CN112645367B - Method for preparing calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate from calcium-magnesium-containing leaching solution - Google Patents
Method for preparing calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate from calcium-magnesium-containing leaching solution Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C5/00—Fertilisers containing other nitrates
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Abstract
The invention discloses a method for preparing calcium sulfate, magnesium oxide and potassium nitrate calcium magnesium from calcium-magnesium-containing leaching solution, which comprises the following steps: simultaneously adding a potassium sulfate solution and a calcium magnesium ammonium nitrate concentrated solution into a reaction tank to perform decalcification reaction, and then adding an alkaline substance to perform neutralization reaction to obtain a calcium sulfate slurry; filtering the calcium sulfate slurry to obtain decalcified filtrate and calcium sulfate; adding alkaline substances into the decalcified filtrate to perform a magnesium removal reaction to prepare magnesium hydroxide precipitation liquid; filtering the magnesium hydroxide precipitate, calcining the magnesium hydroxide filter cake, and crushing to obtain magnesium oxide; concentrating and granulating the magnesium-removed filtrate to obtain potassium nitrate calcium magnesium. The calcium and magnesium compounds prepared by the method are respectively calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate, so that calcium and magnesium ion separation is realized, the manufacturing process flow is simple, the cost is low, the conversion rate is high, and the quality is stable and reliable; the produced potassium nitrate, calcium and magnesium are easy to be absorbed by fruit trees in agriculture and forestry.
Description
Technical Field
The invention relates to preparation of calcium and magnesium ion compounds, in particular to a method for preparing calcium sulfate, magnesium oxide and potassium nitrate calcium and magnesium from calcium and magnesium leaching solution.
Background
In phosphorite and chemical fertilizer processing enterprises, chemical mineral separation byproducts contain calcium and magnesium ion compounds, and the ion compounds are indispensable elements for agriculture and forestry fruit trees, so that the growth of the agriculture and forestry fruit trees is facilitated.
Therefore, the calcium-magnesium ion compound is prepared from the calcium-magnesium leaching solution of the chemical beneficiation byproducts, and is also one or more chemical fertilizer products which are developed and produced in important ways by phosphorite and chemical fertilizer processing enterprises. However, in the existing method, as shown in fig. 1, calcium and magnesium ions of the calcium-magnesium-containing compound prepared from the calcium-magnesium leaching solution are not separated, so that the obtained magnesium-containing calcium carbonate mixture has low utilization value, greatly limited application range, large actual production difficulty, high production cost, low filtrate conversion rate and unstable product content; therefore, the magnesium-containing calcium carbonate produced at present cannot be absorbed by agriculture and forestry fruit trees.
In view of this, the present invention is to provide a method for preparing a calcium and magnesium compound from which calcium and magnesium ions are separated.
Disclosure of Invention
Based on the above problems, the present invention aims to provide a method for preparing calcium sulfate, magnesium oxide and potassium nitrate calcium magnesium from calcium magnesium-containing leaching solution; the calcium and magnesium compounds prepared by the method are respectively calcium carbonate, magnesium oxide and potassium calcium magnesium nitrate, so that the separation of calcium and magnesium ions is realized, the added value of potassium is improved, the preparation process flow is simple, the cost is low, the conversion rate is high, and the quality is stable and reliable.
The technical scheme of the invention is as follows:
a method for preparing calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate from calcium-magnesium-containing leaching solution comprises the following steps:
adding a potassium sulfate solution and a calcium magnesium ammonium nitrate concentrated solution into a reaction tank at the same time, adding an alkaline substance for neutralization reaction after full decalcification reaction to obtain a calcium sulfate slurry;
filtering and decalcifying the calcium sulfate slurry to obtain decalcified filtrate and a calcium sulfate filter cake;
adding alkaline substances into the decalcification filtrate to perform a magnesium removal reaction to prepare magnesium hydroxide precipitation liquid;
filtering the magnesium hydroxide precipitation liquid to obtain magnesium removal filtrate and a magnesium hydroxide filter cake;
concentrating and granulating the magnesium-removed filtrate to obtain potassium nitrate calcium magnesium;
adding water into the magnesium hydroxide filter cake to wash to obtain magnesium hydroxide, and drying and calcining the magnesium hydroxide to obtain magnesium oxide;
and (3) adding water into the calcium sulfate filter cake to wash to obtain calcium sulfate.
