Study on home-made facility for production of potassium sulfate based on Mannheim process and its economic evaluation;

There are 3 problems in potassium sulfate production by Mannheim process:extra high analysis of organic carbon in raw material of KCl; in the byproduct HCl, no red colour appearance upon 1～2 drops of methyl orange in total acidity analysis; excess SO\-4\+ 2 analysis (≥0.

Based on the demands of township enterprises in the province and the local conditions,a two step method of potassium sulfate production was adopted instead of the traditional one step Mannheim furnace method.

Abundant, generally well preserved radiolarians were used in stratigraphic analysis of Pleistocene sequences of Tasman Sea.

For the canonical function in the unit disc D, f(z)=a 0+a 1z+…,f(z) ≠0,1,it is proved | a 1|≤2|a 0| |log| a 0||+A-M |log| a 0||+A-4πK11+|a 0|K|a 0|1+|a 0| ,where A is the Hayman′s constant and M is an absolute constant.