CN107764693B - method for accurately measuring maximum molecular water content of iron ore powder - Google Patents
method for accurately measuring maximum molecular water content of iron ore powder Download PDFInfo
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Abstract
method for accurately measuring the maximum molecular water content of iron ore powder includes such steps as baking the iron ore powder to be measured, classifying, selecting the iron ore powder, immersing each specimen in water, taking out, removing water from its surface, centrifugal dewatering, taking out the specimen, weighing, baking, calculating the maximum molecular water content Ri of the specimen, and calculating the maximum molecular water R of the iron ore powder.
Description
Technical Field
The invention relates to detection methods, and belongs to methods for measuring the maximum molecular water content of iron ore powder.
Background
The quality of the performance of iron ore powder for sintering directly influences the granularity state of the mixture, thereby influencing the air permeability of the sintering process and further influencing the implementation of the sintering process.
At present, the centrifugal dehydration method generally takes samples for detection, parallel samples are taken for ensuring the detection accuracy, the fluctuation takes an average value as the maximum molecular water within an allowable range, however, a large number of tests show that when the centrifugal dehydration method is used for detecting the maximum molecular water, the maximum molecular water detected by the centrifugal dehydration method fluctuates along with the fluctuation of the maximum molecular water of a sampling amount, the difference of the test amounts is larger, the maximum molecular water detected by the detection amount of 12g is 3.66%, the maximum molecular water detected by the detection amount of 40g is 2.82%, the maximum molecular water detected by the detection amount of 40g is larger along with the fluctuation of the maximum molecular water of the sampling amount, the difference of the maximum molecular water detected by the test amounts is larger, the maximum molecular water detected by the detection amount of 12g in the embodiment is smaller, the maximum molecular water detected by the detection amount of 40g is larger along with the fluctuation of the sampling amount, the maximum molecular water detected by the centrifugal dehydration method is larger along with the fluctuation of the detection amount, the difference of the maximum molecular water of the detection amount, the boundary layer is larger, the boundary layer is detected by the centrifugal dehydration effect, the boundary layer is larger the boundary layer, the boundary layer is detected by the centrifugal dehydration effect, the boundary layer is larger the boundary layer, the boundary layer is larger the boundary layer, the boundary layer is the boundary layer, the boundary.
After retrieval:
the Chinese patent publication No. 201210127343.5 discloses a technology named methods for detecting balling property of iron ore concentrates, which indicates that the detection method of the largest molecule water is to soak the iron ore concentrates in water for 2-3 hours, take 30-50 g of soaked iron ore concentrates to dehydrate for 15min under the centrifugal action of 10000r/min and 60mm of rotating radius, then detect the percentage of the residual water in the iron ore concentrates after the centrifugal operation as the largest molecule water of the iron ore concentrates, which is the conventional molecular water detection method used at present, do not consider the influence of the detection amount on the centrifugal dehydration process, the measurement result fluctuates due to the different detection amounts, the Chinese patent publication No. 201220753093.1 discloses technology named instruments for detecting balling property index of the iron ore concentrates, the instrument for detecting the largest molecule water is to place cylindrical metal sleeves in tubular metal sleeves, press iron in the sleeve, the press iron can freely move in the sleeves, the method for detecting the largest molecule water channeling is to place in distilled water which is placed on 20g of distilled samples under the condition of 20-5395 molecules of distilled water, the largest molecule water is placed on the sleeve under the condition of 20-20 g of distilled water, the distilled water is placed under the condition of distilled water, the highest molecular water, the distilled water is placed under the distilled water, the distilled water is placed under the condition of distilled water, the distilled water is placed under the distilled water, the distilled water is placed under the.
Based on the characteristics of a centrifugal dehydration method, the invention provides the method capable of accurately detecting the maximum molecular water content of the iron ore powder through a large number of research and analysis.
Disclosure of Invention
The invention provides methods for accurately measuring the maximum molecular water content of iron ore powder, aiming at the situation that the detection results of the maximum molecular water of the iron ore powder measured by the existing centrifugal method are different due to different detection amounts and different particle sizes.
