high concentration of pulp slurry tank which strong

How to achieve accurate Slurry and Pulp Level Measurements

Jun 21, 2017 ... Accurate Slurry and Pulp Level Measurement when there is a froth or foam on top of the flotation cell, mixing tank or sump can be challenging under many conditions. ... Changing slurry apparent specific gravity will cause the float ball to ride higher or lower in the slurry even if the slurry level stays constant.

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Bleached Kraft Pulp - NC State: WWW4 Server - NC State University

Market pulps are usually received as bales having a moisture content in the range of 10 to 20%, and these are dispersed with strong agitation in a hydropulper tank. Most grades of paper require the pulp to be refined by passing a slurry of 2 to 5% solids content between rotating metal bars of a refiner. The refining can be...

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Pulp and Paper Industry Wastewater and Water Treatment Solutions

Sedimentation, flotation, mixing, pulp separation and chemical recovery systems are among the myriad of process equipment WesTech supplies to the pulp and ... This black liquor is sent to multiple effect evaporators to be concentrated. ... The slurry flows through a series of agitated tanks in a process known as causticising.

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Pulp & Paper Industry Solutions - Southeastern Automation

the pulp. Pulp stock leaving the digester is a brownish liquid that is usually bleached to make more acceptable white paper. This process uses large quantities of ... Chemical pulping, the most common process of producing a pulp slurry from wood chips, involves strong chemicals that are typically regenerated and reused.

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The Pulp and Paper Industry

This is a part mechanical, part chemical process that produces a strong pulp. ..... therefore normally the concentration of dissolved oxygen around the fibre. Originally a high pulp consistency (30-40%) was used to overcome this restriction. However .... After slaking, the slurry is carried through a series of agitated tanks, which.

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(6) Technology Review for Pulping and Papermaking Processes - EPA

Nov 16, 2011 ... Deckers are used to thicken the pulp slurry or reduce its liquid content after the pulp washing system and prior to high-density pulp storage. The decker system includes decker vents, filtrate tanks, associated vacuum pumps, and related equipment. The kraft pulping vent gas emission limits apply for all new...

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recausticizing - Tappi

often have problems with high silica levels. CHEMISTRY OF COOKING LIQUOR PREPARATION. Digester operators are primarily concerned with the effective alkali (EA) of the white liquor. They use this value to calculate the volume of cooking liquor they will need to process wood chips in the digester. The active alkali (AA).

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Pulp and Paper Making Processes - Princeton University

2-3. 2-4. Figure. Overall View of Papermaking From Chemical Pulp by the Kraft Process. Stone Groundwood Pulp Mill Flow. ... and strong fibers that impart strength to paper and are used for boxes and packaging. Hardwoods .... the mechanical pulp was not bleached, but the bleaching of groundwood has increased and im-.

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Resin in Pulp with Strong Base Resins as a Low Cost, Viable ... - SGS

of the tank. This has several claimed advantages: •. There is no back mixing of pulp as occurs in a traditional CIP plant when carbon and pulp are pumped up stream countercurrent to the flow of slurry. This increases the steady state concentration of gold in solution in each of the tanks, which improves the gold adsorption...

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the institute of paper chemistry, appleton, wisconsin ipc ... - CiteSeerX

board. "Kraft" is derived from the German word for "strong," which reflects the high strength of paper products derived from kraft pulp. This high strength, ..... levels. In some cases, thiosulfates are generated when weak wash liquor is used to scrub lime kiln flue gases before being used as dissolving tank make-up liquor.

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Conductivity Measurement of White Liquor - Emerson

Careful monitoring of the alkali concentration throughout the. Kraft Process ... The Kraft Process uses strong chemicals (liquors) at very high pH to delignify the wood, turning it into pulp that can be formed into paper and paper products. Alkali concentration, expressed ... weak wash liquor to the smelt tank is regulated to keep.

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Fisher® Pulp and Paper Solutions - Emerson

packing box leaks. Additionally, this slurry is very erosive due to high solids content, and must maintain tight shutoff. White Liquor Pressure Filter Switching. Fisher® Pulp and Paper Solutions | 19. Re covery. Product Solutions. ▫ EXTENDED SERVICE LIFE. Heavy duty valve bearings and PTFE packing extend service life...

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IPSTTechnical Paper Series Number 524 Pulp ... - SMARTech

Now, however, there are strong incentives to operate at higher consistency whenever ... The unique characteristics of pulp slurries in pipe flow have been reported .... consistency increased. This work laid the foundation for technology to enable centrifugal pumping of medium consistency suspensions. (19,20), which will be.

