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A kind of additive for strengthening copper slag direct reduction to recover iron and copper and its application

An additive and copper strengthening technology, which is applied to the improvement of process efficiency, furnace, furnace type, etc., to achieve the effects of reducing production costs, alleviating the shortage of raw materials, and improving the conditions of reduction kinetics

Active Publication Date: 2020-08-04
北京中宏联工程技术有限公司
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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 an additive for strengthening the direct reduction of copper slag to recover iron and copper and its application to solve the problem of how to efficiently strengthen the phase transformation of fayalite and copper sulfide in copper smelting slag in the high temperature reduction process in the prior art , to catalyze the technical problem of its rapid reduction, and improve the recovery rate of copper and iron in the direct reduction-magnetic separation process and the quality of copper-containing iron powder products

Method used

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  • A kind of additive for strengthening copper slag direct reduction to recover iron and copper and its application

Examples

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Effect test

Embodiment 1

[0041] Copper smelting slag is mixed with additives with a mass ratio of 10% (mass ratio is 50% limestone, 45% pyrolusite, and 5% sodium humate), and the pelletizing time is 10 minutes, and the pelletizing water is 8.0%. Green balls with a particle size of 10-20 mm. The drop strength of green balls is 4.7 times / 0.5m, the compressive strength of green balls is 11.3N / piece, and the bursting temperature of green balls is 320°C. After adding 10% of additives, the green balls had good properties, and compared with Comparative Example 1, the quality of the green balls was significantly improved.

Embodiment 2

[0043]Copper smelting slag is mixed with additives with a mass ratio of 10% (mass ratio is 50% limestone, 42% pyrolusite, and 8% sodium humate), and the pelletizing time is 10 minutes, and the pelletizing water is 8.0%. Green balls with a particle size of 10-20mm. The drop strength of green balls is 5.9 times / 0.5m, the compressive strength of green balls is 12.9N / piece, and the bursting temperature of green balls is 370°C. Compared with Example 1, it is found that the drop strength and compressive strength of the green balls are slightly increased, and the bursting temperature of the green balls is significantly increased. The main reason is that the proportion of sodium humate binder in the additive increases, which leads to the enhancement of the additive's bonding performance and the increase of the green ball strength.

Embodiment 3

[0045] Copper smelting slag is mixed with additives with a mass ratio of 25% (mass ratio is 50% limestone, 42% pyrolusite, and 8% sodium humate), and the pelletizing time is 10 minutes, and the pelletizing water is 8.0%. Green balls with a particle size of 10-20mm. The drop strength of green balls is 7.9 times / 0.5m, the compressive strength of green balls is 15.9N / piece, and the bursting temperature of green balls is 480°C. Compared with Example 2, it is found that the drop strength and compressive strength of green balls are obviously increased. The main reason is that the increase in the proportion of sodium humate binder in the additive leads to the enhancement of the additive's bonding performance and the increase of the green ball strength; at the same time, due to the further increase in the proportion of the additive, the various active ingredients in it increase. Therefore, increasing the ratio of additives is an effective way to improve the performance of green pelle...

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Abstract

The invention discloses an addition agent for strengthening direct reduction and recovery of iron and copper from copper slag and application of the addition agent, and belongs to the technical fieldof metallurgy and industrial waste slag resource utilization. The addition agent is prepared from the components in percentage by mass: 50-60% of an alkaline earth metal source, 30-50% of pyrolusite and 5-10% of sodium humate. According to the addition agent for strengthening direct reduction and recovery of the iron and the copper from the copper slag and the application, component distribution is reasonable, the production technology is simple, using is convenient, and the functions that catalytic reduction of copper and iron mineral is achieved, the reduction kinetic condition is improved,and pelletizing is strengthened are achieved. According to the technology, the awkward situation that in an conventional method, separation is difficult due to tight embedment of copper and iron in copper smelting can be avoided, highworth utilization of copper smelting slag is achieved, iron powder containing copper with high quality can also be obtained through magnetic separation and replaces electrolytic copper, furnace burden with high quality is provided for smelting special steel containing copper, the production cost of the special steel containing copper is lowered, and economic benefits are improved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of metallurgy and industrial waste slag, and in particular relates to an additive for strengthening direct reduction of copper slag to recover iron and copper and its application. Background technique [0002] In previous studies, it is generally believed that when the copper content in steel exceeds a certain content, it will increase the sensitivity to hot processing, cause hot embrittlement, cause scale defects in the product, and lead to product performance degradation. With extensive and in-depth research on copper alloying at home and abroad, it is found that an appropriate amount of copper in steel can improve the corrosion resistance and antibacterial properties of steel, increase the strength and impact toughness of steel, and improve the weldability, formability and machinability of steel. Wait. Therefore, in view of its excellent properties, more and more copper is added t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/08C21B13/14C22B1/248C22B7/04C22B15/00
CPCC21B13/0066C21B13/08C21B13/14C22B1/2406C22B1/248C22B7/001C22B7/04C22B15/0054Y02P10/20
Inventor 郭正启朱德庆潘建李启厚李紫云梁钟仁李思唯杨聪聪田宏宇
Owner 北京中宏联工程技术有限公司
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