Method for recovering lead oxide from waste containing lead oxide
A technology containing lead oxide and lead oxide, applied in the field of lead oxide recovery, can solve the problems of large consumption of chemical raw materials, low purity, high recycling cost, etc., and achieve the effect of eliminating secondary pollution and shortening the process flow
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[0040] According to a preferred embodiment of the present invention, the precipitating agent is selected from one or more of carbon dioxide, sulfur dioxide and sulfur trioxide, and the method for recovering lead oxide from waste containing lead oxide preferably further includes the step ( 3) The gas obtained by the desalination and decomposition of the lead salt precipitation is recycled as the precipitating agent described in step (2), which can achieve the requirements of atomic economic reaction, thereby achieving zero consumption and zero emission, and has more industrial application prospects.
[0041] According to another preferred embodiment of the present invention, the precipitation agent is selected from one or more of ammonium sulfate, ammonium oxalate and ammonium carbonate, and the method for recovering lead oxide from waste containing lead oxide preferably further comprises: Step (2) The ammonia solution formed by the ammonia gas produced by the reaction is used in t...
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[0068] Example 1
[0069] This example is used to illustrate the method for recovering lead oxide from waste materials containing lead oxide provided by the present invention.
[0070] The lead oxide-containing waste (930g) used in this example is lead-containing flue ash from Huitong smelter. After analysis, it mainly contains 69% by weight of PbO, and the rest is a small amount of SnO 2 , CaSiO 3 , Al 2 O 3 And SiO 2 Other insoluble impurities, the amount of PbO equivalent to 2.9mol.
[0071] The lead oxide recovery process is as follows:
[0072] (1) Add 10 liters of ethylenediamine diacetic acid aqueous solution with a temperature of 45° C. and a concentration of 0.5 mol / L to the above-mentioned lead oxide-containing waste, stir the reaction for 20 minutes, and then press filter the reaction product to obtain lead-containing filtrate and filter residue.
[0073] (2) Heat the above-mentioned lead-containing filtrate to 70°C and pass in 3.0 mol of sulfur dioxide, then keep the reactio...
Example Embodiment
[0075] Example 2
[0076] This example is used to illustrate the method for recovering lead oxide from waste materials containing lead oxide provided by the present invention.
[0077] The lead oxide-containing waste material used in this example is lead-containing flue ash from a gold-lead smelter. After analysis, it mainly contains 63% PbO and 8% PbSO by weight. 4 , The rest is a small amount of Al 2 O 3 And SiO 2 And other insoluble impurities.
[0078] The pretreatment process (pre-desalination treatment) is as follows:
[0079] Because the main components of the lead oxide-containing waste are PbO and PbSO 4 , Only need to pre-desalinate waste materials containing lead oxide. Take 1.6 kg of the above-mentioned lead oxide waste (4.942 mol equivalent to PbO) and put it into 0.5 liter of 2mol / L NaOH for desalination reaction, control the reaction temperature to 60°C, stir and react for 10 minutes and filter to obtain the pretreated lead-containing material .
[0080] The lead oxide ...
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