CN111453861A - Agent and method for removing calcium and magnesium ions in high-salinity wastewater - Google Patents

Agent and method for removing calcium and magnesium ions in high-salinity wastewater Download PDF

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CN111453861A
CN111453861A CN202010422680.1A CN202010422680A CN111453861A CN 111453861 A CN111453861 A CN 111453861A CN 202010422680 A CN202010422680 A CN 202010422680A CN 111453861 A CN111453861 A CN 111453861A
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calcium
magnesium ions
salinity wastewater
removal
mgal
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文方
王志煌
贾尔恒·阿哈提
曹银贵
邓葵
巩梦
廖娜
曾琪静
孙燕荣
王娜
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Xinjiang Uygur Autonomous Region Academy Of Environmental Protection Science
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02—Softening water by precipitation of the hardness
    • C02F5/06—Softening water by precipitation of the hardness using calcium compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02—Softening water by precipitation of the hardness

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Abstract

The invention provides a medicament and a method for removing calcium and magnesium ions in high-salinity wastewater, relates to the technical field of wastewater treatment, and solves the technical problems that the existing ion exchange method, membrane separation method and electric flocculation method have high requirements on the quality of raw water, and the existing medicament and adsorbent softening method have no proper medicament and do not achieve the removal effect. The removal agent is a mixture of calcium oxide and sodium metaaluminate or Mg/Al hydrotalcite; the mixture of calcium oxide and sodium metaaluminate is obtained by mixing the substances of calcium and aluminum according to the mass ratio; the Mg/Al hydrotalcite is HTC obtained by roasting at 400 ℃ for 4 hoursS-400-MgAl; the method adopts the two removal agents and sets corresponding reaction temperature, stirring speed and reaction time. The two removal agents have good removal effect on calcium and magnesium ions, and in the calcium and magnesium ion removal method, the two removal agents are put into high-salinity wastewater, and the reaction temperature, the stirring speed and the reaction time are setAnd better removal effect of calcium and magnesium ions is realized.

Description

Agent and method for removing calcium and magnesium ions in high-salinity wastewater
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a medicament and a method for removing calcium and magnesium ions in high-salinity wastewater.
Background
High salinity wastewater refers to wastewater containing organic matter and at least a Total Dissolved Solids (TDS) mass fraction greater than 3.5%, having a high water content, and having inorganic salt ions K+、Na+、Ca2+、Mg2+、Cl-、SO4 2-High equivalent content, large change of water quality and quantity, complex components, difficult biochemical degradation and the like, and is very representative industrial wastewater. In recent years, in order to realize the recycling of salt in high-salinity wastewater in the form of simple substance salt and realize resource utilization, many enterprises adopt a multi-stage salt separation process combining a nano-filtration salt separation process and evaporation concentration-cooling crystallization to separate salt and water in the high-salinity wastewater, condensed water is recycled in industrial production, and crystallized salt is subjected to centralized treatment. In the treatment process, scaling ions are separated out and attached to the walls of membranes or tubes through membrane concentration or evaporation concentration to form hard scales which are difficult to fall off, the water production efficiency of the membranes and evaporation is reduced if the hard scales are formed, and membranes, pipelines or devices are blocked if the hard scales are formed, so that the reduction of a large amount of scaling ions contained in the wastewater is very important during pretreatment.
The main methods for removing calcium and magnesium ions from high-salinity wastewater comprise a medicament softening method, an adsorption method, an ion exchange method, a membrane separation method, an electric flocculation method and the like. The traditional medicament softening method comprises a lime softening method, a lime gypsum softening method and a lime soda softening method, wherein calcium and magnesium ions in water are converted into hydroxide or carbonate precipitates by adding chemical agents, the used agents are low in price and wide in source and are convenient to use, but the water treated by the method is alkaline and the pH value needs to be adjusted; the adsorption method is characterized in that calcium and magnesium ions are adsorbed on the surface or inside of the waste water by utilizing an adsorbent so as to reduce the concentration of the calcium and magnesium ions in the waste water, the adsorption method is simple and convenient to operate, good in treatment effect, low in price of the adsorbent and wide in source, but the adsorbent is regenerated frequently; the ion exchange method replaces calcium and magnesium ions by a cation exchange column so as to achieve the aim of removing the calcium and magnesium ions, has high removal rate and stable treatment effect, but ion exchange resin is easy to block, the resin cost is high, and the regeneration process is complicated; the membrane separation method realizes the separation of calcium and magnesium ions by utilizing the driving force formed by pressure difference, concentration difference and the like at two ends of the membrane, thereby reducing the hardness of effluent, has high efficiency, simple operation and good separation performance, can effectively avoid secondary pollution, but also has the problems of easy pollution of the membrane surface and concentration polarization, difficult cleaning and poor durability; the electric flocculation method utilizes anode metal to dissolve out to generate hydrolysis-polymerization reaction, generates flocculating constituents to complex and adsorb pollutants in water and aggregates the pollutants into clusters to remove the pollutants, and has the advantages of multiple pollutant removal types, high efficiency, wide application pH range, compact device, small occupied area and the like. Wherein, the ion exchange method, the membrane separation method, the electric flocculation method and the like have higher requirements on the quality of raw water.
