Concrete high-efficiency expanding agent and preparation method thereof

A high-efficiency expansion agent and concrete technology, applied in the direction of solid waste removal, etc., can solve the problems of rising price of natural anhydrite, cost pressure of expansion agent production enterprises, etc.

Inactive Publication Date: 2009-12-23
贵州省建筑材料科学研究设计院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the increase in market demand for expansion agents and the closure of some gypsum mines with potential safety hazards by the government for safety reasons, the price of natural anhydrite has continued to rise, bringing huge cost pressures to expansion agent manufacturers

Method used

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  • Concrete high-efficiency expanding agent and preparation method thereof
  • Concrete high-efficiency expanding agent and preparation method thereof
  • Concrete high-efficiency expanding agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Embodiment 1 of the present invention: the preparation of concrete high-efficiency expansion agent:

[0076] Take first-grade bauxite (Al 2 o 3 Content 83%) 47kg and limestone 53kg, mix, grind together until the fineness is 4900 hole sieve ≤ 8%, then make raw meal balls with a diameter of φ10 ~ 15mm, calcined in a rotary kiln at 1380°C for 50 minutes , to obtain special high-alumina clinker; take phosphogypsum, and calcined at 650°C for 80 minutes; mix 60kg of calcined phosphogypsum with 40kg of special high-alumina clinker, and use a ball mill to grind until the residue on the 4900-hole sieve is ≤10%. That is to say, the concrete high-efficiency expansion agent conforming to JC476-2001 expansion agent standard is obtained, the 7-day limit expansion rate is more than 0.025%, and the expansion agent content is 6-8%.

Embodiment 2

[0077] Embodiment 2 of the present invention: get first-grade bauxite (Al 2 o 3 content 75%) 44kg and limestone 56kg, mixed and ground together until the fineness is 4900 mesh sieve residue < 10%, then made into raw meal balls of φ10 ~ 15mm, calcined at 1350 ℃ in Liboer kiln for 40 Minutes to get special high alumina clinker; take phosphogypsum, calcined at 600°C for 70 minutes; mix 65kg of calcined phosphogypsum with 35kg of special high alumina clinker, and use a ball mill to grind until the residue on the 4900-hole sieve <12% , that is, a high-efficiency concrete expansion agent that meets the JC476-2001 expansion agent standard.

Embodiment 3

[0078] Embodiment 3 of the present invention: get bauxite (Al 2 o 3 content 70%) 50kg and limestone 50kg, mix and grind together until the fineness is 4900 hole sieve sieve ≤ 10%, then make raw meal balls of φ10 ~ 15mm, calcined in a rotary kiln at 1400°C for 0.5 hours, Obtain special high-alumina clinker; take phosphogypsum, calcined at 700°C for 1 hour; mix 60 kg of calcined phosphogypsum with 40 kg of special high-alumina clinker, and use a ball mill to grind until the residue on the 4900-hole sieve ≤ 12%, that is Concrete high-efficiency expansion agent that meets JC476-2001 expansion agent standard.

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Abstract

The invention discloses a concrete high-efficiency expanding agent and a preparation method thereof. By being calculated according to weight percentage, the concrete high-efficiency expanding agent is prepared by mixing and grinding 55 to 65% calcined ardealite and 45 to 35% specially-made high alumina clinker; and the specially-made high alumina clinker is cement expansion clinker which is obtained by the grinding and calcining of 44% to 50% of bauxite and 56% to 50% of limestone. The invention adopts calcined phosphogypsum to replace natural anhydrite to prepare the concrete high-efficiency expanding agent, all the indexes of the obtained expanding agent conform to the requirements of JC476-2001 standard, 7 days limited expanding rate is more than or equal to 0.025%, and the dosing amount of the expanding agent is 6 to 8%; therefore, the invention not only fully utilizes industrial wastes, changes wastes into valuables, but also reduces occupation to field and pollution to the environment of the wastes, achieves the purposes of saving resources, protecting ecological environment and guaranteeing the sustainable development of national economy, simultaneously reduces the production cost of the expanding agent greatly, and has obvious economic benefit and good market prospect.

Description

Technical field: [0001] The invention relates to a high-efficiency concrete expansion agent and a preparation method thereof, belonging to the technical field of waste residue utilization. Background technique: [0002] Phosphate mining enterprises discharge a large amount of powdery solid waste phosphogypsum during the production of phosphorus chemical products such as heavy calcium and superphosphate, which not only occupies cultivated land, but also pollutes the environment. It has always been a headache for phosphorus chemical enterprises and an urgent problem to be solved. With the increasing volume of phosphorus chemical products in my country, the annual discharge of phosphogypsum has reached 8 million tons. Therefore, it is imminent to speed up the development and utilization of phosphogypsum. [0003] The main component of phosphogypsum is dihydrate gypsum, and contains a certain amount of P 2 o 5 , F and radioactive radium (Ra-226) and other harmful substances t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14B09B3/00
Inventor 王勇张保如李晓东吴仁刚刘光先
Owner 贵州省建筑材料科学研究设计院有限责任公司
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