A kind of tungsten tailings cementitious material and preparation method thereof

A technology for cementitious materials and tungsten tailings, applied in the field of building materials, can solve problems such as harming human health, polluting the environment, occupying land, etc., achieving the effects of low cost, high resource utilization rate, and improved compressive strength

Active Publication Date: 2021-08-10
湖南清大中祁环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, tungsten tailings are mainly stored in tailings ponds or backfilled like mines, which cause waste of resources, occupy land, pollute the environment, and endanger human health.

Method used

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  • A kind of tungsten tailings cementitious material and preparation method thereof
  • A kind of tungsten tailings cementitious material and preparation method thereof
  • A kind of tungsten tailings cementitious material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A cementitious material for tungsten tailings, the mass ratio of which is as follows: 50kg of tungsten tailings, 10kg of hemihydrate gypsum, 25kg of S95 grade slag, 8kg of steel slag with a particle size of ≤75μm, 5kg of activator, 2kg of polycarboxylate superplasticizer, The mass ratio of the activator is Portland cement 2kg, sulphoaluminate cement 3kg. The preparation method of the tungsten tailings cementitious material comprises the following steps: (1) using zirconia ceramic balls to grind the tungsten tailings for 8 hours and drying them to obtain tungsten tailings powder; (2) mixing the tungsten tailings powder and slag , steel slag, activator, and polycarboxylate superplasticizer are poured into a ball mill, and ordinary ceramic balls are used for ball milling for 2 hours to obtain the tungsten tailings cementitious material.

Embodiment 2

[0027] A cementitious material for tungsten tailings, the mass ratio of which is as follows: 58kg of tungsten tailings, 5kg of hemihydrate gypsum, 30kg of S95 grade slag, 1.5kg of steel slag with a particle size of ≤75μm, 4kg of activator, and 1.5kg of polycarboxylate superplasticizer kg, the mass ratio of the activator is Portland cement 3.2kg, sulphoaluminate cement 0.8kg. The preparation method of the tungsten tailings cementitious material comprises the following steps: (1) using zirconia ceramic balls to grind the tungsten tailings for 12 hours and drying them to obtain tungsten tailings powder; (2) mixing the tungsten tailings powder and slag , steel slag, activator, and polycarboxylate superplasticizer are poured into a ball mill, and ordinary ceramic balls are used for ball milling for 0.5 h to obtain the tungsten tailings cementitious material.

Embodiment 3

[0029] A tungsten tailings cementitious material, the mass ratio of which is as follows: tungsten tailings 65kg, hemihydrate gypsum 8kg, S95 grade slag 18kg, steel slag with particle size ≤75μm 6.2kg, activator 2kg, polycarboxylate superplasticizer 0.8 kg, the mass ratio of the activator is Portland cement 1.2kg, sulphoaluminate cement 0.8kg. The preparation method of the tungsten tailings cementitious material comprises the following steps: (1) using zirconia ceramic balls to grind the tungsten tailings for 16 hours and drying them to obtain tungsten tailings powder; (2) mixing the tungsten tailings powder and slag , steel slag, activator, and polycarboxylate superplasticizer are poured into a ball mill, and ordinary ceramic balls are used for ball milling for 1 hour to obtain the tungsten tailings cementitious material.

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Abstract

The invention relates to the field of building materials, in particular to a tungsten tailings cementitious material and a preparation method thereof. A tungsten tailings cementitious material, characterized in that its mass ratio is as follows: tungsten tailings 50%-70%, hemihydrate gypsum 5%-15%, slag 10%-30%, steel slag 1%-8% , activator 1%‑5%, water reducer 0.1%‑2%. The mass ratio of the activator is 40%-80% of Portland cement and 20%-60% of sulphoaluminate cement. The preparation method of the tungsten tailings cementitious material comprises: (1) ball milling and drying the tungsten tailings to obtain tungsten tailings powder; The water is poured into a ball mill for ball milling to obtain a mixture; (3) curing at normal temperature. The cementitious material of the present invention uses tungsten tailings as the main raw material, which can alleviate the problem of accumulation of tungsten tailings and enable high-value utilization of secondary resources of tungsten tailings.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a tungsten tailings cementitious material and a preparation method thereof. Background technique [0002] Tungsten tailings is a solid material formed after fine-grained tailings slurry dehydration is discharged after tungsten ore is ground and finely selected for its tungsten-containing minerals. It is generally composed of ore minerals and surrounding rock minerals, mainly containing fluorite, quartz, and pomegranate. Minerals such as stone, often, mica, calcite, etc., some contain a small amount of polymetallic minerals such as molybdenum, bismuth, etc., the main chemical composition is: SiO 2 、Al 2 o 3 , CaO, CaF 2 , MgO, Fe 2 o 3 Wait. Tungsten tailings have stable chemical properties and poor reactivity. High hardness, lighter color, and finer particles have greater advantages in some applications that require finer particle size; some tungsten tailings contain heav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/21C04B7/19C04B7/17C04B7/36
CPCC04B7/17C04B7/19C04B7/21C04B7/243C04B7/36Y02P40/10
Inventor 李伟雄贺新民张宏生
Owner 湖南清大中祁环保科技有限公司
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