In one embodiment, the method comprises the following steps of:
taking medium-low grade phosphorite as a raw material, sequentially carrying out crushing, calcining, digestion, leaching, filter pressing, separating and other working procedures, and discharging decalcification magnesium leaching solution and low-magnesium phosphate concentrate from a filter press; wherein, according to the mass percent: p (P) 2 O 5 More than or equal to 34.5 percent and MgO less than or equal to 0.85 percent; in the leaching treatment process, ammonium nitrate solution is required to be added;
and pumping the decalcified magnesium leaching solution to a two-effect countercurrent evaporation device for concentration treatment to obtain the calcium magnesium ammonium nitrate concentrated solution.
In one embodiment, preferably, the potassium sulfate solution is added into the concentrated solution containing ammonium nitrate, calcium and magnesium for reaction at 20-110 ℃ for 3-6 hours; the alkaline substance is calcium hydroxide or ammonia water, and the pH value of the slurry is controlled to be 6.5-7.5.
In one embodiment, in the method, when preparing the magnesium hydroxide precipitation solution, the alkaline substance added into the decalcification filtrate is ammonia gas, the reaction temperature of the decalcification is controlled to be 10-50 ℃, and the reaction time is controlled to be 1-3 hours.
In one embodiment, in the method, the magnesium removal filtrate is concentrated and granulated, and the method further comprises the following steps:
sending the magnesium-removed filtrate into a preheater for preheating treatment;
sending the magnesium-removed filtrate after the preheating treatment into a heat exchanger, and then sending the filtrate into a forced circulation evaporator for evaporation treatment to obtain slurry;
and separating the slurry after the evaporation treatment by a flash separator, and then sending the slurry into a granulator for granulation treatment.
In one embodiment, preferably, the magnesium-removed filtrate is sent to a preheater for preheating treatment, wherein the preheating treatment temperature is controlled between 105 and 115 ℃ and the preheating time is 5 to 15 seconds.
In one embodiment, preferably, the evaporation treatment temperature is controlled between 140 and 165 ℃; the granulating temperature is controlled between 100 and 120 ℃.
In one embodiment, the method further comprises the following treatment steps when water is added to the magnesium hydroxide filter cake for washing:
adding water into the washed magnesium hydroxide filter cake to perform re-slurry treatment to obtain re-slurry liquid; the temperature of the reslurry process is 40-80 ℃ and the reslurry time is 0.5-1.5 hours;
and filtering and washing the repulped liquid to obtain a magnesium hydroxide filter cake, and drying and crushing the magnesium hydroxide filter cake to obtain magnesium hydroxide.
In one embodiment, in the method, the calcium sulfate filter cake is washed twice; washing the calcium sulfate filter cake after adding water for the first time to obtain a washing solution containing nitrate, and sending the washing solution into the potassium sulfate solution preparation container for preparing the potassium sulfate solution; after the second water addition of the calcium sulfate filter cake for water washing, a nitrate-containing secondary washing solution and the calcium sulfate are obtained, and the secondary washing solution is used as a first water washing liquid of the next batch of calcium sulfate filter cake.
In the method for preparing calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate from the calcium-magnesium-containing leaching solution, a potassium sulfate solution is adopted to react with a calcium magnesium ammonium nitrate concentrated solution, then an alkaline substance is added to perform neutralization reaction to obtain a calcium sulfate solution, and the calcium sulfate solution is filtered to obtain decalcified filtrate and calcium sulfate; adding alkaline substances into the decalcification filtrate to obtain magnesium hydroxide precipitation liquid, and filtering to obtain a decalcification filtrate and magnesium hydroxide; calcining the magnesium hydroxide to obtain magnesium oxide; and (5) continuously concentrating and granulating the magnesium-removed filtrate to obtain potassium nitrate calcium magnesium.
