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A flexible composite spinel tin refractory material for pyrometallurgy and its preparation method

A technology of refractory materials and precious metals, which is applied in the field of flexible composite spinel tin refractory materials for pyrometallurgy and its preparation, and can solve the problem of poor performance in resisting the erosion of precious metal smelting slag, flexibility and heat Insufficient shock stability, affecting the service life of the kiln, etc., to achieve excellent resistance to slag erosion, enhance the performance of resisting slag erosion, and improve the performance of resisting precious metal smelting slag erosion

Inactive Publication Date: 2017-01-04
郑州汇特耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, chromium-aluminum refractories and aluminum-chromium-zirconium refractories have high high-temperature strength and excellent resistance to high-temperature melt erosion, but their resistance to erosion by precious metal smelting slag cannot be well improved
Moreover, its flexibility and thermal shock stability are not as good as magnesia-chrome bricks, which leads to fractures within a short period of use and affects the service life of the kiln. The finished production cycle is usually 15-20 days, which is much higher than the 6-7 days of the tunnel kiln firing production cycle, and the thermal efficiency of the smoke-removing kiln is low, polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A flexible composite spinel tin refractory material for pyrometallurgy, which is made of the following raw materials in proportion by weight:

[0024] 76 parts of dense corundum sand of 5mm~0mm, 15 parts of chromium slag of 3mm~0mm, 6.0 parts of magnesia of 1mm~0mm, 1.5 parts of chrome green ≤0.045mm, 1 part of fused zirconia of ≤0.045mm; 0.5 part of tin oxide of ≤0.045mm , the binder is a mixed solution of phosphoric acid and oxalic acid (the mass ratio of phosphoric acid and oxalic acid is 9:1), and the amount added is the total weight of dense corundum sand, chrome slag, magnesia, chrome green, fused zirconia and tin oxide 4%.

[0025] The manufacture method of above-mentioned flexible composite spinel tin refractory material is as follows:

[0026] a) taking according to the raw material weight ratio described in claim 1;

[0027] b) adding the good raw materials to the binding agent described in claim 1, and mixing in a strong sand mixer;

[0028] c) The mixed m...

Embodiment 2

[0034] A flexible composite spinel tin refractory material for pyrometallurgy, which is made of the following raw materials in proportion by weight:

[0035] 66 parts of 5mm~0mm dense corundum sand, 20 parts of 3mm~0mm chromium slag, 8.5 parts of 1mm~0mm magnesia, 2.5 parts of chrome green ≤0.045mm, 2 parts of fused zirconia ≤0.045mm; 1 part of tin oxide ≤0.045mm , the binder is a mixed solution of phosphoric acid and oxalic acid (the mass ratio of phosphoric acid and oxalic acid is 9:1), and the amount added is the total weight of dense corundum sand, chrome slag, magnesia, chrome green, fused zirconia and tin oxide 6%.

[0036] The preparation method is the same as in Example 1.

[0037]Implementation effect: product testing results are shown in Table 4

Embodiment 3

[0039] A flexible composite spinel tin refractory material for pyrometallurgy, which is made of the following raw materials in proportion by weight:

[0040] 57 parts of 5mm~0mm dense corundum sand, 25 parts of 3mm~0mm chromium slag, 10 parts of 1mm~0mm magnesia, 3.5 parts of chrome green ≤0.045mm, 3 parts of fused zirconia ≤0.045mm; 1.5 parts of tin oxide ≤0.045mm , the binder is a mixed solution of phosphoric acid and oxalic acid (the mass ratio of phosphoric acid and oxalic acid is 9:1), and the amount added is the total weight of dense corundum sand, chrome slag, magnesia, chrome green, fused zirconia and tin oxide 8%.

[0041] The preparation method is the same as in Example 1.

[0042] Implementation effect: product testing results are shown in Table 4

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PUM

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Abstract

The invention discloses a flexible composite spinel tin refractory material for smelting precious metals by pyromethod and its preparation method. Introduce fused zirconia, use zirconia to produce microcracks during the firing process to improve the thermal shock stability of the product, and introduce tin oxide to form magnesium tin spinel to change the lattice structure, thereby improving the flexibility of the product Performance and resistance to corrosion by precious metal smelting slag. It is of great significance to solve the thermal spalling and structural spalling damage of the lining refractories of precious metal smelting kilns during use, and improve the service life of the lining refractories of precious metal smelting kilns as a whole.

Description

technical field [0001] The invention relates to the technical field of refractory materials for smelting precious metals by pyromethods, in particular to a flexible composite spinel tin refractory material for smelting precious metals by pyromethods and a preparation method thereof. Background technique [0002] At present, magnesia-chrome bricks are mostly used in pyro-method precious metal smelting furnaces. Magnesia-chrome bricks have good resistance to slag erosion, but poor flexibility. Volume scour and penetration performance could not be better improved so far Cr 2 o 3 Magnesia-chrome bricks with a content of 16-24% are still commonly used refractory materials in pyrometallurgical smelting. [0003] The existing technology is to apply chrome-aluminum refractory materials and aluminum-chromium-zirconium refractory materials to pyrometallurgical precious metal smelting kilns. The chrome-aluminum and aluminum-chromium-zirconium refractory materials start with chromium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 董跃慕松林董梅花
Owner 郑州汇特耐火材料有限公司