HG/T 2956.5-2001 Determination of ferrous oxide content in boron and magnesium ores Potassium dichromate volumetric method HG/T2956.5-2001 Standard download decompression password: www.bzxz.net

1cs 73.080
Chinese Chemical Industry Standard
HG/T 2956.2~2956.82001
Analytical methods for ascharite ores2002-01-24Promulgated
2002.0701Implementation
Promulgated by the State Economic and Trade Commission
Requisition No.: 10102—2002
DC/T 2956. 5—2001
This standard is revised from the National Chemical Industry Standard 1/T 256.5—193 Analysis of the content of iron oxide in magnesium ore.
From the date of implementation, this standard will replace HG/T2055.3-1082. This standard was proposed by the former National White Oil and Chemical Industry Policy and Regulations Department. The standard was approved by the Chemical Industry Technical Committee. The responsible drafting unit of this standard is Lianyungang Design and Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Wang Heping and Zhang Xiaojiang. This standard was issued as the Ministry of Chemical Industry Standard HG1-35266 in 1916; it was issued as the Ministry of Chemical Industry Standard HG1-35266 in 1932; it was adjusted to the recommended chemical industry standard in 1997, and the national standard GB3.47.5-82 was abolished. The new number is HG/T2956.51S82. 15
Chemical Industry Standard of the People's Republic of China
Determination of ferrous chloride content in magnesia ore-Potassium dichromate volumetric method
Assbnuritk urs
Lelerminatiun or Ferrus xide eantcntPotnssiuu dlelirodinle ulurnetric methxl1 Scope
This standard specifies the volumetric method for the determination of ferrous chloride content in magnesia ore. This standard is applicable to the determination of iodine content in magnesium carbonate products. 2 Referenced standards HC/T 2956.5—2001 [G 2956.5—1932] The following standards contain clauses that are referenced in this standard and become clauses of this standard. When this standard is published, the versions shown are valid. All standard parts will be revised. The latest versions of the following standards can be used as references. --1988 Chemical reagent titration analysis > Standard liquid analysis > GB/6682—1992 Specification and test method for cold water analysis (eg1303692:1997) 3 Method summary The test is carried out in a safe temperature range. The test is decomposed with acid in the presence of a small amount of acid, and the solution is titrated with sodium diphenyl ether as the indicator using a heavy potassium standard.
4 Reagents and separation
The specification of water used in this test should be the same as that in K/82. All reagents mentioned refer to pure reagents unless otherwise specified. 4.1 Sodium ammonium sulfate,
4.2 Hydrochloric acid group solution: 1-1
4.3 Sulfur mixed solution.
15% acid slowly add 00m= medium cold into b3ml phosphorus carrier, mix 4.4% chromium carrier potassium standard clear solution: /5K,Cr;U,) 0.(2(ol/L. Weigh 9.3806 pre-12GT down to constant temperature of the British visual more (G129-9) into a 25m cup, add water to dissolve, transfer to 1M))ml running plate, use water to change the sample rate, according to 4.5% sodium diamine two acid index wave.5g/L: Weigh 1.3% benzene sulfonate sodium, dissolve 1% water, add 1.-? drops of sulfuric acid, and store evenly in a brown bottle. 5 Instruments and equipment
Fishing ferrous decomposition place · such as material.
National Economic and Trade Commission 2002-01-24 Approved 2002-07-01 implementation plan
1 core/T2956.52001
1 dimension system; 250l.); 2 safety plan
Figure 1 Measurement of the rate of filling
The safety plan is a rubber tube. A 6I1 separation tube is used. A long 40mm latex tube is put on the upper end of the separation tube. The middle of the latex tube is small and the upper lung is layered with glass
6 test sample
The sample passes through a 125 test sieve (GH/008.1), is maintained at 1G5~110℃ and is above 21, and is placed in + air to cool to room temperature. 7 Analysis steps bzxz.net
7.1 Weigh 0.3~1g of sample (accurate to 0.0200g), add 1g of sodium aldehyde and 30~40m3 of acid solution, immediately put it in a safe place, heat it on an electric hot plate, and boil it slightly for 30min before removing it. Quickly cool it with cold water (Note: if the negative pressure in the bottle is too high, the bottle will crack), rinse the safe place bottle with water and dilute it to 100L, 7.2 Add 15~250L of phosphorus mixed aldehyde solution, 9.5g of sodium bicarbonate and 1~6 drops of sodium disulfonate as an indicator, and immediately use dichromic acid to mark the solution until the wave shows a bright color as the end point. 8 Expression of analysis results
Express it in mass percentage (reverse domain FeO) (X> Direct formula (1) calculation: X--VX0.071Hx100
In the formula: c
is the actual value of the standard titration solution, mol/mol, V---the mass of a standard titration solution of heavy chromium, ml. Sample,
is the mass of iron oxide in grams equivalent to 1.1 ml. potassium dichromate standard titration solution [e(1/6KCr0=1.1Hmol/1.1,
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