A kind of copper-containing sludge sintering method

Abstract

The invention discloses a copper-containing sludge sintering method, comprising: igniting a primer layer and moving the primer layer from a first end to a second end; during the movement of the primer layer, at least Two feeding points, the material to be sintered is added in layers and layers; and the oxygen-containing gas flow is fed from the bottom of the primer layer to realize combustion support; wherein, the material to be sintered is added to the bottom fire layer at the first charging point near the first end After that, each feeding point is sequentially fed to the previous feeding layer to form a multi-layer feeding layer; the material to be sintered is a mixture of copper-containing sludge and fuel, or a pellet made of the mixture; the first feeding point is charged or before each subsequent feeding point, the primer layer or the previous feeding layer has been fully ignited; The temperature of the upper part of the layer is determined; the oxygen-containing gas stream is formed by mixing a part of the flue gas passing through the material layer with the new oxygen-containing gas stream.

Description

technical field [0001] The invention relates to the technical field of copper-containing sludge resource utilization, in particular to a copper-containing sludge sintering method. Background technique [0002] Copper-containing sludge is a sludge mainly containing copper hydroxide, sulfide and other precipitates, which is mostly produced in the copper-containing wastewater treatment process of metal surface treatment industry, printed circuit board industry, electroplating industry and wire and cable industry. [0003] Copper-containing sludge often contains a variety of heavy metals, the composition is complex and the moisture content is as high as 60% to 70%, and the hydroxides of heavy metals such as copper, nickel, zinc, and chromium are in an unstable state; Under the action of rainwater leaching, heavy metals are very likely to dissolve again, pollute the soil or groundwater, and cause environmental and ecological hazards. Therefore, this kind of sludge has been inclu...

AI Technical Summary

Problems solved by technology

[0006] 1. The water content of copper-containing sludge is as high as 60% to 70%, and it is muddy and very sticky; the existing copper-containing sludge sintering process is a one-time fabric, with thick material layers and poor air permeability. The combustion process is very slow, which leads to problems such as large fuel consumption, insufficient combustion, long sintering time, high energy consumption, and low output.

[0007] 2. The source of copper-containing sludge is very wide, and the production process is diverse. The moisture content of copper-containing sludge from different manufacturers varies greatly, and the difficulty of dehydration also varies greatly; the thickness of the material layer of the existing copper-containing sludge sintering process is fixed, During the sintering process, the thickness of the material layer in the furnace cannot be adjusted in real time according to the sludge entering the furnace and the sintering conditions in the furnace, and the process flexibility is poor; the change in the moisture content of the sludge makes the operation of the sintering process unstable, the quality of the sintered product is unstable, and sintered lumps often appear Raw material or overburning phenomenon

[0008] 3. The existing copper-containing sludge sintering process is one-time distribution, and the material is often formed into a huge whole. When discharging, it needs to use a large crusher to break it into small pieces; this crushing process will produce a lot of powder. The sintering rate is reduced, and the powder needs to be returned to the furnace for sintering again, which occupies the effective production capacity and increases energy consumption

[0009] 4. The existing copper-containing sludge sintering process uses air to support combustion, and the air is directly discharged after passing through the sintering material layer. This method has a low oxygen utilization rate, and the discharged gas takes away a lot of heat, resulting in large heat loss and high energy consumption.

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