Method for preparing ceramic material utilizing magnetic separation tail sludge from steel slag wet process

A technology for ceramic materials and tailings, which is applied in the fields of comprehensive utilization of resources and environmental protection, can solve the problem of the limitation of the utilization of tailings in the wet magnetic separation of steel slag, and achieve the effect of reducing the burden of iron removal.

Active Publication Date: 2014-03-26
迁安金隅首钢环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low magnesium content in the tailings of steel slag wet magnetic separation, diopside needs to be added with magnesium-containing minerals, such as talc, which limits the utilization of steel slag wet magnetic separation tailings in ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, filter the discharged water-containing tailings to a water content of 65%, and test a 250-mesh sieve to find 1.0%. Add clay, pyrophyllite, quartz, feldspar, etc. to the tailings slurry with a water content of 65%, and distribute the components The ratio is: mud (converted to dry basis) 34%, clay 20%, feldspar 16%, pyrophyllite 25%, quartz 5%, and add 0.05% sodium hydroxymethyl cellulose, 0.3% sodium tripolyphosphate , the prepared mixed slurry is mixed by ball milling, sieved, dried and powdered for later use. After the pressed body is dried, it enters the heating equipment for sintering, and the sintering temperature is 1140°C. The compressive strength of the fired product is 382MPa, the bending strength is 79.50MPa, and the microhardness is 6.52GPa.

Embodiment 2

[0021] First, filter the discharged water-containing tailings to a water content of 75%, and test a 250-mesh sieve to find 1.7%. Add clay, pyrophyllite, quartz, and feldspar to the slurry with a water content of 75%, and the distribution ratio of each component is: : Mud (converted into dry basis) 34%, clay 15%, feldspar 16%, pyrophyllite 30%, quartz 5%, and add 0.1% sodium hydroxymethyl cellulose, 0.9% sodium tripolyphosphate, the The prepared mixed slurry is ball milled and mixed, dried and powdered for later use. After the pressed body is dried, it enters the heating equipment for sintering, and the sintering temperature is 1140°C. The compressive strength of the fired product is 155MPa, the bending strength is 70.28MPa, and the microhardness is 6.02GPa.

Embodiment 3

[0023] The preparation steps are the same as those described in Example 1. Add clay, pyrophyllite, quartz, feldspar, etc. directly to the slurry with a moisture content of 50% and a sieve residue of 9.2% on a 250-mesh sieve. Clay 16%, feldspar 9%, pyrophyllite 12%, quartz 3%, add 0.2% sodium hydroxymethyl cellulose, 0.9% sodium tripolyphosphate, mix the prepared mixed slurry by ball milling, and sieve , dried and powdered for later use. After the compacted green body is dried, it enters the heating equipment for sintering, and the sintering temperature is 1155°C. The compressive strength of the fired product is 283MPa, the bending strength is 68.13MPa, and the microhardness is 6.46GPa.

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Abstract

The invention discloses a method for preparing a ceramic material utilizing magnetic separation tail sludge from a steel slag wet process, and belongs to the fields of source comprehensive utilization and environmental protection. The mass percent of a tail sludge drier (converted into dry basis) is 5%-68% of the mixed raw material drier (converted into dry basis); and the mass percent of various component driers in the corresponding ingredients is as follows: 15-35% of clay, 3-25% of feldspar, 5-30% of pyrauxite, and 0.1-8% of quartz and on the like. The preparation method comprises the following steps: the wet tail sludge and the corresponding ingredients are added in a bal mill to be milled uniformly; then the mixed materials are dried, pelletized and pressed to mold, or the mixed materials are extruded and molded; and further, the molded materials are placed in a kiln and fired at 1100-1250 DEG C to obtain the ceramic product. By virtue of a deep iron selection process of steel works, the tail sludge slurry with granularity, iron content and water content meeting the requirements of ceramic raw material is obtained, so that the high power consumption and low efficiency of metallurgic slag utilized for the traditional ceramic preparation are reduced.

Description

Technical field: [0001] The invention relates to a method for directly using steel slag wet magnetic separation tailings to prepare ceramic materials, and belongs to the fields of resource comprehensive utilization and environmental protection. Background technique: [0002] my country is a big country in steel production, with an annual output of about 600 million tons of crude steel. As a by-product of the steelmaking process, the annual production of steel slag reaches tens of millions of tons. At present, there is no effective way to rationally utilize steel slag resources on a large scale, and the utilization rate of steel slag in my country is still lower than 30%. [0003] Recycling the iron raw materials in steel slag is currently the main method for steel plants to process steel slag, which is usually achieved by dry crushing and magnetic separation. However, due to the complex form of iron in steel slag, it is necessary to grind the steel slag to a smaller particl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/138
CPCY02P40/60
Inventor 李宇艾仙斌刘晓明张玲玲顾晓朦苍大强唐奇
Owner 迁安金隅首钢环保科技有限公司
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