A method for measuring the bulk density and porosity of salt minerals

Abstract

The present invention relates to a method for measuring the bulk density and porosity of salt minerals, and belongs to the technical field of salt chemical industry. Before sampling, the first ring knife and the aluminum box are weighed to obtain a first weight. The first ring knife after sampling and the aluminum box with the measured sample placed therein are weighed to obtain a second weight. The bulk density of the salt mineral is calculated according to the first weight, the second weight and the volume of the ring knife. The volumetric flask with the second sample placed therein is weighed to obtain a third weight. A solvent is added to the volumetric flask with the second sample placed therein. The volumetric flask with the added solvent is weighed to obtain a fourth weight. The porosity of the salt mineral is calculated according to the third weight, the fourth weight, the density of the solvent, the volume of the volumetric flask and the volume of the ring knife. Thus, the bulk density and porosity of the salt mineral can be measured simply, quickly and accurately, so as to solve the current situation that the method for measuring the bulk density and porosity of salt minerals is missing in the national standard and the industry standard, and meet the needs of enterprises for calculating salt mineral reserves.

Description

Technical Field

[0001] The invention relates to the technical field of salt chemical industry, in particular to a method for measuring bulk density and porosity of salt minerals. Background Art

[0002] Salt minerals are composed of aggregates of various complex salts and free water (mother liquor). Due to the presence of crystal water and free water, the process of measuring the bulk density and porosity of salt minerals has difficulties such as not being able to be heated at high temperatures, not being able to dissolve in water, and not being able to disturb the wet solid minerals to cause changes in volume. The porosity cannot be measured using the ring knife drying method like soil, nor can the pore volume be measured using water. At present, there is no national or industry standard for the determination of the bulk density and porosity of salt minerals, which brings certain difficulties to the determination of the bulk density and porosity of salt minerals. Therefore, finding a method for determining the bulk density and porosity of salt minerals is of great guiding significance for prospecting and mineral resource reserve assessment. Summary of the Invention

[0003] The purpose of the present invention is to provide a simple, fast and accurate method for determining the bulk density and porosity of salt minerals, so as to solve the current situation that there are no methods for determining the bulk density and porosity of salt minerals in national standards and industry standards, and meet the needs of enterprises for calculating salt mineral reserves.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A method for measuring bulk density and porosity of salt minerals, comprising:

[0006] Using a first ring knife to sample a measurement area once to obtain a first sample of the salt mineral, and placing the first sample in an aluminum box; before sampling, weighing the first ring knife and the aluminum box to obtain a first weight;

[0007] Determine whether the first sample is wet ore; if so, filter and dry the first sample to obtain a measurement sample; if not, directly use the first sample as the measurement sample; and place the measurement sample in the aluminum box;

[0008] Weighing the first ring cutter after sampling and the aluminum box containing the sample to obtain a second weight; calculating the bulk density of the salt mineral based on the first weight, the second weight, and the volume of the ring cutter;

[0009] Using a second ring cutter to sample the measurement area once to obtain a second sample of the salt mineral, and placing the second sample in a volumetric flask; weighing the volumetric flask containing the second sample to obtain a third weight; the volume of the second ring cutter is smaller than the volume of the volumetric flask;

[0010] adding a solvent to the volumetric flask containing the second sample until the solvent level stabilizes at the maximum scale line of the volumetric flask; weighing the volumetric flask containing the solvent to obtain a fourth weight; the second sample is insoluble in the solvent;

[0011] The porosity of the salt mineral is calculated according to the third weight, the fourth weight, the density of the solvent, the volume of the volumetric flask, and the volume of the ring cutter.

[0012] In some embodiments, filtering and drying the first sample to obtain a measurement sample specifically includes:

[0013] Using a vacuum pump and a filtration bottle to filter the first sample to obtain a filtered sample;

[0014] The filtered sample is dried in a constant temperature drying oven to obtain a measurement sample.

[0015] In some embodiments, the salt mineral includes Epsom salt and sodium chloride; when the salt mineral is Epsom salt, the drying temperature used during drying is 40 degrees Celsius; when the salt mineral is sodium chloride, the drying temperature used during drying is 105 degrees Celsius.

[0016] In some embodiments, calculating the bulk density of the salt mineral according to the first weight, the second weight, and the volume of the ring cutter specifically includes: using the first weight, the second weight, and the volume of the ring cutter as input, and using a bulk density calculation formula to calculate the bulk density of the salt mineral;

[0017] The bulk density calculation formula is:

[0018]

[0019] Wherein, ρ is the bulk density of the salt mineral; P2 is the second weight; P1 is the first weight; V 环 is the volume of the ring cutter.

