Abstract
Coal gasification is a new direction for the clean utilization of coal, but it also brings huge environmental pressure on solid waste. In this paper, the high-crystallinity single-phase zeolite A was prepared by solid-phase alkali fusion synthesis from coal gasification fine slag (CGFS), without template agent, with low water consumption, and with low cost, and it was used to remove heavy metals such as Pb2+ and Cu2+ in simulated waste water. The main factors affecting the solid-phase and green synthesis methods were analyzed, and the optimum conditions for solid-phase synthesis of high-crystallinity single-phase zeolite A were determined as follows: NaOH/CGFS = 1.2; solid-phase alkali fusion temperature 823 K, solid-phase alkali fusion 90 min, liquid–solid ratio 4.5, and 353 K hydrothermal reaction for 12 h. The relative crystallinity, specific surface area, and ion-exchange capacity of single-phase zeolites A are 93.1%, 61.09 m2/g, and 268.4 mmol/100 g. The removal rates of Pb2+ and Cu2+ can reach more than 99%, especially for the removal efficiency of Pb2+, which is common in simulated waste water. This is an effective method with important application prospects, and it formed an effective way to recycle solid waste of coal chemical industry.
Highlights
Ningdong Coal and Chemical Base in China has the largest single capacity coal gasification plant in the world
This study provides a new idea for solving the large-scale accumulation of coal gasification fine slag (CGFS) and the treatment of ammonia nitrogen and heavy metals, especially Pb2+ and Cu2+, in industrial-simulated waste water
The X-ray diffraction (XRD) pattern of the coal gasification fine slag (Figure 2) shows that the main diffraction peak appears as quartz, and the “tap peak” indicates that most of the coal gasification fine slag exists in a glassy form
Summary
Ningdong Coal and Chemical Base in China has the largest single capacity coal gasification plant in the world. With the continuous increase of its production capacity and great environmental pressure, the annual output of Coal gasification slag is close to 10 million tons, of which fine slag accounts for about 50%. Coal Gasified slag has a chemical composition similar to that of zeolites, and if it can be converted at a low cost, it will have great economic and environmental benefits. Coal gasification fine slag can be used in the fields of adsorption of heavy metal pollution, sewage treatment, catalysis, and so on. It can reduce environmental pollution and realize the resource utilization of waste and the realization of “Using waste treat waste” [5,6]
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