High Efficiency Recovery of Valuable Metals from Ceramics Scraps by Hydrothermal Mechanochemical Method

在这个项目中，我们已经完成了接下来的实验，并获得了接下来的结果：从WC-Cocermet中提取钴相的氢热提取过程被委托建立了一个WC-Cocermet碎片的新颖回收系统。当Cermeter芯片在110℃以上的羟基酸中被羟基治疗时，钴结合阶段被有效地提取，而Cermeter芯片则被分散到相对较大的碎片中。在进行羟基治疗后， WC内的身体变得非常小和容易被球铣削和平均颗粒大小的那些产生的WC颗粒变得与Virginia WC颗粒相似。“回收的WC粉比普通的WC粉更容易进行毒性氧化，因此回收的WC-可可粉的机械性质已经退化。”However，机械性能的退化是由干燥WC粉末更小心地预先准备的。这一过程将是回收系统的一部分。 ... More r WC-Cocermet. WC-Cocermet. WC-Cocermet. WC-Cocermet. WC-Cocermet在110-200℃的温度下对各种WC颗粒大小和钴含量进行了水热处理，持续时间为6- 240 h该公司最好地进入酸性溶液，但当WC被氧化化以防止WO_3水合物被过滤时，它被过滤分不开。水热治疗参数如溶解性集中性、治疗温度、保持时间在尊重不同类型的WC-可可细胞的最佳状态下。在3 M HNO_3 aqueous solution at 150℃ for 24 h was capable of fully disintegrating the cermet chip composed of coarse WC grains of 1-5 = m in size with 20 mass% of Co as binder。当更多的抗氧化剂制剂由0.5-1.0 = m的精细WC颗粒组成，尺寸为13质量%的Co，在170℃的24小时内完全被分解为7 M HNO_3的解决方案。过滤solid residues were composed of wine WO_3·0.33 H_2 O powder and a small amount of WO_3。恢复的WO_3·0.33 H_2 O火药可以很容易地恢复到WC火药合成的工业过程中，因为所有的回收成本可能很低。对使用的Nd-Fe-B永久磁铁的羟基治疗被调查，以有效地恢复稀有地球资源。在<14>110℃的6 h中混合氢氯酸溶液（3.0 mol/dm^3）和氧酸（0.2 mol/dm^3）的混合溶液中，提供了Ni-coated Nd_2 Fe_B sintered magnet。作为一个结果，磁铁中含有的Nd金属超过99%，作为Nd_2（C_2O_4）3的固体精确度，xH_2O的纯度高达99.8%。Less（低）

In this project, we carried out the following experiments and obtained the following results :Hydrothermal extraction process of Co binder phase from WC-Co cermet was investigated in order to establish a novel recycling system of WC-Co cermet scraps. When the cermet chips were hydrothermally treated in hydrochloric acid above 110℃, Co binding phase was efficiently extracted and the cermet chips were disintegrated into relatively large fragments. After hydrothermal treatment, WC sintered body became very brittle and pulverized easily by ball milling and the mean particle size of thus obtained WC particle became similar to that of virginal WC particle. The recycled WC powder was a little easier to undergo oxidation than the virginal WC powder, so that the mechanical properties of recycled WC-Co cermet were degraded. However, the degradation of mechanical properties was prevented only by drying the WC powder more carefully. This hydrothermal process will be one of the recycling systems fo … More r WC-Co cermet.The WC-Co cermet specimens with various WC particle sizes and Co content were hydrothermally treated in HNO_3 aqueous solutions at temperatures of 110-200℃ for duration of 6-240h. The Co was preferentially leached out into the acidic solution, while the WC was oxidized to insoluble WO_3 hydrate which was subsequently separated by filtration. The hydrothermal treatment parameters such as solvent concentrations, treatment temperatures, holding time were optimized in respect to different kinds of WC-Co cermets. A hydrothermal oxidation treatment in 3M HNO_3 aqueous solution at 150℃ for 24h was capable of fully disintegrating the cermet chip composed of coarse WC grains of 1-5 〓m in size with 20 mass% of Co as binder. While the more oxidation resistant specimen composed of fine WC grains of 0.5-1.0 〓m in size with 13 mass% of Co, was completely disintegrated by a treatment in 7M HNO_3 aqueous solution at 170℃ for 24h. The filtered solid residues were composed of fine WO_3・0.33H_2O powder and a small amount of WO_3. The recovered WO_3・0.33H_2O powder can be easily returned to the industrial process for the synthesis of WC powder so that the overall recycling cost can be possibly lowered.The hydrothermal treatment of used Nd-Fe-B sintered permanent magnet was investigated in order to recover the rare-earth resources efficiently. Commercially available Ni-coated Nd_2Fe_<14>B sintered magnet was hydrothermally treated under the optimum conditions at 110℃ for 6h in the mixed aqueous solution of hydrochloric acid (3.0mol/dm^3) and oxalic acid (0.2mol/dm^3). As a result, more than 99% of Nd metal contained in the magnet was collected as solid precipitate of Nd_2(C_2O_4)3・xH_2O with the purity as high as 99.8%. Less