A method for treating sulphate-bearing wastewater that recovers and recycles aluminium trihydroxide used in ettringite precipitation. The method selectively dissolves a portion of ettringite to generate aluminium sulphate, which is used to regenerate aluminium trihydroxide from remaining ettringite. Gypsum containing entrained aluminium trihydroxide is recycled for further aluminium recovery.
An apparatus and system for automatically determining the particle size distribution of a sample, such as an ore concentrate. The apparatus includes a vertically movable frame, actuator, and at least one load cell for measuring the weight of sieves in a stack before and after sample processing. The sieves are configured to be lifted and separated for individual weighing. A controller determines the particle size distribution based on the weight difference and known density. The sieves are adapted for automated handling and include fluid apertures and a closable discharge opening.
UNIVERSITY OF THE WITWATERSRAND, JOHANNESBURG (South Africa)
MINTEK (South Africa)
Inventor
Moloto, Nosipho
Shumbula, Ndivhuwo
Ndala, Zakhele
Mente, Pumza
Mofokeng, Thapelo
Nkabinde, Siyabonga Sipho
Mlambo, Mbuso
Tetyana, Phumlani
Jengele-Tetyana, Zikhona
Abstract
The invention relates to wound dressings in the form of tissue scaffolds, gels and powders. The wound dressing comprising at least one polymer material and a coating agent coating the at least one polymer material, wherein the wound dressing is incorporated with an effective amount of an antimicrobial agent. The invention also extends to methods of making the wound dressings and also extends to wound dressings produced in accordance with the methods of the invention.
A binder for use in leaching a heap of a low-permeability ore containing at least one of the following: copper ore, copper/cobalt ore, nickel laterite ore and uranium ore, wherein the binder comprises an acid-proof cement formed by modifying ordinary Portland cement (OPC) with a supplementary cementitious material (SCM).
A method of treating a sulphate-bearing stream which includes the steps of hydrolysing aluminium sulphate to produce a chemically-reactive aluminium trihydroxide and sulphuric acid, adding lime to immobilize the sulphuric acid as gypsum and using the aluminium trihydroxide to remove sulphate from the sulphate-bearing stream without interference of sulphate derived from the aluminium sulphate used as an aluminium source in the hydrolysis step.
A method to improve the solid/solid separation of an amorphous aluminium trihydroxide containing suspension from a gypsum containing suspension in a saturated calcium sulphate solution without the need for a dewatering step following the solid-solid separation.
C02F 1/52 - Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
B07B 13/04 - Grading or sorting solid materials by dry methods, not otherwise provided forSorting articles otherwise than by indirectly controlled devices according to size
C02F 1/66 - Treatment of water, waste water, or sewage by neutralisationTreatment of water, waste water, or sewage pH adjustment
A binder for use in leaching a heap of a low-permeability ore containing at least one of the following: copper ore, copper / cobalt ore, nickel laterite ore and uranium ore, wherein the binder comprises an acid-proof cement formed by modifying ordinary Portland cement (OPC) with a supplementary cementitious material (SCM).
C04B 28/00 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
A froth flotation apparatus including a tank defining an interior, for holding a slurry, an aerator for aerating a mineral feed stream entering the interior and a system for feeding the aerated mineral stream into a contactor located in the tank.
A method to improve the solid/solid separation of an amorphous aluminium trihydroxide containing suspension from a gypsum containing suspension in a saturated calcium sulphate solution without the need for a dewatering step following the solid-solid separation.
A method to improve the solid/solid separation of an amorphous aluminium trihydroxide containing suspension from a gypsum containing suspension in a saturated calcium sulphate solution without the need for a dewatering step following the solid-solid separation.
A method of treating a sulphate-bearing stream which includes the steps of hydrolysing aluminium sulphate to produce a chemically-reactive aluminium trihydroxide and sulphuric acid, adding lime to immobilize the sulphuric acid as gypsum and using the aluminium trihydroxide to remove sulphate from the sulphate-bearing stream without interference of sulphate derived from the aluminium sulphate used as an aluminium source in the hydrolysis step.
A method of treating a sulphate-bearing stream which includes the steps of hydrolysing aluminium sulphate to produce a chemically-reactive aluminium trihydroxide and sulphuric acid, adding lime to immobilize the sulphuric acid as gypsum and using the aluminium trihydroxide to remove sulphate from the sulphate-bearing stream without interference of sulphate derived from the aluminium sulphate used as an aluminium source in the hydrolysis step.
The invention relates to a composite material, suitable for treating water. The composite material comprises an active layer and a substrate layer, with the active layer including titanium dioxide and silver nanoparticles. The active layer is bonded to the substrate layer such that, in use, there is substantially no leaching of the active layer into the body of water. The invention further relates to a method of preparing the composite material.
