CN109020629B - Process for producing silicon-calcium-magnesium-potassium fertilizer by using asbestos tailings - Google Patents
Process for producing silicon-calcium-magnesium-potassium fertilizer by using asbestos tailings Download PDFInfo
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- CN109020629B CN109020629B CN201811033507.1A CN201811033507A CN109020629B CN 109020629 B CN109020629 B CN 109020629B CN 201811033507 A CN201811033507 A CN 201811033507A CN 109020629 B CN109020629 B CN 109020629B
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
- C05D1/02—Manufacture from potassium chloride or sulfate or double or mixed salts thereof
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Abstract
The invention discloses a process for producing a silicon-calcium-magnesium-potassium fertilizer by using asbestos tailings, which comprises the steps of crushing a serpentine raw material to about 3cm by using a cone crusher, adding the crushed serpentine raw material into a ball mill for ball milling for 30-40 min, and controlling the granularity of the serpentine to about 250 meshes; adding KCl particles into the ball mill in an amount which is one ninth of the mass of the serpentine, and continuing the ball milling operation for 30 min; when the granularity of the material in the ball mill is larger than 300 meshes, starting discharging, and discharging to a winnowing machine; the winnowing machine winnows the powder under the pressure of 6 kg; the materials which pass through the air separation are directly packaged and used as fertilizer powder or used as raw materials of the fertilizer, the materials which do not pass through the air separation are discharged from the rotary drum and then used as metallurgical raw materials. The method can perform harmless treatment on the asbestos tailings, change waste into valuable, and reduce environmental hazards.
Description
Technical Field
The invention relates to a process for producing a silicon-calcium-magnesium-potassium fertilizer by using asbestos tailings.
Background
Asbestos is an important mineral raw material in the national economic construction process. Asbestos is produced in serpentine mineral belt, and 40 tons of tailing waste serpentine are produced every one ton of asbestos. The asbestos tailings are typical dangerous wastes because of being rich in heavy metals such as Cr, nickel, cobalt, copper, iron and the like, and are serious in harm to the environment and animals and plants, and the components of the asbestos tailings which are originally produced in Aljinshan and Kunlun mountain in Xinjiang Ruqiang county are shown in the following table:
from the above table, serpentine is a hydrous silicate mineral of magnesium. The chemical composition of the material is 3 MgO.2SiO2·2H2O or MgO [ Si ]4O10](OH)8And the asbestos tailings have high heavy metal content and great harm to soil.
On page 936 of "atlas of steelmaking data" compiled by Zhaoyou in reference (1) there are: the expression "serpentine is capable of producing fertilizers and refractory materials"; (2) the specification of NY1110-2010, the Cr and Pb contents in the fertilizer are lower than 50ppm, the As and Cd contents are lower than 10ppm, and the Hg is lower than the specification requirement of 5 ppm; (3) in the middle of a paper entitled "the current situation and development trend of serpentine mineral" published in journal 2007 hydrometallurgy by Yangwang, Carhui et al, the following is expressed: the enterprises for producing calcium magnesium phosphate fertilizer by using serpentine as a raw material at present mainly comprise Guangxi phosphate fertilizer plants, Yunnan phosphate fertilizer plants, Jiangsu east-sea phosphate fertilizer plants and the like. The production process adopts a melting process'.
According to the above description, there is no description about removing harmful element Cr from soil in the production process of chemical fertilizer by using serpentine, and there is no description about the process of producing fertilizer by using serpentine as main raw material by using mechanochemical reaction principle.
Disclosure of Invention
The invention aims to provide a process for producing a silicon-calcium-magnesium-potassium fertilizer by using asbestos tailings, which can perform harmless treatment on the asbestos tailings, change waste into valuable and reduce environmental hazards.