The applicant has found that the prior art has at least the following technical problems:
the existing ion exchange method, membrane separation method and electric flocculation method have higher requirements on the quality of raw water, no proper medicament is used in the medicament softening method and the adsorbent softening method, and different reaction conditions are not set so as to achieve better calcium and magnesium ion removing effect.
Disclosure of Invention
The invention aims to provide a medicament and a method for removing calcium and magnesium ions in high-salinity wastewater, and aims to solve the technical problems that an ion exchange method, a membrane separation method and an electric flocculation method in the prior art have high requirements on raw water quality, no proper medicament exists in a medicament softening method and an adsorbent softening method, and different reaction conditions are not set so as to achieve a better calcium and magnesium ion removal effect. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the medicament for removing calcium and magnesium ions in high-salinity wastewater provided by the invention is used for removing calcium and magnesium ions in high-salinity wastewater, and is a mixture consisting of calcium oxide and sodium metaaluminate or Mg/Al hydrotalcite; the mixture of calcium oxide and sodium metaaluminate is obtained by mixing the substances of calcium and aluminum according to the mass ratio; the Mg/Al hydrotalcite is HTC obtained by roasting at 400 ℃ for 4 hoursS-400-MgAl。
A method for removing calcium and magnesium ions in high-salinity wastewater adopts a removing agent which is obtained by mixing a mixture of calcium oxide and sodium metaaluminate according to the mass ratio of calcium to aluminum; and (3) putting the removal agent into the high-salinity wastewater, and removing calcium and magnesium ions in the high-salinity wastewater by setting a feeding ratio, a reaction temperature, a stirring speed and reaction time.
Optionally, the dosing ratio of the method is determined according to the mass ratio of calcium to aluminum being 1: 1.
Alternatively, the reaction temperature of the process is room temperature; the stirring speed of the method is 700 r/min.
Alternatively, the reaction time of the process is 1 hour.
The method for removing calcium and magnesium ions in high-salinity wastewater adopts the HTCS-400-MgAl; subjecting the HTC toS-400-MgAl is put into high salinity wastewater by setting the HTCSThe adding amount of 400-MgAl, the reaction temperature, the stirring speed and the reaction time are used for removing calcium and magnesium ions in the high-salinity wastewater.
Optionally, the HTCSThe amount of-400-MgAl added was 400 g/L.
Alternatively, the reaction temperature of the process is 25 ℃ or 55 ℃.
Optionally, the stirring speed of the method is 1000 r/min.
Alternatively, the reaction time of the process is 8 hours.
