Method of synthesizing magnesium silicate building material product by utilizing boron mud and coal ashes

A technology for synthesizing magnesium silicate and fly ash, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve unsatisfactory mechanical properties, limit the effective utilization rate of boron mud, and increase production cost and other issues, to achieve the effect of low price, high utilization rate, and not easy to lose

Inactive Publication Date: 2014-02-05
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In comparison, the sintering process can increase the activity of boron mud, so that it can be fused with other minerals to form products with good density and high strength, but the energy consumption is relatively large, which increases the production cost; while in the normal temperature environment, boron The activity of the mud component is low, and it can only be used as an inert filler or as a substitute for clay. Even if it is matched with cement or lime with higher activity, the performance in terms of mechanical properties is still not satisfactory, which limits the use of boron mud. effective utilization

Method used

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  • Method of synthesizing magnesium silicate building material product by utilizing boron mud and coal ashes
  • Method of synthesizing magnesium silicate building material product by utilizing boron mud and coal ashes
  • Method of synthesizing magnesium silicate building material product by utilizing boron mud and coal ashes

Examples

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Effect test

Embodiment 1

[0040] Boron mud residue from a chemical plant in Dashiqiao, containing MgCO 3 25%, roasted at 600 °C for 3 hours, crushed through a 150-mesh sieve; weighed 1 kg of roasted coal, mixed with 1 kg of fly ash (grade II, produced by Shenhai Thermal Power Plant), and then added 0.2 kg of tap water to mix well; weighed 200 g The mixture was placed in a compression mold, and a cylindrical test block with a height and a diameter of 30 mm was obtained through 20 kN pressure molding. After molding, the sample was placed in a hydrothermal reaction kettle, heated to 160°C, kept at a constant temperature for 9 hours, and then cooled naturally. The apparent density of the hydrothermally cured sample after drying is about 1.6 g / cm 3 , The average compressive strength is 10MPa. MgO in roasted boron sludge and active SiO in fly ash during hydrothermal treatment 2 with Al 2 o 3 A chemical combination reaction occurs to generate hydrated magnesium silicate (serpentine phase) and other react...

Embodiment 2

[0042] The difference from Example 1 is that the calcination temperature is increased to 850°C, the calcination time is 0.75h, and at the same time, hydrated lime is added to the reaction mixture as a strength development accelerator, and the dosage is 5% of the mass of boron mud; the average compressive strength of the obtained samples is It can be increased to about 15MPa.

Embodiment 3

[0044] The difference from Example 1 is that the hydration reaction temperature is increased to 240° C. and kept at a constant temperature for 6 hours; the average compressive strength of the obtained samples can be increased to about 18 MPa.

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Abstract

The invention discloses a comprehensive utilization method of industrial waste residue by utilizing a process method of synthesizing a magnesium silicate building material product by utilizing boron mud and coal ashes. The method adopts boron mud and coal ashes as base materials, and comprises roasting and activating of boron mud as well as hydrothermal combination reaction with the coal ashes. The boron mud is firstly roasted and activated under the condition of 600 DEG C-1000 DEG C, then, the roasted boron mud, the coal ashes, a structural development accelerator and water are uniformly mixed in a mass ratio of 1:(0.25-2.50):(0.01-0.10):(0.1-1.0), placed in a sealed container after being mould-pressed and formed under 3 MPa-50 MPa, and reacted for 4-12 hours under the saturated steam condition of 160 DEG C-240 DEG C. The boron mud is roasted and activated, so that a magnesium oxychloride component in the boron mud is decomposed into MgO; meanwhile, impurities such as clay minerals are dehydrated and activated, a roasting furnace is kept well-ventilated, materials quickly get in / get out of a constant-temperature furnace, and roasting and activating time is shortened with temperature rise. The method disclosed by the invention is suitable for converting and curing the boron mud, and is further applicable to recycling other industrial waste containing MgCO3, Mg(OH)2 or MgO, and the like.

Description

technical field [0001] The invention relates to a resource utilization technology of industrial waste residue, specifically a method for synthesizing magnesium silicate building material products by using boron mud and fly ash [0002] After curing, the products have high mechanical strength and durability, and can be used as building materials such as load-bearing / non-load-bearing bricks and sidewalk bricks. Background technique [0003] Boron mud is the waste discharged from the production of hydrated sodium borate (borax) by the carbon soda method in the boron chemical industry. Its main chemical components are MgO and SiO 2 , mostly magnesite (MgCO 3 ) and forsterite (2MgO SiO 2 ) form, the total content accounts for about 70% of the total mass, of which MgCO 3 Roughly in the range of 10%~30%. Due to the high alkalinity (pH = 8 ~ 10) and high fineness (about 100 mesh), boron mud is easy to pulverize and scatter after dehydration and drying, causing serious dust p...

Claims

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Application Information

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IPC IPC(8): C04B28/24C04B18/30
CPCY02W30/91
Inventor 佟钰刘俊秀王琳王宝金
Owner SHENYANG JIANZHU UNIVERSITY
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