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Preparation of lead carbonate from spent lead paste via chemical conversion

机译：通过化学转化由废铅膏制备碳酸铅

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Lead paste generated from spent and discarded lead acid battery has been converted to lead carbonate and lead oxides with a view to investigate a method for minimizing environmental pollution associated with spent lead paste recycling. The process includes four steps: namely desulfurization, leaching, carbonation and calcination, presented in the details as the follows. (1) In a spent lead paste, lead sulfate is the major component and is ac companied by lead oxides and metallic lead. On reacting the paste with (NH_4)_2CO_3, the PbSO_4 is converted to lead carbonate with (NH_4)_2SO_4, generated as a by-product (2) The desulfurized paste consisting of lead carbon ate and the unreacted lead oxides are then leached with an aqueous solution of nitric acid and H_2O_2. At a molar ratio of H to Pb> 2.5 and at a slurry density of 100 g - L~(-1) the extraction yield of lead from the paste into the aqueous solution is achieved up to 98.0%. (3) In the next step, the Pb (II) in the leaching solution is converted with the addition of Na_2CO_3 (aq) into a lead carbonate precipitate. It was found that under optimal conditions more than 99.9% of Pb can be extracted from the leaching solution into the solid lead carbonate phase. (4) In the final step, the lead carbonate is readily converted by thermal decomposition at a relatively low temperature of 350-450 °C into lead monoxide (PbO) or lead tetroxide powders (Pb_3O_4) that can serve as precursor for mak ing new lead paste and other lead products.
机译：从废旧铅酸电池中产生的铅膏已被转化为碳酸铅和氧化铅，目的是研究一种减少与废铅膏回收相关的环境污染的方法。该过程包括四个步骤：脱硫，浸出，碳酸化和煅烧，详细介绍如下。 （1）在废铅膏中，硫酸铅是主要成分，并伴有氧化铅和金属铅。糊状物与（NH_4）_2CO_3反应后，PbSO_4与（NH_4）_2SO_4转化为碳酸铅，作为副产物生成（2）。然后，用铅酸铅和未反应的氧化铅组成的脱硫糊状物被浸出。硝酸和H_2O_2的水溶液。在H与Pb> 2.5的摩尔比和100 g-L〜（-1）的浆料密度下，铅从糊剂中提取到水溶液中的提取率可达到98.0％。 （3）在下一步中，通过添加Na_2CO_3（水溶液）将浸出溶液中的Pb（II）转化为碳酸铅沉淀。发现在最佳条件下，可以从浸出溶液中将99.9％以上的Pb提取到固态碳酸铅相中。 （4）在最后一步中，碳酸铅很容易在350-450°C的较低温度下通过热分解转化成一氧化铅（PbO）或四氧化铅粉末（Pb_3O_4），可以用作制造新产品的前体。铅膏等铅制品。

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