Application of cured inorganic acid in fertilizer production and fertilization

Abstract

Provided is an application of a cured inorganic acid in fertilizer production and fertilization; an inorganic acid is cured into a semi-solid or solid material by a chemical curing method, and the semi-solid or solid material is used as a solid phosphate-solubilizing agent and used for dry-method production of a high-concentration nitrogen and phosphorus compound fertilizer directly from a phosphate ore (powder) through one-time processing at room temperature, sylvite, cement kiln dust or some potassium ores, humic acid substances or trace element compounds and the like also can be added for together preparing a compound fertilizer with multiple nutrients; ammonia also can be used for acting with the cured acid to prepare a new nitrogen-containing fertilizer through a dry method or a semi-dry method. The method for producing the fertilizer with the cured acid has the advantages of simple process, easy operation, low energy consumption, no three wastes, no strict requirement on the grade of ores and the like and is suitable for general promotion. In addition, the cured acid also can be used as an additive and is applied with other fertilizers (trace element fertilizers or various phosphate fertilizers soluble in citric acid and the like) together, and the fertilizer efficiency of other fertilizers can be improved.

Description

technical field [0001] The invention belongs to the application of solidified inorganic acid in fertilizer production and application and its application technology. Background technique [0002] As we all know, aqueous solutions of various inorganic mineral acids are widely used in fertilizer production. For example, use different concentrations of sulfuric acid, nitric acid, hydrochloric acid and phosphoric acid to react with ammonia or ammonia water to produce ammonium sulfate, ammonium nitrate, ammonium chloride and ammonium phosphate (monoammonium or diammonium), etc.; Calcium superphosphate, nitrophosphate fertilizer, precipitated calcium phosphate and double superphosphate, etc. However, due to the strong corrosiveness of inorganic acids, it is very inconvenient to store, transport and use acids in a solution state, especially the use of aqueous solutions of inorganic acids in the production of fertilizers brings many difficulties to production, such as the use in th...

AI Technical Summary

Problems solved by technology

However, due to the strong corrosiveness of inorganic acids, it is very inconvenient to store, transport and use acids in a solution state, especially the use of aqueous solutions of inorganic acids in the production of fertilizers brings many difficulties to production, such as the use in the production of phosphate fertilizers. The "wet" production process of various inorganic acid aqueous solutions to produce phosphate fertilizers has a long process, high energy consumption, many wastes, and serious pollution, which greatly affects the output and quality of phosphate fertilizers, and is far from meeting the growing demand for phosphate fertilizers in agriculture. needs

[0003] For the above-mentioned shortcomings of using an aqueous solution of inorganic acid in fertilizer production, and considering the difficulty of making a liquid inorganic acid a solid acid suitable for fertilizer production, we have found a method for using the inorganic acid in an aqueous solution of inorganic acid in the known technology. Chemical methods (addition or condensation) are solidified into semi-solid or solid state substances (hereinafter collectively referred to as "curing acids"). At the same time, it is noted that these curing acids are still mainly used in the fields of organic synthesis, metal cleaning, electroplating and oil exploration. , there are not many applications in the field of chemical fertilizers. Only a few curing acids have been directly used as fertilizers or fertilizer intermediates abroad. Other applications are still to be developed, so there is a huge potential