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Regulated quality parameters

SODA ASH, TECHNICAL QUALITY
GOST 5100-85
Developed by NIOCHIM
TECHNICAL REQUIREMENTS
Normalized quality parameters 

Description Norm for type and grade
Type A  (dense soda ash) Type B (light soda ash)
Prime grade Grade 1 Grade 2 Prime grade Grade 1 Grade 2
1. Appearance White granules White powder
2. Sodium carbonate (Na2CO3), min.  % 99,4 99,0 98,5 99,4 99,0 99,0
3. Sodium carbonate (Na2CO3) as uncalcined product, min. %  98,7 98,2 97,0 98,9 98,2 97,5
4. Ignition loss (at 270–300) ºС, max. % 0,7 0,8 1,5 0,5 0,8 1,5
5. Chlorides as NaCl max. % 0,2 0,5 0,8 0,4 0,5 0,8
6. Iron as Fе2О3, max. % 0,003 0,005 0,008 0,003 0,003 0,008
7. Water insolubles, max. % 0.04 0.04 0.08 0.03 0.04 0.08
8. Sulfate as Na2SO4, max. % 0.04 0.05 n/a 0.04 0.05 n/a
9. Apparent density, min. g/cm3 1.1 0.9 0.9 n/a
10. Sieve analysis:       То же
above 2 mm, max. % n/a 5 5  
under 1,25 mm, max. %  100 n/a  
above 1 mm, max. %  3 n/a  
under 0,1 mm, max. %  7 15 25  
11. Magnetic impurities above 0,25 mm none n/a n/a

Remarks:
1. Values in items 2, 5-8 are specified for calcined matter.
2. For electron-tube glass technical soda ash type A, prime grade is applied.
3. In technical soda ash predestined for sodium nitrite used for caprolactam manufacture as well as for sulfide salts, bleachers and degreasing of parts in electronic industry oil content must be less than 0,01%.
4. Sodium carbonate content in uncalcined product and ignition loss for technical soda ash type A, prime grade predestined for detergents, grades 1 and 2, and type B shall be specified for the moment of shipping.  
5. In soda ash type A, prime grade predestined for detergents the content of particles above 1 mm shall not be specified.
6. With customer’s consent soda ash grade B may be produced with such values: sodium carbonate (Nа2СОз) content min. 97 %; sodium carbonate content in uncalcined product min. 94%; ignition loss at 270-300 °С max. 3 %; chloride content as NaCl max. 1,5 %; iron content as Fе2О3 max. 0,03 %.

Сайт обновлен 13/11/2017, 11:07