Method for toughening gypsum by means of nickel slag and product prepared through method

A nickel slag and toughening technology, applied in the field of materials, can solve the problems of complex preparation process and high energy consumption, achieve high toughness, save resources, and be conducive to sustainable development

Active Publication Date: 2017-01-04
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In view of the complex preparation process and high energy consumption of the existing toughening methods, in order to meet the requirements of sustainable development, the present invention provides a method for toughening gypsum with nickel slag and its products. No need to add organic matter, and realize the comprehensive utilization of waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 238g of nickel slag, 152g of desulfurized gypsum, 570.6g of sugar filter mud and 39.4g of bauxite, put them in a planetary mill, grind for 20min, and the specific surface area is 300m 2 / kg, add 400g water and 0.02% polycarboxylate, take out and pour the mixture into the mould, demoulding after molding, to obtain a block sample;

[0023] Put the above sample in a standard curing box (temperature 20°C, relative humidity 95%) for 3 days, then move it to a digital display constant temperature stirring cycle curing box that has been heated to a set temperature of 80°C, and maintain it at a constant temperature for 12 hours After that, the mechanical properties of the samples were measured. The flexural strength of nickel slag thermal curing products is 5.31MPa, the compressive strength is 8.26MPa, and the impact resistance is 9.85kJ / m 2 .

Embodiment 2

[0025] Mix 169.4g of nickel slag, 219.2g of phosphogypsum, 460.8g of calcium carbide slag and 150.6g of coal gangue and put them in a planetary mill, grind for 30min, and the specific surface area is 350m 2 / kg, add 550g of water and 5% of ordinary Portland cement, take it out, pour the mixture into the mold, demould after molding, and obtain a block sample;

[0026] Put the above samples in a standard curing box (temperature is 20°C, relative humidity is 95%) and maintain for 4 days, then move to a digital display constant temperature stirring circulation curing box that has been heated to a set temperature of 120°C, and maintain at a constant temperature. After 3 h, the mechanical properties of the samples were measured. The flexural strength of nickel slag thermal curing products is 5.57MPa, the compressive strength is 10.13MPa, and the impact resistance is 10.03kJ / m 2 .

Embodiment 3

[0028] Mix 195g of nickel slag, 192.5g of phosphogypsum, 480.2g of calcium carbide slag and 132.2g of coal gangue and put them in a planetary mill, grind for 20min, and the specific surface area is 350m 2 / kg, add 550g of water and 7% high-alumina cement, take it out, pour the mixture into the mold, demould after molding, and obtain a block sample;

[0029] Put the above samples in a standard curing box (temperature is 20°C, relative humidity is 95%) and maintain for 5 days, then move to a digital display constant temperature stirring circulation curing box that has been heated to a set temperature of 50°C, and maintain at a constant temperature. After 24 h, the mechanical properties of the samples were measured. The flexural strength of nickel slag thermal curing products is 4.48MPa, the compressive strength is 7.48MPa, and the impact resistance is 9.59kJ / m 2 .

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Abstract

The invention discloses a method for toughening gypsum by means of nickel slag and a product prepared through the method. The method comprises the steps that the nickel slag, industrial gypsum, calcium-containing waste and aluminum-containing waste are mixed to be uniform, water is added, grinding is conducted for 20 min, the mixed material is poured into a mold, demolding is conducted after molding is achieved, and a sample is obtained, wherein the water-cement ratio ranges from 0.4 to 0.55; after standard curing is conducted on the sample for 3 d to 5 d, hydrothermal curing is conducted for 3 h to 24 h at the curing temperature of 50 DEG C to 135 DEG C, and the nickel slag self-toughening product is obtained. The nickel slag thermal curing product prepared through the method has the good toughness, organic matter harmful to a human body does not need to be added, and fibers do not need to be mixed.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for toughening gypsum with nickel slag and a product thereof. Background technique [0002] Nickel slag is a common industrial waste, the source of which is nickel and stainless steel smelting plants. The formation of nickel slag is to turn the molten nickel slag into granulated blast furnace slag after water quenching. The chemical composition of nickel slag varies greatly due to the source of nickel and different methods of smelting, but the main chemical components of most nickel slag are silicon dioxide and iron oxide, and the nickel slag after water quenching is brittle. , the comprehensive utilization rate of nickel slag is low, and it is mostly used as concrete aggregate. According to statistics, until now, the nickel slag accumulated in the open air has exceeded 3.3×10 7 t, this wastes a lot of land resources, and also pollutes the environment, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/14B28B1/08B28B11/24
CPCB28B1/08B28B11/24B28B11/243C04B18/144C04B28/143C04B28/144C04B2201/50C04B22/002C04B18/0418C04B14/303C04B24/24C04B18/0481C04B18/12C04B7/02C04B7/32Y02W30/91
Inventor 郭伟王春张益铭刘婷杜宇焦宝祥
Owner YANCHENG INST OF TECH
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