Method for determining mineral content in magnesite

Abstract

The invention relates to the technical field of mineral separation, in particular to a method for quantifying the content of minerals in magnesite, which comprises the following steps of: testing and determining the mass percentage contents of chemical components SiO2, CaO, Al2O3, Fe2O3 and MgO in a sample; placing the ground sample in a beaker, adding a hydrochloric acid aqueous solution, heating and dissolving, and quickly measuring the mineral content in the magnesite according to the dissolving characteristic of the carbonate minerals or oxides and the dissolving selectivity of the carbonate minerals, oxides, quartz and silicate minerals in hydrochloric acid, so that the operation is convenient, time and labor are saved, and the measurement accuracy is high. And a support is provided for formulation of a beneficiation process and determination of beneficiation indexes.

Description

Technical Field

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

[0002] The main minerals in magnesite ores in Liaoning are magnesite, dolomite, talc, quartz and chlorite, and contain a small amount of iron minerals. Some magnesite ores contain a small amount of tremolite minerals. In mineral processing research and production, mineral content is an important basis for determining the economic value of ore, mineral processing technology and evaluation of separation effect, so the determination of mineral content is very important. The 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 and identify low-content minerals. Generally, when the mineral content is less than 1%, it is possible that it cannot be detected or the error is greater; using optical microscopy for measurement, the sample preparation is complicated, the measurement efficiency under the microscope is low, and the measurement cost is high. At the same time, there is also the problem of being unable to measure quantitatively, and the data obtained is not accurate enough. 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 magnesite ore, so as to accurately determine the mineral content in magnesite ore.

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

[0005] A method for determining the mineral content in magnesite ore comprises the following steps:

[0006] Step 1: Sample testing

[0007] The sample was ground to -0.074 mm, and the mass percentage of the chemical components SiO2, CaO, Al2O3, Fe2O3, and MgO in the sample was determined by chemical analysis;

[0008] Step 2: Determine the dolomite and tremolite content in the sample

[0009] The ground sample is placed in a beaker, and hydrochloric acid aqueous solution is added, heated and dissolved, so that the crystal water of carbonate minerals, iron oxide minerals and silicate minerals dissolves into the liquid phase; after the solution is cooled, solid-liquid separation is performed, and the solid phase is dried at low temperature. The contents of SiO2, CaO, Al2O3, Fe2O3 and MgO in the solid phase are determined by chemical analysis. The calcium in the dolomite dissolves into the liquid phase, and the calcium in the tremolite remains in the dissolved solid phase. The dolomite content M in the sample is calculated based on the CaO content of the dissolved part of the ore. 白云石 , and then calculate the MgO content in the dolomite according to the dolomite content in the sample; calculate the tremolite content M according to the amount of CaO in the solid phase after solid-liquid separation after the sample is dissolved 透闪石, and then calculate the content of MgO and SiO2 in tremolite according to the content of tremolite in the sample;

[0010] Step 3: Determine the content of magnesite in the sample

[0011] The content of MgO in the sample was calculated based on the content of MgO in the sample and the content of MgO in the solid phase after acid dissolution. The content of MgO in the magnesite in the sample and the content of MgO in the dolomite were then calculated based on the content of MgO in the sample and the content of MgO in the dolomite. 菱镁矿 ;

[0012] Step 4: Determine the iron content of the hydrochloric acid-soluble iron oxide mineral or magnesite in the sample

[0013] According to the Fe2O3 content in the sample and the Fe2O3 content in the solid phase after solid-liquid separation after dissolution, calculate the isomorphous iron content SF of magnesium in the iron oxide mineral or carbonate soluble in hydrochloric acid in the sample 铁 ;

[0014] Step 5: Determine the content of talc minerals in the sample

[0015] Determine the Al2O3 content in the sample chlorite according to the Al2O3 content of the sample; calculate the SiO2 content in the chlorite and the MgO content in the chlorite according to the molecular weight of the chlorite fraction;

[0016] The content of talc mineral M in the sample is calculated based on the MgO content in the solid phase, the MgO content in tremolite and the MgO content in chlorite. 滑石 and the content of SiO2 in talc;

[0017] Step 6: Determine the content of quartz minerals in the sample

[0018] The content of quartz mineral in the sample is calculated based on the SiO2 content in the sample, chlorite, tremolite and talc: M 石英 ;

[0019] Step 7: Use formula M 绿泥石 =100%-M 菱镁矿 -M 白云石 -M 滑石 -M 石英 -M 透闪石 -SF 铁 Calculate the amount of chlorite mineral in the sample.

