铜冶炼废渣脱硅工艺研究

doi:10.19964/j.issn.1006-4990.2020-0601

无机盐工业 ›› 2021, Vol. 53 ›› Issue (9): 83-87.doi: 10.19964/j.issn.1006-4990.2020-0601

铜冶炼废渣脱硅工艺研究

孙双双^1,²(),仲剑初^1,²(),王洪志^1,²

1.大连理工大学精细化工国家重点实验室,辽宁大连 116024
2.辽宁省硼镁特种功能材料制备与应用技术工程实验室

收稿日期:2020-12-15 出版日期:2021-09-10 发布日期:2021-09-08
作者简介:孙双双（1994— ）,女,硕士研究生,主要从事资源化工研究;E-mail： 1829104204@qq.com。

Study on desiliconization process of copper smelting slag

Sun Shuangshuang^1,²(),Zhong Jianchu^1,²(),Wang Hongzhi^1,²

1. State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116024,China
2. Engineering Laboratory of Boric and Magnesic Functional Material Preparative and Applied Technology,Liaoning Province

Received:2020-12-15 Published:2021-09-10 Online:2021-09-08

摘要/Abstract

摘要：

以铜冶炼废渣[简称铜渣,主要成分为铁橄榄石（Fe₂SiO₄）]为原料,采用钠化焙烧的方法脱除废渣中的硅,研究了以氢氧化钠为钠化剂对铜渣脱硅的影响。首先采用正交实验探究了焙烧温度、矿碱质量比、焙烧时间等因素对铜渣脱硅的影响顺序,在此基础上采用单因素实验研究了铜渣脱硅的适宜工艺条件。结果表明：铜渣脱硅影响因素由大到小的顺序为焙烧温度、矿碱质量比、焙烧时间。铜渣脱硅的适宜工艺条件：焙烧温度为650 ℃,矿碱质量比为1∶1.75（氢氧化钠理论量的4.17倍）,焙烧时间为180 min。在此条件下铜渣钠化焙烧所得产物的水浸渣中二氧化硅的质量分数降至1.74%,脱硅率达到94.5%。焙烧产物及其水浸渣的X射线衍射分析表明,铜渣钠化焙烧脱硅的机理是铁橄榄石转化为铁酸钠和硅酸钠,铜渣中的铁最终以四氧化三铁的形式存在,硅以硅酸钠的形式脱除。

关键词: 铜冶炼废渣, 铁橄榄石, 钠化焙烧, 脱硅

Abstract:

A sodium-roasting process was employed for removing silicon from a kind of copper smelting slag（here in after re-ferred to as copper slag） which mainly consists of ferric silicate.The effect of NaOH as sodiumizing agent on desiliconization process of copper slag was investigated.First,the orthogonal experiment method was used to explore the sequence of the influ-ence of the mass ratio of ore to alkali,roasting temperature and roasting time on desiliconization of copper slag.On this basis,the suitable process conditions for desiliconization of copper slag was investigated by the single factor variable method.The results indicated that the order of factors affecting silicon removal in the orthogonal experiment was roasting temperature>mass ratio of ore to alkali>roasting time,the optimal processing parameters were roasting temperature of 650 ℃,mass ratio of ore to alkali 1∶1.75（4.17 times of the oretical amount of NaOH）,and roasting time of 180 min,the content of SiO₂ in the water leaching product of copper slag by sodium-roasting was 1.74%,and the desiliconization rate was 94.5% under these conditions.X-ray diffraction analysis of calcined products and their water leaching residues showed that the desiliconization mechanism of copper slag by sodium-roasting process could be described that ferric silicate was transformed NaFeO₂,NaFe₂O₃ and Na₂O·nSiO₂,the iron in the copper slag eventually existed in the form of Fe₃O₄,silicon was finally removed in the form of Na₂O·nSiO₂.

Key words: copper smelting slag, ferric silicate, sodium roasting, silicon removal

中图分类号:

X781

孙双双,仲剑初,王洪志. 铜冶炼废渣脱硅工艺研究[J]. 无机盐工业, 2021, 53(9): 83-87.

Sun Shuangshuang,Zhong Jianchu,Wang Hongzhi. Study on desiliconization process of copper smelting slag[J]. Inorganic Chemicals Industry, 2021, 53(9): 83-87.

图/表 6

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参考文献 12

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水平		因素
水平	A焙烧温度/℃	B焙烧时间/min	C矿碱质量比
1	500	90	1:1.0
2	600	120	1:2.0
3	650	180	1:2.5

实验序号	因素			脱硅率/%
实验序号	A	B	C	脱硅率/%
1	1	1	3	80.975
2	1	2	1	81.335
3	1	3	2	84.123
4	2	1	1	88.351
5	2	2	2	89.251
6	2	3	3	88.981
7	3	1	2	90.196
8	3	2	3	89.026
9	3	3	1	88.302
k₁	82.144	86.507	85.996
k₂	88.866	86.544	87.857
k₃	89.174	87.135	86.327
r	7.030	0.628	1.861

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