A waste slag modification additive and a method for using the additive to modify waste slag

Abstract

The invention provides a waste ore slag modifying additive and a modification method therewith. The additive includes cement and a modifying curing agent and is particularly prepared through steps of:grinding waste ore slag, being 10-27% in water content, into powder being 200-300 meshes in particle size, adding cement dry powder to the waste ore slag according to mass ratio of 5-15% of the totalamount of the waste ore slag; adding the modifying curing agent according to mass ratio of 0.3-0.8% of the total amount of the waste ore slag with uniform stirring, wherein the modifying curing agentis prepared from, according to a formula, a metal cation chelate, a nano-oxide, oxidized quinoline, high-valence metal salt, polyethylene glycol, sodium fluosilicate, a retarder, a crosslinker, silica gel, and glucose. In the invention, the modifying additive is directly dry-blended with the waste ore slag in site for direct use, wherein additional water is unnecessary during the use process. Thewhole modification process is in a water-deficient reaction, which is completely different from a cement reaction route in the prior art. During construction, by directly performing dry powder pressing, construction process is simplified and construction cost is reduced.

Description

technical field [0001] The invention relates to the field of industrial waste slag modification, in particular to a waste slag modification additive and a method for using the additive to modify waste slag. Background technique [0002] With the continuous development of my country's industrial technology, the output of various industrial waste residues is also increasing, the most common of which are red mud, phosphogypsum, and mine tailings. [0003] Red mud is the solid waste discharged during the alumina production process, about 1.0 to 1.3 tons of red mud is produced per 1 ton of alumina produced; according to the different alumina production methods, it is divided into sintering method, Bayer method and mixed method red mud. According to incomplete estimates, my country discharges hundreds of millions of tons of red mud every year, and the accumulated stockpile of red mud reaches tens of millions of tons. Because the chemical bonds bound by red mud are difficult to re...

AI Technical Summary

Problems solved by technology

At present, the effective utilization rate of phosphogypsum in China is less than 10%. Only a very small amount of phosphogypsum is used to produce building materials, and the remaining huge amount of phosphogypsum is piled up as solid waste. Harmful heavy metal chemicals such as arsenic, cadmium, and mercury pollute the environment

In addition, due to the extremely fine particles of the tailings, if there is a strong wind after drying, it is easy to raise dust and affect the surrounding environment.

At the same time, in the mining process of mineral resources, a large amount of tailings resources are accumulated, which pollutes the environment, poses a serious threat to human survival, and causes a waste of mineral resources.

[0006] Because these waste slags contain various harmful components and cannot be used directly, they need to be modified. The current modification methods are all modified for certain industrial slags or certain uses, and their application range is limited and the utilization rate is low. , can not alleviate the pressure of environmental pollution and alleviate the shortage of mineral resources and other issues

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