The calcium and magnesium compounds prepared by the method are respectively calcium sulfate, magnesium oxide and potassium nitrate calcium and magnesium, so that the separation of calcium and magnesium ions is realized, the added value of potassium is improved, the preparation process flow is simple, the cost is low, the conversion rate is high, and the quality is stable and reliable; the produced potassium nitrate, calcium and magnesium are easy to be absorbed by fruit trees in agriculture and forestry, and the application range is greatly widened.
Drawings
FIG. 1 is a flow chart of a process for preparing magnesium-containing calcium carbonate from a calcium-magnesium-containing leaching solution in the prior art;
FIG. 2 is a flow chart of the process for preparing calcium sulfate, magnesium oxide and potassium nitrate, calcium and magnesium from the leaching solution containing calcium and magnesium according to the present invention;
FIG. 3 shows the steps of preparing calcium sulfate, magnesium oxide and potassium nitrate, calcium and magnesium from the leaching solution containing calcium and magnesium according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 2, the method for preparing calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate from the calcium-magnesium-containing leaching solution provided by the invention has the following implementation principle:
in the method for preparing calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate by adopting the calcium-magnesium leaching solution, a potassium sulfate solution is adopted to react with an ammonium calcium magnesium nitrate concentrated solution, then an alkaline substance is added to perform neutralization reaction to obtain a calcium sulfate slurry, and the calcium sulfate slurry is filtered to obtain decalcified filtrate and calcium sulfate; adding alkaline substances into the decalcified filtrate to obtain magnesium hydroxide precipitation liquid, and filtering to obtain a decalcified filtrate and a magnesium hydroxide filter cake; and (5) continuously concentrating and granulating the magnesium-removed filtrate to obtain potassium nitrate calcium magnesium. And (3) re-sizing, washing and drying the magnesium hydroxide filter cake to obtain a magnesium hydroxide product, and calcining the magnesium hydroxide product at a high temperature to obtain magnesium oxide.
The preparation scheme of the production process of the present invention is specifically described below.
As shown in fig. 3, the method for preparing calcium sulfate, magnesium hydroxide and potassium calcium magnesium nitrate from the calcium-magnesium-containing leaching solution provided by the invention comprises the following steps:
s1, adding a potassium sulfate solution into a reaction tank containing a calcium magnesium ammonium nitrate concentrated solution, fully reacting, adding calcium hydroxide powder for neutralization reaction, adding an alkaline substance for neutralization reaction, and controlling the slurry to be alkalescent to obtain a calcium sulfate slurry.
In this step, potassium sulfate (K) 2 SO 4 ) Solution: washing the previous batch of calcium sulfate filter cake for the first timeThe primary washing solution obtained is pumped into a potassium sulfate dissolving tank, potassium sulfate is calculated and measured, and then is conveyed into the dissolving tank through a bucket elevator, and is stirred and dissolved by a stirrer, and then is conveyed into a reaction tank in a decalcification working section, and is mixed with calcium magnesium ammonium nitrate (Ca (NO) 3 ) 2 ﹒Mg(NO 3 ) 2 ﹒xH 2 O﹒NH 4 NO 3 ) The concentrated solution is reacted at 20-110 deg.c for 3-6 hr, preferably at 60 deg.c for 5 hr. The corresponding chemical reaction process is as follows:
2K 2 SO 4 +Ca(NO 3 ) 2 ﹒Mg(NO 3 ) 2 ﹒xH 2 O﹒NH 4 NO 3 →CaSO 4 ↓+4KNO 3 +
Mg(NO 3 ) 2 ﹒xH 2 O+NH 4 NO 3
at this time, calcium sulfate (CaSO) 4 ) Are compounds that are slightly soluble in water, appear as precipitates; thus, the reaction system obtained after the reaction is a slurry.