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STEEL TANKS

Higher strength means less material and less labor. We installed the CarbonSeal Tank Repair System as a 3 year repair. That was 7 years ago and it is still doing great. Jim M, Project Manager, Pulp & Paper Plant. STEEL TANKS. CHEMICAL RESISTANCE. *Please call 520-322-0010 or. Toll-Free (US) 877-303-0453 to.

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dynamic simulation of the carbon-in- pulp and carbon-in ... - SciELO

alkaline slurries. The continuous processes of gold recovery by adsorption on activated carbon in agitated tanks, namely the carbon-in-pulp (CIP) and ..... The high value of the zero-order constant for the cyanide consumption kinetics (Eq. 17) indicates a strong presence of cyanide consumers. The estimated net volume of...

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Category Title NFR: 2.H.1 Pulp and paper industry SNAP: 040601 ...

pulping and the amount of bleaching used depends on the nature of the feedstock and the desired qualities of the .... strong black liquor storage tanks and from the black liquor oxidation process. The soap can ... pulp strength. In the acid sulphite process, a caustic solution (cooking liquor) is used under high temperature and.

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Caustic cleaning quality: Condition crucial to increased ... - ICSOBA

pumps that are positioned in the discharge of thickeners tanks mud. Over time, the interior will embedding reducing the pump suction flow and affecting the transfer of the pulp slurry to the remaining stages of the wash circuit. The cleaning solution is prepared with Xinhai soda and water with caustic concentration of 400 ± 50...

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Pulp and Paper Mills - Infrastructure Health & Safety Association

wood, but have high energy demands. Mechanical pulping generally incorporates thermal or chemical pre-softening of the wood chips, resulting in lower energy requirements. Some chemical ... The kraft process is associated with strong- smelling gases ... The concentrated black liquor then goes to the mix tank where the...

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Density Measurement for Quality Monitoring and ... - Endress+Hauser

Control of liquor concentration with. Gammapilot M. Radiometric liquor density measurement –. e.g. for green or black liquor – is standard in the pulp/paper industry. Due to the strong build-up in pipes, only external noninvasive measurement safeguards high plant availability. In such applications with a pipe diameter of DN...

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pH/ORP Cyanide Leaching Process Understanding Leaching of ...

The result is the formation of hydrogen cyanide gas, which is lethal in a concentrated state. The reaction also has an economic concern. It generates a high ... Leach tanks. Oxygen. (optional). Pulp to tails. Fresh carbon. Water, pulp, lime cyanide, gold. Leaching involves the dissolution of a mineral from a solid (ore).

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pH/ORP Cyanide Leaching Process Understanding Leaching of ...

The result is the formation of hydrogen cyanide gas, which is lethal in a concentrated state. The reaction also has an economic concern. It generates a high ... Leach tanks. Oxygen. (optional). Pulp to tails. Fresh carbon. Water, pulp, lime cyanide, gold. Leaching involves the dissolution of a mineral from a solid (ore).

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Recovery of uranium from dense slurries via resin-in-pulp - SAIMM

RECOVERY OF URANIUM FROM DENSE SLURRIES VIA. RESIN-IN-PULP. T Udayar, M H Kotze and V Yahorava. ABSTRACT. The revival of uranium as a valued commodity has prompted a ... available, RIP-grade strong-base resins for the recovery of uranium. .... when the chloride content was increased from 0 – 3 g/L.

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Density Measurement for Quality Monitoring and ... - Endress+Hauser

Control of liquor concentration with. Gammapilot M. Radiometric liquor density measurement –. e.g. for green or black liquor – is standard in the pulp/paper industry. Due to the strong build-up in pipes, only external noninvasive measurement safeguards high plant availability. In such applications with a pipe diameter of DN...

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1 chloride and potassium removal processes for kraft pulp mills

For years, pulp mills have purged a portion of precipitator ash to control Cl and K levels. However, although ... During the 1980's, some mills in Sweden operated their recovery boilers at high sulfidity levels to remove chloride by .... mixing in a stirred tank, the slurry passes to the separation stage, typically a filter or centrifuge.

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Biermann (pages 62-72)

slurry mass consistency = x 100%. 3.2 MECHANICAL PU LPING. Mechanical Pulp. Mechanical pulp is pulp produced by using only mechanical attrition to pulp .... However, advances in the process gave stronger pulps. The large amount of lines makes this pulp useful for increasing the opacity of some printing papers,...

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Fruit processing | Orange Book

Rejected fruit from grading, peel and rag from extraction , and washed pulp and other solid waste is sent to the feed mill where it is dried and pelletized for animal feed. .... Squeezer-type extractors are less sensitive to fruit size and shape but can lead to higher oil content in the juice and a higher ratio of damaged pulp than...

