Method for preparing composite flame retardant from ardealite

Abstract

The invention provides a method for preparing a composite flame retardant from ardealite. The method comprises the following steps: S1, preparing gypsum particles; S2, preparing slurry; S3, performing material wrapping; S4, filtering; S5, drying; S6, placing at low temperature; S7, performing circular treatment; and S8, obtaining the finished product. According to the invention, the composite flame retardant is prepared by compounding the mixed slurry outside the gypsum particles for multiple times, so that the phosphogypsum can be further utilized, the stockpiling amount of the phosphogypsum can be reduced, and the cost of the flame retardant can be effectively reduced on the premise of not reducing the flame retardance; and a wrapping layer outside the prepared composite flame retardant is decomposed when heated to absorb heat on the surface of comburent, the surface temperature of the synthetic material filled with the wrapping layer in flame is reduced, meanwhile, a large amount of water is released to dilute oxygen on the surface of the comburent, active oxide generated through decomposition is attached to the surface of the comburent, combustion is further prevented, and the temperature of the gypsum particles inside cannot be excessively increased and harmful substances cannot be generated.

Description

technical field [0001] The invention relates to the technical field of flame retardant processing, in particular to a method for preparing a composite flame retardant by using phosphogypsum. Background technique [0002] Phosphogypsum is a solid waste in the phosphate fertilizer industry. Generally, 4.5-5.0 tons of phosphogypsum is produced for every ton of phosphoric acid produced, and 2.5-5.0 tons of phosphogypsum is discharged for every ton of diammonium phosphate produced. The annual discharge of phosphogypsum in the country is more than 70 million tons, and the utilization rate is only about 40%. The current stockpiles have exceeded 300 million tons. The treatment and utilization of phosphogypsum is one of the major problems that the phosphorus chemical industry urgently needs at present. It has become a major bottleneck restricting the development of the phosphorus chemical industry in Guizhou. The multi-channel development and application of phosphogypsum resources is...

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Problems solved by technology

In order to improve the utilization rate of phosphogypsum, the applicant is currently cooperating with scientific research institutions in Guizhou Province to process phosphogypsum into various PVC power pipes, communication pipes, various PE drainage and sewage pipes, road inspection manhole covers, water grates and other products. However, the consumption of phosphogypsum is still difficult to quickly consume the stockpile. In addition, with the continuous extension of the phosphate fertilizer industry, phosphogypsum is also constantly produced. Therefore, it is still necessary to further develop more Many phosphogypsum utilization channels