JB/T 9220.1-1999 JB/T 9220.1-1999 General principles and general provisions for chemical analysis of acidic slag from foundry cupola JB/T9220.1-1999 Standard download decompression password: www.bzxz.net

JB/T 9220.1—1999
This standard is a revision of JB/Z284.1—87 "General Principles and General Provisions for Chemical Analysis Methods of Acidic Slag of Casting Iron Furnace". When revising
, the original standard was edited and the main technical content remained unchanged. This standard replaces JB/Z284.1—87 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Foundry Standardization. The drafting units of this standard are: Shanghai Diesel Engine Factory, Nanchang Diesel Engine Factory, Guiyang Foundry, Shenyang Foundry), Gonghai Tuoqi Company, Huafeng Iron and Steel Factory, Xi Diesel Engine Factory, Changzhou Diesel Engine Factory, etc. The main drafters of this standard are: Wang Zhihan, etc. 423
1 Scope
Machinery Industry Standard of the People's Republic of China
Chemical analysis mcthods for acid slay of cupola--- General rules and specificationsJB/T9220.11999
Replaces JB/Z284.1-87
This standard specifies the criteria for a series of sample handling and analysis processes from the time the laboratory accepts the sample to the completion of the analysis: This standard is applicable to the composition analysis of acid slay of cupola. 2 General rules
2.1 This standard is applicable to the composition analysis of acid slay of cupola. 2.2 This method is an arbitration analysis method for acid slay of cupola. Under the premise of ensuring the accuracy of the analysis results, the use of other analysis methods is not excluded.
2.3 The allowable error specified in the analysis method is only a premise to ensure the accuracy of the judgment result and has no relationship with other departments. When analyzing two or more samples in parallel, the range of the analytical data obtained is valid if it does not exceed the allowable difference, and the average value is calculated. When calibrating with a standard sample, the deviation shall not exceed 2/2 of the allowable difference.4 The number of digits after the decimal point of the analytical result shall be aligned with the number of digits after the decimal point of the allowable difference in the analytical method. 3 General provisions
3.1 The atomic weight shall use the latest international atomic weight table.
The molecular weight shall be rounded to the second decimal place according to the digital rounding rules. 3.2 The digital rounding rules shall be implemented in accordance with the relevant digital rounding regulations. 3.3 The conversion factors in the calculation formula of the gravimetric method, the concentration of the standard solution or the titer of the volumetric method and other related numbers shall all be in four digits. 3.4 Processing of analytical samples wwW.bzxz.Net
3.4.1 Except for special requirements, analytical samples shall be taken as dry samples. 3.4.2 The analytical sample is roughly divided by the quartering method, passed through a 60-80 mesh sieve, and the mixed iron particles are removed by a strong magnet, and finally all passed through a 120 mesh sieve.
3.4.3 The sample is dried at 105-110 (1h), placed in a small-mouthed glass bottle, and stored in a desiccator. 3.5 Unless otherwise specified, the sensitivity of the analytical balance used should reach 0.1mg, and the code should be calibrated regularly. 3.6 Unless otherwise specified, all reagents used are analytical pure reagents. 3.7 Unless otherwise specified, the water used for reagent preparation and analysis is distilled water or deionized water. 3.8 Solutions except for the specified solutions Except for the above, all are aqueous solutions. 3.9 The concentration of non-standard solutions prepared with solid reagents is expressed in grams of reagent contained in 100ml solution. For example, 5g sodium cyanide solution means 100ml solution contains 5g sodium chloride. If the solid reagent contains water of crystallization, the fraction should be written in brackets after the reagent name. 3.10 The concentration of dilute solutions prepared with liquid reagents is generally expressed as the volume of concentrated solution plus the volume of water. For example: hydrochloric acid (1+2). Refers to 1 Approved by the State Machinery Industry Bureau on June 24, 1999 424
Implementation on January 1, 2000
JB/T 9220.1
A unit volume of hydrochloric acid (density 1.19 g/mL) is mixed with 2 unit volumes of water. 3.11 Temperature is expressed in degrees Celsius (C).
3.12 Hot water or hot solution refers to a temperature of 70~80°C, warm water or warm solution refers to a temperature of 10~50°C, and cold water or cold solution refers to room temperature.
3.13 When using a polytetrafluoroethylene beaker to dissolve the sample and emitting perchloric acid fumes, it should be heated on an asbestos net and the temperature should not exceed 250°C. 3.14 "Dry filtration" refers to filtering the solution into a dry container using dry filter paper and a drying funnel. The initial filtrate should be discarded in dry filtration. 3.15 "Incineration or drying to constant weight" generally refers to two consecutive incinerations or dryings, and after cooling to room temperature in a desiccator, the difference between the two weighings does not exceed 0.3 mg.
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