[0020] In the step 2, the sample is added to a hydrochloric acid aqueous solution and heated to 90-100° C. for 40-50 minutes to dissolve, and then the solution is cooled to below 40° C.; after the solution is separated into solid and liquid, the solid phase is dried at a low temperature of 120-130° C.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention is based on the dissolution characteristics of carbonate minerals or oxides and utilizes the selectivity of dissolving carbonate minerals or oxides in hydrochloric acid to quickly measure the mineral content in magnesite ore. The operation is convenient, time-saving and labor-saving, and provides support for the formulation of mineral processing technology and the determination of mineral processing indicators.

[0023] Compared with conventional methods, the measurement is fast, the results are accurate and reliable, and the measurement cost is low. DETAILED DESCRIPTION

[0024] 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.

[0025] A method for determining the mineral content in magnesite ore, the specific steps comprising:

[0026] It is known that the atomic weights of the atoms contained in the sample are shown in the table below.

[0027] atom Mg C Si Al Ca O H Atomic weight 24.31 12.01 28.09 26.98 40.08 16 1.01

[0028] After calculation, the molecular weight of MgO is 40.31, the molecular weight of CaO is 56.08, the molecular weight of SiO2 is 60.09, and the molecular weight of Al2O3 is 101.96;

[0029] The molecular weight of a mineral is the sum of its atomic weights, such as the molecular weight of magnesite is 24.31+12.01+16×3=84.32;

[0030] The content of a component in a mineral is the molecular weight of the component / the molecular weight of the mineral. For example, the content of MgO in magnesite is the molecular weight of MgO / the molecular weight of magnesite, that is, 40.31 / 84.32×100%=47.81%;

[0031] Step 1: Sample testing

[0032] The sample was ground to -0.074 mm and the mass percentages of the chemical components SiO2, CaO, Al2O3, Fe2O3 and MgO were determined and recorded as C 样SiO2 , C 样CaO , C 样Al2O3 , C 样Fe2O3 , C 样MgO ;

[0033] Step 2: Determine the dolomite and tremolite content in the sample

[0034] Place G grams of ground sample in a beaker, add 30-40 mL of 4-8 mol / L hydrochloric acid solution, heat at 90-100 ° C to dissolve, so that the crystal water in carbonate minerals in the sample, such as magnesite, dolomite and iron oxide minerals and some silicate minerals, dissolves into the liquid phase; heating time 40-50 minutes, then cool the solution to below 40 ° C; separate the solution into solid and liquid, and dry the solid phase at 120-130 ° C; weigh the solid phase after dissolution and solid-liquid separation and record it as G 固 , the content of SiO2, CaO, Al2O3, Fe2O3, and MgO in the solid phase is determined by chemical analysis, and is recorded as C 固SiO2 , C 固CaO , C 固Al2O3 , C 固Fe2O3 , C 固MgO ;

[0035] The calcium-containing minerals in the sample are dolomite and tremolite. The calcium in dolomite dissolves into the liquid phase, while the calcium in tremolite remains in the solid phase after the sample is dissolved. The molecular formula of dolomite is CaMg[CO3]2, i.e. CaCO3·MgCO3, and the molecular weight is 184.41. It is calculated that the mass percentage of CaO is 30.41%, the mass percentage of MgO is 21.86%, and the mass percentage of CO2 is 47.73%.

