slurry and recycling the concentrated solution according to claim 1, which is characterized in that: the pretreatment system in the step (1) comprises the following steps: collecting the desulfurization slurry by using a waste water tank, and then, allowing the desulfurization slurry to enter a flocculation reaction tank for solid precipitation; and clarifying in a clarification tank, delivering the produced water to a clear water tank, and conveying the produced water into an ultrafiltration system by using a water pump.
3. The method for treating the magnesium chloride cement-process grinding blocks by removing ions from the desulfurized slurry and recycling the concentrated solution according to claim 1, which is characterized in that: and (2) returning the solid suspension obtained in the step (1) to the desulfurization slurry.
4. The method for treating the magnesium chloride cement-process grinding blocks by removing ions from the desulfurized slurry and recycling the concentrated solution according to claim 1, which is characterized in that: and (3) filtering the desulfurization slurry by using a 6-core or multi-core ultrafiltration membrane in the ultrafiltration system in the step (2).
5. The method for treating the magnesium chloride cement-process grinding blocks by removing ions from the desulfurized slurry and recycling the concentrated solution according to claim 1, which is characterized in that: and (3) arranging a self-cleaning filter in the ultrafiltration system in the step (2).
6. The method for treating the magnesium chloride cement-process grinding blocks by removing ions from the desulfurized slurry and recycling the concentrated solution according to claim 1, which is characterized in that: in the step (4), two or one of the two streams of concentrated water in the nano-salt nanofiltration and the nano-filtration of the fresh water sodium filtrate enter a sodium chloride circulating tank.
7. The method for treating the magnesium chloride cement-process grinding blocks by removing ions from the desulfurized slurry and recycling the concentrated solution according to claim 1, which is characterized in that: and (4) the fresh water subjected to the fresh water nanofiltration in the step (4) enters a desulfurization slurry tank for recycling.
8. The method for treating the magnesium chloride cement-process grinding blocks by removing ions from the desulfurized slurry and recycling the concentrated solution according to claim 1, which is characterized in that: in the step (6), the magnesium oxide is light-burned magnesium oxide with the concentration of more than 85%.
9. The method for treating the magnesium chloride cement-process grinding blocks by removing ions from the desulfurized slurry and recycling the concentrated solution according to claim 1, which is characterized in that: the grinding agent in the step (6) is various kinds of thick white corundum or carborundum.
10. The method for treating the magnesium chloride cement-process grinding blocks by removing ions from the desulfurized slurry and recycling the concentrated solution according to claim 1, which is characterized in that: and (4) cutting the grinding blocks obtained in the step (6) into small blocks according to requirements.
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| CN105036578A (en) * | 2015-08-18 | 2015-11-11 | 武桂君 | Magnesium oxychloride cement and manufacturing technique thereof |
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