Metal processing waste liquid zero-discharge equipment and recycling treatment method

Abstract

The invention discloses metal processing waste liquid zero-discharge equipment and a recycling treatment method. The metal processing waste liquid zero-discharge equipment is applied to a waste liquidtreatment module and comprises a separation settling tank communicated with a waste collecting pipe, a stirring barrel arranged on the bottom side of the exterior of the separation settling tank, a filter pressing device connected to a discharging opening of a stirring barrel, and an oil removing mechanism arranged in the separation settling tank. An electrolytic separation mechanism is arrangedabove the settling tank, the separation settling tank is divided into four circular treatment units, and the four circular treatment units comprise a first-stage separation settling tank, a second-stage separation settling tank, a third-stage separation settling tank and a fourth-stage separation settling tank, and the separation settling tank is fixed through a support frame. According to the invention, the wastewater is subjected to multiple times of cyclic electrolysis and precipitation through the separation settling tank, heavy metal ions which are difficult to decompose are efficiently and comprehensively electrolyzed and precipitated, and multiple heavy metal ions which are difficult to recover are subjected to efficient modification innocent treatment.

Description

technical field [0001] The invention belongs to the field of parts manufacturing, in particular to a metal processing waste liquid zero-discharge device and a recovery treatment method. Background technique [0002] In the treatment of heavy metal wastewater, the chemical precipitation method is mainly used to treat the metal waste liquid at present, but because the heavy metal wastewater also carries a large amount of workshop dust, lubricating grease and other impurities during the processing and production process, a large amount of dust and grease molecules are in the Often the liquid agglomerates and wraps metal ions, so the chemical precipitation method cannot efficiently remove heavy metal ions and metal powders in water. In addition, the precipitated precipitates mainly include hydroxide precipitates, sulfide precipitates and ferrite precipitates. In the metal waste liquid, many metals usually coexist. When the pH value is adjusted after precipitation, some heavy met...

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Problems solved by technology

[0002] In the treatment of heavy metal wastewater, the chemical precipitation method is mainly used to treat the metal waste liquid at present, but because the heavy metal wastewater also carries a large amount of workshop dust, lubricating grease and other impurities during the processing and production process, a large amount of dust and grease molecules are in the Often the liquid agglomerates and encloses metal ions, so the chemical precipitation method cannot efficiently remove heavy metal ions and metal powders in water. In addition, the precipitated precipitates mainly include hydroxide precipitates, sulfide precipitates, and ferrite precipitates

In the metal waste liquid, many metals usually coexist. When the pH value is adjusted after precipitation, some heavy metals are easy to dissolve again when the pH value is too high, resulting in the failure of the precipitation treatment.

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