[0036] Then, the amount of CaO in the sample dolomite is the amount of CaO in the dissolved part: C 白,CaO =(G×C 样CaO -G 固 ×C 固,CaO ) / G

[0037] Dolomite content in the sample: M 白云石 =C 白,CaO / 0.3041×100%=(G×C 样CaO -G 固 ×C 固,CaO ) / G / 0.3041×100%;

[0038] MgO content in dolomite in the sample: C 白,MgO =M白云石 × 0.2186 = (G × C 样CaO -G 固 ×C 固,CaO ) / G / 0.3041×0.2186×100%;

[0039] The molecular formula of tremolite is Ca2Mg5[Si4O 11 ]2(OH)2, i.e. (CaO)2·(MgO)5·[SiO2]8·H2O, with a molecular weight of 812.45. Calculation shows that the CaO content is 13.81%, the MgO content is 24.81%, the SiO2 content is 59.17%, and the H2O content is 2.22%;

[0040] After the sample is dissolved and the solid-liquid is separated, the amount of CaO in the solid phase is the amount of CaO in the sample tremolite.

[0041] The content of CaO in tremolite in the sample: C 透,CaO =G 固 ×C 固CaO / G;

[0042] The mass of tremolite in the sample: M 透闪石 =C 透,CaO / 0.1381×100%=G 固 ×C 固CaO / G / 0.1381×100%;

[0043] The content of MgO in tremolite in the sample: C 透,MgO =M 透闪石 ×0.2481;

[0044] The content of SiO2 in tremolite in the sample: C 透,SiO2 =M 透闪石 ×0.5917;

[0045] Step 3: Determine the content of magnesite in the sample

[0046] The content of dissolved MgO in the sample = (G × C 样MgO -G 固 ×C 固MgO ) / G;

[0047] Since the magnesium minerals in the liquid phase are magnesite and dolomite, the content of MgO in the sample magnesite is:

[0048] C 菱MgO =(G×C 样MgO -G 固 ×C 固MgO ) / GC 白,MgO ;

[0049] The molecular formula of magnesite is MgCO3, and the molecular weight is 84.32. It is calculated that the mass percentage of MgO is 47.81%; the mass percentage of CO2 is 52.19%;

[0050] Then we have: The content of magnesite in the sample: M 菱镁矿 =C 菱MgO / 0.4781×100%;

[0051] Step 4: Determine the isomorphous iron content of hydrochloric acid-soluble iron oxide minerals or magnesite in the sample:

[0052] The iron content in the sample minus the iron in the solid phase is the isomorphous iron content SF of the iron oxide mineral or magnesite soluble in hydrochloric acid in the sample. 铁 ;

[0053] SF 铁 =(C 样Fe2O3 -G 固 ×C 固Fe2O3 / G);

[0054] Step 5: Determine the content of talc minerals in the sample

[0055] The molecular formula of chlorite is (R 2+ ,R 3+ )6[(Si,Al)4O 10 ]2(OH)8, the content of each component in chlorite fluctuates, but for chlorite in magnesite ore, the molar ratios of Al2O3 and SiO2, Al2O3 and MgO are relatively fixed, the molar ratio of Al2O3 and SiO2 is 1:2, the molar ratio of Al2O3 and MgO is 1:3.5, the fractional weights are Al2O3, SiO2 and MgO, and the molecular weights are 101.96, 60.09, and 40.30 respectively;

[0056] The only mineral containing Al2O3 in the sample is chlorite, then the content of Al2O3 in the sample chlorite is:

[0057] C 绿Al2O3 =C 样Al2O3 ;

[0058] The content of SiO2 in chlorite in the sample: C 绿SiO2 =C 样Al2O3 / 101.96×60.09×2;

[0059] The content of MgO in chlorite in the sample: C 绿MgO =C 样Al2O3 / 101.96×40.30×3.5;

[0060] After dissolution and solid-liquid separation, chlorite, tremolite and talc in the solid phase all contain MgO. The content of MgO in the sample talc is:

