Filler Recovery Process to Recover Raw Material in the Paper Mill Mineral Loaded Rejects ppt

Technology Fact Sheet for Cleaner Production in Pulp and Paper IndustryNetwork for Industrial School of Environment, Resources and Development Fact Sheet No: 1 Title of Technology: Fille

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Technology Fact Sheet for Cleaner Production in Pulp and Paper Industry

Network for Industrial School of Environment, Resources and Development

Fact Sheet No: 1 Title of Technology: Filler Recovery Process to Recover Raw Material in the

Paper Mill Mineral Loaded Rejects

Technology Applied in:

Raw Material Preparation Stage Pulping Stage

Recycled Fiber Technology Stock Preparation Stage

Paper Making Stage 9 Utilities/ Effluent Treatment

Technology Implementation Results in Reduction of:

Process/Technology Description:

The FilRec™ process recovers the useful filler, which is the raw material in the paper makingstage and alters them to the paper furnish quality The process starts with the fractionationstage using pressure screen or bow screens, which separates out the coarse rejects (stifffibers, shives and other coarse solids like dirt) and the fine fractions, containing minerals andwater The fine fractions from the fractionation stage are sent to the filler recovery stage,which is a special type centrifugal cleaner separating out the mineral solids based on theparticle size Fine fillers with water are sent back to the papermaking stage and the coarsesolids are sent to the mineral dispersion stage after concentrating them to 30 – 50% solids Inthe mineral dispersion stage, the coarse minerals are broken down with the help of a heavy-duty dispersion machine In this continuously circulated dispersion loop comprising of the fillerrecovery and mineral dispersion stage, fine filler is recovered The coarse fraction from thefractionation stage is classified in the final rejects stage The reusable fibers and fine fillersare returned to the paper machine The final rejects are sent for final disposal

Benefits and Investments Required:

• Solid waste (kg/day)

• Air emissions (Flow/SOx,NOx)

Reduction in solids in the effluent

Equipment /Process Modifications

This is an add-on system to the paper mills with requirements of minor rerouting of pipingnetwork

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Costing Details

Savings : US $ per year

Power:

Chemicals:

Treatment costs:

Manpower:

Recovered filler cost

Name Enso Fine Papers Oy Name Ahlstrom Machinery

Block Diagram of Adopted CP Technology:

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Fact Sheet No: 2 Title of Technology: Wet Washing of Raw Material for Chloride Removal

Raw Material Preparation Stage 9 Pulping Stage

Paper Making Stage Utilities/ Effluent Treatment

Energy Consumption Pollution Volume/ Load 9 Others

The presence of chlorides affects any combustion technology and affects combustion influidized bed recovery systems However, the chlorides present in non wood raw materialsare washable and can be reduced to an acceptable level by means of suitably designedwashing systems consisting of equipment for submergence, washing draining and passingthrough a screw press to an acceptable uniform level of moisture The washing also helpsimprove the pulp characteristics

Reduction in Chemicals Requirement

Reduction in Pollution Generation

• Water (BOD/COD/volume/toxicity)

Reduction in water pollution load

The implementation of this technology requires installation of paddle washers, rotary drumdrain and screw press

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Costing Details

Power:

Chemicals:

Treatment costs:

Manpower:

Name Shreyans Industries Limited Name Agro Pulping Machinery Pvt

Address Krishnan Complex, 4th Floor,

39-B, Chevalier Sivaji GanesanRoad, T.Nagar,

Chennai – 600 017India

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Fact Sheet No: 3 Title of Technology: Hydrodynamic Separator for Raw Material Recovery

This technology is applied in the papermaking section to recover raw material and reducepollution loads A new design of storage tank, “the hydrodynamic separator”, is installedabove the pulper on the paper making machines, which replaces the conventional white watertanks White water is pumped directly from the paper machine wire pit and press section tothe hydrodynamic separator The white water enters the separator at an angle designed toinduce a cyclonic flow, which holds the solids in suspension towards the inner shell of thevessel Clear water separates and flows inwards below the annular baffle, overflowing thecentral circular weir when the separator is full The solids are concentrated at the bottom ofthe separator, ready for the next pulper recharge The conical base of the hydrodynamicseparator is shaped to release solids, reducing the number of blockages and therefore cuttingmaintenance requirements