The core content of the invention is that when the maximum molecular water of the iron ore powder is measured by adopting a centrifugal method, the influence of different sample loading amounts and sizes of ore size fractions on the measurement of the maximum molecular water of the iron ore powder is eliminated, and the correction method for measuring the maximum molecular water of the iron ore powder is extracted aiming at the influence of different sample loading amounts and sizes of the ore size fractions on the measurement of the maximum molecular water of the iron ore powder by adopting the centrifugal method, so that the stability and the accuracy of the measurement of the maximum molecular water of the iron ore powder are ensured.
method for accurately measuring the maximum molecular water content of iron ore powder, comprising the following steps:
1) drying the iron ore powder to be detected at the drying temperature of not less than 100 ℃ for not less than 2 hours, and controlling the water content of the iron ore powder not to exceed 0.001wt% after the iron ore powder is flood-dried;
2) and (3) screening the dried iron ore powder in a particle size grade of: less than 0.5mm, 0.5 to less than 1.0mm, 1.0 to less than 2.0mm, 2.0 to less than 3.15mm, 3.15 to less than 5.0mm, 5.0 to less than 6.3mm, not less than 6.3 mm;
3) selecting iron ore powder of the size fraction to be measured; the number i of the samples is not less than 4, the samples are split and packaged, and the sampling quantity m of each sample is selected in a range of 10-100 g in an unequal manner; the weight of the weighed sample is expressed by mi; i = 1-n;
4) soaking each iron ore powder sample in water for not less than 12 hours, and burying the iron ore powder sample in the water;
5) fishing out the soaked iron ore powder sample and removing water on the surface of the iron ore powder sample; then, carrying out centrifugal dehydration on each iron ore powder sample, and controlling the rotating speed of a centrifugal machine to be not less than 10000r/min, wherein the centrifugal dehydration time is not less than 10 minutes;
6) taking out and weighing the dehydrated iron ore powder sample, and using mi as the weighed iron ore powder sample amountFront sideIt is noted that the weighed iron ore powder sample amount is not less than 70wt% of the charged amount;
7) to the weighed iron ore powder sample miFront sideDrying at a temperature not lower than 100 ℃ for not less than 2 hours, and controlling the water content of the mineral powder not to exceed 0.001wt% after flood drying; weighing the sample amount of the dried iron ore powder, wherein the data is miRear endRepresents;
8) calculating the content Ri of the maximum molecular water of the ith sample: the weighed mi is mixedFront sideAnd miRear endRespectively substituted into the following formulas to calculate
Ri=100*(miFront side-miRear end)/ miFront side%
In the formula: ri-represents the content of the maximum molecular water of the ith iron ore powder sample, wherein i = 1-n;
mifront sideThe number of the ith iron ore powder sample before drying is represented as g, wherein i = 1-n;
mirear endThe number of the ith iron ore powder samples after drying is represented by g, wherein i = 1-n;
9) calculating the maximum molecular water R of the iron ore powder: first, the curve equation is determined: y is the Ri value calculated in the step 8), and mi weighed in the step 6)Front sideX and inputting the data into a data analysis tool to determine a fitting equation until the fitting variance value is not less than 0.95The equation is a curve equation to be determined; and substituting x =50g into the determined curve equation, and obtaining the calculated y value as the maximum molecular water R.
The invention sieves the dried iron ore powder in a particle size grade, and the particle size grade is as follows: less than 0.5mm, 0.5 to less than 1.0mm, 1.0 to less than 2.0mm, 2.0 to less than 3.15mm, 3.15 to less than 5.0mm, 5.0 to less than 6.3mm, not less than 6.3 mm; the influence of the size fraction on the molecular water is eliminated so as to ensure the accuracy of the molecular water measurement and the definition of the object
The method adopts a fitting curve which takes the weight of a detected sample as a factor and makes the maximum molecular water content, and is characterized in that the fitting curve can weaken the influence of a diffusion layer in the dehydration process of a centrifugal machine, reduce the fluctuation in the detection process and ensure that the stability of a detection result is better.
