Method of recovering noil fibres and soluble wood material from waste water
阅读：147发布：2022-01-11
专利汇可以提供Method of recovering noil fibres and soluble wood material from waste water专利检索，专利查询，专利分析的服务。并且Noil fibres and wood material which has dissolved or is becoming dissolved in white water from wood processing industries are recovered and used as additional raw material, and resulting clarified water is recycled for use as fabrication water. The pH of water is controlled during the recovery process and the material to be recovered is caused to agglomerate by the addition of agents whose presence in the final product is beneficial. A polyelectrolyte or the like can be added to enhance flock formation.，下面是Method of recovering noil fibres and soluble wood material from waste water专利的具体信息内容。
1. A METHOD OF RECOVERING NOIL FIBRES AND SOLUBLE WOOD MATERIAL IN WHITE WATER FROM A MANUFACTURING PROCESS INVOLVING THE FORMATION OF A PULP WEB BY SEPARATING FLOCKED OUT MATERIAL FROM WATER TO PRODUCE CLEARED WATER AND RETURNING THE MATERIAL FLOCKED OUT TO THE PULP WEB FOR RETENTION AS A BENEFICIAL CONSTITUENT OF THE MANUFACTURED PRODUCT, COMPRISING: ADDING A SUFFICIENT QUANTITY OF AN ALKALINE SUBSTANCE TO WHITE WATER TO PREVENT PREMATURE COAGULATING OF SUSPENDED MATERIAL; THEN ADDING AS A COAGULATING AGENT A MATERIAL WHOSE PRESENCE IN THE PULP WEB FORMED IS BENEFICIAL SELECTED FROM THE GROUP CONSISTING OF PHENOL-FORMALDEHYDE RESIN, CARBOXYMETHYLCELLULOSE, UREA RESIN, MELAMINE, LINSEED OIL EMULSION; POLYVINYLCHLORIDE-LATEX EMULSION AND ACRYLIC LATEX EMULSION; THROUGHLY MIXING SAID WHITE WATER WITH SAID COAGULATING AGENT TO OBTAIN A SUBSTANTIALLY HOMOGENEOUS SUSPENSION; AFTER SAID MIXING, ADDING A SUFFICIENT QUANTITY OF AN ACIDIC SUBSTANCE TO THE SUSPENSION TO LOWER THE PH TO FORM FLOCKS INCORPORATING SAID COAGULATING AGENT, NOIL FIBRES AND SOLUBLE WOOD MATERIAL FROM THE WHITE WATER; SEPARATING WATER FROM SAID FLOCKS BY GRAVITY SEPARTION TO OBTAIN CLEARED WATER AND RECYCLING MOST OF THE CLEARED WATER FOR USE IN MANUFACTURING PROCESSES; AND RETURNING THE FLOCKS TO THE PULP WEB TO FORM CONSTITUENT MATERIAL IN THE FINAL PRODUCT OF THE MANUFACTURING PROCESS.
2. The method of claim 1 wherein the acidic substance is a metallic salt.
3. The method of claim 1 and including separating the cleared water into two fractions, one fraction being recycled and used as fabrication water, the other fraction being discharged to a recipient, and wherein the amount of water discharged is only that necessary to maintain the water balance of the manufacturing process.
4. The method of claim 1 wherein such quantities of said alkaline substance and of said acidic substance are added that said flock formation occurs near the isoelectric point.
5. The method of claim 1 and including the addition of a polyelectrolyte for fine regulation of total charges on the suspended materials.
6. A method of recovering noil fibres and soluble wood material in white water from a manufacturing process involving the formation of a pulp web by separating flocked out material from water to produce cleared water and returning the material flocked out to the pulp web for retention as a beneficial constituent of the manufactured product, comprising: adding a sufficient quantity of an acidic substance to white water to prevent premature coagulation of suspended material; then adding as a coagula-agent a meterial whose presence in the pulp web formed is beneficial selected from the group consisting of phenoformaldehyde resin, carboxymethylcellulose, urea resin, melamine, linseed oil emulsion, polyvinylchloride-latex emulsion and acrylic latex emulsion; thoroughly mixing said white water with said coagulating agent to obtain a substantially homogeneous suspension; after said mixing, adding a sufficient quantity of an alkaline substance to the suspension to raise the pH to form flocks incorporating said coaGulating agent, noil fibres and soluble wood material from the white water; separating water from said flocks by gravity separation to obtain cleared water and recycling most of the cleared water for use in manufacturing processes; and returning the flocks to the pulp web to form constituent material in the final product of the manufacturing process.
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