CN113390753B - Method for testing content of combustible in limestone wet desulphurization slurry solid - Google Patents
Method for testing content of combustible in limestone wet desulphurization slurry solid Download PDFInfo
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Abstract
The invention discloses a method for testing combustible content in limestone wet desulphurization slurry solid, wherein the method comprises the following steps: removing unreacted calcium carbonate and calcium sulfite in the absorption tower slurry to obtain treated absorption tower slurry; filtering the treated slurry of the absorption tower based on medium-speed quantitative filter paper to obtain residual solids in the treated slurry of the absorption tower; putting the residual solid into an oven, and drying to constant weight; taking the residual solid dried to constant weight, and analyzing the content of the crystal water in the residual solid to obtain the mass content percentage of the crystal water in the residual solid; putting the dried residual solid with constant weight into a porcelain crucible for ignition until constant weight treatment; and performing calculation processing on the combustible content to obtain a calculation result. In the embodiment of the invention, the combustible content in the limestone wet desulphurization slurry solid can be rapidly measured, and the accuracy of the measurement result is high.
Description
Technical Field
The invention relates to the technical field of limestone wet desulphurization, in particular to a method for testing combustible content in limestone wet desulphurization slurry solid.
Background
In the operation process of a limestone-gypsum wet flue gas desulfurization system, slurry foaming overflow of an absorption tower becomes a relatively common phenomenon, and the stable operation of the desulfurization system is seriously influenced. The results of the study show that one of the reasons for the foaming overflow of the slurry in the absorption tower is that the slurry solid contains more oleophilic and hydrophobic carbon and oil particles with lower density than the slurry. And these carbon and oil particles come from the unburned and clean coal (mainly carbon particles) and combustion oil of the boiler. The results of the study also show that when the carbon and oil particle content of the slurry solids is greater than 0.5%, the possibility of foaming overflow of the absorber slurry is high. Therefore, the method has important significance in timely taking precautionary measures for operating personnel of a thermal power plant and ensuring safe operation of a desulfurization system and standard SO2 emission concentration by analyzing the contents of carbon and oil particles in the solid slurry to serve as an index for researching and judging whether the slurry foam of the absorption tower has the tendency of overflowing or not. Since only carbon and oil particles in the slurry solids are normally combustible and can be completely combusted at 850 ℃, the content of carbon and oil particles in the slurry solids can be analyzed by determining the content of combustible in the slurry solids. Since unreacted calcium carbonate in the slurry solid and crystal water in calcium sulfite and calcium sulfate are also decomposed at 850 ℃, the content of combustible materials in the slurry solid cannot be truly reflected by measuring the loss on ignition of the slurry solid at 850 ℃.
At present, no method for analyzing the content of combustible substances in solid in slurry of a limestone-gypsum wet flue gas desulfurization system of a thermal power plant exists. Therefore, it is urgently needed to develop a test method which is simple to operate, high in accuracy and rapid in determination of the combustible content in the solid in the slurry.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the method for testing the combustible content in the limestone wet desulphurization slurry solid, so that the combustible content in the limestone wet desulphurization slurry solid can be quickly tested, and the accuracy of the test result is high.
In order to solve the technical problem, an embodiment of the present invention provides a method for testing combustible content in limestone wet desulphurization slurry solids, including:
eliminating unreacted calcium carbonate and calcium sulfite in the slurry of the absorption tower to obtain treated slurry of the absorption tower;
filtering the treated slurry of the absorption tower based on medium-speed quantitative filter paper to obtain residual solids in the treated slurry of the absorption tower;
putting the residual solid into an oven, and drying at 100 +/-2 ℃ to constant weight;
taking 1g +/-0.1 mg of the dried residual solid with constant weight to analyze the content of the crystal water in the residual solid to obtain the mass content percentage of the crystal water in the residual solid;
placing 1g +/-0.1 mg of the dried residual solid with constant weight in a porcelain crucible for burning until the constant weight is achieved, and obtaining the weight of the burned residual solid;
and calculating the combustible content based on the mass content percentage of the crystal water in the residual solid and the weight of the residual solid after ignition to obtain a calculation result.
