JB/T 9224-1999 JB/T 9224-1999 Standard sand for testing foundry binders JB/T9224-1999 Standard download decompression password: www.bzxz.net

JB/T9224--1999
This standard is a revision of ZBJ31006
-89 "Standard Sand for Testing Foundry Binders". The main technical content has not changed. During the revision, the original standard was edited. This standard replaces Z13J31006--89 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the National Foundry Standardization Technical Committee. The drafting unit of this standard: China Foundry Materials Company. 557
1 ScopeWww.bzxZ.net
Machinery Industry Standard of the People's Republic of China
Standard sand for checking foundry binder
Standard sand for checking foundry binderJB/T 9224-.1999
Replaces ZB J31 006:89
This standard specifies the brand, technical requirements, test methods and inspection rules, marking, packaging, transportation and storage of standard sand for checking foundry binder (referred to as standard sand for foundry). This standard is applicable to standard sand for checking the strength performance of foundry binder. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2684--1981 Test methods for raw sand and mixtures for foundry GB/T7143-1986 Chemical analysis methods for silica sand for foundry GB/T9442-1998 Silica sand for foundry
JB/T9156-1999 Test sieve for foundry
3 Definitions
This standard adopts the following definitions.
3.1 Standard sand for foundry
Standard sand for foundry is a specific specification of quartz sand suitable for testing the strength properties of foundry mold (core) binder 3.2 Acid consumption value
The number of milliliters of 0.1N hydrochloric acid solution consumed to neutralize the alkaline substance in 50g soil and 0.01g sand. 4 Brand
The brand of standard sand for casting is ZBS90-21-30, which means: ZBS--standard sand for casting (the first letter of the Chinese pinyin of casting, standard and sand) 90 Silicon dioxide classification code
21--Granularity grouping code
30--: Grain shape code
5 Technical requirements
5.1 Chemical composition
The silicon dioxide content of standard sand for casting shall not be less than 90%. 5.2 Particle composition
The particle composition of standard sand for casting shall comply with the provisions of Table 1: Approved by the State Bureau of Machinery Industry on June 24, 1999 558
2000-0101 implementation
Basic size of sieve hole
Residue
5.3 Mud content
3.35~~0.600
JB/T9224---1999
The mud content of standard sand for casting shall not exceed 0.3%. 5.4 Water content
The water content of standard sand for casting shall not exceed 0.3%. 5.5 Acid consumption value
The acid consumption value of standard sand for casting shall not exceed 5.0.5.6 Angular factor
10.075 Chassis
The particle morphology of standard sand for casting is expressed by the angular wind number, which shall not exceed 1.30.-Generally, it is not used as the basis for acceptance, and the code of the particle shape is indicated in the grade.
6 Test method
6.1 The determination of silicon dioxide content in standard sand for casting shall be carried out in accordance with GB/T7143. 6.2 The determination of particle composition, mud content and water content of standard sand for casting shall be carried out in accordance with GB/T2684, among which the test sieve adopts 113/T91566.3 The determination of the angular coefficient of standard sand for casting shall be carried out in accordance with Appendix B "Determination method of angular factor of silica sand for casting" in GB/T9442--~1998.
6.4 The determination of the acid consumption value of standard sand for casting shall be carried out according to the method specified in Appendix A (Appendix of the standard). 7 Inspection rules
7.1 Standard sand for casting shall be inspected according to the technical requirements specified in Chapter 5. 7.2 Standard sand for casting shall be in batches of 100 bags (if less than 100 bags are counted as one batch). For each batch of samples, 1 kg shall be taken from any three bags, and then the three samples shall be mixed evenly, and then the sample shall be selected for analysis by the "four-point method". 7.3 The purchaser may conduct necessary spot checks based on the quality certificate. If there is any discrepancy, the purchaser may conduct a re-inspection with the supplier. 7.4 If there is still a dispute after the re-inspection, the relevant department may be requested to arbitrate. 8 Marking, packaging, transportation, storage
8.1 The packaging, transportation and storage of standard sand for casting must be moisture-proof and leak-proof. The net weight of each bag is 25 kg. 8.2 The packaging of standard sand for casting must indicate the product name, brand, weight, full name of the production unit, and be accompanied by a quality certificate 559
A1 Test instruments and reagents
A1.1 Test instruments:
a) Magnetic stirrer;
h) 50ml acid and alkali burette;
c) 50ml, pipette;
d) 300ml. beaker;
c) 320mm surface III;
f) 250ml conical flask;
g) Medium speed filter paper.
A1.2 Reagents:
a) 0.IN hydrochloric acid standard solution;
b) 0.1N sodium hydroxide standard solution:
() 0.1% bromothymol blue indicator. A2 Test method
JB/T 9224--1999
Appendix A
(Appendix to the subject matter)
Determination of acid consumption of casting sand
Weigh 50g soil and 0.01g sand sample, place in a 300ml beaker, add 50mL distilled water (pH=7), then use a pipette to add 50ml 0.1N hydrochloric acid standard solution, cover the beaker with surface blood, stir on a magnetic stirrer for 5min, and then let it stand for 1h. Filter the solution into a 250ml conical flask with medium-speed filter paper, and wash the sand sample 5 times with distilled water, 10ml each time. Add 31 drops of bromothymol blue indicator to the filtrate, titrate with 0.1N sodium hydroxide standard solution, and shake until the blue color remains for 30s as the end point. A3 Calculation of acid consumption value
The test results are calculated according to formula (A1):
Acid consumption value = (50Nl--VN)X10
Where: N*
The calibration value of the equivalent concentration of the hydrochloric acid standard solution added, N; W drops of sodium hydroxide standard solution in milliliters, ml; N drops of sodium hydroxide standard solution in the calibration value of the equivalent concentration, N. 560
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