IL35388A

IL35388A - Absorbing substances for the removal from water of organicwaterimmiscible polluting liquids and their production

Info

Publication number: IL35388A
Application number: IL35388A
Authority: IL
Original assignee: Immobiliare Sette Srl Latisana
Priority date: 1969-10-16
Filing date: 1970-10-05
Publication date: 1974-07-31
Also published as: DE2051435A1; NL7015146A; FR2065206A5; OA03498A; BE757527A; GB1330851A; IL35388A0; ES384616A1

Description

Absorbing substances for the from water of organic polluting liquids and their production The invention relates to substances for the removal by absorption of polluting liquids from water in which they are A substance according to the invention comprises a obsidian or or a slag from steel which has been heat and where appropriate to yield a product having a density less than that of water and a pore space amounting to at least of its Substances according to the invention find particular application for the removal of mineral oils from water following leakage from water crafts or submarine or in consequence of storage or treatmen this way shore areas can again be rendered suitabl for fishing or The invention includes a process for the removal of polluting liquid from water which comprises spreading a substance according to the invention on the Substances according to the invention may be in grain powder In some particular for instance lakes or closed it may be advantageous that the absorbent substance according to the invention does not sink after having absorbed the liquid but floats on the surface and can be collected without accumulation on the Alternatively it may be preferred that after absorbing the pollution liquid the substance The desired properties are achieved by controlling the Substances according to the invention may be placed in containers which are permeable to Thus they form filter bodies having thickness and and floating on the water surface or take up fixed positions Such filter bodies can be used for the purification of the polluted water at an outlet or along a canalization of waste liquids from industry or of sewer Provision may also be made the supply or renewal of the absorbent the containers by a continuous or discontinuous process according to an open or closed Absorbent substances can be made by heat and where appropriate milling classification according to grain size of lightweight such as is obtained from natural bodies or more compact Of the other obsidians and are spherdi or laminar are The treatment may be carried out in a at from to according to the nature and of the starting material and the expansion which is Such treatment considerably modifies the structure of the more compact vermiculites and transforms them into products having appropriate apparent density and other The heat treatment may be regulated so to obtain a more expanded product according to the invention where the percentage of the pore spaces corresponds to at least the of the volume and the apparent does not exceed The de ree of millin also ma be ad usted sink after having absorbed the polluting particle size should not in general be lower than so that inside the grains there are closed spaces containing air and to give to the product the desired degree of Absorbent substances according to the invention may be further treated in order to make them water Such treatment may be carried out at a pressure equal to or lower than atmospheric and at a temperature which depends upon the physicochemical properties of the starting material of the hydrophobilizing fe hydrophobilizing solution can be such as to be able to give to the absorbent substance both and capacity of absorbing one or more pollution Either the specific absorption capacity can be to an already hydrophobilized absorbent substance by treatment with an activating solution or the sequence of treatments can be The hydrophobilizing treatment can be partially carried out eo that only a part of the inner spaces of the grains is filled with water when the absorbent substance is In this way the degree of buoyancy and the absorption capacity of the substance can be An exemplary process the production of absorbent substances according to the invention first feeding lightweight pumice having a high degree of a pumice having pore space amounting to at least of its volume and an apparent density lower than that of the and the milling and classifying as to particle Materials which their nature are or only slightly porous after the second step can be fed into a preferably a rotary under an air at from about to about according to the nature and density of the to be treated and to the desired expansion In some cases to postpone milling and classification as to particle size until after heat treatment may prove The product treated in the or the naturally porous which has been and is fed into a unit wherein and optionally the activation of the absorption capacity of the product with regard of one or more of the polluting liquids can take Selectivity of the absorbing capacity of absorbent substances according to invention be obtained either the using a single solution adapted to the materials or them hydrorepellant and selectively able to absorb one or more polluting or in or more In this latter case the materials are brought into contact with solutions which are different according to the character the polluting liquid to be Such solutions may also contain different colours to characterise different product and their specific field of From the hydrop which can comprise one or more there may branch off a closed circuit a unit in which activating solution is prepared a unit in which solvent is to obtain hydropho and activatio of the absorbency of the produc to specific pollution liquids can be carried out by of a solution inoffensive to aquatical flora and for a silicone or a of polyvinyl or a metal salt for example an aluminium salt Such solutions make it possible to achieve a homogenous distribution of the solvent on the outer surfaces of the absorbent substance as well as on the inner spaces which do not form part of the porous amount of the component or and of the activators designed to activate the absorption which deposits in this way should not substantially increase the apparent density of absorbent The particle size of the absorbent substance used depends upon the turbulence of the water to be upon the water density and upon the density of the polluting Mixtures of absorbent substances of different particle also be The transport and distribution of the absorbent substances can be performed using or Wo special is As the absorbent substances are water repellent it is possible to spread them on or deposit them in containers made of or soluble materials thrown or left in an area liable to insufficientOCRQuality

Claims

1. A substance for the absorption of a non-miscible polluting liquid from water, which substance comprises pumice, a pea lite, obsidian or vermiculite, or a slag from steel production, which has been heat treated, and where appropriate milled, to yield a produet having a density less than that of water and a pore space amounting to at least 50 of its volume.

2. A substance according to Claim 1 having an absorption capacity for the polluting liquid such that after absorbing pollution liquid from the water the substance sinks.

3. A substance according to Claim 1 or Claim 2 having a pore space amounting to at least 85 of its volume and an apparent density lower than 0.3 g/ml.

4. A substance for the removal of a non-miscible polluting liquid from water as herein described.

5. A process for the absorption of a non-miscible polluting liquid from water which comprises spreading on the surface of the water a substance according to any of claims 1 to 4.

6. A process according to Claim 5 as herein described. For the Applicants HB:PS