Method for measuring mineral content in talc ore

Abstract

The invention relates to the technical field of mineral separation, in particular to a method for determining the mineral content in talc ore, which comprises the following steps: 1, determining the contents of chemical components MgO and SiO2 by adopting a chemical method; 2, putting the ground sample at the bottom of the crucible into a heating furnace for heating, decomposing magnesite to lose CO2, volatilizing talc to lose H2O, cooling, taking out, and weighing; and 3, calculating the amount of burn-in and the contents of talc, magnesite and quartz in the sample. The method is suitable for the situation that the ore property is simple, main minerals are talc, magnesite and quartz, the content of other minerals is extremely low, and influences on tests and practical application are extremely small. Compared with a conventional method, the method is high in measurement speed, accurate and credible in obtained result and low in measurement cost.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing, and particularly relates to a method for determining the mineral content in talc ore. Background Art

[0002] The main minerals in talc ore are talc, magnesite and quartz, and the content of other minerals is extremely low, which has little effect on the accuracy of sample analysis. In mineral processing research and production, mineral content is an important basis for determining the economic value of ore, mineral processing technology and selection effect evaluation, so the determination of mineral content is very important. The currently commonly used X-ray diffraction analysis can determine the type of minerals, but the measured mineral content is semi-quantitative, and it is impossible to accurately measure the mineral content; using an optical microscope for measurement, the sample preparation is complicated, the measurement efficiency under the microscope is low, the measurement cost is high, and the measurement is not accurate enough. The present invention is based on the thermal analysis characteristics of carbonate minerals and the high-temperature dehydration characteristics of hydrous minerals, and uses the selectivity of thermal weight loss of magnesite, talc and quartz to quickly measure the mineral content in talc ore. It is easy to operate, saves time and effort, and provides support for the formulation of mineral processing technology and the determination of mineral processing indicators. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for determining the mineral content in talc ore, which has fast measuring speed, low cost and accurate and reliable results.

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

[0005] A method for measuring the mineral content in talc ore comprises the following steps:

[0006] Step 1: Grind the sample to -0.074 mm and determine its chemical composition MgO, SiO by chemical method. 2 Content C 样，MgO , C 样，SiO2 ;

[0007] Step 2: Place m grams of ground sample evenly at the bottom of the crucible and heat it in a heating furnace. The magnesite decomposes and loses CO. 2 , talc volatilizes and loses H 2 O, take it out after cooling and weigh it, record it as m';

[0008] Step 3: Calculation

[0009] 1) Loss on burning of sample: C 烧减 =(m-m') / m×100%

[0010] 2) The molecular formula of talc is Mg 3 [Si 4 O 10 ](OH) 2The atomic weights of the elements Mg, Si, O, and H are 24.31, 28.09, 16, and 1.01, respectively. The molecular weight of talc is 379.31, of which the mass percentage of MgO is 31.88%, SiO 2 Mass percentage 63.37%, burn-down i.e. H 2 O, mass percentage is 4.75%, the talc content in the sample is expressed as M 滑石 express;

[0011] The molecular formula of magnesite is MgCO 3 , the atomic weight of C element is 12.01, the molecular weight of magnesite is 84.32, of which the mass percentage of MgO is 47.81%, and the burning loss, i.e. CO 2 The mass percentage is 52.19%. The content of magnesite in the sample is expressed as M 菱镁矿 express;

[0012] The molecular formula of quartz is SiO 2 , its mass percentage is 100%, and the quartz content in the sample is M 石英 express;

[0013] The equations are as follows:

[0014] The minerals containing MgO in the sample are talc and magnesite, then C 滑，MgO +C 菱，MgO =C 样，MgO ;

[0015] If the sample contains talc and magnesite, then C 滑，烧减 +C 菱，烧减 =C 样，烧减 ;

[0016] The sample contains SiO 2 The minerals are talc and quartz, then C 滑石，SiO2 +C 石英，SiO2 =C 样，SiO2 ;

[0017] Substitute into the numerical solution of the equation system, then:

[0018] M 滑石 =(0.5219×C 样，MgO –0.4781×C 样，烧减 ) / 0.1437×100%;

[0019] M 菱镁矿 =(0.3188×C 样，烧减 –0.0475×C 样，MgO ) / 0.1437×100%;

[0020] M 石英 =(C 样，SiO2–0.6337×M 滑石 )×100%.

