Method for recycling and handling low lead zinic waste residue

Abstract

The invention discloses a method for recycling and handling low lead zinic waste residue, through which the content of kiln slag carbon of low lead zinic waste residue can be reduced below 1% to meet requirement of addition of cement and realize zero waste residue discharge with a lower cost. The method for recycling and handling low lead zinic waste residue comprises the following steps of: recycling the low lead zinic waste residue by a rotary kiln fuming process and arranging a gas-solid separation unit on a smoke channel between a settling chamber and a cooler in the rotary kiln fuming process. The gas-solid separation unit (separating power: cutting particle size: 1-80 microns) can separate the waste residue and coal ash so as to extract products with higher quality from the smoke finally.

Description

technical field [0001] The present invention relates to a recycling and processing method of waste residue, more specifically to a recycling and processing method of low-lead-zinc-containing waste residue, which is mainly applicable to lead-zinc leaching waste residue in wet smelting, zinc-containing dust in steelmaking plants, etc. Zero-waste discharge rotary kiln fuming treatment process for refining zinc oxide and lead oxide from low lead-containing zinc waste residue. Background technique [0002] At home and abroad, a large amount of low-lead-zinc waste residues are produced in lead-zinc extraction and steelmaking, such as zinc hydrometallurgy leaching waste residue, lead blast furnace slag, zinc-containing dust and low-zinc oxide ore in steelmaking plants, mining waste rocks, etc. The waste residue containing lead and zinc reaches tens of millions of tons every year. Only a small part of them is processed, and most of them can only be landfilled and piled up, pollutin...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that the output is low, the waste slag and waste gas cannot be harmless, and the carbon content in the waste slag-kiln slag produced in the production reaches 3-10%, which cannot meet the requirements of cement mixture materials, because most of the waste slag used as raw materials contains Sulfur, emitted flue gas SO 2 The content does not meet the requirements of environmental protection

In addition, the heat of waste residue at 1200°C is not recovered at all, and the heat energy utilization rate of the system is very low, especially because coke is produced with coal, and the price is high, so the treatment cost is high, making the waste residue treatment process often in a position of loss

In the further improvement method, in order to reduce the amount of coke, some granular coal is used instead of coke, which can reduce part of the production cost. Oil burners are also used at the kiln head. Although the output can be increased, the cost is too high. However, if the kiln head uses pulverized coal burners , in the existing process, the ash particles produced after pulverized coal combustion are fine, and will be mixed into the final product through the settling chamber, which will greatly reduce the quality of the product

In addition, the Waeltz method cannot use powder, but must use pellets. If the raw materials do not meet the particle size requirements, the particles are too small, and a large amount will be mixed into the finished product, resulting in a decrease in product quality. If powder granulation technology is used to solve the problem of powder, It consumes a lot of energy and has high processing costs, making it difficult to make a profit

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