Comprehensive utilization method for high-iron high-calcium high-silicon waste magnesite and boron mud

A magnesite and high-calcium technology, which is applied in chemical instruments and methods, preparation of organic compounds, carboxylate preparation, etc., can solve the problem of limiting the reuse of waste magnesite resources, and achieve low harmful impurities and simple process , the effect of small lattice size

Active Publication Date: 2020-05-15
辽宁科大中驰镁建材科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These all limit the resource reuse of abandoned magnesite, which needs to be solved urgently

Method used

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  • Comprehensive utilization method for high-iron high-calcium high-silicon waste magnesite and boron mud
  • Comprehensive utilization method for high-iron high-calcium high-silicon waste magnesite and boron mud
  • Comprehensive utilization method for high-iron high-calcium high-silicon waste magnesite and boron mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The implementation steps of the present invention are as follows:

[0036] (1) Calcining high-iron, high-calcium and high-silicon waste magnesite in a rotary kiln, the calcination temperature is 1200°C, and the calcination time is 1.5h to obtain light-calcined magnesia, which is ground after cooling, with a fineness of 325 mesh and a passing rate of 95 %, the hydration activity of the prepared light-burned magnesium oxide powder is 71.1%;

[0037] (2) Weigh 1 part of oxalic acid, 1 part of glycerol, 2 parts of fly ash, 27 parts of lightly burned magnesium oxide powder, 13.7 parts of magnesium sulfate heptahydrate, 0.3 parts of citric acid, 25 parts of water, 1 part of Glass fiber silk, 25 parts of boron mud, 1 part of dolomite, 2 parts of sawdust, 1 part of perlite. Mix oxalic acid and glycerol in water to obtain a mixed solution, and dry mix fly ash, magnesium sulfate heptahydrate, citric acid, glass fiber, dolomite, sawdust and perlite;

[0038] (3) Pour lightly bur...

Embodiment 2

[0045] The implementation steps of the present invention are as follows:

[0046] (1) Same as embodiment 1;

[0047](2) Weigh 0.1 parts of oxalic acid, 0.1 parts of glycerol, 2 parts of fly ash, 40 parts of light-burned magnesium oxide powder, 25 parts of magnesium sulfate heptahydrate, 0.3 parts of citric acid, 25 parts of water, 2.1 parts by weight Glass fiber, 1 part of dolomite, 2 parts of sawdust, 1 part of perlite. Mix oxalic acid and glycerol in water to obtain a mixed solution, and dry mix fly ash, magnesium sulfate heptahydrate, citric acid, glass fiber, dolomite, sawdust and perlite;

[0048] (3)-(5) are the same as embodiment 1.

[0049] The cured samples were tested, and the performance data are as follows:

[0050]

Embodiment 3

[0052] The implementation steps of the present invention are as follows:

[0053] (1) Same as embodiment 1;

[0054] (2) Weigh 0.1 part of oxalic acid, 0.1 part of glycerol, 0.5 part of fly ash, 40 parts of lightly burned magnesium oxide powder, 21 parts of magnesium sulfate heptahydrate, 0.3 part of citric acid, 22 parts of water, 1 part of Glass fiber filaments, 5 parts of dolomite, 5 parts of sawdust, 5 parts of perlite. Mix oxalic acid and glycerol in water to obtain a mixed solution, and dry mix fly ash, magnesium sulfate heptahydrate, citric acid, glass fiber, dolomite, sawdust and perlite;

[0055] (3)-(5) are the same as embodiment 1.

[0056] The cured samples were tested, and the performance data are as follows:

[0057]

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Abstract

The invention discloses a comprehensive utilization method of high-iron high-calcium high-silicon waste magnesite and boron mud, which comprises the following steps: calcining waste magnesite in a rotary kiln, pulverizing light calcined magnesia powder, and leaching iron and calcium with an oxalic acid and glycerol alcohol solution to obtain calcium oxalate and complex iron oxalate; and adding magnesium sulfate and boric sludge, and carrying out stirring to prepare a magnesium building material product. According to the invention, high-iron high-calcium high-silicon waste magnesite and boron mud are used as raw materials, iron and calcium impurities are leached out through oxalic acid, glycerol alcohol and oxalic acid are subjected to graft polymerization under the hydration heat release condition of magnesium oxysulfate cement, hydroxyl in a formed polymer reacts with boron to solidify boron, then the boron is further solidified through a magnesian cementing material, secondary utilization of solid waste is achieved, and the method is environmentally friendly. The preparation method is simple, the light calcined magnesia powder prepared by using the rotary kiln is small in grain size, high in activity, relatively low in cost, safe, non-toxic, low in leaching harmful impurities and large in dosage, and is used for building material products, and the prepared building material product is relatively high in whiteness and good in performance.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste, in particular to a method for comprehensive utilization of high-iron, high-calcium, and high-silicon waste magnesite and boron mud. Background technique [0002] In recent years, with the high mining of magnesite resources, a large amount of high-iron, high-calcium and high-silicon abandoned magnesite that is difficult to use has been produced. Every ton of high-quality magnesite mined will produce 3-4 tons of abandoned ore. These abandoned ore are mainly One or several of iron, calcium, and silicon are high in content and cannot be effectively utilized. High ferrosilicon content will form low-temperature eutectic minerals, which is not conducive to the preparation of refractory materials, and high silicon-calcium content will easily form low-temperature phase calcium and magnesium. Olivine, reduces material refractoriness. Boron mud is mainly a kind of abandoned tailings after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C04B28/30C07C51/41C07C55/07
CPCC04B2/102C04B28/30C07C51/412C04B2201/50C04B2111/00017C04B9/00C04B24/04C04B24/026C04B18/08C04B24/06C04B14/42C04B14/26C04B18/26C04B14/18C04B18/04C07C55/07Y02W30/91
Inventor 毕万利胡智淇关岩赵九野孙美硕
Owner 辽宁科大中驰镁建材科技有限公司
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