TECHNOLOGY FOR STONE WASTE UTILISATION

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TECHNOLOGY FOR STONE WASTE UTILISATION

• By
• Dr. S. S. Rathore
• Head of Mining Engineering Department
• College of Technology and Engineering
• Maharana Pratap University of Agriculture and
  Technology Udaipur, India

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TWO MAIN TYPES OF WASTE
B) Muds produced by sawing and polishing
operations on slabs

• Small shapeless blocks deriving by cutting and
  sawing of stone

Air dried filter-pressed mud
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A) Small shapeless blocks deriving by cutting and
sawing of stone
Re-used in the building industry as inert matter,
aggregate in concretes and, as a function of its
mineralogical composition, as raw material for
other industrial processes.
Discards from calcareous rocks with a suitable
calcite content can be used to produce binders,
or as weak abrasive agents
Discards from silicate-rich rocks (granitoid
rocks) to produce, after beneficiation process,
quartz-feldsphatic sands for the ceramic industry.
Or.
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B) Muds produced by sawing and polishing
operations on slabs
Obtained after sawing and polishing processes it
is made up by fine grain size material produced
by the rock mixed with the tool cooling water.
Suitable processes allow to extract the solid
portion.
Two possible destinations
2) Recovery of the waste for possible
technological applications as a function of its
features

• Landfill disposal as non-dangerous special waste

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Necessary if we consider that sawing operations
carried out with frames or diamond disks may
determine an increase in the waste of heavy metals
Cr, Ni, Cu, Mn, Fe
Co, Cu
If leaching tests provide values higher than
those admittable, it is necessary to separate the
metal fraction from the wastes. It was found out
that this kind of separation can give
satisfactorily results as far as Co is considered
.details in the next presentation
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Landfill disposal cost
transportation
Purchase and management of filter press
Overall evaluation Rs. 1-2 per kg of mud As a
function of factors such as the type of plan,
distance from the landfill, regional market, etc.
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Recovery of the waste, on the basis of their
mineralogical and chemical features, for
different and compatible uses
MUDS deriving from sawing of
STONES, MARBLE, SLATES
GRANITES
Features of the waste muds bearing at least 85
of calcium carbonate on dry matter.
Features of the waste filter pressed muds
bearing more than 50 of silicates
Recovery activity dehydration, drying, sieving,
grinding, micronizing
Recovery activity dehydration, drying, sieving,
grinding, micronizing, compacting and
deironization
a) Paper industry b) Production of
hydropaintings c) Neutralization of acid
wastes d) Reagent for desulphuration of
combustion smokes
a) Brick industry as material added to the
mixture (not higher than 5 of dry
matter) b) ceramic industry
Common to both
-) Cement industry -) Road subfloor (recover
subordinate to the fulfillment of leaching tests
on the untreated waste according to a normalized
method) -) Environmental restorations (recover
subordinate to the fulfillment of leaching tests
on the untreated waste according to a normalized
method) -) As blanketing material for urban
solid waste landfill disposal areas (recovery
subordinate to the fulfillment of leaching tests
on the untreated waste according to a normalized
method)
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Treated or untreated wastes, if admitted for a
reuse, can be destined for technological
applications in

• Pedotechnical uses

- building industry
Lightweigth Expanded Aggregates
Lightweight concretes
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In both directions the research was addressed in
order to verify if it was possible to give an
innovative contribution to this aspect
- building industry
Lightweight concretes
Lightweigth Expanded Aggregates
Previous experiences on the use of these wastes
for the production of LEAs
Wastes deriving from sawing and polishing
operations may contain expanding agents
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In particular, those showing a silicatic
composition (GRANITE s.l.) can definitely give
Lightweight expanded aggregates (LEAs) once
properly mixed with other industrial wastes
bearing expanding agents
Dry mud from granite-type rocks
LEAs


industrial wastes bearing expanding agents (i.e.
abrasive SiC )
DOUBLE ADVANTAGE
Reuse of two different wastes
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PEDOTECHNICAL USES
1) USE OF SILICATE BEARING WASTES AS POTASSIC
FERTILIZERS For soils characterized by a low
content of nutritional elements
2) USE OF SILICATE BEARING WASTES AS
ENVIRONMENTAL RECOMPOSITION To produce
artificial proto-horizons as substrate for plants
3) USE OF CARBONATE BEARING WASTES AS AMENDANT OF
ACID SOILS Scale models in confined environments
on soils with acid reaction (pHlt5.5)
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Waste recovery from ornamental stone industry
Muds
Unshaped small blocks
Lightweigth Expanded Aggregates
Pedotechnical uses (Plant growth)
Recover of ferrous elements (eventually diamond)
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MoU between IS.I.M, Italy and M/s R.K. Marble
MPUAT, Udaipur India

• Objectives of MoU
• To enhance scientific, technical and professional
  contacts and partnership between Italy and India
• To achieve general transfer of know-how and
  advanced technologies from Italy to India through
  training and research activities
• Promote jointly a technical and scientific
  research on diamond wire technologies on
  variable speed diamond wire saw machine and
  single diamond wire block dressing machine

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TWO SCIENTIFIC REEARCH PROJECTS COMPLETED Project
A Study on and test to know the influence of
the peripheral speed on wire life, saw output
etc. in white dolomitic marble stone (Machine
used Make Marini, Italy ) Project B To
know the performance of the new Italian
technology i.e. stationary single diamond wire
block dressing machine
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Comparison of life of diamond wire (consists of
2000 beads) with variable speed machine and
fixed speed machine (Peripheral speed 27 m/s and
Thrust 55-60 amp.)
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Operating cost comparison (Power only) for
dressing block (2.4 m x 1.67 m)
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INTERANTIONAL INDUSTRY PROJECTUNDERTAKEN RECENTLY

• Title of Project
• UTILIZATION OF STONE POWDER OF PROCESSING PLANTS
• Name of Principal Investigators
• Dr. S.S. Rathore, Deptt. Of Mining Engineering,
  MPUAT, Udaipur, India
• and
• Eng. Paolo Marone, IS.I.M.,Napoli, Italy

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RESEARCH TARGET

• Use of powder in Agriculture by making
  experiments with pot culture
• Use of powder in block and brick making
• Use in road filling
• Production of light agreegate

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PROPOSED WORK PLAN

• To procure the necessary granite powder from the
  field to set up the experiments in India and
  Italian University. The selection of the powder
  will be from following possible site
• - The powder from Indian granites after
  polishing/grinding phase.
• - The powder of Indian gang saw plants
  processing of big blocks
• - The powder from Indian granites after steel
  grit gang saw phase.
• Determination of chemical and mineralogical
  properties of the granite powder
• To send of powder of various types to Italian
  University for testing purposes as per directive
  Of Eng Paolo Marone, IS.I.M., Italy
• Setting experiments as pot culture in the
  department of mining engineering with varying the
  percentage of granite and marble and dolomite
  powder in same type of soil. Observation
  periodically under the supervision of scientist
  and contractual research assistant of the
  agriculture field.
• Making blocks with various granite powder ratio
  and to carry out the strength properties of
  blocks and possible uses.

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Thank you