Autoclaved yellow phosphorus slag pavement brick and making method thereof

Abstract

The invention discloses an autoclaved yellow phosphorus slag pavement brick and a making method thereof. The autoclaved yellow phosphorus slag pavement brick is made of yellow phosphorus slag powder, granular yellow phosphorus slag, quicklime powder and phosphogypsum. The making method comprises the steps of: grinding the dried yellow phosphorus slag into powder; then mixing the granular yellow phosphorus slag with the quicklime powder and the phosphogypsum, adding water, stirring and uniformly mixing; making a brick blank body; autoclaving to make the autoclaved yellow phosphorus slag pavement brick. The autoclaved yellow phosphorus slag pavement brick disclosed by the invention is superior to a common pavement brick product, and is simple in ingredients so that the input of types of raw materials is reduced; yellow phosphorus slag with different finenesses is matched to be used as a compound exciting agent, thus an unexpected effect is achieved; in a making process, a better exciting condition is provided, the production process is easy to control, and the product quality is more stable; in a case where no cement is used, the strength is enabled to reach the use requirement of the pavement brick, the production cost is lowered, and the yellow phosphorus slag resources are effectively utilized; although the consumption of the phosphogypsum is reduced, the problem that an autoclaved phosphorus slag brick is not suitable for pavement building is solved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an autoclaved yellow phosphorus slag pavement brick and a manufacturing method thereof. Background technique [0002] As an intermediate product of thermal phosphoric acid, the demand for yellow phosphorus is increasing day by day. Correspondingly, the yellow phosphorus slag produced in the yellow phosphorus production process also increases accordingly. Yellow phosphorus slag is the waste slag discharged from the following reactions during the production process of yellow phosphorus from apatite, quartz, and coke in an electric arc furnace at a high temperature of about 1600 ° C. Its main composition is CasiO 3 : [0003] 2Ca 3 (PO 4 ) 2 +6SiO2 2 +10C→6CasiO 3 +10CO↑+P 4 [0004] At present, 8-10 tons of yellow phosphorus slag will be produced for every 1 ton of yellow phosphorus produced in China. Due to the uncontrolled discharge of yellow phosphorus slag, it is ver...

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Problems solved by technology

[0008] The purpose of the present invention is to provide an autoclaved yellow phosphorus slag pavement brick and its manufacturing method, which solves the problems of low effective utilization rate of yellow phosphorus slag and great environmental pollution in the prior art, and the low strength of ordinary phosphorus slag bricks , high cost, unsuitable for pavement masonry

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