A stabilization process for an arsenic solution comprising thiosulfates, the process comprising: acidifying the arsenic solution to decompose the thiosulfates, to yield an acidified solution; oxidizing the acidified solution to oxidize residual As.sup.3+ to As.sup.5+ and reduced sulfur species to sulfates, to yield a slurry comprising elemental sulfur; separating elemental sulfur from the slurry to yield a liquid; oxidizing the liquid to oxidize residual reduced sulfur species, to yield an oxidized solution; and forming a stable arsenic compound from the oxidized solution.

This invention relates to use of a water-miscible polyhydric alcohol having two or three hydroxyl groups for improving the collector performance of a collector composition for the reverse iron ore flotation comprising at least one alkyl ether amine of formula (I) and/or alkyl ether diamine of formula (II)

R.sup.1—(O-A)-NH.sub.2  (I)

R.sup.2—(O-A)-NH—R.sup.3—NH.sub.2  (II)

wherein
R.sup.1 is a hydrocarbyl group with 6 to 24 carbon atoms,
R.sup.2 is a hydrocarbyl group with 6 to 24 carbon atoms,
R.sup.3 is an aliphatic hydrocarbyl group with 2 to 4 carbon atoms
A is an alkylene group with 2 to 6 carbon atoms.

A method and enhancements for the decontamination of water containing one or more PFAS contaminants includes introducing a foaming agent into the water, and injecting a gas through a diffuser and into the water so as to form a plurality of bubbles in the water, the one or more PFAS contaminants accumulating on the plurality of bubbles. The plurality of bubbles is allowed to rise, forming a foam at the surface of the water. The resulting foam is then collected and transported away from the surface of the water, where it condenses into a liquid and is treated to regulatory standards.

The present disclosure relates to a method for recovering gold in a cyanide tailing by hierarchical ramified flotation. The present disclosure divides a cyanide tailing into coarse and fine-grained products through screen classification, making preparation for hierarchical ramified flotation. The present disclosure then conducts flotation of the coarse and fine-grained products with suitable process parameters and reagent systems, and selects a suitable coarse-grained flotation product as a carrier of fine-grained flotation to maximize the recovery efficiency of fine grains. The present disclosure improves the overall recovery rate of gold with the hierarchical ramified flotation of coarse and fine grains, series-carrier flotation and combined reagent enhanced flotation. The present disclosure has an advanced process, a good separation effect, and can effectively recover fine-grained gold in the cyanide tailing.

Improved sparge compositions for froth flotation separation, methods of using them, and uses thereof are described. The compositions are suitably used in the froth flotation of particulate material containing ultrafine particles, and are well suited to the froth flotation separation of finely comminuted poor (low-grade) ores. The sparge compositions comprise functionalized silicone containing functionality that is tailored to the chemical nature of a beneficiary or a gangue in the ore. Sparging of the compositions effects improved recoveries and purities of beneficiaries. Sparge compositions and functionalized silicones suitable for the froth flotation of iron ores containing silica and/or silicate impurities are described. Sparge compositions and functionalized silicones suitable for the froth flotation of ores containing sulfur compounds such as sulfides are also disclosed.

Processes for macroscopically separating a maceral concentrate from raw coal are disclosed. In some embodiments, a process includes the following steps: crushing and sieving the raw coal to obtain a first coal sample and a second coal sample; subjecting the first coal sample to a heavy medium cyclone separation process; and subjecting the second coal sample to a froth flotation process. The first coal sample has a particle size within a first particle size range, and the second coal sample has a particle size within a second particle size range. In other embodiments, the froth flotation process uses a froth flotation agent including a foaming agent and a collector. The foaming agent includes at least one item selected from the group consisting of 2-octanol, terpenic oil, and polyethylene glycol (PEG). The collector includes at least one item selected from the group consisting of kerosene, diethyl phthalate (BET), and diesel.

The present invention provides improved methods for purifying and/or removing multiply charged cations and suspended solids from water. In particular the process relates to an additive composition that has the appropriate surfactant characteristics for effectively removing multiply charged cations and suspended solids from an aqueous or oil/aqueous mixed phase via foam fractionation. According to the invention, a hydrophobically modified polymer that acts as an associative thickener is used in the presence of a source of alkalinity or anionic reactant as well as surfactant in appropriate ratios to facilitate multiply charged cation and suspended solids removal for water purification in any of a number of commercial, environmental and industrial applications.

Processes for macroscopically separating a maceral concentrate from raw coal are disclosed. In some embodiments, a process includes the following steps: crushing and sieving the raw coal to obtain a first coal sample and a second coal sample; subjecting the first coal sample to a heavy medium cyclone separation process; and subjecting the second coal sample to a froth flotation process. The first coal sample has a particle size within a first particle size range, and the second coal sample has a particle size within a second particle size range. In other embodiments, the froth flotation process uses a froth flotation agent including a foaming agent and a collector. The foaming agent includes at least one item selected from the group consisting of 2-octanol, terpenic oil, and polyethylene glycol (PEG). The collector includes at least one item selected from the group consisting of kerosene, diethyl phthalate (BET), and diesel.

Frother composition and method of concentrating minerals by flotation. The method comprises providing an aqueous slurry formed by the minerals in finely divided form in water; optionally adding a collector to render the mineral hydrophobic; subjecting the slurry thus obtained to flotation in a flotation cell aerated to form bubbles; and recovering the hydrophobic mineral particles together with the froth to form a concentrate. In the method an amphiphilic cellulose derivative, such as and a second surfactant as a frother to promote the formation of a stable froth on top of the slurry in the flotation cell. Hydroxypropyl methyl cellulose or hydroxyethyl methyl cellulose are combined with at least one non-ionic organic surfactant or polyglycol esters, for providing a frother. The novel cellulose-based frothers can be used in mineral processing plants to allow for processing of larger quantities of minerals without significant modification of existing facilities.

The object of this invention is to provide a method of mineral flotation using bioreagents extracted from Gram positive bacteria Rhodococcus opacus and Rhodococcus erythropolis. In this sense, mineral floatability was evaluated using bioreagent extracted from Gram positive bacteria to determine its potential as an alternative to synthetic reagents and also an alternative to the use of microorganisms themselves (biomass).