Unlock instant, AI-driven research and patent intelligence for your innovation.

Direct hydrothermal method for boric sludge solidification

A boron mud and direct technology, which is applied in the direct hydrothermal field of boron mud solidification, can solve the problems of low utilization rate of boron mud, and achieve the effects of high utilization rate, lower production cost and less loss.

Inactive Publication Date: 2014-01-01
SHENYANG JIANZHU UNIVERSITY
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At room temperature, due to insufficient activity, boron mud can only be used as an inert filler, such as prepared cement, mortar, etc., and must be used in conjunction with materials with high hydration activity such as cement, lime, etc., and the utilization rate of boron mud is relatively low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Direct hydrothermal method for boric sludge solidification
  • Direct hydrothermal method for boric sludge solidification
  • Direct hydrothermal method for boric sludge solidification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Contains 30% MgCO 3 After air-drying and pulverizing the boron mud, weigh 1kg, mix it with 0.7kg fly ash (II grade), and then add 0.17kg tap water (10% of the solid content, add 5g magnesium chloride hexahydrate)) and mix well; Weigh 200g of the mixture and place it in a compression mold, and press 20kN to form a cube test piece with a side length of 50mm (up to 8 pieces). After molding, put the sample into the hydrothermal reaction kettle, and put 0.5kg of wet slaked lime (70% water into the lime) at the same time; raise the temperature to 200°C, keep the temperature constant for 6 hours, and then cool naturally. After hydrothermal curing, the apparent density of the sample after drying is about 1.6g / cm 3 , The average compressive strength is 10MPa. XRD structure analysis shows that compared with the reaction mixture before hydrothermal treatment, the characteristic diffraction peaks of the solidified body attributed to magnesite are significantly reduced, and th...

Embodiment 2

[0031] The difference from Example 1 is that during the batching and mixing process, no reaction aid—magnesium chloride hexahydrate was added, and the average compressive strength of the obtained sample was about 6MPa.

Embodiment 3

[0033]The difference from Example 1 is that the strength of the cured body can be increased to more than 12 MPa when the hydrothermal reaction temperature is increased to 240° C. and the reaction time remains unchanged.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a comprehensive utilization method for waste residue boric sludge in the boric industry, in particular to a direct hydrothermal conversion method for boric sludge solidification. The method uses the boric sludge and coal ash to serve as basic raw materials, complets conversion reaction from magnesite (MgCO3) to brucite (Mg(OH)2) in the boric sludge and an in-situ hydrothermal combination reaction between the Mg(OH)2 and the coal ash in a 160-240 DEG C saturated steam environment, and finally obtains block solid with high mechanical strength and durability. In order to quicken reaction speed and improve percent conversion, humid slaked lime is led in the hydrothermal environment to consume CO2 produced by the conversion reaction, and simultaneously certain quantity of soluble magnesium salt is added for serving as a reaction assistant. The method is suitable to conversion solidification of the boric sludge and suitable to recycle of other industrial wastes containing MgCO3.

Description

technical field [0001] The invention relates to a resource utilization technology of industrial waste residue, specifically a direct hydrothermal method for curing boron mud. The cured product has high mechanical strength and durability, and can be used as wall and floor tiles, sidewalk tiles, etc. Building materials products use. Background technique [0002] Boron slime is one of the main wastes in the boron chemical industry. Usually, 1 ton of borax produced by the carbon-soda method will discharge 4 tons of boron slime. Only Liaoning Province alone discharges 1 million tons of boron mud every year. The main chemical components of boron mud are MgO and SiO 2 , with magnesite (MgCO 3 ) and forsterite (2MgO SiO 2 ) form, the total content accounts for about 70% of the total mass, of which MgCO 3 Most of them fluctuate at 10%~30%, so boron mud is mostly alkaline, with a pH value of 8~10; the fineness is large, and the particle size is about 100 mesh. For a long time, th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 佟钰刘俊秀夏枫王琳王宝金
Owner SHENYANG JIANZHU UNIVERSITY