Fertilizer based on coal-fired flue gas desulfurized gypsum and fly ash and used for saline-alkali land and preparation method thereof

Abstract

The invention discloses a fertilizer based on coal-fired flue gas desulfurized gypsum and fly ash and used for a saline-alkali land and a preparation method thereof. The fertilizer comprises the following components in parts by weight: 20 to 40 parts of coal-fired flue gas desulfurized gypsum, 40 to 80 parts of fly ash, 20 to 40 parts of bentonite, 20 to 40 parts of agricultural product processingwastes, 20 to 40 parts of livestock and poultry manure and 1 to 2 parts of potassium dihydrogen phosphate. According to the invention, Ca2+ and Mg2+ in the coal-fired flue gas desulfurized gypsum replace all exchangeable sodium in the saline-alkali land, so the content of the exchangeable sodium in the saline-alkali land is reduced; the fly ash comprises a variety of inorganic substances which are necessary for the growth of plants, so a good soil environment is provided for the growth of crops; the livestock and poultry manure is an organic fertilizer capable of promoting the growth of the plants; the bentonite is used as a granulation binder, so easy granulation is realized; the agricultural product processing wastes can reduce the alkalinity of soil, so the ability of resisting salt isreinforced; a potassium sulfate compound fertilizer increases nutritional components in the soil, so the salt-tolerant capacity of the crops is improved; and the fertilizer used for the saline-alkaliland provided by the invention has the following advantages: main raw materials are from industrial and agricultural wastes; industrialization can be realized; application can be easily realized; andthe improvement efficiency of the saline-alkali land is improved.

Description

technical field [0001] The invention relates to a fertilizer for saline-alkali land, and also relates to a production method of the fertilizer for saline-alkali land. Background technique [0002] The area of ​​saline-alkali land in China is huge and has great potential for development and utilization. Among them, coastal saline-alkali land is an important type of saline-alkali land in my country, with a coastline of more than 18,000 kilometers and a relatively wide distribution. [0003] With the rapid development of my country's economy, electricity consumption is also increasing rapidly. Coal accounts for 75% of my country's primary energy consumption, of which coal-fired thermal power accounts for 1 / 3. In order to meet environmental protection requirements, thermal power plants adopt desulfurization technology on a large scale to achieve emission standards. The by-product of coal-fired flue gas desulfurization gypsum is about 10 million tons per year. Therefore, the am...

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Problems solved by technology

At the same time, thermal power coal combustion produces a larger amount of fly ash, which increased from 154 million tons in 2001 to 575 million tons in 2016, while the utilization rate of fly ash is only 20%. ~30%, unused fly ash occupies a large amount of land for storage, which poses a great threat to the ecological environment

[0004] With the development of the economy, the total amount of livestock and poultry breeding in my country continues to increase, which greatly improves the living standards of the people. However, livestock and poultry breeding produces about 3.8 billion tons of livestock and poultry manure every year, and the effective treatment rate is less than 50%, which has caused environmental damage. Huge harm, the treatment of livestock and poultry manure has also become a real problem to be solved urgently

[0005] Agricultural product processing waste is the waste generated by agricultural production. The total amount is huge, such as waste from flour mills or vegetable cold storage plants. It takes up a lot of storage space and seriously pollutes the environment. It has become a practical problem that needs to be solved urgently.