CN115979976A - Method for detecting flocculating agent in washing machine-made sand - Google Patents
Method for detecting flocculating agent in washing machine-made sand Download PDFInfo
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- CN115979976A CN115979976A CN202211635797.3A CN202211635797A CN115979976A CN 115979976 A CN115979976 A CN 115979976A CN 202211635797 A CN202211635797 A CN 202211635797A CN 115979976 A CN115979976 A CN 115979976A
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- 239000004576 sand Substances 0.000 title claims abstract description 85
- 239000008394 flocculating agent Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005406 washing Methods 0.000 title claims abstract description 21
- 238000004140 cleaning Methods 0.000 claims abstract description 55
- 238000002835 absorbance Methods 0.000 claims abstract description 44
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 43
- 239000004567 concrete Substances 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000000243 solution Substances 0.000 claims abstract description 26
- 239000012086 standard solution Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000003638 chemical reducing agent Substances 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 13
- 239000010881 fly ash Substances 0.000 claims description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 13
- 239000011707 mineral Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 239000004575 stone Substances 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000011481 absorbance measurement Methods 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 5
- 239000005708 Sodium hypochlorite Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229960000583 acetic acid Drugs 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a method for detecting a flocculating agent in washing machine-made sand, which comprises the steps of adding concrete components into polyacrylamide solutions and cleaning liquids with different concentrations, respectively measuring absorbance under various conditions, drawing absorbance curves of the different components in the polyacrylamide solutions with different concentrations, and comparing the measured data to obtain the concentration of the polyacrylamide in the machine-made sand, namely the concentration of the flocculating agent. The method does not carry out accurate content detection, and can eliminate the influence of various impurities on the result by using standard solutions with known concentrations and calculating the content of the flocculating agent by a method of comparing absorbance under the same conditions. In addition, the error data is removed and then weighted average is carried out, and the influence of each component and the effect on the flocculating agent under the mixing condition is fully considered, so that whether the purchased machine-made sand meets the use requirement of a specific formula or not is quickly and accurately judged.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a method for detecting a flocculating agent in washing machine-made sand.
Background
Sand, which typically accounts for 30% and more of the volume of the concrete, is an important raw material component of concrete. As river sand mining is limited, machine-made sand manufactured from crushed stone is on the market on a large scale. The machine-made sand raw material stone is usually mixed with pug and needs to be washed by water to remove the pug, and because of the environmental protection requirement, the water used in a machine-made sand field can not be discharged outside and needs to be recycled, the water formed by production is usually treated by flocculating agents such as polyacrylamide and the like.
The mechanism of the flocculating agent is mainly that groups with positive (negative) electricity and particles or granules with negative (positive) electricity in water which are difficult to separate are close to each other, the potential of the particles is reduced, the particles are in an unstable state, and the particles are concentrated and separated by a physical or chemical method by utilizing the polymerization property of the particles. The wash water is clarified in the settling tank and recycled by adding a flocculant to the wash water. In the process of washing machine-made sand by water in a machine-made sand field to remove mud, a flocculant in recycled cleaning water exists in the machine-made sand in the form of aqueous solution or mud adsorbed in the sand, and the water content and mud content of the machine-made sand are high, so that the machine-made sand produced by the machine-made sand field contains certain flocculant components.
Because the concentration of the flocculating agent in the current building mechanism sand is extremely low and is interfered by other factors, the general chemical analysis is difficult to detect. It was concluded through a number of experiments that the residual content of polyacrylamide in the machine sand could not exceed 3 × 10 -5 (the ratio of the mass of the washed machine-made sand) exceeds the value, the initial fluidity and slump loss of the concrete are both deteriorated, and the construction performance of the concrete is seriously influenced. Therefore, the determination of the content of the flocculating agent in the machine-made sand has important practical significance for controlling the quality of concrete.
Chinese patent CN202110861099.4 provides a method for rapidly detecting the residual amount of a flocculant in sand for concrete, which prepares a sand sample for concrete to be detected, which does not contain a flocculant, and other concrete raw materials into a concrete sample according to process requirements, so as to determine whether the concentration range of the flocculant remaining in the sand exceeds the qualified doping amount standard of the flocculant to be detected. On one hand, the method for measuring the content of the flocculating agent in the building sand and the influence of the flocculating agent has a large error, on the other hand, the test has a plurality of influencing factors including the grain composition, the grain diameter, the form and the mud content of two kinds of sand, and the variables are difficult to control for strict comparative analysis; on the other hand, the experimental results are also very susceptible to the manipulation technique and skill level of the operator, and it is difficult to obtain the desired results.
