Expanded ceramisites prepared from residual sludge in combination with FCC spent catalyst and preparation method of expanded ceramisites

Abstract

The invention discloses expanded ceramisites prepared from residual sludge in combination with an FCC spent catalyst and a preparation method of the expanded ceramisites, and belongs to the technicalfield of environmental waste utilization. The invention solves the technical problem in the prior art that residual sludge and spent catalysts can not be reasonably utilized. The preparation method comprises the following steps: taking the residual sludge and the FCC spent catalyst as raw materials for preparing the expanded ceramisites, adding a fluxing agent to the raw materials to reduce the ceramisite sintering temperature, adding a foaming agent hydrogen peroxide gas production substance to enhance expansibility, fully stirring the obtained ingredients, granulating the stirred ingredients, drying and preheating the granulated ingredients, roasting the preheated ingredients, and cooling the ceramisites obtained after roasting to obtain finished products. The leaching rate of heavy metals in the prepared ceramisites is greatly lowered, the harmless purpose of the spent catalyst is realized, and the ceramisites are prepared from the spent catalyst in combination with the residual sludge, thereby realizing recycling and achieving the aim of treating wastes with other wastes.

Description

technical field [0001] The invention relates to the technical field of environmental protection waste utilization, in particular to a preparation method of expanded ceramsite. Background technique [0002] In the catalytic cracking unit, due to the pollution of the catalyst by heavy metals, the activity of the catalyst decreases rapidly, which leads to the deterioration of the reaction selectivity of the catalyst. The activity and selectivity of the balancer cannot be maintained only by natural running loss and replenishment of new agents. Therefore, it is necessary to periodically A part of the balancer is discharged to ensure the activity and selectivity level of the catalyst in the device. This unloaded balancer is called catalytic cracking spent catalyst (hereinafter referred to as spent catalyst). Spent catalysts have low activity and contain a certain amount of heavy metals. They are highly polluting and difficult to treat innocuously. Unregulated random disposal will...

AI Technical Summary

Problems solved by technology

The spent catalyst has low activity and contains a certain amount of heavy metals, which is highly polluting and difficult to treat innocuously. Unregulated random disposal will pose a serious threat to the living environment of human beings.