CN114264680A - Method for predicting fluoride concentration in mine water based on analogy method - Google Patents
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Abstract
The invention provides a method for predicting the fluoride concentration in mine water based on a comparison method, which comprises the following steps: step one, collecting and detecting a water sample in hydrogeological survey; step two, identifying a mine water burst source and quantitatively calculating the proportion of each source; analyzing the fluoride source in the mine water; fourthly, predicting the fluoride concentration of the mine water; step S41, the concentration of fluoride before mine water enters the goaf; and step S42, the concentration of fluoride in the goaf after the mine water stays in the goaf for a period of time. The method of the invention fully considers the source and formation of the fluoride in the mine water, and utilizes the concentration of the fluoride in the aquifer to compare and predict the concentration of the fluoride in the mine water, aiming at solving the problem that the concentration of the fluoride in the mine water is difficult to be accurately predicted. The method can be popularized and applied to the field, provides basic data for the system configuration of coal mine water treatment, and provides a basis for mine water resource treatment, allocation and control in a mining area.
Description
Technical Field
The invention belongs to the technical field of mines, relates to mine water resource protection and utilization, and particularly relates to a method for predicting fluoride concentration in mine water based on a comparison method.
Background
Coal occupies the main status of the energy consumption structure of China for a long time, wherein western coal resources occupy 70% of the total amount of national coal resources, but western regions belong to arid-semiarid climates, are ecologically fragile, are short of water resources, and only occupy less than 10% of the national area. Along with the trend of exhaustion of coal resources in the east, coal mining centers move gradually in the west, countries pay more attention to green coal mining, and the requirements of 'green mine construction specifications in coal industry (DZ/T0315-2018)' water resource shortage mining areas and mine water utilization rate reaching 100% are issued. According to statistics, the proportion of the western highly mineralized mine water in China exceeds 50%, and the high mineralized mine water has a positive effect on the enrichment of fluoride, so that the western mine water is relatively common in fluoride pollution. The fluorine-containing mine water is directly discharged outside, so that the fluoride pollution of the soil, surface water and underground water in a mining area is caused, and the fluorine poisoning of different degrees, such as dental fluorosis, fluorosis and the like, even kidney damage, thyroxine abnormality and physiological disorder can be caused by long-term drinking of high-fluorine water by nearby residents. The exceeding of the fluorine content becomes one of the restriction factors for the resource utilization of the mine water. Therefore, the method accurately predicts the concentration of the fluoride in the mine water, and selects the treatment process suitable for the concentration, thereby having important significance for the protection and utilization of high-fluorine mine water resources.
The previous method for predicting the mine water quality mostly focuses on the aspect of predicting the solute transport value, focuses on predicting the diffusion range of a certain pollutant in the mine water, is difficult to accurately predict the concentration of the certain pollutant in the mine water, and has strong theoretical prediction of the solute transport value and high technical threshold, so that the method is difficult to popularize and apply on site.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for predicting the fluoride concentration in mine water based on a comparison method, and solve the technical problem that the technical blank exists in the field of predicting the fluoride concentration in mine water in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for predicting the fluoride concentration in mine water based on a comparison method comprises the following steps:
step one, collecting and detecting a water sample in hydrogeological survey;
step two, identifying a mine water burst source and quantitatively calculating the proportion of each source;
analyzing the fluoride source in the mine water;
fourthly, predicting the fluoride concentration of the mine water;
step S41, the concentration of fluoride before mine water enters the goaf;
and step S42, the concentration of fluoride in the goaf after the mine water stays in the goaf for a period of time.
