铜冶炼废渣脱硅工艺研究

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

Abstract

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

CLC Number:

X781

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

Figures/Tables 6

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References 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

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on desiliconization process of copper smelting slag

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