The production process of Magnesium Sulfate Heptahydrate is mainly through the reaction of Magnesium Oxide and sulfuric acid, and then through pressure filtration, cooling and crystallization after drying. Magnesium Sulfate Grade Mgo,Magnesium Oxide Powder,Mgo Magnesium Sulphate,Magnesium Sulfate Grade Magnesium Oxide FENGCHENG JINDE MAGNESIUM CO., LTD , https://www.brucitemagnesium.com
When preparing magnesium sulfate heptahydrate, the purity of magnesium sulfate heptahydrate can be more than 97% at one time, with energy consumption and quality indexes.
Tin ingots are divided into three grades according to their chemical composition: Sn99.90, Sn99.95, and Sn99.99.
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The chemical composition of the tin ingot should meet the requirements of the following table.
Brand
Sn is not less than
chemical composition %
Impurity content is not greater than
As
Fe
Cu
Pb
Bi
Sb
Cd
Zn
Al
sum
Sn99.90
99.90
0.008
0.007
0.008
0.040
0.015
0.020
0.0008
0.001
0.001
0.10
Sn99.95
99.95
0.003
0.004
0.004
0.010
0.006
0.014
0.0005
0.0008
0.0008
0.050
Sn99.99
99.99
0.0005
0.0025
0.0005
0.0035
0.0025
0.002
0.0003
0.0005
0.0005
0.010