Chinese patent CN202210331363.8 discloses a method for controlling residual amount of flocculant in sand produced by a washing machine, wherein a method for detecting flocculant content is provided: and adding a sodium hypochlorite solution into the prepared polyacrylamide solution sample, then adding the solution into an acid solution, respectively measuring light absorption values, and striving to measure the accurate concentration of polyacrylamide according to the change condition of the light absorption values. However, in the actual production of concrete, the oxidation of sodium hypochlorite is inhibited by reducing substances such as sulfide and sulfite contained in the formula components, so that the measured result has large deviation from the actual content of the flocculant.
Disclosure of Invention
According to the characteristics of the concrete industry, the content of polyacrylamide in the machine-made sand is low, and the existing influence factors are complex. In order to solve the problems in the prior art, the invention provides a method for detecting a flocculating agent in washing machine-made sand. The method can simply and quickly determine the content range of the flocculating agent in the sand and determine the influence degree of the residual flocculating agent in the machine-made sand on the working performance of the concrete.
The specific technical scheme is as follows:
a method for detecting a flocculating agent in washing machine-made sand comprises the following steps:
(1) Determining the formula components of the concrete, which specifically comprises the following steps: 250-300 g of cement, 120-180 g of fly ash, 90-120 g of mineral powder, 820-860 g of machine-made sand, 950-1000 g of broken stone, 7-11 g of water reducing agent and 115-125 g of water;
(2) Taking 820-860 g of machine-made sand, paving the machine-made sand on a 150-mesh screen, dividing 115-125 g of deionized water into 3 equal parts, sequentially using each part of deionized water to clean the machine-made sand on the screen for 5-10 times, collecting cleaning water, standing, filtering out bottom solids, supplementing the weight of the cleaning water to the original weight to obtain cleaning liquid L1, and drying the cleaned machine-made sand to obtain cleaning sand;
(3) Respectively prepared with the mass concentration of 1 multiplied by 10 -6 、5×10 -6 、1×10 -5 、5×10 -5 And 1X 10 -4 The polyacrylamide standard solution L2-L6;
(4) Respectively adding equal mass of cement, fly ash, mineral powder, machine-made sand, broken stone, a water reducing agent and cleaning sand into the cleaning solution L1 and the polyacrylamide standard solutions L2-L6, uniformly stirring, standing for 15min, and measuring the absorbance value of each sample;
(5) Weighing various components except water according to the component range in the step (1), uniformly stirring, taking 6 parts of samples with equal mass, respectively adding the samples into the cleaning solution L1 and the polyacrylamide standard solution L2-L6, wherein the adding weight is the same as that in the step (4), uniformly stirring, standing for 15min, and measuring the absorbance value of each sample;
(6) Respectively drawing polyacrylamide concentration-absorbance relation curves of mixed components of cement, fly ash, mineral powder, machine-made sand, broken stone, a water reducing agent, cleaning sand and concrete according to data about the polyacrylamide standard solution L2-L6 determination in the steps (4) and (5);
(7) Comparing the absorbance value of the cleaning liquid L1 in the step (4) with the curve in the step (6) to obtain the content A of the flocculating agent in the cleaning liquid L1 of each component of the concrete i Obtaining the flocculant content A of the cleaning sand relative to the cleaning liquid L1 s (ii) a Comparing the absorbance value of the cleaning liquid L1 in the step (5) with the curve in the step (6) to obtain the content A of the flocculating agent in the cleaning liquid L1 Mixing of (ii) a Removing A i Averaging after the medium error data to obtain a calculated value A of the content of the flocculating agent in the cleaning liquid Average out 。
Furthermore, the weight ratio of each component and the concrete mixture in the step (4) and the step (5) to the cleaning solution L1 and the polyacrylamide standard solution L2-L6 is 1.
Further, the mixed solutions obtained in the steps (4) and (5) were measured for absorbance in the range of 285 to 300 nm.
