Resource utilization of strongly acidic wastewater and red gypsum by a harmless self-treatment process

Ju, Jinrong; Feng, Yu; Li, Haoran

doi:10.1016/j.psep.2023.02.067

Cited by 7 publications

(4 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, considering the energy consumption and cost, a more efficient additive selection or adjustment to produce higher value and purer calcium carbonate will be a future development trend. Although the pH swing process for leaching by-product gypsum improves leaching efficiency and removes impurities [15], it has obvious disadvantages. First, the process is complex and requires large amounts of acids and alkalis.…”

Section: Ph Swingmentioning

confidence: 99%

“…Three significant industrial gypsum by-products are flue-gas desulfurization gypsum (FGDG) [13], which is produced from coal combustion after the wet desulfurization of flue gas; phosphogypsum (PG) [14], which originates from phosphate fertilizer production; and red gypsum (RG) [15], a by-product of the neutralization of spent sulfuric acid in titanium dioxide production. In 2020, China produced approximately 200 Mt of industrial gypsum by-products, 90% of which was FGDG, phosphogypsum, and titanium gypsum [16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

Wang

et al. 2023

Sustainability

View full text Add to dashboard Cite

To avoid the long-term pollution of land and water by industrial gypsum by-products, the exploitation of this resource has become a priority. The indirect synthesis of calcium carbonate from the industrial by-product gypsum has received substantial attention as a viable method for resource utilization. Currently, the primary problems in the indirect manufacture of calcium carbonate from the industrial by-product gypsum are additive recycling and process simplification. This paper describes the present state of development and compares various indirect mineralization systems. The factors affecting leaching and mineralization in the indirect mineralization of CO2 from by-product gypsum and the management of CaCO3 crystallinity are discussed, and the current additive regeneration cycle is summarized. The applications of other technologies in the indirect mineralization of by-product gypsum are also summarized, as are the obstacles, and required future work. This review provides guidelines for the laboratory indirect mineralization of by-product gypsum as well as practical applications.

show abstract

Section: Ph Swingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

Wang

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…Approximately 3.364 million tons of titanium dioxide pigments were produced by using the sulfate process in China in 2022, resulting in about 27 million tons of 20% waste sulfuric acid, which would cause great harm to the environment. In recent years, a series of studies had been conducted on valuable metal extraction, harmless resource utilization, recovery of titanium and sulfuric acid, and pressure leaching of titanium concentrate, − providing useful references for the comprehensive utilization of TiO 2 pigment waste acid.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach for Comprehensive Utilization by Leaching Pyrite Cinder with Titanium Dioxide Waste Acid by Response Surface Methodology

Tian

2024

ACS Omega

View full text Add to dashboard Cite

Comprehensive utilization of two industrial wastes by leaching pyrite cinder with titanium dioxide waste acid was proposed by using response surface methodology of the Box− Behnken design method. The effects of leaching conditions such as leaching temperature, leaching time, and waste acid/pyrite cinder ratio on the leaching yield were examined. The prediction model including the leaching variables with a good fitting result was established to predict the leaching yield or optimize the leaching variable values. The regression equation model was significant and reliable with an actual correlation coefficient R 2 of 0.9856. The leaching conditions greatly affected the leaching rate, reaction equilibrium, solubility of the acid decomposed substances, and the common ion effects, influenced the leaching process, and finally improved the leaching yield. The variables such as leaching temperature and waste acid/pyrite cinder ratio had the greatest collaborative interactions, and the effects of the waste acid/pyrite cinder ratio were larger than the other two. The verification experiments confirmed that the leaching yield values could be achieved at 82.68 % under the optimal conditions.

show abstract

“…EC has the advantages of high processing efficiency, flexibility and easy control, but the electrode material is easy to wear and tear, and needs to be replaced periodically, which increases the maintenance cost [28]. Therefore, there is an urgent need for a more economical, effective and environmentally friendly process technology for the resource treatment of calcium and magnesium ions in external drainage water [29].…”

Section: Introductionmentioning

confidence: 99%

Research on Carbon Dioxide-Assisted Electrocoagulation Technology for Treatment of Divalent Cations in Water

Chang,

Li,

Guo

et al. 2024

Water

View full text Add to dashboard Cite

In the external drainage water of Xinjiang Karamay Petrochemical Company, the calcium and magnesium ion contents are as high as 630 mg/L and 1170 mg/L, respectively. These ions are subsequently scaled at large quantities in water treatment equipment, which greatly reduces the efficiency of the process. This study used a coupled chemical precipitation (CP) and electrocoagulation (EC) method to deal with external drainage water. The results show that the removal rates of calcium and magnesium were 94.71% and 96.33%, respectively, when the pH was adjusted with sodium silicate and EC was introduced after saturating the water samples with CO2. In this study, a quadratic polynomial equation was developed for predicting the removal of calcium and magnesium ions using this coupled technique under three factors of current density (CD) (15, 20 and 25 mA/cm2), reaction time (RT) (30, 40 and 50 min) and pH (10.0, 10.5 and 11.0). It was found that these three variables have a significant effect on the removal of both the abovementioned ions. The response surface method based on a Box–Behnken design showed that the average removal rates of calcium and magnesium ions could be 96.57% and 98.66% at a CD of 22 mA/cm2, RT of 46 min and pH of 11. This study confirmed the presence of calcium carbonate in the solid product through XRD and SEM analysis. The results indicate that this study is promising, and the developed technique can also be used to remove the high concentrations of calcium and magnesium ions from different wastewaters.

show abstract

Resource utilization of strongly acidic wastewater and red gypsum by a harmless self-treatment process

Cited by 7 publications

References 41 publications

Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

A Novel Approach for Comprehensive Utilization by Leaching Pyrite Cinder with Titanium Dioxide Waste Acid by Response Surface Methodology

Research on Carbon Dioxide-Assisted Electrocoagulation Technology for Treatment of Divalent Cations in Water

Contact Info

Product

Resources

About