Method for producing alum by utilizing alunite

An alumite and alum technology, which is applied in the field of alum production by using alumite, can solve problems such as low dissolution rate, low dehydration rate, unbalanced ratio, etc., and achieve the effects of reducing production cost, uniform roasting temperature, and adjustable and controllable temperature.

Active Publication Date: 2014-06-18
广西北部湾粮油技术研究有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0010] (2), the output of alum is low
[0011] (3) Lots of waste residue and waste gas
[0012] (4) The production cycle of alum is long and the energy consumption is high
[0013] The main reasons for the above problems: First, the roasting process is unreasonable (the dehydration rate is too low "cooked", the decomposition rate is too high "overburned", A1 2 o 3 Phase transition "burned to death"), A1 in ore 2 o 3 Underutilized, low dissolution rate
The second is that the hydrolysis reaction produces insoluble matter, which is mixed into the alum slurry and alum slag to cause A1 2 o 3 loss
Third, K in the leaching solution 2 SO 4 / A1 2 (SO 4 ) 3 Unbalanced ratio affects the crystallization rate of alum

Method used

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  • Method for producing alum by utilizing alunite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The specific implementation of this embodiment includes the following steps:

[0041] (1), choose alunite mineral powder:

[0042] Alunite ore is crushed, ground or floated to obtain alunite concentrate. The ore grade is 50-65%, and the fineness of ore powder is 80-200 mesh (0.175-0.074mm).

[0043] (2) Mineral powder microwave roasting dehydration:

[0044] The ore powder is roasted and dehydrated with microwave thermal equipment, the microwave frequency is 2450MHz, the microwave output power is 1.0-5.0KW, the microwave radiation time is 10-60min, the dehydration rate of ore clinker is 95-99%, and the decomposition rate is 2-5 % , A1 2 o 3 The dissolution rate is 90-95%.

[0045] (3) Sulfuric acid solution leaching and dissolution, filtration and separation:

[0046] The dehydrated alunite (clinker) is leached and dissolved with sulfuric acid solution, heat-preserved and filtered, solid-liquid separation, the leached residue is washed with hot water, and the was...

Embodiment 2

[0051] The steps of this embodiment are the same as in Embodiment 1. Select alunite concentrate from flotation (alunite A1 in the ore 2 o 3 16.53%, dickite A1 2 o 3 12.56 %, Total A1 2 o 3 29.09%). The fineness of mineral powder is about 200 mesh (0.074mm). The amount of alunite mineral powder is 100 grams, and the mineral powder is dehydrated by microwave roasting, and the microwave radiation time is 30 minutes. Dehydrated alunite (clinker) with 40ml of sulfuric acid (98%), heated 500g of water, heated for leaching and leaching, the leaching and leaching temperature was 100°C, and the leaching and leaching time was 2.0h. Insulation filtration, solid-liquid separation. The leaching residue is washed with hot water, and the washing liquid is incorporated into the leaching liquid. Add 42 grams of potassium sulfate to the leaching solution, and stir to dissolve. The leaching solution is heated, evaporated and concentrated until the concentration of the alum stock soluti...

Embodiment 3

[0053] The steps and experimental conditions of this example are the same as in Example 2. Potassium sulfate was not added in the leaching solution, and 142 grams of potassium alum / aluminum sulfate were obtained, including 40 grams of potassium alum. The crystallization mother liquor is recycled.

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Abstract

The invention relates to a method for producing alum by utilizing alunite, comprising the steps that alunite mineral powder is selected and used, the mineral powder is dehydrated by microwave roasting, sulfuric acid solution is leached and dissolved out, the filtering separation is carried out, the leaching agent is evaporated and concentrated, and the leaching agent is cooled and alum is crystallized. Potassium sulphate is added to the leaching agent, and potassium alum is completely produced; potassium sulphate is not added to the leaching agent, potassium alum is produced, and aluminum sulfate is co-produced; and crystallization mother liquor is recycled. Compared with the existing alum refining technology adopting 'water immersion method' and a vertical coal kiln, the method for producing alum by utilizing alunite has the beneficial effects that the utilization rate of resources is improved, the yield of alum is increased, the production cycle of the alum is shortened, energy sources are saved, the production cost is reduced, waste residues and waste gases are reduced, and the environment is protected.

Description

technical field [0001] The invention belongs to the field of alum production, in particular to a method for producing alum by using alunite. Background technique [0002] Alunite is a water-insoluble potassium aluminum sulfate mineral. The ore should be roasted (dehydration, pyrolysis or reduction pyrolysis) to change the ore structure and improve the chemical reaction performance, and then carry out wet processing, that is, ore roasting and cooked Material leaching is the basic processing method of various technological routes for the comprehensive utilization of alunite. [0003] Dehydration reaction 2KA1 3 (S0 4 ) 2 (OH) 6 =K 2 SO 4 ·A1 2 (S0 4 ) 3 + 2A1 2 0 3 + 6H 2 O (1) [0004] Pyrolysis reaction K 2 SO 4 ·A1 2 (S0 4 ) 3 =K 2 SO 4 +A1 2 o 3 +3S0 3 (2) [0005] Reduction reaction K 2 SO 4 ·A1 2 (S0 4 ) 3 + 3CO = K 2 SO 4 +A1 2 o 3 + 3S0 2 + 3CO 2 (3) [0006] The method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/76
Inventor 傅培鑫蔡文宽潘同汉
Owner 广西北部湾粮油技术研究有限公司
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