Method for preparing high-quality citrate-soluble silicon fertilizer from amorphous silicon dioxide

A technology of silicon dioxide and citric acid soluble silicon, applied in inorganic fertilizers, calcium fertilizers, fertilization devices, etc., can solve the problems of aggravating the toxicity of aluminum to plants, and achieve the effect of easy-to-obtain raw materials and simple processes

Inactive Publication Date: 2016-12-07
贵州鑫亚矿业有限公司 +1
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  • Abstract
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Problems solved by technology

Industrial solid waste and mineral raw materials often contain high alumina. During the activation process, alumina will transform into toxic and soluble forms, especially in acidic soils, which will aggravate the toxicity of aluminum to plants. In addition, with It is difficult to avoid harmful elements such as heavy metals exceeding the standard when industrial waste is used as raw material

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  • Method for preparing high-quality citrate-soluble silicon fertilizer from amorphous silicon dioxide

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Embodiment 1

[0032] Guizhou Qinglong anatase containing TiO 2 4.00%~6.00%, including Sc 2 o 3 60g / t~120g / t. TiO 2 It mainly exists in the form of independent mineral anatase, and no independent mineral of scandium is found in the ore. Scandium element mainly occurs in clay minerals such as kaolinite and sericite, and secondly occurs in limonite and anatase. Metal minerals in raw ore mainly include anatase, limonite, and a small amount of ilmenite, magnetite, galena, pyrite, etc.; gangue minerals mainly include kaolinite, followed by quartz, silk (white ) mica, chlorite, plagioclase, zircon, etc. Technological mineralogy research shows that titanium is mainly produced in the form of fine-grained anatase wrapped in silicate and quartz, with extremely fine particle size, and secondly occurs in limonite in the form of isomorphism, which belongs to Very difficult to select ore. Such as figure 1 As shown, the ore is leached with two-stage sulfuric acid, and scandium oxide, titanium dioxi...

Embodiment 2

[0034] A high-iron bauxite mine in Yunnan, the raw ore contains Al 2 o 3 42.13%, SiO 2 15.73%, TiO 2 3.89%, with higher content of associated iron and titanium. There are oxides, carbonates, silicates, and a small amount of sulfides in the ore. There are more than 10 kinds of minerals in four categories, of which oxides account for 66.75% and silicates account for 31.64%. Among them, aluminum minerals are mainly diaspore, iron minerals are mainly limonite, goethite, specularite, ilmenite, etc., titanium minerals are ilmenite and anatase, etc., and gangue minerals are mainly Clay, kaolinite, chlorite, pyrophyllite, illite, muscovite, calcite and organic matter, etc. Aluminum minerals are mostly in the form of plates, flakes, and semi-euhedral-other-shaped granular crystals, often mixed with limonite, hematite, kaolinite, anatase and other components to form oolites or mutually wrapped and contiguous , or impregnated with fine particles of limonite and hematite, with a p...

Embodiment 3

[0036] The chemical composition of a coal gangue in Guizhou is SiO 2 43.34%, Al 2 o 3 34.60%, Fe 2 o 3 5.82%, CaO 0.95%. Such as figure 1 As shown, sulfuric acid leaching is used to recover aluminum, and the leaching slag contains SiO 2 76.97%, Al 2 o 3 0.23%, Fe 2 o 3 0.14%, TiO 2 0.75%, CaO 0.024%, MgO 0.016%, K 2 O 0.012%, Na 2 O 0.02%, loss on ignition 20.65%, average particle size 540 nanometers of amorphous silica, the amorphous silica mixed with limestone (crushed and ground to -200 mesh ≥ 80%) and sodium hydroxide for granulation , the ratio of silicon to calcium is 1:0.9 (molar ratio), the amount of sodium hydroxide is 14% (mass fraction), the diameter of the green ball is 12 mm, put it into the rotary kiln and roast at 1000 °C for 1 h, after roasting, grind the powder, the fineness In order to pass 250 µm standard sieve ≥80%, effective silicon (SiO 2 ) content of 30.54%, effective calcium (CaO) content of 31.3%, moisture content of 0.2%, As 0.000...

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Abstract

The invention discloses a method for preparing a high-quality citrate-soluble silicon fertilizer from amorphous silicon dioxide. The amorphous silicon dioxide (the raw material can be higher-purity silicon dioxide slag or diatomite obtained in the comprehensive utilization process of acid-leached kaolin, fly ash, illite, pyrauxite and other minerals) reacts with alkalis (mainly sodium hydroxide and potassium hydroxide) and a high calcium oxide raw material (the raw material can be different combinations of limestone, dolomite, calcite, lime and several other raw materials) under high-temperature roasting conditions to generate effective silicon which is soluble in plant-secreted organic acids and can be conveniently absorbed by the crops. The contents of heavy metal ions and harmful impurities in the raw materials can be strictly controlled, and the silicon-calcium ratio and alkali consumption in the raw materials can be changed to obtain different grades of the high-quality citrate-soluble silicon fertilizer with the effective SiO2 content of 20-40%. The method has the characteristics of simple technical process, wide raw material sources, low production cost, no environmental pollution and the like.

Description

technical field [0001] The invention relates to the technical field of mineral processing engineering, in particular to a method for preparing high-quality citrate-soluble silicon fertilizer from amorphous silicon dioxide. Background technique [0002] Silicon fertilizer has been recognized as the fourth growth element fertilizer after nitrogen, phosphorus and potassium fertilizer by the international soil science community. It can promote the transportation of nitrogen and phosphorus from stems and leaves to seeds; crops have different requirements for nutrients at different growth stages, and silicon fertilizer can balance the absorption of nitrogen, phosphorus, potassium and other elements by crops. Silicon fertilizer is also a health fertilizer, which can effectively passivate heavy metals, reduce soil heavy metal pollution, and improve soil base. In addition, the application of silicon fertilizer can effectively improve the soil environment while supplying the medium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D11/00
CPCC05D3/02C05D9/00
Inventor 高利坤洪志董方
Owner 贵州鑫亚矿业有限公司
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