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Method for determining slag type of molten pool smelting electronic waste and slag type

A technology for e-waste and molten pool smelting, which is applied to the improvement of process efficiency, the use of wave/particle radiation for material analysis, instruments, etc. Simple steps, maintain normal production, and produce clear slag

Active Publication Date: 2021-11-30
LANZHOU ENG & RES INST OF NONFERROUS METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the production practice of co-processing e-waste with molten pool smelting furnaces at home and abroad, the proportion of e-waste in the incoming raw materials is very low. limited

Method used

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  • Method for determining slag type of molten pool smelting electronic waste and slag type
  • Method for determining slag type of molten pool smelting electronic waste and slag type

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Embodiment

[0033] The invention provides a method for determining the slag type of electronic waste smelted in a melting pool, the method comprising the following steps:

[0034] (1) The raw materials come from various types of copper-containing electronic waste collected in the market. After crushing, mixing, and roasting at 650°C, the remaining residue components are analyzed by chemical quantitative analysis and X-ray fluorescence spectroscopy, as shown in Table 1.

[0035] Table 1 The main components of the roasting residue (unit: g / t)

[0036]

[0037] It can be seen from Table 1 that Al in the waste circuit board roasting residue 2 o 3 Content > 15%, Al 2 o 3 Amphoteric oxide, Al 2 o 3 The presence of Al has a great influence on the viscosity of slag, and Al 2 o 3 The higher the content, the higher the slag melting point and the greater the viscosity. Combined with the phase diagram theory, consider that at 1300 °C, by increasing the solvent, balancing the composition of...

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Abstract

The invention relates to a method for determining the slag type of molten pool smelting electronic waste. The method comprises the following steps: (1) determining the content of oxide components forming a slag system in the electronic waste; (2) searching low melting point regions in silicon-calcium-iron and silicon-calcium-aluminum ternary phase diagrams; (3) searching corresponding additives forming the low-melting-point regions of the silicon-calcium-iron and silicon-calcium-aluminum ternary phase diagrams; (4) determining the content of each additive corresponding to the unit electronic waste; (5) carrying out a molten pool smelting test according to the determined content of each additive corresponding to the unit electronic waste, and verifying whether the slag type is an ideal slag type or not; (6) if the slag type is not the ideal slag type, returning to the step (3) and repeating the steps until the ideal slag type is found; and (7) drawing a silicon-calcium-iron or silicon-calcium-aluminum quaternary slag type phase diagram according to the determined ideal slag type. The method is simple in step, high in operability and also suitable for determining the slag type of other novel smelting processes without reference data.

Description

technical field [0001] The invention relates to the technical field of resource utilization of nonferrous metals, in particular to a method for determining the slag type of electronic waste smelted in a melting pool and the slag type. Background technique [0002] With the rapid development of the economy, the speed of updating and eliminating various electronic and electrical products is accelerating year by year, and the resulting electronic waste is also increasing year by year. The main components of electronic waste are synthetic resin, rubber, copper, binder, etc. Electronic waste is stored directly without treatment, firstly it needs to occupy a large amount of land resources; secondly, the polymer materials contained in it are difficult to degrade, causing serious pollution to the ecological environment. With the advancement of technology and increasingly stringent environmental protection requirements, traditional blast furnace incineration and wet acid leaching an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04G01N23/223G01N33/00G01N33/202
CPCC22B7/04C22B7/001G01N23/223G01N33/00G01N33/202Y02P10/20
Inventor 郭键柄陈正丁志广卢超
Owner LANZHOU ENG & RES INST OF NONFERROUS METALLURGY
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