Purification of Mine Waters Using Lime and Aluminum Hydroxochloride

Abstract

Analysis of the scientific and technical literature shows that there are quite a few methods of mine water processing. Reagent methods can be considered as the most promising and economically expedient. Mine waters are characterized by a high content of hardness ions and sulfates. The concentration of sulfates varies between 5-35 mg-eq/ dm 3 , hardness -10-40 mg-eq/dm 3 . It has been established that effective purification of water from sulfates can be achieved with the use of lime and 5/6 aluminum hydroxochloride. The efficiency of the process depends on the doses and ratio of reagents. The degree of softening and purification of water from sulfates increases with an increase in the dose of aluminum coagulant within certain limits. When using 5/6 aluminum hydroxochloride, the efficiency of water purification from sulfates is quite high and small amounts of chlorides are introduced into the water with the coagulant.

New Approaches to Comprehensive Electrochemical Processing of Sulfate-Chloride High-Mineralized Wastewater Treatment Residues

“…However, without prior chemical or ion exchange treatment, these membranes quickly lose their permeability due to salt deposition on their surface. Additionally, pretreating the water with aluminium hydroxychloride [3,4] or sodium hydroxyaluminate [5] results in the formation of precipitates that require disposal. While membrane regeneration is an effective solution, it is often prohibitively expensive, leading to the decision to replace the membranes entirely and resulting in a significant increase in the cost of water treatment.…”

Вилучення Сульфатів З Розчину В Процесі Використання Червоного Шламу

“…All this together makes the technology expensive and more energyconsuming, unlike liming when using red mud. When using 5/6 AHC and liming of water for purification of mineralized waters with an initial concentration of sulfates of 16 mg-eq/dm 3 , it was shown that the degree of purification reaches 65 % [47]. It was shown that the degree of purification reaches 75 %, when using red sludge and liming of water for purification of mineralized waters with an initial concentration of sulfates of 20 mg-eq/dm 3 .…”

Optimization of mine water discharge with the river hydrograph. Case study Samara River in Western Donbas

“…To mitigate the negative impact of mine water discharge, various purification methods and water treatment schemes are used, including bio-purification, ion exchange, coagulation, disinfection, oxidation, settling, sorption, filtration, and flotation [3]. Despite hundreds of combinations of these methods being proposed, only a small number of them are considered to be efficient for industrial use 2 [4,5]. This is because some treatment technologies (biochemical and coagulation) do not meet modern requirements for treatment quality and produce significant amounts of sediments, which require large areas for storage and disposal.…”