Fluorgypsum-based cementing materials for filling tailings and preparation method thereof

A technology of tailings filling and fluorogypsum, which is applied in the direction of cement production, etc., can solve the problems of restricting the use and development of filling technology, the high cost of tailings filling, and the low strength of consolidated bodies, achieving low cost and weathering resistance Good, good filling performance

Inactive Publication Date: 2012-08-15
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the traditional tailings consolidation and filling technology, cement is generally used as the cementitious material to consolidate the tailings. The unit consumption of cement is very large, resulting in tailings filling The high cost has caused gre

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0048] 1. Production of cementitious materials: Step 1: first adjust the pH of the fluorogypsum to make it weakly alkaline; Step 2: weigh 25% of modified fluorogypsum, 13% of cement clinker, 15% steel slag, 47% slag; grind the weighed modified fluorogypsum with a ball mill until the specific surface area is 805.7 m 2 / kg, then mixed with powdered slag, steel slag, cement clinker and mixed uniformly to obtain base material; Step 3: take 98% base material and 2% sulfate activator according to mass percentage, and mix uniformly, That is, the fluorogypsum-based cementitious material for tailings filling is prepared.

[0049] 2. Tailings consolidation experiment. Add the cementitious material prepared above to the tailings according to the lime-sand ratio of 1 / 8, pour into the mortar mixer and mix evenly, add water at a concentration of 70%, stir for 3 minutes, pour the stirred material into the selected test mold (70.7mm ×70.7mm×70.7mm), let stand for a period of time, c...

Embodiment 2

[0053] 1. Production of cementitious materials: Step 1: Prepare modified fluorogypsum for later use; Step 2: Take 25% modified fluorogypsum, 5% cement clinker, 25% steel slag, 45 % of slag; the weighed modified fluorogypsum was ground with a ball mill until the specific surface area was 832.1 m 2 / kg, then mixed with powdered slag, steel slag, cement clinker and mixed uniformly to obtain base material; Step 3: take 99% base material and 1% sulfate activator according to mass percentage, and mix uniformly, That is, the fluorogypsum-based cementitious material for tailings filling is prepared.

[0054] 2. Tailings consolidation experiment: configure cementitious material according to the above ratio, then add tailings according to the ratio of lime to sand 1 / 8, pour into the cement sand mixer and mix evenly, add water according to the concentration of 70%, stir for 3 minutes, and mix the mixed material Pour it into the selected test mold (70.7mm×70.7mm×70.7mm), let it stan...

Embodiment 3

[0058] 1. Production of cementitious materials: Step 1: Prepare modified fluorogypsum for later use; Step 2: Take 38% modified fluorogypsum, 10% cement clinker, 15% steel slag, 37 % of slag; the weighed modified fluorogypsum was ground with a ball mill until the specific surface area was 829.3 m 2 / kg, then mixed with powdered slag, steel slag, cement clinker and mixed uniformly to obtain base material; Step 3: take 97% base material and 3% sulfate activator according to mass percentage, and mix Uniform, that is, the fluorogypsum-based cementitious material for tailings filling is obtained.

[0059] 2. Tailings consolidation experiment: configure cementitious material according to the above ratio, then add tailings according to the ratio of lime to sand 1 / 8, pour into the cement sand mixer and mix evenly, add water according to the concentration of 70%, stir for 3 minutes, and mix the mixed material Pour it into the selected test mold (70.7mm×70.7mm×70.7mm), let it stan...

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Abstract

The invention relates to fluorgypsum-based cementing materials for filling tailings. A preparation method comprises the following steps of: grinding modified fluorgypsum, steel slags, mineral slags and cement clinker, uniformly mixing according to a certain mass percent, and adding a proportion of sulfate activator to obtain the cementing materials for filling the tailings. The modified fluorgypsum is in alkalescence through adjusting PH of the fluorgypsum. The cementing materials are utilized for filling the tailings, so that the sources of raw materials are wide, the process preparation is simple, the construction is convenient, and the filling cost is low; and in addition, various industrial waste slags in metallurgy industry are effectively utilized, so that the materials play a role in energy conservation, emission reduction and environment protection.

Description

technical field [0001] The patent of the invention relates to a building material, in particular to a fluorogypsum-based cementitious material for tailings filling and a preparation method thereof. [0002] Background technique [0003] Fluorogypsum is the waste residue of hydrofluoric acid produced from fluorite and concentrated sulfuric acid in fluoride salt plants. For every 1 ton of hydrofluoric acid produced, about 3.6 tons of fluorogypsum are produced. Fluorogypsum has disadvantages such as insoluble in water, slow hydration, poor coagulation ability, and low early strength. Has not been well applied. At present, except that some fluorine gypsum is used as a cement settling agent, most of them are piled up as a solid waste after a little neutralization treatment. It not only occupies land, but also pollutes the soil and groundwater environment. In 2010, my country's annual output of hydrogen fluoride reached 830,000 tons, and the output of gypsum was as high as 2.8...

Claims

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Application Information

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IPC IPC(8): C04B7/21
CPCY02P40/10
Inventor 周旻侯浩波黄绪泉汪韦兴荣浩
Owner WUHAN UNIV
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