Method for preparing iron-carbon micro-electrolysis filler by using acid washing iron mud
An iron-carbon micro-electrolysis and iron-sludge technology is applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc. The effect of high utilization rate and improved product competitiveness
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Embodiment 1
[0036] The content of iron ions in pickling waste hydrochloric acid of a precision steel wire factory is 65g / L, and the content of iron ions in the washing water is 4.5g / L. After neutralization with liquid caustic soda, the solid-liquid separation is carried out through a diaphragm filter press, and the water content is obtained. Iron slime with 61wt% iron oxide content of 38wt% and sodium chloride content of 1wt%.
[0037] Mix 9 kg of the above-mentioned iron mud with 1 kg of carbon powder with an average particle size of 30 μm, and add 120 g of clay as a binder, and after homogenization, use a test pellet machine to press into flat pellets with a diameter of 15 mm and a thickness of 10 mm; The pellets are sent to a drying oven for dehydration at 160°C for 60 minutes, and the moisture content is reduced to less than 5wt%. The dried pellets are put into an argon atmosphere furnace, calcined at 950°C for 90 minutes, and cooled with the furnace to obtain iron-carbon micro-electro...
Embodiment 2
[0039] The content of iron ions in the pickling waste hydrochloric acid of a steel pipe factory is 215g / L, and the content of iron ions in the flushing water is 9.7g / L. After neutralization with liquid caustic soda, the solid-liquid separation is carried out through a diaphragm filter press to obtain a water content of 55.4 wt%, iron oxide content of 43wt%, sodium chloride content of 1.6wt% iron slime.
[0040] Mix 8.5kg of the above-mentioned iron mud with 1.5kg of carbon powder with an average particle size of 50μm, and add 150g of sodium bentonite as a binder. After homogenization, press it into a flat ball with a diameter of 15mm and a thickness of 10mm with a test pelletizer pellets; the pellets were sent to a drying oven for dehydration at 180°C for 60 minutes, and the moisture content was reduced to less than 5wt%; the dried pellets were put into an argon atmosphere furnace, calcined at 900°C for 120 minutes, and cooled with the furnace to obtain iron-carbon microspheres...
Embodiment 3
[0042] The iron-carbon filler I and iron-carbon filler II prepared in Examples 1 and 2 were used to treat the flushing wastewater of a copper plating line in an electroplating factory.
[0043] The pH value of copper-plated wire flushing wastewater is 8.4, and the total copper content is 27.8mg / L. Use dilute hydrochloric acid to adjust the pH value to 3 and set it aside. Put 1kg each of iron-carbon filler I and iron-carbon filler II in the same membrane shell with an aeration device at the bottom to form a fixed bed structure, and use a peristaltic pump to make the copper-containing flushing wastewater with adjusted pH value 10L / The hourly flow rate passes through the fixed bed of iron-carbon packing, and at the same time, the air is exposed to the device, and the effluent is sampled to detect the total copper content. The test results show that after the fixed bed treatment composed of iron-carbon filler Ⅰ and iron-carbon filler Ⅱ, the total copper content in the wastewater ...
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