Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1994-04-01
1995-06-13
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
249 83, 249 91, 249119, 264279, 2642791, 264DIG69, B28B 724
Patent
active
054240247
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to apparatus for storing substances which have to be mixed prior to storage.
Some industrial processes produce by-products which cannot be disposed of by simple tipping or burning, because such action may result in damage to the environment and/or to life forms in close proximity to the tipped or burned substances.
BACKGROUND OF THE INVENTION
A common manner of disposal of such substances as those generally referred to hereinbefore, is to put them in metal drums, along with a solidifying agent such as cement and, after curing of the whole, transporting them in metal, rectangular containers, to the storage site and burying everything in a specially prepared concrete container, which has already been prepared in the burying area.
The process is ongoing, and consequently space is at a premium. However, the drums presently used are cylindrical and when a number of them are arranged in side-by-side touching relationships, spaces are defined between them. This generates two problems. One is lost storage space in a given volume containing the drums. The other is a danger that in the event of long term corrosion of the containing structure, the substance (normally the ground) in which the whole is buried, might sink into those spaces, as well as into cavities which form as a result of the corrosion.
Both lost storage volume and the sinking ground can be alleviated by the use of square metal drums, rather than round ones. Such drums however, are more costly relative to the circular ones, which normally are reclaimed oil drums. Moreover, it is vital to product quality that thorough mixing of the by-product with the solidifying agent is achieved, but the said mixing is difficult to achieve in the corners of a square receptacle, by any process. Steps presently taken with round drums includes filling the spaces between them with grout before infilling the burial chamber properly. This is also a time consuming process, and consequently expensive.
SUMMARY OF THE INVENTION
The invention seeks to provide an improved apparatus in which to mix and solidify waste products and a solidifying agent, so as to facilitate both thorough mixing and full utilisation of available storage space.
According to one aspect of the present invention apparatus for preparing a hardenable substance for storage comprises, in combination, a waterproof flexible bag, a skeletal frame which for use is inserted in the bag so as to enable said bag to be drawn about the frame so as to adopt its shape, which shape in use is effectively nearly circular or is substantially circular, clips for retaining the bag on the frame and a rectangular mould the interior length of which is a multiple of its interior width and the skeletal frame is proportioned so as to fit in engagement with the interior sides of the mould and to extend lengthwise thereof a distance equal to its interior width, and for use the skeletal frame is inserted in the bag which is drawn thereabout and held by clips and the whole is placed in the mould with other, identical bagged frames for the full interior length thereof.
According to a further aspect of the present invention a method of preparing a hardenable substance for storage comprises the steps of inserting a skeletal frame in a flexible, waterproof bag, drawing the bag about the frame so as to adopt its shape, which shape in use is effectively nearly circular or substantially circular, retaining the bag on the frame by clips, placing the bagged frame along with other, identical bagged frames in a rectangular mould which is so proportioned as to be engaged via its side and end walls with respective bagged frames, filling each bag with a waste product, water and hardening agent, stirring the mixes to achieve a substantially even dispersion of the waste material and the hardening agent and then removing the clips so as to enable the now viscous mixes to settle and so force the walls of their respective bags against each other and the walls of the mould, to be constrained there
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Bennett John C.
Saul David
Aftergut Karen
Northern Engineering Industries plc
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