Foamed concrete product and method for preparing foamed concrete product using titanium gypsum

Abstract

Foamed concrete product and method for preparing foamed concrete product by using titanium gypsum, in the method for preparing foamed concrete product by using titanium gypsum, the raw materials are composed of the following components by weight: 50-55 parts of titanium gypsum powder, 18-22 parts of slag powder , 20 to 25 parts of Portland cement, 1 to 1.5 parts of foam stabilizer, 1 to 1.5 parts of cement foaming agent, and 0 to 0.8 parts of water reducing agent; first dry-mix titanium gypsum powder, slag powder and Portland cement Evenly, add water according to the water-cement ratio of 0.4~0.5, and add foam stabilizer and stir evenly, the wet bulk density of the mud is 2.1~2.3g / cm 3 ; Then add an appropriate amount of water reducing agent and cement foaming agent to the mixed mud, and the wet bulk density of the foam is controlled at 1.05 ~ 1.45g / cm 3 ; After that, the foam is injected into the mold to form, and after demoulding, it is placed in a closed kettle, steam is introduced into the kettle, and the pressure is 1.15-1.20MPa for 7-8 hours, and finally dried to constant weight under natural conditions . The foamed concrete product prepared by the above method has the characteristics of light weight, high compressive strength and wide application range.

Description

technical field [0001] The invention relates to the technical field of industrial solid waste recycling, in particular to a foamed concrete product and a method for preparing the foamed concrete product by using titanium gypsum. Background technique [0002] Most of the existing foamed concrete is fully foamed by the foaming agent in a mechanical way by a foaming machine. After stirring evenly, cast-in-place work or mold forming is carried out, and then corresponding maintenance measures are used to prepare it. The main hydration products are hydrated calcium silicate gel and ettringite, etc., and the hydration products overlap each other, thereby Make the foam concrete have a certain strength. [0003] Titanium gypsum is a by-product in the production process of titanium dioxide by sulfuric acid method. For every 1 t of titanium dioxide produced, 4t to 5t of titanium gypsum waste residue will be produced. A large amount of titanium gypsum has not been effectively utilized,...

AI Technical Summary

Problems solved by technology

[0004] At present, there have been some reports on the reuse of titanium gypsum waste residue. For example, Chinese patent document CN104478388A discloses a method for preparing non-burning and non-steaming titanium gypsum bricks with titanium gypsum. In the preparation method adopted in this document, the main material is still Aggregate and cement, the amount of titanium gypsum is low, and it is necessary to add alum to assist fermentation, and use anhydrous sodium sulfate and dihydrate gypsum to promote the solidification of the slurry (promote surface solidification and inner solidification). In addition, the above-mentioned titanium gypsum bricks Although it has high compressive strength, its dry bulk density is too high, so it is only suitable to replace traditional fired bricks (red bricks). Compared with foam concrete bricks, there is still a significant gap in light weight and thermal insulation effect

Chinese patent document CN108358578A discloses a method for preparing foamed concrete by using titanium gypsum and titanium tailings. In this method, the content of titanium gypsum in the preparation of foamed concrete reaches about 45%. Generally speaking, with the increase of titanium gypsum content , the strength of foam concrete will show a downward trend. In order to ensure the strength of the product, it is usually necessary to add sulphoaluminate cement and other admixtures to it. In the literature, the finished product obtained after adding sulphoaluminate cement has a bulk density of 407-1020 kg / m 3 , The strength is between 1.4 ~ 7.9MPa, the effect is still not ideal