In-line production of silica for retention purpose

A technology of silica and retention aids, applied in the direction of addition of retention aids, inorganic chemistry, silicon compounds, etc., can solve the problems of unfriendly transportation, expensive environment, low solid content, etc., and achieve the improvement of colloidal instability and improvement The effect of control

Active Publication Date: 2016-01-06
STORA ENSO OYJ
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solids content of the readymade colloidal silica product is e.g. very low, which leads to expensive and environmentally unfriendly transport of the product into paper/board mills and higher CO 2 the footprint
Another issue associated with t

Method used

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  • In-line production of silica for retention purpose
  • In-line production of silica for retention purpose
  • In-line production of silica for retention purpose

Examples

Experimental program
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Embodiment Construction

[0040] "In-line production" means that the retention aid is at least partially formed directly in the papermaking stock stream, rather than being produced separately from the papermaking process.

[0041] Different types of dosing systems that may be used in conjunction with the present invention are disclosed in eg WO20111 / 110744, US2007258316, WO0225012, US2007258315 and US20080011788.

[0042] According to the present invention, there is provided an in-line production process in which additives such as sodium silicate and acidic medium are fed into the short cycle of the paper machine, ie into the fiber web or paper stock. When forming silica-based retention aids according to the invention, the reaction between acid and silicate to form silicic acid and further polymerization to colloidal silica can take place in the stock suspension. Alternatively, also within the scope of the present invention, the silicic acid can already be formed in the dosing device, but the polymeriz...

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PUM

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Abstract

The present invention discloses an in-line production method for providing a retention agent into a liquid flow of a stock suspension and into the short circulation of a paper making machine, wherein the method comprises the steps of: (i) providing a liquid flow of a stock suspension; and (ii) feeding at least one additive into said liquid flow of the stock suspension, wherein said retention agent is formed directly in said stock suspension. The at least one additive may be added to the stock suspension e.g. as a liquid flow. The retention agent provided by the method of the invention may further improve the control of the dewatering rate and subsequently the strength properties of the paper. By this method there is provided a way of forming a retention agent directly into the stock suspension. The need of transporting, e.g. a readymade solution of a retention agent is thereby abolished, and thus the retention aid may be formed in a very cost-efficient way. Further as the retention agent is formed directly into the stock suspension it may very quickly and efficiently adhere to the fine particles, or the filler in the stock suspension and thus a more efficient effect may be achieved.

Description

technical field [0001] This document relates to an in-line production process for a papermaking process and a boardmaking process, and for the simultaneous delivery of at least one additive into the stock suspension of a paper or board machine to form a retention agent (retention agent) method. Background technique [0002] Silica is commonly used alone or with another ingredient as a retention chemical or agent to retain fine materials, mainly dissolved colloidal substances, chemicals, fines (fines, fines) and filler particles. Silica can be produced in many ways, such as dialysis, electrodialysis, neutralization, peptization, and one common commercial method is by sodium metasilicate (with the common name sodium silicate (Na 2 SiO 3 ), which is also known as ion exchange of water glass). Other methods are also described in the literature, such as the treatment of water glass with acid followed by the formation of silica in tanks or containers. [0003] However, these ...

Claims

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Application Information

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IPC IPC(8): D21H21/10C01B33/143D21H17/13D21H17/70C02F1/52D21H17/66D21H17/68D21H23/18
CPCD21H23/18C02F1/5236C02F2103/28D21H17/65D21H17/68D21H21/10
Inventor P.哈坎森
Owner STORA ENSO OYJ
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