The invention also has the following technical characteristics:
specifically, the method comprises the following steps:
step one, collecting and detecting a water sample in hydrogeological survey:
collecting water samples of various aquifers, rock samples and mine water samples of a mined area during a mine hydrogeology compensation water pumping test;
detecting the concentration of fluoride in each aquifer water sample and the mine water sample; detecting stable hydrogen and oxygen isotopes in a water sample, wherein in a test result, delta D and delta18The detection precision of O is respectively +/-0.1 per mill and +/-0.02 per mill;
in the formula:
δ represents the per thousand deviation of the isotope ratio of the sample relative to the isotope ratio of the standard sample, in ‰;
Rsammplerepresenting the abundance of isotopes in the sample to be tested;
RVSMOWrepresents the abundance of isotopes in the international standard sample;
δ D represents the δ value of deuterium;
δ18o represents the delta value of oxygen 18;
detecting the components of the fluorine-containing minerals in the rock sample by adopting X-ray diffraction;
step two, identifying the mine water burst source and quantitatively calculating the proportion of each source:
analyzing the water chemistry characteristics of groundwater of different aquifers by means of a pipe three-line graph and an ion Schoeller graph, and counting and calculating delta D and delta of each type of water sample18Average value of O, comprehensive water chemistry characteristics, delta D and delta18Identifying a mine water source qualitatively by using the O relation; on the basis of the above, delta is18O is used as an identification parameter, the mine water source is divided, and the proportion of each water source is calculated through a formula II;
δO＝γA×δA+(1-γA)×δBformula II;
in the formula:
delta O is delta of mine water sample to be detected18O value, unit is per mill;
δAdelta of water sample of A aquifer18O value, unit is per mill;
δBis delta of a water-containing sample B18O value, unit is per mill;
γAis the proportion of the A aquifer;
and step three, analyzing fluoride sources in mine water:
according to the mass concentration of fluoride in different water samples of each aquifer, drawing fluoride concentration box graphs of different types of water samples, and judging the source of the fluoride according to the maximum value, the minimum value and the average value of the fluoride concentration in the different types of water samples;
and step four, predicting the fluoride concentration of the mine water:
according to the concentration of fluoride in an aquifer, the concentration of fluoride in mine water is predicted by using a comparison method, and the method comprises the following two steps:
step S41, the concentration of fluoride before mine water enters the goaf:
according to the source of the mine water and the concentration of fluoride in the aquifer of the water source of the water filling source, preliminarily calculating the concentration of fluoride before the mine water enters the goaf and reacts with the rock in the goaf through a formula III;
Cm＝γACA+γBCBformula III;
in the formula:
cm is the concentration of fluoride in the mine water before the mine water does not have water-rock interaction with the broken rock in the goaf;
γAand gammaBThe ratio of the water filling source of the aquifer A to the water filling source of the aquifer B to the mine water inflow is respectively;
CAand CBThe fluoride concentrations in the aqueous layers of A and B, respectively;
step S42, after the mine water stays in the goaf for a period of time, the concentration of fluorides in the goaf is as follows:
predicting the concentration of fluoride in the mine water of the unknown goaf by a formula IV according to the concentration of fluoride in the mine water of the goaf and the concentration of fluoride in an aquifer from which the fluoride is sourced in the excavation process by using a comparison method;
c ═ K Cm formula iv;
in the formula:
c is the concentration of fluoride in the mine water in the unknown goaf;
k is the ratio of the average concentration of fluoride in the mine water of the known goaf to the concentration of fluoride in the natural aquifer.
Compared with the prior art, the invention has the following technical effects:
the method of the invention fully considers the source and formation of the fluoride in the mine water, and utilizes the concentration of the fluoride in the aquifer to compare and predict the concentration of the fluoride in the mine water, aiming at solving the problem that the concentration of the fluoride in the mine water is difficult to be accurately predicted.
The method can be popularized and applied to the field, provides basic data for system configuration of coal mine water treatment, and provides a basis for mine water resource treatment, allocation and control in a mining area.
Drawings
Fig. 1 is a schematic working flow chart of the method for predicting the fluoride concentration in mine water based on the comparison method.
FIG. 2 is a three-line diagram of water sample pipe in the research area.
FIG. 3 is a fluoride concentration box plot.
The present invention will be explained in further detail with reference to examples.
Detailed Description
Fluorine is used as a lithophilic element, is widely distributed in the earth crust, widely exists in silicate minerals and rocks of rock circles in a trace manner, and adsorbs the surfaces of clay minerals such as residual kaolinite, illite and the like in a free state. Under the action of long-term water and rock, fluorine-containing minerals and free fluorine are converted into dissolved fluorides through the actions of dissolution, release, dissociation and the like and enter underground water, so that the concentration of the fluorides in the underground water is higher than 1mg/L specified in sanitary Standard for Drinking Water (GB 5749-2006). The mining of coal resources destroys the original aquifer structure, a large amount of underground water is gushed into a roadway and a goaf along mining-induced fractures, and the underground water further interacts with coal rocks on a working surface or gangue in the goaf in the process to form high fluoride mine water. Therefore, the concentration of the fluoride in the underground aquifer can be utilized, and the concentration of the fluoride in the mine water can be predicted more accurately by comparison, so that scientific basis is provided for the protection and utilization of mine water resources in western mining areas.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example (b):
this embodiment provides a method for predicting fluoride concentration in mine water based on a comparison method, as shown in fig. 1, the method includes the following steps:
step one, collecting and detecting a water sample in hydrogeological survey:
collecting water samples of various aquifers, rock samples and mine water samples of a mined area during a mine hydrogeology compensation water pumping test;
and (3) detecting the concentration of fluoride in each aquifer water sample and the mine water sample by adopting an American Thermo (Sammerfei) ICS-600 type ion chromatograph. Detecting hydrogen and oxygen stable isotopes in a water sample by adopting a Pocaro (Picaro) L2140-i isotope analyzer, wherein the test result adopts VSMOW standard, delta D and delta18The detection precision of O is respectively +/-0.1% and +/-0.02%.
