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Method for preparing calcium-ferrum double-oxygen carrier with converter steelmaking slag as raw materials

A converter steel slag and oxygen carrier technology, which is applied in the removal of solid waste and other directions, can solve the problems of complex steel slag composition, waste of secondary resources, difficult batching, etc., and achieve the effect of good reduction reaction rate, good reaction performance, and reduced preparation cost.

Active Publication Date: 2016-02-17
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the collected metallurgical dust is not used properly, it will not only waste precious secondary resources, but also cause serious environmental pollution.
At present, the most common way to utilize steel slag is to return it to iron and steel production to recover the Fe in it. However, due to the complex composition of various steel slags, returning a large amount of steel slag to iron and steel production not only brings about difficulty in batching, but also leads to a vicious cycle of enrichment of harmful elements.
However, although the use of steel slag for paving has achieved a large amount of dust and mud utilization, it is an extensive utilization, and the valuable components and precious trace element resources in this kind of dust and mud have not been fully utilized, so that it cannot be reflected. its high added value

Method used

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  • Method for preparing calcium-ferrum double-oxygen carrier with converter steelmaking slag as raw materials
  • Method for preparing calcium-ferrum double-oxygen carrier with converter steelmaking slag as raw materials

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Take 100g of converter steel slag, add hydrochloric acid for acidolysis, filter to remove unmelted slag, add sulfuric acid, adjust the pH to 1, heat the sulfuric acid solution to 80°C, add evaporated water during the acidolysis process, and keep the acidolysis solution The surface remained unchanged, and the reaction ended after 2 hours. Then add deionized water until the total volume of the solution reaches about 500ml, add 6ml of hydrogen peroxide to the filtrate respectively, when the temperature of the filtrate rises to 80°C, add 6ml of ammonia water dropwise, adjust the pH=4 to prepare a precipitation product, and wait for the pH to stabilize Then, continue to stir for 30min. Suction filter and wash the prepared product 3 to 4 times, then put the washed product in a drying oven and dry it at 100°C for 6 hours to remove free water, and then put the product into a muffle furnace for calcination to 850°C. Keep warm for 1h to get CaSO 4 -Fe 2 o 3 Oxygen carrier sam...

Embodiment 2

[0024] Take 100g of converter steel slag, add hydrochloric acid for acidolysis, filter to remove unmelted slag, add sulfuric acid, adjust the pH to 1.5, heat the sulfuric acid solution to 90°C, add evaporated water during the acidolysis process, and keep the acidolysis solution The surface remained unchanged, and the reaction ended after 2 hours. Then add deionized water until the total volume of the solution reaches about 500ml, add 6ml of hydrogen peroxide and 6ml of ammonia water to the filtrate respectively, when the temperature of the filtrate rises to 80°C, add ammonia water dropwise, adjust pH=3.5 to prepare a kind of precipitation product, wait After the pH stabilized, the stirring was continued for 30 min. Suction filter and wash the prepared product 3 to 4 times, then put the washed product in a drying oven and dry it at 100°C for 6 hours to remove free water, after that, put the product into a muffle furnace for calcination to 800°C, Keep warm for 1h to get CaSO 4...

Embodiment 3

[0026] Take 100g of converter steel slag, add hydrochloric acid for acidolysis, filter to remove unmelted slag, add sulfuric acid, adjust the pH to 2, heat the sulfuric acid solution to 100°C, add evaporated water during the acidolysis process, and keep the acidolysis solution The surface remained unchanged, and the reaction ended after 3 hours. Then add deionized water until the total volume of the solution reaches about 500ml, add 6ml of hydrogen peroxide and 6ml of ammonia water to the filtrate respectively, when the temperature of the filtrate rises to 70°C, add ammonia water dropwise, adjust pH=4 to prepare a kind of precipitation product, wait After the pH stabilized, the stirring was continued for 30 min. Suction filter and wash the prepared product 3 to 4 times, then put the washed product in a drying oven and dry it at 100°C for 6 hours to remove free water, and then put the product into a muffle furnace for calcination to 850°C. Insulated for 1.5h to obtain CaSO 4 ...

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Abstract

The invention discloses a method for preparing a calcium-ferrum double-oxygen carrier with converter steelmaking slag as raw materials, and belongs to the technical field of solid waste utilization. According to the method, a solution containing Fe-Ca particles is obtained in the steelmaking slag through an acidolysis and PH adjustment sol-gel method, the solution is oxidized to obtain a composite particle solution and sediment, PH adjustment is carried out on a Fe-Ca source accordingly, and sediment of two elements is produced; and finally, roasting is carried out under the oxygen or air atmosphere, and the calcium-ferrum double-oxygen carrier (CaSO4-Fe2O3) is generated. Compared with a traditional method, the prepared calcium-ferrum double-oxygen carrier has good oxygen carrying capability and circulation performance, and the adopted Fe element and the adopted Ca element are both from the steelmaking slag. Accordingly, the limit that in the prior art, pure dependence on a chemical reagent and a primary energy source exists is overcome, the preparing cost is reduced, and meanwhile a new path is provided for high added-value utilization of the steelmaking slag resource.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization, and in particular relates to a calcium-iron-dioxygen carrier (CaSO 4 -Fe 2 o 3 )Methods. Background technique [0002] Oxygen carriers represented by metal oxides (Fe, Ni, Cu, Co, Mn, etc.) are research hotspots, but there are problems such as high price and secondary pollution by heavy metals. Iron ore oxygen carriers have attracted widespread attention due to their cheap price, but iron-based oxides have low oxygen loading rates. CaSO 4 non-metallic oxygen carrier, is through CaSO 4 ·CaS is cyclically and alternately reacted to realize the combustion of fuel, which has the advantages of low price and high oxygen loading rate. CaSO 4 Oxygen carrier and Fe 2 o 3 Oxygen carriers, each with strong characteristics: CaSO 4 It has a high oxygen-carrying capacity, but there are gas sulfide release problems and oxygen carrier deactivation problems caused by sulfur release durin...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 高志芳郑明东雷鹰张代林张晓勇
Owner ANHUI UNIVERSITY OF TECHNOLOGY