Method for processing Bayer process red mud through calcification-carbonization one-step method

A technology of Bayer red mud and step method, which is applied in the production of alumina/hydroxide, cement, etc., can solve the problem of not completely solving the problem of energy consumption in the production process of red mud containing alkali, and achieve the reduction of mine consumption and energy consumption. Consumption and operating costs, the effect of low production energy consumption

Active Publication Date: 2016-10-12
NORTHEASTERN UNIV
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Problems solved by technology

[0004] The above-mentioned patented technologies are all aimed at energy saving and consumption reduction in the alumina production process and the harmless utilization of

Method used

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  • Method for processing Bayer process red mud through calcification-carbonization one-step method

Examples

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Example Embodiment

[0041] Example 1

[0042] The method for processing Bayer process red mud by calcification-carbonization one-step method specifically comprises the following steps:

[0043] Step 1, Calcification Transformation

[0044] (1) Mix Bayer process red mud, lime and clear water to form a mixed slurry with a ratio of liquid volume to solid mass of 2:1; wherein, according to m 1 :m 2 = 0.5;

[0045] (2) Carry out calcification transformation under the condition that the temperature of the mixed pulp is 80°C and the reaction time is 20 minutes;

[0046] In step 1, the main reaction of the calcification transformation process is (1);

[0047] Step 2, carbonization transformation

[0048] (1) In the slurry system formed after calcification transformation, add clear water to adjust the ratio of liquid volume to solid mass in the slurry system to 3:1;

[0049] (2) Into the adjusted pulp system, feed CO 2 Component gas, CO 2 The gas partial pressure is 0.4MPa, and the carbonization t...

Example Embodiment

[0054] Example 2

[0055] The method for processing Bayer process red mud by calcification-carbonization one-step method specifically comprises the following steps:

[0056] Step 1, Calcification Transformation

[0057] (1) Mix Bayer process red mud, lime and water to form a mixed slurry with a ratio of liquid volume to solid mass of 3:1; wherein, according to m 1 :m 2 = 1;

[0058] (2) Carry out calcification transformation under the condition that the mixed ore pulp is at a temperature of 90°C and a reaction time of 40 minutes;

[0059] In step 1, the main reaction of the calcification transformation process is (1);

[0060] Step 2, carbonization transformation

[0061] (1) In the slurry system formed after calcification transformation, add clear water to adjust the ratio of liquid volume to solid mass in the slurry system to 4:1;

[0062] (2) Into the adjusted pulp system, feed CO 2 Component gas, CO 2 The gas partial pressure is 0.6MPa, and the carbonization transf...

Example Embodiment

[0067] Example 3

[0068] The method for processing Bayer process red mud by calcification-carbonization one-step method specifically comprises the following steps:

[0069] Step 1, Calcification Transformation

[0070] (1) The Bayer process red mud, lime and Na 2 Sodium hydroxide solution with O mass concentration ≤ 40g / L is mixed to form a mixed slurry with a ratio of liquid volume to solid mass of 4:1; wherein, according to m 1 :m 2 = 2;

[0071] (2) Carry out calcification transformation under the condition that the temperature of the mixed pulp is 100°C and the reaction time is 60 minutes;

[0072] In step 1, the main reaction of the calcification transformation process is (1);

[0073] Step 2, carbonization transformation

[0074] (1) Add Na to the slurry system formed after calcification transformation 2 O sodium hydroxide solution with mass concentration ≤ 40g / L, adjust the ratio of liquid volume to solid mass in the slurry system to 5:1;

[0075] (2) Into the ...

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Abstract

The invention relates to a method for processing Bayer process red mud through a calcification-carbonization one-step method and belongs to the field of environmental protection. The method comprises the steps of first mixing Bayer process red mud, lime and transition liquid, causing the transition liquid to be clear water or a solution with the mass concentration of Na2O not larger than 40 g/L, and calcifying the mixed pulp; causing the pulp after the transition not to undergo solid-liquid separation, directly adding pressurized gas containing a CO2 component into a reaction system, and performing a carbonization transition reaction; causing the pulp having undergone the carbonization transition to undergo solid-liquid separation, obtaining tailings and a liquid phase, causing the tailings to undergo aluminum hydroxide extraction through soluble aluminum mother liquid and then serve as a cement industry raw material or soil, and causing the liquid phase to return a Bayer process system. According to the method, red mud no-alkalinization and aluminum oxide recycling can be achieved through calcification-carbonization one-step transition processing, and the method is an energy-saving environment-friendly Bayer process red mud short process processing method.

Description

Technical field: [0001] The invention relates to the technical field of environmental protection, in particular to a one-step calcification-carbonization method for processing Bayer process red mud. Background technique: [0002] Since 2007, China's aluminum industry has entered a stage of rapid development. In 2014, my country's alumina production capacity reached about 50 million tons, twice that of 2007 (about 7 times that of 2004), and the discharge of red mud also reached 50 million tons. Tons, production capacity and emissions accounted for about 50% of the world. High-alkali red mud is the solid waste with the largest discharge in the aluminum industry. Every ton of alumina produced will produce 1-1.4 tons of red mud. At present, the total stockpiles in my country have reached about 400 million tons. The pH value of Bayer red mud is 11.0-12.0, which is highly corrosive to organisms and metal materials. The alkalinity of red mud attached liquid is as high as 26348mg / L...

Claims

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Application Information

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IPC IPC(8): C01F7/02C04B7/14
CPCC01F7/02C04B7/14Y02P40/10
Inventor 张廷安吕国志刘燕豆志河解立群王艳秀张子木赵秋月张伟光
Owner NORTHEASTERN UNIV
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