高掺量酸浸锰渣烧结试块的制备及其机理的研究

本文以酸浸锰渣为主要原料制备烧结试块,研究了烧成温度、成型压力、粘土掺入量和电石渣掺入量等因素对试块抗压强度和相组成结构的影响。结果表明:当烧成温度1100℃,成型压力15 MPa,酸浸锰渣81%,粘土掺量9%,电石渣掺量10%时,烧结试块的抗压强度达到最大,可达到63.52 MPa;该条件下的XRD分析表明,鳞石英、钙硅石等新晶相生成,硬石膏含量增大,以赤铁矿、石英和硬石膏为骨架,赋予试样强度,硬石膏含量的增大说明起到了固硫的作用,环保效益明显。

酸浸锰渣基砂浆混凝土的制备及其性能的研究

试验利用酸浸锰渣、水泥、粉煤灰、标准砂等原料来研制酸浸锰渣基砂浆混凝土。探索了浇注成型时水固比、酸浸锰渣掺量、粉煤灰取代量、养护方式等因素对混凝土力学性能的影响。结果表明最佳的条件为:水固比0.6、酸浸锰渣60%、水泥36%、粉煤灰4%、灰砂比1:3、自然养护。另外通过XRD等手段分析得知胶凝材料在养护过程中产生的水化产物能有效提升制品的力学性能。

酸浸锰渣基双免砖的制备及抗压强度的影响因素研究

以酸浸锰渣、粉煤灰、水泥等作为原料,采用压制成型的方法制备酸浸锰渣基双免砖。研究了水固比、成型压力、酸浸锰渣掺量、粉煤灰取代水泥量、养护方式等因素对制品抗压强度的影响规律。结果表明:在本实验条件下,合适的水固比为0.15、成型压力为20 MPa;以抗压强度为考量指标,最佳配比为酸浸锰渣59.5%、水泥35.7%、粉煤灰4.8%,制品28 d抗压强度可达43.4 MPa。

利用锰矿酸浸废渣制备免烧砖的研究

以酸浸锰渣、石灰和水泥为主要原料,用河砂作为骨料,采用压力成型的方法制备锰渣免蒸免烧砖的研究。采用单因子试验法确定了最佳的成型压力,并对影响强度的胶砂比进行了分析。采用正交试验法研究了原料的最佳配合比。通过测试免烧砖的抗压强度和利用扫描电镜、X射线衍射分析(XRD)研究了免烧砖性能与强度形成机理。最佳成型压力为25MPa,原料配比为:酸浸锰渣35%、河砂45%、水泥13%、生石灰7%,水固比0.3。

Preparation of electronic grade manganese sulfate from leaching solution of ferromanganese slag

Preparation of electronic grade manganese sulfate from ferromanganese slag, including grinding, leaching and purification, was studied. The impurities, such as Fe3+, Al3+, Ca2+, Mg2+, heavy metal ions and Na+, K+, were removed from leaching solution by neutralized-hydrolysis, fluorination precipitation, sulfuration precipitation and re-crystallization. Effects of pH of reaction, temperature and dosage of the different additives on removal rates of the metallic ions in leaching solution were investigated, and the suitable temperature, pH and the added amount of precipitating agent were obtained. The prepared manganese sulfate product, of which the mass fractions of Ca2+, Mg2+, Na+, K+ are all smaller than 0.005%, the mass fractions of Fe3+, Al3+ and heavy metal ions are smaller than 0.001%, and the mass fraction of Mn2+ is greater than 32%, can meet the demand of anode materials of lithium-ion batteries.