Optionally, the removing unreacted calcium carbonate and calcium sulfite in the slurry of the absorption tower to obtain a treated slurry of the absorption tower includes:
obtaining slurry of a sampling absorption tower, and adding H with a first preset concentration according to a first proportion 2 O 2 Performing calcium sulfite removal treatment to obtain first mixed slurry;
and adding hydrochloric acid with a second preset concentration into the first mixed slurry according to a second proportion to perform calcium carbonate removal treatment, thereby obtaining treated slurry of the absorption tower.
Optionally, the slurry of the sampling absorption tower is obtained, and H with a first preset concentration is added according to a first proportion 2 O 2 Performing calcium sulfite removal treatment to obtain a first mixed slurry, comprising:
sampling and removing from the absorption tower by using a conical flask to obtain sampled absorption tower slurry;
adding 30% H into the slurry of the sampling absorption tower according to a first ratio of 50:1 with the slurry of the sampling absorption tower 2 O 2 And shaking up to remove the calcium sulfite to obtain a first mixed slurry.
Optionally, the step of adding hydrochloric acid with a second preset concentration into the first mixed slurry according to a second ratio to perform calcium carbonate removal treatment to obtain treated slurry of the absorption tower includes:
adding 35% hydrochloric acid into the first mixed slurry according to the proportion of 10:1 of the first mixed slurry and the slurry of the sampling absorption tower, shaking up, heating to boil, cooling and standing for 30min, and mixing with the slurry of the sampling absorption tower to obtain the treated slurry of the absorption tower.
Optionally, the step of analyzing the content of the crystal water in the residual solid by taking 1g ± 0.1mg of the residual solid dried to a constant weight to obtain the percentage of the mass content of the crystal water in the residual solid comprises:
taking 1g +/-0.1 mg of the residual solid dried to constant weight, and carrying out analysis treatment on the content of the crystal water in the residual solid according to determination of crystal water and drying subtraction method in Gypsum chemical analysis method (GB/T5484-2012) to obtain the mass content percentage of the crystal water in the residual solid.
Optionally, the method for obtaining the weight of the burned residual solid includes the steps of placing 1g ± 0.1mg of the residual solid dried to the constant weight in a porcelain crucible for burning to the constant weight, and obtaining the weight of the burned residual solid, including:
placing 1g +/-0.1 mg of residual solid dried to constant weight in a porcelain crucible, obliquely placing a pot cover on the porcelain crucible, and placing the pot cover in a high-temperature furnace;
gradually raising the temperature from low temperature in the high-temperature furnace, and burning for 1 hour at 850 ℃ or reaching constant weight;
and taking out the porcelain crucible, placing the porcelain crucible in a drier, cooling to room temperature, and weighing to obtain the weight of the residual solid after firing.
Optionally, the calculation formula for performing the combustible content calculation processing based on the mass content percentage of the crystal water in the residual solid and the weight of the residual solid after ignition is as follows:
wherein X represents the combustible content proportion in the slurry of the absorption tower; w 1 Residual solids, expressed as oven dried to constant weight; x 1 Represents the percentage of the mass content of water of crystallization in the residual solid; w 2 Represents the weight of the solid remaining after the firing.
In the embodiment of the invention, the analysis and test method is simple, a special test device is not needed, the conventional experiment instrument of the thermal power plant can be used for testing, the result is accurate, the engineering practical situation is met, one of the reasons for analyzing and judging the slurry foaming overflow of the flue gas desulfurization absorption tower of the thermal power plant can be used, and the guarantee is provided for ensuring the normal operation of the desulfurization system.
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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a method of testing the combustible content of limestone wet flue gas desulfurization slurry solids in an example of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, fig. 1 shows a method for measuring combustible content in limestone wet desulfurization slurry solids in an embodiment of the present invention.
As shown in fig. 1, a method for testing combustible content in limestone wet desulfurization slurry solids comprises the following steps:
s11: eliminating unreacted calcium carbonate and calcium sulfite in the slurry of the absorption tower to obtain treated slurry of the absorption tower;
in the specific implementation process of the present invention, the removing treatment of the unreacted calcium carbonate and calcium sulfite in the slurry of the absorption tower to obtain the treated slurry of the absorption tower comprises: obtaining a sampling absorption tower slurry, and adding H with a first preset concentration according to a first proportion 2 O 2 Performing calcium sulfite removal treatment to obtain first mixed slurry; adding hydrochloric acid with a second preset concentration into the first mixed slurry according to a second proportion to remove calcium carbonate to obtain treated absorptionAnd (5) collecting tower slurry.
