Waste slag comprehensive recovery and utilization method for non-ferrous metals industry

A technology for industrial waste residue and non-ferrous metals, applied in the improvement of process efficiency, cement production and other directions, can solve the problems of good economic benefits, short process, low comprehensive utilization of resources, etc., and achieve the effect of simple process and short process

Inactive Publication Date: 2008-11-12
ZHENGZHOU YONGTONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method aims at the defect of low comprehensive utilization of resources existing in the treatment of non-ferrous metal industrial waste slag, can comprehensively utilize resources well, has a simple and short process, good economic benefits and is conducive to environmental protection

Method used

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  • Waste slag comprehensive recovery and utilization method for non-ferrous metals industry

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Effect test

Embodiment 1

[0014] Transport the molten nickel smelting waste slag directly into the submerged electric furnace, turn on the electricity and raise the temperature to 1450°C, then use compressed air to spray the mixture of coal powder and coke through the spray gun, and add CaO into the submerged electric furnace at the same time; pulverized coal The mixture with coke can reduce the iron in the slag to produce a semi-steel alloy containing more than 80% iron, and then transport the semi-steel alloy to the converter or electric furnace to smelt it into qualified molten steel; The hot slag can be used as cement clinker to be sent to the cement factory to produce high-quality cement; the weight ratio of the raw materials is, nickel pyrometallurgy waste slag:coke:coal powder:CaO=55:1:4:25.

Embodiment 2

[0016] The blast furnace slag with an iron content of more than 20% produced by pyrometallurgy in a molten state is directly transported into the submerged electric furnace, energized and heated to 1700°C, and then compressed nitrogen is used to spray the mixture of coal powder and coke through the spray gun. At the same time, CaO is added to the submerged electric furnace; the mixture of coal powder and coke reduces the iron in the slag, and the semi-steel alloy with iron content greater than 80% is obtained, and then the semi-steel alloy is transported to the converter or electric furnace, and smelted into qualified molten steel; also obtain submerged arc slag simultaneously, this submerged arc slag can send cement plant to produce high-quality cement as cement clinker; The weight ratio of described raw material is, the blast furnace slag that pyrometallurgy produces iron content more than 20%: Coke: pulverized coal: CaO=70:6:9:35.

Embodiment 3

[0018] The flash slag with an iron content of more than 20% produced by pyrometallurgy in a molten state is directly transported into the submerged electric furnace, and the temperature is raised to 1500°C with electricity, and then the mixture of pulverized coal and coke is injected through the spray gun with compressed nitrogen At the same time, CaO is added to the submerged electric furnace; the mixture of coal powder and coke reduces the iron in the slag, and the semi-steel alloy with iron content greater than 80% is obtained, and then the semi-steel alloy is transported to the converter or electric furnace, and smelted into Qualified molten steel; also obtain submerged arc slag at the same time, this submerged arc slag can be sent as cement clinker to cement factory to produce high-quality cement; Slag:coke:coal powder:CaO=60:3:6:28.

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Abstract

The invention relates to a method for the comprehensive reutilization of nonferrous metal industrial residue. The method is characterized by comprising the following steps that: an ore smelting electric furnace is adopted to deoxidize, smelt and directly process the molten nonferrous metal industrial residue to produce a semisteel alloy containing iron of over 80 percent, then the semisteel alloy is sent to a converter or the electric furnace and smelted to qualified molten steel; at the same time, in the deoxidization and smelting process, slag is made by adding CaO in order that the slag of the ore smelting electric furnace is used as a cement clinker to directly produce cement. The method can comprehensively utilize resource, has simple process, short flow and good economical benefit and makes for environmental protection.

Description

technical field [0001] The invention relates to a method for recycling industrial waste residues, in particular to a method for comprehensive recycling of nonferrous metal industrial waste residues. Background technique [0002] In the traditional nickel sulfide ore pyrometallurgical nickel smelting process, a large amount of smelting slag should be produced. The content of FeO in the slag is generally between 25% and 42%, and most of Fe is 2FeO·SiO 2 Exists in the form of Fe 3 o 4 It exists in the form of 0.18-0.4% Ni, 0.2-0.6% Cu, and 0.1-0.3% Co in the slag. These non-ferrous metals are important alloying elements and have valuable utilization value and strategic significance. This kind of slag also contains high temperature heat energy above 1300°C. Due to the difficulty of comprehensive treatment, most non-ferrous metal production enterprises do not do refining and extraction treatment, and mainly adopt direct water quenching and stacking on the surface, which not on...

Claims

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Application Information

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IPC IPC(8): C21B11/10C04B7/17C04B5/00
CPCY02P10/20Y02P40/10
Inventor 董书通王成彦赵平
Owner ZHENGZHOU YONGTONG SPECIAL STEEL
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