Calcium carbonate waste from an integrated pulp …
The concentrations of easily soluble nutrients (P, Ca, Na, K, Mg, S, Cu and Zn) are given in Table 2. With respect to the macroelements in the PCC waste, calcium is the most abundant, followed by sodium, sulphur and potassium. The Ca concentration (168.5 g kg−1; dw) in the PCC waste is ca. … See more
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An Overview of Calcite Recovery by Flotation
In general, precipitated calcium carbonate (PCC) is used as a mineral filler in paper industries; while natural calcite (CaCO 3) ore is also suitable for industrial use if …
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A new process to produce high-quality PCC by the
A new process has been developed to produce high-quality precipitated calcium carbonate as a paper filler by using the causticizing process in a kraft pulp mill. The causticizing process converts ...
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Energy saving in papermaking by application of …
Abstract. Hybrid calcium carbonate (HCC) is prepared by pre-flocculating calcium oxide and ground calcium carbonate (GCC) with ionic polymers, and by injecting carbon dioxide to the pre-flocculated flocs until …
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The Dolomite Problem: A Matter of Time
Dolomite, CaMg(CO 3) 2, is an abundant carbonate mineral in ancient rock formations, but it is extremely scarce in modern sedimentary environments.This intriguing observation has been repeatedly referred to as the "dolomite problem" in the geological literature. Many geoscientists over time have almost obsessively searched for a solution …
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A review: the utilization potency of biopolymer as an eco …
Harsher calcium carbonate deposition is evaluated at the conditions of phase separator/degasser units due to the higher pH of produced water after released CO 2 from the fluid. Calcium carbonate scale can also deposit in transport flowline, especially at high temperature during summer in the desert area, along with higher pH of the produced …
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Controlling scale deposit in pulp, paper industry
Most paper mills have water treatment plants, with many using bore-hole water, which has high levels of calcium carbonate. Despite the use of acid dosing, plants generally suffer with scale necessitating water treatment alongside the dosing. Not only is the process expensive, but acid dosing also causes corrosion. Green Liquor Lines
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Utilization of Lime Mud Waste from Paper Mills for …
Lime mud was collected from the Moorim paper mill in Ulsan, Republic of Korea. The composition of raw lime mud was predominantly calcium carbonate with small amounts of other oxides containing Al 2 O 3, SiO 2, SO 3, P 2 O 5, Na 2 O, Fe 2 O 3, and MgO. Hydrochloric acid (HCl, 35–37% concentration) and sodium hydroxide (NaOH, 97% …
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CaCO3 solubility in the process water of recycled …
Graphic paper grades in the recovered paper contain up to 38% fillers and coating pigments (Holik 2006). Fillers and coatings are used to enhance optical properties and print-ability. 75% of pigments are based on calcium carbonate (Confederation of European Paper Industries 2019). Austra-lian recycled containerboard contains a calcium carbonate
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(PDF) Anti-scaling agents in kraft pulping
This work examines the action of diethylene triamine penta (methylene phosphonic acid) (DTPMPA), either alone or combined with commercial anti-scaling agents, as an inhibitor of calcium carbonate ...
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Development of Deformable Calcium Carbonate for High Filler Paper
1. Introduction. Replacing chemical pulp with inorganic materials such as calcium carbonate without loss of key paper properties in papermaking is a dream come true for the papermakers and beneficial for forest conservation, drying energy reduction, and production cost saving. 1 In reality, achieving 1–2% increase in inorganic filler content in …
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2-3 Lime Kiln Chemistry & Effects on Operations
calcium compounds in the 95 wt% CaCO3 may include small amounts of calcium hydroxide (free lime), calcium sulphate, calcium phosphate and calcium silicates. Similarly, MgO may include magnesium hydroxide, magnesium carbonate, magnesium sulphate, and minerals such as dolomite (CaCO3•MgCO3) and silicates. Na2O and
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Biomass-based carbon capture and utilization in kraft pulp mills …
Produced calcium carbonate is then used to whiten and smoothen the paper surface (Nanri et al. 2008). Typically, lime kiln flue gasses are bubbled through green liquor. The amount of calcium carbonate produced is typically fixed to correspond the local demand. ... Lu C (2013) Utilization of lime mud from paper mill as CO 2 sorbent in …
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The second century CE Roman watermills of Barbegal
Carbonate deposits formed in modern watermills and in ancient mills in Venafro, Saepinum, Athens (5, 25), and Ephesos that functioned in open air also show porous micritic deposits despite fast and highly turbulent water flow. In contrast, carbonate deposits formed on the Barbegal woodwork are unusually dense and sparitic for …
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Mineral carbonation of a pulp and paper industry …
Abstract. This study focuses on the mineral carbonation to capture CO2 using an alkaline industrial waste, the grits, formed during the kraft pulp production process. An …
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Scale deposits in kraft pulp bleach plants with reduced water
The main types of deposits which may form in chemical pulp bleach plants are calcite, calcium oxalate and barite. Calcite deposits form in alkaline conditions (pH = 8–13) and at high temperature. Any contact with air may enhance precipitation, through CO 2 stripping. This is important in washing stages.
