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Feeding method of raw material pellets for smelting fused magnesite

A feeding method and technology of fused magnesia are applied in the field of feeding raw material pellets, which can solve the problems of high energy consumption and poor quality of fused magnesia, and achieve the effects of improving the rate of high-quality products, ensuring economic operation, and improving overall quality.

Inactive Publication Date: 2014-12-10
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to propose a fused magnesite smelting process for the problems of high energy consumption and poor quality of fused magnesia caused by the use of pellets with the same particle size in each stage of smelting in the above-mentioned existing magnesite smelting process. The feeding method of raw material pellets, in order to realize the scientific distribution of pellets, reduce energy consumption, and improve the quality of fused magnesia

Method used

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  • Feeding method of raw material pellets for smelting fused magnesite

Examples

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Embodiment 1

[0026] figure 1 It is a schematic flow chart of the electro-fused magnesium smelting method in Example 1.

[0027] This embodiment discloses a method for feeding raw material pellets for electric smelting magnesium smelting in a rotary magnesite smelting furnace with high-power automatic feeding, such as figure 1 As shown, the feeding method of the raw material pellets for electric fused magnesium smelting comprises the following steps:

[0028] (1), the magnesite is crushed, flotation to remove impurities to obtain magnesite concentrate (particle size <1mm); the magnesite concentrate, light coal powder, magnesium lignosulfonate and polyacrylamide are mixed and kneaded to produce group. The pellets are divided into large-diameter pellets and small-diameter pellets, and the particle diameter of the large-diameter pellets is greater than the particle diameter of the small-diameter pellets; specifically, the particle diameters of the large-diameter pellets in this embodiment ar...

Embodiment 2

[0034] This embodiment discloses a method for feeding raw material pellets for electro-fused magnesium smelting, which includes the following steps:

[0035] (1) Grinding the magnesite and removing impurities by flotation to obtain a magnesite concentrate (particle size < 1 mm); kneading the magnesite concentrate and a binder to make agglomerates. The pellets are divided into large-diameter pellets and small-diameter pellets; specifically, the particle diameters of the large-diameter pellets in this embodiment are: 55mm and 65mm. The particle size of small particle size pellets is: 35mm, 45mm.

[0036] (2) In the start-up stage of smelting, the use of large-size pellets for smelting can increase the gap between pellets, which is conducive to arcing between electrodes, accelerates the melting of materials, and shortens the formation time of molten pools.

[0037] (3) In the stable stage of smelting, large-sized pellets and small-sized pellets are used at the same time, and the...

Embodiment 3

[0041] This embodiment discloses a method for feeding raw material pellets for electro-fused magnesium smelting, which includes the following steps:

[0042] (1), the magnesite is crushed, flotation to remove impurities to obtain magnesite concentrate (particle size <1mm); the magnesite concentrate, light coal powder, magnesium lignosulfonate and polyacrylamide are mixed and kneaded to produce group. The pellets are divided into large-diameter pellets and small-diameter pellets, and the particle diameter of the large-diameter pellets is larger than the particle diameter of the small-diameter pellets; specifically, the particle diameter of the large-diameter pellets in this embodiment is: 60mm, 70mm. The particle size of small particle size pellets is: 30mm, 40mm.

[0043] (2) In the start-up stage of smelting, the use of large-size pellets for smelting can increase the gap between pellets, which is conducive to arcing between electrodes, accelerates the melting of materials,...

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Abstract

The invention provides a feeding method of raw material pellets for smelting fused magnesite. The method comprises the following steps: (1) carrying out crushing and floatation impurity removal on magnesite to prepare pellets, wherein the pellets are divided into large pellets and small pellets; and the large pellets are greater than the small pellets in particle size; (2) at a smelting starting stage, smelting by using the large pellets; (3) at a stable smelting stage, smelting by using the large pellets and the small pellets simultaneously, wherein the mass ratio of the large pellets to the small pellets is (3:7) to (6:4); and (4) at a smelting shutdown stage, smelting by using the small pellets. The invention discloses the particle sizes of the pellets in smelting of the fused magnesite and the particle size ratio of the pellets at all stages; therefore, economical operation of a high-power rotary smelting furnace is ensured and the overall quality of the fused magnesite product is improved.

Description

technical field [0001] The invention relates to the electric fused magnesium smelting technology, in particular to a method for feeding raw material pellets for the electric fused magnesium smelting. Background technique [0002] China is one of the countries with relatively rich magnesite resources in the world, and the distribution is relatively concentrated. Among them, Liaoning Province has rich magnesite reserves, accounting for 85% of the national total, ranking first in the country. my country's magnesite industry has developed into a unique resource-based industry with an annual output of 15 million tons of magnesia and its products, ranking first in the world. [0003] With the reduction of high-grade magnesite resources, low-grade magnesite is made into pellets after crushing, flotation and impurity removal, and then put into smelting. In order to adapt to the utilization technology of low-grade magnesite, rotary intensified smelting technology and automatic contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
Inventor 孙挺王林山韩丹崔俊峰王玉红么革崔薇薇何占高刘希洋崔毅崔军闫志刚
Owner NORTHEASTERN UNIV
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