Kieselguhr seawater potassium-extracting preparing method for multi-element long-acting compound fertilizer

Abstract

The invention discloses a kieselguhr seawater potassium-extracting preparing method for a multi-element long-acting compound fertilizer. The preparing method includes the steps that a, after old brine is added into acrid bittern, bitter salt is separated out, dehalogenation liquid is evaporated and concentrated, heat preservation clarification is carried out, and pulpy high-low-temperature salt is separated out; b, clarification liquid is cooled, the old brine is separated out, carnallite is separated out, water is added to decompose the carnallite, powdery kieselguhr is fed, the mixture is fully stirred, and potassium and other nutrient elements in decomposition liquid are adsorbed; c, the potassium-adsorbed kieselguhr is dried, then the dried potassium-absorbed kieselguhr, nitrogen and a phosphatic fertilizer are mixed in proportion to be prepared into the multi-element long-acting compound fertilizer in various grades. The compound fertilizer prepared with the method has the advantages that the technology is simple, the production cost is low, caking does not exist, transportation is convenient, contained crop nutrients are complete and not prone to losing, various pesticides can be added according to the requirement, and the compound fertilizer is suitable for both farmland and gardens.

Description

technical field [0001] The invention relates to a fertilizer manufacturing method, in particular to a compound fertilizer manufacturing method. Background technique [0002] Potassium is one of the three nutritional elements that run through the whole process of crop growth. However, due to the shortage of potassium fertilizer resources in my country, the ratio of nitrogen, phosphorus, and potassium is imbalanced, which seriously affects agricultural production and reduces crop quality. , crops and other specific conditions, the preparation of various nutrient elements in different proportions, and the appropriate combination of various fertilizer varieties can make fertilizers with poor physical properties also have the advantages of better sowing performance, so it has developed rapidly abroad. More and more attention has been paid to the application of compound fertilizers. At present, the manufacture of compound fertilizers is made by mixing nitrogen, phosphorus and potas...

AI Technical Summary

Problems solved by technology

Before the present invention, have utilized natural zeolite as adsorbent to extract potassium from bittern, then only absorb the potassium on zeolite (cold dehydration or power-on cold desorption) with nitrogen, phosphorus mixed solution under normal circumstances, deliquoring It is a high-concentration liquid fertilizer containing nitrogen, phosphorus, and potassium, which is crystallized into a crystalline compound fertilizer after drying. The manufacturing process of this kind of seawater potassium extraction and compound fertilizer is complicated and the production cost is high