Further, the slurry of the sampling absorption tower is obtained, and H with a first preset concentration is added according to a first proportion 2 O 2 Performing calcium sulfite removal treatment to obtain a first mixed slurry, comprising: sampling and removing from the absorption tower by using a conical flask to obtain sampled absorption tower slurry; adding 30% H into the slurry of the sampling absorption tower according to a first ratio of 50:1 with the slurry of the sampling absorption tower 2 O 2 And shaking up to remove the calcium sulfite to obtain a first mixed slurry.
Further, the step of adding hydrochloric acid with a second preset concentration into the first mixed slurry according to a second proportion to perform calcium carbonate removal treatment to obtain treated slurry of the absorption tower comprises the following steps: adding 35% hydrochloric acid into the first mixed slurry according to the proportion of 10:1 of the first mixed slurry and the slurry of the sampling absorption tower, shaking up, heating to boil, cooling and standing for 30min, and mixing with the slurry of the sampling absorption tower to obtain the treated slurry of the absorption tower.
Specifically, 50mL of slurry sample is taken from a slurry sampling port of an absorption tower by using a conical flask, 1mL of H2O2 (30%) is added, and the mixture is shaken up to oxidize calcium sulfite in the slurry into calcium sulfate; adding 5ml hydrochloric acid (35% concentration), shaking, reacting calcium carbonate in the slurry completely to generate calcium chloride, heating to boil on an electric furnace if necessary, cooling, and standing for 30min; thus obtaining the treated slurry of the absorption tower.
S12: filtering the treated slurry of the absorption tower based on medium-speed quantitative filter paper to obtain residual solids in the treated slurry of the absorption tower;
in the specific implementation process of the invention, the treated slurry of the absorption tower is filtered by medium-speed quantitative filter paper, so that the residual solid in the treated slurry of the absorption tower can be obtained.
S13: putting the residual solid into an oven, and drying at 100 +/-2 ℃ to constant weight;
in the specific implementation process of the invention, the residual solid remained on the filter paper is put into an oven and dried to constant weight by using the oven at 100 +/-2 DEG C
S14: taking 1g +/-0.1 mg of the residual solid dried to constant weight for analysis treatment of the content of the crystal water in the residual solid to obtain the mass content percentage of the crystal water in the residual solid;
in the specific implementation process of the invention, the step of analyzing the content of the crystal water in the residual solid by taking 1g +/-0.1 mg of the residual solid dried to constant weight to obtain the mass content percentage of the crystal water in the residual solid comprises the following steps: taking 1g +/-0.1 mg of the residual solid dried to constant weight, and carrying out analysis treatment on the content of the crystal water in the residual solid according to determination of crystal water and drying subtraction method in Gypsum chemical analysis method (GB/T5484-2012) to obtain the mass content percentage of the crystal water in the residual solid.
Specifically, 1g +/-0.1 mg of residual solid dried to constant weight is placed in a 230 ℃ oven to be dried to constant weight, and the content of the crystal water of the sample is obtained through analysis, wherein the analysis is carried out according to the determination of the crystal water and the drying subtraction method in the gypsum chemical analysis method (GB/T5484-2012), and the mass content percentage of the crystal water in the residual solid can be obtained.
S15: putting 1g +/-0.1 mg of the residual solid dried to the constant weight in a porcelain crucible for burning to the constant weight to obtain the weight of the residual solid after burning;
in the specific implementation process of the invention, the step of putting 1g +/-0.1 mg of the residual solid dried to the constant weight into a porcelain crucible for burning to the constant weight to obtain the weight of the burned residual solid comprises the following steps: taking 1g +/-0.1 mg of residual solid dried to constant weight, placing the residual solid in a porcelain crucible, obliquely placing a pot cover on the porcelain crucible, and placing the pot cover in a high-temperature furnace; gradually raising the temperature from low temperature in the high-temperature furnace, and burning for 1 hour at 850 ℃ or reaching constant weight; and taking out the porcelain crucible, placing the porcelain crucible in a drier, cooling to room temperature, and weighing to obtain the weight of the residual solid after firing.
