Method for preparing high-value spinel material by resourcefully treating electroplating sludge
A technology for electroplating sludge and spinel, which is applied in chemical instruments and methods, preparation of alkaline earth metal aluminate/alumina/aluminum hydroxide, chemical/physical processes, etc. Solve the problems such as the type of mud and heavy metals, and achieve the effect of increasing the yield, avoiding secondary pollution, and high purity
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[0042]Example 1
[0043](1) Take a certain electroplating sludge, dry it and crush it, and measure its main element content as shown in Table 1:
[0044]Table 1 Types and contents of electroplating sludge elements
[0045] element Ni AlCa SFe Si content 27.1%13.9%6.0%4.4%3.7%1.9%
[0046]It can be seen from Table 1 that the sludge is mainly composed of nickel and aluminum. After the nickel is extracted by pre-pickling, MgO is added to prepare magnesium aluminum spinel. The specific method is:
[0047]Take 20g of the dried and crushed sludge, add 100mL of dilute hydrochloric acid to extract nickel, stir for 30min, the pH of the extract is ≈4; then filter to obtain a nickel-containing solution and filter cake; after drying the filter cake, crush;
[0048](2) Pre-roast the dried sludge crushed in step (1) at 400°C for 0.5 hours;
[0049](3) The pre-baked material is crushed, the total mass is 12.8g, and the measured Ni content is 5.4%, and the Al content is 16.7%; according to the Al:Mg molar ratio 2:1...
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[0052]Example 2
[0053](1) Take a certain electroplating sludge, dry it and crush it, and measure its main element content as shown in Table 2:
[0054]Table 2 Types and contents of electroplating sludge elements
[0055] element Fe Zn Ca SAlCu content 16.5%13.6%7.8%3.4%1.4%1.3%
[0056]The sample is mainly iron and zinc elements, which can be added by Fe2O3Or ZnO to prepare magnetic zinc iron spinel catalytic material;
[0057](2) Take 10g of the dried sludge crushed in step (1) and pre-roast at 500°C for 1 hour;
[0058](3) The pre-baked material is crushed, the total mass is 8.9g, the iron content is 18.5%, the zinc content is 15.3%; according to the molar ratio of Fe:Zn 2:1 (ZnFe2O4Spinel) add 1.0g Fe2O3Mix evenly to obtain sludge treatment material;
[0059](4) Grind the sludge treatment material prepared in step (3), and press it into tablets under 10MPa for 2 minutes;
[0060](5) Place the compressed and molded sample prepared in step (4) at 800°C for 3 hours, then crush, grind, wash with 100 m...
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[0068]Example 3
[0069](1) Take a certain electroplating sludge, dry it and crush it, and measure its main element content as shown in Table 3:
[0070]Table 3 Types and contents of electroplating sludge elements
[0071] element CrAlCu Ca SFe content 14.9%7.2%5.9%6.3%4.3%3.0%
[0072]The sample is mainly composed of chromium and aluminum. Magnesium-aluminum-chromium spinel refractories can be prepared by adding MgO; among them, the pH of the sludge leachate is ≈9, and chromium is easily oxidized at high temperature under alkaline conditions, so pre-acid is required Wash, the specific method is:
[0073]Take 30g of the dried and broken sludge, add 60mL of dilute hydrochloric acid, stir for 10min, the pH of the solution after equilibrium is ≈6; then filter to obtain the dilute acid solution and the sludge filter cake; after drying the filter cake, break it;
[0074](2) Pre-roast the crushed dried sludge in step (1) at 350°C for 20 minutes;
[0075](3) The pre-baked materials are crushed, the total m...
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