Preparation method of dry materials for fertilizer catalyst

Abstract

The invention relates to the field of fertilizer catalysts, in particular to a preparation method of dry materials for a fertilizer catalyst. A circular steam coiler is adopted to boil and evaporate water in materials with steam. The preparation method comprises the following steps of: (1) putting a solution with prepared assistants in one or more rectangular comals, wherein the number of the rectangular comals is decided by the quantity of the solution; (2) pumping residual steam tail gases of a former workshop section into a circular steam pipeline at the bottom of one or more comals communicated with one steam pipeline to save and utilize steam tail gases; and (3) boiling to prepare dry materials in a boiling range from 60 DEG C to 120 DEG Cand entering a baking procedure if the prepared dry materials are dried to contain about 30 percent of water, wherein one ton of material needs to be boiled for 4h. Compared with a traditional drying technology, the invention has the advantages of high steam utilization in material drying, quality guarantee of assistant contents, relatively even stirring, stable product quality, simple process, safe operation and the like.

Description

technical field [0001] The invention relates to the field of fertilizer catalysts, and relates to a preparation method for drying fertilizer catalyst materials. Background technique [0002] At present, in the production process of high-temperature shift catalysts used in domestic fertilizers, after acid-base neutralization is completed, the concentration of the liquid is controlled within a certain range, and an appropriate amount of additives is added to make the solution dry. There are two ways to complete it. That is (1) film drying: the slurry prepared with various additives is pumped to the high tank of the thin dryer under stirring, and flows into the thin dryer by self-flow and adjusted speed. The slurry is on the top of the thin dryer. With the help of the centrifugal force generated by the rotation of the rotating shaft, it is thrown to the inner wall of the thin dryer. The jacket is filled with steam, and the inner wall is heated to 140°C. As the slurry water atta...

AI Technical Summary

Problems solved by technology

The existing problems are: first, the steam pressure required by the film drying process must be kept at 0.4mpa for a long time, and the gas volume consumption is large, which does not meet the current trend of resource-saving production and the requirements of energy saving and consumption reduction advocated by the chemical industry

Second, the disadvantage of the vacuum filtration drying process is that if some water-soluble additives are added in the batching tank, they will easily be lost with the water during the suction filtration process. If they are added in the subsequent process, the mixed materials will not be uniform and affect the product. quality, these are serious obstacles to quality assurance in catalyst production