scispace - formally typeset
Search or ask a question
Author

Yu Miao

Bio: Yu Miao is an academic researcher from Tsinghua University. The author has contributed to research in topics: Tin & Printed circuit board. The author has an hindex of 3, co-authored 8 publications receiving 48 citations.

Papers
More filters
Journal ArticleDOI
Yu Miao1, Xianlai Zeng1, Qingbin Song1, Lili Liu1, Jinhui Li1 
TL;DR: In this paper, the results showed that previous etching solution (e.g., ammonium persulfate, sulfur/chromic acid, sulfuric acid/hydrogen peroxide, sodium chloride, ferric chloride) caused severe pollution without proper disposal.

31 citations

Journal ArticleDOI
TL;DR: The proposed approach can be expected to significantly reduce energy consumption for recycling metals from WPCBs, without additional waste solution generated, and to increase the potential value of WTSS and WES, as they can facilitate the recycling process.

22 citations

Journal ArticleDOI
TL;DR: In this paper, the authors summarized the overall solution of waste CRT glass, divided into three main procedures: the first step is CRT separation technology and equipment, including thermal-shock method with strong technical adaptation, simple operation and widely used nowadays; diamond-cutting method, efficiency and with high cutting speed; or ultrasonic-chemical separation method, using ultrasonic wave to promote the dissolution of low melting glass and reduce the concentration of acid solution.
Abstract: Cathode-ray tube (CRT) display has entered the peak period of elimination, therefore, the disposal of waste CRT glass is becoming an urgent problem to be solved. At present, there are already many scholars having done a lot of researches on this problem, but most of them are constrained in some details of the disposal process, lack of research and development on the complete technical route of waste CRT glass. This paper highly summarized the overall solution of waste CRT glass, divided into three main procedures: the first step is CRT glass separation technology and equipment, including thermal-shock method with strong technical adaptation, simple operation and widely-used nowadays; diamond-cutting method, efficiency and with high cutting speed; or ultrasonic-chemical separation method, using ultrasonic wave to promote the dissolution of low melting glass and reduce the concentration of acid solution. The second step is water-ball milling cleaning technology and equipment, high cleaning efficiency, reducing dust and saving water, combined the traditional wet and dry cleaning technology. The third step is resource re-utilization, in which the direct use of CRT glass containing the leaded glass produces crystal glass and low lead fluorescent tube, and lead-free panel glass manufactures foam glass and glass beads; and the indirect use, comprising lead fire-extraction divided into collaborative smelting and electric furnace smelting, and lead mechanical-activation hydrometallurgy extraction, reducing the concentration of acid and improving the recovery rate. According to the existing technologies and equipment from your factory, the selection of appropriate technologies to deal with CRT glass achieves effective resource recycling and environmentally sound management goals.

14 citations

Patent
Li Jinhui, Yu Miao, Liu Lili, Deng Chao, Wang Jin 
10 Feb 2016
TL;DR: In this paper, a method for digesting soldering tin from a waste circuit board was proposed, which is convenient and practical in operation process and low in cost, and has very important significance for environment protection.
Abstract: The invention discloses a method for digesting soldering tin from a waste circuit board. The method comprises the following steps: the waste circuit board is dipped in soldering tin removing waste liquid for 80 to 120 minutes. In the above dipping step, the temperature is normal temperature; the dipping time is specifically 100 minutes and 110 minutes; and the solid-to-liquid ratio of the waste circuit board to the soldering tin removing waste liquid is 1g:(2-36)ml. According to the method for digesting soldering tin from the waste circuit board without heating provided by the invention, the soldering tin on the circuit board can be totally dissolved; components are naturally separated from the circuit board; waste discharge caused by other processes such as high-temperature heating which are used for removing the soldering tin is avoided, and the influence on copper recycle in the waste circuit board caused by soldering tin residues is also avoided; and the soldering tin removing waste liquid can be recycled for recycling high-concentration soldering tin. The method is convenient and practical in operation process and low in cost, and has very important significance for environment protection; the soldering tin on the waste circuit board is digested; and the soldering tin removing waste liquid is subjected to resource reutilization.

