An Australian pulp producer used CADSIM Plus simulation modeling to study the level of carryover and breakthrough problems occurring in the bleach plant rotary vacuum drum washers. The investigation showed the relationship between shower flow breakthrough and organic recycle resulting in a significant level of organic recycle.
Chat OnlineThe control system also accounts for variations in production temperature etc. The Kappa number after the alkali extraction stage is also measured on-line. The control system is installed in a bleach plant for softwood kraft pulp where the residual chlorine has decreased
Chat OnlineThe drum filter is used to remove the dissolved solids and unreacted chemicals from the pulp with wash water. In order to model the drum filter different models can be used. In this study Norden efficiency approach (Norden 1966 Norden and Pekkanen 1987) is used in order to model the drum filter. In the model the Norden efficiency factor
Chat Onlinechemical pulping process . Chemical pulp is a type of paper pulp. It is the kind of pulp that dissolve plant fiber by chemical method. The raw materials for making chemical paper pulp are plant fiber. People use chemical agent that can start selective chemical reaction with the lignin in the raw materials.
Chat OnlineThe ANDRITZ GasFree Filter is an advanced vacuum drum filter washer. GF-Filter washers can be used for brownstock post-oxygen and bleach plant washing. Most typically they are installed as a retrofit to an existing line and can complement the washing process in special cases when only one stage of washing is required and the washing stage
Chat OnlineANDRITZ SPECTRUM Magazine. ANDRITZ SPECTRUM Magazinepage 38-39. 38. 39. SPECTRUM NO.30 / 2-2014 mechanical pulp plant and board machine. Riikinvoima. Leppävirta Finland. disc filters and refiners for kraftliner. and corrugated medium production. FIBRIABarra do Riacho
Chat OnlineProduct Wet-lap pulp for paper and tissues Major EquipmentBleaching towerDeinking blowerFiber flow drum pulperDeflaker pumpPressure screensFilter pressConveyorsHeat exchangers Belt pressSteam mixerMDR mixer Phoenix Equipment Corporation phxequip 1 732 442 6990 Jesse Spector plants phxequip Edward Zhang
Chat OnlineThe present invention relates to a method and an arrangement for washing a chemical pulp in bleaching wherein the pulp is subjected to at least two steps at least one of which is a bleaching step and the treated pulp is washed before and / or after each treatment step. and
Chat OnlineDec 01 2005 · The earliest bleach plants using chlorine dioxide were often retrofits or at least using downflow chlorine dioxide bleaching towers. Upflow towers a new design that appeared in about 1955 ensured the pulp stream had adequate back-pressure to hold the reagent in solution until exhaustion minimizing escape to atmosphere.
Chat OnlineIntroducing the FlexJet™ Family of Headboxes. Latest paper making innovation centers on flexibility and performance
Chat OnlinePlate 19.1 shows handsheets made from pulp at various stages of the bleaching process. Plate 19.2 shows several washers of a four-stage bleach plant. As chemical pulps are dark to begin with bleaching increases brightness up to 70 with a maximum brightness of about 92 .
Chat OnlineIntroducing the FlexJet™ Family of Headboxes. Latest paper making innovation centers on flexibility and performance
Chat OnlineAn Australian pulp producer used CADSIM Plus simulation modeling to study the level of carryover and breakthrough problems occurring in the bleach plant rotary vacuum drum washers. The investigation showed the relationship between shower flow breakthrough and organic recycle resulting in a significant level of organic recycle.
Chat OnlineApr 09 2017 · Vacuum drum filters are the most frequently used continuous rotary filters in solid/liquid separation. From gas-tight to pressure belt designs living up to the latest ATEX requirements they can
Chat OnlineIn-line filters can have a single or duplex arrangement. A single in-line filter is used in applications where the flow can be interrupted or the filter can be bypassed when the filter element is serviced. Duo filters are used when continuous filtration is required. Learn More
Chat OnlineReduction of AOX in the Bleach Plant of a Pulp Mill MARIA JOA˜ O M. C. BARROCA ISABEL M. expressed as AOX in the bleach plant of a kraft pulp mill processing Eucalyptus drum washer of a conventional bleaching sequence to the entrance of the bleach plant. This gives rise to a cleaner
Chat OnlineThe proven multi-stage washing efficiency in the ANDRITZ DD-Washer is clearly preferred for brownstock post-oxygen and bleaching washing in mills around the world. With more than 340 installations around the world the DD-Washer is clearly preferred for all fiberline washing applications.
Chat OnlineWe ve worked in pulp mills paper mills and woodyards encompassing an extensive array of pulp paper and wood products to upgrade countless causticizing recovery bleaching stock prep coating and recycling systems as well as paper machines.