In the formula:
δ represents the per thousand deviation of the isotope ratio of the sample relative to the isotope ratio of the standard sample, in ‰;
Rsamplerepresenting the abundance of isotopes in the sample to be tested;
RVSMOWrepresents the abundance of isotopes in the international standard sample;
δ D represents the δ value of deuterium;
δ18o represents the delta value of oxygen 18;
and detecting the fluorine-containing mineral component in the rock sample by adopting X-ray diffraction (XRD).
Step two, identifying the mine water burst source and quantitatively calculating the proportion of each source:
analyzing the water chemistry characteristics of groundwater of different aquifers by means of a pipe three-line graph and a main ion Schoeller graph, and counting and calculating the delta D and the delta of each type of water sample18Average value of O, comprehensive water chemistry characteristics, delta D and delta18Qualitative identification of ore by O-relationA well water source. On the basis of the above, delta is18O is used as an identification parameter, the mine water source is divided, and the proportion of each water source is calculated through a formula II;
δO＝γA×δA+(1-γA)×δBformula II;
in the formula:
delta O is delta of mine water sample to be detected18O value, unit is per mill;
δAdelta of water sample of A aquifer18O value, unit is per mill;
δBis delta of a water-containing sample B18O value, unit is per mill;
γAis the proportion of the A aquifer;
and step three, analyzing fluoride sources in mine water:
and (3) drawing fluoride concentration box graphs of different types of water samples according to the mass concentration of the fluoride in different water samples of each aquifer, and judging the main source of the fluoride according to the maximum value, the minimum value and the average value of the fluoride concentration in the water samples of different types.
And step four, predicting the fluoride concentration of the mine water:
according to the concentration of fluoride in an aquifer, the concentration of fluoride in mine water is predicted by using a comparison method, and the method mainly comprises the following two steps:
step S41, the concentration of fluoride before mine water enters the goaf:
according to the main source of the mine water and the concentration of the fluoride in the aquifer of the main water-filled water source, the concentration of the fluoride before the mine water enters the goaf and reacts with the rock in the goaf is preliminarily calculated through a formula III.
Cm＝γACA+γBCBFormula III;
in the formula:
cm is the concentration of fluoride in the mine water before the mine water does not have water-rock interaction with the broken rock in the goaf;
γAand gammaBThe ratio of the water filling source of the aquifer A to the water inflow of the mine water；
CAAnd CBThe fluoride concentrations in the aqueous layers of a and B, respectively.
Step S42, after the mine water stays in the goaf for a period of time, the concentration of fluorides in the goaf is as follows:
predicting the concentration of fluoride in the mine water of the unknown goaf by a formula IV according to the concentration of fluoride in the mine water of the goaf and the concentration of fluoride in an aquifer which is a main source of fluoride in the excavation process by using a comparison method;
c ═ K Cm formula iv;
in the formula:
c is the concentration of fluoride in the mine water in the unknown goaf;
k is the ratio of the average concentration of fluoride in the mine water of the known goaf to the concentration of fluoride in the natural aquifer.
Application example:
the Stone Ge Taiwan coal mine is located in the northwest of Shenmu city in Shaanxi province and has a distance of about 55 kilometers from the northwest of Wulanlun Hedong, and the administrative region belongs to the large willow tower test region of Shenmu city. The West of the Jingtian is Wulan Mulen river, the south of the Naja ditch of the Yangtze river, the North of the Yangtze river is connected with the Batuta of the Batuta, and the east of the Jingtian is bounded by the boundary of the Qi ditch and Shanmeng. East-west length about 10km, south-north width about 8km, area 65.283km2. The production capacity of the nuclear power is 1200 ten thousand tons/year, and the 2-2 coals and 3-1 coals of the Jurassic series Yanan group are mainly adopted at present. The stone Ge platform mine well water treatment plant is about to face reconstruction and expansion, in order to reasonably determine the treatment process and equipment configuration of the fluoride in the mine water treatment plant, the concentration of the fluoride in the stone Ge platform mine water needs to be predicted, 3-1 is mainly mined in the future, but the standard exceeding of the fluoride detected in a 3-1 coal goaf is up to 5.1mg/L, and the difference from the conventional knowledge is large. The rock Ge underground water-containing layer respectively comprises from top to bottom: the fourth is a Salacia diving aquifer, a Zodiac fissure aquifer and a Yanan fissure aquifer.
