Method for preparing refractory material for cement kiln from calcium-magnesium phosphate rock tailings

Abstract

The invention provides a method for cleanly preparing a refractory material for a cement kiln from calcium-magnesium phosphate rock flotation tailings. The method improves the kiln coating hanging performance of a cement kiln firing zone refractory material, solves the chromium pollution problem of a traditional magnesite-chrome brick, reduces the exploitation of dolomite resources, and solves theproblems of occupied land, environmental pollution, safety threat and the like of the phosphate rocks. The main component of the phosphate rock tailings is carbonate minerals of calcium and magnesium, and the phosphate rock tailings contain a small amount of phosphorus, silicon, aluminum, iron and the like. The method comprises the following steps: performing flotation purification on the tailings, performing light burning and digestion treatment on calcium and magnesium components, homogenizing the treated calcium and magnesium components with calcined magnesite, ageing, adding zirconium oxide, vanadium oxide, yttrium oxide and other modifiers, and performing deep calcination to finally synthesize the refractory material which can be applied to the cement kiln firing zone and can replacethe magnesite-chrome brick. High-added-value utilization of the calcium-magnesium phosphate rock tailings can be achieved, a new profit growth point is brought to phosphorus chemical enterprises, andsustainable development of the phosphorus chemical enterprises is promoted.

Description

technical field [0001] The invention relates to a method for producing refractory materials for cement kilns by utilizing calcium-magnesium phosphate ore tailings, in particular, it can be used for cement kiln sintering after the process of purification, light calcination, hydration, modification and secondary calcination. Refractory material with belt. Background technique [0002] Phosphate ore tailings are bulk mining solid wastes produced by the phosphorus chemical industry after beneficiation and extraction of concentrates. Every 1 million tons of phosphate rock will produce 300,000 to 400,000 tons of phosphate tailings. The annual output of phosphorus tailings in my country exceeds more than 10 million tons. At present, the comprehensive utilization rate of phosphorus tailings in my country is less than 10%, and most of them are stored in tailings ponds. The accumulation of phosphorus tailings will not only bring about environmental problems such as water pollution, l...

AI Technical Summary

Problems solved by technology

At present, the comprehensive utilization rate of phosphorus tailings in my country is less than 10%, and most of them are stored in tailings ponds

Magnesia-chrome bricks have high refractoriness, resistance to silicon oxide erosion, and good chemical stability. They also have good high-temperature mechanical properties and kiln skin properties, but in alkaline or sulfur-containing environments, Gr 3+ Easy to transform into heavy metal pollution ion Gr 6+ , causing great harm to the environment and human health

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