Smelting Daily Question 8.26
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1. Please hide your replies; editing after posting is invalid! Delete directly without hiding! 2. Hiding method: http://bbs.hcbbs.com/thread-492556-1-1.html 1 B9 S# i( J3 \+ }8 J1 \ a 3. 5 points for correct answers; there is a reward for everyone who participates. Question: At present, China mainly uses four methods for the recycling of used computers. Please mention one or two. Answer: Choose 1 or 2 options: 1. Refurbish used computers and sell them in small cities or rural areas. 2. Manually disassemble used computers and use methods such as acid treatment and heating to extract valuable precious metals. 3. Collect the computers together to obtain useful materials, while sending residual materials such as plastics and printed circuit boards to landfills for disposal. 4. Mechanically crush used computers, then grind and separate them to extract precious metals; the wastewater can be reused, and the precipitates can be used as building materials or fillers. Almost no pollutants are emitted throughout this process
At present, the recycling of used computers in our country is mainly divided into four categories: The first category involves refurbishing the recycled used computers and selling them as second-hand units; chips with little recycling value are collected, while the old computer cases and monitors are discarded as waste. The second type involves small-scale dismantling on a household scale, followed by the use of acidic chemical liquids to dissolve the metals, with the residues being discarded carelessly in open areas, water sources, and other such places. The third category consists of enterprises of a certain scale, such as those in Taizhou, Ningbo, and Zhoushan in Zhejiang Province, which carry out centralized disassembly of used computers to obtain recycled materials; the remaining waste is then sent to landfills after being processed. The fourth category consists of the most advanced technologies in the country, namely setting up production lines for extracting precious metals from electronic waste. Used computers are mechanically crushed and then sent to a grinding process; water is added, and gravity shakers are used to separate recyclable metal materials such as copper, tin, and palladium. The wastewater is settled before being reused in the cycle.
Reply 1# chengjchyxl Traditional methods for recovering precious metals from used electronic and electrical equipment: pyrometallurgy, hydrometallurgy, and mechanical crushing. New methods for recovering precious metals from waste electronic and electrical equipment: electrolytic filtration, adsorption, and microbial leaching.
1. Recycling and reuse. 2. Disassembly of small workshops, with acid displacement to recover metals. 3. Large-scale enterprises concentrate on the separation and recycling of raw materials, with the remaining waste being disposed of as trash. 4. Establish a production line for recovering precious metals from electronic waste, to separate and recover various metal materials, and to make comprehensive use of the remaining waste.
Reuse after recycling, disassemble for recycling
Reply to 1# chengjchyxl to see what it contains
1. Corporate recycling, and electronic manufacturer recycling
Reply to 1# chengjchyxl: The first category involves taking in used computers, refurbishing them to sell as second-hand units; the chips that have little resale value are collected, while the old computer cases and monitors are discarded as waste. The second type involves small-scale dismantling on a household scale, followed by the use of acidic chemical liquids to dissolve the metals, with the residues being discarded carelessly in open areas, water sources, and other such places. The third category consists of enterprises of a certain scale, such as those in Taizhou, Ningbo, and Zhoushan in Zhejiang Province, which carry out centralized disassembly of used computers to obtain recycled materials; the remaining waste is then sent to landfills after being processed. The fourth category consists of the most advanced technologies in the country, namely setting up production lines for extracting precious metals from electronic waste. Used computers are mechanically crushed and then sent to a grinding process; water is added, and gravity shakers are used to separate recyclable metal materials such as copper, tin, and palladium. The wastewater is settled before being reused in the cycle.
Reply to 1# chengjchyxl: The first category involves taking in used computers, refurbishing them to sell as second-hand units; the chips that have little resale value are collected, while the old computer cases and monitors are discarded as waste. The second type involves small-scale dismantling on a household scale, followed by the use of acidic chemical liquids to dissolve the metals, with the residues being discarded carelessly in open areas, water sources, and other such places. The third category consists of enterprises of a certain scale, such as those in Taizhou, Ningbo, and Zhoushan in Zhejiang Province, which carry out centralized disassembly of used computers to obtain recycled materials; the remaining waste is then sent to landfills after being processed. The fourth category consists of the most advanced technologies in the country, namely setting up production lines for extracting precious metals from electronic waste. Used computers are mechanically crushed and then sent to a grinding process; water is added, and gravity shakers are used to separate recyclable metal materials such as copper, tin, and palladium. The wastewater is settled before being reused in the cycle.
Reply to 1# chengjchyxl: I saw this post and am very curious. I’m learning*learning*. Please don’t give me a rating.
Producer recycling； Classification, sorting, and recycling; secondary use is directed to underdeveloped areas...