Copper-containing sludge granulating and pre-drying equipment and process method

Abstract

The invention discloses copper-containing sludge granulating and pre-drying equipment and a process method. The equipment comprises an elevator, a stabilizing bin, a front stock bin, a pre-watering stirrer, a rear stock bin, a granulator and the like, wherein an integrated stock bin weighing device is arranged on the front stock bin, and a pneumatic valve is arranged at the bottom of the front stock bin; the pre-watering stirrer is capable of realizing stirring and scattering, an atomizing nozzle is arranged above the interior of the pre-watering stirrer and connected with a water supply device so as to realize accurate water distribution, and an upper level gage and a lower level gage are arranged on the rear stock bin; and materials are conveyed among the rear stock bin, the granulator and a drying and screening device through a belt conveyor. The method disclosed by the invention comprises the following steps: accurately distributing water for the mixed powder, fully stirring the materials in a three-dimensional stirring manner, and forming waterborne and uniform wet materials within 3 minutes. Pellets with consistent particles can be prepared, the stacking porosity is improved during sintering, the phenomenon that the pellets are burst due to non-uniform internal and external heating is greatly reduced, the phenomenon of non-uniform kiln section ventilation is greatly reduced, and heat wasted due to evaporation of the moisture can be reduced by 300-400 KJ/kg.

Description

technical field [0001] The invention relates to equipment and a process method for granulating and pre-drying copper-containing sludge, and belongs to the technical field of reuse of hazardous waste resources. Background technique [0002] Copper-containing sludge belongs to the HW17 category in the National Hazardous Waste List. It mainly comes from the sludge generated in the wastewater treatment process of metal surface treatment, heat treatment processing, electronic component manufacturing, electroplating and basic chemical raw material manufacturing. These heavy metal-containing sludge Mud has the characteristics of easy accumulation, instability, and easy loss. If it is not handled properly, it will cause serious environmental pollution. [0003] Most of the sludge reuse methods are brick making, ceramsite making, etc., which have the advantages of high efficiency, economy, and low operating costs. It can improve storage and transportation conditions, realize the harm...

AI Technical Summary

Problems solved by technology

[0004] In the actual production process, the balls made by the granulator are often inconsistent in shape due to uneven mixing of materials. During sintering, the balls are prone to burst due to uneven heating inside and outside, making it difficult to produce high-quality ceramsite.

In addition, before disposal, copper-containing sludge is usually dried in the shade in order to facilitate stacking and transportation. The surface of the sludge is partially dried, and the interior still contains 50-70% of water. The existing production process usually uses the sludge to Dehydration and drying, or sufficient water distribution without considering the water contained in the sludge, will easily lead to complex production processes and high energy consumption for sintering.

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