[0020] In some embodiments, placing the second sample in the volumetric flask specifically includes: placing the second sample in the second ring knife into the volumetric flask using a brush.

[0021] In some embodiments, the solvent is benzene, xylene or liquid paraffin.

[0022] In some embodiments, calculating the porosity of the salt mineral according to the third weight, the fourth weight, the density of the solvent, the volume of the volumetric flask, and the volume of the ring cutter specifically includes: using the third weight, the fourth weight, the density of the solvent, the volume of the volumetric flask, and the volume of the ring cutter as input, and using a porosity calculation formula to calculate the porosity of the salt mineral;

[0023] The porosity calculation formula is:

[0024]

[0025] Wherein, Φ is the porosity of the salt mineral; P4 is the fourth weight; P3 is the third weight; ρ 溶剂 is the density of the solvent; V 容量瓶 is the volume of the volumetric flask; V 环 is the volume of the ring cutter.

[0026] In some embodiments, weighing is performed using an electronic scale.

[0027] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0028] The present invention is used to provide a method for measuring the bulk density and porosity of salt minerals. A first ring knife is used to perform a sampling in a measurement area to obtain a first sample of the salt mineral, and the first sample is placed in an aluminum box. Before sampling, the first ring knife and the aluminum box are weighed to obtain a first weight. The first ring knife after sampling and the aluminum box containing the measured sample are weighed to obtain a second weight. The bulk density of the salt mineral is calculated based on the first weight, the second weight and the volume of the ring knife. A second ring cutter is used to take a sample in the measuring area to obtain a second sample of the salt mineral, and the second sample is placed in a volumetric flask. The volumetric flask containing the second sample is weighed to obtain a third weight, and a solvent is added to the volumetric flask containing the second sample until the solvent liquid level stabilizes at the maximum scale line of the volumetric flask. The volumetric flask with the added solvent is weighed to obtain a fourth weight. The porosity of the salt mineral is calculated based on the third weight, the fourth weight, the density of the solvent, the volume of the volumetric flask and the volume of the ring cutter, thereby being able to simply, quickly and accurately determine the bulk density and porosity of the salt mineral, thereby resolving the current situation in which there is a lack of determination methods for the bulk density and porosity of salt minerals in national and industry standards, and meeting the needs of enterprises for calculating salt mineral reserves. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A flow chart of the assay method provided in Example 1 of the present invention;

[0031] Figure 2 Flow chart of bulk density determination provided in Example 1 of the present invention;

[0032] Figure 3 This is a flow chart of porosity determination provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a simple, fast and accurate method for determining the bulk density and porosity of salt minerals, so as to solve the current situation that there are no methods for determining the bulk density and porosity of salt minerals in national standards and industry standards, and meet the needs of enterprises for calculating salt mineral reserves.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1:

[0037] This embodiment is used to provide a method for measuring bulk density and porosity of salt minerals. Figure 1 As shown, the measurement method includes the process of measuring bulk density and the process of measuring porosity. Before starting the measurement, the tools that need to be prepared in this embodiment include: 5 sets of ring knives, the size parameters of the ring knives are φ70×52, the volume is 200ml, and an aluminum box is provided. The ring knives and aluminum box are used for sampling. Electronic scale TB-500g (accuracy of 0.01g) is used for weighing. A brush is used to collect all the samples in the ring knife to reduce the residual sample in the ring knife. A constant temperature drying oven is used for drying. A vacuum pump and a filter bottle are used to filter the wet sample to remove excess water. A volumetric flask with a volume of 250ml is used to hold samples and use it at a fixed volume.

[0038] like Figure 2 As shown, the bulk density determination process can include sampling - weighing - bulk density calculation, specifically including:

[0039] S1: Using a first ring cutter to sample a measurement area once to obtain a first sample of a salt mineral, and placing the first sample in an aluminum box; before sampling, weighing the first ring cutter and the aluminum box to obtain a first weight;

[0040] Specifically, before sampling, the first ring knife and the aluminum box are cleaned first, and after cleaning, the first ring knife and the aluminum box are weighed using an electronic scale to obtain a first weight.

[0041] When sampling, the first sample taken is required to be representative, that is, it can represent the original ore state of the entire measurement area. Specifically, the first ring knife can be used to take samples in a representative area to obtain the first sample and complete the sampling process.

