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Oxygen-free steam carbonization method for cotton straws

A cotton stalk and carbonization technology, applied in the field of resource utilization of agricultural waste, can solve the problems of poor nitrogen fixation and fertilizer efficiency, metal ion pollution, poor soil compatibility, etc., to improve soil organic carbon and total nitrogen content, carbonization Effect of low temperature and reduced nitrogen nutrition

Inactive Publication Date: 2017-06-20
北京联绿生态环境有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, in the above-mentioned prior art, carbonization is usually carried out very thoroughly, without considering many problems that arise when the obtained biochar is used for soil improvement, such as metal ion pollution, poor compatibility with soil, nitrogen fixation capacity, etc. and poor fertilizer efficiency

Method used

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  • Oxygen-free steam carbonization method for cotton straws
  • Oxygen-free steam carbonization method for cotton straws
  • Oxygen-free steam carbonization method for cotton straws

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Experimental program
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Embodiment 1

[0046] Cotton stalks were taken from Shanghe County, Jinan City. Mature cotton stalks harvested in 2015 were taken. Leaves and shells were removed, and side branches were not removed. They were stored in a ventilated and cool laboratory for later use. Cut the cotton stalks into sections with an average length of 0.8 cm, soak the cut cotton stalks in NH 4 Cl solution, soaked at 60°C for 3h, then took out the soaked cotton stalks and drained them, and placed the drained cotton stalks in a tubular heater (from Lihua Machinery Co., Gongyi City) at a temperature of 350 ℃ water vapor, pressure 0.3MPa, heating for 5h, then cooling to room temperature, taking out, fully washing the product with 35% hydrochloric acid solution, and then washing with distilled water until the pH of the washing solution is between 6-7, then drying, That is, biochar.

[0047] After testing, the SBET of the biochar = 1401m 2 / g, at P / P 0 The measured total pore volume V total = 0.91cm 3 / g, the average ...

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Abstract

The invention provides an oxygen-free steam carbonization method for cotton straws. The method comprises the following steps: cutting the cotton straws into section materials, immersing the cotton straw section materials in an NH4Cl solution, taking out the immersed cotton straw section materials, draining off the section materials, putting the drained-off cotton straw section materials into a container, carrying out steam heating for carbonization, cooling to room temperature, washing and drying, thus obtaining biomass charcoal. The biomass charcoal obtained through the method is large in specific surface area, good in pore structure and high in organic carbon content, and has a good improvement effect when used for soil improvement.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of agricultural waste, and in particular relates to an oxygen-free steam carbonization method of cotton stalks. Background technique [0002] Cotton is a very important economic crop. It is also an important industrial raw material. Cotton is widely planted in my country and is the largest cotton producing country in the world. my country's cotton production accounts for more than 1 / 4 of the world's cotton production. While producing cotton, it also produces a large amount of cotton stalk waste. According to statistics, more than 50% of straws in my country are discarded or burned, causing serious waste of resources and environmental pollution. If these abundant waste straws can be effectively utilized, it will not only turn waste into wealth and benefit the people, but also improve the comprehensive economic benefits of cotton planting. In recent years, there have been many researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342C05D9/00C05G3/04C09K17/02C05G3/80
CPCC05D9/00C05G3/80C09K17/02
Inventor 朱明刘涵王吉峰
Owner 北京联绿生态环境有限公司
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