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Autoclaved brick prepared by utilizing stone coal vanadium extraction tailings as main raw material and preparation method thereof

A technology for extracting vanadium tailings and main raw materials, which is applied in the field of autoclaved bricks and its preparation, and can solve the problems of low utilization rate of vanadium tailings from stone coal, inability to use stone coal to extract vanadium tailings in large quantities, and high processing costs. , to achieve the effect of solving the problem of excessive drying shrinkage, which is beneficial to environmental protection and low production cost

Active Publication Date: 2013-09-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method still has the problems of low utilization rate and high treatment cost for the utilization of vanadium extraction tailings from stone coal, and cannot utilize large quantities of vanadium extraction tailings from stone coal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An autoclaved brick with vanadium extraction tailings from stone coal as a main raw material and a preparation method thereof. First, 50-65wt% of pretreated vanadium extraction tailings, 20-30wt% of fly ash and 15-25wt% of slaked lime are used as raw materials, and then 16-18wt% of water is added to the raw materials, stirred evenly, and pressed into shape. Rest for 12 hours; then put the rested bricks into the autoclave for autoclaving for 5~8 hours, cool down naturally, and leave the autoclave, that is, the autoclaved bricks with the tailings of vanadium extracted from stone coal as the main raw material.

[0023] In this embodiment: the press forming refers to pressing the adobe into a brick on a pressure forming machine, and the pressure of the press forming is 15-18 MPa; the temperature of the autoclave curing is 180-200° C., and the pressure of the autoclave curing is 1.15-1.25 MPa.

Embodiment 2

[0025] An autoclaved brick with vanadium extraction tailings from stone coal as a main raw material and a preparation method thereof. First, 65-70wt% of pretreated vanadium extraction tailings, 15-25wt% of fly ash and 10-15wt% of slaked lime are used as raw materials, and then 14-16wt% of water is added to the raw materials, stirred evenly, and pressed into shape. Rest for 12 hours; then put the rested bricks into the autoclave for autoclaving for 5-8 hours, cool down naturally, and leave the autoclave to obtain autoclaved bricks with vanadium extraction tailings from stone coal as the main raw material.

[0026] In this embodiment: the press forming refers to pressing the adobe into a brick on a pressure forming machine, and the pressure of the press forming is 16-19 MPa; the temperature of the autoclave curing is 180-200° C., and the pressure of the autoclave curing is 1.15-1.25 MPa.

Embodiment 3

[0028] An autoclaved brick with vanadium extraction tailings from stone coal as a main raw material and a preparation method thereof. Firstly, 70~75wt% of pretreated vanadium extraction tailings, 10~15wt% of fly ash and 10~15wt% of slaked lime are used as raw materials, and then 12~14wt% of water is added to the raw materials, stirred evenly, and pressed into shape. Rest for 12 hours; then put the rested bricks into the autoclave for autoclaving for 5-8 hours, cool down naturally, and leave the autoclave to obtain autoclaved bricks with vanadium extraction tailings from stone coal as the main raw material.

[0029] In this embodiment: the press forming refers to pressing the adobe into a brick on a pressure forming machine, and the pressure of the press forming is 17-20 MPa; the temperature of the autoclave curing is 180-200° C., and the pressure of the autoclave curing is 1.15-1.25 MPa.

[0030] Compared with the prior art, this specific embodiment has the following economic ...

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Abstract

The invention relates to an autoclaved brick prepared by utilizing stone coal vanadium extraction tailings as a main raw material and a preparation method thereof. The technical scheme comprises the steps of adding water into 50-75wt% of pretreatment vanadium extraction tailings, 10-30wt% of pulverized fuel ash and 10-25wt% of slaked lime as raw materials, wherein the content of water accounts for 12-18wt% of the raw materials, stirring uniformly, pressing to form and standing for 12h; and putting the unburned brick after standing into an autoclave to autoclaved cure for 5-8h, naturally cooling and discharging the brick from the autoclaved so as to obtain an autoclaved brick prepared by utilizing the stone coal vanadium extraction tailings as the main raw material, wherein the pretreatment vanadium extraction tailings is obtained through drying the vanadium extraction tailings until the water content is less than 2wt%, crushing the vanadium extraction tailings until the grain size is less than 3mm and standing for 2 days; the autoclaved curing temperature is 180-200 DEG C, and the autoclaved curing pressure is 1.15-1.25MPa. The method has the characteristics of high waste utilization ratio, high production efficiency and low cost, and the autoclaved brick prepared by utilizing the stone coal vanadium extraction tailings as the main raw material has high strength and excellent durability.

Description

technical field [0001] The invention belongs to the technical field of autoclaved bricks, and in particular relates to an autoclaved brick with vanadium extraction tailings from stone coal as a main raw material and a preparation method thereof. Background technique [0002] In the production process of vanadium pentoxide, a large amount of acid-containing solution is used to treat vanadium ore, so that the pentavalent vanadium in the ore is transferred to the solution. After filtering and washing, the filter residue is neutralized by soda lime, which is the tailings of vanadium extraction from stone coal. . The main mineral phase of vanadium extraction tailings from stone coal is quartz, and there are a small amount of pyrite and calcite. [0003] Because the grade of vanadium in stone coal is relatively low. The production of one ton of vanadium pentoxide generally produces more than 150 tons of tailings. With the development of the stone coal vanadium extraction industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B18/14
CPCY02W30/91
Inventor 张一敏史伟刘涛包申旭黄晶陈铁军
Owner WUHAN UNIV OF TECH
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