[0061] C 滑MgO =G 固 C 固MgO / GC 绿MgO -C 透MgO；

[0062] The molecular formula of talc is Mg3[Si4O 10 ](OH)2, i.e. (MgO)3·[SiO2]4·H2O, has a molecular weight of 379.31. Calculation shows that the mass percentage of MgO is 31.88%, the mass percentage of SiO2 is 63.37%; the mass percentage of H2O is 4.75%;

[0063] Then: The content of talc mineral in the sample: M 滑石 =C 滑MgO / 0.3188×100%;

[0064] The content of SiO2 in talc in the sample: C 滑SiO2 =M 滑石 ×0.6337;

[0065] Step 6: Determine the content of quartz minerals in the sample

[0066] The molecular formula of quartz is SiO2, of which the mass percentage of SiO2 is 100.00%;

[0067] After dissolution and solid-liquid separation, chlorite, tremolite, talc and quartz in the solid phase all contain SiO2, so:

[0068] The content of quartz mineral in the sample: M 石英 =(C 样SiO2 -C 绿SiO2 -C 滑SiO2 -C 透SiO2 );

[0069] Step 7: Determine the content of chlorite mineral in the sample:

[0070] M 绿泥石 =100%-M 菱镁矿 -M 白云石 -M 滑石 -M 石英 -M 透闪石 -SF 铁 .

[0071] 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.

[0072] Example

[0073] The contents of chemical components SiO2, CaO, Al2O3, Fe2O3 and MgO in the sample are respectively recorded as C 样SiO2 , C 样CaO , C 样Al2O3 , C 样Fe2O3 , C 样MgO ;

[0074] The mineral contents of magnesite, dolomite, talc, quartz, chlorite and tremolite in the sample are recorded as M 菱镁矿 、M 白云石 、M 滑石 、M 石英 、M 绿泥石 、M 透闪石 ;

[0075] The isomorphous iron content of iron minerals or magnesite soluble in hydrochloric acid oxidation is recorded as SF 铁 ;

[0076] Example 1

[0077] A method for determining the mineral content in magnesite ore, the specific steps comprising:

[0078] Mix 9g, 0.2g, 0.2g, 0.5g, 0.1g of magnesite, dolomite, talc, quartz, and chlorite, and measure the mineral composition of the mixed ore sample according to the method of the present invention. The measured mineral content is 89.6801% of magnesite, 2.0059% of dolomite, 2.0428% of talc, 5.0629% of quartz, 1.0104% of chlorite, and 0.1978% of SF. The test result has a small error and meets the needs of experiment and production. The specific steps are as follows:

[0079] Step 1: Sample testing

[0080] 10g of sample was ground to -0.074mm, and the mass percentages of chemical components SiO2, CaO, Al2O3, Fe2O3, and MgO were determined, which were C 样SiO2 =6.77%, C 样CaO =0.61%, C 样Al2O3 =0.35%, C 样Fe2O3 =0.23%, C 样MgO =44.45%;

[0081] Step 2: Determine the dolomite and tremolite content in the sample

[0082] Place 10g of the ground sample in a beaker, add 40mL of 8mol / L hydrochloric acid solution, heat at 90℃ to dissolve, so that the crystal water in the carbonate minerals in the sample, such as magnesite, dolomite and iron oxide minerals and some silicate minerals, dissolves into the liquid phase; heat for 50min, then cool the solution to below 40℃; separate the solution into solid and liquid, dry the solid phase at 120℃; weigh the solid phase and record it as G 固 =0.7662g, the contents of SiO2, CaO, Al2O3, Fe2O3 and MgO in the solid phase are determined by chemical analysis and recorded as C 固SiO2 =88.21%, C 固CaO =0, C 固Al2O3 =4.55%, C 固Fe2O3 =0.42%, C 固MgO =14.82%;

[0083] After the sample is dissolved and the solid-liquid is separated, the CaO content in the solid phase is 0, so the sample does not contain tremolite. The only calcium-containing mineral in the sample is dolomite. From the molecular formula of dolomite, CaMg[CO3]2, it can be seen that the mass percentage of CaO is 30.41%, the mass percentage of MgO is 21.86%, and the mass percentage of CO2 is 47.73%.

