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Method of producing converter dephosphorization agent by using alumina tailings (red mud)

A converter dephosphorization agent and alumina technology, applied in the field of metallurgical charge, can solve the problems of wasting the environment, the red mud cannot be efficiently utilized, pollution, etc., and achieve the effects of reducing splashing, significant dephosphorization effect and simple steps.

Active Publication Date: 2017-07-04
武汉振海科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing converter dephosphorization agent from alumina tailings (red mud), which is used to solve the problem of middle-grade iron or low-grade iron in the existing Bayer process for alumina production The red mud cannot be used efficiently, resulting in waste and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] S1 Preparation of magnetic separation red mud:

[0054] The raw material red mud is magnetically separated to obtain the magnetically separated red mud.

[0055] The composition of the selected raw material red mud in the present embodiment comprises: SiO 2 The parts by weight is 15.0 parts, Al 2 o 3 The parts by weight are 15.0 parts, Na 2 The parts by weight of O is 8.0 parts, Fe 2 o 3 The parts by weight is 50.0 parts, TiO 2 The parts by weight are 3.0 parts.

[0056] The magnetic separation red mud composition obtained by magnetic separation of PYG-15 magnetic separator includes: the weight part of CaO is 3.0 parts, SiO 2 The parts by weight is 15.0 parts, Al 2 o 3 The parts by weight is 15.0 parts, R 2 The parts by weight of O is 5.0 parts, Fe 2 o 3 The parts by weight is 65.0 parts, TiO 2 The parts by weight are 2.0 parts.

[0057] S2 prepares the dephosphorization agent precursor:

[0058] Calcium aluminate is added to the above magnetic separation...

Embodiment 2

[0066] S1 Preparation of magnetic separation red mud:

[0067]The raw material red mud is magnetically separated to obtain the magnetically separated red mud.

[0068] The composition of the selected raw material red mud in the present embodiment comprises: the parts by weight of CaO is 5.0 parts, SiO 2 The parts by weight is 5.0 parts, Al 2 o 3 The parts by weight is 10.0 parts, Na 2 The parts by weight of O is 10.0 parts, Fe 2 o 3 The parts by weight is 45.0 parts, TiO 2 The parts by weight are 2.0 parts.

[0069] The magnetic separation red mud composition obtained by magnetic separation of PYG-15 magnetic separator includes: the weight part of CaO is 8 parts, SiO 2 The parts by weight are 12 parts, Al 2 o 3 The parts by weight are 17.0 parts, Na 2 The parts by weight of O is 6.0 parts, Fe 2 o 3 The parts by weight is 55.0 parts, TiO 2 The parts by weight are 2.0 parts.

[0070] S2 prepares the dephosphorization agent precursor:

[0071] Calcium aluminate is ...

Embodiment 3

[0079] S1 Preparation of magnetic separation red mud:

[0080] The raw material red mud is magnetically separated to obtain the magnetically separated red mud.

[0081] The composition of the selected raw material red mud in the present embodiment comprises: the parts by weight of CaO is 3.2 parts, SiO 2 The parts by weight is 5.0 parts, Al 2 o 3 The parts by weight is 10.0 parts, Na 2 The parts by weight of O is 10.0 parts, Fe 2 o 3 The parts by weight is 50.0 parts, TiO 2 The parts by weight are 2.5 parts.

[0082] The magnetic separation red mud composition obtained by magnetic separation of PYG-15 magnetic separator includes: the weight part of CaO is 13.0 parts, SiO 2 The parts by weight is 5.0 parts, Al 2 o 3 The parts by weight are 12.0 parts, Na 2 The parts by weight of O is 3.7 parts, Fe 2 o 3 The parts by weight is 62.0 parts, TiO 2 The parts by weight are 1.3 parts.

[0083] S2 prepares the dephosphorization agent precursor:

[0084] Calcium aluminate...

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Abstract

The invention discloses a method of producing a converter dephosphorization agent by using alumina tailings (red mud). The method comprises the following steps: S1, preparation of magnetic separation red mud: raw red mud is subjected to magnetic separation and the magnetic separation red mud is obtained; S2, preparation of a dephosphorization agent precursor: calcium aluminate and calcium carbonate are added to the magnetic separation red mud and mixed, and the dephosphorization agent precursor is formed; and S3, preparation of the converter dephosphorization agent: an adhesive is added to the dephosphorization agent precursor, the dephosphorization agent precursor is subjected to mixed forming, drying is carried out till the moisture content is lower than 3%, and the converter dephosphorization agent is formed. Through recovering the iron-containing middle-low grade red mud, the converter dephosphorization agent is prepared according to the method, and the preparation cost of the converter dephosphorization agent is reduced substantially based on computation and a test. In addition, the problems of land occupation and pollution of the iron-containing middle-low grade red mud are solved. After the prepared converter dephosphorization agent is put into use, the dephosphorization efficiency of the converter dephosphorization agent reaches around 90%, and the dephosphorization effect is significant.

Description

technical field [0001] The invention relates to the technical field of metallurgical charge, in particular to a method for producing a dephosphorization agent for a converter by using the middle and low grade Bayer process red mud alumina tailings (red mud). Background technique [0002] Dephosphorization agent refers to the general term for various additives used for pre-dephosphorization in molten iron pretreatment. In the existing converter steelmaking slagging, the dephosphorization agent used is usually an oxidative dephosphorization agent, which is formed by a combination of easily reduced oxidants as an oxygen source, basic oxides as a base, and fluxes. Common products are soda-based dephosphorization agents, lime-based dephosphorization agents, etc. The basic oxide used as the base in the dephosphorylation agent is to combine with the acidic oxide P 2 o 5 Generate phosphate, thereby reducing P in slag 2 o 5 activity, that is, to increase the P oxidation of phosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/064
CPCC21C5/28C21C7/0645Y02P10/20
Inventor 张启宇周娴李文明
Owner 武汉振海科技有限公司