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Technical introduction

hazadous waste disposal in surface treatment

Copper containing sludge mainly comes from the surface waste generated in the rust removal, washing, coating stripping and other processes of the electroplating industry. It has the characteristics of large production, high water content, high viscosity, organic waste and low metal content. It is a kind of hazardous waste that needs to be solved urgently at present.
Our company's comprehensive recovery technology of copper containing sludge with the main process of low-temperature drying - re side blowing electric furnace - quench tower - combination of dry and wet desulfurization - combination of high and low-temperature out of stock is in a high position in the country. It is an excellent joint supplier of overall solutions in China. It has been applied in many copper containing sludge treatment enterprises in the country and has been widely praised.
Our company can provide users with technical consultation, factory design, equipment and installation services for the whole process of waste lead-acid battery recycling according to the needs of users.
Batching process scheme - main equipment of intelligent batching

Since the water content of copper containing sludge reaches about 70% and there are organic components, in order to eliminate the generation of dioxin in the drying process, make full use of the steam produced by the side blowing furnace and reduce the energy consumption, the steam indirect low-temperature drying process is adopted for sludge drying.

The wet sludge is sent to the slitter by the scraper conveyor, and the formed sludge enters the mesh belt low-temperature steam dryer of polyurethane cushion for drying. The end-point moisture and drying capacity of sludge can be effectively controlled by adjusting the running speed of the mesh belt conveyor.

The sludge low-temperature steam dryer uses hot air to dry the sludge, the saturated wet air generated after drying is cooled by cold water, and the dry air after cooling and dehydration exchanges heat with hot water to dry the wet sludge circularly. Heat exchange model of sludge low-temperature steam drying: firstly, steam and water are used for heat exchange, the water temperature is raised to 85 ℃ ~ 90 ℃, and then hot water and air are used for heat exchange, the air temperature is raised to 75 ℃ ~ 80 ℃, and the hot air is used to dry the sludge from bottom to top. The saturated wet air generated in the drying process is cooled, condensed and dehydrated by heat exchanger (water cooling), The hot water after heat exchange with hot air circulates through the heat exchanger (heated by steam), and then repeats the above drying process after heat exchange.

Smelting process scheme - re oxygen enriched side blowing electric furnace

Re type oxygen enriched side blowing electric furnace is an oxygen enriched side blowing furnace designed by Hunan Ruiyi Zihuan Technology Co., Ltd. to deal with copper containing sludge and heavy metal containing hazardous waste. The furnace has applied for invention patent.

Its main features are:

1. The large front bed design greatly improves the melt precipitation area and precipitation time, so as to improve the metal recovery.

2. Shallow hearth and inclined bottom plate design are adopted to eliminate the freezing of hearth caused by temperature reduction.

3. Accurately control the height from the air nozzle to the top of the material layer to reduce the thickness of the slag layer on the air nozzle.

4. The side blowing furnace is integrated with the front bed, and the melt continuously flows into the front bed and electric heating front bed

Continuous slag discharge is adopted to keep the material layer and slag layer in the furnace stable.

5. The thickened hearth lining can effectively prevent heat loss from causing cold furnace.

Flue gas treatment process scheme

On the vertical flue of oxygen enriched side blowing furnace, SNCR denitration nozzle is set in front of the inlet of waste heat boiler. The flue gas at the outlet of waste heat boiler enters the quench tower, and the temperature is reduced from 550 ℃ to 200 ℃ within 2S. Activated carbon injection and hydrated lime injection are added to the outlet pipeline of quench tower, and then enter the bag dust collection. The flue gas at the outlet of bag dust collection enters the wet desulfurization, electric demist and SCR denitration system in turn.

In this flue gas treatment process, dioxin, sulfur dioxide and nitrogen oxides are treated in two stages, and the smoke and dust are collected in three ways. Finally, the discharged flue gas can meet the national environmental protection requirements and be discharged below the national environmental protection standards.


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