Compared with the prior art, the invention has the following characteristics:
1) the iron ore powder is classified to detect the molecular water, so that the influence of the particle size on the molecular water can be eliminated, and the accuracy of the molecular water measurement and the definition of an object are ensured;
2) the weight of the detected sample is used as a factor to make a fitting curve of the maximum molecular water content, so that the influence of a diffusion layer in the dehydration process of the centrifugal machine is weakened, the fluctuation in the detection process is reduced, and the detection result is more stable.
3) The method is simple and easy to implement, has strong operability, and can stabilize the fluctuation of the maximum molecular water within 5 percent.
Detailed Description
The present invention is described in detail below:
example 1
method for accurately measuring the maximum molecular water content of iron ore powder, comprising the following steps:
1) drying the iron ore powder to be detected at the temperature of 103 ℃ for 2.5 h;
2) and (3) screening the dried iron ore powder in a particle size grade of: less than 0.5mm, 0.5 to less than 1.0mm, 1.0 to less than 2.0mm, 2.0 to less than 3.15mm, 3.15 to less than 5.0mm, 5.0 to less than 6.3mm, not less than 6.3 mm;
3) selecting iron ore powder with the size fraction of less than 0.5 mm; the number i of the samples is 6, the samples are split and packaged, and the sampling amount of each sample is selected in a range of 10-100 g in an unequal manner; the weight of the weighed sample is expressed by mi and is respectively m1=12g、m2=16g、m3=20g、m4=24g、m5=32g、m6=40g；i=1~6；
4) To m1、m2、m3、m4、m5、m6Soaking each iron ore powder sample in water for 12.5 hours, and burying the iron ore powder sample in the water;
5) the soaked iron ore powder sample m1、m2、m3、m4、m5、m6Respectively fishing and removing the water on the surface; then, each iron ore powder sample is subjected to centrifugal dehydration, the rotating speed of a centrifugal machine is controlled to be 11000r/min, and the centrifugal dehydration time is 15 minutes;
6) the dehydrated iron ore powder sample m1、m2、m3、m4、m5、m6Respectively taking out and weighing, wherein the weighed iron ore powder sample amount is m1 front、m2 front、m3 front、m4 front、m5 front、m6 frontDenotes that the data is m1 front=9.28 g、m2 front=12.99 g、m3 front=15.17 g、m4 front=18.02 g、m5 front=24.61 g、m6 front=30.57 g, the weighed iron ore powder samples are more than 75wt% of the charged amount;
7) for the weighed iron ore powder sample m1 front、m2 front、m3 front、m4 front、m5 front、m6 frontDrying at 106 ℃ for 3 h; weighing the sample amount of the dried iron ore powder, wherein the data is m1 after= 8.94 g、m2 after=12.57 g、m3 after=14.7 g、m4 after= 17.49 g、mAfter 5=23.92 g、m6 back= 29.71 g；
8) Calculating the content Ri of the maximum molecular water of the ith sample: m is weighed out1 front、m2 front、m3 front、m4 front、m5 front、m6 frontAnd m1 after、m2 after、m3 after、m4 after、mAfter 5、m6 backRespectively substituting the following formulas to respectively calculate R1~ R6Value of
Ri=100*(miFront side-miRear end)/ miFront side%
Calculated, R1=3.66%、R2=3.23%、R3=3.10%、R4=2.94%、R5=2.80%、R6=2.82%
In the formula: ri-represents the content of the maximum molecular water of the ith iron ore powder sample, wherein i = 1-6;
mifront sideThe number of the ith iron ore powder sample before drying is represented as g, wherein i = 1-6;
mirear endThe number of the ith iron ore powder sample after being dried is represented as g, wherein i = 1-6;
9) calculating the maximum molecular water R of the iron ore powder: first, the curve equation is determined: y is the Ri value calculated in the step 8), and mi weighed in the step 6)Front sideHas a value of x and inputs its data into a data analysis tool to determine a fitterEquation until the fitting variance value is 0.984 (not less than 0.95), the fitting equation is the curve equation to be determined as y = x/(-2.72751 + 0.33642x + 0.56845x1/2) The calculated y value is the maximum molecular water R =2.76% of the test example by substituting x =50g into the determined curve equation.