Any technical scheme can at least produce the following technical effects:
the invention mixes the calcium oxide and the sodium metaaluminate according to the mass ratio of the calcium to the aluminum to obtain the mixture or HTCSthe-400-MgAl is used as a medicament for removing calcium and magnesium ions in the high-salinity wastewater, and the removal effect is good. In the calcium and magnesium ion removal method, after the two removal agents are put into the high-salinity wastewater, the optimal reaction variable is obtained by setting the reaction temperature, the stirring speed, the reaction time and the like, so that the better removal effect of calcium and magnesium ions in the high-salinity wastewater is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 shows CaO + NaAlO2A schematic diagram of the influence of different addition ratios on the removal rate of calcium and magnesium ions in water;
FIG. 2 is a HTCSA schematic diagram of the influence of different adding amounts of 400-MgAl on the removal rate of calcium and magnesium ions in water;
FIG. 3 is a graph of different reaction temperatures versus CaO + NaAlO2And HTCS-400-MgAl effect diagram for removing calcium and magnesium ions from water;
FIG. 4 is a graph of the different stirring rates vs. CaO + NaAlO2And HTCS-400-MgAl effect diagram for removing calcium and magnesium ions from water;
FIG. 5 is a graph of different reaction times vs. CaO + NaAlO2The influence schematic diagram of removing calcium and magnesium ions in water;
FIG. 6 shows different reactionsIndirect HTCSSchematic diagram of the effect of-400-MgAl on the removal of calcium and magnesium ions from water.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a calcium and magnesium ion removing agent in high-salinity wastewater, which is used for removing calcium and magnesium ions in the high-salinity wastewater. The agent is calcium oxide (CaO) and sodium metaaluminate (NaAlO)2) The mixture of calcium oxide and sodium metaaluminate is obtained by mixing the calcium oxide and sodium metaaluminate according to the quantity ratio of calcium to aluminum, the mixture of calcium oxide and sodium metaaluminate is a medicament of a medicament softening method, and the quantity ratio of calcium to aluminum can be 0.5: 1. 1: 1. 1.5: 1. 2: 1. 2.5: 1, etc. After the softening agent consisting of calcium oxide and sodium metaaluminate is put into the high-salinity wastewater, the high-salinity wastewater has certain alkalinity, so that calcium ions, aluminum ions and chloride ions in the wastewater can generate chemical reaction when meeting, and the generated Ca4Al2Cl2(OH)12Is one of Freund's salt, is a layered compound with a structure similar to hydrotalcite-like compound, thereby achieving the effect of removing calcium and magnesium ions. Further, as shown in fig. 1 and table 2, the ratio of the amounts of calcium oxide, calcium of sodium metaaluminate, and aluminum is 1: the total removal rate of calcium and magnesium ions is highest at 1 hour. The agent may also be Mg/Al Hydrotalcite (HTC)SMgAl) and Mg/Al hydrotalcite has adsorption effect on anions and cations in water after being added into high-salinity wastewater, and more surface sites for exchanging with calcium and magnesium ions are formed along with the increase of the added mass concentration. The Mg/Al hydrotalcite of the invention is HTC obtained by roasting for 4 hours at 400 DEG CS-400-MgAl，HTCS400-MgAl as HTCS-heat treated product of MgAl, HTCSCalcination of MgAl in a muffle furnace at 400 ℃ for 4 hours to obtain HTCS400-MgAl, and cooling to room temperature in a drier to obtain HTCS400-MgAl, which is generally put into a sealed bag for storage. HTCSthe-400-MgAl loses interlayer anions and free water after being roasted, and has better adsorption effect on calcium and magnesium ions under the same addition amount compared with Mg/Al hydrotalcite.
The invention provides a method for removing calcium and magnesium ions in high-salinity wastewater, wherein a removing agent adopted by the method is obtained by mixing a mixture of calcium oxide and sodium metaaluminate according to the mass ratio of calcium to aluminum. The removal agent is put into the high-salinity wastewater, and calcium and magnesium ions in the high-salinity wastewater are removed by setting the adding ratio, the reaction temperature, the stirring speed and the reaction time. The reaction temperature, the stirring speed and the reaction time are important factors influencing the reaction rate in the chemical reaction for removing the calcium and magnesium ions in the high-salinity wastewater, and the optimal reaction variable is obtained by setting different values of the influencing factors, so that the better removal effect of the calcium and magnesium ions can be realized.
In order to obtain the best removal effect of calcium and magnesium ions, the invention obtains corresponding data through experiments. The wastewater used in the experiment is desulfurization wastewater of a certain thermal power plant, namely raw water, and the water quality condition of the raw water is shown in table 1 through detection, wherein the pH is directly measured by a pH meter, the total hardness is measured by an EDTA titration method, the total alkalinity is measured by a hydrochloric acid titration method, the calcium and magnesium ion concentration is measured by inductively coupled plasma atomic emission spectrometry (ICP-AES), and the conductivity is directly measured by a conductivity meter.
