A process for simultaneous removal of fluoride and calcium from lead-zinc smelting wastewater by reverse osmosis concentrate

A reverse osmosis dope and calcium treatment technology, applied in metallurgical wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve problems such as scaling and clogging

Active Publication Date: 2016-04-27
SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY +1
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  • Abstract
  • Description
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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

Method used

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  • A process for simultaneous removal of fluoride and calcium from lead-zinc smelting wastewater by reverse osmosis concentrate
  • A process for simultaneous removal of fluoride and calcium from lead-zinc smelting wastewater by reverse osmosis concentrate
  • A process for simultaneous removal of fluoride and calcium from lead-zinc smelting wastewater by reverse osmosis concentrate

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Embodiment

[0030] Embodiment: a smelter The reverse osmosis dope produced during the zero-discharge treatment of lead-zinc smelting wastewater is the treatment object, and it is continuously treated according to the technological process of the present invention, and the treatment scale is 5m 3 / h, see figure 2 , its working steps are as follows:

[0031] Step 1: From the reverse osmosis concentrated liquid storage tank 1 at a distance of 5m 3 The reverse osmosis concentrated liquid is continuously pumped into the oxidation tank 2 at a flow rate of 10L / h, and 10% H is continuously added at a flow rate of 10L / h 2 o 2 To the oxidation tank 2, the effluent of the oxidation tank 2 flows into the fluoride-removing precipitation tank 3 by gravity, and the fluoride-removing precipitation tank is a center tube vertical flow type precipitation tank, and the pH value is adjusted to 8.5-9.0 with a NaOH solution with a mass concentration of 10%, respectively according to Add PFS and PAM at the...

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Abstract

The invention relates to a process for synchronous defluoridation and decalcification of lead-zinc smelting wastewater by reverse osmosis concentrated liquid. The process steps are firstly oxidative precipitation to defluoride, then precipitation to decalcify, then adsorption to defluoride, and then active oxidation Aluminum regeneration, defluorination of the regeneration mixture, decalcification of the regeneration mixture, treatment of the regeneration mixture, and finally precipitation and defluorination. The precipitated sludge generated during the decalcification process is collected and dehydrated by pressure filtration. The water is returned to the reverse osmosis concentrate collection tank for recycling treatment, and the mud cake is treated uniformly. By adopting oxidation, precipitation, and adsorption treatment processes, the fluorine and calcium contents of the reverse osmosis concentrate are lower than 3mg / L and 50mg / L respectively, which solves the problem of fouling caused by fluoride and calcium ions in the subsequent evaporation and concentration process of the reverse osmosis concentrate. clogging problem.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/04C02F1/281C02F1/5236C02F1/66C02F1/72C02F9/00C02F2101/10C02F2101/14C02F2103/16C02F2301/08
Inventor 郑金华曾令成晏波王远文李军群徐立成祝云章刁小东吴斌秀肖元法罗琨陈涛肖贤明
Owner SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY
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