Example 2
method for accurately measuring the maximum molecular water content of iron ore powder, comprising the following steps:
1) drying the iron ore powder to be detected at 106 ℃ for 3 h;
2) and (3) screening the dried iron ore powder in a particle size grade of: less than 0.5mm, 0.5 to less than 1.0mm, 1.0 to less than 2.0mm, 2.0 to less than 3.15mm, 3.15 to less than 5.0mm, 5.0 to less than 6.3mm, not less than 6.3 mm;
3) selecting iron ore powder with the size fraction of less than 0.5 mm; the number i of the samples is 5, the samples are split and packaged, and the sampling amount of each sample is selected in a range of 10-100 g in an unequal manner; the weight of the weighed sample is expressed by mi and is respectively m1=8g、m2=12g、m3=16g、m4=20g、m5=24；i=1~5；
4) To m1、m2、m3、m4、m5Soaking each iron ore powder sample in water for 18 hours, and burying the iron ore powder sample in the water;
5) the soaked iron ore powder sample m1、m2、m3、m4、m5Respectively fishing and removing the water on the surface; then, carrying out centrifugal dehydration on each iron ore powder sample, and controlling the rotating speed of a centrifugal machine to be 10000r/min and the centrifugal dehydration time to be 15 minutes;
6) the dehydrated iron ore powder sample m1、m2、m3、m4、m5Respectively taking out and weighing, wherein the weighed iron ore powder sample amount is m1 front、m2 front、m3 front、m4 front、m5 frontDenotes that the data is m1 front=6.14 g、m2 front=9.32 g、m3 front=12.09 g、m4 front=15.81 g、m5 front=18.79 g, the weighed sample amount of the iron ore powder is more than 75wt% of the charged amount;
7) for the weighed iron ore powder sample m1 front、m2 front、m3 front、m4 front、m5 frontDrying at 105 ℃ for 4 h; weighing the sample amount of the dried iron ore powder, wherein the data is m1 after=5.92 g、m2 after=9.00 g、m3 after=11.68 g、m4 after=15.29 g、mAfter 5=18.18 g；
8) Calculating the content Ri of the maximum molecular water of the ith sample: m is weighed out1 front、m2 front、m3 front、m4 front、m5 frontAnd m1 after、m2 after、m3 after、m4 after、mAfter 5Respectively substituting the following formulas to respectively calculate R1~ R5Value of
Ri=100*(miFront side-miRear end)/ miFront side%
Calculated, R1=3.55%, R2=3.47%, R3=3.38%, R4=3.31%, R5=3.25%
In the formula: ri-represents the content of the maximum molecular water of the ith iron ore powder sample, wherein i = 1-5;
mifront sideThe number of the ith iron ore powder sample before drying is represented as g, wherein i = 1-5;
mirear endThe number of the ith iron ore powder sample after being dried is represented as g, wherein i = 1-5;
9) calculating the maximum molecular water R of the iron ore powder: first, the curve equation is determined: y is the Ri value calculated in the step 8), and mi weighed in the step 6)Front sideX and input its data to the data analysis tool to determine the fitting equation, i.e. the curve equation to be determined, y =4.18425 (1 + x), until the fitting variance value is 0.982 (not less than 0.95)-0.07523The calculated y value is the maximum molecular water R =3.11% of the test example by substituting x =50g into the determined curve equation.
