Method for producing liquid fertilizer containing secondary trace elements by water washing treatment of blast furnace slag

Abstract

The invention relates to a method for producing a liquid fertilizer containing secondary trace elements by water washing treatment of blast furnace slag. The method is as below: subjecting blast furnace slag generated after steelmaking in an integrated steelmaking plant to water washing treatment, sending the mud slurry to a mud slurry separation tank to filter, separating fine materials and clarified liquid from the mud slurry separation tank, taking out the clarified liquid, conducting low concentration extraction water, and separating out purified water and the liquid fertilizer. Through the simple, low-cost and pollution-free process, alkaline liquid fertilizer rich in trace elements can be prepared; the liquid fertilizer after dilution can be used for fast absorption by plants, in order to facilitate the growth of plants; the liquid fertilizer can also be used as a biological antibacterial agent to substitute the use of lime, and can filter into the soil to effectively improve soil acidification and depletion.

Description

technical field [0001] The invention relates to a method of washing blast furnace slag with water to produce liquid fertilizer containing secondary trace elements, especially a method with simple process, low cost and no pollution, which can produce alkaline fertiliser rich in secondary trace elements method of liquid fertilizer. Background technique [0002] Nowadays, most of the crops use a large amount of chemical fertilizers and pesticides to increase the yield of crops per unit area. However, the use of a large amount of chemical fertilizers and pesticides will cause environmental damage, such as: soil acidification and fertility reduction, soil organic matter reduction, increase in the number of drug-resistant pests and environmental pollution, which will lead to a decline in agricultural production, coupled with the large amount of modern industrial waste gas Contains nitrogen and sulfide. When it comes into contact with the moisture in the air, it will generate acid...

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Problems solved by technology

[0003] When studying fish farming, in order to improve the problems of fish and shrimp virus infection in the culture pond, the deterioration of the bottom mud of the culture pond, and the deterioration of water quality, agricultural quicklime is usually used to solve the above problems, such as renewing the bottom mud of the culture pond, but these The methods are still unable to effectively deal with the deterioration of the ecology and bottom sediment in the aquaculture pond

As the fish grows, their excrement and fish feed will deteriorate the water quality and sediment in the tank. Usually, the way of dosing is used to solve the problem of water quality and sediment deterioration, but a large amount of dosing will cause drug residues, which will lead to The problem of harm to humans and virus resistance. For the problem of virus resistance, people usually use more toxic formulations of drugs to administer drugs, but this will cause longer-term damage to the natural environment of the soil and humans.

[0004] In addition, it is found in the research that sub-trace elements are beneficial to the growth of plants. Therefore, people in the industry have carried out the research and development and manufacture of liquid fertilizers containing sub-trace elements. However, in the existing manufacturing methods of liquid fertilizers containing sub-trace elements Among them, its raw materials are mainly taken from ore. In the process, the ore must be calcined at high temperature, then crushed, ground into powder, and then subjected to centrifugal treatment before the ore can be dissolved in water. Therefore, the process must be It consumes a lot of energy, and at the same time, in the process of crushing and grinding ore into powder, it will cause environmental dust pollution, and the fine dust in the air will cause serious damage to the human respiratory organs. In addition, the fine dust will be scattered with the air , thereby increasing the scope of its pollution

Some people in the industry use the method of strong acid extraction to obtain important components such as calcium oxide, magnesium oxide, and iron ions needed for plant growth from minerals. However, after the waste water of the strong acid solution is discharged into the soil and rivers, the soil and river pollution, over time, the overall ecological environment will be seriously damaged

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