| Lead-acid batteries are widespread use in cars, electric cars, motorcycles, mobile communication base station, national defense equipment, etc. In our country, it scrapped lead-acid batteries more than 300 million a year, which leads to more than 300 ten thousand tones, so clean renewable waste lead-acid storage battery is the objective demand of social economy. Battery fragmentized separation for the desulfurization of lead paste is a key link in the process of clean regeneration of battery, national industrial policy requirements to recycling of by-products in the process of the desulfurization. In this paper,we studied a new method of lead paste preliminary desulphurization purification and crystallization of sodium sulfate solution。First, this paper, for the lead paste sodium sulfate in the desulphurization by-product recovery problem, proposed to recovery simulation in sodium sulfate solution by ethanol solvent crystallization. Paper formed an experimental system of crystal and recovery ethanol, discussed the amount of ethanol, concentration of the simulate the sodium sulfate solution and crystallization time the three factors of ethanol solvent recovery of sodium sulfate crystallization. The experimental results show that, the greater the amount of ethanol to join, the faster the precipitation of sodium sulfate crystals and exhalation rate is higher; The concentration of simulation of liquid sodium sulfate is higher, the solution is more close to the saturated solution, under the effect of ethanol, it is easy to precipitate a lot of crystals; And sodium sulfate crystallization time on crystals precipitation effect is not obvious; These three factors the influence degree of the size of this experiment: concentration of sodium sulfate solution > the amount of ethanol > crystallization time. The experiments of crystallization product for ten water sodium sulfate, heavy metal impurity content < 20 PPM.Second, in this paper, to solve the heavy metal purification problems of lead battery lead paste pre desulphurization by-product sodium sulfate solution, respectively adopted three levers to deal with Pb2+, Cu2+ and Cd2+ simulation of heavy metals liquid; The first one is adopt the method of static adsorption by activated carbon, studied the amount of activated carbon, initial concentration of simulation of heavy metals liquid, adsorption time, temperature and pH these five factors, respectively, on the influence of three kinds of heavy metal removal. Under the optimal conditions, Pb2+ removal rate was 91.23%, Cu2+ removal rate was 93.25%, Cd2+ removal rate was 62.13%;The second one is set up activated carbon fixed bed, examined the influence of the bed height, rate of feed and initial concentration of simulation of heavy metals solution these three factors on the heavy metals through the curve. The third one is using activated carbon fixed bed + resin combination technology absorption of heavy metal ions, choose the same factors with the second method. The purification ability of three methods turn for activated carbon fixed bed + static adsorption resin, activated carbon fixed bed, static adsorption activated carbon. |
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