Portland cement of industrial tailing

Abstract

The industrial tailing cement is prepared with cement clinker, gypsum and treated Ca-Mg tailing in certain proportion, and through mixing, and grinding to 80 micron size. The tailing content is 6-15 wt% in portland cement, 15-50 wt% in composite portland cement, 20-50 wt% in gaize cement, 20-50 wt% in portland blast furnace slag cement, and 20-50 wt% in type-II portland cement. The cement with industrial tailing is easy to produce hydrated silicate, has high technological indexes, especially cement stability.

Description

Technical field [0001] The invention relates to cement, especially cement made from industrial tailings. Background technique [0002] The known Portland cement is made by mixing Portland cement clinker, gypsum and fly ash or slag according to a certain ratio, and grinding them. A certain proportion of fly ash or slag is used as a mixed material in cement, mainly to use its hydration activity to generate hydrated silicate, and to produce different standard cements that meet national regulations. In fact, there is another kind of material that can be used as a good cement mixture material, that is, the tailings of metal mines. Generally speaking, more than 80% of the tailings produced by ore mining after beneficiation are discharged and piled up as industrial waste residues. In my country, the annual discharge of the above-mentioned tailings is difficult to calculate, and the current accumulation volume has reached several billion tons. The accumulation and discharge of hu...

AI Technical Summary

Problems solved by technology

The accumulation and discharge of huge tailings not only occupy arable land and pollute the environment, but also impose a huge burden on the country and enterprises