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Lignin iron powder ball compound adhesive and preparation method thereof

A technology of lignin and binder, which is applied in the field of lignin iron powder pellet composite binder and its preparation, can solve the problems of decreased mechanical strength, damage and pulverization, etc.

Inactive Publication Date: 2018-11-23
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature exceeds 400°C, the mechanical strength of the pellets decreases with the gradual decomposition of the binder, causing the pellets to be damaged and pulverized under the pressure in the furnace.

Method used

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  • Lignin iron powder ball compound adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A certain mass of alkali lignin is taken and dissolved in 1% NaOH solution according to the solid-to-liquid ratio of 1:50 (m / v). Adjust the pH value of the lignin solution to 10, filter to remove insoluble impurities, and concentrate with an ultrafiltration membrane with a molecular weight cut-off of 10,000 Da to obtain a large molecular weight lignin solution. Adjust the pH of the large molecular weight lignin solution to 3 with HCl solution, centrifuge and wash the lignin precipitate to remove sodium chloride, and obtain a large molecular weight lignin raw material free of sulfur and alkali metal. Fully stir and mix lignin, oxidized starch and flux according to the ratio of: 25 parts of lignin, 15 parts of oxidized starch, 25 parts of lime powder, 8 parts of magnesium oxide, 7 parts of magnesium chloride, and 20 parts of water to obtain 20% water content Iron powder pellet binder. The above-mentioned binder is added into the iron powder according to 12% of the mass o...

Embodiment 2

[0015] A certain mass of alkali lignin is taken and dissolved in 1% NaOH solution according to the solid-to-liquid ratio of 1:50 (m / v). Adjust the pH value of the lignin solution to 9, filter to remove insoluble impurities, and concentrate with an ultrafiltration membrane with a molecular weight cut-off of 10,000 Da to obtain a large molecular weight lignin solution. Adjust the pH of the large molecular weight lignin solution to 2 with HCl solution, centrifuge and wash the lignin precipitate to remove sodium chloride, and obtain a large molecular weight lignin raw material free of sulfur and alkali metals. Fully stir and mix lignin, oxidized starch and flux according to the ratio of: 30 parts of lignin, 10 parts of oxidized starch, 25 parts of lime powder, 10 parts of magnesium oxide, 10 parts of magnesium chloride and 15 parts of water to obtain 15% water content Iron powder pellet binder. The above-mentioned binder is added into the iron powder according to 10% of the mass ...

Embodiment 3

[0017] A certain quality of ethanol lignin is taken and dissolved in 2% NaOH solution according to the solid-to-liquid ratio of 1:40 (m / v). Adjust the pH value of the lignin solution to 9, filter to remove insoluble impurities, and concentrate with an ultrafiltration membrane with a molecular weight cutoff of 6000 Da to obtain a large molecular weight lignin solution. Adjust the pH of the large molecular weight lignin solution to 2 with HCl solution, centrifuge and wash the lignin precipitate to remove sodium chloride, and obtain a large molecular weight lignin raw material free of sulfur and alkali metals. Fully stir and mix lignin, oxidized starch and flux according to the ratio of: 25 parts of lignin, 15 parts of oxidized starch, 20 parts of lime powder, 15 parts of magnesium oxide, 10 parts of magnesium chloride and 15 parts of water to obtain 15% water content Iron powder pellet binder. Add the above-mentioned binder into the iron powder according to 7% of the mass of th...

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Abstract

The invention discloses a lignin iron powder ball compound adhesive and a preparation method thereof. The iron powder ball adhesive is prepared from the following ingredients of sulfur-free large molecular weight lignin, oxidized starch and an inorganic fluxing agent. The adhesive is added into an iron powder raw material according to a certain proportion to be fully and evenly stirred, the defined amount of water is sprayed to form a mixture with viscosity, and the mixture is put into a ball pressing machine to be manufactured into iron powder balls. The iron powder balls are sent into a drying stove and pass through a low-temperature area, a middle-temperature area and a high-temperature area to be dried and roasted to be solidified into the iron powder balls with certain strength. As the iron powder adhesive use amount is larger, the large molecular weight lignin without sulfur and alkali metal is utilized as a main ingredient of the iron powder ball adhesive disclosed by the invention; thus, an effective path is provided for application of bulk lignin raw materials.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and casting, and particularly relates to a lignin iron powder pellet composite adhesive and a preparation method thereof. Background technique [0002] In the current iron and steel production process, in order to ensure uniform iron content in the iron ore supplied to the blast furnace, improve the metallurgical properties of the iron ore, meet the quality requirements of the iron ore for blast furnace smelting, and ensure the air permeability of the blast furnace, it is necessary to The iron ore concentrate produced by the process is made into 10-25mm block raw materials. Based on this, it is necessary to mix various iron concentrates or finely ground natural ores with a pellet binder and an appropriate amount of water to make green pellets, and then roast them at high or low temperature to form pellets. [0003] The key to pelletizing is to prepare a binder that has high bonding performa...

Claims

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Application Information

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IPC IPC(8): C22B1/244
CPCC22B1/244C22B1/2406
Inventor 王冠华司传领刘晓倩
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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