KR-20260065953-A - Method for separating and recovering rare earth and metal components from microplastic waste before manufacturing degreasing or microplastic waste after manufacturing degreasing

KR20260065953AKR 20260065953 AKR20260065953 AKR 20260065953AKR-20260065953-A

Abstract

A method for separating and recovering rare earth components and metal components from micro-waste is provided. The separation and recovery method comprises: (A) a process of preparing micro-waste prior to manufacturing degreasing, comprising a magnetic metal powder, a ceramic powder, a rare earth powder, and a resin component, wherein the metal powder and the ceramic powder are at least partially attached to each other; (B) a process of micro-waste prior to manufacturing degreasing by grinding; (C) a process of separating and recovering the metal powder-containing material and the rare earth powder-containing material using a magnet after passing through process (B); (D) a process of producing a rare earth component-containing solution in which the rare earth powder is dissolved by dissolving the rare earth powder-containing material in an inorganic acid; (H) a process of producing a metal component-containing solution in which the metal powder is dissolved by dissolving the metal powder-containing material in an inorganic acid; and (E) a process of recycling and degreasing the resin component from the micro-waste prior to manufacturing degreasing between processes (A), (D), and (H).

Inventors

야마구치 켄이치
하마다 다이스케

Assignees

가부시키가이샤 무라타 세이사쿠쇼

Dates

Publication Date: 20260511
Application Date: 20240726
Priority Date: 20231129

Claims (14)

