Sulfuric acid GOST 667 73. Battery sulfuric acid. Determination of the mass fraction of calcination residue

INTERSTATE STANDARD

SULFURIC ACID BATTERY

TECHNICAL CONDITIONS

Official publication

Standardinform

INTERSTATE STANDARD

BATTERY SULFURIC ACID Technical specifications

Battery sulfuric acid. Specifications

MKS 71.060.30 OKP 21 2111

Date of introduction 01/01/75

This standard applies to concentrated battery sulfuric acid intended, after diluting it with distilled water, as an electrolyte for filling lead-acid batteries.

Formula H 2 S0 4.

Molecular mass (according to international atomic masses 1971) - 98.08.

1. TECHNICAL REQUIREMENTS

1.1. Battery sulfuric acid must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the prescribed manner.

1.2. In terms of physical and chemical parameters, battery sulfuric acid must comply with the standards specified in the table.


Indicator name	Top grade
	OKP 21 2111 0720 00	OKP 21 2111 0730 09
1. Mass fraction of monohydrate (H 2 S0 4), %
2. Mass fraction of iron (Fe), %, no more
3. Mass fraction of residue after calcination, %, no more
4. Mass fraction of nitrogen oxides (N 2 0 3), %, no more
5. Mass fraction of arsenic (As), %, no more
6. Mass fraction of chloride compounds (C1), %, no more
7. Mass fraction of manganese (Ml), %, no more
8. Mass fraction of the amount heavy metals in terms of
lead (Pb), %, no more
9. Mass fraction of copper (Cu), %, no more
10. Mass fraction of substances that reduce KMn0 4,
cm 3 solution with (1/5 KMP0 4) = 0.01 mol/dm 3, no more
11. Transparency	Must pass the test according to clause 3.13

Note: By agreement with the consumer, for enterprises working on pyrites and producing a 1st grade product, the mass fraction of arsenic is allowed to be no more than 0.0001%.

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2. ACCEPTANCE RULES

2.1. Battery sulfuric acid must be supplied in batches. A batch is considered to be a quantity of a product that is homogeneous in its quality indicators, sent to one address and accompanied by one quality document. When shipping a product in tanks or containers, each tank or container is considered a batch. Lot weight for retail- no more than 10 tons.

2.1.1. The product quality document must contain:

name of the manufacturer or its trademark;

product name, grade;

batch number;

net weight;

date of shipment;

technical control stamp;

analysis results or confirmation of product compliance with the requirements of this standard;

confirmation of the affixing of a danger label to the packaging in accordance with GOST 19433.

2.1.2. At manufacturing enterprises working on natural and gas sulfur in accordance with GOST 127.1 - GOST 127.3, the mass fraction of arsenic, chloride compounds and copper is not determined.

The manufacturer determines the mass fraction of the amount of heavy metals in terms of lead at least once a month.

2.2. To control the quality of battery sulfuric acid, samples are taken from each tank, container, reservoir or 5% of bottles, but not less than three for small batches (less than 60 bottles).

It is allowed to apply the results of the analysis of the quality of sulfuric acid, located in a pre-tested container at the manufacturer’s warehouse, to all batches formed from it.

2.1.1-2.2.

2.3. If unsatisfactory analysis results are obtained for at least one of the indicators, a repeat analysis is carried out from a double number of samples or product units taken from the same batch. The results of the re-analysis are final and apply to the entire batch.

3. METHODS OF ANALYSIS

3.1. Sample selection

Point samples from each tank, container, reservoir are taken with a sampler made of stainless steel 10Х17Н13М2Т (Fig. 1) or other acid-resistant material that does not deteriorate the quality of the sampled sulfuric acid, attached to a chain or cable made of acid-resistant steel, slowly immersing it to the bottom.

Point samples from bottles are taken with a glass tube (with a rubber bulb) reaching to the bottom of the bottle.

The volume of a spot sample is at least 0.5 dm 3 ; from bottles - not less than 0.1 dm 3.

Selected spot samples are poured into a closed container made of stainless steel or other acid-resistant material that does not degrade the quality of sulfuric acid. The resulting sample is thoroughly mixed with a glass rod and an average sample with a volume of at least 0.5 dm 3 is taken into a dry bottle with a capacity of 0.5-1.0 dm 3 with a ground glass stopper.

A label is placed on the bottle with the following designation:

product names;

batch numbers;

date of sampling.

They can be applied directly to the bottle.

3.2. General requirements

When carrying out analyzes the following is used:

reagents of at least h grade. Yes.";

distilled water according to GOST 6709, neutralized with methyl red;

distilled water, not containing carbon dioxide, is prepared according to GOST 4517;

laboratory glassware and equipment according to GOST 25336;

cylinders, beakers, measuring flasks (2nd accuracy class) according to GOST 1770;

burettes according to GOST 29251, pipettes according to GOST 29227;

It is allowed to use glass capacity measures of a similar type;

laboratory scales general purpose according to GOST 24104* 2nd accuracy class with the highest weighing limit of 200 g and 4th accuracy class with the highest weighing limit of 500 g;

set of weights according to GOST 7328; photocolorimeter type FEK-56 M, KFK-2 or another type, providing the specified sensitivity and accuracy;

thermometer type P-4 t = (0-100) °C or other similar thermometer;

filter paper according to GOST 12026 or similar;

universal indicator paper for determining the pH of a solution.

3.3. Determination of the mass fraction of monogcd-

The method is based on titration of a sulfuric acid sample with a solution of sodium hydroxide in the presence of a methyl red indicator.

3.2, 3.3. (Changed edition, Amendment No. 3).

3.3.1. Reagents, solutions, glassware, equipment

succinic acid according to GOST 6341; oxalic acid according to GOST 22180; phenolphthalein, solution with a mass fraction of 1%, prepared according to GOST 4919.1;

methyl red, alcohol solution with a mass fraction of 1%, prepared according to GOST 4919.1;

chemical lime absorber KhP-I according to GOST 6755, ascarite or other absorber that provides protection against carbon dioxide.

Sodium hydroxide according to GOST 4328, a solution with a concentration of (NaOH) = 0.5 mol/dm 3 (0.5 N), is prepared as follows: according to GOST 25794.1, prepare a solution with a mass fraction of sodium hydroxide of 50%. The clear solution is drained with a siphon and its concentration is determined using a hydrometer.

Then calculate the required amount of the resulting solution to prepare 1 dm 3 0.5 mol/dm 3 solution. A concentrated solution of sodium hydroxide in the amount determined by calculation is slowly poured along the walls, in order to avoid strong splashing, into a heat-resistant glass flask into water boiled for 15 minutes. The flask is closed with a stopper equipped with