The invention aims to realize the process for producing the silicon-calcium-magnesium-potassium fertilizer by using the asbestos tailings, wherein a serpentine raw material is firstly crushed to about 3cm by using a cone crusher and then added into a ball mill for ball milling, the ball milling time is 30-40 min, and the granularity of the serpentine is controlled to about 250 meshes; adding KCl particles into the ball mill in an amount which is one ninth of the mass of the serpentine, and continuing the ball milling operation for 30 min; when the granularity of the material in the ball mill is larger than 300 meshes, starting discharging, and discharging to a winnowing machine; the winnowing machine winnows the powder under the pressure of 6 kg; the materials which pass through the air separation are directly packaged and used as fertilizer powder or used as raw materials of the fertilizer, the materials which do not pass through the air separation are discharged from the rotary drum and then used as metallurgical raw materials.
The inventor of the present invention has found that, when dealing with serpentine raw material which is Yindoubaucan, Qiang county, Xinjiang, because serpentine is rich in oxides of elements such as Cr, Ni, Co, Fe, etc., and the above various minerals have a double-layer structure in which one layer of silicon-oxygen tetrahedron is combined with one layer of magnesium hydroxide octahedron, and sometimes a small amount of FeO or Fe is mixed in the serpentine raw material2O3、NiO、CoO、Cr2O3And the like. In which the magnesium hydroxide is structurally intermediate Mg2+Of Cr is coated with3+、Ni2+、Co2+And the like. Due to the structure, the difficulty of removing heavy metal harmful elements in the fertilizer is high when the fertilizer is produced, and the fertilizer must be produced by a melting method. But the process cost of producing the fertilizer by the melting method is higher, the flow is longer, and the harm to the environment is larger.
The inventor finds that the structure of the serpentine utilizes the mineral structure characteristics of the serpentine, adopts the mechanochemical reaction principle, can utilize the ball mill to be matched with the winnowing process, can separate the harmful element Cr in the serpentine, and SiO in the middle of the serpentine under the action of the mechanochemical reaction2、Mg（OH）2The plant can absorb citrate soluble oxide, and is a technological process for producing Si-Ca-Mg-K fertilizer by using mechanochemical reaction principle.
The technical principle of the invention is as follows:
the technical principle of the invention is based on the following 4 innovation points:
(1) after serpentine is crushed by using a ball mill, the serpentine is ball-milled to 250-450 meshes under the action of the ball mill by using the mechanical force chemical reaction principle, and the mechanical energy of the ball mill changes SiO in the middle of the serpentine2The crystal structure of (a), so that a tetrahedral structure capable of being absorbed by plants is provided;
(2) when the serpentine is ground to 250-300 meshes by the ball mill, KCl particles with the proportion of 10% are added into the ball mill, ball milling is continued for 20min, the granularity is controlled to be 300-450 meshes, and at the stage, the KCl reacts with hydroxides in the powder by utilizing a mechanochemical reaction principle, so that part of heavy metal oxides in the KCl are converted into chlorides, meanwhile, the decomposition reaction of carbonate is realized, and MgO is converted into a structure with citrate solubility;
(3) discharging the materials from the ball mill into the air separator after the operation is finished. Wherein the pressure and air volume of the winnowing machine are determined according to Bernoulli equation and MgO, SiO2Determining the specific gravity of the raw materials; the core innovation point is based on the conversion of heavy metalsThe specific gravity of the compound is larger than that of the silicon-calcium-magnesium-potassium compound.
(4) After air separation, the material which has larger specific gravity and does not pass through air separation is used as a metallurgical raw material, and the material after air separation enters a storage bin to be packaged and used as a fertilizer or a raw material of the fertilizer.
The method has reasonable steps, can perform harmless treatment on the asbestos tailings, changes waste into valuable, and reduces the environmental hazard.
Detailed Description
Taking the actual production of Yidongchun Tokyo in Xinjiang Ruoqiang county as an example:
a process for producing a silicon-calcium-magnesium-potassium fertilizer by using asbestos tailings comprises the following steps:
1) crushing a serpentine raw material to about 3cm by using a cone crusher, adding the crushed serpentine raw material into a ball mill for ball milling for 30-40 min, and controlling the granularity of the serpentine to about 250 meshes;
2) adding KCl particles into the ball mill in an amount which is one ninth of the mass of the serpentine, and continuing the ball milling operation for 30 min;
3) when the granularity of the material in the ball mill is larger than 300 meshes, starting discharging, and discharging to a winnowing machine;
4) the winnowing machine winnows the powder under the pressure of 6 kg;
5) the materials which pass through the air separation are directly packaged and used as fertilizer powder or used as raw materials of the fertilizer, the materials which do not pass through the air separation are discharged from the rotary drum and then used as metallurgical raw materials.