Chat OnlineOne of the primary uses of water in a pulp and paper mill is the pulp washing but efficient washing will supply the bleach plant with clean pulp while minimizing the amount of wash water used. There is also a pronounced effect of temperature on washing and reducing water usage can
Chat OnlineIn-line filters can have a single or duplex arrangement. A single in-line filter is used in applications where the flow can be interrupted or the filter can be bypassed when the filter element is serviced. Duo filters are used when continuous filtration is required. Learn More
Chat OnlineThe filter is also frequently used in dewatering applications. Unique open filter drum design Pulp washing using vacuum for wash water displacement and dewatering is a highly proven washing technology. However the CC-filter s unique open-drum design provides many benefits compared to conventional drop-leg drum filters.
Chat OnlineBleaching principle is to mix bleach and size for chemical reaction reaction products residue bleach from the paper pulp washing out. Bleaching includes oxidative bleaching and reductive bleaching. Oxidizing bleaching is the process of oxidizing lignin and pigment in pulp
Chat OnlineThe kraft process (also known as kraft pulping or sulfate process) is a process for conversion of wood into wood pulp which consists of almost pure cellulose fibers the main component of paper.The kraft process entails treatment of wood chips with a hot mixture of water sodium hydroxide (NaOH) and sodium sulfide (Na 2 S) known as white liquor that breaks the bonds that link lignin
Chat OnlineIn this study a steady-state model was developed for a six stage bleaching system in a pulp and paper industry. A fortran source code was written to simulate the whole bleach plant. Different case studies were performed with the aim of decreasing the total amount
Chat OnlineBleaching A modern mill is able to achieve fully bleached pulp from a four-stage elemental chlorine free (ECF) bleach plant. A D 0 E o D N D bleaching sequence is used. High-efficiency pressure filters are used for washing between bleaching stages. All stages are medium consistency to reduce pumping requirements. The D 0 stage is at 60ºC and
Chat OnlineContinuous Sodium Hypochlorite Process Systems. Advantages. The Powell Continuous Sodium Hypochlorite Process System also referred to as a Bleach Plant is designed to manufacture sodium hypochlorite with greater efficiency and higher quality than previously obtainable with batch or continuous methods.
Chat OnlinePulp Bleaching Processing. Pulp bleaching processing is one of the important pulp making processes whose purpose is to improve the brightness that is commonly known as whiteness in order to suitable for the different needs.The pulp bleaching processing methods include the delignification and lignin retention bleaching or the oxidation and reduction bleaching.
Chat OnlineControl of pulp and water flow rates out of a bleaching tower in a multistage pulp bleaching process wherein each stage comprises a bleaching tower and a washing drum comprises the steps of (a) measuring total weight of pulp composition per square meter on at least one washing drum and from such measurement and the speed of rotation and area of the washing drum surface and the
Chat OnlineTiFab manufactures titanium upflow tubes cones reducers piping and diffusers for bleach plants as well as pressure vessels exchangers for production of sodium hypochlorite and sodium chlorate. Our various materials of construction include titanium and titanium lined. Contact us today for your pulp
Chat OnlineSedimentation flotation mixing pulp separation and chemical recovery systems are among the myriad of process equipment WesTech supplies to the pulp and paper industry. Customized to the unique needs of operating plants WesTech liquid/solids and liquid/liquid separation expertise is built upon years of working with plant operators and owners.
Chat OnlineThe world s only all-in-one multi-stage displacement pulp washer The Kadant Chemi-Washer® is a proven performer for brown stock and bleach plant applications the world over. In-line filters can have a single or duplex arrangement. A single in-line filter is used in applications where the flow can be interrupted or the filter can be
Chat OnlineIn the second stage after refining the pulp is screened cleaned and most of the process water is removed in preparation for paper making. Paper Pulp Bleaching Process. Raw pulp contains an appreciable amount of lignin and other discoloration it must be bleached to produce light colored or white papers preferred for many products.
Chat OnlineSep 10 2018 · https //andritz/products-en/recycling/recycling/pulper-rags-rejects ANDRITZ Recycling supplies complete processes and equipment for the recovery and
Chat OnlineWhen it is done well increased black liquor solids decreased carryover to the bleach plant and/or paper machine and decreased environmental impacts result. Modern washing systems have been integrated into the heart of the kraft recovery cycle 10 11 . Satisfactory pulp washing is achieved with a
Chat OnlineSedimentation flotation mixing pulp separation and chemical recovery systems are among the myriad of process equipment WesTech supplies to the pulp and paper industry. Customized to the unique needs of operating plants WesTech liquid/solids and liquid/liquid separation expertise is built upon years of working with plant operators and owners.
Chat OnlineThe bleaching agents and the sequence in which they are used depend on a number of factors such as the relative cost of the bleaching chemicals type and condition of the pulp desired brightness of the paper to be produced and sometimes in response to environmental guidelines and regulations. Bleaching of mechanical pulp is much different
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