Abstract Concentration of magnesite present in ores containing siliceous and calcareous impurities and having some clay slimes as impurities by first reducing the slimes content of a magnesite ore pulp. cleaning same in a first flotation treatment wherein some of said impurities are separated as a float product, mixing a selected group of depressants for said siliceous and calcareous impurities in predetermined proportions in a liquid carrier, adding the premixed depressants to the cleaned pulp feed to a second flotation treatment at a predetermined rate, and stage adding an emulsifiable tall oil fatty acid collector reagent of low rosin content in starvation amounts at intervals in the progressive pulp flow through the second flotation treatment thereby floating a portion of the total magnesite content at each introduction stage.
Inventors
👤 Tage L B Jepsen
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-08 09:26
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A treatment as defined in claim 1, in which the ore charge taken for treatment is first subjected to a slimes removal treatment, the ore so cleaned is conditioned with depressant reagents for the siliceous and calcareous impurities, and then subjected to the froth flotation at a plurality of stages with the increments of the emulsifiable tall oil fatty acid collector reagent introduced in starvation amounts to said plurality of stages.
Claim 2
Dependent Claim
33 words
A treatment as defined in claim 1, in which the tall oil collector reagent is rendered emulsifiable by a nonionic surfactant by mixing the tall oil collector reagent with a nonionic surfactant composition.
Claim 3
Dependent Claim
22 words
A treatment as defined in claim 1, in which said collector reagent is fed in starvation amounts to said plurality of stages.
Claim 4
Dependent Claim
51 words
A treatment as defined in claim 3, in which the collector reagent rendered emulsifiable by a nonionic surfactant is the product of mixing a tall oil acid of low rosin content in the range of 0-5 percent by weight with a 5-15 percent by weight addition of a nonionic surfactant composition.
Claim 5
Dependent Claim
31 words
A treatment as defined in claim 4, in which the quantity of collector reagent introduced into the plurality of stages is sufficient to float a high-grade magnesite concentrate at each stage.
Claim 6
Dependent Claim
21 words
A treatment as defined in claim 3, in which the surfactant composition is a condensation product of nonylphenol with ethylene oxide.