(A) A process for preparing microplastic waste before degreasing, which is a pre-sintering pre-degreasing waste discharged from a manufacturing process of a multilayer ceramic capacitor, comprising a magnetic metal powder, a ceramic powder, a rare earth powder, and a resin component, wherein the metal powder and the ceramic powder are at least partially attached to each other; and (B) A process of micronizing the micron waste before manufacturing degreasing by grinding, and (C) A process for separating and recovering the micro-waste before manufacturing degreasing after undergoing the above process (B) into a metal powder containing the metal powder and the ceramic powder and a rare earth powder containing the rare earth powder and the ceramic powder using a magnet, and (D) A process of dissolving the rare earth powder containing material after the above process (C) in at least one inorganic acid selected from the group comprising sulfuric acid, nitric acid, and hydrochloric acid, thereby precipitating the ceramic powder in the rare earth powder containing material and producing a rare earth component containing solution in which the rare earth powder in the rare earth powder containing material is dissolved as a rare earth component, and (H) A process of dissolving the metal powder containing material after the above process (C) in at least one inorganic acid selected from the group comprising sulfuric acid, nitric acid, and hydrochloric acid, thereby precipitating the ceramic powder in the metal powder containing material and producing a metal component containing solution in which the metal powder in the metal powder containing material is dissolved as a metal component, and (E) A method for separating and recovering rare earth components and metal components from microwaste prior to manufacturing degreasing, comprising a process of recycling degreasing the resin components from microwaste prior to manufacturing degreasing between the above process (A), the above process (D), and the above process (H).
In paragraph 1, A method for separating and recovering rare earth components and metal components from microwaste before manufacturing degreasing, wherein the above process (E) is a process of recycling degreasing the resin component from microwaste before manufacturing degreasing between the above process (A) and the above process (B), recycling degreasing the resin component from microwaste before manufacturing degreasing between the above process (B) and the above process (C), or recycling degreasing the resin component from each of the metal powder containing material after passing through the above process (C) and the rare earth powder containing material after passing through the above process (C) between the above process (C), the above process (D), and the above process (H).
In paragraph 1 or 2, A method for separating and recovering rare earth components and metal components from microscopic waste prior to manufacturing degreasing, wherein the degreasing temperature during recycling degreasing in the above process (E) is 600°C or higher and 1000°C or lower.
In any one of paragraphs 1 through 3, The ceramic powder comprises a first ceramic powder and a second ceramic powder having a smaller particle size than the first ceramic powder. In the above metal powder containing, the metal powder and the second ceramic powder are at least partially attached to each other, A method for separating and recovering rare earth components and metal components from microscopic waste prior to manufacturing degreasing, wherein, in the above rare earth powder containing, the rare earth powder and the first ceramic powder are at least partially attached to each other.
In any one of paragraphs 1 through 4, (F) A method for separating and recovering rare earth components and metal components from microscopic waste before manufacturing degreasing, further comprising a process of separating solid and liquid from the rare earth component-containing solution containing the precipitated ceramic powder.
In paragraph 5, A method for separating and recovering rare earth components and metal components from microscopic waste before manufacturing degreasing, further comprising a rare earth component concentration process for concentrating the rare earth components in the solution containing the rare earth components after the process (F) above.
In any one of paragraphs 1 through 6, (G) A method for separating and recovering rare earth components and metal components from microscopic waste before manufacturing degreasing, further comprising a process of precipitating and recovering the rare earth components by neutralizing the solution containing the rare earth components.
In Paragraph 7, A method for separating and recovering rare earth components and metal components from microscopic waste prior to manufacturing degreasing, wherein in the above process (G), the rare earth components are recovered by adjusting the solution containing the rare earth components to a pH of 6 or higher and a pH of 9 or lower.
In any one of paragraphs 1 through 8, A method for separating and recovering rare earth components and metal components from microscopic waste prior to manufacturing degreasing, wherein in the above process (D), the solution containing the rare earth component is adjusted to have a pH of 1.5 or higher and a pH of 2.5 or lower by adding the above inorganic acid.
In any one of paragraphs 1 through 9, A method for separating and recovering rare earth components and metal components from microscopic waste prior to manufacturing degreasing, wherein the metal component is Ni and the ceramic powder is BaTiO3 .
In any one of paragraphs 1 through 10, A method for separating and recovering rare earth components and metal components from microscopic waste prior to manufacturing degreasing, wherein the rare earth component is at least one of Dy, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Ho, Er, Tm, Yb, and Lu.
In any one of paragraphs 1 through 11, A method for separating and recovering rare earth components and metal components from microscopic waste prior to manufacturing degreasing, wherein the above processes (A), (B), (C), and (E) are carried out in a dry state.
(A) A process for preparing micro-waste after manufacturing degreasing, which is a sintering transitional waste discharged from a manufacturing process of a multilayer ceramic capacitor, comprising a magnetic metal powder, a ceramic powder, and a rare earth powder, wherein the metal powder and the ceramic powder are at least partially attached to each other, and wherein the resin component is degreased in the manufacturing process. (B) A process of micronizing the micron waste after the above-mentioned manufacturing degreasing by grinding, and (C) A process for separating and recovering the micro-waste after manufacturing degreasing following the above process (B) into a metal powder containing the metal powder and the ceramic powder and a rare earth powder containing the rare earth powder and the ceramic powder using a magnet, and (D) A process of dissolving the rare earth powder containing material after the above process (C) in at least one inorganic acid selected from the group comprising sulfuric acid, nitric acid, and hydrochloric acid, thereby precipitating the ceramic powder in the rare earth powder containing material and producing a rare earth component containing solution in which the rare earth powder in the rare earth powder containing material is dissolved as a rare earth component, and (H) A method for separating and recovering rare earth components and metal components from microscopic waste after manufacturing degreasing, comprising a process of dissolving the metal powder containing the metal powder after the above process (C) in at least one inorganic acid selected from the group including sulfuric acid, nitric acid, and hydrochloric acid, thereby precipitating the ceramic powder in the metal powder containing the metal powder and producing a metal component containing solution in which the metal powder in the metal powder containing the metal component is dissolved as a metal component.
In Paragraph 13, A method for separating and recovering rare earth components and metal components from microscopic waste after manufacturing degreasing, wherein the above processes (A), (B), and (C) are carried out in a dry state.

