Slag modification reducer and preparation method thereof, and method for Fe recovery with slag waste heat

A waste heat recovery and reducing agent technology, which is applied in the field of slag waste heat recovery iron and slag modified reducing agent, can solve the problems of large land occupation, loss of metal elements, waste of resources, etc., to reduce processing energy consumption and promote rapid response , Improve the effect of iron recovery rate

Active Publication Date: 2020-10-13
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These waste residues not only occupy a large amount of land, but also cause environmental problems such as dust, heavy metal seepage, groundwater pollution, and land depletion, which pose serious harm to human survival and social development.
In my country, due to insufficient attention to the resource utilization of copper-nickel slag and the immaturity of related technology, the efficient and comprehensive utilization of copper-nickel slag has not yet been applied on a large scale. If it is not effectively utilized, the valuable metal elements in the slag will be lost. Moreover, the temperature of the copper-nickel slag is high after being discharged from the furnace, and the waste heat is abundant, but none of them have been efficiently utilized, resulting in a serious waste of resources.
[0004] In the prior art, there are many problems in the extraction of iron from copper slag and nickel slag and the waste heat recovery of slag. The iron recovery rate is low, the process economy is not good, and the waste heat cannot be effectively utilized. Therefore, it is urgent to solve the waste heat utilization of copper nickel slag. and the recovery of iron from copper-nickel slag

Method used

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  • Slag modification reducer and preparation method thereof, and method for Fe recovery with slag waste heat
  • Slag modification reducer and preparation method thereof, and method for Fe recovery with slag waste heat

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preparation example Construction

[0033] The preparation method of the slag modified reducing agent according to the embodiment of the second aspect of the present invention includes the following steps: a. Combining 5-24 parts by weight of reducing agent, 6-12 parts by weight of binder, and 0-3 parts by weight The activators are separately ground into powder, then uniformly mixed, and granulated once to obtain granules with a particle size of 5-10mm. The activator is selected from at least one of industrial soda ash, sodium chloride, potassium carbonate or fluorite B. Mix 100 parts by weight of flux, 2-6 parts by weight of binder and 0-10 parts by weight of flux, and grind them into powder; c. Add the granules obtained in step a to the granulator As the inner core of the slag modified reducing agent, the powder obtained in the step b is coated on the inner core and subjected to secondary granulation to obtain spherical particles with a core-shell structure with a particle diameter of 15-25 mm. In the method of...

Embodiment 1

[0041] 1. Preparation of slag modified reducing agent

[0042] After 100 parts by weight of quicklime, 6 parts by weight of anthracite coal powder, 10 parts by weight of cement and 3 parts by weight of fluorite are uniformly mixed, they are ball milled to a particle size of less than 0.1 mm to obtain modified reducing agent powder. Then, pelletizing is carried out in the disc pelletizer, and a small amount of water can be added to promote the pelletizing process. After the pellet size reaches 15-25mm, it will be discharged to the conveyor belt. The modified reducing agent pellets on the conveyor belt are transported to the curing silo, and water vapor is introduced into the warehouse to promote the rapid increase of the mechanical strength of the modified reducing agent pellets, and the slag modified reducing agent used in production is cured by curing.

[0043] 2. Method for recovering iron from slag waste heat

[0044] While the molten copper slag discharged from the copper smelt...

Embodiment 2

[0048] 100 parts by weight of limestone, 21 parts by weight of coke powder, 16 parts by weight of clay powder, and 8 parts by weight of fluorite are mixed uniformly, and then ball milled to a particle size of less than 0.1 mm to obtain modified reducing agent powder. Then, the modified reducing agent powder is mixed with a small amount of water to form a semi-wet material, and then pelletized in a ball press with a particle size of 25mm. The manufactured pellets are discharged on the conveyor belt and then transported to the curing bin. Air is introduced into the bin to promote the rapid increase of the mechanical strength of the modified reducing agent pellets, and the slag modified reducing agent used in production is cured by curing.

[0049] 2. Method for recovering iron from slag waste heat

[0050] When the molten nickel slag discharged from the nickel smelting furnace at a temperature of 1350~1420℃ is poured into the hot stuffy slag pit, the molten slag modifying reducing ag...

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Abstract

The invention discloses a slag modification reducer. The slag modification reducer is shaped like spherical particles with a particle diameter of 10-30 mm and comprises 100 parts by weight of a fusionagent, 5-24 parts by weight of a reduction agent, 8-18 parts by weight of a binder and 0-10 parts by weight of a fluxing agent. The invention also discloses a method for Fe recovery with slag waste heat. The method comprises the following steps: (a) during a course when slag is discharged from a smelting furnace and poured into a heat-preservation container, the slag modification reducer is addedinto a slag flow, and a modified reduction reaction takes place; and (b) after the slag completes the reaction with the modification reducer, solid slag in the heat-preservation container is crushed,and metal Fe particles and/or Fe ore concentrate powder are obtained through magnetic separation. The method aims at the fact that the slag contains a lot of waste heat and residual Fe resources, directly conducts high-temperature waste heat modification of the slag, adjusts chemical components and a smelting temperature of the slag, reduces reduction potential energy of Fe oxides and then uses amiddle-low temperature roasting temperature and a grinding-separation technology to realize efficiency recovery of Fe in the slag.

Description

Technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and specifically relates to a slag modified reducing agent, and also relates to a preparation method of the slag modified reducing agent. In particular, the invention also relates to a method for recovering iron from slag waste heat . Background technique [0002] Copper slag and nickel slag (hereinafter referred to as copper-nickel slag) are solid waste slag produced in the process of pyrometallurgical copper and nickel smelting, and belong to non-ferrous metal smelting slag. Due to the similar characteristics of most copper and nickel smelting technologies and smelting slag types, the chemical composition and slag phase composition of solid copper slag and nickel slag are relatively similar, such as high Fe and Si content, low Ca content, and solid slag mineral phase Both belong to iron olivine and other characteristics, so copper slag and nickel slag can be collectively referred...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B5/10C21B13/00C21B3/02
CPCC22B1/005C22B5/10C21B13/0066C21B13/008C21B3/02Y02W30/91
Inventor 代文彬祁永峰陈学刚裴忠冶王书晓郭亚光王云
Owner CHINA ENFI ENGINEERING CORPORATION
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