GB 2592985 A

A method for the manufacture of hydraulic binders from water treatment residuals

(22) 13.03.2020

(43) 15.09.2021

(57) (Abstract title): Manufacture of high alumina hydraulic binders: A method for the manufacture of a high alumina hydraulic binder comprising hydrating a source of aluminiumions with a source of calcium ions in the presence of water to form mineral hydrates and subsequently heating said mineral hydrates to form the high alumina hydraulic binder. Also provided is a method for the manufacture of calcium aluminate cement comprising mixing a source of calcium ions with water treatment residuals or other aluminium rich waste residuals, in the presence of water, such that mineral hydrates are formed. Water treatment residuals are waste material produced from the industrial purification of drinking water by coagulation using a flocculant. The mineral hydrates are then heated to a temperature of at least 350 °C to oxidise organic material present and at least partially dehydrate the hydrated minerals to form the cement product. Further provided is a method for the manufacture of calcium sulphoaluminate cement by following the previous method with the modification of mixing sulphate salts with the calcium ions and residuals. The source of calcium ions may comprise lime or hydrated lime. The mineral hydrates may be comminuted prior to heating. Air or oxygen may be added to the mixture during heating.

(71) Ardex Anlagen GmbH, Friedrich-Ebert-Strasse 45, 58453 Witten (DE)


Related articles:

Issue 2021-8 WO 2021/180594 A1

Slag-based hydraulic binder, dry mortar composition comprising same and system for activating a slag-based binder

(22) 05.03.2021 (43) 16.09.2021 (57) The aim of the invention is to provide a hydraulic binder based on ground granulated blast-furnace slag, devoid of Portland cement, which enables improved setting...

Issue 2015-12 US 2015/0299040 A1

Molten salt synthesis for manufacture of cement precursors

(22) 08.11.2013 (43) 22.10.2015 (57) A method of manufacturing calcium silicates, calcium aluminates, calcium aluminosilicates and calcium ferrites and the products thereby derived utilizing...

Issue 2021-6 US 2021/0179492 A1

Method for preparing an ettringite binder for producing construction materials

(22) 07.11.2018 (43) 17.06.2021 (57) A method for preparing an ettringite binder from an aluminosilicate source, a calcium sulfate source and a calcium hydroxide (or slaked lime, CH) source, the...

Issue 2017-11 US2017267593 (A1)

Chemical additive for calcium sulphoaluminate-modified Portland cement

(22) 29.09.2015 (43) 21.09.2017 (57) A chemical additive for calcium sulphoaluminate-modified Portland cement comprises the following substances: (a) at least one alkanolamine borate; (b) at least one...

Issue 2017-4 WO 2017/017376 A1

Long-workability calcium aluminate cement with hardening ­promoted by a temperature increase, and related use

(22) 27.07.2016 (43) 02.02.2017 (57) The invention relates to a calcium aluminate cement containing a calcium aluminate with a first crystallized mineralogical phase of calcium dialuminate CA2,...