TABLE 1 quality of raw Water
Figure BDA0002497519490000051
The test method comprises the steps of firstly measuring 100m L experimental wastewater in a 250ml conical flask, placing the conical flask on a six-unit constant-temperature magnetic stirrer, adjusting the rotating speed to 700r/min and the temperature to 25 ℃, and adding different amounts of CaO + NaAlO2(i.e., a mixture of calcium oxide and sodium metaaluminate in a ratio of the amounts of calcium and aluminum), HTCS400-MgAl, sealing the bottle mouth with a sealing film, reacting for 4hTaking supernatant to detect the concentration of calcium and magnesium ions. The concentrations of calcium and magnesium ions in the wastewater after the treatment of the two agents with different addition amounts are shown in Table 2.
TABLE 2 concentration of calcium and magnesium ions in water after treatment with two agents
Figure BDA0002497519490000052
Figure BDA0002497519490000061
The overall method of the subsequent experiment is unchanged, and as shown in table 3, different reaction temperatures, stirring speeds and reaction times are set to observe the influence of the factors on the removal of calcium and magnesium ions in water by the medicament. The concentration of calcium and magnesium ions is measured on a computer according to inductively coupled plasma atomic emission spectrometry (HJ776-2015) for measuring 32 elements in water.
Table 3 experimental influence factor setting table
Figure BDA0002497519490000062
The experiment is subjected to quality control according to the requirements of quality assurance and quality control sections in inductively coupled plasma atomic emission spectrometry (HJ776-2015) for determination of 32 elements in water quality.
Drawing a standard curve to ensure that the correlation coefficient of the standard curve is more than or equal to 0.995, and performing calibration check on 10 samples to be analyzed by using a middle point concentration calibration solution of the standard curve, wherein the relative deviation of the point concentration is less than or equal to 10%; 3 parallel samples are made for each batch of samples, and the relative deviation of the parallel determination result is less than or equal to 25 percent.
As an alternative embodiment, CaO + NaAlO is used in the method2(i.e., a mixture of calcium oxide and sodium metaaluminate in a ratio of the amounts of calcium and aluminum) at a ratio of 1: 1. As shown in Table 2 and FIG. 2, when CaO + NaAlO2When the adding ratio is 1:1, the removal rate of calcium and magnesium ions in the wastewater is the highest and is 98.02 percent (the calculation process is 1-91.588/(2605.317+ 2011.286)).
In an alternative embodiment, the reaction temperature of the process is room temperature. As shown in Table 4 and FIG. 3, CaO + NaAlO was added at different reaction temperatures2For the addition of a calcium oxide and sodium metaaluminate water sample, the reaction temperature has little influence on the removal rate of calcium and magnesium ions, and the change range of the removal rate of calcium and magnesium ions in the wastewater is very small and basically ranges from 97% to 98% (the average value of the total ion concentration is 110 mg/L, the concentration of calcium ions in raw water is 2605.317 mg/L, the concentration of magnesium ions is 2011.286 mg/L, the removal rate of calcium and magnesium ions is 1-110/(2605.317+2011.286), and the calculation result is about 97% to 98%), which indicates that the addition of calcium oxide and sodium metaaluminate can be directly carried out at room temperature during the reaction and reduces the treatment cost.
TABLE 4 CaO + NaAlO at different reaction temperatures2Concentration of calcium and magnesium ions in wastewater treated by HTCS-400-MgAl
Figure BDA0002497519490000071
In an alternative embodiment, the method is carried out at a stirring speed of 700 r/min. As shown in Table 5 and FIG. 4, for the water sample containing calcium oxide and sodium metaaluminate, the removal rate of calcium and magnesium ions in the wastewater increases and then decreases as the stirring speed increases, and when the stirring speed is 700r/min, the removal rate is 98.35% at most (the calculation process is 1-76.295/(2605.317+2011.286)), so that the best effect of removing calcium and magnesium ions is achieved at a stirring speed of 700 r/min. When the stirring speed is increased from 700r/min to 1600r/min, the formation of partial precipitated particles is destroyed because of the increase of the rotating speed, thereby causing the reduction of the removal rate of calcium and magnesium ions.
TABLE 5 calcium and magnesium ion concentration in wastewater treated with CaO + NaAlO2 and HTCS-400-MgAl at different stirring speeds
Figure BDA0002497519490000072
As an alternative embodiment, the reaction time of the process is 1 hour. As shown in Table 6 and FIG. 5, the effect of the reaction time of 0.5h, 1h, 1.5h, 2h, 2.5h on the removal of calcium and magnesium ions from the high-salinity wastewater gradually decreased with the increase of the reaction time, but the range of the change was very small, and the removal rate was 98.11% at the maximum when the reaction time was 1h (the calculation process was: 1-86.837/(2605.317+2011.286)), thereby indicating that the reaction time could be decreased and the treatment efficiency could be improved by adding calcium oxide and sodium metaaluminate.
