green liquor pulp physical

May 01,  · Green liquor (GL), another mill-generated process stream, has a rich hydrosulfide content not unlike black liquor, yet it is very easily accessible in all kraft pulp mills because it is a process liquor derived from the alkali recovery system that closes the alkali chemical loop.

in water to form green liquor. The green liquor is then sent to the causticizing plant, where it is reacted with lime, CaO, to convert the Na2CO3 to NaOH. Conversion is measured by causticizing efficiency, typically 80 to 83%. The Na2S passes through the causticizing step unchanged. The causticized green liquor is known as “white liquor”

mining waste. Simultaneously, Swedish paper and pulp industry – another important base industry, produces large amounts of alkaline residuals. Green liquor dreg (GLD) is the larg-est residual fraction, approximately 300 000 tonnes/yr is retrieved in the chemical recovery cycle at Swedish sulfate pulp mills.

Green liquor dregs (GLD) are a major waste of the pulp and paper industry, and their correct classification is important to finding alternatives to landfill disposal. In the European Union, the methodology to determine the hazard property HP 14 (“ecotoxic”) is under discussion. Although biological tests are likely more representative of wastes’ environmental behavior, there are still no

The method to find kappa # of pulp is described in TAPPI T236. Lignin in Pulp Commercial pulp range in lignin content from 1.0% for "soft cook" chemical pulp, about 8% for "hard cook" chemical pulp and up to 16% for semi-chemical pulp.In general lignin affects the properties of pulp in adverse manner.

Based on liquor displacement technology • Pressurized liquor accumulators • Improved heat economy • Low temperature impregnation possible • Liquor concentration profiling during impregnation and cooking • Gentle pump discharge • So far, the highest measured pulp strength delivery with softwood pulp equals laboratory made pulp

green liquor so that scheduled maintenance could be performed on the process slaker. Operators often used a 12' long bar inserted in the actuation mechanism to break the valve from the open position and close it. The tapered plug valve was difficult to operate due to severe scaling from the green liquor recausticizing process.

Green liquor is the dissolved smelt of sodium carbonate, sodium sulfide and other compounds from the recovery boiler in the kraft process.The liquor's eponymous green colour arises from the presence of colloidal iron sulfide. The green liquor is usually reacted with lime (CaO) in the causticizing stage to regenerate white liquor.Alternatively, green liquor can be used prior to white liquor to

Maria Mäkitalo's 9 research works with 90 citations and 464 reads, including: Variation of green liquor dregs from different pulp and paper mills for use in mine waste remediation

sulfide. Inorganic chemicals present in the black liquor collect as a molten smelt at the bottom of the furnace. The smelt is dissolved in water to form green liquor, which is transferred to a causticizing tank where quicklime (calcium oxide) is added to convert the solution back to white liquor

Valmet offers products that separate dregs from green liquor and increase the efficiency of the recausticizing process. The dregs handling encompasses systems that wash and dewater dregs efficiently with minimal or no mud consumption. Valmet has several green-liquor handling equipment alternatives, which all meet the primary aim, to reduce the dregs content.

Feb 23,  · ( ). Green Liquor Pretreatment of Mixed Hardwood for Ethanol Production in a Repurposed Kraft Pulp Mill. Journal of Wood Chemistry and Technology: Vol. 30, , pp. 86-104.

Dec 10, · Once green liquor dregs and slaker grits represents larger fraction of solid wastes generated at pulp and paper mills and are recognized by high calcium carbonate contents (Simão et al., ; Castro et al., ), essential raw material of the ceramic industry and, thus, great application potential in its traditional products used in

osti.gov technical report: highly energy efficient d-glu (directed-green liq-uor utilization) pulping

fibres, now called pulp or "brown stock," are separated from the spent cooking liquor (black liquor) in the pulp washers. The kraft process is associated with strong-smelling gases - organic sulphides - which are an environmental concern. The dilute or "weak" black liquor (10-15% solids) comes from the washers.

Grits, green liquor dregs and lime mud represent the largest fraction of solids among all of the waste generated at pulp mills. The composition of grits varies widely, containing crystalline phases such as calcite 29 and several metal ions such as barium, chromium, copper, lead, nickel and zinc 8 .

Unbleached kraft pulp, bleached kraft pulp. Chemical curve: R.I. per Green liquor density g/l at ref. temp. of 20˚C. Introduction. The chemical recovery process ensures the operation . and economic viability of the mill. In this process, the pulping chemicals are regenerated from the inorganics

The improved process is achieved by introducing depuration of green liquor and lime before causticization and two special causticization steps in causticization procedure of conventional chemical recovery processes. It not only avoids the generation of waste residue (lime mud) from the beginning and saves the re-burning and filling land of lime mud, but also can directly produce a series of

1) green liquor pulp: Notice: Some description was translated by software and the data is only as a reference. Patent: 1) Method and system for printing image using template and recording medium storing the method 2) Processing method of enhancing opening speed of word processing file 3) Saving method for file editing environment and return

Decanted green liquor is transferred to the causticizing area, where the Na2CO3 is converted to NaOH by the addition of lime (calcium oxide [Ca0]). The green liquor is first transferred to a slaker tank, where Ca0 from the lime kiln reacts with water to form calcium hydroxide (Ca(OH)2).

Feb 02,  · International technology Group ANDRITZ has successfully started up the pulp line delivered to JSC Arkhangelsk Pulp and Paper Mill (APPM) at the Novodvinsk mill, Russia. The new line features ANDRITZ green liquor technology for efficient pulp cooking, refining, and washing and produces 1,000 t/day of semi-chemical pulp for the production of corrugated board from birch and aspen.