Specifically, 1g +/-0.1 mg (W1 (g)) of the dried solid sample is placed in a fired constant-weight porcelain crucible, a cover is obliquely placed on the crucible, the crucible is placed in a high-temperature furnace, the temperature is gradually increased from low temperature, the solid sample is fired for 1 hour at 850 ℃ or reaches constant weight, the crucible is taken out and placed in a dryer to be cooled to room temperature, and the weight of the fired sample is weighed to obtain the weight of the fired residual solid.
S16: and calculating the combustible content based on the mass content percentage of the crystal water in the residual solid and the weight of the residual solid after ignition to obtain a calculation result.
In the specific implementation process of the invention, the calculation formula for calculating and processing the combustible content based on the mass content percentage of the crystal water in the residual solid and the weight of the residual solid after ignition is as follows:
wherein X represents the combustible content proportion in the slurry of the absorption tower; w 1 Residual solids dried to constant weight; x 1 Represents the percentage of the mass content of water of crystallization in the residual solid; w is a group of 2 The weight of the solid remaining after the calcination is shown.
Specifically, after the related sample data is obtained, the combustible content ratio in the slurry of the absorption tower can be calculated by using the calculation formula.
The combustibles in the slurry in the absorption tower are usually coal (mainly carbon particles) and combustion-supporting oil which are not completely combusted in the boiler, and the carbon particles and the combustion-supporting oil can be completely combusted at 850 ℃, so that the combustible content in the slurry solid can be analyzed by analyzing the loss on ignition of the slurry solid at 850 ℃.
Because the slurry in the absorption tower also contains calcium sulfite, organic matters, unreacted calcium carbonate and hydroxide, the substances are decomposed or burnt at the same time when being burnt at 850 ℃; in addition, the crystal water in calcium sulfate dihydrate (CaSO4.2H2O), which is the main component of the slurry solid, also loses crystal water upon ignition at 850 ℃. The effect of these factors must be eliminated when analyzing the combustible content of the slurry solids by analyzing the loss on ignition of the slurry solids at 850 ℃.
Elimination of calcium sulfite and organic matter: the organic matter that may be present is oxidized to water soluble salts by oxidizing calcium sulfite in the absorber slurry with hydrogen peroxide (H2O 2) to calcium sulfate.
Elimination of calcium carbonate and hydroxide: unreacted calcium carbonate and hydroxide in the slurry are reacted with hydrochloric acid (HCl) to form a water-soluble salt.
Elimination of crystal water in calcium sulfate dihydrate (caso4.2h2o): and (3) analyzing by using a testing method of ' determination of crystal water, drying and differential subtraction ' in gypsum chemical analysis method ' (GB/T5484-2012) to obtain the content of the crystal water in the slurry solid, and calculating to obtain the content of combustible substances in the slurry solid of the flue gas desulfurization system after subtracting the content of the crystal water from the loss on ignition.
In the embodiment of the invention, the analysis and test method is simple, a special test device is not needed, the test can be carried out by using a conventional experimental instrument of a thermal power plant, the result is accurate, the engineering practical situation is met, one of the reasons of the foaming and overflowing of the slurry of the flue gas desulfurization absorption tower of the thermal power plant can be analyzed and judged, and the guarantee is provided for ensuring the normal operation of a desulfurization system.
In addition, the second embodiment
Take the test of the combustible content in the solid in the slurry of the absorption tower of the limestone wet flue gas desulfurization system of 670MW unit of a certain power plant in Guangxi as an example.
A670 MW unit of a certain power plant in Guangxi province adopts a limestone wet flue gas desulfurization system, 2 absorption towers operate in series, the 2 absorption towers have 7 spraying layers (corresponding to 7 slurry circulating pumps), the design value of the sulfur content in the coal is 4.89%, the design value of an FGD inlet for treating the SO2 concentration in the flue gas is 11000mg/m < 3 > (standard, dry and O26%), the design value of the treated flue gas is 2135000m < 3 >/h (standard, dry and O26%), and the emission standard of the emission SO2 concentration is allowed to be less than 35mg/m < 3 > (standard, dry and O26%).
Approximately 50mL of the overflowed slurry was taken from the beaker and poured into a 200mL conical flask, which was rinsed clean with water and poured into the conical flask.
