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Method for producing secondary element mineral fertilizer by activating wollastonite

A technology of mineral fertilizer and wollastonite, which is applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of lack of various trace elements and the lack of effective supplementation of mineral nutrients, so as to reduce energy consumption and obtain materials. Convenient and low-cost effect

Active Publication Date: 2015-06-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the acidic soil areas in the south, these mineral nutrients have not been effectively supplemented for a long time. In addition to the leaching of these nutrients by acidic precipitation and the absorption of crops, these mineral elements are very deficient in the soil. According to Guangdong Provincial Agricultural According to the data of the Academy of Sciences: At present, the potassium deficiency in the soil in Guangdong is more than 90%, the lack of silicon, calcium, magnesium, sulfur, etc. is maintained at around 50%, and there is a lack of various trace elements

Method used

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  • Method for producing secondary element mineral fertilizer by activating wollastonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A fertilizer company is a large state-owned enterprise that produces nitrogen, phosphorus and potassium compound fertilizers. Using this process to produce medium-weight element fertilizers and adding them to nitrogen, phosphorus, and potassium compound fertilizers as additives can make the original compound fertilizers more comprehensive in composition, more balanced in nutrition, and reduce production costs by nearly 55%. Its main process is as figure 1 shown. The mineral raw materials (according to mass percentage) are compatible as follows: 50% wollastonite, 12% gypsum, 25% white mud, 12% dolomite, 1% of auxiliary additives A and B, of which auxiliary additive A is potassium Feldspar + muscovite (mass ratio 1:1); auxiliary additive B is thenardite + salt (mass ratio 1:1), and the weight ratio between auxiliary additives A and B is also 1:1. The process flow is: fully mix the above mineral raw materials, and ball mill until the particle size is less than 0.074mm; t...

Embodiment 2

[0014] A fertilizer company in Shanxi adopts this process to produce medium-weight element fertilizers. The material (according to mass percentage) compatibility is: wollastonite 37%, gypsum 25%, white mud 26%, dolomite 10%, additives A and B are 2 %, wherein auxiliary additive A is illite + potassium carbonate (mass ratio 1:1); auxiliary additive B is salt + sodium fluoride (mass ratio 1:1), and the weight ratio between auxiliary additives A and B is 1 :2. The process flow is as follows: fully mix the above mineral raw materials, and perform ball milling until the particle size is less than 0.090mm; then dry the mixed material until the moisture content is less than 6%; shape the dried mixed material into a particle size About 1.5cm pellets, and enter the activation kiln for roasting, the temperature is controlled at 950 ° C, and the roasting time is 1.5 hours. The activated pellets are cooled and crushed to make mineral compound fertilizers. Among them, through the third-p...

Embodiment 3

[0016] A fertilizer company in Guangdong is a large private enterprise that produces soil conditioners. Using this process to produce medium elements, the production cost has dropped by nearly 51%. The mineral raw materials used (in terms of mass percentage) are compatible with: 60% wollastonite, 10% gypsum, 20% white mud, and 9% dolomite. , auxiliary additives A and B are 1% (the sum of these substances is 100%), in which auxiliary additive A is illite + muscovite (mass ratio 1:1); auxiliary additive B is mirabilite + sodium fluoride ( The mass ratio is 1:1), and the weight ratio between auxiliary additives A and B is also 1:0.75. The process flow is: fully mix the above mineral raw materials, and ball mill until the particle size is less than 0.074mm; then dry the mixed material until the moisture content is less than 5%; shape the dried mixed material into a particle size of about 2cm The pellets are put into the activation kiln for calcination, the temperature is controll...

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Abstract

The invention discloses a method for producing medium element mineral fertilizer by activating wollastonite. Its main content is to mix wollastonite, gypsum, white mud, dolomite, etc. and auxiliary additives A and B in a certain proportion, and use processes such as stirring, drying, molding, roasting, cooling, and ball milling to prepare calcium, Compound fertilizer mainly composed of silicon, magnesium, sulfur, chlorine and other medium elements. The effective nutrients in the fertilizer are greater than 60%, of which the effective calcium oxide is greater than 25%, the effective silicon dioxide is greater than 20%, the effective magnesium oxide is greater than 5%, the effective sulfur trioxide is greater than 5%, the available chlorine content is greater than 2%, and contains more A variety of trace elements, the fertilizer is weakly alkaline. The production raw materials of the present invention are mostly composed of natural minerals, which have the advantages of convenient materials and low cost. The product is a natural mineral compound fertilizer used to adjust the physical and chemical properties of acidic or saline-alkali soil and comprehensively improve the level of trace elements. High application value and market promotion potential.

Description

technical field [0001] The invention relates to the field of novel fertilizers, in particular to a method for activating wollastonite to produce medium-element mineral fertilizers. Background technique [0002] "Food is the heaven of the people, and soil is the foundation of food." In recent decades, my country's agriculture has also been rapidly improved, but the agricultural resources and environment are undergoing profound changes, especially the soil environment. Due to long-term unreasonable fertilization methods, especially the large-scale application of chemical fertilizers and nitrogen fertilizers, atmospheric acid deposition and intrusion of industrial pollutants, soil compaction, soil poisoning, soil-borne diseases, soil acidification, soil salinization, etc. have become more and more serious. The imbalance of nutrient elements and acidification are the main causes, including the overall lack of calcium, silicon, magnesium, sulfur, chlorine and other medium elemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00
Inventor 石林
Owner SOUTH CHINA UNIV OF TECH