After decalcification reaction, adding alkaline substances into a reaction system to perform neutralization reaction; wherein the alkaline substance is calcium hydroxide or ammonia water, and the slurry is controlled to be alkalescent, namely the pH value is 6.5-7.5; in one embodiment, the alkaline material is preferably calcium hydroxide, and the pH of the slurry is 7.0.
In addition, in the step, the ammonium nitrate calcium magnesium concentrate is used as a reaction raw material and is prepared by the following steps:
firstly, taking medium-low grade phosphate ores as raw materials, and sequentially crushing the medium-low grade phosphate ores by a crusher, namely crushing the medium-low grade phosphate ores into ore particles with the particle size not more than 4.5 mm; the phosphorite is selected mainly because the phosphorite contains a certain amount of calcium and magnesium elements, and can be optimized by a corresponding process and used for preparing the compound fertilizer containing calcium and magnesium ions;
secondly, sending crushed stone into a calcining kiln, calcining for 1.5 to 4 hours at 900 to 1100 ℃, and then cooling to obtain calcined ore;
secondly, carrying out wet ball milling on the calcined ore until the particle size is not more than 1.0mm, and obtaining phosphorus ore pulp;
subsequently, the phosphorus ore pulp is sent to a leaching tank, ammonium nitrate salt is added into the leaching tank for reaction, leaching treatment is carried out, and leaching liquid is obtained; wherein the leaching temperature is 75-90 ℃, the reaction time is 1.5-5 h, and the reaction pH is controlled between 4.0-6.5; in other embodiments, ammonium nitrate salts may also be used as readily water soluble nitrate, ammonium salt solutions;
then, the obtained leaching slurry is sent to a filter press for filter pressing treatment, filtrate discharged by the filter press is decalcified magnesium leaching solution, and filter cakes in the filter press are discharged by the filter press after being washed by adding water and air-dried, so as to obtain filter cakes; at the moment, the filter cake discharged by the filter press is the low-magnesium phosphate concentrate; wherein, the low-magnesium phosphate concentrate contains P according to the mass percent 2 O 5 More than or equal to 34.5 percent and MgO less than or equal to 0.85 percent;
and finally, pumping the decalcified magnesium leaching solution to a two-effect countercurrent evaporation device for concentration treatment to obtain calcium magnesium ammonium nitrate concentrated solution with the mass percentage concentration of more than or equal to 25%. Of course, if nitrate solution is adopted in leaching, calcium magnesium nitrate concentrate is obtained at the moment; if an ammonium salt solution, such as an ammonium chloride solution, is used in leaching, then a concentrated solution of ammonium, calcium and magnesium hydrochloride is obtained.
S2, filtering and decalcifying the calcium sulfate slurry to obtain decalcified filtrate and a calcium sulfate filter cake.
Pumping the calcium sulfate slurry into a filter for filtering treatment to obtain decalcified filtrate and a calcium sulfate filter cake; and the decalcification filtrate and the calcium sulfate filter cake are correspondingly treated by two paths of process flows; the treatment of the filtrate is transferred to step S3; and (3) adding water into the calcium sulfate filter cake for twice washing, obtaining the calcium sulfate filter cake after washing, and obtaining a calcium sulfate product after drying and crushing treatment.
S3, adding alkaline substances into the decalcified filtrate to perform a magnesium removal reaction after filtering treatment, and obtaining magnesium hydroxide precipitation liquid after the reaction;
in the step, alkaline substances are added into decalcification filtrate to carry out magnesium removal reaction, and magnesium hydroxide precipitation liquid is prepared. Wherein the alkaline substance is one or more of ammonia gas, sodium hydroxide, potassium hydroxide and the like; in the embodiment, ammonia gas is selected, so that the operation is convenient, the conveying cost is low, and the like. Ammonia gas is directly introduced into decalcification filtrate, and the reaction is carried out for 1 to 3 hours at the temperature of 10 to 50 ℃.
S4, filtering the magnesium hydroxide precipitation solution to obtain a magnesium removal filtrate and a magnesium hydroxide filter cake; concentrating and granulating the magnesium-removed filtrate to obtain potassium nitrate calcium magnesium.