Adding 1mL of H2O2 (30 percent) and shaking up, and oxidizing the calcium sulfite in the slurry into calcium sulfate; adding 5ml hydrochloric acid (35% concentration), shaking, reacting calcium carbonate in the slurry completely to generate soluble calcium chloride, and standing for 10min; filtering the slurry by using medium-speed quantitative filter paper, and leaving the solid in the slurry on the filter paper; the slurry solid remaining on the filter paper was transferred to an oven and dried at 100 ℃. + -. 2 ℃ to constant weight.
Analysis of the mass percent of crystal water in the slurry solids: taking 1g +/-0.1 mg of a dried solid sample, and analyzing according to the determination of crystal water and the dry subtraction method in the gypsum chemical analysis method (GB/T5484-2012) to obtain the mass percent of the crystal water in the slurry solid, namely X crystal water =21.56%.
Determination of combustible content: placing 1g +/-0.1 mg (W1 (g)) of the dried solid sample in a fired constant-weight porcelain crucible, placing a cover on the crucible in an inclined manner, placing the crucible in a high-temperature furnace, gradually raising the temperature from low temperature, firing for 1h or reaching constant weight at 850 ℃, taking out the crucible, placing the crucible in a dryer, cooling to room temperature, weighing to obtain the weight W2 of the fired sample, and ending the test, wherein the weight W2 of the fired sample is 0.7775 g.
The combustible content in the slurry solids was calculated to be 0.69% from the above calculation formula.
Since the combustible content in the slurry solids of the absorption tower of the plant is more than 0.5 percent, the slurry foams and overflows.
As can be seen from the test result of the combustible content in the slurry solid of the absorption tower of the 670MW unit flue gas desulfurization system of a certain power plant in Guangxi, the combustible content in the slurry solid reaches 0.69 percent. The foaming of the absorber slurry and overflow to the surface occurs due to the high combustible content in the slurry solids. If the combustible content in the slurry solid is tested in the early stage, precautionary measures are taken in time when the combustible content in the slurry solid is gradually increased, and the slurry can be prevented from foaming and overflowing to the ground to cause pollution and endanger the operation safety of a desulfurization system.
In addition, EXAMPLE III
Taking a limestone wet flue gas desulfurization system adopted by a 2 x 300MW unit of a certain power plant in Guangxi as an example, each absorption tower of the limestone wet flue gas desulfurization system adopted by the 2 x 300MW unit of the certain power plant in Guangxi has 5 spraying layers (corresponding 5 slurry circulating pumps), the design value of the sulfur content in the coal is 2.3%, the design value of an FGD inlet for the concentration of SO2 in the treated flue gas is 5859mg/m3 (standard, dry, O26%), the designed treated flue gas amount is 894009m3/h (standard, dry, O26%), and the concentration of the discharged SO2 is allowed to be less than 35mg/m3 (standard, dry, O26%).
The analysis and test process of the slurry of the absorption tower of the desulfurization system of the set #1 and the set #2 is the same as the step in the second embodiment, the combustible content in the solid of the slurry is 0.91 percent and 1.02 percent respectively, and the analysis result is the same as the actual situation.
Therefore, serious foaming and overflowing of slurry in the absorption tower of the desulfurization system of 3 units in the 2 power plants in Guangxi occur, which is that the peak regulation is frequently carried out on the power plants in the most thermal power plants in Guangxi, and is carried out in the following steps of 0: 00-5: the unit operation load in the 00 period is usually lower than 50% of the rated load, so that oil has to be thrown for combustion supporting, the unburned and complete oil and carbon particle content in the flue gas is high, and the foaming overflow of the slurry in the absorption tower is caused. Therefore, a system for regularly analyzing the combustible content in the slurry solid of the absorption tower every day is established for the 2 power plants, when the combustible content in the slurry solid is more than 0.4%, the absorption tower is timely drained and dehydrated, slurry bubbling and overflowing caused by accumulation of combustible in the slurry solid are prevented, and safe and reliable operation of a desulfurization system is ensured. The overflow event of the 2 power plant absorption tower slurry caused by foaming is reduced by more than 50 percent after the measure is taken.
