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Oyster-shell soil conditioner, preparation method thereof and application of oyster-shell soil conditioner in rice planting

A technology of soil conditioner and oyster shell, which is applied in the field of oyster shell soil conditioner and its preparation, can solve the problems of unfavorable soil fertilization, high energy consumption, and high calcination temperature, and achieve the reduction of effective cadmium content and rice cadmium content , Improve the effect of microporous structure

Pending Publication Date: 2018-11-16
JIMEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the use of oyster shells to improve soil has the problems of high calcination temperature and high energy consumption, and the distribution of micropore structure of oyster shells calcined at high temperature is not uniform, which affects the improvement effect
If the temperature is lowered, the decomposition of calcium carbonate is insufficient, the microporous structure of oyster shells is difficult to form, and the content of calcium oxide in the product is low, which is not good for soil fertilization

Method used

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  • Oyster-shell soil conditioner, preparation method thereof and application of oyster-shell soil conditioner in rice planting
  • Oyster-shell soil conditioner, preparation method thereof and application of oyster-shell soil conditioner in rice planting
  • Oyster-shell soil conditioner, preparation method thereof and application of oyster-shell soil conditioner in rice planting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) The oyster shells are sent into a high temperature furnace, firstly heated to 500°C at a heating rate of 20°C / min, kept for 10min, then heated to 1000°C at a temperature rise rate of 20°C / min, kept for 10min, and naturally cooled to room temperature Obtain stepped high temperature calcined oyster shells.

[0032] (2) Take and dry the fish and shrimp processing wastes to obtain organic matter.

[0033] (3) Mix 70 parts of oyster shells calcined at high temperature in a stepwise manner and 30 parts of organic matter, pulverize with an ultrafine pulverizer, and mix them evenly to prepare a mixture.

[0034] (4) the mixture of the previous step gained is input into the drum granulator to carry out steam granulation, the particle diameter is blown into the dryer with hot air after 1-2mm to dry the particles, and then continues to carry out steam granulation, the particle diameter After 4-5mm, the granules are dried by blowing hot air into the dryer to obtain the oyster ...

Embodiment 2

[0037] (1) The oyster shells are sent into the high-temperature furnace, firstly heated to 450°C at a heating rate of 20°C / min, maintained for 10min, then heated to 1030°C at a temperature increase rate of 20°C / min, maintained for 10min, and naturally cooled to room temperature Obtain stepped high temperature calcined oyster shells.

[0038] (2) The wastes from the shell and algae processing process are dried to obtain organic matter.

[0039] (3) Mix 75 parts of oyster shells calcined at a high temperature in a stepwise manner and 25 parts of organic matter, pulverize with an ultrafine pulverizer, and mix uniformly to prepare a mixture.

[0040] (4) the mixture of the previous step gained is input into the drum granulator to carry out steam granulation, the particle diameter is blown into the dryer with hot air after 1-2mm to dry the particles, and then continues to steam granulation, the particle diameter After 4-5mm, the granules are dried by blowing hot air into the dryer...

Embodiment 3

[0042] (1) The oyster shells are sent into the high-temperature furnace, firstly heated up to 530°C at a heating rate of 20°C / min, kept for 10 minutes, then heated to 980°C with a heating rate of 20°C / min, kept warm for 10 minutes, and naturally cooled to room temperature Obtain stepped high temperature calcined oyster shells.

[0043] (2) Dry the waste from the poultry breeding process to obtain organic matter.

[0044] (3) Mix 70 parts of oyster shells calcined at a high temperature in a stepwise manner and 30 parts of organic matter, pulverize with an ultrafine pulverizer, and mix evenly to prepare a mixture.

[0045] (4) the mixture of the previous step gained is input into the drum granulator to carry out steam granulation, the particle diameter is blown into the dryer with hot air after 1-2mm to dry the particles, and then continues to steam granulation, the particle diameter After 4-5mm, the granules are dried by blowing hot air into the dryer to obtain the oyster shel...

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Abstract

The invention relates to an oyster-shell soil conditioner, a preparation method thereof and application of the oyster-shell soil conditioner in rice planting. Step-wise high temperature calcination isconducted on oyster shells, wherein the step-wise high temperature calcination comprises two calcination temperatures: a first calcination temperature and a second calcination temperature, the firstcalcination temperature is 300-550 DEG C, and the second calcination temperature is 900-1200 DEG C. According to the oyster-shell soil conditioner, by adopting step-wise high temperature calcination,the effect of soil modification by oyster shell can be improved significantly, the content of effective cadmium in rice soil can be reduced, the pH value of the soil can be improved, and the content of cadmium in the rice can be reduced significantly.

Description

technical field [0001] The invention relates to soil improvement and restoration technology, in particular to an oyster shell soil conditioner, a preparation method thereof, and an application in rice cultivation. Background technique [0002] At present, the area of ​​acidified soil in my country has reached 200 million hectares, accounting for about 23% of the total area of ​​the country. It is mainly distributed in 14 provinces and autonomous regions south of the Yangtze River. The proportion of soil with pH<6.5 has increased from 52% 30 years ago to 65%. The soil pH<5.5 was expanded from 20% to 40%, and the soil pH<4.5 was expanded from 1% to 4%. Soil acidification will lead to the loss of nutrients in the soil, the increase of the solubility of toxic heavy metal compounds, the decrease of soil fertility, and the deterioration of soil structure, which will affect the growth and development of crops on the ground, which has seriously restricted the food security a...

Claims

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Application Information

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IPC IPC(8): C09K17/40A01G22/22C05G3/04C09K101/00C09K109/00C05G3/80
CPCA01G22/22C09K17/40C09K2109/00C09K2101/00C05G3/80
Inventor 曹敏杰章骞庄益中翁凌刘光明
Owner JIMEI UNIV
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