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Process for recovering sand and bentonite clay used in a foundry

Sand, bentonite clay and organics recovered as foundry waste from a green sand mold foundry are reclaimed for reuse in making new green sand molds and mold cores by a multi-step process involving both hydraulic and mechanical separation steps.

Method for making sand covered with bentonite, the sand, and a method for recycling molding sand for a mold using the sand covered by bentonite

Given green sand is obtained by a mixing operation that is carried out for a short period of time. Discarded sand is supplied as supplementary sand to a sand processing line, so that molding sand can be recycled. Green sand for a molding is used for facing sand or the pocket sand. Bentonite-covered sand is made by mixing reproduced sand, new sand, and discarded sand or any or all of them. The bentonite-covered sand is added to collected sand to supplement it. Also, the bentonite-covered sand is mixed with water, and used for facing sand or the pocket sand.

Process for recovering sand and bentonite clay used in a foundry

Sand, bentonite clay and organics recovered as foundry waste from a green sand mold foundry are reclaimed for reuse in making new green sand molds and mold cores by a multi-step process involving both hydraulic and mechanical separation steps.

Process for treating bentonite and products thereof

A process for treating a bentonite having a montmorillonite content of at least 85% which, when activated with sodium ions dried and ground, does not swell more than about 2.5-fold when gradually added to deionised water at room temperature and when crushed dried and calcined to an LoI of less than 4% at 190.degree. C. absorbs 16 to 22% by weight of water in a controlled environment at 25.degree. C. and a relative humidity of 40% by weight, which process comprises the following steps in the following order: i) drying to a moisture content from 25 to 35% by weight; ii) conditioning by crushing, mixing and/or extruding; iii) addition of water to form an extrudable paste having a moisture content of 25 to 40% by weight; iv) extrusion through a die preferably from 4 to 10 mm in diameter; v) drying to a moisture content from 10 to 14% by weight; vi) calcining at 120 to 250.degree. C. to an LoI of less than 4% at 190.degree. C.; and vii) reduction to particles.

Process for recovering sand and bentonite clay used in a foundry
Fabric softening bentonite agglomerates for use in laundry detergents
Asphalt waterproof composition containing waste tire chips and bentonite and process for its manufacture


1 7030064 Bentonite nodules
2 6834706 Process for recovering sand and bentonite clay used in a foundry
3 6820692 Bentonite nodules
4 6793726 Aqueous suspensions with bentonite for mastics and sealants
5 6616743 Aqueous emulsions, with bentonite for cold application bitumen
6 6591891 Method for making sand covered with bentonite, the sand, and a method for recycling molding sand for a mold using the sand covered by bentonite
7 6554049 Process for recovering sand and bentonite clay used in a foundry
8 6495511 Process for treating bentonite and products thereof
9 6399544 High solids bentonite slurries and method for preparing same
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11 6175055 Bentonite as odor control material
12 6103245 Topical barrier composition containing silicone and bentonite
13 6103065 Method for reducing the polymer and bentonite requirement in papermaking
14 5915879 Reducing leakage through sandbag dikes using a bentonite or other clay mud slurry
15 5908634 Animal feed containing molasses bentonite and zeolite
16 5883035 Mesoporous silicoaluminate products and production thereof by controlled acid extraction of aluminum from calcium bentonite clay
17 5810971 Liquid slurry of bentonite
18 5810085 Drill hole plugging method utilizing sodium bentonite nodules
19 5798023 Combination of talc-bentonite for deposition control in papermaking processes
20 5775259 Compacted bentonite-based absorbents
21 5657822 Drill hole plugging method utilizing layered sodium bentonite and liquid retaining particles
22 5647300 Compacted bentonite-based absorbents
23 5632575 Method and apparatus for controlled pumping of bentonite around a pipe jacked tunnel
24 5629368 Liquid slurry of bentonite
25 5502267 Organic and metallic waste disposal in bentonite-water mixtures
26 5491248 Readily dispersible bentonite
27 5484834 Liquid slurry of bentonite
28 5451554 Activated carbon bodies having epoxy resin and bentonite binders
29 5391228 Method for preparing high solids bentonite slurries
30 5376609 Activated carbon bodies having bentonite and cellulose fibers
31 5376429 Laminated waterstop using bentonite and bentones
32 5360294 Bentonite liner with drainage system protection
33 5358647 Fabric softening products based on a combination of pentaerythritol compound and bentonite
34 5333673 Metal casting in a sand mold having a sodium bentonite clay binder mixture
35 5322581 Join in the overlapped zone of needle punched bentonite sealing sheets
36 5292908 Modified bentonite
37 5275114 Sodium bentonite clay binder mixture for the metal casting industry
38 5248641 Process for producing bentonite clays exhibiting enhanced solution viscosity properties
39 5163562 Process for reclaiming bentonite and carbon particles from used foundry sand
40 5106418 Process for preparing improved binding material systems, its use for coal-dust-free refining, for moulding of bentonite bindings and for mould-core-formation
41 5080820 Spray dried base beads for detergent compositions containing zeolite, bentonite and polyphosphate
42 5073281 Pelletized rice hull ash and bentonite clay insulation
43 5024778 Spray dried base beads for detergent compositions containing zeolite, bentonite and polyphosphate
44 4952240 Scratch remover and polish containing oleic diethanolamide, an abrasive alumina and a bentonite
45 4882076 Fabric softening and antistatic particulate wash cycle laundry additive containing cationic/anionic surfactant complex on bentonite
46 4861378 Cement additive containing superplasticizer and bentonite
47 4851137 Process for manufacturing bentonite agglomerates
48 4810573 Self-healing bentonite sheet material composite article
49 4787780 Method of waterproofing with a self-healing bentonite sheet material composite article
50 4786422 Fabric softening and antistatic particulate wash cycle laundry additive containing cationic/anionic surfactant complex on bentonite

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