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Method for deeply removing silicon and iron from chromite alkaline leachate

A technology of chromite ore and leaching solution, which is applied in the field of deep removal of ferrosilicon by alkaline leaching solution of chromite ore, can solve the problems that affect the purity of the produced product and cannot realize deep removal, and achieve low production cost, mild conditions and short production cycle short effect

Inactive Publication Date: 2021-08-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the method, quicklime and / or lime milk prepared by beating quicklime are used as a silicon fixing agent to remove silicon, but the deep removal of Si and Fe in the alkaline leachate under weakly alkaline conditions cannot be realized. Will affect the purity of subsequent production products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment provides a method for deep removal of ferrosilicon by alkaline leaching solution of chromite ore, and the method for deep removal of ferrosilicon comprises the following steps:

[0050] (1) Pass CO into the sodium aluminate solution with a concentration of 20g / L 2 gas makes CO 3 2- The concentration reaches 60g / L, and then mixed with calcium hydroxide according to the mass ratio of 1:2.5. The reaction temperature of the mixed reaction is 85°C, the stirring speed is 350r / min, and the reaction time is 3h. The prepared product contains 30% Calcium hydroxide, 40% calcium aluminum carbonate, 20% calcium aluminate, and the rest are desiliconization agents for crystal water;

[0051] (2) Add the desiliconizing agent obtained in step (1) to Na 2 CrO 4 250g / L, NaAlO 2 50g / L, NaVO 3 2g / L, as SiO 2 The calculated Si content is 200mg / L, based on Fe 2 o 3 The calculated Fe content is 80 mg / L, and the pH is 14 in the chromite alkaline leaching solution, and t...

Embodiment 2

[0053] This embodiment provides a method for deeply removing ferrosilicon from chromite alkaline leaching solution. In this embodiment, except that in step (1), "the reaction temperature of the mixed reaction is 20°C, and the reaction time is 0.5h, the prepared Containing 59% calcium hydroxide, 1% calcium aluminum carbonate, 40% calcium aluminate desiliconization agent", other conditions are exactly the same as in Example 1, after the reaction is completed, filter, and in the filtrate, use SiO 2 The calculated Si content is 40mg / L, based on Fe 2 o 3 The calculated Fe content is 8mg / L.

Embodiment 3

[0055] This embodiment provides a method for deep removal of ferrosilicon from chromite alkaline leaching solution. In this embodiment, except that in step (1), "the reaction temperature of the mixed reaction is 100 ° C, and the reaction time is 8h, the prepared product containing 20% calcium hydroxide, 40% calcium aluminate, all the other are the desiliconization agent of crystal water ", other conditions are exactly the same as embodiment 1, filter after completion of the reaction, in the filtrate, use SiO 2 The calculated Si content is 4mg / L, based on Fe 2 o 3 The calculated Fe content is 2mg / L.

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Abstract

The invention relates to a method for deeply removing silicon and iron from chromite alkaline leachate. The chromite alkaline leachate comprises leachate extracted from chromite by adopting a calcium-free roasting method and / or a liquid-phase oxidation method, a desiliconizing agent and a flocculating agent are sequentially added into the chromite alkaline leachate, after the reaction is completed, the silicon and iron are deeply removed through filtration, and the desiliconizing agent comprises a precipitator and calcium aluminate. According to the method for deeply removing the silicon and iron, a chemical precipitation-adsorption combined flocculating settling method is adopted, silicon and iron in the alkaline leachate can be deeply removed by controlling the desiliconizing agent and reaction conditions, and even the silicon and the iron can be deeply removed to 5 mg / L and 0.1 mg / L respectively; and in addition, the deep silicon and iron removal method not only is beneficial to solving the problem of smooth production of the chromium salt and providing guarantee on purity of the subsequently produced chromium salt, but also can ensure that the silicon content and the iron content of pseudo-boehmite products reach the standard.

Description

technical field [0001] The invention relates to the field of chromium salt production, in particular to a method for deep removal of ferrosilicon from chromite alkaline leaching solution. Background technique [0002] Chromium salt is an important basic raw material of inorganic chemical industry, and the main raw material for production is chromite ore. The chromium salt industry mainly adopts production processes such as calcium-free roasting method and liquid phase oxidation method. During the extraction process of chromium, most of the chromium, aluminum and vanadium in chromite will be converted into Na 2 CrO 4 , NaAlO 2 、NaVO 3 and other soluble sodium salt forms into the leachate. In addition, some aluminum, silicon and iron compounds will also enter the leaching solution and become the main impurities in the alkaline leaching solution. [0003] In order to remove aluminum impurities, the method of neutralization and hydrolysis to remove aluminum is widely used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B3/24C22B3/22C22B34/32C01G37/14
CPCC22B3/44C22B3/24C22B3/22C22B34/32C01G37/14Y02P10/20
Inventor 李平陈兴张贺杰张盈张洋郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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