Fish reef cementing material containing nano-tailings and preparation method thereof

Abstract

The invention belongs to the fields of mining industry and marine environment, and particularly relates to a fish reef cementing material containing nano-tailings and a preparation method thereof. Magnetite-quartzite tailings are graded by a screen with 60 to 100 meshes, and screened parts are dried and then finely ground until the specific surface area ranges from 3000 to 4000 cm<2> / g. After being mixed according to the proportion of 50 to 60 percent of tailings and 40 to 50 percent of blast furnace water quenched slag, the finely ground tailings and the dried blast furnace water quenched slag are further processed by mix grinding until the specific surface area ranges from 4000 to 5000 cm<2> / g. The mixed fine powder of the tailings and the water quenched slag is mixed with cement clinkerand plaster, the mixed powder accounts for 75 to 85 percent, the cement clinker accounts for 10 to 15 percent, and the plaster accounts for 5 to 10 percent. Third mix grinding is carried out on the mixed material in a ball grinder until the specific surface area ranges from 5000 to 6000 cm<2> / g, thereby obtaining the fish reef cementing material containing the nano-magnetite-quartzite tailings. The invention solves the problem of difficult utilization of extremely fine-grained magnetite-quartzite tailings in the prior art. Compared with the common Portland cement, the content of the cement clinker in the cementing material is reduced by more than 5 times, the content of Ca(OH)2 in hydrate products is reduced, and the alkalinity of artificial fish reef concrete can be greatly lowered.

Description

technical field [0001] The invention belongs to the fields of mining and marine environment, and in particular relates to a fish reef gelling material containing nano tailings and a manufacturing method thereof. Background technique [0002] The annual output of magnetite-quartzite tailings in my country exceeds 250 million tons, and the cumulative stockpiles exceed 2 billion tons. Over the years, with the continuous increase in the price of iron concentrate and the advancement of beneficiation technology, the fineness of ore grinding in the beneficiation process is getting higher and higher, and the tailings discharged are also getting finer and finer. The extremely fine-grained tailings bring difficulties to the production of traditional building materials such as tailings blocks, and it also brings difficulties to full tailings cemented filling mines. In addition, the large stockpiling of very fine tailings also brings greater pressure on the environment and safety. [...

AI Technical Summary

Problems solved by technology

The extremely fine-grained tailings bring difficulties to the production of traditional building materials such as tailings blocks, and also bring difficulties to full tailings cemented filling mines

In addition, the large stockpiles of ultra-fine tailings have also brought greater pressure on the environment and safety

[0003] Liu Baoquan and others invented "a load-bearing block or brick without burning and steaming of iron tailings and its manufacturing process (CN1727301)"; Guan Changjun and others invented "the method of manufacturing building products with iron tailings powder (CN1944325)"; the above Neither patent considers the problem of taking full advantage of the fineness characteristics of very fine tailings, nor does it consider the need to reduce alkalinity to meet the needs of artificial reefs

The invention patent of Wang Xianjin et al. "Method for producing masonry cement by using iron tailings and high-calcium fly ash (CN1065851A)", although the fineness characteristics of the tailings were considered, did not mention the role of nanoparticles in it. effect, and did not consider lowering its alkalinity to accommodate artificial reef production