A method for measuring magnesium oxide content in manganese ore
A technology of magnesium oxide and manganese ore, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of easy adsorption of other ions, cumbersome operation, and accuracy of magnesium oxide results Poor problems, to achieve the effect of low cost, accurate results, high accuracy and precision of results
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Embodiment 1
[0027] First prepare the main reagents:
[0028] ① 0.02mol / L disodium ethylenediaminetetraacetic acid (EDTA) standard solution: Weigh 8g of AR grade disodium ethylenediaminetetraacetic acid and dissolve it in water, dilute to 1000mL with water, and mix well. Calibration shall be carried out according to GB / T601. ②Sodium hydroxide solution: 200g / L, 20g / L; ethylene glycol diethyl ether diammonium tetraacetic acid (EGTA) solution: 70g / L; phenylglycolic acid solution: 50g / L; triethanolamine solution: 1+1; hydrochloric acid Solution: 1+9; ammonia solution: 2+3. ③Acid chrome blue K-naphthol green B indicator: Weigh 0.1g of AR grade acid chrome blue K, weigh 0.1g of AR grade naphthol green B, weigh 20g of AR grade chlorine Potassium chloride is placed in a mortar, thoroughly ground and mixed. ④ pH=10 ammonia water-ammonium chloride buffer solution: Weigh 67.5g of AR grade ammonium chloride, dissolve it in water, add 570mL of AR grade ammonia water, dilute to 1000mL with water, and...
Embodiment 2
[0036] On the basis of the experimental method of embodiment 1,
[0037] Weigh about 0.12g sample, weigh to an accuracy of 0.0001g, place it in a 250mL beaker, add 5mL sulfuric acid-phosphoric acid, gradually raise the temperature to 320°C, cover the watch glass, keep the temperature in the beaker, and white smoke will vacate. From the bottom of the cup After cooling, rinse the watch glass and the inner wall of the beaker with 18mL of water, add 10mL of phenylglycolic acid, stir well, add 32mL of ethylene glycol diethyl ether diammonium tetraacetic acid (EGTA), stir the solution until the purple color disappears and becomes colorless Finally, add 35mL triethanolamine, stir for a while, add 12mL dextrin, add two drops of malachite green indicator solution, neutralize with sodium hydroxide solution until the solution is colorless, then add 4mL in excess, heat the solution to 85°C, and precipitate When agglomerated, filter with a funnel lined with sponge ball filter pulp, wash ...
Embodiment 3
[0044] On the basis of the experimental method of embodiment 1,
[0045] Weigh about 0.15g sample, weigh to an accuracy of 0.0001g, place it in a 250mL beaker, add 5mL sulfuric acid-phosphoric acid, gradually raise the temperature to 350°C, cover the watch glass, keep the temperature in the beaker, and white smoke will vacate. Take it off after 1 / 3~2 / 3 from the bottom of the cup, rinse the watch glass and the inner wall of the beaker with 20mL water after cooling, add 15mL phenylglycolic acid, after fully stirring, add 35mL ethylene glycol diethyl ether diammonium tetraacetic acid (EGTA) , fully stir the solution until the purple color disappears and becomes colorless, add 40mL of triethanolamine, stir for a while, add 15mL of dextrin, add two drops of malachite green indicator solution, neutralize with sodium hydroxide solution until the solution is colorless, then add 5mL , heat the solution to a temperature of 90°C, and when the precipitate is agglomerated, filter it with a...
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