Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1989-01-19
1990-10-30
Lacey, David L.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210734, 209166, 5262922, B03D 1016, B03D 102, C02F 124, C02F 156
Patent
active
049667122
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a flotation collector for use in the separation of inorganic substances from an inorganic substance-containing water system by flotation and to a method for the treatment of an inorganic substance-containing water system by the use of the flotation collector. More specifically, it relates to a flotation collector to be used advantageously, optionally in combination with a frother, for the separation of valuable metals such as copper, lead, zinc, and uranium and valuable minerals such as quartz, mica, fluorite, barite, apatite, and ilmenite or for the recovery of valuable components or removal of unwanted components from plant effluent, sewage, and geothermal water and to a method for the separation, removal, or recovery of inorganic substances from a water system by the use of the flotation collector.
BACKGROUND ART
Heretofore as cationic flotation collectors intended mainly for minerals, hydrochlorides and acetates of such long-chain alkylamines as lauryl amine, tallow amine, and coconut amine have been finding extensive utility.
The flotation collectors (hereinafter referred to briefly as "collectors") based on such long-chain alkylamine salts as mentioned above are deficient in the efficiency for recovery and separation of valuable inorganic substances in the flotation. Particularly, they have a disadvantage that their capacity for performance is greatly impaired by the conditions of flotation such as concentration of co-existing water-soluble inorganic salts, pH and temperature of the water system. The impairment of the capacity for performance is conspicuous when the water system happens to contain water-soluble inorganic salts represented by chlorides, sulfates, carbonates, and phosphates of sodium, potassium, calcium, magnesium, manganese, iron, and aluminum on the order of several thousand ppm. Particularly when the water system subjected to the flotative treatment has a high salt concentration and a high temperature exceeding 70.degree. C like the geothermal water, these collectors effect the recovery only with a low coefficient and can hardly be expected to provide effective flotation. Further, since the long-chain alkylamine salt type collectors have their qualities notably affected by variation in the pH value of the water system, the possible impairment of the capacity is generally precluded by optimizing the pH value of the water system by addition of a pH adjusting agent. This pH adjustment complicates the operation of the flotative treatment and jeopardizes the ease of use of collector.
In the circumstances, the desirability of developing a flotation collector capable of fully manifesting the capacity thereof in effecting flotative recovery and separation at high levels never attained by the conventional collectors even in a water system of high temperature or a water system susceptible of wide pH variation, irrespectively of the amount of water-soluble inorganic salts present in the water system under treatment has been finding recognition.
In recent years, efforts are being continued to promote the utilization of the geothermal water as a stable and clean energy source of lasting reserve. In the utilization of the geothermal water, since the temperature of the geothermal water never fails to fall during the course of the utilization, the inorganic substances, particularly silica, which are retained in a dissolved state in the geothermal water at the initial high temperature are suffered to precipitate in a large amount. These precipitated inorganic substances bring about a serious disadvantage that they are deposited in the form of scale in conduits, heat exchangers, return wells, etc.
To prevent the deposition in the piping of the scale formed mainly of silica (hereinafter referred to as "silica type insoluble component"), various measures are being tried including:
(1) A method which comprises adding an acid to the geothermal water thereby lowering the pH value thereof.
(2) A method which comprises adding a compound of such a polyvalent meta
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Hozumi Yoshiyuki
Matsuura Nobuhiro
Nishibayashi Hideyuki
Urano Yoshiaki
Watanabe Fumio
Lacey David L.
Lithgow Thomas M.
Nippon Shokubai Kagaku Kogyo Kabushiki Kaisha
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