B01J 20/06 - Solid sorbent compositions or filter aid compositionsSorbents for chromatographyProcesses for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group
B01J 20/02 - Solid sorbent compositions or filter aid compositionsSorbents for chromatographyProcesses for preparing, regenerating or reactivating thereof comprising inorganic material
B01J 20/28 - Solid sorbent compositions or filter aid compositionsSorbents for chromatographyProcesses for preparing, regenerating or reactivating thereof characterised by their form or physical properties
A froth flotation apparatus including a tank defining an interior, for holding a slurry, an aerator for aerating a mineral feed stream entering the interior and a system for feeding the aerated mineral stream into a contactor located in the tank.
A froth flotation apparatus including a tank defining an interior, for holding a slurry, an aerator for aerating a mineral feed stream entering the interior and a system for feeding the aerated mineral stream into a contactor located in the tank.
A process for the production of high carbon ferromanganese which includes; the step of smelting carbon-based manganese ore micro-pellets in a smelting furnace in a shallow burden configuration.
A method of processing an iron-rich rare earth bearing ore which includes the steps of smelting the ore to concentrate rare earth oxide minerals in the ore into a slag phase and extracting the rare earth oxide minerals from the slag.
C22B 5/10 - Dry processes by solid carbonaceous reducing agents
C22B 9/10 - General processes of refining or remelting of metalsApparatus for electroslag or arc remelting of metals with refining or fluxing agentsUse of materials therefor
19.
Effluent treatment process—pH refinement for sulphate removal
Disclosed is a method of decomposing ettringite, to form amorphous aluminium trihydroxide, which includes the step of lowering a pH of a slurry containing ettringite to a value between 8 and 8.5.
Disclosed is an acid waste water treatment and method wherein heavy metal hydroxides and gypsum are precipitated in a single operation and wherein amorphous aluminium trihydroxide and gypsum are separated in a single solid-solid separation unit.
A method of purifying a value metal-containing solution by dividing the solution into a major stream and, at least, two minor split streams, treating each minor split stream with a respective reagent to form a respective value-metal containing precipitate, treating the major stream with each value metal-containing precipitate to form an impurity-containing precipitate and a partially purified value metal-containing stream, and recovering the partially purified value metal-containing stream by means of a solid liquid separation step.
A spiral separator in which the position of an interface zone between adjacent bands of slurry, relative to a splitter, is adjusted by directing a jet of a pressurized fluid onto a surface of the slurry, upstream of the splitter.
B03B 5/04 - Washing granular, powdered or lumpy materialsWet separating using shaken, pulsated or stirred beds as the principal means of separation on shaking tables
B03B 5/62 - Washing granular, powdered or lumpy materialsWet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
A spiral separator in which the position of an interface zone between adjacent bands of slurry, relative to a splitter, is adjusted by directing a jet of a pressurized fluid onto a surface of the slurry, upstream of the splitter.
B03B 5/62 - Washing granular, powdered or lumpy materialsWet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
B03B 5/04 - Washing granular, powdered or lumpy materialsWet separating using shaken, pulsated or stirred beds as the principal means of separation on shaking tables
A method of processing an iron-rich rare earth bearing ore which includes the steps of smelting the ore to concentrate rare earth oxide minerals in the ore into a slag phase and extracting the rare earth oxide minerals from the slag.
A method of recovering rare earth oxide mineral from an iron-rich rare earth- bearing ore which includes the steps of subjecting a solidified and milled slag to a hydrochloric leach, the slag having been produced in a carbothermic smelting step during which iron and manganese oxides in the ore were reduced and precipitated into a metal phase as low manganese pig iron and wherein optimum molten slag properties were regulated by controlling a level of iron oxide in the slag.
A method of processing a ferroalloy waste slag in a reactor which includes the steps of treating the slag with a metallic reductant and a conditioning flux to release a metal oxide and reduce it to metallic form, to use as a commercially acceptable silicon-containing alloy and to form a waste slag which is detoxified by means of granulation and separating the detoxified slag from silicon-containing alloy particles.
A method of preparing a pre-reduced ilmenite ore for smelting, wherein metal oxides contained in the ore are selectively reduced in solid-state reactions over titanium oxide, the method including the step of pre-reducing carbon-based pellets of the ore.
A method of preparing a pre-reduced ilmenite ore for smelting, wherein metal oxides contained in the ore are selectively reduced in solid-state reactions over titanium oxide, the method including the step of pre-reducing carbon-based pellets of the ore.
A simplified acid water treatment and method wherein heavy metal hydroxides and gypsum are precipitated in a single operation, thereby eliminating a reactor unit and a solid-liquid separation unit which includes the steps of raising the pH of the waste water, precipitating heavy metal hydroxides and gypsum in a single operation, adding amorphous aluminium trihydroxide in order to precipitate ettringite, removing the precipitated ettringite in the form of an ettringite-containing slurry by using a liquid/solid separation step, lowering the pH of the ettringite-containing to form recovered amorphous aluminium trihydroxide and gypsum and separating amorphous aluminium trihydroxide and gypsum in a single solid-solid separation unit.Date Recue/Date Received 2021-04-07
A method of decomposing ettringite, to form amorphous aluminium trihydroxide, which includes the step of lowering a pH of a slurry containing ettringite to a value between 8 and 8.5
An acid waste water treatment and method wherein heavy metal hydroxides and gypsum are precipitated in a single operation and wherein amorphous aluminium trihydroxide and gypsum are separated in a single solid-solid separation unit.
