Pretrement of tail ore, concretion cementing material prepared therewith and their prepn

Abstract

The present invention relates to pre-treatment of tail ore, concretion cementing material obtained therewith and their preparation process. Tail ore in 30-90 wt%, salts connecting K+, Na+, Ca2+, Mg2+ and/or Fe2+ ion and acid radical ions in 0.1-8 wt%, and other material containing crystal water, hydroxide radical, hydroxyl group, CO22 or other volatile components in 5-60 wt% are mixed, and the mixture is then hydrothermal alteration reacted at 200-900 deg.c. Then, the hydrothermal alteration reacted material in 50-90 wt%, cement clinker in 0.1-29 wt%, blast furnace slag or other high temperature treated waste in 0-30 wt%, gypsum in 0-8 wt% and rock forming agent in 0.1-5 wt% are mixed and ground to obtain cement powder. The cement powder has high strength and high stability.

Description

technical field [0001] The present invention relates to a cementitious material, more specifically, to pretreated tailings, gel cementitious materials prepared from the pretreated tailings as main raw materials and their preparation methods. Background technique [0002] Tailings are one of the largest solid wastes in my country. At present, the total annual output of tailings in my country is 600 million tons, of which 500 million tons are iron tailings, and the rest are non-ferrous metal tailings, precious metal tailings and non-metallic tailings. The accumulated stockpile of tailings in my country is 6 billion tons. Except for a few skarn-type iron ore tailings and some non-metallic mine tailings, SiO 2 with Al 2 o 3 The sum is greater than 50%, so it belongs to the high-silicon-aluminum system. Such a large amount of tailings stockpiles not only occupies a large amount of farmland, mountains and rivers, causing serious damage to the environment and ecology, but also...

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. 200310109672 relates to a method for producing cement or cement products from metal tailings (skarn), which discloses adding 10 to 35% metal tailings (skarn) as a mixture to produce cement and A method of partially replacing cement to produce cement products, but still continuing the basic manufacturing process of traditional high-calcium system cement

[0003] The patent for invention with the publication number 02158190 "Concrete Binary Wet Cement and Its Uses" describes the method of preparing gelatinous cementitious materials by wet method with a large amount of waste residue, but does not introduce the principle of hydrothermal alteration. The technology of pretreatment, also does not include the technology of producing concrete with tailings as the main raw material