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Method for producing secondary element acid-soil conditioning agent by using industrial calcium silicate board waste materials

A technology of acidic soil and industrial silicon, applied in soil conditioning materials, chemical instruments and methods, applications, etc., can solve the problems of heavy metal pollution, large fluctuations, unstable components, etc., and achieve complete middle element components and convenient material collection , the effect of energy consumption reduction

Active Publication Date: 2013-12-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] Although the above conditioners can improve the acidic soil to a certain extent, there are the following problems: (1) Most of them are primary raw materials, and the production and processing process is simple and rough, and the effective The ingredient content is not high and fluctuates greatly, and some also have the problem of too strong alkalinity
Because these substances are mostly insoluble, this has just caused the content of active ingredients in the conditioner to be low, the content fluctuates greatly and the composition is unstable, and the alkalinity of lime is too strong, which will bring harm to the growth of crops; (2) often Can cause soil compaction or heavy metal pollution
For example, a large amount of lime, limestone, and dolomite will cause soil compaction; phosphogypsum, phosphate rock powder, and fly ash all contain a certain amount of heavy metals and radioactive elements such as lead, cadmium, mercury, arsenic, and chromium, which will affect the soil- --Crops---Hazards to food safety
[0023]As a new type of building material, industrial silicon-calcium board is widely used in the building materials industry, but as a raw material for the preparation of acidic soil conditioners with medium elements, there are few studies at home and abroad

Method used

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  • Method for producing secondary element acid-soil conditioning agent by using industrial calcium silicate board waste materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A fertilizer company is a large state-owned enterprise that produces compound fertilizers. Using this process to produce medium-element acidic soil conditioner can be added to compound fertilizers as additives to make its nutritional components more comprehensive and balanced, and the production cost has dropped by nearly 55%. Its process is as figure 1 shown. The mineral raw materials (according to the mass percentage) are compatible as follows: 50% of silicon-calcium board waste, 37% of white mud, 12% of dolomite, and 1% of auxiliary additives A and B, of which auxiliary additive A is potassium feldspar+ Muscovite (mass ratio 1:1); auxiliary additive B is Glauber's salt + salt (mass ratio 1:1), and the weight ratio between auxiliary additives A and B is also 1:1. Fully mix the above mineral raw materials, and perform ball milling until the particle size is less than 0.074mm; then dry the mixed material until the moisture content is less than 5%; shape and process th...

Embodiment 2

[0038] A fertilizer company in Shanxi adopts this process to produce medium-element acidic soil conditioner. The material (according to mass percentage) compatibility is: 37% of silicon-calcium board waste, 51% of white mud, 10% of dolomite, and additives A and B are 2 %, where additive A is illite + potassium carbonate (mass ratio 1:1); additive B is salt + sodium fluoride (mass ratio 1:1), and the mass ratio between 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 and activation, the temperature is controlled at 950°C, and the roasting time is 1.5 hours. The activated spheres are cooled and crushed to make mineral nutrition acidic soil conditioner. Among them, throug...

Embodiment 3

[0040] A fertilizer company in Guangdong is a large private enterprise that produces soil conditioners. Using this process to produce medium-weight element conditioner, the production cost has dropped by nearly 51%. The raw materials used (according to mass percentage) are: 60% of silicon-calcium board waste, 28% of white mud, 11% of dolomite, and 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), and the ratio between auxiliary additives A and B The mass ratio is 1:0.75. The process flow is as follows: fully mix the above mineral raw materials, and perform ball milling until the particle size is less than 0.074mm; then dry the mixed material until the moisture content is less than 5%; the dried powder is formed into a particle size of about 2cm pellets, and enter the activation kiln for calcination and activation, the temperature is controlled at ...

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Abstract

The invention discloses a method for producing a secondary element acid-soil conditioning agent by using industrial calcium silicate board waste materials. The method mainly comprises the following steps of: mixing calcium silicate boards, white mud, dolomite and the like as well as additives A and B, ball-milling, drying, forming, machining, baking, activating, cooling and crushing, thus obtaining the mineral substance nutritional type acid-soil conditioning agent. The acid-soil conditioning agent comprises more than 60% of available nutrients, more than 25% of available calcium oxide, more than 20% of available silicon dioxide, more than 5% of available magnesium oxide, more than 5% of available sulfur trioxide, more than 2% of available chlorine and multiple trace element components. The secondary element acid-soil conditioning agent is weakly basic (pH is 9-12). The method belongs to the subject of the high-efficiency agriculture resource utilization of industry soil wastes and covers the scientific idea of circular economy and sustainable development. The prepared acid-soil conditioning agent can be used for adjusting the physical and chemical property of acid or saline-alkali soil and comprehensively increasing the level of the medium trace elements in the soil.

Description

technical field [0001] The invention relates to the field of novel fertilizers and belongs to agricultural science. Specifically, it relates to a method for activating industrial silicon-calcium board waste to produce a medium-element acidic soil conditioner. Background technique [0002] Soil pH is very important for plant growth. Most crops thrive in neutral soil with a pH of 7 or slightly less. Soil acidification (soil acidification) refers to the process of increasing the concentration of hydrogen ions in the soil or increasing the acidity of the soil, which is manifested by a significant decrease in the pH value of the soil, forming acidic soil, affecting the activity of organisms in the soil, changing the form of nutrients in the soil, and reducing the amount of nutrients in the soil. The effectiveness of the solution promotes the dissolution of free manganese and aluminum ions into the soil solution, causing toxicity to crops. In nature, acidic soils account for ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08C09K109/00
Inventor 石林
Owner SOUTH CHINA UNIV OF TECH