Method for using red mud as ladle or tundish covering agent

A technology of tundish and covering agent, which is applied in the field of refractory materials, can solve the problems of not being able to cope with the output of red mud, achieve the effects of low cost, solve the problem of sewage discharge, and save resources

Active Publication Date: 2012-05-30
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

However, all the above studies have not fully utilized the active ingredients in red mud, and the amount of red mud consumed is far from being able to cope with the increasing output of red mud. There is an urgent need to research and develop new solutions
[0005] There is no literature yet to disclose how to use red mud, the waste generated in the process of extracting alumina from bauxite ore, as ladle or tundish covering agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The main components of red mud in Henan Zhongzhou Aluminum Plant are:

[0019] name

[0020] We perform magnetic separation on the above red mud to remove Fe 2 o 3 The following ingredients are:

[0021] name

[0022] SiO 2 Pre-melt with CaO at a ratio of 1:1, heat up to 1350°C-1550°C, and after 8-12 hours, the main lithofacies are CaO·SiO 2 of premelt. After crushing the premelt, add 0-8% fixed carbon according to the different steel types and co-grind until the material size is ≤1MM, and then mix the co-ground material with the red mud after iron removal in a ratio of 1:1 to prepare the medium Steel (medium) cladding covering agent required for low carbon steel.

[0023] Its weight ratio is:

[0024] Steel (middle) cladding agent

[0025] Its composition (mass percentage) of ladle covering agent is as follows:

[0026]

[0027] The thermal insulation covering agent was tested in a 20t continuous casting tundish of four-ma...

Embodiment 2

[0029] The main components (mass percentage) of the red mud of Shandong Zibo Aluminum Plant are:

[0030] name

[0031] We perform magnetic separation on the above red mud to remove Fe 2 o 3 and TiO 2 The composition (mass percentage) after is:

[0032] name

[0033] SiO 2 Pre-melt with CaO at a ratio of 1:1, heat up to 1350°C-1550°C, and after 8-12 hours, the main lithofacies are CaO·SiO 2 of premelt. The basic steel (middle) coating agent can be prepared by crushing the premelt and evenly mixing the red mud after iron removal in a ratio of 1:4.

[0034] Steel (middle) cladding agent

[0035] Its weight ratio is:

[0036] Its composition (mass percentage) of ladle covering agent is as follows:

[0037] name

[0038] The product has undergone industrial tests on the tundish of the steelmaking plant. The test results show that the covering agent has good spreadability, less dust and steel slag splash when added, no ladle capping ph...

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PUM

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Abstract

The invention discloses a method for using red mud as a ladle covering agent, which obtains a ladle or a tundish coating agent by carrying out magnetic separation to the red mud to remove the Fe2O3 and TiO2 in the red mud. The invention proposes a completely new concept for using the red mud, which namely removes ineffective components at first, and then fully uses all the rest effective components; the effective operating factor can achieve more than 85 percent. The method for using red mud as the ladle covering agent solves the application of the waste-red mud generated during the process of an alumina production enterprise to extract the alumina by bauxite mines, uses the waste as the ladle covering agent, not only has low cost, but also solves the pollution discharge problem of an alumina factory; more important, the method for using red mud as the ladle covering agent protects the environment and saves resources.

Description

technical field [0001] The invention belongs to refractory materials, and in particular relates to a covering agent for a ladle or a tundish in the steelmaking process. Background technique [0002] At present, the covering agents for ladles and tundishes are prepared by pre-melting ore or raw meal and clinker. As disclosed in the patent 02111900, the tundish covering agent for pure steel and its manufacturing method is to utilize pre-melted clinker and raw materials to mix and form. The consumption of raw material and clinker is large and the cost is high. [0003] Red mud is the waste produced during the extraction of alumina from bauxite ore. According to statistics, the production of 1 ton of aluminum requires about 2 tons of alumina, and the production of 1 ton of alumina requires 1 to 1.8 tons of red mud. In 2006, the national alumina output was about 10 million tons, and the annual discharge of red mud should be more than 15 million tons. Adding the cumulative accu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B18/14
CPCY02W30/91
Inventor 张启宇
Owner 武汉振海科技有限公司
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