[0084] The content of CaO in the sample dolomite is C 样CaO =0.61%;

[0085] Dolomite content in the sample: M 白云石 =C 白,CaO / 0.3041×100%=2.0059%;

[0086] MgO content in dolomite in the sample:

[0087] C 白,MgO =M 白云石 × 0.2186 = 2.0059% × 0.2186 = 0.4385%;

[0088] Step 3: Determine the content of magnesite in the sample

[0089] The content of dissolved MgO in the sample = (G × C 样MgO -G 固 ×C 固MgO ) / G = (10 × 44.25% - 0.7662 × 14.82) / 10 = 43.11%

[0090] Since the magnesium-containing minerals in the liquid phase are magnesite and dolomite, the content of MgO in the sample magnesite is:

[0091] C 菱MgO =(G×C 样MgO-G 固 ×C 固MgO ) / GC 白,MgO =43.11%-0.4385%=42.8761%

[0092] The molecular formula of magnesite is MgCO3, which shows that the mass percentage of MgO is 47.81%; the mass percentage of CO2 is 52.19%;

[0093] Then: The content of magnesite in the sample: M 菱镁矿 =C 菱MgO / 0.4781=42.8761% / 0.4781

[0094] =89.6801%;

[0095] Step 4: Determine the isomorphous iron content of the sample that is soluble in hydrochloric acid oxidized iron minerals or magnesite:

[0096] SF 铁 =C 样Fe2O3 -G 固 ×C 固Fe2O3 / G = (0.23% - 0.7662 × 0.42% / 10) = 0.1978%;

[0097] Step 5: Determine the content of talc minerals in the sample

[0098] The molecular formula of chlorite is (R 2+ ,R 3+ )6[(Si,Al)4O 10 ]2(OH)8, the content of each component in chlorite fluctuates, but for chlorite in magnesite ore, the molar ratios of Al2O3 and SiO2, Al2O3 and MgO are relatively fixed, the molar ratio of Al2O3 and SiO2 is 1:2, the molar ratio of Al2O3 and MgO is 1:3.5, the fractional weights are Al2O3, SiO2 and MgO, and the molecular weights are 101.96, 60.09, and 40.30 respectively;

[0099] The only mineral containing Al2O3 in the sample is chlorite, then the content of Al2O3 in the sample chlorite is:

[0100] C 绿Al2O3 =C 样Al2O3 =0.35%;

[0101] The content of SiO2 in chlorite in the sample:

[0102] C 绿SiO2 =C 样Al2O3 / 101.96×60.09×2=0.35% / 101.96×60.09×2=0.4125%;

[0103] The content of MgO in chlorite in the sample:

[0104] C 绿MgO =C 样Al2O3 / 101.96×40.30×3.5=0.35% / 101.96×40.30×3.5=0.4842%;

[0105] After dissolution and solid-liquid separation, both chlorite and talc in the solid phase contain MgO. The MgO content in the sample talc is:

[0106] C 滑MgO =G 固 C 固MgO / GC 绿MgO -C 透MgO =0.7662×14.82% / 10-0.4842-0=0.6512%

[0107] The molecular formula of talc is Mg3[Si4O 10 ](OH)2, it can be seen that the mass percentage of MgO is 31.88%, the mass percentage of SiO2 is 63.37%; the mass percentage of H2O is 4.75%;

[0108] Then there is: The content of talc mineral in the sample:

[0109] M 滑石 =C 滑MgO / 0.3188=0.6512% / 0.3188=2.0428%;

[0110] The content of SiO2 in talc in the sample: C 滑SiO2 =M 滑石 × 0.6337 = 2.0428% × 0.6337 = 1.2945%;

[0111] Step 6: Determine the content of quartz minerals in the sample

[0112] The molecular formula of quartz is SiO2, of which the mass percentage of SiO2 is 100.00%;

[0113] After dissolution and solid-liquid separation, chlorite, talc and quartz in the solid phase all contain SiO2, so:

[0114] Content of quartz minerals in the sample:

[0115] M 石英 =C 样SiO2 -C 绿SiO2 -C 滑SiO2 -C 透SiO2=6.77%-0.4125%-1.2945%-0=5.0629%;

[0116] Step 7: Determine the content of chlorite mineral in the sample:

[0117] M 绿泥石 =100%-M 菱镁矿 -M 白云石 -M 滑石 -M 石英 -M 透闪石 -SF 铁

[0118] =100%-89.6801%-2.0059%-2.0428%-5.0629%-0-0.1978%=1.0104%.