Description

Method for separating and recovering rare earth and metal components from microplastic waste before manufacturing degreasing or microplastic waste after manufacturing degreasing The present invention relates to a method for separating and recovering rare earth components and metal components from microscopic waste before or after manufacturing degreasing discharged in the manufacturing process of a multilayer ceramic capacitor. There is expected to be a significant demand for Multilayer Ceramic Capacitors (MLCCs) as electronic components installed in automobiles and mobile phones. A Multilayer Ceramic Capacitor comprises a laminate having an internal electrode layer and a ceramic layer, and an external electrode. The internal electrode layer contains a metal component, such as Ni, for example, and the ceramic layer is formed, for example, BaTiO3 . Patent documents 1 to 4 disclose a method for recovering Ni, which is mainly used in the internal electrode layer, and also disclose separating BaTiO3 contained in the ceramic layer during the process of recovering Ni. FIG. 1 is a flowchart illustrating a separation and recovery method for separating and recovering rare earth components and metal components from micro-sintering waste before manufacturing degreasing and before firing (firing of stacked chips) discharged from a manufacturing process of a multilayer ceramic capacitor according to a first embodiment of the present invention. FIG. 2 is an external perspective view showing an example of a multilayer ceramic capacitor according to a first embodiment of the present invention. Figure 3 is a cross-sectional view along line III-III of Figure 2. FIG. 4 is a cross-sectional view parallel to the plane including the longitudinal direction and the stacking direction in a stacked chip. Figure 5 is an enlarged view of part α of Figure 4 and is a schematic diagram showing the state of various powders. FIG. 6 is a flowchart illustrating a separation and recovery method for separating and recovering rare earth components and metal components from micro-waste after degreasing and before degreasing in the manufacturing process of a multilayer ceramic capacitor according to a second embodiment of the present invention. <First Embodiment> 1. Separation and recovery method A method for separating and recovering rare earth components and metal components from micro-waste before degreasing and before firing (firing of stacked chips) discharged during the manufacturing process of a multilayer ceramic capacitor according to the first embodiment of the present invention is described. FIG. 1 is a flowchart illustrating a separation and recovery method for separating and recovering rare earth components and metal components from micro-sintering waste discharged from the manufacturing process of a multilayer ceramic capacitor according to a first embodiment of the present invention. In the separation and recovery method according to the first embodiment of the present invention, micro-sintering waste discharged from the manufacturing process of a multilayer ceramic capacitor before degreasing is used as the starting point for separation and recovery. Micro-sintering waste before degreasing is described. (1) Microwaste before manufacturing degreasing Before describing the micro-waste prior to manufacturing degreasing, first, the multilayer ceramic capacitor manufactured by the manufacturing process of the multilayer ceramic capacitor and the manufacturing process thereof are described below. (1-1) Multilayer ceramic capacitor FIG. 2 is an external perspective view showing an example of a multilayer ceramic capacitor according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2. Here, a two-terminal multilayer ceramic capacitor is described as an example of a multilayer ceramic capacitor (10). As shown in FIGS. 2 and 3, the multilayer ceramic capacitor (10) includes, for example, a rectangular-shaped laminate (12) and external electrodes (30) disposed at both ends of the laminate (12). The laminate (12) has a plurality of laminated ceramic layers (14) and a plurality of internal electrode layers (16) laminated on the ceramic layers (14). Furthermore, the laminate (12) has a first main surface (12a) and a second main surface (12b) facing in the height direction (laminar direction) (x), a first side surface (12c) and a second side surface (12d) facing in the width direction (y) orthogonal to the height direction (x), and a first cross surface (12e) and a second cross surface (12f) facing in the length direction (z) orthogonal to the height direction (x) and the width direction (y). The ceramic layers (14) and the internal electrode layers (16) are laminated in the height direction (x). The first internal electrode layer (16a) and the second internal electrode layer (16b) may be composed of a conductive material including, for example, a magnetic metal, and the magnetic me