Furthermore, in the step (6), the polyacrylamide concentration-absorbance relation curve is a straight line parallel to a coordinate axis, namely, the absorbance value does not change along with the change of the polyacrylamide concentration, and the flocculant content value A corresponding to the curve is not calculated in the step (7) i 。
Further, step (a)7) In (A) i ＞130％A s Or A i ＜70％A s And is error data.
Further, in the step (7), an average value is calculated according to the following formula:
wherein: m is i Calculated mass percentages of the components are included.
Further, under the condition that the concrete formula is not changed, in order to measure the content range of the flocculant in different batches of washing machine-made sand, after the cleaning solution L1 is obtained, cement, fly ash, mineral powder, machine-made sand, gravel and a water reducing agent are respectively added into the cleaning solution L1, the absorbance value of each sample is measured, the absorbance values are respectively compared with the curves in the step 6 to obtain the absorbance values under each condition, and the average value is calculated after data with obvious deviation are removed, so that the content of the flocculant in the cleaning solution is obtained.
Further, the formula of the concrete in the step (1) is changed, and the steps (1) to (7) are repeated according to new formula components.
Compared with the prior art, the invention has the following advantages: (1) The traditional turbidity method uses reagents such as sodium hypochlorite and glacial acetic acid to measure the content of polyacrylamide, is very easy to be interfered by other ions in the solution, and is difficult to obtain an accurate judgment result. The method does not carry out accurate content detection, and can eliminate the influence of various impurities on the result by calculating the content of the flocculating agent by comparing the absorbance under the same condition by using a standard solution with known concentration. (2) The absorbance curves of the components and the polyacrylamide solutions with different contents are respectively measured, weighted average is carried out after error data is removed, and the influence of the components and the effect on the flocculating agent under the mixing condition is fully considered, so that whether the purchased machine-made sand meets the use requirement of a certain specific formula can be quickly and accurately judged.
Drawings
FIG. 1 is a concentration-absorbance relationship curve of cement with respect to polyacrylamide;
FIG. 2 is a concentration-absorbance relationship curve of fly ash with respect to polyacrylamide;
FIG. 3 is a concentration-absorbance relationship curve of mineral powder with respect to polyacrylamide;
FIG. 4 is a concentration-absorbance relationship curve of machine-made sand with respect to polyacrylamide;
FIG. 5 is a concentration-absorbance relationship of the cleaning sand with respect to polyacrylamide;
FIG. 6 is a graph showing the relationship between the concentration and absorbance of polyacrylamide in the crushed stone;
FIG. 7 is a concentration-absorbance relationship curve of a water reducing agent with respect to polyacrylamide;
FIG. 8 is a concentration-absorbance relationship curve of mixed components with respect to polyacrylamide;
in each figure, the vertical axis represents the absorbance value of the sample, and the horizontal axis represents polyacrylamide samples of different concentrations.
Detailed Description
The following describes embodiments of the present invention with reference to specific examples.
Step one, determining the formula components of concrete
The method specifically comprises the following steps: 260g of cement, 170g of fly ash, 120g of mineral powder, 825g of machine-made sand, 950g of broken stone, 9g of water reducing agent and 120g of water.
Step two, obtaining cleaning fluid and cleaning sand
And (3) paving 825g of machine-made sand on a 150-mesh screen, dividing 120g of deionized water into 3 equal parts, sequentially washing the machine-made sand on the screen for 10 times by using each part of deionized water, collecting washing water, standing, filtering out bottom solids, supplementing the weight of the washing water to the original weight to obtain washing liquid L1, and drying the washed machine-made sand to obtain the washing sand.
Step three, preparing polyacrylamide standard solution
Respectively prepared with the mass concentration of 1 multiplied by 10 -6 、5×10 -6 、1×10 -5 、5×10 -5 And 1X 10 -4 And polyacrylamide standard solutions L2 to L6.
Step four, measuring the absorbance of each component and the cleaning sand in solutions with different concentrations
Cement, fly ash, mineral powder, machine-made sand, broken stone, a water reducing agent and cleaning sand with equal mass are respectively added into the cleaning solution L1 and the polyacrylamide standard solutions L2-L6, the mass ratio of each concrete component and the cleaning sand to the solutions L1-L6 is 1.