TABLE 6 concentration of Ca and Mg ions in wastewater treated with CaO + NaAlO2 at different reaction times
Figure BDA0002497519490000081
The invention provides a method for removing calcium and magnesium ions in high-salinity wastewater, and the removing agent adopted by the method is HTC provided by the inventionS400-MgAl. HTC (high temperature chemical vapor deposition)S-400-MgAl is put into high-salinity wastewater by setting HTCSThe adding amount of 400-MgAl, the reaction temperature, the stirring speed and the reaction time are controlled to remove calcium and magnesium ions in the high-salinity wastewater. The reaction temperature, the stirring speed and the reaction time are important factors influencing the reaction rate in the chemical reaction for removing the calcium and magnesium ions in the high-salinity wastewater, and the optimal reaction variable is obtained by setting different values of the influencing factors, so that the better removal effect of the calcium and magnesium ions can be realized. The present method also performed the aforementioned experiments.
As an alternative embodiment, HTC in the methodS400-MgAl in an amount of 400 g/L, when HTC is used, as shown in Table 2 and FIG. 2SThe highest removal rate of calcium and magnesium ions in the wastewater is 91.94% when the adding amount of 400-MgAl is 40g (corresponding to 100ml of wastewater, so the adding amount of 400g in each liter of wastewater), and the highest removal rate is 1-372.187/(2605.317+ 2011.286).
As an alternative embodiment, the reaction temperature of the process is 25 ℃ or 55 ℃. As shown in Table 4 and FIG. 3, the removal rate was significantly increased from 91.15% (calculated as: 1-408.648/(2605.317+2011.286)) to 94.40% (calculated as: 1-258.513/(2605.317+2011.286)) when the reaction temperature was increased from 15 ℃ to 25 ℃, and when the temperature was 55 ℃ as shown in Table 4 and FIG. 3The maximum rate of removal is 95.37 percent (the calculation process is 1-213.858/(2605.317+2011.286)), and for saving energy, HTC is added subsequentlySWhen the temperature is-400-MgAl, the reaction temperature is controlled to be about 25 ℃.
In an alternative embodiment, the method is carried out at a stirring speed of 1000 r/min. As shown in Table 5 and FIG. 4, the removal rate of calcium and magnesium ions in the wastewater increased and then decreased with the increase of the stirring speed, because the increase of the stirring speed increases the chance of collision between HTCS-400-MgAl and calcium and magnesium ions, the removal rate increased, and the higher stirring speed causes the calcium and magnesium ions with weaker adsorption between HTCS-400-MgAl layers to be released from the solution, so that the stirring rate decreased, and when the stirring speed was 1000r/min, the removal rate was up to 93.94% (calculated as: 1-279.986/(2605.317+ 2011.286)).
As an alternative embodiment, the reaction time of the process is 8 hours. As shown in Table 7 and FIG. 6, HTC was addedSAnd for a 400-MgAl water sample, the influence on the removal of calcium and magnesium ions in the high-salinity wastewater is realized when the reaction time is 2h, 4h, 6h, 8h and 10 h. The removal rate of calcium and magnesium ions in the wastewater is increased and then reduced along with the increase of the reaction time, when the reaction time is prolonged from 4h to 8h, the removal rate of the calcium and magnesium ions is slowly increased, when the reaction time is 8h, the removal rate is at most 93.71% (the calculation process is: 1-290.082/(2605.317+2011.286)), and when the reaction time is prolonged, the removal rate of the calcium and magnesium ions is obviously reduced, mainly due to the partial resolution of the adsorbent. Therefore, the calcium and magnesium ion removal rate is highest when the reaction time is 8 hours.