The application example adopts the method for predicting the fluoride concentration in the mine water based on the comparison method, and the method comprises the following steps:
step one, collecting and detecting a water sample in hydrogeological survey:
the method is characterized in that underground water samples and mine water samples of different aquifers are collected in hydrogeology compensation work, wherein the underground water samples and the mine water samples comprise 3 groups of atmospheric precipitation, 3 groups of surface river water, 3 groups of fourth series Zarausu water samples, 4 groups of Turo groups, 4 groups of Yanan groups, 5 groups of mine water and 23 groups in total. And respectively detecting the concentration of conventional ions, the concentration of fluoride and the value of hydrogen and oxygen isotopes in different types of water samples.
Step two, identifying the mine water burst source and quantitatively calculating the proportion of each source:
and (3) drawing a pipe three-line graph according to the concentrations of seven conventional ions in the water samples of different types, and judging the main water chemistry types of the water samples of different types as shown in figure 2.
As can be seen from FIG. 2, the water chemistry type of atmospheric precipitation and surface water is HCO3The water chemistry of the-Ca type, Saraku group is HCO3-Ca type and HCO3The water chemistry of-Na type, Yanan group and mine water is HCO3Na type, and the source of mine water is primarily judged to be underground water supply of the Zaumu group and the Yanan group from the water chemistry type.
Counting and calculating delta D and delta in different water samples18The average value of O is shown in table 1, each type of water stable isotope delta D (VSMOW) is between-114.00 ‰ and 87.15 ‰, delta18O (VSMOW) is between 14.70 per thousand and 12.01 per thousand, and the initial sources of underground water and mine water are both atmospheric precipitation. The average delta D of the Saraca and Saururus chinensis is-104.00 per mill, and the delta 18O is-13.85 per mill; the average delta D of the Yanan group is-102.95 ‰, delta18O is-13.81 per mill; the water average delta D of the mine is-103.00 ‰, delta18O is-13.60 per mill, and the average delta D and delta of the mine water are obvious18The O value is closest to the combined water of the Zaumu group and the Yanan group, and the main source of the mine water is further presumed to be the mixed water of the Zaumu group and the Yanan group
TABLE 1 different types of δ D and δ18O
And (3) judging that the main source of the mine water is groundwater supply of the Zaumu group and the Yanan group by combining the chemical characteristics of water and the analysis result of the stable hydrogen-oxygen isotope.
Based on the result of qualitative identification of the water source of the mine water, the mixing ratio of the underground water of the Zaucu group and the Yanan group is calculated quantitatively, and the delta is calculated18The settlement result shows that the underground water of the saladsu accounts for 26.4 percent of the mine water burst, the water content of the iii accounts for 73.6 percent of the mine water burst,
and step three, analyzing fluoride sources in mine water:
and (3) drawing a fluoride concentration box chart according to the concentrations of the fluorides in different types of water samples, and judging the main sources of the fluorides in the mine water as shown in a figure 3.
As can be seen from FIG. 3, the maximum fluoride concentration in the mine water was 3.71mg/L, the minimum fluoride concentration was 1.20mg/L, the average fluoride concentration was 1.93mg/L, and the average fluoride concentrations in the atmospheric precipitation, surface water, Salacia, Ortholo, and Yanan groups were 0.02mg/L, 0.18mg/L, 0.81mg/L, 0.28mg/L, 1.55mg/L, and 1.93mg/L, respectively, and therefore, it was judged that the fluorides in the mine water were mainly derived from the Salacia and Yanan groups, and mainly derived from the Yanan group.
And step four, predicting the fluoride concentration of the mine water:
the main source of fluoride in the mine water is Yanan group, so the concentration of fluoride in the mine water can be compared and predicted by using the total fluoride concentration of underground water of the Yanan group.
