EP0403244A1
Expired / Lapsed
EP
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Water treatment process
Assignee: BUXTON LIME INDUSTRIES Ltd
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Filing: 1990-06-13
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Granted: —
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Expires: 2010-06-13
Abstract
Abstract Acid water containing toxic levels (> 0.1 ppm) of aluminium is treated to dissolve therein both silicate ions in an amount to create a solution containing at least 40, preferably at least 100, micromoles per litre of silicon and a silicon:aluminium ratio (based on metals) of at least about 6:1 and preferably 10:1 in the water to form a non-toxic complex with aluminium and alkali or alkali metal ions to increase the pH of the water. The preferred treatment agent is a hydraulic calcium silicate, in the form of cement clinker, optionally silicate-enriched with a soluble silicate.
Inventors
- 👤 James Derek Birchall
- 👤 Michael John Walker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 18:00
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/66; C02F1/58; C02F1/52; C02F1/5236
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
A process for the detoxification of waters containing dissolved aluminium which comprises dissolving in the water a source of silicon and a source of alkali in amounts such that the water contains at least 40 micromoles per litre of dissolved silicon and the ratio of silicon to aluminium in the water is greater than 6:1.
Claim 2
Dependent Claim
55 words
A process for the detoxification of waters containing dissolved aluminium which comprises dissolving in the water a source of silicon and a source of alkali in amounts such that the water contains at least 40 micromoles per litre of dissolved silicon and the ratio of silicon to aluminium in the water is greater than 6:1.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1 wherein the amount of dissolved silicon in the water is at least 100 micromoles per litre.
Claim 4
Dependent Claim
24 words
A process as claimed in claim 1 or claim 2 wherein the ratio of silicon to aluminium in the water is greater than 10:1.
Claim 5
Dependent Claim
19 words
A process as claimed in 1, 2 or 3 wherein a common source of silicon and alkali is employed.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 4 wherein the common source of silicon and alkali is a hydraulic calcium silicate.
Claim 7
Dependent Claim
16 words
A process as claimed in claim 5 wherein the hydraulic calcium silicate is a cement climber.
Claim 8
Dependent Claim
15 words
A process as claimed in claim 5 wherein the hydraulic calcium silicate is Portland cement.
Claim 9
Dependent Claim
20 words
A process as claimed in any one of claims 4 to 7 wherein an additional source of silicon is employed.
Claim 10
Dependent Claim
24 words
A process as claimed in any one of claims 5 to 8 wherein a setting inhibiting additive is mixed with the hydraulic calcium silicate.
Claim 11
Dependent Claim
13 words
A process as claimed in claim 9 wherein the additive is a sugar.
References Cited (Backward Citations)
DE886130C
Cited
US4664809A
Cited
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