Preparation method and system of sustained-release silicon-potassium fertilizer

Abstract

The invention relates to the field of waste resource comprehensive utilization, and specifically relates to a preparation method and a preparation system of a sustained-release silicon-potassium fertilizer. The method is realized in a slag pot, and comprises the following steps: 1, preparation is carried out, wherein high-temperature blast furnace slag enters the slag pot (3); a modifier K2SO4 is added into a pressure vessel (9); and a spray gun (5) is inserted into the blast furnace slag in the slag pot (3); 2, a synthesis reaction is carried out, wherein the modifier K2SO4 is sprayed into the blast furnace slag in the slag pot (3) through the spray gun (5) with carrier gas (12); the modifier is uniformly mixed with the blast furnace slag, and is heated and molten; K2SO4 is decomposed into K2O and SO3, wherein K2O and SiO2 in the blast furnace slag are synthesized into a K2O.nSiO2 sustained-release compound; and 3, product collection is carried out, wherein SO3 gas enters a water tank (8) and is subjected to a chemical reaction with water, such that a H2SO4 solution is obtained; and the K2O.nSiO2 sustained-release compound is cooled, crushed and bagged. According to the invention, waste resources are utilized, energy is saved, and the environment is protected. The production cost is low, and the process is simple and is easy to realize.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of waste resources, and in particular relates to a manufacturing method and system of slow-release silicon-potassium fertilizer. Background technique [0002] With the accelerated development of my country's iron and steel industry, the production of steel slag has increased significantly. These waste slags not only occupy a large amount of land, but also cause serious harm to the environment. Although some achievements have been made in the comprehensive utilization of steel slag in our country, there are still many places to be improved. The main manifestations are: (1) The utilization rate of steel slag is low; (2) The added value of products produced by using steel slag is low; (3) The sensible heat of high-temperature slag has not been fully utilized. The temperature of iron and steel slag discharge is generally 1350-1650°C, which belongs to high-grade waste heat resources and has hi...

AI Technical Summary

Problems solved by technology

These methods all use the relatively expensive modifying agent potassium carbonate, resulting in higher production costs, and the current desiliconization scale of molten iron pretreatment in my country is small, the amount of desiliconization slag is not much, and the large-scale industrial production of silicon potassium fertilizer is not enough. Reality

Images