Practice of three-stage neutralization process by lime milk for treating acid waste water;

The effecting factors of boron precipitation from mother liquor of boric acid by lime milk;

Research on quality controlling technique in production process of active lime milk;

Experimental study on defluorination of milk of lime replaces alcium chloride;

The results show that the techniques of one step neutralization sedimentation and 2 step neutralization sedimentation are not suitable for treating this kind of wastewater, The most suitable technique is to neutralize the wastewater with excessive lime cream and to adjust the pH with acids.

The lime cream is one of main materials to produce the chemical product epoxypropane.

The two stage neutralization of limestone and lime has great advantage comparing with the traditional lime neutralization.

Using Al(Ⅲ) in pectin wastewater and lime white for precipitation,and using slag and activted carbon for decoloration,the wastewater from the process of extracting pectin by the salting out method is treated.

The way included guaranteed the A/S of the first refined fluid is bigger than 300;sodium silicon slag thorough separation;Guaranteed the time of the second desiliconation;appropriate quantity of lime white.