Ardealite basis composite gelled material and coagulant thereof

Abstract

The invention discloses an ardealite basis composite gelled material and a coagulant of the ardealite basis composite gelled material, wherein the composite gelled material and the coagulant composed of dry basis ardealite, blast furnace slag, portland cement, agstone and quicklime are blended in proportion and are grinded; the proportion of ardealite, blast furnace slag, portland cement, agstone and quicklime by weight is (34-48): (35-42): (4-10): (6-16): (2-6); the coagulant is high-alumina cement or sodium aluminate; and the addition of high-alumina cement or sodium aluminate is 1-4% or 0.5-4% that of the weight of the composite gelled material. In part of the application fields, the ardealite basis composite gelled material and the coagulant of the material can replace cement, and the production costs for the ardealite basis composite gelled material and the coagulant are more than 20% lower than that of the cement, and a large amount of ardealite can be consumed, so that the pressure of piling the ardealite of the phosphatic fertilizer enterprises can be alleviated.

Description

Technical field [0001] The invention relates to a phosphogypsum-based composite cementing material and a coagulant thereof. Background technique [0002] The main component of industrial by-product phosphogypsum is calcium sulfate dihydrate, which is an important choice to replace natural gypsum as a cementing material. But because phosphogypsum contains a lot of harmful impurities, especially P 2 O 5 Impurities such as free sulfuric acid and free sulfuric acid have a great influence on the strength and setting time of cementitious materials, so they cannot be used directly. At present, the application of phosphogypsum to prepare cementitious materials in industry usually adopts pretreatment and calcination methods. The pretreatment mainly includes water washing method and neutralization method. Although the water washing treatment can remove most of the harmful impurities, due to the high treatment cost, the use is limited; the neutralization method uses quicklime to neutraliz...

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Problems solved by technology

The calcination method is to remove the crystal water in phosphogypsum by heating at high temperature to obtain a cementitious material whose main component is anhydrous gypsum or hemihydrate gypsum. The disadvantage is high energy consumption, which also limits its wide application.

The advantage of non-calcination treatment is low treatment cost, but due to the disadvantages of low strength of calcium sulfate dihydrate and long initial and final setting time, it usually needs to be mixed with other cementitious materials such as fly ash, blast furnace slag powder, cement, and It can only be made into products such as bricks or boards, and cannot be used as a cementitious material for direct on-site construction, which limits its application and limits the utilization and conversion rate of phosphogypsum

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