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Slurry pumps | Sulzer

Jun 15, 2017 ... The EMW pump range has been designed considering historic field experience, coupled with the latest in fluid flow modeling technologies and finite element analysis, to create the latest in slurry pumping technology. The pump range offers high hydraulic efficiencies for optimized wear life performance in...

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Effect of fiber length, flow rate, and concentration on velocity profiles ...

conditions, those models do not apply due to strong gravitational effects that result in concentration gradients. ... At higher crowding numbers, the velocity profiles tended to become flat, more symmetric, and ... Cellulosic suspensions are prevalent in pulp and paper processing, paper making, food processing, and the.

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Flow of pulp fibre suspension and slurries: A review

Two-phase (liquid–solid) flow of suspension and slurries. Hemstrom et al. (1976) ... of fibre concentration in the flow of pulp suspensions in a duct with various turbulence generators at the inlet. The concentration ..... Turbulence at high shear rates was investigated in three-phase systems in a stirred tank using laser Doppler...

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activated carbon in gold recovery - Kemix (Pty) Ltd

This article serves to discuss the fundamental aspects of gold recovery utilizing the. Carbon-in-Pulp or Carbon-in-Leach processes. The purpose is to describe in simple terms what activated carbon is all about and how it adsorbs gold. The understanding of the mechanism of gold adsorption is important because the CIP/CIL...

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Pilotscale processing with alkaline pulping and enzymatic ...

Nov 11, 2013 ... gest a high-cost structure for bioethanol production when the resource input is larger. However .... correlation with residual lignin amount in pulp; TAPPI ... to a 5m3 dilution tank, and diluted with tap water to form pulp slurry. The quantity of added water was approximately 10 times the cooked pulp weight.

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Glossary of Papermaking Terms

(1) Propeller or agitating shaft for stirring the pulp suspension in a chest or tank. ... Amount of dissolved oxygen consumed in five days by biological processes breaking down organic matter in mill effluent. BISULPHITE PULP. Pulp made by the ... Heavy graded papers possessing higher than average quality characteristics.

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Acid Leaching and Rheological Behaviour of Siliceous ... - UniSA

solid loading, Ni/Co recovery was the lowest (~15% ), and the pulp shear viscosity and yield stress systematically increased with time, leading to gelation. The implications of the findings are discussed in terms of improving lateritic ores' atmospheric acid leaching behaviour in agitated tanks. Keywords: Ni laterite ore; Acid...

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Pulp And Paper Manufacturing - XL Catlin

The modern pulp and paper mill is a complex, high-valued facility. To operate profitably under .... From the digester, the pulp is pumped or blown to a “blow tank,” where steam is flashed off, and is then passed ... liquor, then further concentrated to “heavy” black liquor in direct-contact evaporators that use the flue gas from the...

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Froth Flotation - Department of Chemical Engineering

concentration. Figure 1: The flotation system includes many interrelated components, and changes in one area will produce compensating effects in other areas ..... Strong collector, low selectivity. Less-used than fatty acids. Less collecting power, higher selectivity. Carbon is tetravalent, has four bonds; phosphorus is.

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NFR: 2. H. 1 Pulp and paper industry

pulping and the amount of bleaching used depends on the nature of the feedstock and the desired qualities of the .... strong black liquor storage tanks and from the black liquor oxidation process. The soap can ... pulp strength. In the acid sulphite process, a caustic solution (cooking liquor) is used under high temperature and.

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Paper pulp - European Environment Agency

pulping and the amount of bleaching used depends on the nature of the feedstock and the desired qualities of the end ... under high temperature and pressure to chemically dissolve the lignin that binds the cellulose fibres of the ... strong black liquor storage tanks and from the black liquor oxidation process. The soap can...

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Usage of Hydrated Lime (Calcium Hydroxide) & Quick lime (Calcium ...

Jan 27, 2012 ... If the system requires a lime slurry, the main way to determine if hydrated lime would be more suitable than quicklime is to know the amount that a given process requires. In systems that demand large quantities of lime, quicklime would be the preferred material as the density is twice the density of hydrated...

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LTM Slurry Pulp Level Monitoring Probe - Zeroday Enterprises LLC

The Z ChemGear™ LTM Slurry Pulp Level Monitoring Probe is the latest technology advancement for accurate and effective pulp and water level monitoring. ... algorithm, the LTM-2 probe accurately tracks slurry water height and is particularly effective measuring and monitoring slurry-froth and foam interface levels. LTM-2...

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Gold Mining Process Development – Denver Mineral Engineers

Agitated tank leaching; Heap leaching; Carbon adsorption recovery; Zinc precipitation recovery. Carbon adsorption recovery may include the following alternatives: Carbon-In-Pulp (CIP); Carbon-In-Leach (CIL); Carbon-In-Column (CIC). Refractory ore ... large enough to allow mechanical concentration to occur. The number...

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