Now many manufacturers in the production of activated white clay by wet production process, namely wet acidizing process, its production process including bentonite bentonite hydration, adding sulfuric acid activation, washing, drying, crushing and other processes. The production process of products containing large amount of acid, the acid content can be repeatedly washed down to the standard requirements of HG/T2569-94.

Repeated washing process will produce containing bentonite bentonite acidification reaction of aluminum sulfate and unreacted sulfur containing wastewater, the wastewater if discharged directly, not only a waste of a lot of resources and will on the environment caused serious pollution.

In recent years, aiming at the utilization of activated clay production wastewater treatment and recovery of the some methods have been proposed, such as lime neutralization, neutralization by calcium carbide slag, acid activation method and the decomposition of clay in the manufacture of industrial water treatment agent of aluminum sulfate, dissolved iron manufacture copperas,, these methods, some better solves the governance of activated clay production wastewater.

At present, there are more commonly used methods in China.：

1. Lime neutralization method by adding lime to wastewater of acid has been neutralized, the sulfate radical ion, aluminum ions and iron ions forms of calcium sulfate, aluminum hydroxide and iron hydroxide precipitation removed, but these deposits, because they can not get use and become the new solid waste;

2. Decomposition method: using the remaining in the waste sulfuric acid to dissolve the clay, the clay in the aluminum leaching solution, again after purification in miscellaneous, evaporation and crystallization, separation and drying, crushing and packing of aluminum sulfate, so that effectively using the activated clay production wastewater and aluminum sulfate and other new resources;

3 recovery of poly silicon aluminum sulfate method: poly silicon aluminum sulfate is a new type of inorganic polymer flocculant, is in the silicate and aluminum salt flocculant based on the development of the composite product of poly silicate and aluminum salt.

Because of the flocculant flocculation effect is good, price cheap, treated water residual aluminum content low, so the research caused wastewater treatment at home and abroad in industry of great concern. At present, the main use of sodium silicate, sodium aluminate and aluminum sulfate and other industrial products as raw materials were prepared by the polymerization;

Recovering and preparing alum method: this method can not only produce ammonium alum and potassium alum recovery from the wastewater from the production of activated white clay, also can produce good market demand alum, which has solved the problem of environmental pollution caused by waste water, but also bring additional revenue to the enterprise, is kill two birds with one stone.

In the actual production process, manufacturers can according to their actual situation, choose their own wastewater treatment to solve the problem, so that you can increase the economic benefits of the enterprise, and also make a contribution to the cause of energy saving and environmental protection.