Firstly, according to the water burst proportion of mine water and the concentrations of fluorides of the Zaumsu group and the Yanan group, calculating the following concentrations of fluorides in the mine water before the mine water reacts with the rock in the goaf:
Cm＝26.4％×0.81mg/L+73.6％×1.55mg/L＝1.34mg/L
secondly, the concentration of the fluoride in the mine water of the unexplored area is predicted by utilizing the concentration of the mine water of the direct mine group
C＝K×Cm＝1.25×1.34mg/L＝1.68mg/L
Wherein Cm is 1.93 mg/L/1.55 mg/L1.25 mg/L
Therefore, the average fluoride concentration in the mine water in the unexplored area was finally predicted to be 1.68mg/L according to the comparative method.
Claims (2)
1. A method for predicting the fluoride concentration in mine water based on a comparison method is characterized by comprising the following steps:
step one, collecting and detecting a water sample in hydrogeological survey;
step two, identifying a mine water burst source and quantitatively calculating the proportion of each source;
analyzing the fluoride source in the mine water;
fourthly, predicting the fluoride concentration of the mine water;
step S41, the concentration of fluoride before mine water enters the goaf;
and step S42, the concentration of fluoride in the goaf after the mine water stays in the goaf for a period of time.
2. A method of predicting fluoride concentration in mine water based on a comparative method as claimed in claim 1, wherein the method comprises the steps of:
step one, collecting and detecting a water sample in hydrogeological survey:
collecting water samples of various aquifers, rock samples and mine water samples of a mined area during a mine hydrogeology compensation water pumping test;
detecting the concentration of fluoride in each aquifer water sample and the mine water sample; detecting stable hydrogen and oxygen isotopes in a water sample, wherein in a test result, delta D and delta18The detection precision of O is respectively +/-0.1 per mill and +/-0.02 per mill;
in the formula:
δ represents the per thousand deviation of the isotope ratio of the sample relative to the isotope ratio of the standard sample, in ‰;
Rasmplerepresenting the abundance of isotopes in the sample to be tested;
RVSMOWrepresents the abundance of isotopes in the international standard sample;
δ D represents the δ value of deuterium;
δ18o represents the delta value of oxygen 18;
detecting the components of the fluorine-containing minerals in the rock sample by adopting X-ray diffraction;
step two, identifying the mine water burst source and quantitatively calculating the proportion of each source:
analyzing the water chemistry characteristics of groundwater of different aquifers by means of a pipe three-line graph and an ion Schoeller graph, and counting and calculating delta D and delta of each type of water sample18Average value of O, comprehensive water chemistry characteristics, delta D and delta18Identifying a mine water source qualitatively by using the O relation; on the basis of the above, delta is18O is used as an identification parameter, the mine water source is divided, and the proportion of each water source is calculated through a formula II;
δO＝γA×δA+(1-γA)×δBformula II;
in the formula:
delta O is delta of mine water sample to be detected18O value, unit is per mill;
δAdelta of water sample of A aquifer18O value, unit is per mill;
δBis delta of a water-containing sample B18O value, unit is per mill;
γAis the proportion of the A aquifer;
and step three, analyzing fluoride sources in mine water:
according to the mass concentration of fluoride in different water samples of each aquifer, drawing fluoride concentration box graphs of different types of water samples, and judging the source of the fluoride according to the maximum value, the minimum value and the average value of the fluoride concentration in the different types of water samples;
and step four, predicting the fluoride concentration of the mine water:
according to the concentration of fluoride in an aquifer, the concentration of fluoride in mine water is predicted by using a comparison method, and the method comprises the following two steps:
step S41, the concentration of fluoride before mine water enters the goaf:
according to the source of the mine water and the concentration of fluoride in the aquifer of the water source of the water filling source, preliminarily calculating the concentration of fluoride before the mine water enters the goaf and reacts with the rock in the goaf through a formula III;
Cm＝γACA+γBCBformula III;
in the formula:
cm is the concentration of fluoride in the mine water before the mine water does not have water-rock interaction with the broken rock in the goaf;
γAand gammaBThe ratio of the water filling source of the aquifer A to the water filling source of the aquifer B to the mine water inflow is respectively;
CAand CBThe fluoride concentrations in the aqueous layers of A and B, respectively;
step S42, after the mine water stays in the goaf for a period of time, the concentration of fluorides in the goaf is as follows:
predicting the concentration of fluoride in the mine water of the unknown goaf by a formula IV according to the concentration of fluoride in the mine water of the goaf and the concentration of fluoride in an aquifer from which the fluoride is sourced in the excavation process by using a comparison method;
c ═ K Cm formula iv;
in the formula:
c is the concentration of fluoride in the mine water in the unknown goaf;
k is the ratio of the average concentration of fluoride in the mine water of the known goaf to the concentration of fluoride in the natural aquifer.
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