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Silicon fertilizer and its producing method

A silicon fertilizer and silicon oxide technology, applied in inorganic fertilizers, calcareous fertilizers, fertilization devices, etc., can solve problems such as crops being blown down by strong winds, unable to resist withering and pest damage, and cold climate damage.

Inactive Publication Date: 2005-04-06
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the content of this ingredient is small, the crop is likely to be blown over by strong winds and will not be able to resist blight and pest damage, as well as damage from cold climates.

Method used

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  • Silicon fertilizer and its producing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Hereinafter, the present invention will be described more specifically with reference to examples thereof.

[0046] In the converter, the calcium oxide powder is directly blown into the molten pig iron through the nozzle together with oxygen, and the molten pig iron contains S: 0.024% and Si: 0.65%, without desulfurization and desiliconization preparatory treatment, so as to desulfurize the molten pig iron Silicon and dephosphorization. The slag having an alkalinity of 2.1 was collected, then pulverized and granulated, thereby obtaining silicon fertilizer A described in Table 1 below.

[0047] Similarly, the amount of calcium oxide powder blown and added to molten pig iron was varied, and desiliconization and dephosphorization treatments were performed. Collect the slag that basicity is 2.6,1.6 and 1.8, thereby obtain the silicon fertilizer B, C and G that have said composition in table 1 below.

Embodiment 2

[0049] Calcium oxide and aluminum ash were added to molten pig iron containing S: 0.036% and Si: 0.88% and stored in torpedo carts. Preliminary desulfurization is carried out and the slag formed is removed. Oxygen is then blown into the molten pig iron that has been desulfurized and charged in the converter, and preliminarily desiliconized. The slag formed is subsequently removed. Calcium oxide was blown together with oxygen through the nozzle into the formed molten pig iron containing S: 0.007% and Si: 0.15%. The slag with a basicity of 2.0 was collected and crushed. After the addition of phosphorus oxide soluble in citric acid, the slag was granulated to form silicon fertilizer D having the composition stated in Table 1.

[0050] Similarly, the amount of calcium oxide powder blown and added to the pretreated molten pig iron was varied, and desiliconized and dephosphorized were performed. The slags with reductions of 1.6 and 2.7 were collected and crushed. After adding p...

Embodiment 3

[0053] Operations are carried out using ore with a relatively high phosphorus content as iron ore for use in blast furnaces. Calcium oxide and aluminum ash were added to molten pig iron containing P: 0.140%, S: 0.036% and Si: 0.40% and stored in a torpedo car for preliminary desulfurization treatment. The slag formed is removed.

[0054] Next, oxygen is blown into the molten pig iron that has been desulfurized and charged into the converter for preparatory desiliconization, and the resulting slag is removed. After preliminary treatment, calcium oxide powder was blown together with oxygen into molten pig iron containing P: 0.140%, S: 0.007% and Si: 0.15% through a nozzle, and the molten pig iron was desiliconized and dephosphorized. The slag with a basicity of 2.9 was collected and pulverized. In this way, a phosphorus oxide slag containing 6.0% soluble in citric acid can be obtained. The slag was granulated to obtain silicon fertilizer H as shown in Table 1.

[0055] ...

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Abstract

This invention provides a silicic fertilizer using a slag produced in a preliminary treatment of a molten pig iron and imparted with a high soluble silica content, and a production method of such a silicic fertilizer. CaO is added and oxygen is blown into a molten pig iron while adjusting a basicity (CaO / SiO2) to 3 or below, and the molten pig iron is subjected to desiliconization and dephosphorization. The resulting slag is collected to produce the silicic fertilizer. This silicic fertilizer has a basicity (CaO / SiO2) of not greater than 3 and contains 15 to 35 mass % of soluble silica.

Description

technical field [0001] The present invention relates to a kind of silicon fertilizer, which is mainly produced by adopting the converter slag mostly produced by the pretreatment of molten pig iron, and also relates to the manufacturing method of the silicon fertilizer. Background technique [0002] According to the present invention, the term "pretreatment" or "primary treatment" generally includes desulphurization, desiliconization and dephosphorization of molten pig iron, and also preparatory treatment to adjust the silicon and / or sulfur content contained in molten pig iron (if When these contents are higher), and also a further main treatment including desiliconization and dephosphorization by adding calcium oxide to the molten pig iron and blowing oxygen. [0003] According to the invention, the term "preparatory treatment" includes desulfurization and desiliconization treatments to adjust the silicon and / or sulfur content contained in the molten pig iron (if these are h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C05D3/04C05D9/00C05D11/00C05G1/00C21C1/02
Inventor 岩崎正树吹上和德松本周
Owner NIPPON STEEL CORP
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