[0042] After sampling, use a brush to transfer the first sample in the first ring knife to the aluminum box to reduce the residue of the first sample in the first ring knife. Use the first ring knife to put the first sample taken in the measurement area (i.e., salt field) into the aluminum box and take it to the laboratory.

[0043] S2: Determine whether the first sample is wet ore; if so, filter and dry the first sample to obtain a measurement sample; if not, directly use the first sample as the measurement sample; and place the measurement sample in the aluminum box;

[0044] When salt minerals are exposed to air for long periods of time, the mother liquor or water is dehydrated through sun exposure or air drying, forming dry-based minerals, also known as dry ore. When salt minerals are submerged in brine or infiltrated for long periods of time, the salt minerals absorb the mother liquor and retain brine between the pores of the crystals, forming wet-based minerals, also known as wet ore. Due to their different origins, the methods for determining the bulk density of these two types of ores differ. Therefore, after obtaining the first sample, it is necessary to determine whether it is wet or dry. If the first sample is wet, it requires filtration and drying. If it is dry, no further processing is required and subsequent weighing can be performed directly.

[0045] Among them, filtering and drying the first sample to obtain the measurement sample may include: using a vacuum pump and a filtration bottle to filter the first sample, after the filtration is completed, obtaining a filtered sample, and then using a constant temperature drying oven to dry the filtered sample to obtain the measurement sample.

[0046] The salt minerals of this embodiment include sodium chloride, epsom salt, sylvite, glauberite, and glauberite. Because salt minerals contain water of crystallization, the drying temperature should be fully considered during the drying process. Through reference, it was found that epsom salt begins to dehydrate when the temperature reaches 48.5°C. Therefore, in actual operation, the drying temperature of epsom salt is controlled at 40.0°C, and the drying temperature of sodium chloride is controlled at 105°C. Potassium mixed salt ore is a mixture of potassium chloride, epsom salt, and sodium chloride. Similarly, carnallite is a mixture of carnallite, epsom salt, and sodium chloride. Because minerals containing water of crystallization are easily dehydrated at too high a temperature, which affects the actual measured porosity results, the drying temperature of the mixture should be the same as the minimum drying temperature of the minerals containing water of crystallization. Therefore, the drying temperature of potassium mixed salt ore and carnallite ore should also be controlled at 40.0°C, that is, the drying temperature of sylvite, glauberite, and glauberite is controlled at 40.0°C. This embodiment solves the problem that the ore cannot be heated at high temperature by selecting an appropriate drying temperature.

[0047] Specifically, the salt minerals in this embodiment include epsom salt and sodium chloride. When the salt mineral is epsom salt, the drying temperature used is 40 degrees Celsius. When the salt mineral is sodium chloride, the drying temperature used is 105 degrees Celsius, which solves the problem of the ore not being able to be heated at high temperatures.

[0048] S3: Weighing the first ring cutter after sampling and the aluminum box containing the sample to obtain a second weight; calculating the bulk density of the salt mineral based on the first weight, the second weight, and the volume of the ring cutter;

[0049] In this embodiment, after sampling, the first ring knife after sampling and the aluminum box containing the sample are weighed using an electronic scale to obtain a second weight, thereby completing the weighing process. It should be noted that the first ring knife after sampling refers to the first ring knife after sampling is completed, and the first sample may remain inside the ring knife.

[0050] Among them, calculating the bulk density of salt minerals based on the first weight, the second weight and the volume of the ring cutter can include: taking the first weight, the second weight and the volume of the ring cutter as input, calculating the bulk density of the salt mineral using the bulk density calculation formula, and completing the bulk density calculation process.

[0051] The bulk density calculation formula used in this example is:

[0052]

[0053] In formula (1), ρ is the bulk density of salt minerals; P2 is the second weight; P1 is the first weight; V 环 is the volume of the ring cutter.

[0054] like Figure 3As shown in the figure, the porosity determination process includes sampling - weighing - volume determination - weighing - porosity calculation, specifically including:

[0055] S4: sampling the measurement area once using a second ring cutter to obtain a second sample of the salt mineral, and placing the second sample in a volumetric flask; weighing the volumetric flask containing the second sample to obtain a third weight; the volume of the second ring cutter is smaller than the volume of the volumetric flask;

[0056] It should be noted that the first ring cutter and the second ring cutter are both pre-prepared ring cutter tools. The reason for distinguishing between the first and the second is to make the description clearer.

[0057] Before sampling, clean the second ring knife.

