MANUFACTURING PROCESSES

FLUXOGRAM OF CELLULOSE PRODUCTION

The process begins in the nursery with research and genetic improvement of the eucalyptus seedlings. From nursery the seedlings go to planting in forest horticulture.

1. HARVEST

1. HARVEST

After a cycle of 7 years the eucalyptus is cut, stripped and transported to the factory, an operation that takes place inside the plantations where the eucalyptus trees are cultivated. Hulls, leaves and branches stay on the ground to turn organic matter.

2. CAVAC PRODUCTION

2. CAVAC PRODUCTION

After this process, the logs are taken for washing, pruning at predetermined size and sieving. From there, the chips are in a circular fence (wind fence) and silos.

3. COOKING

3. COOKING

In cooking, the chips form a brown paste, also called unbleached pulp. This process, which is called Kraft, occurs at 150º C with addition of Sodium Sulfide, dissolving the lignin and releasing the cellulose as pulp of higher quality paper.

4. DEPURATION, SLIDING AND BLEEDING

4. DEPURATION, SLIDING AND BLEEDING

Purification consists of separating the impurities from the wood and pieces of chips that have not been cooked. Thereafter, lignin, a substance which binds cellulose cells, is removed. In bleaching, the cellulose is subjected to a chemical treatment with oxidizing agents. This operation is done in 3 stages until the desired brightness is reached.

5. DRYING

5. DRYING

On drying, the cellulose water is withdrawn until it reaches a satisfactory balance with the relative humidity of the environment.

6. PACKING

6. PACKING

After drying, the cellulose sheets are cut and organized into bales, making transportation easier.

7. TRANSPORT

7. TRANSPORT

After being stored, the pulp is sent from the private port of the company in Guaíba to the Public Port of Rio Grande through Lake Guaíba and Lagoa dos Patos. One of the differentials of CMPC Celulose Riograndense is to have a location close to BR 290 that facilitates the transportation of wood from the most varied regions of the State.

8. MARKETPLACE

8. MARKETPLACE

The pulp produced at the Guaíba plant is used for the entire external market.

POWER GENERATION

POWER GENERATION

100% of the energy required to produce pulp is generated by the mill itself. The company generates energy for its own use and sells a surplus capable of serving a city of 200 thousand inhabitants from waste from the pulp production process. These wastes are burned in a boiler and the steam produced makes the turbines work. Thus, we have steam and electric power to meet the needs of the factory.

WASTEWATER TREATMENT

The advanced Effluent Treatment System makes CMPC Celulose Riograndense one of the few factories in the world with this structure. The water for the pulp production process comes from Lake Guaíba. After its use, it goes through the primary, secondary and tertiary treatments to be returned to the lake again. CMPC Celulose Riograndense was a pioneer in the use of this technology, and today, among the more than one thousand pulp mills in the world, less than ten use this innovation, which guarantees an excellent quality to the effluent. The sludge generated in this plant undergoes a process of composting to be later sold to the market as organic fertilizer, replacing the use of black soil taken from plots and forests.

RECYCLING AND PRODUCTION OF ORGANIC FERTILIZERS

99.7% of the waste resulting from the pulp manufacturing process is recycled. Most solid waste generated by the industrial process is treated by the company Vida Produtos e Serviços in Ecological Development and later marketed as agricultural inputs.

CHEMICAL PLANTS AND CALCIUM CARBONATE PRODUCTION

Much of the chemicals used by CMPC Celulose Riograndense are produced internally. The surplus is sold to the market for the water treatment, cleaning products, plastics, rubbers and food industries.

PAPER

CMPC Celulose Riograndense has a paper production unit with the capacity to generate 60 thousand tons per year, which serves the national printing and writing market.

KNOW THE CMPC PRODUCTS

Cellulose is a polysaccharide (similar to sugar), being the main component of the cell wall of plant fibers.



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