[0119] Example 2

[0120] A method for determining the mineral content in magnesite ore, the specific steps comprising:

[0121] Mix 9g, 0.3g, 0.3g, 0.2g, 0.1g, 0.1g of magnesite, dolomite, talc, quartz, chlorite, and tremolite single minerals, and determine the mineral composition of the mixed ore sample according to the method of the present invention. Determine the mineral composition of the mixed ore sample according to the method of the present invention. The measured mineral content is 89.6988% of magnesite, 3.0200% of dolomite, 3.0491% of talc, 2.0531% of quartz, 1.0081% of chlorite, 1.0255% of tremolite, and 0.1454% of SF. The test result has a small error and meets the needs of experiment and production. The specific steps are as follows:

[0122] Step 1: Sample testing

[0123] 10g of sample was ground to -0.074mm, and the mass percentages of chemical components SiO2, CaO, Al2O3, Fe2O3, and MgO were determined, which were C 样SiO2 =4.71%, C 样CaO =1.06%, C 样Al2O3 =0.10%, C 样Fe2O3 =0.21%, C 样MgO =44.91%;

[0124] Step 2: Determine the content of dolomite and tremolite in the sample

[0125] Place 10g of the ground sample in a beaker, add 50mL of 8mol / L hydrochloric acid aqueous solution and heat at 100℃ to dissolve the carbonate minerals in the sample, such as magnesite, dolomite and iron oxide minerals, and the crystal water in some silicate minerals into the liquid phase; heat for 45min, then cool the solution to below 40℃; separate the solution into solid and liquid, and dry the solid phase at 125℃; weigh and record it as G 固 =0.6587g, the contents of SiO2, CaO, Al2O3, Fe2O3 and MgO in the solid phase are determined by chemical analysis and recorded as C 固SiO2 =71.58%, C 固CaO =2.15%, C 固Al2O3 =1.59%, C 固Fe2O3 =0.98%, C 固MgO =20.72%;

[0126] From the molecular formula of dolomite, CaMg[CO3]2, we can know that the mass percentage of CaO is 30.41%; the mass percentage of MgO is 21.86%; the mass percentage of CO2 is 47.73%; if there is tremolite in the sample, the calcium-containing minerals in the sample are dolomite and tremolite. Because the calcium in the dolomite dissolves into the liquid phase, the calcium in the tremolite remains in the solid phase after the sample is dissolved and the solid-liquid separation occurs.

[0127] Then, the amount of CaO in the sample dolomite is the amount of CaO in the dissolved part: C 白,CaO =(G×C 样，CaO -G 固 ×C 固,CaO ) / G = (10 × 1.06% - 0.6587 × 2.15%) / 10 = 9.2%

[0128] Dolomite content in the sample: M 白云石 =C 白,CaO / 0.3041×100%=9.2% / 0.3041=3.0200%;

[0129] MgO content in dolomite in the sample: C 白,MgO =M 白云石 × 0.2186 = 3.0200% × 0.2186

[0130] =0.6602%;

[0131] The molecular formula of tremolite is Ca2Mg5[SiO 11 ]2(OH)2, of which CaO content is 13.81%, MgO content is 24.81%, SiO2 content is 59.17%, and H2O content is 2.22%;

[0132] After the sample is dissolved and the solid-liquid is separated, the amount of CaO in the solid phase is the amount of CaO in the sample tremolite.