2 citations

Patent
09 Mar 2016
TL;DR: In this paper, a method for extracting copper from waste circuit boards is described, which comprises the steps that the circuit boards are crushed and then placed into a waste etching solution to be stirred for 20-60 min, and the process for extracting the copper from the waste circuit board is finished.
Abstract: The invention discloses a method for extracting copper from waste circuit boards. The method comprises the steps that the waste circuit boards are crushed and then placed into a waste etching solution to be stirred for 20-60 min, and the process for extracting the copper from the waste circuit boards is finished. Tests prove that by the adoption of the method, the copper on the waste circuit boards is extracted; the amount of generated waste liquid is reduced by using the waste etching solution; the operation process is simple and feasible, the cost is low, and the method has great significance for environment protection.

1 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: A systematic literature review on the analytic hierarchy process's support for decision making for sustainable development is conducted, making it possible to identify gaps and future research pathways and substantially elucidate the advancements in the state-of-the-art of the analytic Hierarchy process.

242 citations

Journal ArticleDOI
TL;DR: This study highlights the outstanding electrocatalytic performance, the rapid mass-transfer kinetics, and the excellent stability of the CNT/GF electrode, and provides an energy-efficient and zero-emission strategy for the regeneration of etchant waste.
Abstract: Developing effective technologies for treatment of spent etchant in printed circuit boards industries is of paramount for sustainable copper reuse and reducing copper discharge. We developed a novel closed-loop electrochemical cell for on-site regeneration of spent acidic cupric chloride etchant. It does not have any emissions and recycles all the copper using a three-dimensional graphite felt anode decorated with carbon nanotube (CNT/GF). The CNT/GF anode oxidizes Cu(I) to Cu(II) so that the spent cuprous chloride can be converted to cupric chloride and reused. The decorated CNT layer with abundant oxygen-containing functional groups significantly enhanced the electrocatalytic activity for Cu(II)/Cu(I) redox. The CuCl32– is oxidized to CuCl+ at the anode and the CuCl+ is reduced to Cu(0) at the cathode. The closed-loop cycle system converts the catholyte into the anolyte. On average, the energy consumption of Cu(I) oxidation by CNT/GF is decreased by 12%, comparing to that by untreated graphite felt. The...

48 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used material flow analysis to quantify and systematically analyze the flow of obsolete TVs from households in urban areas in Vietnam and found that 75% of total base metals contained in obsolete TVs was reused or recycled; the rest (25%) was exported or emitted, representing the loss of materials for the Vietnamese economy.
Abstract: Electronic waste has become one of the fastest growing waste streams in Vietnam, of which adequate information on its size and its flows is very crucial to efficiently manage it and prevent associated environmental problems. To obtain such information, Material Flow Analysis (MFA) was used to quantify and systematically analyze the flow of obsolete TVs from households in urban areas in Vietnam. The results showed a gradual increase of obsolete TVs during the period 1966–2035. Further investigation showed that 66% of the total obsolete TVs in 2012 was directly reused or reused after repair/refurbishing, 3% was domestically recycled or open burned to recover valuable materials, 9% was illegally exported and the rest of 22% was open dumped. Substance flow analysis showed that 75% of total base metals (i.e., Cu, Al, Fe/steel) contained in obsolete TVs was reused or recycled; the rest (25%) was exported or emitted, representing the loss of materials for the Vietnamese economy. For precious metals (i.e., Au, Ag, Pd), plastic and glass, a larger material leaching was noticed. About 34% was illegally exported (in case of precious metals and plastics) or open dumped (in case of glass). The analysis also revealed the heavy involvement of the informal sector in the TV waste management system, making it more complicated, difficult to control and resulting in potential risks to the environment and human health. Based on the above analysis, an integrated management system was proposed to manage the secondary material source and prevent potential harmful effects.

44 citations

Journal ArticleDOI
TL;DR: In this article, the feasibility of using hazardous waste cathode ray tube (CRT) funnel glass to replace high density mineral aggregates in the radiation shielding concrete, various barite concrete samples were prepared with portland cement, ground funnel glass sand as the substitute for barite aggregates, and fly ash as mineral admixtures, and the rates of funnel glass for fine and coarse (5-10mm) barite aggregate were 25, 50, 75, 100% and 10, 20, 30%, respectively.

27 citations