Solids removal by 42 to 96.5 %

In case of mills having white water tanks, retrofitting of the existing tanks and piping networkwill be required In case of mills not having white water tanks, installation of the entire system

is required

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Costing Details

Operating Costs US $ per year

Name Arjo Wiggins Fine Papers Ltd Name Indigenous Development

Address Stowford Mill,

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Fact Sheet No: 4 Title of Technology: Dry and Wet Cleaning of Straw

Raw Material Preparation Stage 9 Pulping Stage

Optimum utilization of raw material

Reduction in Chemicals Requirement Savings in chemicals by 2%

Reduction in water pollution

For implementation of this technology, the feeding mouth of the four roller feeder needs to bereduced and the hoppers also need to be modified An additional screw conveyor to transferthe raw material is required and the dregs remover needs to be replaced by dehydroextractor

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Costing Details

Capital Cost: US $

Name Western Machinery Supplier

Address Zhenjiang Light Ind Machinery

PlantJiangsu Province

PR China

Telephone Telefax

Widely used in China For specific application,

please contact equipment supplier

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Fact Sheet No: 5 Title of Technology: Application of Four Stage Counter-Current Vacuum Drum

Washers System for Extraction of Black Liquor

to keep a certain suction of the vacuum washers, lower pulp level, low rotation revolving ofdrum and high thickness black liquor in operation are adopted The operation requires one-third wash drum to be immersed in pulp in order to keep the operation at low pulp level.According to the diversities of raw material and their filterability, different thickness of feedpulp are chosen to raise the dryness of the pulp after washing In the equipment operation, it

is important to avoid the black liquor flow back to the vacuum washing system to influence thesteady state of suction After going through the pulp washing system, the black liquorextraction ratio reaches 80 to 85 % level The higher concentration of the black liquor benefitsthe alkali recovery

Reduction in water consumption by 80%

This technology requires addition of four stage countercurrent vacuum washers system as anadd-on equipment with minor modifications in the existing system

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Costing Details

Name Zhejiang Minfeng Group

2nd VACUUM WASHER

3rd VACUUM WASHER

4th VACUUM WASHER

FIBRE TRAP

BLACK

LIQUOR

BLACK LIQUIOR

1# BLACK LIQUIOR STORAGE TANK

BLACK LIQUIOR

CRUDE PULP

ALKALI

RECOVERY

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Fact Sheet No: 6 Title of Technology: Solid State Chemical Recovery

There are a lot of wastes, both solid and liquid, which can be treated economically inbiological treatment by converting the waste first into a semi solid by mixing them with readilyavailable biomass and then subjecting the mixture to further biological and chemicaltreatment Strong wastewater like black liquor is extracted using special presses, and mixedwith easily available biomass and put into a solid state fermenter known as “Tuner Reactor”.The mass dries up radially through thermofilic bio-fermentation and is then led to provideheat Extra heat is available for other uses The ash is put through smelt dissolving andfurther passed through recovery section for chemical recovery

Reduction in steam consumption

No secondary effluent streams

This technology implementation requires changing of black liquor washing system New

equipment for solid state fermentation, pyrolysis and causticization need to be installed

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Costing Details

Name Innovative Steels Pvt

Limited

Name Dewan Kraft Systems Pvt Ltd

Address B-41, Sector 57, Noida

Uttar PradeshIndia

Address No-127, Greater Kailash 1

New Delhi 110 048India

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Technology Fact Sheet for Cleaner

