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Stainless steel metal-bearing solid waste pelletizing process

A stainless steel and pelletizing technology is applied in the field of stainless steel metal-containing solid waste pelletizing process to achieve the effects of reducing the hidden danger of environmental pollution, high compressive strength, good drum strength and wear resistance index

Inactive Publication Date: 2020-11-20
BERIS ENG & RES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since metal-containing solid wastes with various compositions and complex components are added to the ore powder materials, there is no pelletizing method that can be used for reference in the face of such complex raw materials. It is necessary to explore and find a suitable pelletizing process system to meet the Requirements for compressive strength, drum strength and wear resistance index of solid metal waste pellets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] With South African chromite: stainless steel metal-containing solid waste (excluding continuous casting grinding dust) = 68:32 mass ratio weighing, the mixture formed after grinding, and bentonite and moisture with a mass of 88.7:1.4:9.9 Proportionally mixed and pelletized for 12 minutes, the resulting green pellets had a drop strength of 30.0 times / 0.5m, a compressive strength of 22.16N / piece, and a burst temperature of 350°C. Then preheat at 850°C for 12 minutes, at this time the compressive strength is 608N / piece. Then preheat at 1300°C for 16 minutes. At this time, the compressive strength is 1522N / piece, the drum strength is 92.1%, and the wear resistance index is 7.1%.

Embodiment 2

[0049] The mass ratio of Turkish chromite: stainless steel metal-containing solid waste (excluding continuous casting grinding shavings) = 40:60 is weighed, and the mixture formed after grinding is mixed with bentonite and water at a mass ratio of 89.25:2.25:8.5 Proportionally mixed and pelletized for 14 minutes, the resulting green pellets had a drop strength of 21.6 times / 0.5m, a compressive strength of 28.97N / piece, and a burst temperature of 245°C. Then preheat at 1000°C for 12 minutes, at this time the compressive strength is 653N / piece. Then preheat at 1350°C for 14 minutes. At this time, the compressive strength is 1460N / piece, the drum strength is 91.3%, and the wear resistance index is 8.1%.

Embodiment 3

[0051] South African chromite: Turkey chromite: stainless steel metal-containing solid waste (excluding continuous casting grinding dust) = 25:25:50 mass ratio weighing, the mixture formed after grinding, and bentonite and moisture The mass ratio of 86.75:1.25:12 was mixed and pelletized for 14 minutes. The drop strength of the obtained green pellets was 18.1 times / 0.5m, the compressive strength was 30.43N / piece, and the burst temperature was 263°C. Then preheat at 1050°C for 14 minutes, at this time the compressive strength is 855N / piece. Then preheat at 1325°C for 18 minutes. At this time, the compressive strength is 1630N / piece, the drum strength is 93.2%, and the wear resistance index is 6.5%.

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Abstract

The invention belongs to the field of metallurgical raw material treatment and resource recycling, and relates to a stainless steel metal-bearing solid waste pelletizing process. The stainless steel metal-bearing solid waste pelletizing process comprises the steps that (1) chromite and stainless steel metal-bearing solid waste are mixed in proportion, and a mixture is obtained after ore grinding treatment; (2) bentonite and water are added into the mixture according to the proportion with the mass ratio of the mixture to the bentonite to the water being (86-90):(1-2.5):(7-16), and pelletizingis carried out after even mixing to obtain fresh pellets; and (3) the fresh pellets are preheated for 6-16 min at the temperature ranging from 850 DEG C to 1,100 DEG C to obtain preheated pellets, then the preheated pellets are roasted for 12-18 min at the temperature ranging from 1,200 DEG C to 1,350 DEG C, and high-quality pellets are obtained. According to the stainless steel metal-bearing solid waste pelletizing process, the proportion of the mixture, the bentonite and the water is reasonably controlled, meanwhile, the temperature and time of the preheating process and the roasting processare controlled within the specific range, the compressive strength of the finally-obtained pellets is high, the good drum strength and wear resistance index are achieved, and the subsequent transporting and in-furnace smelting requirements can be met.

Description

technical field [0001] The invention belongs to the field of metallurgical raw material processing and resource recycling, and in particular relates to a stainless steel metal-containing solid waste pelletizing process. Background technique [0002] With the rapid development of the economy, the output of stainless steel in my country is increasing year by year. In addition to producing a large amount of pickling sludge, it also accumulates a considerable amount of dust, deacidified iron oxide powder, hot-rolled oxide scale, and continuous casting grinding debris. These solid wastes contain a lot of valuable metals such as iron, chromium, nickel, etc. At present, the treatment methods for stainless steel metal solid waste at home and abroad are mainly divided into three levels: harmless treatment, solidification and stabilization treatment, and resource utilization. Harmless treatment is mainly to reduce the high-valent chromium (especially Cr 6+ ) content. The main method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/248
CPCC22B1/2406C22B1/248C22B1/243
Inventor 吕韬李秦灿宁晓宇
Owner BERIS ENG & RES CORP
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