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Method for preparing precipitated silica with boron sludge

A technology for precipitating silicon dioxide and silicon dioxide, applied in the directions of silicon dioxide, silicon oxide, magnesium carbonate, etc., can solve the problems of unutilized silicon, consumption of large sulfuric acid, and high production cost, so as to improve the comprehensive utilization rate of resources, Effects of addressing environmental impacts

Inactive Publication Date: 2008-12-17
肖莹
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Problems solved by technology

[0005] The disadvantage of this process is that magnesium oxide actually exists in the boron mud in the form of heavy magnesium carbonate and magnesium silicate.
[0007] The shortcomings of this process: same as the phase transfer method, it consumes a lot of energy, the process is long, the process is complicated, and the investment in equipment is large
[0009] The disadvantages of this process: the boron mud treatment process needs to consume a lot of sulfuric acid, and the decomposition rate is low, and the production cost is high
The acid waste generated in the production process will cause secondary pollution to the environment
unavailable for silicon

Method used

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  • Method for preparing precipitated silica with boron sludge
  • Method for preparing precipitated silica with boron sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: preparation of food grade magnesium carbonate by acid leaching boron mud

[0026] raw material:

[0027] A. Boron mud: the main component is MgO 33wt%; SiO 2 22wt%;

[0028] B. Sulfuric acid: industrial grade, concentration 93%;

[0029] Activator: hydrofluoric acid.

[0030] Acid leaching: Mix the undried wet-based boron mud with water at a solid-to-liquid ratio of 1:1 for beating, first add 2% activator, stir well, then add the calculated amount of sulfuric acid, and react at about 90°C for 30 minutes. When the slurry thickens, add water to dilute it, control the solid-liquid ratio of 3:1, and react at about 90°C for 90 minutes. When the pH value is stable at about 7.5, add oxidant hydrogen peroxide or sodium hypochlorite and react for 10 minutes, then add Add additives (light-burned magnesia or bitter earth powder) to adjust the pH value, and then heat and react at 90°C for 30 minutes. At this time, impurities such as iron and aluminum are almost c...

Embodiment 2

[0060] Embodiment 2: Secondary boron mud prepares precipitated silica

[0061] (1) Mix the secondary boron mud and tap water at a ratio of 0.3:1 for beating, filter, and repeat four times. And silicon tetrafluoride (SiF 4 ) Volatility method to determine the silica content.

[0062] (2), dilute the liquid lye to about 12%.

[0063] (3) Washing the secondary boron mud (mainly composed of active silicon dioxide) obtained after acidolysis and filtration to contain sulfate ≤ 0.5%. Then use a sodium hydroxide solution with a concentration of 12%, and mix according to 115% of the theoretical amount, soak and dissolve for 120 minutes under the condition of 95-100°C, so that the silicon dioxide in the boron mud is converted into sodium silicate, and obtained by filtration. Liquid Sodium Silicate. The resulting residue was filtered and discarded.

[0064] Chemical reaction: 2NaOH+SiO 2 →Na 2 SiO 3 +H 2 o

[0065] Determination of SiO in waste residue by silicon tetrafluoride ...

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Abstract

The invention discloses a method for preparing precipitated silicon dioxide by using boron slurry sludge; acid pickling boron slurry sludge is used for preparing the food-grade magnesium carbonate and obtaining secondary sludge; alkaline liquor is added into the secondary sludge and acid treatment is carried out to obtain silicic acid sol; finally, sodium silicate solution is added to precipitate silicon dioxide sediment. The invention leads the conversion rate of the magnesium in the boron slurry to be more than or equal to 87 percent and the yield of the silicon dioxide to be 76 percent to 77 percent. The method solves the comprehensive utilization problem of the silicon dioxide, which is not solved by the existing boron slurry comprehensive utilization technology, thus not only improving the comprehensive utilization rate of resources, but also solving the bad influence of the secondary boron slurry to environment fundamentally.

Description

technical field [0001] The invention relates to the comprehensive utilization of chemical waste, in particular to the comprehensive utilization of waste boron sludge in the preparation of borax. Background technique [0002] Over the past 50 years since the founding of the People's Republic of China, my country's borax industry has developed rapidly. The waste discharged during the production process - boron sludge has accumulated more than 16 million tons in Liaoning, the main producing area, and is still growing at a rate of more than 1 million tons per year. . The main components of boron mud are: MgO, SiO 2 And Fe, Ca, Al, B and other components. Its aqueous solution is alkaline, with a pH value of 8-9. Its large accumulation has caused serious pollution to the local environment. [0003] Boron mud contains higher MgO and SiO 2 , Yingkou boron mud wet base measured content were 33% and 24.6%, can be used to extract a variety of magnesium, silicon compounds. The comp...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01B33/113C01F5/24
Inventor 肖莹
Owner 肖莹
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