6 results about "Electronic scrap" patented technology

The application provides a method for efficiently recycling valuable elements by synergistically smelting neodymium iron boron waste and electronic waste, which comprises the following steps: preparing a mixture of powdered neodymium iron boron waste, fine-grained electronic waste, a slagging agent and a solid reducing agent; and using a top-blown smelting furnace to oxidize and reduce the mixture; by controlling the conditions of the oxidation process, the iron and rare earth in the mixture are oxidized into oxides and enter the slag, copper is not oxidized and captures rare and precious metals such as gold and silver to form crude copper and sink to the bottom of the furnace and is discharged; by controlling the conditions of the reduction process, the iron oxide in the mixed rare earth slag is reduced to metallic iron, and the rare earth oxide is not reduced and remains in the slag layer; the iron with a larger density than the rare earth slag sinks to the bottom of the furnace, and after static stratification, the iron and the rare earth slag are discharged from the metal outlet and the slag outlet respectively, so that the separation of the rare earth and the iron is realized; and finally, the synchronous recovery of the rare earth, the iron in the neodymium iron boron waste and the copper, gold and silver in the electronic waste is realized; the method has a short process flow, low energy consumption and good economic and environmental benefits.

A method for obtaining metals of the 8th to 14th groups, in particular raw copper, comprises the following steps: i) providing and melting down a mixed feed comprising electronic waste in a smelting reactor, so that a first melt with a first metallic phase and a first slag phase is formed; ii) separating out the first slag phase from the smelting reactor; iii) refining the remaining first metallic phase by means of an oxygen-containing gas, possibly with the addition of copper-containing residual materials, so that a second, copper-enriched slag phase is formed; iv) possibly separating off the second slag phase and repeating the step; v) separating off the refined first metallic phase from the smelting reactor; and vi) adding a further mixed feed comprising electronic waste to the remaining second, copper-enriched slag phase and repeating process steps i) to vi).

This disclosure concerns the evaluation of a noble metal content in batches of materials such as electronic scrap, and in particular printed circuit boards, which is an essential initial step when recycling is envisaged. A process is presented comprising the steps of: —imaging at least a statistical representative number of the boards of the batch; —processing the images to detect the printed circuit boards; —for each detected printed circuit board, extracting a board-related feature vector using image processing technology; and, —providing a model taking at least the board-related feature vectors as input and calculating the noble metal content of the batch as output, wherein the model is calibrated against batch-level noble metal assays. The present application deals directly with batches of printed circuit boards, allowing for an approach wherein a regression model is calibrated based on total batch assays. Printed circuit board component assays are not needed.

This application relates to a waste electronic metal pyrolysis recycling device, belonging to the technical field of electronic waste metal pyrolysis recycling. It includes a pyrolysis furnace, with a storage bin above the furnace. A first connecting pipe is fixedly connected to the bottom of the storage bin, and a second connecting pipe is fixedly connected to the bottom of the first connecting pipe. This application, by incorporating components such as an auger, a scale, and a solenoid valve, allows the reducing agent in the storage bin to fall into the second connecting pipe through the first connecting pipe during the pyrolysis of waste electronic materials. Starting a first motor drives a rotating rod and an auger to rotate, allowing the reducing agent to enter a measuring cylinder. The measuring cylinder and scale facilitate observation of the reducing agent level, thus allowing for determination of the dosage of reducing agent based on the amount of waste electronic materials. Opening the solenoid valve allows the third connecting pipe to input the reducing agent into the pyrolysis furnace, where it mixes with the waste electronic materials. This device enables the quantitative addition of reducing agent during the pyrolysis of waste electronic materials, significantly improving the metal recovery rate.

This invention provides a method for recovering valuable elements from NdFeB waste through co-reduction smelting of electronic waste. The method involves mixing powdered NdFeB waste and fine-grained electronic waste with a slagging agent and a solid reducing agent, and then using a top-blown smelting furnace to reduce and smelt the mixture. By controlling the conditions of the reduction process, the oxides of copper and iron in the mixture are reduced to metallic copper and metallic iron. These two metals then aggregate with rare and precious metals such as gold and silver from the electronic waste to form a copper-iron precious metal alloy. Rare earth oxides are not reduced and remain in the slag layer. The copper-iron precious metal alloy particles are denser than the rare earth slag and sink rapidly to the bottom of the furnace. After settling and stratification, the copper-iron precious metal alloy melt and the rare earth slag are discharged separately from the metal outlet and slag outlet, respectively. This method achieves the simultaneous recovery of rare earth elements from NdFeB waste and copper, gold, and silver from electronic waste. The process is short, energy-efficient, and offers significant economic and environmental benefits.

This invention relates to a method for preparing copper-based friction materials from copper-containing electronic waste, belonging to the field of electronic waste resource utilization technology. The invention involves uniformly mixing copper-containing electronic waste with copper-containing solid waste to obtain a mixture. This mixture is added to a smelting pool and heated to melt. Oxygen-enriched gas is introduced for oxidative smelting to obtain an oxidized melt. A reducing agent is added to the oxidized melt, and a protective gas is introduced for stirring and heat preservation for reduction smelting. Copper-rich alloy and slag are separated by sedimentation. The copper-rich alloy is powdered to obtain copper alloy powder. The copper alloy powder and friction components are uniformly mixed and pressed into a billet. The billet is sintered to obtain the copper-based friction material. The coefficient of friction of the copper-based friction material is 0.25~0.60, and the wear rate is ≤2.5×10⁻⁶. ‑ 7 cm 3 / J, with a hardness of 40~80HB. This invention achieves the synergistic treatment of copper-containing electronic waste and copper-containing solid waste through high-temperature smelting, efficiently recovering valuable metals, and directly preparing copper-based friction materials from the copper-rich alloy produced by smelting.