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Operational Overview

Meadow Lake Mechanical Pulp produces Bleached Chemi-Thermo Mechanical Pulp (BCTMP) which can be used in a variety of products including printing and writing paper, coated paper, and board grades. Meadow Lake produces a variety of grades dependant on the end use. BCTMP is sought after because of its excellent optical and bulk properties. Meadow Lake has hardwood aspen, softwood spruce, and pine fibre available for producing a wide range of products. The Meadow Lake Pulp Mill is the first successful zero-liquid effluent mill in the world. A step-by-step overview of the process is described below:

Woodroom

The Woodroom receives 900,000 cubic meters of logs per year. That equates to approximately 21,000 truck loads of logs.

A 30 tonne portal crane handles the tree length logs by feeding them onto the log deck or storing them. The crane has the capacity to store 200,000 cubic meters of logs at a time. The log decks sort and feed the logs into two ring debarkers and two disc chippers. The Woodroom processes 3,000 cubic meters or 70 truckloads of logs per day. The chips are fed into storage bins, where the pulp mill then reclaims the chips to process them into pulp.


Main Mill

Once chips have been reclaimed they are separated into two production lines, and move through several stages of steaming, storage, chemical treatment, and mechanical de structuring in preparation for refining.

Refining is the important stage that changes wood chips into pulp, and where the properties of freeness and debris are controlled. Most of the remainder of the Main Mill process is dedicated to bleaching, as well as cleaning and washing impurities out of the pulp. Our Mill uses hydrogen peroxide as one of its main bleaching chemicals.

The final stage involves drying, weighing, baling, and packaging the final product. It is then stored in the Warehouse or loaded onto trucks.

From the Mill Site, a combination of trucking and rail is used to move the pulp to Vancouver. From there, it is loaded to either container or break bulk ocean freighters and exported.

MLMP is capable of producing 360,000 tonnes per year.


Steam & Recovery

The S&R department's role is to supply steam and air for internal customers throughout the Mill Site and to process all liquid effluent discharge into reusable water and chemical recovery. Hence the term "Zero-Effluent Liquid Discharge."

All liquid effluent (5500 l/m - 6000 l/m) is directed to a Feed Chest or Settling Pond. From there it is clarified, excess fiber is pressed (to remove any liquid) then recompressed and burned in our Incinerator. The liquid is run through a set of Falling Film Evaporators and concentrated up to 30% solids. This liquid is further concentrated via steam assist to the 68% range and used as fuel in our Recovery Boiler.

The waste smelt that flows from the Recovery Boiler is put through a Smelt Dissolving process to produce a substance called Green Liquor. The Green Liquor is filtered, oxidized and re-introduced into the Pulping Process as caustic. This is a continuous cycle and no effluent enters our lakes, rivers, or streams.


Technical

Process testing is conducted in the Lab. The results provide operators with information on Process Operations which helps to determine the required chemical addrates to ensure that the Mill is producing the required product grade. These tests provide information on Mill processes and equipment which helps to optimize operations, and troubleshoot throughout the Mill.

The Quality Laboratory is where pulp is tested to ensure that it meets the customer specifications. Quality testing consists of tests to determine the pulps' physical and optical properties, such as: Canadian Standard Freeness, Brightness, Breaking Length, Bulk, Debris, and Chemical Oxygen Demand. An online instrument called the "PulpExpert" is used for quality testing at several key points in the process to ensure final product quality. This piece of equipment is verified daily by conducting manual physical and optical testing in the Quality Lab.

The Analytical Laboratory is responsible for analyzing samples throughout the Mill. These samples can vary from scale found in a pipe or vessel, to an effluent sample from a process stream or a process chemical. These analyses usually include some determination of the organic to inorganic ratio, and/or elemental analysis. The Analytical Lab will also conduct laboratory trials to help determine the effect of a process change before applying the change to the Mill process.


For detailed product information please contact:

info@meadowlakepulp.com

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Telephone: 306.236.2444 Fax: 306.236.4880 Email: info@meadowlakepulp.com

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