TABLE 7 HTC at different reaction timesSConcentration of calcium and magnesium ions in wastewater treated by-400-MgAl
Figure BDA0002497519490000091
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A medicament for removing calcium and magnesium ions in high-salinity wastewater is used for removing the calcium and magnesium ions in the high-salinity wastewater, and is characterized in that the medicament is a mixture of calcium oxide and sodium metaaluminate or Mg/Al hydrotalcite; the mixture of calcium oxide and sodium metaaluminate is obtained by mixing the substances of calcium and aluminum according to the mass ratio; the Mg/Al hydrotalcite is HTC obtained by roasting at 400 ℃ for 4 hoursS-400-MgAl。
2. A method for removing calcium and magnesium ions in high-salinity wastewater, which is characterized in that the removal agent adopted in the method is a mixture of calcium oxide and sodium metaaluminate according to the claim 1, which is obtained by mixing the calcium oxide and the sodium metaaluminate according to the mass ratio of calcium and aluminum; and (3) putting the removal agent into the high-salinity wastewater, and removing calcium and magnesium ions in the high-salinity wastewater by setting a feeding ratio, a reaction temperature, a stirring speed and reaction time.
3. The method for removing calcium and magnesium ions in high-salinity wastewater according to claim 2, wherein the adding ratio of the method is determined according to the ratio of the amount of calcium to aluminum being 1: 1.
4. The method for removing calcium and magnesium ions in high-salinity wastewater according to claim 2, characterized in that the reaction temperature of the method is room temperature; the stirring speed of the method is 700 r/min.
5. The method for removing calcium and magnesium ions in high-salinity wastewater according to claim 2, characterized in that the reaction time of the method is 1 hour.
6. A method for removing calcium and magnesium ions in high-salinity wastewater, which is characterized in that the removing agent adopted in the method is the HTC as defined in claim 1S-400-MgAl; subjecting the HTC toS-400-MgAl is put into high salinity wastewater by setting the HTCSThe adding amount of 400-MgAl, the reaction temperature, the stirring speed and the reaction time are used for removing calcium and magnesium ions in the high-salinity wastewater.
7. The method for removing calcium and magnesium ions in high-salinity wastewater according to claim 6, wherein the HTC comprisesSThe amount of-400-MgAl added was 400 g/L.
8. The method for removing calcium and magnesium ions in high-salinity wastewater according to claim 6, characterized in that the reaction temperature of the method is 25 ℃ or 55 ℃.
9. The method for removing calcium and magnesium ions in high-salinity wastewater according to claim 6, characterized in that the stirring speed of the method is 1000 r/min.
10. The method for removing calcium and magnesium ions in high-salinity wastewater according to claim 6, characterized in that the reaction time of the method is 8 hours.
CN202010422680.1A 2020-05-19 2020-05-19 Agent and method for removing calcium and magnesium ions in high-salinity wastewater Pending CN111453861A (en)

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CN108059269A (en) * 2017-09-26 2018-05-22 内蒙古久科康瑞环保科技有限公司 The system and technique of silica and hardness in a kind of removal industrial wastewater
CN108187604A (en) * 2018-01-30 2018-06-22 太原理工大学 It is a kind of while remove the method for anion and hardness in water body
CN109987740A (en) * 2019-01-29 2019-07-09 厦门稀土材料研究所 The method for precipitating calcium and magnesium in industrial wastewater
CN110668540A (en) * 2019-10-28 2020-01-10 上海电力大学 High-salinity wastewater precipitation desalination recycling process

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4227815A1 (en) * 1992-08-21 1994-02-24 Air Beteiligungs Gmbh Process for the spontaneous chemical precipitation of sulfates dissolved in water as ettringite and use of this process for the production of a low-chloride, aluminum oxide-containing gypsum anhydrite
CN102936065A (en) * 2011-08-16 2013-02-20 中国石油化工股份有限公司 Method for treating wastewater
JP2014210232A (en) * 2013-04-18 2014-11-13 山陽特殊製鋼株式会社 Method for processing alkaline waste water including calcium-eluting particles
CN107117738A (en) * 2017-04-24 2017-09-01 华中科技大学 A kind of Manganese Ore District method of wastewater treatment
CN108059269A (en) * 2017-09-26 2018-05-22 内蒙古久科康瑞环保科技有限公司 The system and technique of silica and hardness in a kind of removal industrial wastewater
CN108187604A (en) * 2018-01-30 2018-06-22 太原理工大学 It is a kind of while remove the method for anion and hardness in water body
CN109987740A (en) * 2019-01-29 2019-07-09 厦门稀土材料研究所 The method for precipitating calcium and magnesium in industrial wastewater
CN110668540A (en) * 2019-10-28 2020-01-10 上海电力大学 High-salinity wastewater precipitation desalination recycling process

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