[0021] In the step 2, the heating furnace is heated at a rate of 10-15°C / min to 1050-1070°C for 120-130 minutes.

[0022] The burning loss is the weight loss caused by roasting, that is, the components volatilized at high temperature.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention is applicable to talc ore with simple ore properties. The main minerals in the ore are talc, magnesite and quartz. The content of other minerals is extremely low, less than 0.2%, and has little impact on the test and practical application. Compared with the conventional method, this method has fast measurement speed, low cost, and accurate and reliable results. DETAILED DESCRIPTION

[0025] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] A method for measuring the mineral content in talc ore comprises the following steps:

[0027] Step 1: Grind the sample to -0.074 mm and determine its chemical composition MgO, SiO by chemical method. 2 Content C 样MgO , C 样SiO2 ; The samples include talc, magnesite, and quartz monominerals;

[0028] Step 2: Place m grams of ground sample evenly at the bottom of a 100 mL crucible, place it in a heating furnace, and heat it to 1050°C at a rate of 10°C / min-15°C / min for 120min-130min. At this time, the magnesite decomposes and loses CO. 2 , talc volatilizes and loses H2 O, take it out after cooling and weigh it, record it as m';

[0029] Step 3: Calculation

[0030] 1) Loss on burning of sample (weight loss caused by roasting, i.e. components volatilized at high temperature): C 烧减 =(m-m') / m×100%

[0031] 2) The mineral composition of talc is: MgO mass percentage is 31.88%, SiO 2 The mass percentage is 63.37%, the burning loss mass percentage is 4.75%; the talc content in the sample is expressed as M 滑石 express;

[0032] The mineral composition of magnesite is: MgO mass percentage is 47.81%, and the burning mass percentage is 52.19; the magnesite content in the sample is expressed as M 菱镁矿 express;

[0033] SiO in Quartz 2 is 100%; the quartz content in the sample is expressed as M 石英 express;

[0034] The minerals containing MgO in the sample are talc and magnesite, then C 滑，MgO +C 菱，MgO =C 样，MgO ;

[0035] If the sample contains talc and magnesite, then C 滑，烧减 +C 菱，烧减 =C 样，烧减 ;

[0036] The sample contains SiO 2 The minerals are talc and quartz, then C 滑石，SiO2 +C 石英，SiO2 =C 样，SiO2 ;

[0037] Substituting the values, we get:

[0038] ①0.3188M 滑石 +0.4781M 菱镁矿 =C 样，MgO ;

[0039] ②0.0475M 滑石 +0.5219M 菱镁矿 =C 样，烧减 ;

[0040] ③0.6337M 滑石 +M 石英 =C 样，SiO2 ;

[0041] After rearranging ①×0.5219-②×0.4781, we get:

[0042] M 滑石 =(0.5219×C 样，MgO –0.4781×C 样，烧减 ) / 0.1437×100%;

[0043] After rearranging ②×0.3188-①×0.475, we get:

[0044] M 菱镁矿 =(0.3188×C 样，烧减 –0.0475×C 样，MgO ) / 0.1437×100%;

[0045] After sorting ③, we get:

[0046] M 石英 =(C 样，SiO2 –0.6337×M 滑石 )×100%.

[0047] Some low-grade talc or talc with complex composition contains silicate minerals such as tremolite and chlorite. For relatively complex talc ores containing tremolite and chlorite, the mineral content can be calculated by the same method as long as the content of each component and the burn loss in the mineral are known or measured. However, for samples with many mineral species, such as more than ten minerals with very complex composition, this method cannot calculate the content of some minerals or the calculation amount is too large. However, it is still effective for the determination of the content of the main minerals.

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0049] Example

[0050] Assume that the chemical composition of the sample is MgO, SiO 2 and loss on burn, respectively, with contents of C MgO , C SiO2 , C IL ; Among them, the burn-down is CO 2 and H 2 O, the contents of talc, magnesite and quartz in the sample were expressed as M 滑石 、M 菱镁矿 、M 石英 It means that MgO, SiO in talc 2 and the burning loss content is C 滑,MgO , C 滑,SiO2 , C 滑,烧减MgO and burning loss in magnesite are C 菱,MgO , C 菱,烧减 ; SiO in quartz 2 The amount is C 石,SiO2 .

