Phosphogypsum ceramsite for sewage filtration and preparation method thereof

Abstract

The invention relates to the technical field of ceramsite for sewage filtration and particularly relates to phosphorus gypsum ceramsite for the sewage filtration and a preparation method of the phosphorus gypsum ceramsite. According to the preparation method, phosphorus gypsum powder is prepared from phosphorus gypsum, clay is modified to form clay powder, shale, ferrous sulfide and aluminum oxide mutually act to generate shale powder, the proportion of the phosphorus gypsum powder to the clay powder to the shale powder is reasonably designed, the utilization amount of the phosphorus gypsum is relatively large, and the utilization amounts of the clay and the shale are relatively small, the consumption of natural resources is reduced, the effectively utilization of phosphorus chemical industry waste is realized, and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of ceramsite for sewage filtration, in particular to phosphogypsum ceramsite for sewage filtration and a preparation method thereof. Background technique [0002] With the rapid development of industry, the amount of sewage discharge is increasing; with the discharge of sewage, many harmful elements or microorganisms will enter the biological chain, causing serious harm to animals, plants and humans. Therefore, it is necessary to purify sewage After reaching a certain standard, the discharge is strictly required by the current environmental protection department. [0003] Ceramsite is a relatively cheap raw material product in the process of sewage treatment, and is widely used in the field of sewage treatment to realize the purification of sewage. However, in the prior art, ceramsite is generally prepared by a sintering method and an unfired method, and the preparation of ceramsite by the sintering method ...

AI Technical Summary

Problems solved by technology

However, in the prior art, ceramsite is generally prepared by a sintering method and an unfired method, and the preparation of ceramsite by the sintering method has become the most mature process at present, but the process for preparing ceramsite is relatively complicated and the cost is high; and the unfired method Although high-temperature sintering treatment is avoided, it has relatively high requirements for raw materials, and it is not easy to form high-strength, low-density lightweight ceramsite

[0004] Based on this, for the preparation of ceramsite, the research has been focused on the cost of ceramsite preparation, the compressive strength and low density of ceramsite, but no major breakthrough has been made, so that the bulk density of ceramsite remains at 600kg / m 3 Above, the cylinder compressive strength is below 5MPa, which greatly affects the quality of ceramsite products and the application cycle of ceramsite products in sewage treatment

[0005] Phosphogypsum is a solid waste produced by the phosphorus chemical industry. It has the characteristics of light weight. However, due to the extremely poor plasticity of phosphogypsum, the application of phosphogypsum in various fields is less. For example, some researchers apply phosphogypsum to ceramics. In the field of ceramsite preparation, phosphogypsum is not directly used as the main raw material for the preparation of ceramsite, but it is added as a small amount to the main raw material of ceramsite, and ceramsite is obtained through granulation, curing or sintering.

It can be seen that in the prior art, it is difficult to use a large amount of phosphogypsum as a raw material in the production process of ceramsite, which makes it difficult to alleviate the accumulation of a large amount of solid waste generated by the phosphorus chemical industry.