Sappi To Convert Minnesota Pulp Mill For Chemical Cellulose Production
Cloquet Mill, established in 1898, underwent a major upgrade in the 1990s. According to Mike Schultz, project director in charge of the conversion, it is the most modern pulp mill in North America and produces pulp using batch cooking technology, which is suited for making chemical cellulose, rather than continuous cooking, another pulp-making technology that is not suitable for making chemical cellulose. "We will still have the ability to make kraft pulp if we choose to, but the intent will be to begin producing chemical cellulose as quickly as we can and produce as much as the market will support," he said.
The pulp will be shipped primarily to China, Indonesia and India, where it will be processed into rayon fiber for various textile applications. Schultz said there currently is not a market for the pulp in the United States, but if domestic opportunities should open up, the company will be ready to supply that market as well.
Sappi's Southern Africa division currently is producing chemical cellulose at its Saiccor Mill in South Africa. With an annual production capacity of 850,000 metric tons, that mill is the largest producer of chemical cellulose worldwide, according to the company. Conversion of a second mill in South Africa is underway, and once that conversion, along with the Cloquet Mill conversion, is completed, the company will be able to produce more than 1.3 million metric tons of chemical cellulose per year.
The chemicals used in the processing of the pulp will be recovered and reused, Schultz noted. In addition, byproducts of the process can be used in other products, for example, pickling salt and sweetener for gum, among other products.