以煤矸石高效利用为目的，采用响应曲面实验设计优化煤矸石铝铁分离液制备氧化铁红颜料工艺，研究了Na₂CO₃浓度、反应温度和Fe(II)浓度等因素对氧化铁红颜料纯度的影响；在单因素实验基础上，对实验设计进行优化，分析了产物的物相结构和微观形貌. 结果表明，在Na₂CO₃浓度107 g/L、反应温度43℃及Fe(II)浓度0.26 mol/L的条件下，所得氧化铁红产品纯度可达96.09%，纯度及其它指标均满足GB/T1863-2008中A级氧化铁红要求. 铁红中间产物为针状a-FeOOH和g-FeOOH，煅烧后针状消失，得到结晶较好的a-Fe₂O_3.

Technology that prepared iron oxide red pigment from the separator liquid between iron and aluminum of coal gangue was optimized though response surface experiment design based on the purpose of coal gangue resource about efficient utilization. The effects of Na₂CO₃ concentration, reaction temperatures and Fe(II) concentration on the purity of the iron oxide red pigment were researched. The response surface experiment design was employed to optimize based on the single factors experiments, phase structure from products and microstructural aspects were analyzed. The results indicated that the purity of the iron oxide red pigment can be reach to 96.09% when Na₂CO₃ concentration was 107 g/L, reaction temperature was 43℃and Fe(II) concentration was 0.26 mol/L. The purity and other indicators could meet the requirement of a kind iron oxide red from standard specifies iron oxide red pigment GB/T1863-2008. The intermediate products was a-FeOOH and g-FeOOH with obvious needle aspects and that disappeared by calcination then a-Fe₂O₃ withbetter crystalline was obtained.