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Saline-alkali soil improver and method for preparing saline-alkali soil improver by using phosphate rock tailings and low-rank coal

A technology for phosphate rock tailings and saline-alkali soil, applied in the chemical industry, can solve problems such as difficulty in promotion, untargeted addition of microorganisms, soil compaction, etc.

Active Publication Date: 2021-09-03
SINOCHEM AGRI LINYI R&D CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned technologies have a certain effect on the improvement of saline-alkali soil, but they are all one-sided and cannot fully solve several common problems in saline-alkali soil: high pH value, high salinity, low utilization rate of trace elements such as calcium, magnesium and zinc, and phosphorus utilization. Low rate, low soil organic matter, soil compaction, etc.
Moreover, the raw materials used in the prior art, such as humic acid, solid acid, organic acid, etc., have high costs, and some raw materials, such as vermicompost, fermented liquid, etc., have unstable sources and are difficult to be widely promoted.
However, the humic acid used in most technologies has not been activated, and the utilization rate and effect are poor.
At the same time, most technologies do not fully understand the role of root microorganisms, or the addition of microorganisms is not targeted
[0004] Therefore, existing ameliorants suitable for saline-alkali soil need to be studied

Method used

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  • Saline-alkali soil improver and method for preparing saline-alkali soil improver by using phosphate rock tailings and low-rank coal
  • Saline-alkali soil improver and method for preparing saline-alkali soil improver by using phosphate rock tailings and low-rank coal
  • Saline-alkali soil improver and method for preparing saline-alkali soil improver by using phosphate rock tailings and low-rank coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Raw material: phosphate rock tailings, collection location: Sinochem Yunlong Co., Ltd.

[0051] The chemical composition of the phosphorite tailings in the present embodiment is shown in the following table 1;

[0052]Table 1 Chemical composition of phosphate rock tailings

[0053]

[0054] Raw material: lignite, collection location: Yunnan Gold Institute

[0055] The chemical composition of the present embodiment lignite is shown in the following table 2;

[0056] Table 2 Chemical composition of lignite

[0057]

[0058] Raw materials: 98% sulfuric acid, purchased from the market

[0059] Raw materials: 60% nitric acid, purchased from the market

[0060] Raw materials: trace elements, boric acid (purity 99%), zinc oxide (purity 99%), ferrous oxide (purity 99%), manganese dioxide (purity 60%), purchased from the market

[0061] Raw materials: Bacillus subtilis 200 billion / g, Bacillus megaterium 100 billion / g and Aspergillus niger 10 billion / g, purchased from ...

Embodiment 2

[0069] Raw material: phosphate rock tailings, same as embodiment 1

[0070] Raw material: lignite, with embodiment 1

[0071] Raw material: sulfuric acid, with embodiment 1

[0072] Raw material: 40wt% nitric acid, market purchase

[0073] Raw material: trace element, with embodiment 1

[0074] Raw materials: bacteria agent Bacillus megaterium 100 billion / g and Aspergillus niger 10 billion / g, purchased from the market

[0075] Preparation:

[0076] Phosphate tailings and sulfuric acid (with 98% H 2 SO 4 ) and water in a mass ratio of 1:1.1:0.4, and reacted and matured in a closed curing silo at a curing temperature of 90°C for 3 days to obtain a powdery material; the lignite was wet-milled to 20 mesh , the water content of the coal slurry is 80%, lignite slurry (on a dry basis) and nitric acid (40% HNO 3 According to the mass ratio of 1:0.5, the oxidative nitration reaction is carried out in a closed reaction kettle, the reaction temperature is 90 ° C, the reaction time...

Embodiment 3

[0082] Raw material: phosphate rock tailings, same as embodiment 1

[0083] Raw material: lignite, with embodiment 1

[0084] Raw material: sulfuric acid, with embodiment 1

[0085] Raw material: 70wt% nitric acid, market purchase

[0086] Raw materials: trace elements, zinc sulfate (purity 99%), boric acid (purity 99%)

[0087] Raw materials: bacteria agent Bacillus amyloliquefaciens 100 billion / g, Bacillus megaterium 100 billion / g, purchased from the market

[0088] Preparation:

[0089] Phosphate tailings and sulfuric acid (with 98% H 2 SO 4 ) and water in a mass ratio of 1:0.5:0.1, and reacted and matured in a closed curing silo at a temperature of 30°C and a curing time of 30 days to obtain a powdery material; the lignite was wet-milled to 100 mesh , the water content of coal slurry is 30%, lignite slurry (on dry basis) and nitric acid (70% HNO 3 According to the mass ratio of 1:0.7, the oxidative nitration reaction is carried out in a closed reaction kettle, the r...

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Abstract

The invention discloses a saline-alkali soil improver and a method for preparing the saline-alkali soil improver by using phosphate ore tailings and low-rank coal. The method comprises: (1) mixing the phosphate ore tailings with concentrated sulfuric acid and water for slaking to obtain powder (2) Mix the wet-milled coal slurry of low-rank coal with nitric acid for oxidative nitration reaction, and mix and stir the obtained reaction material with medium and trace elements to obtain a mixed slurry; (3) mix the powdery material It is mixed with the mixed slurry for granulation, and ammonia is introduced at the same time to obtain granular materials; (4) the bacterium is sprayed on the granular materials to obtain a saline-alkali soil improver. This method can not only realize the comprehensive utilization of low-rank coal and phosphate rock tailings, but also keep the saline-alkali soil conditioner slightly acidic, neutralize the alkaline substances in saline-alkali soil, reduce the pH value of saline-alkali soil, and at the same time, it contains Calcium ions can reduce the stress of sodium ions in saline-alkali soil, and in addition, under slightly acidic conditions, it can maintain the activity of phosphorus in the amendment and reduce the fixation of phosphorus by the soil.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a saline-alkali soil improver and a method for preparing the saline-alkali soil improver by utilizing phosphate rock tailings and low-rank coal. Background technique [0002] At present, there are many studies on the improvement of saline-alkali soil. For example, in the prior art, desulfurization gypsum, humic acid, magnesium sulfate, water-soluble polymers and solid acids are evenly mixed to obtain a soil conditioner; Minerals, citric acid, and polymaleic acid are stirred and mixed to prepare a soil conditioner for strong acid saline-alkali land; another example is made of urea phosphate, potassium fulvic acid, γ-polyglutamic acid fermentation broth, calcium nitrate, and glutaxanthin , Alkyl polyglucoside, water-soluble defoaming agent and water-preparing improver; there is also a saline-alkali soil improver prepared from chemical fertilizers, vermicompost, humic ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K101/00C09K109/00
CPCC09K17/40C09K2101/00C09K2109/00
Inventor 张西兴马跃王子浩周海燕庞世花孙鹰翔
Owner SINOCHEM AGRI LINYI R&D CENT CO LTD
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