[0133] The content of CaO in the sample tremolite: C 透,CaO =G 固 ×C 固CaO / G=0.6587×2.15% / 10=0.1416%;

[0134] The content of tremolite in the sample M 透闪石 =C 透,CaO / 0.1381=0.1416%; / 0.1381=1.0255%;

[0135] MgO content in sample tremolite: C 透,MgO =M 透闪石 × 0.2481 = 1.0255% × 0.2481 = 0.2544%;

[0136] Content of SiO2 in sample tremolite: C 透,SiO2 =M 透闪石 × 0.5917 = 1.0255% × 0.5917

[0137] =0.6068%;

[0138] Step 3: Determine the content of magnesite in the sample

[0139] The content of dissolved MgO in the sample = (G × C 样MgO -G 固 ×C 固MgO ) / G

[0140] =(10×44.91%-0.6587×20.72%) / 10=43.55%

[0141] Since the magnesium-containing minerals in the liquid phase are magnesite and dolomite, the content of MgO in the sample magnesite is:

[0142] C 菱MgO =(G×C 样MgO -G 固 ×C 固MgO ) / G×100%-C 白,MgO =43.55%-0.6602%=42.8850%;

[0143] The molecular formula of magnesite is MgCO3, which shows that the mass percentage of MgO is 47.81%; the mass percentage of CO2 is 52.19%;

[0144] Then there is: The content of magnesite in the sample:

[0145] M菱镁矿 =C 菱MgO / 0.4781=42.8850% / 0.4781=89.6988%

[0146] Step 4: Determine the isomorphous iron content of the sample that is soluble in hydrochloric acid oxidized iron minerals or magnesite:

[0147] SF 铁 =(C 样Fe2O3 -G 固 ×C 固Fe2O3 / G) = 0.21% - 0.6587 × 0.98% / 10 = 0.1454%

[0148] Step 5: Determine the content of talc minerals in the sample

[0149] The molecular formula of chlorite is (R 2+ ,R 3+ )6[(Si,Al)4O 10 ]2(OH)8, the content of each component in chlorite fluctuates, but for chlorite in magnesite ore, the molar ratios of Al2O3 and SiO2, Al2O3 and MgO are relatively fixed, the molar ratio of Al2O3 and SiO2 is 1:2, the molar ratio of Al2O3 and MgO is 1:3.5, the fractional weights are Al2O3, SiO2 and MgO, and the molecular weights are 101.96, 60.09, and 40.30 respectively;

[0150] The only mineral containing Al2O3 in the sample is chlorite, then the content of Al2O3 in the sample chlorite is:

[0151] C 绿Al2O3 =C 样Al2O3 =0.10%;

[0152] The content of SiO2 in chlorite in the sample:

[0153] C 绿SiO2 =C 样Al2O3 / 101.96×60.09×2=0.10% / 101.96×60.09×2=0.1179%;

[0154] The content of MgO in chlorite in the sample: C 绿MgO =C 样Al2O3 / 101.96×40.30×3.5×100%=0.10% / 101.96×40.30×3.5=0.1383%;

[0155] If there is tremolite in the sample, and after dissolution and solid-liquid separation, the solid phase contains chlorite, tremolite and talc, and the MgO content in the sample talc is:

[0156] C 滑MgO =G 固 C 固MgO / G×100%-C 绿MgO -C 透MgO

[0157] =0.6587×20.72% / 10-0.1383%-0.2544%=0.9721%;

[0158] The molecular formula of talc is Mg3[Si4O 10 ](OH)2, it can be seen that the mass percentage of MgO is 31.88%, the mass percentage of SiO2 is 63.37%; the mass percentage of H2O is 4.75%;

[0159] Then there is: The content of talc mineral in the sample:

[0160] M 滑石 =C 滑MgO / 0.3188=0.9721% / 0.3188=3.0491%

[0161] The content of SiO2 in talc in the sample:

[0162] C 滑SiO2 =M 滑石 × 0.6337 = 3.0491% × 0.6337 = 1.9322%;

[0163] Step 6: Determine the content of quartz minerals in the sample

[0164] The molecular formula of quartz is SiO2, of which the mass percentage of SiO2 is 100.00%;

