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Method for preparing silicon-potassium-calcium compound fertilizer by using calcium-containing red mud
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A compound fertilizer and red mud technology, applied in the direction of potash fertilizer, calcium fertilizer, application, etc., can solve the problems of increased production cost, crop growth hazards, long production cycle, etc., and achieve the effect of recycling and harmless utilization
Active Publication Date: 2021-07-13
NORTHEASTERN UNIV +1
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[0007] Although the existing methods can also realize the comprehensive utilization of red mud, there are many problems such as complex process, long production cycle, and more raw materials, which lead to increased production costs, and the red mud produced in the production of alumina is relatively alkaline, such as If dealkalization is not carried out, sodiumoxide will also bring harm to the growth of crops
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Embodiment 1
[0033] Process such as figure 1 shown;
[0034] Mix the mixed mother liquor containing potassium metaaluminate and sodium metaaluminate with calcium-containing red mud, and the mixing ratio is 3mL / g according to the liquid-solid ratio to obtain a mixed slurry;
[0035] Calcium-containing red mud contains Al by mass percentage 2 o 3 22.25%, CaO 13.31%, SiO 2 19.58%, Na 2 O6.85%, K 2 O1.82%;
[0036] The potassium hydroxide concentration of the mixed mother liquor containing potassium metaaluminate and sodium metaaluminate is 200g / L;
[0037] The mixed slurry was heated to 210°C, and the leaching reaction was carried out under stirring conditions. The leaching reaction time was 55 minutes, and the leaching material was obtained;
[0038] After the leaching material is flash evaporated, filter solid-liquid separation (filtering method is selected) to obtain transformation liquid and transformation slag; the solid phase in the transformation slag is mainly hydrated potass...
Embodiment 2
[0042] Method is with embodiment 1, and difference is:
[0043] (1) Mix the mother liquor containing potassium metaaluminate with calcium-containing red mud, and the mixing ratio is 4mL / g according to the liquid-solid ratio;
[0044] (2) Potassiumhydroxide concentration 220g / L in the potassium metaaluminate mother liquor;
[0045] (3) Heating the mixed slurry to 230°C for leaching reaction, the leaching reaction time is 30min;
[0049] Method is with embodiment 1, and difference is:
[0050] (1) Mix the mother liquor containing potassium metaaluminate with calcium-containing red mud, and the mixing ratio is 4.5mL / g according to the liquid-solid ratio;
[0051] (2) Potassiumhydroxide concentration 240g / L in the potassium metaaluminate mother liquor;
[0052] (3) Heating the mixed slurry to 260°C for leaching reaction, the leaching reaction time is 10min;
[0054] (5) The recovery rate of alumina is 19.6%, and the recovery rate of sodium oxide is 96%.
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Abstract
A method for preparing a silicon-potassium-calcium compound fertilizer by using calcium-containing red mud comprises the following steps: (1) mixing mother liquor containing potassium metaaluminate with the calcium-containing red mud, or mixing mixed mother liquor containing potassium metaaluminate and sodium metaaluminate with the calcium-containing red mud; (2) heating the mixed slurry to 210-260 DEG C, stirring and leaching; (3) carrying out flash evaporation on the leached material, and then carrying out solid-liquid separation to obtain transformation liquid and transformation slag; and washing and drying the solid phase in the transformation slag which is mainly hydrated potassium aluminosilicate, to prepare the silicon-potassium-calcium compound fertilizer. According to the method disclosed by the invention, a method that the calcium-containing red mud is leached by using the potassium metaaluminate mother liquor is adopted, so that the silicon-potassium-calcium compound fertilizer can be prepared, and harmless utilization of the red mud is realized; part of aluminum oxide and a large amount of sodiumoxide in the red mud can be extracted, and valuable component recovery is achieved.
Description
Technical field: [0001] The invention belongs to the technical field of comprehensive utilization of red mud, in particular to a method for preparing silicon-potassium-calcium compound fertilizer by using calcium-containing red mud. [0002] technical background [0003] Red mud is a solid waste produced during the production of alumina from bauxite. Due to the high alkali content in it and it is difficult to remove, most of the red mud is stored in the form of stockpiling. The comprehensive utilization rate is insufficient, and long-term stockpiling takes up both A large amount of land resources pollute the environment. Analyzing the composition of red mud can reveal that it contains some nutrients needed for crop growth, and red mud has the advantages of good particle distribution and dispersion. It can be considered to make it into fertilizer for crop production to improve its utilization rate. [0004] In recent years, relevant practitioners have carried out a lot of res...
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