Sustainable application of sodium removal from red mud: Cleaner production of silicon-potassium compound fertilizer

Chao, Xi; Zhang, Ting‐an; Lv, Guozhi; Liang, Zhipeng; Chen, Yang

doi:10.1016/j.jclepro.2022.131601

Cited by 26 publications

(5 citation statements)

References 35 publications

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“…After continuous application, macro-aggregates were gradually formed, and the application of attapulgite soil promoted the growth of maize, and the increase in root exudates also contributed to the formation of organic carbon. Chao showed that the leaching loss of nitrogen was reduced, and nitrogen content increased after the application of mineral clay [55]. The results of this study also show that the application of attapulgite increases the organic carbon in the aggregates and the total nitrogen content in the aggregates.…”

Section: Effect Of Attapulgite Soil Application On Carbon and Nitroge...supporting

confidence: 59%

Effect of Attapulgite Application on Aggregate Formation and Carbon and Nitrogen Content in Sandy Soil

Niu,

Su,

et al. 2023

Sustainability

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Clay minerals are the main cementing substances for sandy soils to form aggregates. The clay mineral attapulgite clay is abundant in Northwest China, and its special colloidal properties and crystal structure make it excellent in improving soil physicochemical properties. Using attapulgite as soil conditioner, the effects of different application rates of attapulgite on the formation and stability of sandy soil aggregates were studied through field experiments for two consecutive years. The results showed that the application of 6000 kg·hm−2 attapulgite soil in sandy soil farmland for two consecutive years reduced the soil bulk density by 0–20 cm, from 1.55 g·cm−3 to 1.47 g·cm−3, a decrease of 3.6%; the soil pH was increased by 3.7% from 8.59 to 8.84. The soil organic carbon, inorganic carbon and total nitrogen in the whole soil increased by 4.52%, 5.23% and 6.22%, respectively. The mass fraction of macro-aggregates of 2–0.25 mm and micro-aggregates of 0.25–0.053 mm as well as the contents of organic carbon, inorganic carbon and total nitrogen increased by 3.5%, 5.2%, 8.7%, 5.6% and 6.7%, respectively, thus improving the stability of aggregates. However, low application rates (1500 kg·hm−2 and 3000 kg·hm−2) of attapulgite had no significant effect on soil physical and chemical properties. Attapulgite, as a kind of highly adsorptive clay mineral, can be directly applied to sandy soil to increase soil cementitious substances, promote the formation of soil aggregates and increase the carbon and nitrogen fixation capacity of sandy soil. The improvement effect on the formation and stability of aggregates will gradually accumulate with the years of application. Therefore, in the future, the effects of adding attapulgite on the growth of various crops under various types of soil and climatic conditions should be carried out to obtain more systematic conclusions.

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Section: Effect Of Attapulgite Soil Application On Carbon and Nitroge...supporting

confidence: 59%

Effect of Attapulgite Application on Aggregate Formation and Carbon and Nitrogen Content in Sandy Soil

Niu,

Su,

et al. 2023

Sustainability

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“…The substrate material, square hole area and dropping volume were optimized in this study. (6) The substrate was dried for 10 min using a heater at 40 • C. At this point, samples were finished.…”

Section: Methodsmentioning

confidence: 99%

“…However, the amount of available K is very small, with only 0.1-2% of the total K in soil [5]. In order to upgrade the yield and quality of crops, a large amount of K fertilizer is required [6]. This has inevitably caused atmospheric and water pollution [7] and a soil nutrient distribution imbalance [8].…”

Section: Introductionmentioning

confidence: 99%

Chitosan Homogenizing Coffee Ring Effect for Soil Available Potassium Determination Using Laser-Induced Breakdown Spectroscopy

Chen

You

et al. 2022

Chemosensors

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In order to rationally apply potassium fertilizer, it is very important to realize the rapid and accurate evaluation of soil available potassium (K). Conventional methods are time-consuming, consumables-consuming and laborious. A high-efficiency method was proposed in this study to meet the demand for rapid evaluation, including rapid extraction, uniform evaporation and LIBS detection. To shorten the extraction time, we increased the oscillation frequency and removed the operation of dry filtration. Compared with the conventional extraction method of the Chinese national standard (CNS), the extraction time was reduced from 30 min to 2 min. In addition, we developed a uniform evaporation method for liquid–solid transformation on the batch-detection fixed area aluminum substrate. This method reduced the moisture interference. At the same time, increasing the liquid viscosity and restricting the liquid area and shape could reduce the coffee ring effect (CRE). The determination coefficient of the calibration curve by our method was 0.99, and the limit of quantitation reached 0.8 mg/kg. Real soil samples were taken as validation, and the average relative error between our method and the CNS method was 3.58%. The results indicate that our method combined with LIBS technology could provide a fast and accurate evaluation of soil available K.

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“…The first direction involves the bulk utilization of waste, with the goal of reducing the RM stock of enterprises. Related research and development efforts in this area include the reuse of RM for making geopolymer, flocculant and environmental remediation material ( Cho et al, 2019 ; Chao et al, 2022 ). The second direction focuses on the rich metal elements in RM, particularly trace elements such as Ti, Sr, and Zr.…”

Section: Introductionmentioning

confidence: 99%

Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route

Liu²,

et al. 2023

Front. Chem.

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Red mud (RM) a solid waste generated by the bauxite smelting industry, is a rich source of metal resources, especially Ti, and its recycling can bring significant environmental and economic benefits. In this study, precious metal Ti was efficiently recovered from red mud using a coupled acid leaching and boiling route for the effective separation of low-value metals. The red mud which contained mainly 10.69% Si, 12.1% Al, 15.2% Ca, 10.99% Fe, and 4.37% Ti, was recovered in five steps. First, a nitric acid solution was used to leach the metals in multiple stages, resulting in an acidic leach solution with high concentrations of Fe, Al, Ti, and Ca ions 2.7 g/L, 4.7 g/L, 5.43 g/L, and 1.8 g/L, respectively. Then, a small amount of sucrose was added as a catalyst to recover Ti from the leach solution under hydrothermal conditions, resulting in the targeted recovery of 98.6% of Ti in the form of high-purity anatase while Fe, Al, and Ca remained in the solution. Next, the Fe in solution was separated as hematite products at a temperature of 110°C and a reaction time of 4 h. Similarly, the Al in the solution was separated and precipitated as boehmite by heating it at 260°C for a reaction time of 20 h. Finally, the remaining Ca in solution was recovered by simple pH regulation. Economic accounting assessment showed that the method yields $101.06 for 1 t of red mud treated, excluding labor costs. This study provides a novel approach to recover precious metals from metal wastes through the whole process resource recovery of solid waste red mud.

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Sustainable application of sodium removal from red mud: Cleaner production of silicon-potassium compound fertilizer

Cited by 26 publications

References 35 publications

Effect of Attapulgite Application on Aggregate Formation and Carbon and Nitrogen Content in Sandy Soil

Effect of Attapulgite Application on Aggregate Formation and Carbon and Nitrogen Content in Sandy Soil

Chitosan Homogenizing Coffee Ring Effect for Soil Available Potassium Determination Using Laser-Induced Breakdown Spectroscopy

Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route

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