Method for drying and burning alkali-containing aluminosilicate slurry

Abstract

The invention relates to a method of drying and burning alkaliferous aluminosilicate slurry, which is characterized in that the comprises two steps of atomizing drying and circular burning, the atomized slurry fogdrop is to contact with the vertically risen thermal current for drying, and then entering the firing furnace after circulation and growing; the slurry is continuously and circularly burnt in the furnace, the quality is preferably and the product is finished when the agglomerate material with higher specific gravity is out of the firing furnace. The method of the invention has the advantages that the slurry is fully atomized, the powdery material can fully contact with high temperature fume, and the heat exchange is promptly and completely with high heat transfer efficiency and low thermal loss. The sintering time of the powdery material in the furnace is short, the chemical reaction of material is fully, the unit volume productive capacity is higher with simple technological process and equipment, long performance period and low maintenance cost. The powdery material can realize closed feeding and closed discharge with slight dust pollution for environment.

Description

technical field [0001] A method for drying and firing alkali-containing aluminosilicate slurry, relating to an atomization drying and circulation firing method for alkali-containing aluminosilicate slurry, which is used for raw slurry, silicon Drying and firing of slag slurry and red mud slurry, pre-roasting of bauxite, and roasting of aluminum hydroxide. Background technique [0002] Regarding drying technology, there are many mature technologies, such as atomization drying, fluidized drying, flash drying and so on. However, for the drying and firing of alkali-containing materials, there is no mature application technology in the industry at present. For example, the mature dry kiln drying pre-decomposition technology in the cement industry has a great impact on the alkali metal oxide content R in raw materials. 2 O(K 2 O+0.65Na 2 O) the requirements are also very harsh, generally less than 1.0-1.5%, Cl - The content requirement is less than 0.015-0.023%, SO 3 2- The...

AI Technical Summary

Problems solved by technology

Existing clinker production process devices generally use rotary kilns, and the equipment generally has a diameter of 3-5 meters and a length of 60-120 meters. It needs a large reducer and a high-power motor to drive it to rotate. The flow direction of the drying medium is opposite to that of the drying medium. At the same time, in this equipment, the materials go through four processes of drying, preheating, decomposition and calcination from entering the equipment to leaving the equipment. These four processes are completed in a rotary kiln. This drying and firing process and equipment have many disadvantages: first, the equipment is very bulky and occupies a large area; second, the power consumption is large, and two-thirds of the power is used for the rotation of the equipment body; third, the energy consumption is high. , because the calcined material needs to be cooled before it can be transported into the next process, and the small particles in the piled state have poor heat exchange effect and need to be cooled with a large amount of cooling water, so the heat energy consumption is large and the heat utilization is low

5. Because it is a rotary device, its transmission system wears a lot, the refractory lining is easily damaged, and the maintenance cost of the equipment is high

[0006] For alkaline, Cl - , SO 3 2- The main technical problem in the atomization drying and firing of relatively high slurry is the problem of scabbing. There are three main reasons for scabbing: one is that the slurry is in contact with the wall of the drying furnace before drying, especially the viscous Larger materials are more prone to scarring on the furnace wall; second, due to the high temperature during the firing process, especially those containing alkali, Cl - , SO 3 2- Higher materials, after volatilization, are easy to condense on the lower temperature furnace wall and cause scarring; third, the liquid phase that appears in the low melting point material during the high temperature process is easy to form scarring on the cold furnace wall

Images