Method for producing secondary element mineral fertilizer by activating wollastonite

A technology of mineral fertilizer and wollastonite, which is applied in the field of agricultural science, wollastonite activation and production of medium-element mineral fertilizer, can solve the problems of lack of various trace elements and lack of effective supplement of mineral nutrients, etc. To achieve the effect of reducing energy consumption, convenient material acquisition, and complete composition of medium elements

Inactive Publication Date: 2014-04-30
SOUTH CHINA UNIV OF TECH
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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

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  • Method for producing secondary element mineral fertilizer by activating wollastonite

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Embodiment 1

[0014] 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; ...

Embodiment 2

[0016] 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

[0018] 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%, of which auxiliary additive A is illite + muscovite (mass ratio 1:1); auxiliary additive B is Glauber’s salt + sodium fluoride (mass ratio 1:1), auxiliary additives A and B The weight ratio between them 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 controlled at 1050°C, and the calcination time is...

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Abstract

The invention discloses a method for producing a secondary element mineral fertilizer by activating wollastonite. The method mainly comprises the following steps: mixing wollastonite, gypsum, white clay, dolomite, an additive A and an additive B in a certain ratio; performing the procedures of stirring, drying, molding, baking, cooling and ball milling to prepare a compound fertilizer mainly containing secondary elements such as calcium, silicon, magnesium, sulfur and chlorine. In the fertilizer, the available nutrients are more than 60 percent, wherein the available calcium oxide is more than 25 percent, the available silicon dioxide is more than 20 percent, the available magnesium oxide is more than 5 percent, the available sulfur trioxide is more than 5 percent, and the available chlorine content is more than 2 percent. Moreover, multiple types of trace elements are contained, so that the fertilizer is slightly alkaline. Most of the raw materials for producing the fertilizer consist of natural minerals, so that the fertilizer has the advantages of convenience in drawing materials, low cost and the like. The product is a natural mineral compound fertilizer for regulating the acidity or the physical and chemical properties of soil in saline and alkaline land and comprehensively raising the trace element level, and has a high application value and market popularization potential.

Description

[0001] Technical field: [0002] The invention relates to the field of novel fertilizers and belongs to agricultural science. In particular, it relates to a method for activating wollastonite to produce medium element mineral fertilizer. Background technique [0003] "Food is the sky 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, silico...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D11/00
Inventor 石林
Owner SOUTH CHINA UNIV OF TECH
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