Dry material exiting the sulphating kiln is cooled and gravity fed directly into the leach tank.Leaching and Residue RemovalLeaching takes place in a single stage leach tank which receives solids from the sulphating kiln, spent liquor and make up water.
The lithium carbonate slurry from the second crystalliser reports to the lithium thickener where the lithium carbonate crystals are allowed to settle to allow separation from the spent liquor.Product Recovery and PackagingThe slurry containing the lithium carbonate crystals is gravity fed onto a two stage wash centrifuge with intermediate hot condensate wash to remove residual sodium from the cake.
We continue to be committed to spent liquor gasification at Trenton and are working with TRI to gain even more steam production and energy savings."
The recovered sodium carbonate is mixed with water to produce a cooking liquor The project meets the total spent liquor requirements of the mill, and supplies cooking liquor and process steam back to the mill to support the pulp and paper making operation.
About 40 - 50,000 tonnes of spent liquor
is produced from the industry's pre--treatment plants every year.
Wong indicates every ton of pulp produces 1.7 tons of potassium spent liquor
. At a recent conference, Hurter, who guardedly acknowledged Wong's energy, work and conference attendance, publicly asked Wong whether he was in the non-wood pulp business or the liquor/fertilzer business.
* TIP 0607-23 "Viscosity of a neutral sulfite spent liquor
(Ostwald capillary viscometer)"
Topics addressed include small community integrated water resources supply and recycling, recycling and reuse of high purity water from semiconductor integrated circuits manufacturing processes, cleaner production by using electrodialysis in organic or aqueous-organic systems, recovery and recycling of waste acids from industrial spent liquors
using diffusion dialysis with new series of anion exchange membranes, improving resource cascading, environmental impacts of oil shale and coal electricity, strategies for reducing carbon dioxide emissions in rural communities of Botswana, the impact of economic incentives on recycling behavior, ulta-compact biofilm reactors for wastewater treatment and recovery, and decision support systems for material recovery and energy production.
It also includes a discussion of recovery of pulping spent liquors
and regeneration of chemicals used, the manufacture of side products, and on-site manufacture and handling of bleaching chemicals.