Among them,the major transformations what against the sulfur flotation include: concentrating of zinc tailings,adding acid,non-featured operations,using 11# oil as frother,the remodelling of flotator,etc.

Use maize without germ as raw material and acid as a disposal reagent, the effect of reducing sugar content on acid reagent, moisture of material, acid density, extrusion temperature and speed of screw were studied .

These reviewed methods are addition of scale inhibitors, addition of acid and water softening.

The function of automatic acid adding, sewage draining, water supplying and continuous medicament adding could be realized by analysing the output signal sourcing from pH value and electricity conducting ratio, which are monitored through online recycle cooling water monitoring system mounted on the water cycling system.

Improvement of acid addition in juice-milk beverage processing;

If the acid addition was used to treat the make-up water with a total alkaline greater than 500 mg/L, the concentration could be greater than 3.