Dissolution method of diasporic bauxite

A technology of bauxite and bauxite, applied in chemical instruments and methods, preparation of alkali metal aluminate/aluminum oxide/aluminum hydroxide, aluminum compounds, etc., can solve the problem of large lime consumption and alkali content in effluent red mud High-level problems, to achieve the effect of reducing production economic costs, improving red mud composition, and good industrial application prospects

Active Publication Date: 2021-01-01
CENT SOUTH UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

The application requires a large amount of lime consumption, and the alkali content of the discharged red mud is relatively high, which brings great risks to the environment

Method used

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  • Dissolution method of diasporic bauxite

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Comparison scheme
Effect test

Embodiment 1

[0028] Dissolution of diaspore ore, the specific operation process is as follows figure 1 As shown, 30g of Shanxi mine A (the specific composition is shown in Table 1) and 60mL of sodium aluminate solution (Na 2 o K : 220g / L, α K : 2.9, alpha K is the molar ratio of sodium oxide to alumina), added to the low-pressure steel bomb, added steel balls to strengthen stirring, and pre-desiliconized at a temperature of 90 ° C for 4 hours (pre-desiliconized bauxite is mixed with the circulating mother liquor, stirred, and kept warm The process of removing silicon from ores). Dissolution red mud mixed with lime, CaO / Na 2 The molecular ratio of O is 4, and the liquid-solid ratio is 4. Take 0.2g of dried dealkalized red mud and pre-desiliconized slurry, mix it into high-pressure steel bombs, replenish the circulating mother liquor to 100ml, dissolve at a temperature of 260°C for 60 minutes, separate the solid-liquid of the dissolved slurry, and the aluminum-silicon ratio of the red m...

Embodiment 2

[0034] The basic content of this embodiment is the same as that of embodiment 1, the difference is that after the red mud is dissolved and mixed with lime, the CaO / Na 2 The molecular ratio of O is 2, and the liquid-solid ratio is 5. Take 0.4g of dried dealkalized red mud and pre-desiliconized slurry and mix it with the high-pressure steel bomb. The dissolution rate is 98.95%.

Embodiment 3

[0036] The content of this example is basically the same as Example 1, except that 30g of Shanxi Mine B (the specific components are shown in Table 1) and 60mL of sodium aluminate solution (Na 2 o K : 230g / L, α K : 3.0), pre-desilicate at a temperature of 95°C for 6 hours, and dissolve at a temperature of 260°C for 70 minutes, the relative dissolution rate of alumina is 96.1%, and the amount of red mud is reduced by 32.5% compared with the traditional lime method.

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Abstract

The invention discloses a dissolution method of diasporic bauxite, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: uniformly mixing diasporic bauxite and a circulating mother solution, carrying out pre-desilicication treatment, uniformly mixing the obtained pre-desilicication slurry with dealkalized red mud, carrying out dissolving out at a high temperature, carrying out dilution desilicication and red mud settlement separation washing treatment on the dissolved slurry to obtain red mud, and carrying out lime dealkalization on the red mud to obtain dealkalized red mud; and returning part of the dealkalized red mud to the high-temperature dissolution step, so that calcium is recycled. Compared with the prior art, the method has the advantagesthat the relative dissolution rate of aluminum oxide in the ore is obviously increased, the addition amount of lime can be greatly reduced by replacing lime with dealkalized red mud, waste emission is reduced, environmental protection is facilitated, the cost is low, and the method has industrial application value.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for leaching diaspore type bauxite. Background technique [0002] my country's bauxite reserves are abundant, but from the perspective of bauxite types, my country's bauxite is mainly diaspore-type bauxite, which accounts for about 98% of the total reserves, and generally has high aluminum and high silicon , low-iron and silicon-containing minerals, complex composition, etc., and most of them are ores with medium and low aluminum-silicon ratios, and their aluminum-silicon ratio is about 4-7. About 10% of resources, or even lower. At present, in order to eliminate the blocking effect of titanium minerals, domestic alumina enterprises generally add 8% to 12% lime. In addition to ensuring the full dissolution of diaspore, it also removes fluorine, phosphorus, vanadium and other elements in the solution. The transformation of iron ore plays an important role in delay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06
CPCC01F7/0606C01F7/0646C01F7/0666C01F7/0693
Inventor 周秋生程路伟王一霖李小斌彭志宏刘桂华齐天贵
Owner CENT SOUTH UNIV
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