[0165] If there is tremolite in the sample, after dissolution and solid-liquid separation, chlorite, tremolite, talc and quartz in the solid phase all contain SiO2, then:

[0166] Content of quartz minerals in the sample:

[0167] M 石英 =C 样SiO2 -C 绿SiO2 -C 滑SiO2 -C 透SiO2 =4.71%-0.1179%-1.9322%-0.6068%=2.0531%

[0168] Step 7: Determine the content of chlorite mineral in the sample:

[0169] M 绿泥石 =100%-M 菱镁矿 -M 白云石 -M 滑石-M 石英 -M 透闪石 -SF 铁

[0170] =100%-89.6988%-3.0200%-3.0491%-2.0531%-1.0255%-0.1454%=1.0081%.

[0171] The measurement results show that the measurement error of this method is within 3%, the measurement error is small, and it meets the needs of testing and production.

[0172] 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 determining the mineral content in magnesite ore, characterized in that: The following steps are involved: Step 1: Sample testing The sample was ground to -0.074 mm, and the mass percentage of the chemical components SiO2, CaO, Al2O3, Fe2O3, and MgO in the sample was determined by chemical analysis; Step 2: Determine the dolomite and tremolite content in the sample The ground sample is placed in a beaker, and hydrochloric acid aqueous solution is added, heated and dissolved, so that the crystal water of carbonate minerals, iron oxide minerals and silicate minerals dissolves into the liquid phase; after the solution is cooled, solid-liquid separation is performed, and the solid phase is dried at low temperature. The contents of SiO2, CaO, Al2O3, Fe2O3 and MgO in the solid phase are determined by chemical analysis. The calcium in the dolomite dissolves into the liquid phase, and the calcium in the tremolite remains in the dissolved solid phase. The dolomite content M in the sample is calculated based on the CaO content of the dissolved part of the ore. 白云石 , and then calculate the MgO content in the dolomite according to the dolomite content in the sample; calculate the tremolite content M according to the amount of CaO in the solid phase after solid-liquid separation after the sample is dissolved 透闪石 , and then calculate the content of MgO and SiO2 in tremolite according to the content of tremolite in the sample; Step 3: Determine the content of magnesite in the sample The content of MgO in the sample was calculated based on the content of MgO in the sample and the content of MgO in the solid phase after acid dissolution. The content of MgO in the magnesite in the sample and the content of MgO in the dolomite were then calculated based on the content of MgO in the sample and the content of MgO in the dolomite. 菱镁矿 ; Step 4: Determine the iron content of the hydrochloric acid-soluble iron oxide mineral or magnesite in the sample According to the Fe2O3 content in the sample and the Fe2O3 content in the solid phase after solid-liquid separation after dissolution, calculate the isomorphous iron content SF of magnesium in the iron oxide mineral or carbonate soluble in hydrochloric acid in the sample 铁 ; Step 5: Determine the content of talc minerals in the sample Determine the Al2O3 content in the sample chlorite according to the Al2O3 content of the sample; calculate the SiO2 content in the chlorite and the MgO content in the chlorite according to the molecular weight of the chlorite fraction; The content of talc mineral M in the sample is calculated based on the MgO content in the solid phase, the MgO content in tremolite and the MgO content in chlorite. 滑石 and the content of SiO2 in talc; Step 6: Determine the content of quartz minerals in the sample The content of quartz mineral in the sample is calculated based on the SiO2 content in the sample, chlorite, tremolite and talc: M 石英 ; Step 7: Use formula M 绿泥石 =100%-M 菱镁矿 -M 白云石 -M 滑石 -M 石英 -M 透闪石 -SF 铁 Calculate the amount of chlorite mineral in the sample.

2. The method for determining the mineral content in magnesite according to claim 1, characterized in that: In the step 2, the sample is added to a hydrochloric acid aqueous solution and heated to 90-100° C. for 40-50 minutes to dissolve, and then the solution is cooled to below 40° C.; after the solution is separated into solid and liquid, the solid phase is dried at a low temperature of 120-130° C.