Preparation method of electrolytic manganese residue-based slow release fertilizer

Abstract

The invention provides a preparation method of an electrolytic manganese residue-based slow release fertilizer. The method mainly comprises the following steps: (1) compounding an inorganic non-metal slow-release material, crushed electrolytic manganese residues and other fertilizer component additives to form a slow-release fertilizer precursor; (2) mixing an active silicon-aluminum source and an acid activator to prepare an inorganic binder; and (3) mixing the slow-release fertilizer precursor with an inorganic binder, granulating and molding, curing, and bagging for later use. The prepared slow-release fertilizer is neutral, the problems of occupational health and environmental pollution in the preparation and use process of a conventional slow-release fertilizer are solved, and recycling of the electrolytic manganese residues and alkaline soil improvement are facilitated.

Description

technical field [0001] The invention relates to the field of solid waste recycling, in particular to a preparation method of electrolytic manganese slag-based slow-release fertilizer. Background technique [0002] my country is the world's largest producer, consumer and exporter of electrolytic manganese metal, with a production capacity of more than 2 million tons, and the slag production accounts for 98% of the total production of electrolytic manganese slag. Electrolytic manganese slag is an acidic filter residue produced in the production process of electrolytic manganese metal, and is the main pollutant in the electrolytic metal manganese industry. At present, the direction of resource utilization of electrolytic manganese slag is mainly in the field of building materials. Chinese patent CN112047702A proposes a preparation method and application of unfired antique green bricks based on electrolytic manganese slag. Press molding to make non-fired antique green bricks of...

AI Technical Summary

Problems solved by technology

Although the above-mentioned patents have provided many new ideas for the building materials and resource utilization of electrolytic manganese slag, the building materials prepared from electrolytic manganese slag have not been applied on a large scale in engineering.

This is mainly because a large amount of ammonia water is added in the neutralization and impurity removal stage of the electrolytic manganese metal process, resulting in a high ammonia nitrogen content in the electrolytic manganese slag, which will volatilize irritating gas during the production and utilization of building materials, which limits the use of this type of building materials. production and use

The existing dry, fire and wet treatment processes still cannot fully meet the requirements of electrolytic manganese slag as a raw material for building materials in terms of treatment cost or treatment effect

Chinese patent CN111592260A proposes a method for removing ammonia nitrogen in electrolytic manganese slag by using basic compounds as additives. By adding additives such as basic compounds, fly ash, and red mud, the soluble ammonium salts in electrolytic manganese slag with complex components converted into easily decomposed ammonia monohydrate, and then converted ammonia monohydrate into ammonia gas under the action of thermal energy and mechanical energy. Although this method can remove ammonia nitrogen in electrolytic manganese slag to a certain extent, there are still difficult Soluble ammonium salt, if this part of ammonium salt is not effectively removed, it will affect the use of electrolytic manganese slag as a building material. In addition, this patent needs to provide heat and mechanical energy, which requires high energy consumption and high cost. There are certain difficulties in engineering application

Chinese patent CN101353270A provides a method for preparing high-strength urea-formaldehyde slow-release fertilizer granules and tablets. The fertilizer is mainly composed of urea-formaldehyde, nitrogen fertilizer, phosphate fertilizer, potash fertilizer and fillers pressed in a certain proportion. The technical production process is simple and the energy consumption is low. And the slow-release effect is good, but during the preparation and use of urea-formaldehyde slow-release fertilizer, due to the presence of incompletely reacted formaldehyde in the urea-formaldehyde binder, it will introduce occupational health risks to the production environment, and the disposal of the fertilizer after losing its fertilizer effect is also a problem. big problem

In response to this problem, the present invention develops an acid-activated inorganic aluminosilicate binder, which is environmentally friendly and has high strength, and uses the binder to prepare electrolytic manganese slag-based slow-release fertilizers, which can not only effectively reduce the The phenomenon of environmental pollution and resource waste caused by manganese slag stacking can also solve technical problems such as excessive loss of fertilizer efficiency