响应面分析法优化废铁屑制备硫酸亚铁条件
Optimization of Ferrous Sulfate Preparing from Waste Iron Chips by Response Surface Analysis

为了促进废铁屑的再利用，实现废物资源化。本文利用废铁屑制备硫酸亚铁，运用单因素试验方法研究了硫酸浓度、反应温度、n(Fe):n(H₂SO₄)对制备硫酸亚铁的影响，采用响应面分析法中的Box-Behnken试验模型设计优化了其制备条件。单因素试验方法中，最佳硫酸浓度、最佳反应温度、最佳n(Fe):n(H₂SO₄)分别为18%、65℃、0.75:1。响应面分析法优化结果：硫酸浓度为18.40%，反应温度为69.66℃，n(Fe):n(H₂SO₄)为0.7:1。铁转化率高达100%，自然状态下结晶回收率达91.29%，硫酸亚铁晶体纯度为91.72%，达到《水处理剂硫酸亚铁》(GB/T 10531-2016) I类标准。
In order to promote the reuse of scrap iron and realize the recycling of waste, ferrous sulfate was prepared from scrap iron. The effects of sulfuric acid concentration, reaction temperature and n(Fe):n(H₂SO₄) on the preparation of ferrous sulfate were studied by single factor test method. In response surface analysis, Box-Behnken test model was used to design and optimize the prepara-tion conditions of ferrous sulfate. In the single factor test method, the optimum sulfuric acid con-centration, reaction temperature and n(Fe):n(H₂SO₄) respectively were 18%, 65？C and 0.75:1. The optimization results of response surface methodology were as follows: sulfuric acid concentration was 18.40%, reaction temperature was 69.66？C, n (Fe):n(H₂SO₄) was 0.7:1. The iron conversion rate is as high as 100%, the rate of crystallization recovery in natural state is 91.29%, and the crystal purity of ferrous sulfate is 91.72%, which meets the Class I standard of “Water Treatment Agent Ferrous Sulfate” (GB/T 10531-2016).