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Coal gangue for gel

The experimental study of the coal gangue as gel filling

The odd axes resist pressure intensity with large quantity coal gangue was discussed and experimented on fly ash and coal gangue gel filling body between different concentration, proportion and

The experimental study of the coal gangue as gel filling

Jul 13, 2008 The odd axes resist pressure intensity with large quantity coal gangue was discussed and experimented on fly ash and coal gangue gel filling body between different concentration, proportion and additive dosage.

Study of Synthesis of SiO2 Aerogel from Coal Gangue at an

The hydrophobic SiO2 aerogel was prepared by using coal gangue as the starting material—which is viewed as waste in most coal mining and preparation plant—via ambient pressure drying through sol-gel method. The effects of different temperature, time to keep the temperature,vary in mass ratio of coal gangue to sodium hydroxide on the leaching ratio of SiO2 from coal refuses are discussed in

Study of Synthesis of SiO 2 Aerogel from Coal Gangue at an

Coal gangue, one of the main hazardous emissions of purifying coal from coalmine industry, is rich in silica and alumina. However, the recycling of the waste is normally restricted by less

(PDF) Facile preparation of SiO2-Al2O3 aerogel using coal

a) Schematic diagram of the preparation of SiO 2 –Al 2 O 3 aerogel using coal gangue as the raw material, (b) pictures of the Tyndall phenomenon of silica–alumina (Si–Al) sol by comparing

Improving strength of calcinated coal gangue geopolymer

Mar 30, 2018 When the geopolymer was prepared by low calcium raw materials, for example: low calcium fly ash, coal gangue, etc, the increase of active calcium content in geopolymer was helpful for the generation of C-S-H and C-A-S-H gel and improved the internal structure of geopolymer as well as obviously enhanced its compressive strength.

The experimental study of the coal gangue as gel filling

The odd axes resist pressure intensity with large quantity coal gangue was discussed and experimented on fly ash and coal gangue gel filling body between different concentration, proportion and

Study on Properties of Coal Gangue Derived SiO Aerogel and

Study on Properties of Coal Gangue Derived SiO2 Aerogel and Composite Mortar Shuqi Yu * and Pinghua Zhu Department of Environmental and Safety Engineering, Changzhou University, Changzhou, China *Corresponding author Abstract—In the paper, a kind of SiO2 aerogel based on coal gangue was synthesized and its physical properties were investigated.

Facile preparation of a SiO 2 –Al 2 O 3 aerogel using coal

2.2 Methods The specific preparation procedure of the SiO 2 –Al 2 O 3 aerogel is shown in Fig. 1(a).Firstly, gangue samples and Na 2 CO 3 were prepared by screening the ground raw materials to a mesh of 100. Then, coal gangue was mixed with Na 2 CO 3 at different weight ratios and calcined at a certain temperature (870–930 °C). Subsequently, the sinter was blended with excess HCl solution

Study of Synthesis of SiO 2 Aerogel from Coal Gangue at an

Coal gangue, one of the main hazardous emissions of purifying coal from coalmine industry, is rich in silica and alumina. However, the recycling of the waste is normally restricted by less

Study of Synthesis of SiO2 Aerogel from Coal Gangue at an

Abstract: The hydrophobic SiO 2 aerogel was prepared by using coal gangue as the starting material—which is viewed as waste in most coal mining and preparation plant—via ambient pressure drying through sol-gel method.

Performance of Coal Gangue-Based Cemented Backfill

Coal gangue-based cemented backfill material (CGCBM) is developed for backfilling the goaf in coal mines. As fresh CGCBM slurry is generally transported into underground openings through a pipeline, and after hardening, it plays the role of supporting the overlying strata.

China Coal Gangue, Coal Gangue Manufacturers, Suppliers

China Coal Gangue manufacturers Select 2021 high quality Coal Gangue products in best price from certified Chinese Block Making Machine, Block Machine suppliers, wholesalers and factory on Made-in

What is Coal Gangue sandmakingmachinelz

What is Coal Gangue ? 2017-01-06. Brief introduction; It is a solid waste in the process of coal mining and clean coal production. It has been used in power generation, cement production, brick making, chemical products production, soil improvement, etc.

Coal gangue processing Dewo Machinery

The large coal gangue silo is uniformly fed by the vibrating feeder to the jaw crusher for coarse crushing.The coarsely crushed coal gangue is conveyed by a belt conveyor to a impact crusher or a cone crusher for fine crushing. The second stage: medium and fine crushing

Gangue

Banded Zn-Pb ore sample with sphalerite (brown) and galena as main ore minerals and calcite as main gangue mineral (old Bad Grund mine, Germany) In mining, gangue (/ ɡæŋ /) is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit.

Synthesis and characterization of geopolymers derived from

May 10, 2019 Coal gangue (CG) was obtained from Hebei, China and fly ash (FA) was collected from Zhangjiakou Power Plant, Hebei, China. Red mud (RM) was sourced from Zibo, Shangdong, China. All the raw materials were oven dried before use and their chemical compositions are presented in Table 1.

Materials Free Full-Text Preparation and Reaction

Geng et al. [ 22] used red mud and coal gangue as raw materials to prepare binary geopolymers, the results show that the final product is composed of amorphous silica–aluminum base polymer gel and some impurity filler, which can be used as a new building material.

