T/ZJGFTR 001-2021 Active Group standards

T/ZJGFTR 001-2021 Reprocessed copper nitrate trihydrate product standards

Publish Date: 2021-08-25 Implement Date: 2021-09-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/ZJGFTR 001-2021

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: \nPollutant emission standards

ICS Name: Recycling

Publish Date: 2021-08-25

Implement Date: 2021-09-01

Scope

Scope: This standard specifies the raw material requirements, production processes and control requirements, product quality indicators, sampling and inspection methods, inspection rules and marking, packaging, transportation, and storage requirements for copper nitrate recovered from etching wastewater of printed circuit boards (PCBs). This standard applies to copper nitrate products produced by reprocessing etching wastewater of PCBs, and is limited to industrial use only. Main technical content: The etching wastewater, mainly copper nitrate, is transported to a steel-lined plastic enamel reactor by a centrifugal pump, where stirring is initiated and wet copper oxide is slowly added to neutralize the free nitric acid in the solution. After the pH value of the solution decreases to 2.0~3.0, the addition of materials is stopped (this process takes 1.5 hours). Then, the material solution is transported to a filter press by a centrifugal pump for filtration and impurity removal. The permeate is collected in an enamel reactor for evaporation, concentration, cooling, and crystallization. After being filtered by a centrifuge, copper nitrate is obtained. The mother liquor is collected in a mother liquor tank and transported to an intermediate tank for the next batch of use. The evaporation condensate water is neutralized with calcium oxide after three-stage absorption to obtain a calcium nitrate solution. This solution is treated with a nanofiltration membrane, where the concentrated water is evaporated, concentrated, cooled, and crystallized to recover calcium nitrate, and the diluted water is treated to meet discharge standards after being cleaned.