Relative standard deviation of test method
In order to analyze the relative standard deviation of the test method, overflowed slurry is respectively taken from the same position of 670MW unit of a certain power plant in Guangxi 7 times, wherein the overflowed slurry is respectively a sample 1, a sample 2, a sample 3, a sample 4, a sample 5, a sample 6 and a sample 7, the same steps as 3-8 in the example 1 are carried out, and the analysis results are shown in a table 1.
TABLE 1 relative standard deviation of test methods
From this, the relative standard deviation thereof can be calculated to be 6.72%.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, and the program may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), random Access Memory (RAM), magnetic or optical disks, and the like.
In addition, the above detailed description of the method for testing the combustible content in the limestone wet desulphurization slurry solid provided by the embodiment of the invention is provided, and the principle and the implementation mode of the invention are explained by using the specific example herein, and the description of the above example is only used for helping to understand the method of the invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (3)
1. A method for testing combustible content in limestone wet flue gas desulfurization slurry solids, the method comprising:
eliminating unreacted calcium carbonate and calcium sulfite in the slurry of the absorption tower to obtain treated slurry of the absorption tower;
obtaining slurry of a sampling absorption tower, and adding H with a first preset concentration according to a first proportion 2 O 2 Performing calcium sulfite removal treatment to obtain a first mixed slurry, wherein the first mixed slurry comprises:
sampling and removing from the absorption tower by using a conical flask to obtain sampled absorption tower slurry;
h was added to the sampled absorber slurry at a concentration of 30% in a first ratio to the sampled absorber slurry 50 2 O 2 Shaking up to remove calcium sulfite to obtain a first mixed slurry
Adding hydrochloric acid with a second preset concentration into the first mixed slurry according to a second proportion to perform calcium carbonate removal treatment to obtain treated slurry of the absorption tower, wherein the method comprises the following steps:
adding 35% hydrochloric acid into the first mixed slurry according to the ratio of the first mixed slurry to the sampling absorption tower slurry 10 to shake uniformly, heating to boil after shaking uniformly, cooling and standing for 30min to perform sampling absorption tower slurry, and obtaining treated absorption tower slurry;
filtering the treated slurry of the absorption tower based on medium-speed quantitative filter paper to obtain residual solids in the treated slurry of the absorption tower;
putting the residual solid into an oven, and drying at 100 +/-2 ℃ to constant weight;
taking 1g +/-0.1 mg of the residual solid dried to constant weight for analysis treatment of the content of the crystal water in the residual solid to obtain the mass content percentage of the crystal water in the residual solid;
putting 1g +/-0.1 mg of the residual solid dried to the constant weight in a porcelain crucible for burning to the constant weight to obtain the weight of the residual solid after burning;
calculating the content of combustible materials based on the mass content percentage of crystal water in the residual solid and the weight of the residual solid after firing to obtain a calculation result;
the calculation formula for performing the combustible content calculation processing based on the mass content percentage of the crystal water in the residual solid and the weight of the residual solid after ignition is as follows:
wherein X represents the combustible content proportion in the slurry of the absorption tower;
residual solids dried to constant weight;
represents the percentage of the mass content of water of crystallization in the residual solid;
represents the weight of the solid remaining after the firing.
2. The test method as claimed in claim 1, wherein the step of taking 1g ± 0.1mg of the residual solid dried to constant weight for analysis treatment of the content of the crystal water in the residual solid to obtain the mass content percentage of the crystal water in the residual solid comprises:
taking 1g +/-0.1 mg of the residual solid dried to constant weight, and analyzing and processing the content of the crystal water in the residual solid according to 'determination of the crystal water and drying subtraction' in 'Gypsum chemical analysis method' GB/T5484-2012 to obtain the mass content percentage of the crystal water in the residual solid.
3. The test method according to claim 1, wherein the step of taking 1g ± 0.1mg of the residual solid dried to a constant weight and placing the solid in a porcelain crucible to be burned to the constant weight to obtain the weight of the residual solid after burning comprises the following steps:
placing 1g +/-0.1 mg of residual solid dried to constant weight in a porcelain crucible, obliquely placing a pot cover on the porcelain crucible, and placing the pot cover in a high-temperature furnace;
gradually raising the temperature from low temperature in the high-temperature furnace, and burning for 1 hour at 850 ℃ or reaching constant weight;
and taking out the porcelain crucible, placing the porcelain crucible in a drier, cooling to room temperature, and weighing to obtain the weight of the residual solid after firing.
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