Compositions for use in geosynthetic liners
AssigneeImerTech SAS
InventorsChristos DEDELOUDIS, Monika ZERVAKI, Anton BELEV, Christina KAPRALOU
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Abstract
Described herein is a composition for use in a geosynthetic clay liner, the composition comprising particles, at least some of which are discrete particles and each comprise: a compacted swelling clay, the clay having been compacted such that it at least partially surrounds a fluid-loss preventing polymer. Also described herein is a clay liner formed from the composition, a method for producing particles for use in a geosynthetic clay liner, and a method of forming a clay liner.
Claims48
A method for producing particles for use in a geosynthetic clay liner, the method comprising:
- dry mixing first particles comprising a swelling clay and second particles comprising a fluid-loss preventing polymer,
- compacting the dry mixed first and second particles to form one or more compacted bodies,
- crushing the one or more compacted bodies to form discrete particles for use in a geosynthetic liner, at least some of the discrete particles comprising the swelling clay and the fluid-loss preventing polymer, wherein at least some of the fluid-loss preventing polymer is at least partially surrounded by the swelling clay.
A method as claimed in any one of the preceding claims, wherein the fluid-loss preventing polymer is selected from an anionic polymer, a non-ionic polymer and a cationic polymer.
A method as claimed in any one of the preceding claims, wherein the fluid-loss preventing polymer comprises an anionic polymer.
A method as claimed in any one of the preceding claims, wherein the fluid-loss preventing polymer comprises a polyanionic cellulose.
A method as claimed in any one of the preceding claims, wherein at least 90 wt % of the first particles, before they are dry mixed with the second particles, pass through a sieve having openings of 1.5 mm or less.
A method as claimed in any one of the preceding claims, wherein at least 90 wt % of the first particles, before they are dry mixed with the second particles, pass through a sieve having openings of 1.0 mm or less.
A method as claimed in any one of the preceding claims, wherein at least 90 wt % of the first particles, before they are dry mixed with the second particles, pass through a sieve having openings of 0.8 mm or less.
A method as claimed in any one of the preceding claims, wherein the first particles have a moisture content of at least 5 wt %.
A method as claimed in any one of the preceding claims, wherein the fluid-loss preventing polymer constitutes from 0.5 wt % to 10 wt % of the mixture of first and second particles.
A method as claimed in any one of the preceding claims, wherein compacting the dry mixed first and second particles to form one or more compacted bodies involves passing the first and second particles through a compactor that applies a pressure of at least 3.45×106 Pa (500 psi) to the particles.
A method as claimed in any one of the preceding claims, wherein compacting the dry mixed first and second particles to form one or more compacted bodies involves passing the first and second particles through a compactor that applies a pressure of at least 6.89×106 Pa (1000 psi) to the particles.
A method as claimed in any one of the preceding claims, wherein compacting the dry mixed first and second particles to form one or more compacted bodies involves passing the first and second particles through a compactor that applies a pressure of from 9.65×106 Pa (1400 psi) to 1.17×107 Pa (1700 psi) to the particles.
A method as claimed in any one of the preceding claims, wherein the compactor processes at least 0.5 mt of the first and second particles per hour (at least 1.5 mt, at least 1.7 Mt).
A method as claimed in any one of the preceding claims, wherein the crushing the one or more compacted bodies to form discrete particles results in the discrete particles, at least some of which have a particle size of from 0.2 mm to 3 mm.
A method as claimed in any one of the preceding claims, wherein the crushing the one or more compacted bodies to form discrete particles results in the discrete particles, at least some of which have a particle size of from 0.5 mm to 2 mm.
A method as claimed in any one of the preceding claims, wherein the crushing forms discrete particles, which are then sieved such that at least 90 wt % of the discrete particles pass through a sieve with openings of 3 mm.
A method as claimed in any one of the preceding claims, wherein the crushing forms discrete particles, which are then sieved such that at least 90 wt % of the discrete particles are retained on a sieve with openings of 0.2 mm.
A method as claimed in any one of the preceding claims, wherein the crushing forms discrete particles, which are then sieved such that at least 90 wt % of the discrete particles pass through a sieve with openings of 2 mm.
A method as claimed in any one of the preceding claims, wherein, the crushing forms discrete particles, which are then sieved such that at least 90 wt % of the discrete particles are retained on a sieve with openings of 0.5 mm.
A method as claimed in any one of the preceding claims, wherein, after the crushing, the discrete particles are separated into at least two samples having different size distributions:
- a first sample and a second sample, and, if the second sample contains larger particles than the first sample, particles from the second sample are re-processed to reduce their size or if the second sample contains smaller particles than the first sample, particles of the second sample are re-compacted to form one or more further compacted bodies, which are then re-crushed to form discrete particles with larger particles than the second sample.
A composition for use in a geosynthetic clay liner, the composition comprising particles, at least some of which are discrete particles and each comprise:
- a compacted swelling clay, the clay having been compacted such that it at least partially surrounds a fluid-loss preventing polymer.
A clay liner formed from a composition comprising particles, at least some of which are discrete and each comprise:
- a compacted swelling clay, the clay having been compacted such that it at least partially surrounds a fluid-loss preventing polymer,
- wherein the composition has been formed into a layer.
A method of forming a clay liner, the method comprising:
- providing a composition comprising particles, at least some of which are discrete and each comprise:
- a compacted swelling clay, the clay having been compacted such that it at least partially surrounds a fluid-loss preventing polymer, and
- forming the composition into a layer.
Dependencies are inferred from the claim text.