采用富硼渣硫酸法处理富硼渣，通过单因素试验和正交试验确定了富硼渣硫酸浸出的最佳试验条件。针对硫酸浸出液开发了先高温结晶制取一水硫酸镁再低温结晶制备硼酸工艺。结果表明：浸出温度为99℃，酸用量为理论用量的95%，浸出液固比为6：1，浸出时间为90 min时，B浸出率为98.76%，Mg浸出率达到74.32%。通过灰色关联分析理论对Mg的浸出率进行预测，预测值为75.06%，预测结果和实验结果具有较好的一致性。制得的一水硫酸镁纯度为95.42%，硼酸的纯度达到99.27%。
The sulfuric acid was used to decomposing boron-rich slag. The best test conditions of the boron-rich slag sulfuric acid leaching were determined by single factor and orthogonal experiments. The high temperature crystallization preparation of magnesium sulfate monohydrate and low temperature crystallization preparation boric acid were developed by sulfuric acid leaching solution. The results show that the optimum parameters are leaching temperature of 99℃, the sulfuric acid theoretical of 95%dosage, leaching time of 90 min and leaching liquid to solid ratio of 6:1. Under these conditions, the leaching rates of B and Mg are 98.76%and 74.32%, respectively. The leaching rate of Mg predicted by gray relational theory and the predictive value is 75.06%. A good agreement between the actual and predicted results is obtained. The purity of magnesium sulfate monohydrate and boric acid obtained by this method are 95.42%and 99.27%, respectively.
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