Synchronous fluorine-calcium removal treatment process for reverse osmosis concentrated liquor of waste water from lead-zinc smelting

Abstract

The invention relates to a synchronous fluorine-calcium removal treatment process for the reverse osmosis concentrated liquor of waste water from lead-zinc smelting. The process comprises the following steps: firstly, removing fluorine by virtue of oxidation and precipitation, secondly, removing calcium by precipitating, thirdly, removing fluorine by virtue of adsorption, next, sequentially regenerating activated aluminum oxide, removing fluorine from the generated mixed liquor, removing calcium from the generated mixed liquor and treating the generated mixed liquor, and finally, removing fluorine by precipitating, wherein the precipitation sludge generated in the calcium removal process is gathered and dehydrated by virtue of filter pressing, the water obtained by filter pressing is returned to a reverse osmosis concentrated liquor collecting tank for circular treatment, and the mud cake is subjected to unified disposal. After the oxidization, precipitation and adsorption treatment processes are adopted, the fluorine content and the calcium content of the reverse osmosis concentrated liquor are lower than 3mg/L and 50mg/L, respectively, and the problems of scaling and blockage caused by fluorine ions and calcium ions in the subsequent evaporation and concentration process of the reverse osmosis concentrated liquor are solved.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a process for synchronously removing fluoride and calcium from lead-zinc smelting wastewater by reverse osmosis concentrated liquid. Background technique [0002] In recent years, my country has entered a period of high incidence of heavy metal pollution incidents, and incidents of children's blood lead exceeding the standard have occurred in many places, especially accidental discharges from mines and smelting enterprises, which have caused serious ecological environmental pollution. Lead and zinc smelting is a highly polluting industry in the non-ferrous metal industry, and the discharge of wastewater containing heavy metal pollutants poses a serious threat to the safety of the ecological environment. The water quality of lead-zinc smelting wastewater is complex, and its main pollutants include heavy metal ions lead, zinc, cadmium, chromium, cobalt, nickel...

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Problems solved by technology

On the other hand, the sulfate ion content in the reverse osmosis concentrate is extremely high, and the current evaporation and concentration process has not yet solved the calcium ion scaling problem well, and CaSO is easily formed during the evaporation process. 4 Precipitation leads to fouling and blockage, so the simultaneous removal of calcium ions during the defluoridation process is also extremely important

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