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Method for continuously determining content of calcium oxide and magnesium oxide in bentonite

A determination method and calcium oxide technology are applied in the field of refractory materials, which can solve the problems of long process flow and high cost of analysis methods, and achieve the effects of saving drugs, reducing detection costs and low cost.

Inactive Publication Date: 2015-12-16
INNER MONGOLIA BAOTOU STEEL UNION
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  • Claims
  • Application Information

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Problems solved by technology

Solve the problem of long process and high cost of existing analysis methods

Method used

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  • Method for continuously determining content of calcium oxide and magnesium oxide in bentonite
  • Method for continuously determining content of calcium oxide and magnesium oxide in bentonite

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Embodiment Construction

[0030] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments.

[0031] 1. Method summary: Dissolve the sample in a polytetrafluoroethylene plastic beaker with hydrochloric acid (65%), nitric acid (67%)-hydrofluoric acid (40%), add perchloric acid to smoke, the smoke is clear, and a little smoke Invisible, test solution dried up. Add 10mL of hydrochloric acid (65%) and heat to dissolve the salts. Transfer the test solution to a 250mL volumetric flask, dilute to the mark and dissolve. Take two parts of 50mL solution, put them in two 250mL beakers respectively, add 50mL triethanolamine (12%) to one part, add 50mL water, add a little hydroxylamine hydrochloride, add 30mL potassium hydroxide solution (20%), appropriate amount of calcein , and titrate with EDTA standard solution until the fluorescent green disappears as the end point. Add 50mL triethanolamine (12%) to ano...

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Abstract

The invention discloses a method for continuously determining the content of calcium oxide and magnesium oxide in bentonite. According to the method, a bentonite sample is added to a polytetrafluoroethylene plastic beaker, another beaker is not filled with the bentonite sample and serves as a blank control, then hydrochloric acid and nitric acid-hydrofluoric acid are added for dissolution respectively, perchloric acid is added for smoking, then hydrochloric acid is added to heat and dissolve salt, test solutions are transferred to large volumetric flasks respectively and diluted to a constant-volume scale, each solution is split into two parts of solutions with equal quantities; triethanolamine, water and hydroxylamine hydrochloride are added sequentially to one of the sample and the blank control, a potassium hydroxide solution and an appropriate amount of calcein are added, an EDTA (ethylene diamine tetraacetic acid) standard solution is adopted for titration until fluorescent green disappearance, the volume is recorded, and the content of calcium oxide is calculated; triethanolamine, water and hydroxylamine hydrochloride are added sequentially to the other one of the sample and the blank control, an ammonia-ammonium chloride buffer solution and an appropriate amount of eriochrome black T indicator are added, the EDTA standard solution is adopted for titration until purple red turns into blue, the volume is recorded, and the content of magnesium oxide is calculated.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a continuous determination method for measuring calcium oxide and magnesium oxide in bentonite and clay by volumetric method. Background technique [0002] Bentonite is a kind of clay rock, also known as montmorillonite clay rock, often containing a small amount of illite, kaolinite, halloysite, chlorite, zeolite, quartz, feldspar, calcite, etc.; generally white, light yellow, Due to the change of iron content, it is light gray, light green, pink, brown red, brick red, gray black, etc.; it has waxy, earthy or greasy luster; some bentonites are loose like soil, and some are dense and hard. The main chemical components are silicon dioxide, aluminum oxide and water, and also contain iron, magnesium, calcium, sodium, potassium and other elements, Na 2 The content of O and CaO has a great influence on the physical and chemical properties and technological performance of bentonite....

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N21/79
Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION
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