GB/T 29916-2013Chemical analysis methods for lanthanum magnesium alloy (English PDF)

2.1

When a determination of two or more ingredients, the part of the two methods to analyze the range of 2 to overlap arbitration analysis.

2.2

Unless otherwise stated, the use of recognized analytical reagent only in the analysis; the water is distilled or deionized water or equivalent purity.

2.3

instruments shall be within the test period, its performance should meet the technical requirements of the test parameters indicators; common laboratory instruments, including titration

Tubes, single marking flask, single marking pipette.

3.1 Determination of Range

Determination of total rare earth range 15.00% 30.00%.

3.2 Principle of the method

The sample is dissolved in hydrochloric acid, ammonia precipitation of rare earth separating calcium and magnesium. After the precipitate was dissolved smoke desilication, with oxalic acid precipitation separation of rare earth iron will

Precipitation at 950 °C burning into oxides, constant weight, weighing determination of rare earth after cooling.

3.3 Reagents and materials

3.3.1

ammonium chloride.

3.3.2

hydrochloric acid (rho = 1.19g/mL).

3.3.3

hydrochloric acid (11).

3.3.4

Hydrogen peroxide (30%).

3.3.5

Ammonia (11).

3.3.6 ammonium chloride solution

2g ammonium chloride (3.3.1) dissolved in 100mL of water, ammonia (3.3.5) is adjusted to pH value of 9 to 10.

3.3.7

nitric acid (rho = 1.42g/mL).

3.3.8

perchloric acid (rho = 1.67g/mL).

3.3.9

hydrochloric acid (298).

3.3.10

oxalic acid solution (100g/L).

3.3.11

oxalic acid solution (20g/L).