Preparation method for preparing anti-hydration magnesia-calcia refractory through phosphate tailing

A technology for refractory materials and phosphorus tailings, which is applied in the field of phosphorus chemical industry, can solve the problems of easy hydration of magnesium-calcium refractories and low utilization rate of phosphorus tailings, and achieves improved hydration resistance, good compressive strength at room temperature, Solve the effect of low utilization

Pending Publication Date: 2019-10-25
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention has high volume density and good normal temperature compressive strength hydration-resistant magnesium-calcium refractory material, the preparation process is simple, easy to operate, mainly uses phosphorus tailings as the main raw material, and solves the low utilization rate of phosphorus tailings and the problem of magnesium Hydration problem of calcareous refractories

Method used

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  • Preparation method for preparing anti-hydration magnesia-calcia refractory through phosphate tailing

Examples

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Effect test

Embodiment 1

[0034] Example 1. A method for preparing hydration-resistant magnesia-calcium refractory materials using phosphorus tailings, which is prepared according to the following steps;

[0035] A. Dry the phosphorus tailings at 100°C for 22 hours, crush, grind, pass through a 100-mesh sieve, and perform pre-calcination. The heating rate of the pre-calcination is 8°C / min. Take it out at room temperature, grind it, and pass through a 40-mesh sieve to obtain pre-calcined phosphorus tailings;

[0036] B. Mix 100kg of pre-calcined phosphorus tailings, 1kg of nano-titanium dioxide, 1kg of nano-zirconia and 7kg of binder evenly, molding at a molding pressure of 90Mpa, loading temperature of 100°C, and drying time of 10h. After drying Naturally cool to room temperature, calcined, the calcined temperature is 1500°C, and the calcined time is 2h to obtain the finished product.

Embodiment 2

[0037] Example 2. A method for preparing hydration-resistant magnesia-calcium refractory materials using phosphorus tailings, which is prepared according to the following steps;

[0038] A. Dry the phosphorus tailings at 110°C for 23 hours, crush, grind, pass through a 150-mesh sieve, and perform pre-calcination. The heating rate of the pre-calcination is 9°C / min. Take it out at room temperature, grind it, and pass through a 100-mesh sieve to obtain pre-calcined phosphorus tailings;

[0039] B. Mix 120kg of pre-calcined phosphorus tailings, 2kg of nano-titanium dioxide, 2kg of nano-zirconia and 8kg of binder evenly. The molding pressure is 110Mpa, the loading temperature is 120°C, and the drying time is 11h. After drying Naturally cool to room temperature, calcined, the calcined temperature is 1550°C, and the calcined time is 2h to obtain the finished product.

Embodiment 3

[0040] Example 3. A method for preparing hydration-resistant magnesia-calcium refractory materials using phosphorus tailings, which is prepared according to the following steps;

[0041] A. Dry the phosphorus tailings at 110°C for 24 hours, crush, grind, pass through a 200-mesh sieve, and perform pre-calcination. The heating rate of the pre-calcination is 10°C / min. Take it out at room temperature, grind it, and pass through a 150-mesh sieve to obtain pre-calcined phosphorus tailings;

[0042]B. Mix 110kg of pre-calcined phosphorus tailings, 3kg of nano-titanium dioxide, 3kg of nano-zirconia and 9kg of binder evenly, molding at a molding pressure of 90Mpa, loading temperature of 120°C, and drying time of 13h. After drying Naturally cool to room temperature, calcined, the calcined temperature is 1600°C, and the calcined time is 2h to obtain the finished product.

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Abstract

The invention discloses a preparation method for preparing an anti-hydration magnesia-calcia refractory through phosphate tailing. The anti-hydration magnesia-calcia refractory is prepared according to the following steps that A, the phosphate tailing is dried, smashed, ground, sieved, precalcined, naturally cooled to the room temperature to be taken out, ground and sieved, and thus precalcined phosphate tailing is obtained; and B, the precalcined phosphate tailing, nano-titania, nano zirconium dioxide and a binding agent are mixed evenly, and through forming, drying and calcining, a finishedproduct is obtained. The anti-hydration magnesia-calcia refractory with the high volume density and good normal-temperature compressive strength is obtained, the preparation process is simple and easyto operate, the phosphate tailing is mainly taken as a main raw material, and the problems that the phosphate tailing is low in utilization rate, and the magnesia-calcia refractory is prone to beinghydrated are solved.

Description

technical field [0001] The invention belongs to the technical field of phosphorus chemical industry, and in particular relates to a method for preparing a hydration-resistant magnesium-calcium refractory material by utilizing phosphorus tailings. Background technique [0002] Phosphorus tailings are the tailings left after phosphorus concentrate is extracted from phosphate rock. Guizhou, as a major province of phosphorus chemical industry, produces a huge amount of phosphorus tailings every year. Phosphorus tailings are not only a waste of resources, but also pose a certain threat to the surrounding environment. Therefore, the development and utilization of phosphorus tailings is imminent. At present, the research on phosphorus tailings mainly focuses on the re-flotation of phosphorus tailings to recover P 2 o 5 , or as an additive to produce building materials and organic phosphate fertilizers, there are problems such as low dosage and low recovery rate, and a large amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
CPCC04B35/62204C04B35/66C04B2235/3232C04B2235/3244C04B2235/5454C04B2235/602C04B2235/606C04B2235/656C04B2235/6567C04B2235/77C04B2235/96
Inventor 张煜林小化聂登攀曹建新张鹏段江飞
Owner GUIZHOU UNIV
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