Step five, determining the absorbance of the concrete mixed component in solutions with different concentrations
Weighing various components except water according to the component range in the step one, uniformly stirring, taking 6 parts of samples with equal mass, respectively adding the samples into the cleaning solution L1 and the polyacrylamide standard solutions L2-L6, respectively, wherein the mass ratio of the concrete mixed components to the components L1-L6 is 1.
Step six, drawing a concentration-absorbance curve
And respectively drawing polyacrylamide concentration-absorbance relation curves of the mixed components of cement, fly ash, mineral powder, machine-made sand, broken stone, a water reducing agent, cleaning sand and concrete according to data about the determination of the polyacrylamide standard solution L2-L6 in the fourth step and the fifth step. If the polyacrylamide concentration-absorbance relation curve is a straight line parallel to the coordinate axis, namely the absorbance value does not change along with the change of the concentration of the polyacrylamide, and the flocculant content value A corresponding to the curve is not calculated in the seventh step i 。
Step seven, data analysis
Comparing the absorbance value of the cleaning solution L1 in the fourth step with the curve in the sixth step to obtain the content A of the flocculating agent in the cleaning solution L1 of each component of the concrete i To obtain the flocculant content A of the cleaning sand with respect to the cleaning liquid L1 s 。
Comparing the absorbance value of the cleaning liquid L1 in the step five with the curve in the step six to obtain the content A of the flocculant in the cleaning liquid L1 Mixing . If A is i ＞130％A s Or A i ＜70％A s Then A is i As error data cullingThe calculated value A of the content of the flocculating agent in the cleaning liquid is obtained by averaging according to the following formula (1) Average 。
Wherein m is i Calculated mass percentages of the components are included.
TABLE 1 absorbance values of samples in solutions of different concentrations
| L1 | L2 | L3 | L4 | L5 | L6 | |
| Cement | 0.23 | 0.12 | 0.18 | 0.26 | 0.31 | 0.39 |
| Fly ash | 0.26 | 0.11 | 0.18 | 0.27 | 0.3 | 0.35 |
| Mineral powder | 0.20 | 0.12 | 0.17 | 0.23 | 0.31 | 0.4 |
| Machine-made sand | 0.42 | 0.19 | 0.36 | 0.41 | 0.53 | 0.62 |
| Cleaning sand | 0.21 | 0.09 | 0.17 | 0.23 | 0.29 | 0.35 |
| Crushing stone | 0.08 | 0.08 | 0.08 | 0.09 | 0.08 | 0.09 |
| Water reducing agent | 0.06 | 0.06 | 0.06 | 0.06 | 0.06 | 0.07 |
| Mixing the components | 0.42 | 0.26 | 0.37 | 0.45 | 0.52 | 0.58 |
And (5) finding that curves of two groups of data of the gravel and the water reducing agent are basically parallel to a coordinate axis through drawing, and rejecting the two groups of data. Comparing the absorbance value of the cleaning liquid L1 with the curves shown in the attached figures 1-5 and 8, respectively obtaining the mass concentrations of the polyacrylamide as follows: 8.85X 10 -6 、9.63×10 -6 、8.70×10 -6 、1.02×10 -5 、9.13×10 -6 、9.33×10 -6 . A is obtained by calculation according to the formula (1) Average out Is 9.25X 10 -6 。
Finally, it should be noted that the above-mentioned embodiments do not limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or some technical features may be substituted equally. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for detecting a flocculating agent in washing machine-made sand is characterized by comprising the following steps:
(1) Determining the formula components of the concrete, which specifically comprises the following steps: 250-300 g of cement, 120-180 g of fly ash, 90-120 g of mineral powder, 820-860 g of machine-made sand, 950-1000 g of broken stone, 7-11 g of water reducing agent and 115-125 g of water;
(2) Taking 820-860 g of machine-made sand, paving the machine-made sand on a 150-mesh screen, dividing 115-125 g of deionized water into 3 equal parts, sequentially using each part of deionized water to clean the machine-made sand on the screen for 5-10 times, collecting cleaning water, standing, filtering out bottom solids, supplementing the weight of the cleaning water to the original weight to obtain cleaning liquid L1, and drying the cleaned machine-made sand to obtain cleaning sand;
(3) Respectively prepared with the mass concentration of 1 multiplied by 10 -6 、5×10 -6 、1×10 -5 、5×10 -5 And 1X 10 -4 The polyacrylamide standard solution L2-L6;