Example 3
method for accurately measuring the maximum molecular water content of iron ore powder, comprising the following steps:
1) drying the iron ore powder to be detected at the drying temperature of 103 ℃ for 4 h;
2) and (3) screening the dried iron ore powder in a particle size grade of: less than 0.5mm, 0.5 to less than 1.0mm, 1.0 to less than 2.0mm, 2.0 to less than 3.15mm, 3.15 to less than 5.0mm, 5.0 to less than 6.3mm, not less than 6.3 mm;
3) selecting iron ore powder with the size fraction of less than 0.5 mm; the number i of the samples is 5, the samples are split and packaged, and the sampling amount of each sample is selected in a range of 10-100 g in an unequal manner; the weight of the weighed sample is expressed by mi and is respectively m1=8g、m2=12g、m3=16g、m4=20g、m5=24g；i=1~5；
4) To m1、m2、m3、m4、m5Soaking each iron ore powder sample in water for 18 hours, and burying the iron ore powder sample in the water;
5) the soaked iron ore powder sample m1、m2、m3、m4、m5Respectively fishing and removing the water on the surface; then, each iron ore powder sample is subjected to centrifugal dehydration, the rotating speed of a centrifugal machine is controlled to be 11000r/min, and the centrifugal dehydration time is 30 minutes;
6) the dehydrated iron ore powder sample m1、m2、m3、m4、m5Respectively taking out and weighing, wherein the weighed iron ore powder sample amount is m1 front、m2 front、m3 front、m4 front、m5 frontDenotes that the data is m1 front=6.7 g、m2 front=10.39 g、m3 front=12.03 g、m4 front=15.97 g、m5 front=19.4 g, the weighed sample amount of the iron ore powder is more than 75wt% of the charged amount;
7) for the weighed iron ore powder sample m1 front、m2 front、m3 front、m4 front、m5 frontDrying at 105 ℃ for 4 h; and drying the driedWeighing the sample amount of the iron ore powder, wherein the data is m1 after=6.56 g、m2 after=10.22 g、m3 after=11.90 g、m4 after=15.83 g、mAfter 5=19.24 g；
8) Calculating the content Ri of the maximum molecular water of the ith sample: m is weighed out1 front、m2 front、m3 front、m4 front、m5 frontAnd m1 after、m2 after、m3 after、m4 after、mAfter 5Respectively substituting the following formulas to respectively calculate R1~ R5Value of
Ri=100*(miFront side-miRear end)/ miFront side%
Calculated, R1=2.09%、R2=1.61%、R3=1.08%、R4=0.87%、R5=0.80%
In the formula: ri-represents the content of the maximum molecular water of the ith iron ore powder sample, wherein i = 1-5;
mifront sideThe number of the ith iron ore powder sample before drying is represented as g, wherein i = 1-5;
mirear endThe number of the ith iron ore powder sample after being dried is represented as g, wherein i = 1-5;
9) calculating the maximum molecular water R of the iron ore powder: first, the curve equation is determined: y is the Ri value calculated in the step 8), and mi weighed in the step 6)Front sideThe value x and its data are input to a data analysis tool to determine the fitting equation, i.e. the curve equation to be determined, y = x/(40.39472 + 5.43551x-28.30435 x) until the fitting variance value is 0.989 (not less than 0.95)1/2) And substituting x =50g into the determined curve equation, and calculating the y value to be the maximum molecular water R =0.45% of the test example.
Example 4
method for accurately measuring the maximum molecular water content of iron ore powder, comprising the following steps:
1) drying the iron ore powder to be detected at 105 ℃ for 4 h;
2) and (3) screening the dried iron ore powder in a particle size grade of: less than 0.5mm, 0.5 to less than 1.0mm, 1.0 to less than 2.0mm, 2.0 to less than 3.15mm, 3.15 to less than 5.0mm, 5.0 to less than 6.3mm, not less than 6.3 mm;
3) selecting iron ore powder with the size fraction of less than 0.5 mm; the number i of the samples is 6, the samples are split and packaged, and the sampling amount of each sample is selected in a range of 10-100 g in an unequal manner; the weight of the weighed sample is expressed by mi and is respectively m1=12g、m2=20g、m3=28g、m4=32g、m5=40g、m6=50g；i=1~6；
4) To m1、m2、m3、m4、m5、m6Soaking each iron ore powder sample in water for 24 hours, and burying the iron ore powder sample in the water;
5) the soaked iron ore powder sample m1、m2、m3、m4、m5、m6Respectively fishing and removing the water on the surface; then, each iron ore powder sample is subjected to centrifugal dehydration, the rotating speed of a centrifugal machine is controlled to be 11000r/min, and the centrifugal dehydration time is 20 minutes;
