Abstract
The study reported was intended to improve the leaching rate of boron-bearing tailings, using a method of sodium roasting that uses boron-bearing tailings as the raw material and Na2CO3 as the sodium agent. The effects of the roasting temperature and Na2CO3 amount on the leaching rate of boron-bearing tailings are mainly evaluated. The morphology and composition of the samples after sodium roasting are analysed by scanning electron microscopy and X-ray diffraction. The results show that sodium roasting can significantly improve the leaching rate of boron-bearing tailings. Under the optimal conditions where roasting temperature is 950°C, Na2CO3 amount is five times the theoretical amount and roasting time is 2 h, the leaching rate of boron-bearing tailings is up to 86.78%. Based on the analysis of the characterization results and the mechanism analysis of the sodium roasting process, the main reason for the increase of leaching rate is the reaction between Na2O produced by the decomposition of Na2CO3 and the boron in boron-bearing tailings resulting in soluble sodium borate. The results provide a scientific basis for the efficient comprehensive use of boron-bearing tailings.
Highlights
As an important ore resource, boron deposit is the basic raw material for the production of borax [1,2], boric acid [3,4] and a series of other boron and boride products [5,6], which are widely used in fields such as chemicals, metallurgy, building materials, electrical appliances, machinery, agriculture, nuclear industry and& 2018 The Authors
Our previous paper [24] mainly studied the influence of sodium roasting on boron recovery, while this paper mainly focuses on the influence of sodium roasting on the leaching rate of boron
The purpose of the paper is to investigate the effects of roasting temperature, Na2CO3 amount and roasting time on the leaching rate of boron-bearing tailings in the process of sodium roasting
Summary
As an important ore resource, boron deposit is the basic raw material for the production of borax [1,2], boric acid [3,4] and a series of other boron and boride products [5,6], which are widely used in fields such as chemicals, metallurgy, building materials, electrical appliances, machinery, agriculture, nuclear industry and& 2018 The Authors. The vast majority of boron ore processing methods use ascharite as the raw material to produce borax and boric acid which are used as basic inorganic chemical raw materials and can be further processed into other boron compounds [14,15]. As a result of boron removal in paigeite, the paigeite in the Kuandian area, Dandong, Liaoning produces a large amount of boron-bearing tailings with a leaching rate of only 45–55%. Because of their low leaching rate, boron-bearing tailings cannot be used as raw materials for borax preparation and are difficult to be processed and used. It is necessary and urgent to carry out research on the improvement of the leaching rate of boron-bearing tailings
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