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Method for extracting iron from modified molten copper slag and preparing ceramic using tailings of modified molten copper slag

A technology for melting copper and upgrading, which is applied in the fields of resource utilization and environmental protection to achieve the effects of green recycling, less addition, and lower viscosity

Pending Publication Date: 2019-11-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for preparing ceramics from molten copper slag for upgrading iron and its tailings, which solves the problem of "traditional large-scale addition (10% to 30%) of oxidation-containing The calcium raw material is used as a modifier, so that the molten copper slag needs a complex process of supplementary heat, and additional high temperature is required to convert the iron phase from olivine to magnetite. Traditionally, a large amount of copper slag or magnetic separation tailings are used for cement, roads, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The chemical composition analysis results (wt%) of the copper slag of a copper smelter are as follows: In the copper slag, 27.29wt% SiO 2 , 49.51wt% Fe 2 o 3 , 3.71wt% Al 2 o 3 , 3.68wt% ZnO, 3.06wt% CaO, 2.69wt% MgO, 0.98wt% Na 2 O, 0.64 wt% K 2 O, other 8.44wt%.

[0041] 1500°C, the above molten copper slag is mixed with a modifying agent containing alkali metal oxides, and the alkali metal oxides Na 2 The sum of the percentages of O is 2%. After mixing, spray a small amount of air, then cool the modified molten copper slag to 1000°C with an average cooling rate of less than 10°C / min, and then heat-splash in the air to obtain the required modified copper slag; The obtained modified copper slag is finely ground to 200 mesh and subjected to magnetic separation, and magnetic separation separates iron fine powder and non-magnetic tailings, and the iron recovery rate in the iron fine powder is 86%; with this tailings as raw material, the prepared ceramics The lowes...

Embodiment 2

[0043] The chemical composition analysis results (wt%) of the copper slag of a copper smelter are as follows: In the copper slag, 27.29wt% SiO 2 , 49.51wt% Fe 2 o 3 , 3.71wt% Al 2 o 3 , 3.68wt% ZnO, 3.06wt% CaO, 2.69wt% MgO, 0.98wt% Na 2 O, 0.64 wt% K 2 O, other 8.44wt%.

[0044] 1500°C above-mentioned molten copper slag is mixed with 6.84% soda ash by mass percentage, wherein the alkali metal oxide Na 2 The sum of the percentages of O is 4%. After mixing, spray a small amount of air, then place the modified molten copper slag at 1300°C for more than 30 minutes, and then quench it in air to obtain the required modified copper slag; Copper slag is finely ground to 200 mesh and subjected to magnetic separation, which separates iron fine powder and non-magnetic tailings. The recovery rate of iron in iron fine powder is 89%. Using the tailings as raw material, the minimum sintering temperature of the prepared ceramics is The temperature is 1025 to 1085°C, the best bending ...

Embodiment 3

[0046] A certain synthetic copper slag is prepared by using the following chemically pure reagent raw materials, and its chemical composition (wt%) is as follows: 62wt% Fe 3 o 4 , 30.5wt% SiO 2 , 4wt% Al 2 o 3 , 3.5 wt% CaO.

[0047] 1500 ℃ above-mentioned molten copper slag is mixed with the soda ash of mass percentage content being 3.42wt%, 6.84wt%, 13.64wt%, 17.39wt%, wherein, alkali metal oxide Na 2 The mass percent content of O is 2wt%, 4wt%, 6wt%, 8wt%. After mixing, spray a small amount of air, then cool the modified molten copper slag to 1000°C with an average cooling rate of less than 10°C / min, and then heat it in the air to obtain the required modified copper slag; The obtained modified copper slag is finely ground to 200 mesh and magnetically separated to separate the fine iron powder.

[0048] Its iron recovery index is as follows:

[0049] When alkali metal oxide Na 2 When the mass percent content of O was 2wt%, the recovered iron grade was 43.9wt%, and th...

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Abstract

The invention provides a method for extracting iron from modified molten copper slag and preparing ceramic using tailings of modified molten copper slag, and belongs to the technical field of resourceutilization and environmental protection. The method comprises the steps that by taking molten copper slag as a raw material, a modifier containing alkali metal oxide is added in a molten state of the copper slag, or the atmosphere of the molten copper slag is simultaneously controlled in a blowing gas mode, so that an iron-containing phase of the molten copper slag is transformed into magnetitethrough modification, and after magnetic minerals such as the magnetite are fully crystallized and grown up, the modified molten copper slag is cooled; and he cooled copper slag is subject to crushingand magnetic separation treatment to obtain iron fine powder and the tailings; and the tailings containing the alkali metal oxide is utilized as a ceramic raw material to prepare a ceramic material.According to the method for the extracting the iron from the modified molten copper slag and preparing the ceramic using the tailings of the modified molten copper slag, high-temperature heat energy of furnace slag melts the modifier, the composition and the structure of the slag are changed by reasonably controlling the temperature, the additive and the movement behaviors of fluids, so that the valuable components in the slag are recycled, and the separated tailings are used as the raw materials for preparing the ceramic, and a ceramic product is further prepared.

Description

technical field [0001] The invention relates to the technical field of resource utilization and environmental protection, in particular to a method for preparing ceramics by modifying molten copper slag to improve iron and its tailing slag. Background technique [0002] In recent years, with the rapid development of my country's economic construction, a large amount of non-ferrous metallurgical waste slag has been produced in the process of industrial production, and the copper slag is the slag produced in the process of copper smelting. Strengthening the utilization of secondary resources is the development direction of the metallurgical industry, especially the copper slag with a total iron content of 30-50wt%, which is a solid waste generated during the copper smelting process, and the green recycling of iron resources and tailings is an existing technology difficulty. According to incomplete statistics, my country's copper smelting enterprises produce 1,000 tons of copp...

Claims

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Application Information

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IPC IPC(8): C22B1/00B03C1/015B03C1/02C04B33/138
CPCB03C1/015B03C1/02C04B33/138C22B1/005Y02P10/20Y02P40/60
Inventor 李宇孟昕阳
Owner UNIV OF SCI & TECH BEIJING
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