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Fast-setting water-hardening sludge cold hardened pellet and preparation method thereof

A technology for cold-solidifying pellets and sludge, applied in chemical instruments and methods, clay preparation devices, cement mixing devices, etc. Environmental protection and comprehensive utilization of resources, good economic and environmental value, and the effect of ensuring particle integrity

Inactive Publication Date: 2009-10-07
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of pellets is to mix iron ore powder and bentonite, add water to roll in the pelletizing plate, the disadvantage of this traditional method is that the amount of bentonite is large, the amount of water added is large, and the raw pellets are roasted and iron-smelted. Steelmaking, in the process of steelmaking, a large amount of sludge is also produced, causing environmental pollution
[0004] At the same time, the treatment of dust removal in iron and steel plants has always been an environmental issue that has attracted much attention. If the method of discharging from the yard is used for disposal, it will pollute the environment and occupy land resources; at the same time, converter sludge rich in metallic iron, Random discharge of dust will also cause waste of secondary resources
[0005] In addition, sulfuric acid slag, as an iron-containing raw material, has been used in the sintering ironmaking process. The traditional method is to directly mix ore and sinter on a belt sintering machine. big problem

Method used

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  • Fast-setting water-hardening sludge cold hardened pellet and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] As shown in the figure, according to the percentage by weight, the feed materials are prepared in the following proportions: converter sludge 35%, dedusting ash 35%, sulfuric acid slag 23%; plus 7% sulphoaluminate cement as a binder.

[0049] Put the above added material into the mixer and turn it for 10 minutes to mix evenly, then add it to the disc pelletizer, start the pelletizer and rotate it at 5 rpm for 5 minutes, then increase the pelletizer speed to 10 rpm, and Spraying the phosphoric acid solution containing 0.05% phosphoric acid to form small balls with a diameter of 3-10 mm, and leaving the balls under natural conditions for more than 24 hours to obtain cold-set pellets.

Embodiment 2

[0051] According to the percentage by weight, the feed materials are prepared in the following proportions: 40% of converter sludge, 30% of dedusting ash, 22% of sulfuric acid slag; plus 8% of sulphoaluminate cement and phosphoric acid mixture as binder.

[0052]Put the above added material into the mixer and turn it for 10 minutes to mix evenly, then add it to the disc pelletizer, start the pelletizer and rotate it at 5 rpm for 5 minutes, then increase the pelletizer speed to 10 rpm, and Spray the phosphoric acid solution containing 0.1% phosphoric acid to form pellets with a diameter of 3-10 mm, and leave the pellets under natural conditions for more than 24 hours to obtain cold-set pellets.

Embodiment 3

[0054] According to the percentage by weight, the feed materials are prepared in the following proportions: 38% of converter sludge, 35% of dedusting ash, 20% of sulfuric acid slag; plus 7% of sulphoaluminate cement as a binder.

[0055] Put the above added material into the mixer and turn it for 10 minutes to mix evenly, then add it to the disc pelletizer, start the pelletizer and rotate it at 5 rpm for 5 minutes, then increase the pelletizer speed to 10 rpm, and Spraying the phosphoric acid solution containing 0.05% phosphoric acid to form small balls with a diameter of 3-10 mm, and leaving the balls under natural conditions for more than 24 hours to obtain cold-set pellets.

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Abstract

The invention discloses a fast-setting water-hardening sludge cold hardened pellet which is formed mainly by mixing converter sludge, settled dust, sulfuric acid residue and binder, and then adding 0.05-0.1 percent (in concentration) of phosphoric acid, then finally conducting disc pellet fabrication and cold hardening; the pellet is quite suitable to be served as the sintering materials of a belt-type sintering machine; in addition, the invention also provides a preparation method for the fast-setting water-hardening sludge cold hardened pellet; and the method ensures the integrity of particles when the cold hardened pellet enters the mixing materials, maintains the permeability of a sintered material layer, and can obtain stable economic indicators of sintering production technology.

Description

technical field [0001] The invention relates to the production technology of pelletizing in the metallurgical industry, in particular to a cold solidified pellet of rapidly setting water hardening sludge and a preparation method thereof. Background technique [0002] In the 1920s, Sweden used portland cement to produce water-hardening pellets. After a curing period, water-hardening pellets with a certain strength were obtained. Later, after the improvement of the former Soviet Union and the Japanese, different processes were formed, but the basic principle is the same, that is, calcium silicate hydrate and calcium ferrite hydrate gel are formed, and strength is obtained after a certain maintenance period. The more obvious problem in this method is that the freezing time is too long (more than 96 hours), and a large storage area is required to meet the needs of the maintenance period. [0003] At present, the production of pellets is to mix iron ore powder and bentonite, add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28C7/04B28C5/08B28B1/02B28B11/24
Inventor 张明远万新袁晓丽杜长坤周书才朱虹
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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