[0051] Methods for measuring the mineral content of talc ore include:

[0052] Mix 8g, 1g, and 1g of talc, magnesite, and quartz, respectively, and determine the mineral composition of the mixed ore sample according to the method of the present invention. The measured mineral content is 79.7086% talc, 10.1127% magnesite, and 10.1787% quartz. The test result has a small error and meets the needs of testing and production. The specific steps are as follows:

[0053] Step 1: Grind the talc mixed ore sample to -0.074mm and determine its chemical composition MgO, SiO by chemical method. 2 Content C 样MgO =30.25%, C 样SiO2 =60.69%;

[0054] Step 2: Place the ground sample (m = 10 g) evenly at the bottom of a 100 mL crucible and place it in a heating furnace. Heat the temperature to 1050 °C at a rate of 10 °C / min-15 °C / min for 120 min-130 min. At this time, the magnesite decomposes and loses CO. 2 , talc volatilizes and loses H 2 O, take out and weigh after cooling, m'=9.0936g;

[0055] Step 3: Calculation

[0056] 1) Loss on burning of sample: C 烧减 =(m-m') / m×100%=(10-9.0936) / 10×100%=9.06%;

[0057] 2) M 滑石 =(0.5219×C 样，MgO –0.4781×C 样，烧减 ) / 0.1437×100%=(0.5219×0.3025-0.4781×0.0906) / 0.1437×100%=79.7086%;

[0058] M 菱镁矿 =(0.3188×C 样，烧减 –0.0475×C 样，MgO) / 0.14367197=(0.3188×0.0906-0.0475×0.3025) / 0.1437×100%=10.1127%;

[0059] M 石英 =C 样，SiO2 –0.6337M 滑石 =(0.6069-0.6337×79.7086%)×100%=10.1787%;

[0060] The test results show that the measurement error of this method is within 2%, the measurement error is small, and it meets the needs of testing and production.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and basic spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for measuring the mineral content in talc ore, characterized in that: The steps include: Step 1: Grind the sample to -0.074mm and use chemical methods to determine the content of MgO and SiO2 样，MgO , C 样，SiO2 ; Step 2: Place m grams of ground sample evenly at the bottom of the crucible and heat it in a furnace. Magnesite decomposes to lose CO2 and talc evaporates to lose H2O. After cooling, take out the sample and weigh it, which is recorded as m'. Step 3: Calculation 1) Loss on burning of sample: C 烧减 =(m-m') / m×100%; 2) The molecular formula of talc is Mg3[Si4O 10 ](OH)2, the atomic weights of the elements Mg, Si, O, and H are 24.31, 28.09, 16, and 1.01, and the molecular weight of talc is 379.31, of which the mass percentage of MgO is 31.88%, the mass percentage of SiO2 is 63.37%, and the mass percentage of H2O is 4.75%. The talc content in the sample is expressed as M 滑石 express; The molecular formula of magnesite is MgCO3, the atomic weight of C is 12.01, the molecular weight of magnesite is 84.32, the mass percentage of MgO is 47.81%, the mass percentage of CO2 is 52.19%, and the content of magnesite in the sample is expressed as M 菱镁矿 express; The molecular formula of quartz is SiO2, and its mass percentage is 100%. The quartz content in the sample is expressed as M. 石英 express; The equations are as follows: The minerals containing MgO in the sample are talc and magnesite, then C 滑，MgO +C 菱，MgO =C 样，MgO ; If the sample contains talc and magnesite, then C 滑，烧减 +C 菱，烧减 =C 样，烧减 ; The minerals containing SiO2 in the sample are talc and quartz, then C 滑石，SiO2 +C 石英，SiO2 =C 样，SiO2 ; Substitute into the numerical solution of the equation system, then: M 滑石 =(0.5219×C 样，MgO –0.4781×C 样，烧减 ) / 0.1437×100%; M 菱镁矿 =(0.3188×C 样，烧减 –0.0475×C 样，MgO ) / 0.1437×100%; M 石英 =(C 样，SiO2 –0.6337×M 滑石 )×100%。 2. A method for measuring the mineral content in talc ore according to claim 1, characterized in that: In the step 2, the heating furnace is heated at a rate of 10-15°C / min to 1050-1070°C for 120-130 minutes.

3. A method for measuring the mineral content in talc ore according to claim 1, characterized in that: The burning loss is the weight loss caused by roasting, that is, the components volatilized at high temperature.