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Red mud-silico-calcium-potash fertilizer and preparation method thereof

A technology of red mud and silicon-calcium, which is applied to potash fertilizers, calcium fertilizers, inorganic fertilizers, etc., can solve problems such as failure to achieve expected results and low effective silicon content, and save drying processes and costs, reduce production costs, and save The effect of cost expenditure

Active Publication Date: 2019-01-04
中国有色桂林矿产地质研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been tests of using red mud and fly ash as silicon fertilizer respectively, the test did not achieve the expected results. The reason is that most of the silicon in red mud and fly ash is glassy and mineral silicon, which can The effective silicon content absorbed by plants is very small, such as SiO in fly ash 2 As high as 50% to 60%, but the effective silicon that can be absorbed by plants is only 1% to 2%

Method used

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  • Red mud-silico-calcium-potash fertilizer and preparation method thereof
  • Red mud-silico-calcium-potash fertilizer and preparation method thereof
  • Red mud-silico-calcium-potash fertilizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] 1) Weigh red mud, fly ash and desulfurization slag according to the mass percentage of 27%: 53%: 20%, and mix them uniformly to obtain a mixture;

[0043] 2) Take by weighing potassium hydroxide equivalent to 8% of the mass of the mixture, dissolve it in water equivalent to 20% of the quality of the mixture, add the potassium hydroxide solution to the mixture obtained in step 1), mix evenly, and carry out the Granulating (the grain that makes is cylindrical, and thickness is 3mm, and diameter is 1cm), obtains granular material;

[0044] 3) The obtained pellets are placed in dry powder ((composed of red mud, fly ash and desulfurization slag at a mass percentage of 27%: 53%: 20%)) to allow the pellets to fully contact with the dry powder, so that the surface of the pellets is wrapped with a Layer dry powder to obtain granules after powder makeup;

[0045] 4) The obtained powdered granular material is placed in a porcelain crucible and then roasted in a muffle furnace. Th...

Embodiment 2

[0050] 1) Weigh red mud, fly ash and desulfurization slag according to the mass percentage of 25%: 50%: 25%, and mix them uniformly to obtain a mixture;

[0051] 2) Take by weighing potassium hydroxide equivalent to 15% of the mass of the mixture, dissolve it in water equivalent to 20% of the quality of the mixture, add the potassium hydroxide solution to the mixture obtained in step 1), mix evenly, and carry out the Granulating (the grain that makes is cylindrical, and thickness is 3mm, and diameter is 1cm), obtains granular material;

[0052] 3) The obtained granules are placed in dry powder (fly ash) so that the granules are in full contact with the dry powder, so that the surface of the granules is coated with a layer of dry powder, and the powdered granules are obtained;

[0053] 4) The obtained powdered granular material is placed in a porcelain crucible and then roasted in a muffle furnace. The maximum furnace temperature is set to 600°C. After reaching 600°C, it is kep...

Embodiment 3

[0058] 1) Weigh red mud, fly ash and desulfurization slag according to the mass percentage of 25%: 50%: 25%, and mix them uniformly to obtain a mixture;

[0059] 2) Take by weighing potassium hydroxide equivalent to 20% of the mass of the mixture, dissolve it in water equivalent to 20% of the quality of the mixture, add the potassium hydroxide solution to the mixture obtained in step 1), mix evenly, and place the obtained material Carry out granulation in granulator (the granulation that makes is cylindrical, and thickness is 3mm, and diameter is 1cm), obtains granulate;

[0060] 3) The obtained granules are placed in dry powder (fly ash) so that the granules are in full contact with the dry powder, so that the surface of the granules is coated with a layer of dry powder, and the powdered granules are obtained;

[0061] 4) The powdered granular material obtained is placed in a porcelain crucible and then roasted in a muffle furnace. The maximum furnace temperature is set to 70...

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Abstract

The invention discloses a red mud-silico-calcium-potash fertilizer and a preparation method thereof. The preparation method comprises the following steps: 1) weighing 20-50wt% of red mud, 30-60wt% offly ash and 5-30wt% of desulfurization slag, and mixing uniformly to obtain a mixed material; 2) weighing potassium hydroxide equivalent to 2-30% of the mass of the mixed material, preparing to a solution with water as a solvent, adding the solution to the mixed material, mixing uniformly, and granulating to obtain a granulated material; 3) placing the obtained granulated material in dry powder tofully contact, and wrapping the surface of the granulated material with a layer of dry powder to obtain powder-coated powder material; and 4) calcining the obtained powder-coated powder material at 450 DEG C or above, and cooling after calcining, so as to obtain the fertilizer. The method disclosed in the invention is simple, easy to control, and low in cost, and the obtained fertilizer is low incontent of free sodium and high in content of insoluble or slightly soluble silicon.

Description

technical field [0001] The invention relates to a red mud silicon-calcium-potassium fertilizer and a preparation method thereof, belonging to the field of comprehensive utilization of solid waste. Background technique [0002] Aluminum metal is widely used for its light weight, good electrical and thermal conductivity, high reflectivity and oxidation resistance. Its output is second only to steel and occupies the first place in the output of non-ferrous metals. The output of alumina as a raw material for aluminum metal has been constantly hitting new highs in recent years. According to Moshang.com, since 2018, the global average daily output of alumina has been around 330,000 tons, of which my country's alumina output in April 2018 reached 5.9 million tons , ranking first in the world. [0003] Red mud, so named because it looks like red clay. Alumina production enterprises commonly use Bayer method, sintering method or combined method to produce alumina, but no matter whic...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/80
CPCC05D1/00C05G3/80C05D3/04C05D9/00
Inventor 张健伟甘可冷杰彬
Owner 中国有色桂林矿产地质研究院有限公司
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