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Online desulfurizing agent for aluminum oxide production and using method thereof

A technology of alumina and desulfurization agent, applied in the purification of aluminate/alumina/aluminum hydroxide, preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the influence of desulfurization effect and the limitation of sulfur treatment limit , the use of high-sulfur ore has not been effectively solved and other problems, to achieve low desulfurization cost, save output cost, and good effect.

Pending Publication Date: 2021-04-20
贵州华锦铝业有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this method has a certain limitation on the treatment limit of sulfur. If the sulfur content of the ore is too high, the desulfurization effect will be seriously affected.
Therefore, the problem of using high-sulfur ore has not been effectively solved. At present, high-sulfur bauxite and low-sulfur bauxite are mixed and used, and the sulfur content index of ore entering the production system is strictly controlled, and the method of on-line desulfurization is adopted. To achieve the purpose of desulfurization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] An online desulfurizer for alumina production and its use method, which is calcium nitrate; the use method of the online desulfurizer is based on the alumina production process, adding Calcium nitrate, the low-valent sulfur in the sodium aluminate solution is oxidized to intermediate-valent sulfur or high-valent sulfur through calcium nitrate, that is, the S in the sodium aluminate solution 2- Gradually oxidized to S 2 o 3 2- , SO 3 2- , SO 4 2- , and let the intermediate valence sulfur and high valence sulfur be discharged from the system along with the red mud, so as to eliminate the influence of sulfur on key links such as dissolution and settlement, decomposition, evaporation, equipment corrosion, and product quality in the alumina production process.

[0016] The bauxite ore contains 0.45% sulfur, and the calcium nitrate addition is 1.6g / g-St. Among them, the calcium nitrate is purchased from the market and is analytically pure. The dissolution temperature is...

Embodiment 2

[0018] An online desulfurizer for alumina production, which is calcium nitrate slurry; the calcium nitrate slurry is mixed with one or more of limestone, lime, milk of lime, lime emulsified slag, and causticized slag from salt discharge through nitric acid And the product after alkalization, the pH of the calcium nitrate slurry after alkalization by milk of lime is greater than 7.

[0019] During use, adopt 65% nitric acid and milk of lime, volume ratio is 45:100; Under normal temperature condition, react 1h to obtain the calcium nitrate slurry that pH is 9.82; Carry out desulfurization test according to the condition in example 1, stripping solution S after the test 2- 0.213g / l, the solution Fe 2 o 3 0.036g / l, S 2- and Fe 2 o 3 Both indicators can achieve the same desulfurization effect.

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Abstract

The invention discloses an online desulfurizing agent for aluminum oxide production and a using method thereof. The online desulfurizing agent is calcium nitrate or calcium nitrate slurry. The using method of the online desulfurizing agent is characterized in that: calcium nitrate or calcium nitrate slurry is added in a pre-desilicication stage, a raw ore pulp preparation stage or a circulating mother liquor stage on the basis of an aluminum oxide production process; low-valence sulfur in the calcium nitrate or calcium nitrate slurry is oxidized into intermediate-valence sulfur and high-valence sulfur, so that the sulfur in a sodium aluminate solution is promoted to be discharged out of a system along with red mud; and therefore, the influence of the sulfur on key links such as dissolution, sedimentation, decomposition and evaporation in the aluminum oxide production process, equipment corrosion and product quality is eliminated. The agent can be deeply combined with a production line, and can facilitate online desulfurization.

Description

technical field [0001] The invention relates to an online desulfurizer for alumina production and a method for using the same, belonging to the technical field of alumina production. Background technique [0002] The content of impurity sulfur in existing ores is getting higher and higher. Sulfur in bauxite ore mainly exists in the form of pyrite. In the process of producing alumina by alkaline method, pyrite in bauxite reacts with alkali to make sulfur State S 2- form into the sodium aluminate solution, S 2- After entering the production system, it will not only seriously affect the production processes such as dissolution and sedimentation, evaporation, and decomposition, but also cause corrosion of system equipment, make the iron content of alumina products exceed the standard, and reduce the quality of alumina products. [0003] Desulfurization methods are mainly divided into ore desulfurization and online desulfurization in the production process. Desulfurization meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/47
Inventor 王文志张天星曾宪飞
Owner 贵州华锦铝业有限公司
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