Automatic Sludge(Coal Slime ) Industrial Drying Equipment For Electroplating Sludge

Equipment Introduction :

With the continuous enhance of people's awareness of environmental protection, and sludge drying

technology is also in the rapid development, the constant innovation and improvement also happens in

the aspects of energy saving, safety, reliability, sustainability. Our automatic sludge industrial drying

equipment can reduce the water content of dewatered sludge from 80 + 10% to 20 + 10%. The

advantages of our system are as follows: a. The weight of the dried sludge can be reduced to 1/4 weight

of wet material before drying, which greatly reduces the enterprise's environmental and economic

pressure; b. The air inlet temperature of the dryer is 600-800, and it can be used for sterilization,

deodorant, etc.; c. The dried products can be used as feedstuff, fertilizer, fuel, building materials, and

raw materials for extracting heavy metals, to realize waste utilization; d. PLC automatic control system

can be adopted in the entire system, which contains advanced testing equipment, thermometer,

temperature control device, fault alarm and automatic shutdown protection etc.

The dewatered sludge will be transported to feeding head of the dryer through the screw conveyor after

scattering, and then it will be sent into the inside of the dryer through the unpowered spiral sealing

feeder (the patent technology of our company), and going through several following working areas after

getting into the dryer:

1. Material leading-in area

The sludge will come into contact with the high temperature negative pressure air after getting into this

area and plenty of water will be rapidly evaporated, and the sludge can’t be formed into sticky stuff under

the stirring of large guide angle lifting plate.

2. Cleaning area

The material curtain will be formed while the sludge is lifted up at this area, and it will cause the material

stick on the cylinder wall while it’s falling down, and the cleaning device is installed at this area (Lifting

style stirring plate, X type second time stirring plate, impacting chain, impacting plate), the sludge can

be quickly removed from the cylinder wall by the cleaning device, and the cleaning device can also

crush the materials which are bonded together, so as to increase the heat exchange area, increase th

time of heat exchange, avoid the generation of wind tunnel phenomenon, improve the drying rate;

3. Inclined lifting plate area

This area is the low temperature drying area, the slime of this area is at the low moisture and loose

state, and there is no adhesion phenomenon at this area, the finished products reach the moisture

requirements after the heat exchange, and then enter the final discharge area;

4. Discharging area

There aren’t stirring plates at this area of the dryer cylinder, and the material will be rolling to the

discharging port.

The sludge gradually becomes loose after drying, and discharged from the discharging end, and then

sent to the designated position by the conveying device, and the fine dust drawn out along with the tail

gas is collected by the dust collector.

Hot air enters into the drying machine from the feeding end, and the temperature is gradually reduced at

the same time of material convection heat transfer, and the water steam taken out under the suction of

induced draft fan, and then emitted into the air after processing.

Application after drying :

1. Heavy metal recycling

During the wastewater treatment process of the smelting plant, the circuit board printing factory,

electroplating factories and other enterprises, and the sludge produced contains plenty of heavy metals

(copper, nickel, gold, silver, etc.). There will be a major pollution if these metal elements are drained, but

considerable economic benefits can be reached after extraction and refining.

2. Incineration power generation

The approximate calorific value of the dried sludge is from 1300 to 1500 calories, three tons of dry

sludge can be equivalent to one ton of 4500 kcal coal, which can be burned in the furnace mixed with

coal.

3. Building material

Concrete aggregate, cement admixture and the production of pavement encaustic brick, permeable

brick, fiber board, to make bricks by adding into the clay, its strength is equivalent with common red

bricks, and it’s with a certain amount of heat, in process of fired brick, the spontaneous combustion can

be reached to increase the heat.

4. Organic fertilizer

The dried sludge will ferment into high quality organic fertilizer after adding the cow manure, with good

fertilizer efficiency, safe and convenient use, and disease resistance and to promote growth, which can

also fertilize soil.

5. Agricultural usage

There is high content of N, P and K in the sludge, and it’s much higher than that of pig manure, cattle

manure and chicken manure, and there is rich organic compound content. It can be used as agricultural

fertilizer after the processing of automatic sludge industrial drying equipment, and can make quality soil

through re-proportioning landfill.