Rapid synthesis and NH 3 -SCR activity of SSZ-13 zeolite

Aug 22, 2019 The silica–alumina atomic ratio of the coal gangue was approximately 1.21. Compared with the silica–alumina ratio of the gel (15), coal gangue was mainly used as the aluminum source. The Al NMR results of the coal gangue are shown in Fig. 6c. It indicated that Al in the coal gangue consisted of octahedral aluminum and tetrahedral aluminum.

Preparation and Reaction Mechanism Characterization of

Ca 2+ in the slag promotes exchange with Na +, and the product is converted from N-A-S-H gel to C-(A)-S-H gel, and C-(A)-S-H is formed with higher Ca/Si ratio with the increase of slag content. The slight replacement of coal gangue by slag can greatly improve the reaction process and the strength of AACGS materials.

Study on Properties of Coal Gangue Derived SiO Aerogel and

Study on Properties of Coal Gangue Derived SiO2 Aerogel and Composite Mortar Shuqi Yu * and Pinghua Zhu Department of Environmental and Safety Engineering, Changzhou University, Changzhou, China *Corresponding author Abstract—In the paper, a kind of SiO2 aerogel based on coal gangue was synthesized and its physical properties were investigated.

China Coal Gangue, Coal Gangue Manufacturers, Suppliers

China Coal Gangue manufacturers Select 2021 high quality Coal Gangue products in best price from certified Chinese Block Making Machine, Block Machine suppliers, wholesalers and factory on Made-in

Coal gangue processing Dewo Machinery

The large coal gangue silo is uniformly fed by the vibrating feeder to the jaw crusher for coarse crushing.The coarsely crushed coal gangue is conveyed by a belt conveyor to a impact crusher or a cone crusher for fine crushing. The second stage: medium and fine crushing

Effect of Activated Coal Gangue in North China on the

Apr 04, 2019 The active SiO 2 and Al 2 O 3 in the thermal-activated coal gangue are able to react with the Ca (OH) 2, which was produced by cement hydration, and form hydrated calcium silicate and hydrated calcium aluminate gel to enhance the compressive strength of cement.

Coal gangue Electro Magnetic Industries

Equipment needed. No matter the gangue used for brick production, coal and pyrite recycling, or making cement additive and supplying to coal gangue power plant, the normal used processing equipments are jaw crusher, impact crusher, SCM Ultra fine grinding mill, overpressure trapezium mill, MTW European type Trapezoid mill, vibrating screen, vibrating feeder and so on.

Efficient Extraction of SiO2 and Al2O3 from Coal Gangue by

Coal gangue is mainly composed of SiO 2, Al 2 O 3 and other components. It is a huge reserve of aluminum and silicon resources. The coal gangue stockpiles in China is more than 5 billion tons at present, of which contain Al 2 O 3 more than 1 billion tons, SiO 2 more than 2.5 billion tons.

Synthesis and properties of polyacrylamide/hollow coal

May 16, 2013 Polyacrylamide/hollow coal gangue spheres (PAM/HCGS) superabsorbent composites were prepared by in situ aqueous solution polymerization using N,N′‐methylenebisacrylamide (MBA) as a crosslinker and ammonium persulfate (APS) as an initiator.

PAPER OPEN ACCESS Effects and mechanisms of slag

Apr 04, 2020 20% coal gangue into red mud to prepare high-strength red mud-coal gangue geopolymers but did not determine its optimal application parameters. Zhang [12] mixed 30% coal gangue into cement and found that the main hydration products of burned coal gangue-cement were C-S-H, C-A-H, CH, and AFM. Zhang . et al.

Trace Elements in Coal Gangue: A Review IntechOpen

Dec 20, 2017 Coal gangue is one of the largest industrial residues. It has high ash content, low carbonaceous content, and heating value. Meanwhile, it has some trace elements. Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land. Now, coal gangue utilization is a matter of great concern

An Improved Composite Fly Ash Gel to Extinguish

Jun 29, 2020 Fire extinguishing with the superior performance of fly ash composite colloid material is a cost-effective colloid fire prevention technology. In this paper, a new powder additive (suspending agent (XK-XJ) and gelling agent) was developed for the existing fire extinguishing technology of fly ash compound colloid. Tests show that the best additions to the fly ash slurry were 0.3% and 0.1

Experimental Study on Chloride Ion Penetration Resistance

The active Al 2 O 3, SiO 2 on the surface of coal gangue react with Ca (OH) 2 in cement slurry, and the C-S-H gel and Ca (OH) 2 are carefully adhered together to make the overall structure of the system more dense and resistant to chloride ion permeability. 5.

1. Introduction

In this work, waste coal gangue was used as the rich silicon raw material for the preparation of silica aerogel by using a “3-step extraction” route to extract and purify SiO 2 from coal gangue, adjusting SiO 2 concentration, promoting sol-gel transition, and following single-step solvent exchange/hydrophobization/ambient drying; over 96%

A novel environmental route to ambient pressure dried

Jan 01, 2016 Zhu et al. reported the synthesis of silica xerogels from coal gangue by ambient drying of trimethylchlorosilane modified gels; the 88.97% porosity and 0.256 g/ [cm.sup.3] density were achieved, but there is no report on the extraction yield and thermal performance of the xerogels.

coal gangue brick, coal gangue brick Suppliers and

5,536 coal gangue brick products are offered for sale by suppliers on Alibaba, of which brick making machinery accounts for 68%, bricks accounts for 1%. A wide variety of coal gangue brick options are available to you, such as acid resistance bricks, firebricks. You can also choose from modern, traditional, and contemporary coal gangue