Recovery system for treating copper nitrate waste liquid

Abstract

A recycling system for treating copper nitrate waste liquid includes a crystallization reaction device. The crystallization reaction device includes a first storage container, a second storage container, and a reaction tank. The first storage container is used to store copper nitrate waste liquid, and the second storage container is used to store an oxalic acid solution. The first storage container and the second storage container are each connected to a reaction space defined by the reaction tank through a pipeline. Each pipeline is equipped with a pump to transport the solutions stored in the first storage container and the second storage container to the reaction tank for crystallization reaction, thereby forming a reaction slurry.

Claims

1. A recycling system for treating copper nitrate waste liquid, comprising: a crystallization reaction apparatus, including a first storage container, a second storage container, and a reaction tank, wherein the first storage container is used to store copper nitrate waste liquid, the second storage container is used to store an oxalic acid solution, the first storage container and the second storage container are each connected to a reaction space defined by the reaction tank via a pipeline, each pipeline is equipped with a pump to transport the solutions stored in the first storage container and the second storage container to the reaction tank for crystallization reaction, thereby forming a reaction slurry; the crystallization reaction apparatus is used to perform a crystallization step, wherein the copper nitrate waste liquid and the oxalic acid solution are injected into the reaction tank at similar feed flow rates for crystallization reaction, wherein... The temperature (T) of the reaction tank is 25~40℃, the stirring rate (N) of the reaction tank is 600~900rpm, the feed rate (Q) of the copper nitrate waste liquid and the oxalic acid solution is 30~60ml / min, and the concentration (C) of the oxalic acid solution is 1.3~1.6M.

2. The recovery system for treating copper nitrate waste liquid as described in claim 1 further includes a nitric acid recovery device for performing a nitric acid recovery step. The nitric acid recovery device includes a vacuum filtration device and a rotary evaporator. A filter cup of the vacuum filtration device is used to hold the reaction slurry after the reaction is completed. The reaction slurry is vacuum filtered to obtain a filtrate and a precipitate. The rotary evaporator performs rotary evaporation on the filtrate to obtain condensate and a concentrated filtrate, such that the nitric acid concentration in the concentrated filtrate is higher than the nitric acid concentration before concentration. The nitric acid recovery step is carried out at a temperature of 30-87.5 kPa, and the filtrate is maintained at a temperature of about 60-82°C.

3. The recovery system for treating copper nitrate waste liquid as described in claim 1, wherein, The residence time (τ) in this crystallization step ranges from 8.33 to 16.7 min.

4. The recovery system for treating copper nitrate waste liquid as described in claim 1, wherein, During this crystallization step, the precipitation rate (Rp) is approximately 8.13 g / L min.

5. The recovery system for treating copper nitrate waste liquid as described in claim 1, wherein, In this crystallization step, the aggregation rate (β) during crystallization is approximately 1.04 x 10⁻¹⁷ m³ / no.s.

6. The recovery system for treating copper nitrate waste liquid as described in claim 1, wherein, In this crystallization step, the nucleation rate (Bo) during crystallization is approximately 2.5 x 10¹³ no. / m³.s.

7. The recovery system for treating copper nitrate waste liquid as described in claim 1, wherein, In this crystallization step, the particle size (Dp) during crystallization is 2475.7 nm.

8. The recovery system for treating copper nitrate waste liquid as described in claim 1, wherein, During this crystallization step, the system power (P) is approximately 9.24 W nm.

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