Method for preparing mineral potash fertilizer with potassium feldspar

Abstract

The invention discloses a method for preparing a mineral potash fertilizer with potassium feldspar, wherein the method uses potassium feldspar as raw material and phosphates ore as assistant, and comprises crushing, mixing, mechanical force chemical reaction, neutralizing, separating and drying, wherein the mixing is to mix the potassium feldspar powder and phosphates ore, which have a fineness of 100-400 meshes, based on a mass ratio of 1: 0.5-2.5, and add inorganic acid with a mass percentage concentration of 25-60%, and perform the mechanical force chemical reaction for 2-5 h, wherein the liquid to solid ratio of the inorganic acid to the ore powder is 1-5 ml / g (ore powder); the inorganic acid is chosen from phosphoric acid, hydrochloric acid or nitric acid. The method transforms the phosphorus and potassium in the raw material into effective phosphorus and potassium (comprising quick-acting phosphorus and potassium, and long-acting phosphorus and potassium), which can be absorbed by the crops. The quick-acting phosphorus and potassium in the product take up 20-90% of the effective phosphorus and potassium and can be adjusted, wherein the rest is long-acting phosphorus and potassium. The total use ratio of the phosphorus and potassium in the raw material is over 80%.

Description

1. Technical field [0001] The invention relates to a preparation method of multi-element inorganic compound fertilizer, specifically a method for preparing mineral potassium fertilizer at normal temperature and pressure by using potassium feldspar as raw material and phosphate rock as auxiliary agent. 2. Background technology [0002] Potassium resources in my country are not rich, and soluble potassium resources are seriously insufficient. Potassium feldspar is the main raw material for the preparation of inorganic potash fertilizers. At present, the more typical potassium extraction processes are: (1) High temperature reaction system: including sintering method, high temperature melting method and blast furnace smelting method. The high-temperature reaction system refers to mixing potassium feldspar with additives or additives according to the ratio and then reacting at a temperature of about 900-1500°C to convert insoluble potassium into soluble or citrate-soluble potass...

AI Technical Summary

Problems solved by technology

This method greatly reduces energy consumption, but due to the strong corrosiveness of fluorine-containing compounds in the production process, the investment cost of equipment is greatly increased, and at the same time it will cause serious pollution to the environment, making industrialization very difficult

(3) Microbial decomposition system: Microbial decomposition technology is a modern biological method that uses microbial strains and potassium feldspar to undergo biochemical reactions to decompose potassium feldspar. It has the characteristics of short process flow and low pollution, but its outstanding disadvantage is that bacteria The viability of the species is weak, the cycle of strain cultivation is too long, the decomposition rate is too slow, and the dissolution rate of potassium is too low, making it impossible to realize large-scale industrial production at present.