A method of decomposing ettringite, to form amorphous aluminium trihydroxide, which includes the step of lowering a pH of a slurry containing ettringite to a value between 8 and 8.5
A method of recovering gold from carbon fines in a resin-in-leach process wherein the fines are contacted with an ion exchange resin, in the presence of a suitable lixiviant, to load gold onto the resin, eluting the gold from the resin using a suitable eluent and recovering the gold from a resulting eluate.
A method of recovering gold from carbon fines in a resin-in-leach process wherein the fines are contacted with an ion exchange resin, in the presence of a suitable lixiviant, to load gold onto the resin, eluting the gold from the resin using a suitable eluent and recovering the gold from a resulting eluate.
A chrome product by smelting a feed material which contains a chromite ore under conditions in which gangue, in the feed, provides the flux for the chrome product.
C22B 9/10 - General processes of refining or remelting of metalsApparatus for electroslag or arc remelting of metals with refining or fluxing agentsUse of materials therefor
A method of detecting an open arc in a DC plasma arc furnace which is based on detecting a linear decrease in the log of the magnitude of the frequency spectrum of the voltage between the anode and cathode.
F27B 3/08 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces heated electrically, e.g. electric arc furnaces, with or without any other source of heat
F27B 3/28 - Arrangement of controlling, monitoring, alarm or like devices
A method of detecting an open arc in a DC plasma arc furnace which is based on detecting a linear decrease in the log of the magnitude of the frequency spectrum of the voltage between the anode and cathode.
G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
F27B 3/08 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces heated electrically, e.g. electric arc furnaces, with or without any other source of heat
F27B 3/28 - Arrangement of controlling, monitoring, alarm or like devices
F27D 17/00 - Arrangements for using waste heatArrangements for using, or disposing of, waste gases
A mixer settler which includes at least first and second horizontally disposed units wherein a transfer duct transfers fluid at an increased velocity from the first unit to the second unit.
A diagnostic probe or chemical sensor includes a solid substrate or support material carrying copper-gold alloy nanoparticles. The probe or sensor is particularly suitable for sensing the presence of ascorbic acid and a method of detecting ascorbic acid in a sample is thus also disclosed. The invention extends to a method of manufacturing a diagnostic probe or chemical sensor which includes forming a liquid admixture that includes copper-gold alloy nanoparticles and a substrate or support material, and solidifying the liquid, nanoparticle-containing admixture into a solid body.
B82Y 15/00 - Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
D01D 5/00 - Formation of filaments, threads, or the like
G01N 27/12 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluidInvestigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon reaction with a fluid
G01N 33/52 - Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper
G01N 21/78 - Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
G01N 33/58 - Chemical analysis of biological material, e.g. blood, urineTesting involving biospecific ligand binding methodsImmunological testing involving labelled substances
G01N 33/82 - Chemical analysis of biological material, e.g. blood, urineTesting involving biospecific ligand binding methodsImmunological testing involving vitamins
In a submerged arc furnace deviation of a current path is detected by identifying a variation of a parameter of a magnetic field generated by current flow in the furnace.
Mixer settler apparatus which includes a vertical column which is divided by a plurality of horizontal plates into a plurality of fluid-containing volumes, wherein each plate has a transfer duct to induce turbulence in a respective lower fluid-containing volume.
A composite metallophthalocyanine polymer material comprises lutetium(lll) phthalocyanine supported on a polymer support. The material can be synthesised by a process which includes forming a solution of a lutetium(lll) phthalocyanine and a polymer in a solvent, and electro-spinning the solution to form fibers of the composite metallophthalocyanine polymer material.
A PGM is identified by subjecting a sample mineral to a scanning electron microscope to produce an energy dispersive spectrum for the sample and comprising the amplitude of the spectrum in a single channel to data from a reference table of normalised spectra of different PGM species.
G01N 23/225 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by measuring secondary emission from the material using electron or ion microprobes
45.
A SUBSTANCE OR COMPOSITION FOR THE TREATMENT OF CANCER
The invention provides a phosphine complex of the general formula (I) in which M is Pt or Pd; R 1 and R 2 are independently Ph, 2-pyridyl, 3-pyridyl or 4-pyridyl; the two Y substituents are independently CH 2 CH 2 or CH=CH; and X is hexafluorophosphate, halogen or pseudo-halogen. The phosphine complex is useful in the treatment of cancer.
Liquid metal is continuously recovered by condensing metal vapour in a sealed system, more or less at atmospheric pressure, and collecting liquid metal in a crucible. The contents of the crucible are agitated and the temperature is controlled to prevent the liquid metal from solidifying. Liquid metal and dross are tapped from the crucible.
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
(1) Material treatment services, namely, the treatment of metallurgical waste material to form or produce slag, that can be disposed of in an environmentally friendly manner and, where economically viable, to recover alloy/metal by reduction/condensation for sale.