Production in Pulp and Paper Industry

Fact Sheet No: 7 Title of Technology: Twin Wire Filter Press

Recycled Fiber Technology 9 Stock Preparation Stage

Energy Consumption 9 Pollution Volume/ Load 9 Others

This process involves squeezing of pulp, sludges and biomass to extract water held statially, thus making them thicker This technology finds application at all places where pulp,sludges and biomass need to be treated as in case of deinking plants, effluent treatmentplants and dewatering in the pulp mills This process is very useful in thickening of dilutesuspensions, thickening of pulp or any other dewatering requirements The dilute suspension

inter-of sludges is introduced through a headbox between a sandwich inter-of two moving filter cloths(wires) The wires move through a number of special rollers in a number of “S” formations tosqueeze out inter-statial water by gradually increasing shear forces Hydraulic or pneumaticpresses are introduced as per the application demand

Avoids air pollution

Any existing system needs to be replaced by this equipment The equipment requiresfoundations and electrical connections

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Costing Details

Operating costs US $ per year

Power:

Chemicals:

Treatment costs:

Manpower:

Name UP Straw and Agro Pulp Mill Ltd Name Dewan Kraft Systems Pvt Ltd

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Fact Sheet No: 8 Title of Technology: Sealed Water Recovery

Paper Making Stage 9 Utilities/ Effluent Treatment 9

Energy Consumption 9 Pollution Volume/ Load 9 Others

In the pulp and paper industry, water is used in different application areas like, process,cooling, equipment jacketing etc The water when used in a single pass system is wasted,thus increasing the water requirements in the plant and increasing the requirements ofwastewater treatment By making changes in the water loops and piping network, the sealedwater can be used in the system again Since the water, which is used in the equipmentsealing needs to be clear of any impurities, such recovery system would require installation offilters to purify water The pressure requirements of the sealed water units and the drop in thepipeline pressure needs to be matched in the system design

The existing piping network needs to be modified for the re-routing of the water flow.Additional equipment like small water tanks, filters etc need to be installed

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Costing Details

Power:

Chemicals:

Treatment costs:

Manpower:

Name Thai Kraft Paper Industry Co Ltd Name Indigenous DevelopmentAddress 99 Moo 6, Saeng Xuto Road,

Storage Tank

Main Filter

RecoveryWater

To Seal Pump WP#5

PIC

Booster Pump (Standby)

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Fact Sheet No: 9 Title of Technology: Fluidized Bed Recovery System for Sodium Carbonate

Pellets

of the black liquor burns and the inorganic salts form sodium carbonate pellets This is a lowcost technology, which is within the reach of agro-based paper mills and also a lowtemperature system capable of operating with higher silica black liquors The particulateemission is very low (150mg/m3) The mills adopting this technology have an option of sellingsoda ash as a by-product The system has an advantage of non-smelt residues, since the bedmedia is a resourceful by-product The process can be operated as a clean process, with theaddition of appropriate air pollution control equipment

Add-on technology to the existing operating plants

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Costing Details

Power:

Chemicals:

Treatment costs:

Manpower:

Name Shreyans Industries Limited Name Agro Pulping Machinery Pvt

Ltd

Address Ahmedgarh, Dist Sangru

Panjab

India

Address Krishnan Complex, 4th Floor

39-B, Chevaliar Sivaji GanesanRoad, T Nagar

Chennai 600 017India

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Fact Sheet No: 10 Title of Technology: Dust Removal System in the Paper Cutting Operation

This technology finds application in the paper cutting operation, where a lot of dust isproduced affecting the work environment This technology uses the controlled plant air tosuppress the small paper particles, which escape to the plant atmosphere The air streamsbuild shield around the machine where the cutting operation takes place This process notonly reduces the air pollution in the plant room, but also improves the working conditions inthe plant, as per the norms stipulated by the local authorities

• Air emissions (Flow/SOx,NOx) Reduction in particulates in the plant room.

The implementation of this technology requires installation of dust control equipment like airducts, solids collection system etc

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Costing Details

Name Valmet Machinery

Address 9th Floor, Home Place Building

Sukhumvit Soi 55Bangkok 10110Thailand

Tiêu đề	Filler Recovery Process to Recover Raw Material in the Paper Mill Mineral Loaded Rejects
Trường học	Asian Institute of Technology
Chuyên ngành	School of Environment, Resources and Development
Thể loại	Fact Sheet
Thành phố	Bangkok

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Số trang	40
Dung lượng	1,06 MB