6) the dehydrated iron ore powder sample m1、m2、m3、m4、m5、m6Respectively taking out and weighing, wherein the weighed iron ore powder sample amount is m1 front、m2 front、m3 front、m4 front、m5 front、m6 frontDenotes that the data is m1 front=9.45 g、m2 front=16.73 g、m3 front=23.14 g、m4 front=26.69 g、m5 front=33.78 g、m6 front=40.62 g, the weighed iron ore powder samples are more than 75wt% of the charged amount;
7) for the weighed iron ore powder sample m1 front、m2 front、m3 front、m4 front、m5 front、m6 frontDrying at 106 ℃ for 3 h; weighing the sample amount of the dried iron ore powder, wherein the data is m1 after=8.65 g、m2 after=15.46 g、m3 after=21.54 g、m4 after= 24.95 g、mAfter 5=31.62 g、m6 back= 38.09 g；
8) Calculating the content Ri of the maximum molecular water of the ith sample: m is weighed out1 front、m2 front、m3 front、m4 front、m5 front、m6 frontAnd m1 after、m2 after、m3 after、m4 after、mAfter 5、m6 backRespectively substituting the following formulas to respectively calculate R1~ R6Value of
Ri=100*(miFront side-miRear end)/ miFront side%
Calculated, R1=8.43%、R2=7.62%、R3=6.93%、R4=6.51%、R5=6.38%、R6=6.24%
In the formula: ri-represents the content of the maximum molecular water of the ith iron ore powder sample, wherein i = 1-6;
mifront sideThe number of the ith iron ore powder sample before drying is represented as g, wherein i = 1-6;
mirear endThe number of the ith iron ore powder sample after being dried is represented as g, wherein i = 1-6;
9) calculating the maximum molecular water R of the iron ore powder: first, the curve equation is determined: y is the Ri value calculated in the step 8), and mi weighed in the step 6)Front sideThe value x and its data are input to a data analysis tool to determine a fitting equation, i.e. the curve equation to be determined, y =6.166 + 35.6566/(sqrt (2 Pi) 0.5338 x) e (- (Inx/13.466), until the fitting variance value is 0.989 (not less than 0.95)2/（2*（0.5338）2) X =50 g) into the determined curve equation, the calculated y value is the maximum molecular water R =6.19% of the test example.
Example 5
method for accurately measuring the maximum molecular water content of iron ore powder, comprising the following steps:
1) drying the iron ore powder to be detected at 107 ℃ for 3 h;
2) and (3) screening the dried iron ore powder in a particle size grade of: less than 0.5mm, 0.5 to less than 1.0mm, 1.0 to less than 2.0mm, 2.0 to less than 3.15mm, 3.15 to less than 5.0mm, 5.0 to less than 6.3mm, not less than 6.3 mm;
3) selecting iron ore powder with the size fraction of less than 0.5 mm; the number i of the samples is 6, the samples are split and packaged, and the sampling amount of each sample is selected in a range of 10-100 g in an unequal manner; the weight of the weighed sample is expressed by mi and is respectively m1=20g、m2=24g、m3=28g、m4=32g、m5=40g、m6=50g；i=1~6；
4) To m1、m2、m3、m4、m5、m6Soaking each iron ore powder sample in water for 18 hours, and burying the iron ore powder sample in the water;
5) the soaked iron ore powder sample m1、m2、m3、m4、m5、m6Respectively fishing and removing the water on the surface; then, carrying out centrifugal dehydration on each iron ore powder sample, and controlling the rotating speed of a centrifugal machine to be 10000r/min and the centrifugal dehydration time to be 20 minutes;
6) the dehydrated iron ore powder sample m1、m2、m3、m4、m5、m6Respectively taking out and weighing, wherein the weighed iron ore powder sample amount is m1 front、m2 front、m3 front、m4 front、m5 front、m6 frontDenotes that the data is m1 front=16.17 g、m2 front=19.85 g、m3 front=23.14 g、m4 front=27.05 g、m5 front=32.18g、m6 front=41.63g, the weighed iron ore powder samples are more than 75wt% of the charged amount;
7) for the weighed iron ore powder sample m1 front、m2 front、m3 front、m4 front、m5 front、m6 frontDrying at 106 ℃ for 3 h; weighing the sample amount of the dried iron ore powder, wherein the data is m1 after=15.17g、m2 after=18.73 g、m3 after=21.90g、m4 after= 25.65g、mAfter 5=30.56g、m6 back= 39.58g；
8) Calculating the content Ri of the maximum molecular water of the ith sample: m is weighed out1 front、m2 front、m3 front、m4 front、m5 front、m6 frontAnd m1 after、m2 after、m3 after、m4 after、mAfter 5、m6 backRespectively substituting the following formulas to respectively calculate R1~ R6Value of