In the step, the magnesium removal filtrate is concentrated and granulated,
the method is realized by the following steps:
firstly, feeding the magnesium-removed filtrate into a preheater for preheating treatment, wherein the preheating treatment temperature is controlled to be 105-115 ℃ and the preheating time is 5-15 s;
then, sending the magnesium-removed filtrate after the preheating treatment into a heat exchanger, sending the magnesium-removed filtrate after the heat exchange into a forced circulation evaporator, and evaporating the magnesium-removed filtrate at the temperature of 140-165 ℃ to remove part of water to obtain slurry; wherein, condensate generated by concentrating the magnesium-removed filtrate can be used for washing the filter after being collected;
then, separating the slurry obtained after evaporation treatment by a flash separator, and sending the slurry into a granulator for granulation treatment; the magnesium-removed concentrated solution is subjected to heat exchange with the feed liquid to be evaporated through a heat exchanger, the temperature of the magnesium-removed concentrated solution is reduced to 100-120 ℃ which is the optimal temperature for granulation, and the magnesium-removed concentrated solution is sent to a granulator for granulation to obtain granular substances;
and finally, conveying the granular substances into cooling equipment for cooling treatment, and conveying the cooled granular substances into a sieving machine with the sieving mesh number or the pore size of 1.0-4.0mm for sieving treatment to obtain potassium nitrate calcium magnesium.
S5, adding water into the magnesium hydroxide filter cake to wash to obtain magnesium hydroxide, and drying and calcining to obtain magnesium oxide.
In the step, when water is added into the magnesium hydroxide filter cake for washing, the method further comprises the following treatment steps:
adding water into the washed magnesium hydroxide filter cake to perform re-slurry treatment to obtain re-slurry liquid; the temperature of the reslurry process is 40-80 ℃ and the reslurry time is 0.5-1.5 hours;
filtering and washing the repulped liquid to obtain a magnesium hydroxide filter cake, and drying and crushing the magnesium hydroxide filter cake to obtain magnesium hydroxide; (wherein, during the drying treatment, the temperature of the drying air inlet is 200-240 ℃, the temperature of the drying air outlet is 115-140 ℃, the time is 0.15-1h, the ambient atmosphere is normal temperature, the equipment is a QGS-5 powerful crushing dryer, the size of the crushed particles is less than 10 mu m during the crushing treatment, and the like.
Further, the magnesium hydroxide is calcined (wherein the calcining temperature is 700 ℃, the ambient temperature and the normal temperature are both used for 0.5 to 1.5 hours), and the magnesium oxide is obtained. The specific chemical reaction is as follows:
Mg(OH) 2 →MgO+H 2 O
s6, after filtering and decalcification treatment, adding water into the obtained calcium sulfate filter cake to wash, and obtaining a solution containing calcium ions and calcium sulfate.
The calcium sulfate filter cake was washed twice. The calcium sulfate filter cake placed on the filter is washed after the first water addition to obtain a washing solution containing nitrate, and the washing solution is conveyed to a potassium sulfate solution preparation container for preparing a potassium sulfate solution, and the potassium sulfate solution is used as a reaction raw material for preparing calcium carbonate and potassium nitrate/potassium nitrate calcium magnesium in the next batch. When the calcium sulfate filter cake is washed by water for the second time, a nitrate-containing secondary washing solution and calcium sulfate are obtained, and the secondary washing solution is used as a primary washing liquid of the next batch of calcium sulfate filter cake; by the operation, nitrate can be utilized as much as possible, so that nitrate loss in the manufacturing process is reduced, and a high-quality calcium sulfate powder material can be obtained.
It is to be understood that the foregoing description of the preferred embodiments of the invention is not to be considered as limiting the scope of the invention, which is defined by the appended claims.
