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Method for synchronously preparing iron oxide red and sodium disilicate by utilizing desiliconized sludge

A technology of sodium disilicate and red iron oxide, applied in the directions of iron oxide, iron oxide/iron hydroxide, silicate, etc., can solve the problem of difficult separation of sodium disilicate, and achieve good effect and low residual chlorine content , the effect of improving performance

Pending Publication Date: 2021-06-04
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction is to adjust the mold by adding silica gel to sodium silicate to obtain sodium disilicate. If silicon-containing sludge is used instead of silica gel, sodium disilicate is difficult to separate

Method used

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  • Method for synchronously preparing iron oxide red and sodium disilicate by utilizing desiliconized sludge
  • Method for synchronously preparing iron oxide red and sodium disilicate by utilizing desiliconized sludge

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Embodiment 1

[0036] A method of synchronously preparing iron oxide red and sodium disilicate by utilizing desiliconization sludge in this embodiment, the steps are:

[0037] 1. Take the desiliconized sludge from the iron and steel plant, extrude it into a spherical shape, put it into a muffle furnace for roasting, the roasting temperature is 600 ° C, and the holding time is 2 hours. Finally, the desiliconized sludge after calcining and dechlorination is ground, and the particle size of the grinding requires a 0.08mm square hole sieve with a residue of 5.2%.

[0038] 2. SiO in the desiliconized sludge after grinding 2 Mass content 25.48%, get 100g and put into autoclave, and add 40% sodium hydroxide solution 40.5ml wherein, mol ratio is n(Na 2 O):n(SiO 2 ) = 1:2.1, then add water to a solid-to-liquid ratio of 1:3, and conduct a hydrothermal reaction at 200°C in a high-pressure reactor for a reaction time of 60 minutes, so that the silicon dioxide in the iron oxide powder and the lye are f...

Embodiment 2

[0044] A method of synchronously preparing iron oxide red and sodium disilicate by utilizing desiliconization sludge in this embodiment, the steps are:

[0045] 1. Take the desiliconized sludge from the iron and steel plant, extrude it into a spherical shape, put it into a muffle furnace for roasting, the roasting temperature is 650°C, and the holding time is 1.5h. Finally, the desiliconized sludge after calcining and dechlorination is ground, and the particle size of the grinding requires a 0.08mm square hole sieve with a residue of 7.3%.

[0046] 2. SiO in the desiliconized sludge after grinding 2 Mass content 27.72%, get 75g and put into autoclave, and add 30% sodium hydroxide solution 45.1ml wherein, mol ratio is n(Na 2 O):n(SiO 2 ) = 1:2.05, and then add water to a solid-liquid ratio of 1:10. The high-pressure reactor is subjected to a hydrothermal reaction at 180°C for a reaction time of 100 minutes, so that the silicon dioxide in the iron oxide powder and the lye are ...

Embodiment 3

[0052] A method of synchronously preparing iron oxide red and sodium disilicate by utilizing desiliconization sludge in this embodiment, the steps are:

[0053] 1. Take the desiliconization sludge from the iron and steel plant, extrude it into a rod shape, put it into a muffle furnace for roasting, the roasting temperature is 700°C, and the holding time is 1h. Finally, the desiliconized sludge after calcining and dechlorination is ground, and the particle size of the grinding requires a 0.08mm square hole sieve with a residue of 4.9%.

[0054] 2. The desiliconized sludge after grinding, in which SiO 2 Mass content 26.13%, get 100g and put into autoclave, and add 20% sodium hydroxide solution 87.1ml wherein, mol ratio is n(Na 2 O):n(SiO 2 ) = 1:2, and then add water to a solid-liquid ratio of 1:5. The high-pressure reactor is subjected to a hydrothermal reaction at 170°C, and the reaction time is 100 minutes, so that the silicon dioxide in the iron oxide powder and the lye ar...

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Abstract

The invention discloses a method for synchronously preparing iron oxide red and sodium disilicate from desiliconized sludge, and belongs to the technical field of waste recovery and efficient utilization and environmental protection. The method comprises the following steps: firstly, carrying out high-temperature calcination dechlorination and grinding on water-containing desiliconized sludge, then adding a sodium hydroxide solution to carry out hydrothermal reaction, conducting dehydrating to obtain a sodium disilicate solution and an iron oxide red precipitate, and washing and drying an iron oxide red filter cake for multiple times to obtain iron oxide red powder; and adding an auxiliary agent into the sodium disilicate solution, and conducting evaporating, drying and calcining to obtain sodium disilicate crystals. According to the method, the sodium disilicate mother liquor is directly synthesized by adopting a one-step method to adjust the mold, the dissolution and separation of silicon in the iron oxide red and the synchronous synthesis of the sodium disilicate are realized, and meanwhile, aluminum impurities contained in the desilicication sludge dissolve out and enter the sodium disilicate mother liquor while alkali is used for dissolving out the silicon, so that the performance of the synthesized layered sodium disilicate is improved.

Description

technical field [0001] The invention relates to a method for synchronously synthesizing layered sodium disilicate by preparing iron oxide red from industrial waste, and belongs to the technical field of waste recycling, high-efficiency utilization and environmental protection. Background technique [0002] Before the hot-rolled steel strips of iron and steel enterprises are subjected to the cold-rolling process, they usually undergo a pickling process to remove iron oxide scale, oil stains and dirt on the steel surface. Because hydrochloric acid pickling has the characteristics of fast speed, easy acid regeneration and low cost, it has become the mainstream technology in steel strip pickling. The pickling waste liquid will be regenerated: after the reaction in the iron-dissolving tank, 20% ammonia water is added to adjust the pH value so that the pH value of the waste acid rises to 2.5-4, and at the same time, compressed air is introduced to oxidize ferrous iron into ferric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01B33/32
CPCC01G49/06C01B33/32C01P2002/72
Inventor 盛广宏沈溢韦雅楠石凯鹏张孜涵王诗生刘玲
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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