Ri=100*(miFront side-miRear end)/ miFront side%
Calculated, R1=6.17%、R2=5.64%、R3=5.37%、R4=5.18%、R5=5.02%、R6=4.93%
In the formula: ri-represents the content of the maximum molecular water of the ith iron ore powder sample, wherein i = 1-6;
mifront sideThe number of the ith iron ore powder sample before drying is represented as g, wherein i = 1-6;
mirear endThe number of the ith iron ore powder sample after being dried is represented as g, wherein i = 1-6;
9) calculating the maximum molecular water R of the iron ore powder: first, the curve equation is determined: y is the Ri value calculated in the step 8), and mi weighed in the step 6)Front sideThe value of x was calculated as R =4.91% of the maximum molecular water for this test example, and data thereof was input to the data analysis tool to determine a fitting equation, i.e., y =12.6266 × e (-x/7.0412) +4.8964 as a curve equation to be determined, until the fitting variance value was 0.999 (not less than 0.95).
The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention.
Claims (1)
1, method for accurately measuring the maximum molecular water content of iron ore powder, comprising the following steps:
1) drying the iron ore powder to be detected at the drying temperature of not less than 100 ℃ for not less than 2 hours, and controlling the water content of the iron ore powder not to exceed 0.001wt% after the iron ore powder is flood-dried;
2) and (3) screening the dried iron ore powder in a particle size grade of: less than 0.5mm, 0.5 to less than 1.0mm, 1.0 to less than 2.0mm, 2.0 to less than 3.15mm, 3.15 to less than 5.0mm, 5.0 to less than 6.3mm, not less than 6.3 mm;
3) selecting iron ore powder of the size fraction to be measured; the number i of the samples is not less than 4, the samples are split and packaged, and the sampling quantity m of each sample is selected in a range of 10-100 g in an unequal manner; the weight of the weighed sample is expressed by mi; i = 1-n;
4) soaking each iron ore powder sample in water for not less than 12 hours, and burying the iron ore powder sample in the water;
5) fishing out the soaked iron ore powder sample and removing water on the surface of the iron ore powder sample; then, carrying out centrifugal dehydration on each iron ore powder sample, and controlling the rotating speed of a centrifugal machine to be not less than 10000r/min, wherein the centrifugal dehydration time is not less than 10 minutes;
6) taking out and weighing the dehydrated iron ore powder sample, and using mi as the weighed iron ore powder sample amountFront sideIt is noted that the weighed iron ore powder sample amount is not less than 70wt% of the charged amount;
7) to the weighed iron ore powder sample miFront sideDrying at a temperature not lower than 100 ℃ for not less than 2 hours, and controlling the water content of the mineral powder not to exceed 0.001wt% after flood drying; weighing the sample amount of the dried iron ore powder, wherein the data is miRear endRepresents;
8) calculating the content Ri of the maximum molecular water of the ith sample: the weighed mi is mixedFront sideAnd miRear endRespectively substituted into the following formulas to calculate
Ri=100*(miFront side-miRear end)/ miFront side%
In the formula: ri-represents the content of the maximum molecular water of the ith iron ore powder sample, wherein i = 1-n;
mifront sideThe number of the ith iron ore powder sample before drying is represented as g, wherein i = 1-n;
mirear end-represents the secondThe number of the dried i iron ore powder samples is g, wherein i = 1-n;
9) calculating the maximum molecular water R of the iron ore powder: first, the curve equation is determined: y is the Ri value calculated in the step 8), and mi weighed in the step 6)Front sideThe value is x, and the data is input into a data analysis tool to determine a fitting equation, and the fitting equation is a curve equation to be determined until the fitting variance value is not less than 0.95; substituting x =50g into the determined curve equation, wherein the calculated y value is the maximum molecular water R; the iron ore powder refers to the size fraction iron ore powder to be measured in the step 3).
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