[0058] When sampling, the second sample is required to be representative, that is, it can represent the original ore state of the entire measurement area. Specifically, a second ring knife can be used to take samples in a representative area to obtain the second sample and complete the sampling process.

[0059] Among them, placing the second sample in the volumetric flask can include: using a brush to place the second sample in the second ring cutter into the volumetric flask, so as to transfer all the second sample in the second ring cutter to the volumetric flask as much as possible, and avoid the second sample from remaining in the second ring cutter.

[0060] The volume of the second ring is smaller than the volume of the volumetric flask. The volume of the second ring can be 200ml, and the volume of the volumetric flask can be 250ml. Therefore, after the second sample is placed in the volumetric flask, the second sample should be below the 250ml scale line of the volumetric flask. Before placing the second sample in the volumetric flask, weigh the volumetric flask using an electronic scale to obtain the initial weight. After placing the second sample in the volumetric flask, weigh the volumetric flask with the sample using an electronic scale to obtain the third weight, completing the weighing process.

[0061] S5: adding a solvent to the volumetric flask containing the second sample until the solvent level stabilizes at the maximum scale line of the volumetric flask; weighing the volumetric flask containing the solvent to obtain a fourth weight; the second sample is insoluble in the solvent;

[0062] Since salt minerals dissolve in water, in order to measure the porosity of salt minerals, a solvent with stable physical properties, easy availability, and insoluble in salt minerals must be selected. In terms of solvent selection, considering that salt minerals are easily soluble in water, the solvent should be insoluble in salt minerals at room temperature, have stable physical properties, and be highly efficient. After consulting the literature, three solvents were selected: benzene, xylene, and liquid paraffin. The densities of the three solvents at different temperatures are shown in Table 1 below.

[0063] Table 1 Comparison of relative densities of benzene, xylene and liquid paraffin

[0064]

[0065] Salt minerals are insoluble in the above three solvents, so the solvent in this embodiment can be benzene, xylene, or liquid paraffin. However, considering that benzene is highly volatile and easily diffuses when exposed to air, large amounts of benzene can enter the body after inhalation or skin contact, causing acute and chronic benzene poisoning. Xylene has a pungent odor and is flammable, and is a low-toxic chemical. Liquid paraffin is odorless and tasteless at room temperature and has stable physical properties. Therefore, the solvent in this embodiment is preferably liquid paraffin.

[0066] When adding solvent to the volumetric flask being placed with the second sample, method used is: slowly add liquid paraffin into volumetric flask, continue to slowly add liquid paraffin in the process that bubble constantly disappears, make liquid paraffin fully fill the pore of salt mineral, no longer produce bubble and liquid level is stabilized to volumetric flask 250ml scale mark and no longer decline after, will no longer add liquid paraffin, complete constant volume process.Utilize electronic scale that the volumetric flask (i.e., the volumetric flask after adding solvent) after constant volume is weighed, obtain the 4th weight, complete weighing process.

[0067] S6: Calculate the porosity of the salt mineral according to the third weight, the fourth weight, the density of the solvent, the volume of the volumetric flask, and the volume of the ring cutter.

[0068] S6 may include: taking the third weight, the fourth weight, the density of the solvent, the volume of the volumetric flask, and the volume of the ring cutter as input, and calculating the porosity of the salt mineral using a porosity calculation formula to complete the porosity calculation process.

[0069] The porosity calculation formula used in this example is:

[0070]

[0071] In formula (2), Φ is the porosity of salt minerals; P4 is the fourth weight; P3 is the third weight; ρ 溶剂 is the density of the solvent; V 容量瓶 is the volume of the volumetric flask; V 环 is the volume of the ring cutter.

[0072] To further verify the measurement accuracy and reliability of the porosity measurement method of this embodiment, it was compared with a conventional soil porosity measurement method. The comparison results are shown in Table 2 below. Table 2 is a comparison table of measurement data for soil porosity measured by the conventional soil porosity measurement method and the porosity measurement method of this embodiment.

[0073] Table 2

[0074]

[0075] As can be seen from Table 2 above, the absolute errors of the two measurement methods are between ±1%, and the arithmetic mean of the absolute errors is 0.26%. The measurement results of the two measurement methods are basically consistent. Therefore, the experimental data can prove that the porosity results measured by the salt mineral porosity measurement method provided in this embodiment are reliable and have high measurement accuracy. From the above measurement process, it can be seen that the porosity measurement method provided in this embodiment can complete the porosity measurement of a single soil sample in less than 3 hours. In contrast, the traditional soil porosity measurement method takes longer to measure porosity and has poor timeliness. This proves that the porosity measurement method of this embodiment is highly efficient.