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AKD sizing efficiency of paper filled with CaCO3 from the …
Full Article. AKD Sizing Efficiency of Paper Filled with CaCO 3 from the Kraft Causticizing Process. Jian Wang, a,b, * Ling Liu, a Zhijie Wang, a and Yongjian Xu a Causticizing calcium carbonate (CCC), known as lime mud, is a by-product of the papermaking industry that comes from the green liquor causticizing process.
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Inorganic scale control in today's pulp mills
Calcium carbonate readily forms scale deposits under the high temperature, alkaline pH and high pressure conditions of a Kamyr continuous digester. Wood and white liquor are …
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Synthesis of precipitated calcium carbonate: a review
The current high global demand for high-quality paper, paint, adhesive/sealant, and plastic, filler industries cannot survive without unique and high-quality precipitated calcium carbonate (PCC). They are used as fillers, additives, and reinforcements. PCC is a key constituent of the modern paper and plastic industry. This …
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Green liquor dregs and slaker grits residues
Pulp and paper mills would no more spend with the landifilling high cost, meaning economical gain, and these residues are also able to prevent earth extraction of calcium carbonate and cheap source of raw materials to ceramic industries, reflecting on a sustainable process with no further environmental damage, closing a sustainability cycle. 4.
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TECHNICAL SUPPORT DOCUMENT FOR THE PULP AND …
chemical pulp and paper mill would include all three process areas. Some pulp and paper mills may also include converting operations (e.g., coating, box making, etc.); however, these ... the calcium carbonate is converted to calcium oxide (i.e., lime, a material used in the chemical recovery process) and biomass CO2 which is released to the
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Calcium migration inside anaerobic granular sludge: …
As shown in Fig. 1, a non-microbial core with 0.5–1.0-mm in diameter, which was identified as calcite was coated by biomass layer.The calcite core was surrounded by a periodical ring-structure of calcium deposition. A similar core-ring pattern was previously reported in granular sludge [23], [24].Yamaguchi observed a double-layered structure in …
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Utilization of Lime Mud Waste from Paper Mills for Efficient …
Lime mud was collected from the Moorim paper mill in Ulsan, Republic of Korea. The composition of raw lime mud was predominantly calcium carbonate with small amounts of other oxides containing Al 2 O 3, SiO 2, SO 3, P 2 O 5, Na 2 O, Fe 2 O 3, and MgO. Hydrochloric acid (HCl, 35–37% concentration) and sodium hydroxide (NaOH, 97% …
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Production capacity, paper products and kaolin and calcium carbonate
Join for free. Download Table | Production capacity, paper products and kaolin and calcium carbonate demand for selected paper mills in China. from publication: Kaolin and halloysite deposits of ...
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Using Electric Field to Improve the Effect of Microbial …
The precipitation of calcium carbonate induced by Sporosarcina pasteurii (S. pasteurii) has garnered considerable attention as a novel rock and soil reinforcement technique. The content and structure of calcium carbonate produced through this reaction play a crucial role in determining the rocks' and soil's reinforcement effects in the later …
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PALEOENVIRONMENTAL DISTRIBUTION OF LARGER …
The lagoonal deposits, which are exposed in the area of Homes Morts (HM section), consists mainly of about 2 m of gray marl and intensely bioturbated marly limestone with some stony corals, bivalves, and larger foraminifera. The microfacies for this lithofacies consist of wackestone-packstone with Om. macroporus, Fas. colomi and small miliolids ...
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Calcium carbonate in the paper industry – …
But the high amount of calcium carbonate in paper for recycling and the closure of water circuits leads to a high concentration of calcium ions in the process water of paper …
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Calcium Deposits (Calcification): Types, Causes & Risks
Calcium deposits, or calcification, can occur when calcium builds up in your body. This buildup of calcium can harden in your tissues, organs or blood vessels. When this happens, your body's normal processes may not run correctly. Your bones and teeth use almost all the calcium in your body (about 99%). The remaining calcium dissolves in your ...
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Water | Free Full-Text | Electrodeposition of Calcium Carbonate and
A Feature Paper should be a substantial original Article that involves several techniques or approaches, provides an outlook for future research directions and describes possible research applications. ... They reported the growth of calcium carbonate deposits on graphite cathode and anode, at different calcium chloride concentrations (0.5 and ...
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Producing flexible calcium carbonate from waste paper and …
INTRODUCTION. Replacing chemical pulp with inorganic materials, such as calcium carbonate (CaCO 3 ), without loss of key paper properties in papermaking is beneficial …
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