This investigation examines the experimental data obtained from a 30 L pilot batch reactor, used for single stage aqueous carbonation and for the dissolution of heat activated lizardite and compares this data to the laboratory scale data obtained under similar reaction conditions. Two mineral feeds, heat activated lizardite produced in large quantities in a gas fired industrial kiln (“P.H.A”) and heat activated lizardite sample synthesised in a laboratory kiln (“L.H.A”) were characterised and their reactivity was compared.

Characterisation of the two heat activated samples showed that the P.H.A material contained relatively high concentrations of crystalline phases and a lower proportion of amorphous magnesium silicate, as well as a higher average particle size compared to L.H.A. These properties resulted in a reduction in magnesite yield and extent of magnesium extraction when P.H.A samples were used for carbonation and dissolution experiments, compared to the results obtained with L.H.A. as feed.

The results of aqueous carbonation experiments in the pilot and the laboratory scale reactors using P.H.A exhibited less than 5% variation in repeat experiments. Results indicate that the magnesite yield obtained in the pilot batch reactor was 35 ± 2% higher than that produced in the laboratory scale reactor. The higher yield was attributed to improved mixing in the pilot batch reactor compared to the laboratory scale reactor and consequent removal of the precipitated phases on the surface of heat activated particles in the pilot reactor.

The yield of magnesite in mineral carbonation experiments using demineralised water and tap water was almost identical. Undertaking reaction in 1 M NaCl solution did not have a significant effect, but adding 0.64 M sodium bicarbonate had a notable effect on magnesite yield. Low pressure, low temperature dissolution experiments using L.H.A sample displayed similar rates of magnesium extraction in the pilot and the laboratory scale reactors.

这项研究检查了从30升中试间歇式反应器获得的实验数据，该反应器用于单级含水碳酸化和热活化蜥蜴石的溶解，并将该数据与在类似反应条件下获得的实验室规模数据进行了比较。对两种矿物原料进行了表征，分别是在燃气工业窑炉（“ PHA”）中大量生产的热活化蜥蜴石和在实验室窑炉（“ LHA”）中合成的热活化蜥蜴石样品，并对其反应性进行了比较。

与LHA相比，对两个热活化样品的表征表明，PHA材料包含相对较高的结晶相浓度和较低比例的无定形硅酸镁，以及较高的平均粒径。这些性质导致菱镁矿产量和程度降低将PHA样品用于碳酸化和溶解实验时的镁提取量与LHA用作进料的结果相比。

在使用PHA的中试和实验室规模反应器中水合碳酸化实验的结果在重复实验中显示不到5％的变化。结果表明，在分批中试反应器中获得的菱镁矿产量比实验室规模反应器中获得的菱镁矿产量高35±2％。与实验室规模的反应器相比，较高的产率归因于中试间歇反应器中混合的改善，并因此除去了中试反应器中热活化颗粒表面上的沉淀相。

在使用去离子水和自来水的矿物碳酸化实验中，菱镁矿的产量几乎相同。在1 M NaCl溶液中进行反应没有显着影响，但是添加0.64 M碳酸氢钠对菱镁矿的产量有显着影响。使用LHA样品进行的低压，低温溶解实验显示，在中试和实验室规模的反应器中，镁的提取率相似。