A kind of phosphogypsum wall brick and preparation method thereof

Abstract

The invention discloses a phosphogypsum wall brick, which comprises the following raw materials in parts by weight: 90-105 parts of phosphogypsum, 6-10 parts of carbide slag, 8-15 parts of hydraulic admixture, 5-8 parts of rough stone, 10-16 parts of stone powder, 0.5-2 parts of anhydrous sodium sulfate, 3-5 parts of water glass, 0.05-0.2 part of calcium formate, and 2-6 parts of calcium lignosulphonate. The wall brick has the characteristics of light weight, high strength, low water absorption, high softening coefficient and good freezing resistance, is suitable for a building load-bearing and spacing wall body. The invention also discloses a preparation method of the phosphogypsum wall brick. According to the method disclosed by the invention, large quantities of industrial waste residue phosphogypsum is effectively utilized, the building material resource comprehensive utilization of the phosphogypsum can be achieved; meanwhile, a phosphogypsum and carbide slag composite pelletizing technology is adopted harmful substances in the phosphogypsum raw material can be removed, and the softening coefficient and strength of a phosphogypsum product can be increased.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial waste slag building materials, and in particular relates to a phosphogypsum wall brick and a preparation method thereof. Background technique [0002] Phosphogypsum is the industrial waste slag discharged during the production of phosphoric acid. For every ton of phosphoric acid produced, 5 tons of phosphogypsum are discharged. With the continuous development of my country's chemical industry, the discharge of phosphogypsum is increasing year by year. The main phase component of phosphogypsum is calcium sulfate dihydrate (CaSO 4 2H 2 O), which also contains a small amount of impurities, such as soluble phosphorus, eutectic phosphorus, organic matter, soluble fluorine, etc. Impurities have adverse effects on the setting time of gypsum and the strength of the product, and are difficult to remove. In addition, phosphogypsum products generally have the disadvantages of eas...

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Problems solved by technology

At present, research and patents on the preparation of various brick wall materials using industrial waste phosphogypsum as the main raw material have appeared in China. However, after comprehensive comparison and consideration, there are the following problems: 1. The raw material of phosphogypsum cannot be removed without pretreatment. Harmful impurities, Affect the performance of the product; 2. The phosphogypsum raw material is calcined to form a gelling architectural phosphogypsum (CaSO 4 0.5H 2 O), resulting in energy consumption in actual production; 3. During the preparation or production process, the method of steaming and curing raw materials or products with high temperature and high pressure steam makes the production process complicated and causes waste of water and electricity resources

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