GB/T 3884.17-2014Methods for chemical analysis of copper concentrates - Part 17: Determination of aluminium oxide content - Chromazurol S spectrophotometric method and fluoride salts device-Na2EDTA titrimetric method (English PDF)

2.1 Method summary

Sample with sodium hydroxide and sodium peroxide melt, melt with the flooding, most of copper, iron, nickel, calcium, magnesium, lead, titanium, etc. to precipitate

Forms is removed by filtration. Respectively thiourea, ascorbic acid masking remnants of copper, iron, vanadium eliminate interference with hydroxylamine hydrochloride at pH 5.8 to 6.3

Acetic acid - ammonium acetate buffer solution, aluminum and CAS S- nonionic surfactant polyethylene glycol octylphenyl ether (emulsifier OP) formed Green

Ternary complex, in the spectrophotometer at a wavelength of 610nm, the absorbance was measured with a 1cm cuvette, calculated using the standard curve method trioxide

Aluminum content.

2.2 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.

2.2.1

sodium peroxide.

2.2.2

sodium hydroxide.

2.2.3

hydrochloric acid (rho = 1.19g/mL).

2.2.4

hydrochloric acid (11).

2.2.5

hydrochloric acid (15).

2.2.6

hydrochloric acid (119).

2.2.7

hydrochloric acid (1119).

2.2.8

ammonia (16).

2.2.9

Ammonia (1139).

2.2.10

Thiourea (30g/L).

2.2.11 ascorbic acid solution (10g/L)

Using now.

2.2.12 hydroxylamine hydrochloride solution (100g/L)

Using now.

2.2.13 chrome azure S solution (1g/L)

Weigh 0.2g Chromium Azure dissolved in 200mL of ethanol (11) in.

2.2.14

polyethylene glycol octylphenyl ether (emulsifier OP) solution (2998).

2.2.15

acetic acid - ammonium acetate buffer solution (pH 6.3). A 485mL solution of ammonium acetate (4mol/L) solution and 15mL acetic acid (4mol/L) mixed (Preparation of a solution of ammonium acetate (4mol/L) should be adjusted to pH 7 in).

2.2.16 thymol blue (thymol blue) solution (1g/L)

Weigh 0.1g of thymol blue (thymol blue) was dissolved in 100mL ethanol […]