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A kind of alkali slag magnesium oxychloride cement and its preparation method and application

A technology of magnesium oxychloride cement and alkali slag, which is applied in the field of alkali slag magnesium oxychloride cement and its preparation, can solve the problems that alkali slag has not been effectively treated, large-scale industrial production cannot be produced, and product quality is unstable. Strength, excellent fire resistance, and the effect of good fire resistance

Active Publication Date: 2022-02-15
GUANGZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some dry the alkali slag and add it to Portland cement to produce concrete or mortar. Because the alkali slag contains a lot of chloride ions and sulfate ions, it will corrode the steel bars and cause a series of engineering quality problems such as concrete expansion.
Some use alkali slag to produce β-type hemihydrate gypsum for construction, but this method has high production cost and little utilization value
Others use alkali slag to produce cement clinker and chemical fertilizers. These methods have a series of problems such as secondary pollution, high energy consumption, and unstable product quality, and cannot be industrialized on a large scale. Therefore, alkali slag has not been effectively used at present. deal with

Method used

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  • A kind of alkali slag magnesium oxychloride cement and its preparation method and application
  • A kind of alkali slag magnesium oxychloride cement and its preparation method and application
  • A kind of alkali slag magnesium oxychloride cement and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to attached figure 1 Technological process, prepare the magnesium oxychloride cement with soda making waste slag as admixture, take the following raw materials by weight according to the proportion: 90 parts of light-burned magnesium oxide powder, halogen sheet (main component MgCl 2 ·6H 2 O) 90 parts, water 55 parts, wet alkali slag 25 parts, sodium hexaphosphate metaphosphate (dispersant) 1 part.

[0032] Specifically include the following steps:

[0033] S1. dissolving the brine slices in water to form a brine solution;

[0034] S2. adding the dispersant into the wet alkali slag;

[0035] S3. Mix the brine solution in step S1 with the wet alkali slag mixed in step S2;

[0036] S4. Add the burned magnesia powder to the wet alkali slag mixed in step S3, and stir evenly to form cement slurry;

[0037] S5. Cast the cement slurry in step S4 into a mold, demould after curing at room temperature, and continue curing to obtain the magnesium oxychloride cement....

Embodiment 2

[0043] According to attached figure 1 Technological process, prepare the magnesium oxychloride cement with soda making waste slag as admixture, take the following raw materials by weight in proportion: 100 parts of lightly burned magnesium oxide powder, halogen sheet (main component MgCl 2 ·6H 2 O) 90 parts, water 50 parts, wet alkali residue 30 parts, sodium dodecylbenzenesulfonate (dispersant) 1.5 parts.

[0044] Specifically include the following steps:

[0045] S1. dissolving the brine slices in water to form a brine solution;

[0046] S2. adding the dispersant into the wet alkali slag;

[0047] S3. Mix the brine solution in step S1 with the wet alkali slag mixed in step S2;

[0048] S4. Add the burned magnesia powder to the wet alkali slag mixed in step S3, and stir evenly to form cement slurry;

[0049] S5. Cast the cement slurry in step S4 into a mold, demould after curing at room temperature, and continue curing to obtain the magnesium oxychloride cement.

[0050...

Embodiment 3

[0056] According to attached figure 1 Technological process, prepare the magnesium oxychloride cement with soda making waste slag as admixture, take the following raw materials by weight according to the proportion: 98 parts of light-burned magnesium oxide powder, halogen sheet (main component MgCl 2 ·6H 2 O) 80 parts, 65 parts of water, 40 parts of wet alkali slag, 2 parts of polymerized carboxylic acid comb graft copolymer (dispersant).

[0057] Specifically include the following steps:

[0058] S1. dissolving the brine slices in water to form a brine solution;

[0059] S2. adding the dispersant into the wet alkali slag;

[0060] S3. Mix the brine solution in step S1 with the wet alkali slag mixed in step S2;

[0061] S4. Add the burned magnesia powder to the wet alkali slag mixed in step S3, and stir evenly to form cement slurry;

[0062] S5. Cast the cement slurry in step S4 into a mold, demould after curing at room temperature, and continue curing to obtain the magne...

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PUM

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Abstract

The invention discloses a method for resource utilization of soda making waste residue. Soda slag is used as magnesium oxychloride cement admixture, first halogen sheet (main component MgCl 2 ·6H 2 O), wet shape alkali slag, water, and dispersant are stirred evenly and configured into a mixed solution, then added light-burned magnesium oxide powder and stirred evenly to form a cement slurry, and the magnesium oxychloride cement material with alkali slag as an admixture is obtained, which is applicable It is used in the preparation of fireproof boards, building flat boards and mechanical equipment packaging boxes, etc. The present invention uses alkali slag as an admixture of magnesium oxychloride cement, has a large amount of alkali slag and a simple preparation process, can reduce the cost of filter magnesium cement products, and realize resource utilization of alkali-making waste residue, and the prepared magnesium oxychloride cement has Fast setting, early strength, high strength and other characteristics.

Description

technical field [0001] The invention relates to the technical field of magnesium oxychloride cement preparation, and more specifically relates to an alkali slag magnesium oxychloride cement and a preparation method and application thereof. Background technique [0002] As an important basic chemical raw material, soda ash is widely used in metallurgy, building materials, papermaking, medicine, chemical industry, food and other industries. At present, the annual output of soda ash in the world is about 30 million tons, of which the ammonia soda method is about 20 million tons, and nearly 20 million cubic meters of alkali slag is produced every year. my country's ammonia-soda alkali production can reach 14.21 million tons per year. Due to the characteristics of the ammonia soda ash production process, about 0.3 tons of soda residue needs to be discharged for every ton of soda ash produced. A factory with an annual output of 800,000 tons of soda ash discharges about 240,000 to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B9/02C04B9/20
CPCC04B9/02C04B9/20
Inventor 李从波曹正伟谢谦黄庆滔蒋林峰
Owner GUANGZHOU UNIVERSITY
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