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Method for producing polyaluminium sulfate by using red mud slag

A technology of polymerizing aluminum sulfate and red mud, which is applied in the field of metallurgy, can solve problems such as toxicity and residual aluminum ions, and achieve fast reaction speed, easy operation, and good leaching effect

Active Publication Date: 2014-02-19
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, polyaluminum sulfate is mostly used in the production of drinking water purification, and is used in the flocculation process. The coagulation effect of polyaluminum chloride is better, and the color of the treated water is basically unchanged, but aluminum ions will remain in drinking water, resulting in toxicity problem

Method used

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  • Method for producing polyaluminium sulfate by using red mud slag
  • Method for producing polyaluminium sulfate by using red mud slag
  • Method for producing polyaluminium sulfate by using red mud slag

Examples

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Effect test

Embodiment 1

[0044] The solid waste red mud produced by alumina contains 8% iron in the slag after iron recovery. The slag is mixed with concentrated sulfuric acid for sulfation roasting. Water, immerse in water for 1.5 hours, filter, and extract the metal salt mixed solution after water immersion and filtration with P2O4 extraction mixed solvent, the volume ratio of P2O4 extraction mixed solvent and metal salt mixed solution is 1:8, extract rare metal slag, extract The remaining aluminum sulfate solution composition Al 2 o 3 35.24g / L, TiO 2 18.02g / L 、Na 2 O 23.1g / L 、Fe 2 o 3 8.72g / L, Sc 2 o 3 0.32mg / L, add lime milk to carry out alkalization polymerization reaction, control the pH value of the solution to 2.5, temperature 60°C, hydrolyze to separate titanium and iron, when the basicity is 20%, add stabilizer, continue to add lime milk for emulsification Reaction, after the basicity reaches 40%, the solution is press-filtered, and the filter residue is titanium-rich slag, and th...

Embodiment 2

[0046] The solid waste red mud produced by alumina contains 5% iron in the slag after iron recovery, and the slag is mixed with concentrated sulfuric acid for sulfation roasting. The weight of the slag and concentrated sulfuric acid is 1:1, roasted for 1 hour, and then added twice water, immerse in water for 2 hours, filter, and extract the metal salt mixed solution after water immersion and filtration with P2O4 extraction mixed solvent. al 2 o 3 47.26g / L, TiO 2 10.58g / L, Na 2 O 10.60g / L, Fe 2 o 3 5.15g / L, Sc 2 o 3 0.65mg / L, heat to 75°C and add milk of lime to carry out alkalization polymerization reaction, control the pH value of the solution to 2.5-3.0, stir for 1 hour to hydrolyze out titanium and iron, and when the basicity reaches 15%, add stabilizer and continue Add milk of lime for emulsification reaction. After the basicity reaches 45%, press filter the solution. The filter residue is titanium-rich slag. 52.4% of polyaluminum sulfate products.

Embodiment 3

[0048] The red mud is first dried to remove most of the water, so that the water content of the red mud is 12% of the total weight, and the red mud with a certain water content is made into balls, and then the red mud balls are dried by using the heat of the tail gas combustion of the reduction furnace , and then dry red mud balls, coke, limestone, and dolomite are mixed in a ratio of 25:15:2:1, added to the reduction furnace for ironmaking, and iron and slag are obtained by separating iron slag. The slag is added to the reduction furnace for ironmaking. The temperature of the hot air in the reduction furnace for ironmaking is 900-1000°C, the wind pressure is 220mmHg, the melting temperature in the furnace is 1550-1600°C, and the furnace temperature is higher than 1400°C. Iron and slag are obtained by separating the iron slag. The solid waste red mud produced by alumina contains 3% iron in the slag after recycling iron, and the slag is mixed with concentrated sulfuric acid for ...

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Abstract

The invention provides a method for producing polyaluminium sulfate by using a red mud slag. The method comprises the following steps: iron in the red mud is recovered, wherein the red mud is a solid waste produced in the production of aluminium oxide, the slag is blended with concentrated sulfuric acid after the recovery of iron to conduct sulfurizing roasting, then water leaching is implemented to obtain an aluminum sulfate solution containing rare metals like rare earth, the rare metal slag is extracted through extraction, the raffinate is added into lime milk to conduct an alkalized polymerization reaction, the pH value and the temperature of the raffinate are controlled, the impurities like titanium and iron are separated through hydrolysis, a stabilizing agent is added at the low basicity, then lime milk is added to conduct an emulsion reaction, the solution is subjected to filter pressing when the basicity reaches a preset value, the filter residue is a titanium-rich slag, the liquid subjected to the filter-pressing is put into an aging vat and aged to obtain a high-concentration polyaluminium sulfate product. The method has the advantages of simple process and feasible operation, the comprehensive utilization of the red mud is achieved, the correlative charge for the stockpiling of the red mud is reduced, and meanwhile, the influence caused by the stockpiling of the red mud to the environment and the accident potential are also eliminated.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for recovering aluminum from red mud slag, the waste waste of extracting alumina from ores. Background technique [0002] In the alumina production of aluminum ore by the Bayer process, bauxite is mixed with lime and circulating lye to make qualified pulp and then dissolved. Under the action of high temperature and high pressure, the alumina in the ore enters the solution, and the insoluble matter is red mud. After the dissolution, the ore pulp is diluted and settled for solid-liquid separation, and the bottom flow red mud slurry produced is reverse washed three times, filtered to recover the attached alkali, and then discharged. The production of 1 ton of alumina will produce 1.1-1.5 tons of red mud. With the rapid development of the alumina industry in recent years, the global annual alumina production has reached nearly 100 million tons, and China's alumina production in 201...

Claims

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Application Information

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IPC IPC(8): C01F7/74C02F1/52
Inventor 刘保伟甘霖张正林许家伟梁愈斌谭金玉吴缨
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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