Claims (7)
1. The method for preparing calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate from calcium-magnesium-containing leaching solution is characterized by comprising the following steps:
adding a potassium sulfate solution and a calcium magnesium ammonium nitrate concentrated solution into a reaction tank simultaneously for decalcification reaction, adding an alkaline substance for neutralization reaction after full reaction to obtain a calcium sulfate slurry, wherein when the potassium sulfate solution reacts with the calcium magnesium ammonium nitrate concentrated solution, the reaction temperature is 20-110 ℃, the reaction time is 3-6 hours, and the alkaline substance is calcium hydroxide or ammonia water;
filtering the calcium sulfate slurry to obtain decalcified filtrate and a calcium sulfate filter cake;
adding alkaline substances into the decalcification filtrate to perform a magnesium removal reaction to prepare magnesium hydroxide precipitation liquid;
filtering the magnesium hydroxide precipitation liquid to obtain magnesium removal filtrate and a magnesium hydroxide filter cake; concentrating and granulating the magnesium-removed filtrate to obtain potassium nitrate calcium magnesium;
adding water into the magnesium hydroxide filter cake to wash to obtain magnesium hydroxide, and drying and calcining the magnesium hydroxide to obtain magnesium oxide;
adding water into the calcium sulfate filter cake for washing to obtain calcium sulfate;
the times of washing the calcium sulfate filter cake are two times; washing the calcium sulfate filter cake after adding water for the first time to obtain a washing solution containing nitrate, and sending the washing solution into the potassium sulfate solution preparation container for preparing the potassium sulfate solution; after the second water addition of the calcium sulfate filter cake for water washing, a nitrate-containing secondary washing solution and the calcium sulfate are obtained, and the secondary washing solution is used as a first water washing liquid of the next batch of calcium sulfate filter cake.
2. The method according to claim 1, characterized in that the calcium magnesium ammonium nitrate concentrate is obtained by the following steps:
taking medium-low grade phosphorite as a raw material, sequentially carrying out crushing, calcining, digestion, leaching, filter pressing and separating procedures, and then discharging decalcification magnesium leaching solution and low-magnesium phosphate concentrate from a filter press; wherein, according to the mass percent: p (P) 2 O 5 ≥34.5％、MgO≤0.85％；In the leaching treatment process, ammonium nitrate solution is required to be added;
and pumping the decalcified magnesium leaching solution to a two-effect countercurrent evaporation device for concentration treatment to obtain the calcium magnesium ammonium nitrate concentrated solution.
3. The method according to claim 1, wherein the alkaline substance added to the decalcification filtrate is ammonia gas, the reaction temperature of the decalcification is controlled between 10 and 50 ℃, and the reaction time is controlled between 1 and 3 hours when the magnesium hydroxide precipitation solution is prepared.
4. The method according to claim 1, wherein the demagging filtrate is subjected to concentration granulation treatment, further comprising the steps of:
sending the magnesium-removed filtrate into a preheater for preheating treatment;
sending the magnesium-removed filtrate after the preheating treatment into a heat exchanger, and then sending the filtrate into a forced circulation evaporator for evaporation treatment to obtain slurry;
and separating the slurry after the evaporation treatment by a flash separator, and then sending the slurry into a granulator for granulation treatment.
5. The method according to claim 4, wherein the magnesium-removed filtrate is fed into a preheater for preheating treatment, the preheating treatment temperature is controlled to be 105-115 ℃ and the preheating time is controlled to be 5-15 s.
6. The method according to claim 5, wherein the evaporation treatment temperature is controlled between 140 and 165 ℃; the granulating temperature is controlled between 100 and 120 ℃.
7. The method according to claim 1, wherein when the magnesium hydroxide filter cake is washed with water, the method further comprises the following steps:
adding water into the washed magnesium hydroxide filter cake to perform re-slurry treatment to obtain re-slurry liquid; the temperature of the reslurry process is 40-80 ℃ and the reslurry time is 0.5-1.5 hours;
and filtering and washing the repulped liquid to obtain a magnesium hydroxide filter cake, and drying and crushing the magnesium hydroxide filter cake to obtain magnesium hydroxide.
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