[0076] The porosity of salt minerals was measured using the measurement method of this embodiment. The measurement results are shown in Table 3 below.

[0077] Table 3

[0078] Sample number 1 2 3 4 5 6 7 8 9 10 average Porosity (%) 39.26 38.95 39.18 38.99 39.13 39.09 39.07 38.99 39.1 39.22 39.10

[0079] It can be seen from Table 3 above that the measurement results have good reproducibility and the data are stable.

[0080] The determination method provided in this embodiment can be used in geological exploration of salt minerals to determine the bulk density and porosity of core samples. The beneficial effects of this determination method include:

[0081] (1) The determination method is simple and rapid, the determination process is short and efficient, and the determination results are accurate.

[0082] (2) The method used in the early salt field porosity measurement was relatively crude and the measurement results were inaccurate. The method of this embodiment can correct the porosity of the salt field process parameter during production.

[0083] (3) The problem of the lack of a method for determining the bulk density and porosity of relevant salt minerals has been solved, and the salt lake mineral resource reserves can be calculated more accurately, which has important guiding significance for the long-term planning of enterprises.

[0084] (4) An organic solvent that can be used to determine the porosity of salt minerals was found.

[0085] A large number of experiments have shown that the determination method of this embodiment is simple, rapid, and efficient, and has good data stability and parallelism. The determination method is stable and feasible.

[0086] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for measuring bulk density and porosity of salt minerals, characterized in that: The determination method comprises: Using a first ring knife to sample a measurement area once to obtain a first sample of the salt mineral, and placing the first sample in an aluminum box; before sampling, weighing the first ring knife and the aluminum box to obtain a first weight; Determine whether the first sample is wet ore; if so, filter and dry the first sample to obtain a measurement sample; if not, directly use the first sample as the measurement sample; and place the measurement sample in the aluminum box; Weighing the first ring cutter after sampling and the aluminum box containing the sample to obtain a second weight; calculating the bulk density of the salt mineral according to the first weight, the second weight, and the volume of the ring cutter, specifically comprising: using the first weight, the second weight, and the volume of the ring cutter as input, and calculating the bulk density of the salt mineral using a bulk density calculation formula; The bulk density calculation formula is: Wherein, ρ is the bulk density of the salt mineral; P2 is the second weight; P1 is the first weight; V 环 is the volume of the ring cutter; Using a second ring cutter to sample the measurement area once to obtain a second sample of the salt mineral, and placing the second sample in a volumetric flask; weighing the volumetric flask containing the second sample to obtain a third weight; the volume of the second ring cutter is smaller than the volume of the volumetric flask; adding a solvent to the volumetric flask containing the second sample until the solvent level stabilizes at the maximum scale line of the volumetric flask; weighing the volumetric flask containing the solvent to obtain a fourth weight; the second sample is insoluble in the solvent; Calculating the porosity of the salt mineral according to the third weight, the fourth weight, the density of the solvent, the volume of the volumetric flask, and the volume of the ring cutter, specifically comprising: using the third weight, the fourth weight, the density of the solvent, the volume of the volumetric flask, and the volume of the ring cutter as input, and using a porosity calculation formula to calculate the porosity of the salt mineral; The porosity calculation formula is: Wherein, Φ is the porosity of the salt mineral; P4 is the fourth weight; P3 is the third weight; ρ 溶剂 is the density of the solvent; V 容量瓶 is the volume of the volumetric flask; V 环 is the volume of the ring cutter.

2. The measuring method according to claim 1, wherein The filtering and drying the first sample to obtain a test sample specifically includes: Using a vacuum pump and a filtration bottle to filter the first sample to obtain a filtered sample; The filtered sample is dried in a constant temperature drying oven to obtain a measurement sample.

3. The measuring method according to claim 1 or 2, characterized in that The salt minerals include epsom salt and sodium chloride; when the salt mineral is epsom salt, the drying temperature used during drying is 40 degrees Celsius; when the salt mineral is sodium chloride, the drying temperature used during drying is 105 degrees Celsius.

4. The measuring method according to claim 1, wherein Placing the second sample into the volumetric flask specifically includes: using a brush to place the second sample in the second ring knife into the volumetric flask.

5. The measuring method according to claim 1, wherein The solvent is benzene, xylene or liquid paraffin.

6. The measuring method according to claim 1, wherein Weigh using an electronic scale.

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