Method and device for preparing building gypsum from desulfurized gypsum

Abstract

The invention relates to a desulfurized gypsum comprehensive treatment process in particular to a method for preparing building gypsum by desulfurized gypsum and a device of the building gypsum. An adopted technical solution is that the method for preparing the building gypsum by the desulfurized gypsum comprises the following steps: drying a desulfurized gypsum raw material with hot air, wherein the baking temperature is controlled between 110-130 DEG C and a water content after drying is smaller than or equal to 3%; calcinating the dried gypsum, wherein the clacinating temperature is between 150-160 DEG C and the calcinating time is between 20-40 minutes; cooling the calcinated gypsum to 50-60 DEG C, feeding the cooled material to a ball mill for pulverizing, wherein a particle size of the pulverized material is more than 200 meshes.

Description

technical field [0001] The invention relates to a comprehensive treatment process for desulfurized gypsum, in particular to a method and a device for preparing building gypsum from desulfurized gypsum. Background technique [0002] With the promotion of desulfurization projects in coal-fired power plants, the annual output of desulfurization gypsum in my country is nearly 100 million tons. If desulfurization gypsum cannot be effectively treated, it will not only waste resources, but also cause secondary pollution to the environment. If it can be used reasonably , comprehensive development, will turn waste into treasure. [0003] At present, in the desulfurization gypsum production line, methods such as one-step method, two-step method, calcination and grinding are generally used. The one-step method is a treatment process that integrates drying and calcination. The gypsum raw material is sent into the calcination furnace by the conveyor, and under the action of mechanical di...

AI Technical Summary

Problems solved by technology

The one-step method is a treatment process that integrates drying and calcination. The gypsum raw material is sent into the calcination furnace by the conveyor, and under the action of mechanical dispersion force and hot air, it is evaporated and dehydrated along the rotating route. After meeting the moisture requirements of the raw material, it is discharged by The process flow is simple, but the material stays in the calcination furnace for a long time, and the calcination is uneven due to the limited conditions in the furnace, which is prone to over-burning and under-burning, and the calcined raw materials contain a lot of soot; two-step method It is first dried and then calcined. The raw material is calcined after removing part of the moisture of the raw material through a dryer or a dryer. This process shortens the calcining time, but it cannot change the internal crystal structure of the material, and it will condense into blocks after calcining, which is easy to occur. Under-burning or over-burning phenomenon, the performance of the produced gypsum powder is unstable; using the method of calcination and grinding, different phase transformation processes will occur in grinding under high temperature environment, thus affecting the quality of building gypsum

[0004] The temperature of the material after grinding by the above three methods is relatively high, so it can only be transported to the finished product warehouse for cooling, so that it is easy to age the finished product, and it is easy to absorb the water vapor in the warehouse, causing the raw materials to condense. bulk

Images