Method for removing arsenic from waste solution of etching PCB in order to produce feed additive of copper
A technology for feed additives and printed circuit boards, applied in chemical instruments and methods, improvement of process efficiency, water/sludge/sewage treatment, etc., to achieve the effects of small equipment investment, high arsenic removal rate, and low arsenic residue
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Embodiment 1
[0018] Embodiment 1: Removal of arsenic from the arsenic-containing PCB etching waste liquid of an enterprise producing basic copper carbonate.
[0019] The following table 1 is the composition list of PCB etching waste liquid:
[0020]
name
ρ(g / mL)
Cu 2+
(g / L)
Total As
(mg / L)
Pb 2 +
(mg / L)
Cl -1
(mg / L)
Cutting solution
1.222
144.2
20.0
<10
9.0
alkaline corrosion
Cutting solution
1.132
99.3
4.0
<10
-
[0021] Table 1
[0022] The alkaline PCB etching waste liquid in Table 1 is used to adjust the acidity of the acidic PCB etching waste liquid.
[0023] to 7m 3 5.5m into the reactor 3 Acidic PCB etching waste liquid, start the stirring paddle, the stirring speed is 300r / min, slowly add the concentr...
Embodiment 2
[0027] Embodiment 2: Removal of arsenic and product quality from arsenic-containing PCB etching waste liquid of an enterprise producing basic copper chloride.
[0028] Please refer to the following table 3 for the composition of the acidic PCB etching waste liquid:
[0029]
name
ρ(g / mL)
Cu 2+ (g / L)
Total As
(mg / L)
Pb 2+ (mg / L)
Cl -1 (mg / L)
Cutting solution
1.300
150.0
18.0
<10
10.1
[0030] table 3
[0031] Table 4 is a high-arsenic basic copper chloride quality analysis table, and the high-arsenic basic copper chloride in Table 4 is used to adjust the acidity of acidic PCB etching waste liquid to produce low-arsenic basic copper chloride.
[0032] copper hundred
Contains
quantity / %
not sour
dissolved matter
%
Al
As
Ca
CD...
Embodiment 3
[0038] Embodiment 3: Removal of arsenic and product quality from arsenic-containing PCB etching waste liquid of a copper sulfate production enterprise.
[0039] The low-arsenic basic copper chloride obtained in Example 2 was reacted with concentrated sulfuric acid to obtain a copper sulfate solution, and the solution was stirred and cooled, crystallized, and press-filtered to obtain copper sulfate pentahydrate. The product quality analysis results of copper sulfate pentahydrate are shown in Table 6:
[0040]
CuSO 4 ·5H 2 O%
Al
As
Ca
CD
co
Cr
Fe
Ni
Pb
Zn
mg / kg
98.5
<
2
0.4
<2
<
2
3.8
1.5
14.1
<
5
<
5
<
5
[0041] Table 6
[0042] Visible by table 6: the arsenic content of the copper sulfate pentahydrate t...
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