(4) Respectively adding equal mass of cement, fly ash, mineral powder, machine-made sand, broken stone, a water reducing agent and cleaning sand into the cleaning solution L1 and the polyacrylamide standard solutions L2-L6, uniformly stirring, standing for 15min, and measuring the absorbance value of each sample;
(5) Weighing various components except water according to the component range in the step (1), uniformly stirring, taking 6 parts of samples with equal mass, respectively adding the samples into the cleaning solution L1 and the polyacrylamide standard solution L2-L6, wherein the adding weight is the same as that in the step (4), uniformly stirring, standing for 15min, and measuring the absorbance value of each sample;
(6) Respectively drawing polyacrylamide concentration-absorbance relation curves of mixed components of cement, fly ash, mineral powder, machine-made sand, gravel, a water reducing agent, cleaning sand and concrete according to data about the determination of the polyacrylamide standard solution L2-L6 in the steps (4) and (5);
(7) Comparing the absorbance value of the cleaning liquid L1 in the step (4) with the curve in the step (6) to obtain the content Ai of the flocculating agent in the cleaning liquid L1 of each component of the concrete, and obtaining the content A of the flocculating agent in the cleaning sand relative to the cleaning liquid L1 s (ii) a Comparing the absorbance value of the cleaning liquid L1 in the step (5) with the curve in the step (6) to obtainMixing until the flocculant content A in the cleaning liquid L1; removing A i And averaging after the error data are obtained to obtain the calculated value A average of the content of the flocculating agent in the cleaning liquid.
2. The method for detecting the flocculating agent in the washed machine-made sand according to claim 1, wherein the weight ratio of the components in the step (4) and the step (5) to the weight ratio of the cleaning solution L1 and the polyacrylamide standard solution L2-L6 is 1.
3. The method for detecting the flocculating agent in the washed machine-made sand according to claim 1, wherein the mixed liquid obtained in the steps (4) and (5) is subjected to absorbance measurement in a range of 285-300 nm.
4. The method for detecting the flocculant in the sand manufactured by the washing machine according to claim 1, wherein if the absorbance value of the mixed liquid of a certain component does not change along with the concentration change of the polyacrylamide, the flocculant content value A corresponding to the component is not calculated in the step (7) i 。
5. The method for detecting the flocculating agent in the washed machine-made sand according to claim 1, wherein A is i ＞130％A s Or A i ＜70％A s And is error data.
6. The method for detecting the flocculating agent in the washed machine-made sand according to the claim 1, wherein the average value is calculated in the step (7) according to the following formula:
wherein: m is i Calculated mass percentages of the components are included.
7. The method for detecting the flocculant in the washing machine-made sand according to claim 1, wherein in order to measure the content range of the flocculant in different batches of washing machine-made sand under the condition that the concrete formula is not changed, cement, fly ash, mineral powder, machine-made sand, gravel and a water reducing agent are respectively added into the washing liquid L1 after the washing liquid L1 is obtained, the absorbance value of each sample is measured, the absorbance values are respectively compared with the curves in the step 6 to obtain the absorbance values under each condition, and the average value is calculated after data with obvious deviation is removed to obtain the content of the flocculant in the washing liquid.
8. The method for detecting the flocculating agent in the washed machine-made sand according to the claim 1, wherein the formula of the concrete in the step (1) is changed, and the steps (1) to (7) are repeated according to new formula components.
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| CN117110198A (en) * | 2023-08-28 | 2023-11-24 | 石家庄市长安育才建材有限公司 | Method for rapidly detecting type and content of flocculant in machine-made sand |
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| CN117110198A (en) * | 2023-08-28 | 2023-11-24 | 石家庄市长安育才建材有限公司 | Method for rapidly detecting type and content of flocculant in machine-made sand |
| CN117110198B (en) * | 2023-08-28 | 2024-04-12 | 石家庄市长安育才建材有限公司 | Method for rapidly detecting type and content of flocculant in machine-made sand |
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