Claims (1)
1. A process for producing a silicon-calcium-magnesium-potassium fertilizer by using asbestos tailings is characterized by comprising the following steps: crushing a serpentine raw material to about 3cm by using a cone crusher, adding the crushed serpentine raw material into a ball mill for ball milling for 30-40 min, and controlling the granularity of the serpentine to be 250 meshes; adding KCl particles into the ball mill in an amount which is one ninth of the mass of the serpentine, and continuing the ball milling operation for 30 min; when the granularity of the material in the ball mill is larger than 300 meshes, starting discharging, and discharging to a winnowing machine; the winnowing machine winnows the powder under the pressure of 6 kg; the materials which pass through the air separation are directly packaged and used as fertilizer powder or used as raw materials of the fertilizer, the materials which do not pass through the air separation are discharged from the rotary drum and then used as metallurgical raw materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811033507.1A CN109020629B (en) | 2018-09-05 | 2018-09-05 | Process for producing silicon-calcium-magnesium-potassium fertilizer by using asbestos tailings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811033507.1A CN109020629B (en) | 2018-09-05 | 2018-09-05 | Process for producing silicon-calcium-magnesium-potassium fertilizer by using asbestos tailings |
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| Publication Number | Publication Date |
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| CN109020629A CN109020629A (en) | 2018-12-18 |
| CN109020629B true CN109020629B (en) | 2021-04-30 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112176132B (en) * | 2020-09-25 | 2022-06-21 | 新疆互力佳源环保科技有限公司 | Resource utilization process for utilizing steelmaking production in cooperation with waste asbestos |
| CN114380626A (en) * | 2021-06-10 | 2022-04-22 | 若羌县圣地石棉尾料再利用科技开发有限公司 | Preparation method for extracting medium-trace element fertilizer by using asbestos tailings |
| CN114716269B (en) * | 2022-03-31 | 2023-11-10 | 华南理工大学 | Method for preparing citrate-soluble fertilizer by roasting and detoxication/activation of asbestos tailings or ferronickel slag |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500455A (en) * | 2011-12-21 | 2012-06-20 | 湖北工业大学 | Tailing efficient recovery treatment method |
| CN102921535A (en) * | 2012-11-07 | 2013-02-13 | 牛庆君 | Method for recycling gold from serpentine asbestos rock type asbestos tailings |
| CN103172409A (en) * | 2011-12-22 | 2013-06-26 | 清华大学 | Process for preparing non-soluble potassium fertilizer by using potassium-bearing minerals |
| CN104232899A (en) * | 2014-08-21 | 2014-12-24 | 同济大学 | Method for separating and enriching zinc and lead from heavy metal-polluted construction waste |
| RU2579201C1 (en) * | 2014-10-20 | 2016-04-10 | Андрей Рудольфович Предтеченский | Method of producing potassium humate and facility |
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2018
- 2018-09-05 CN CN201811033507.1A patent/CN109020629B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500455A (en) * | 2011-12-21 | 2012-06-20 | 湖北工业大学 | Tailing efficient recovery treatment method |
| CN103172409A (en) * | 2011-12-22 | 2013-06-26 | 清华大学 | Process for preparing non-soluble potassium fertilizer by using potassium-bearing minerals |
| CN102921535A (en) * | 2012-11-07 | 2013-02-13 | 牛庆君 | Method for recycling gold from serpentine asbestos rock type asbestos tailings |
| CN104232899A (en) * | 2014-08-21 | 2014-12-24 | 同济大学 | Method for separating and enriching zinc and lead from heavy metal-polluted construction waste |
| RU2579201C1 (en) * | 2014-10-20 | 2016-04-10 | Андрей Рудольфович Предтеченский | Method of producing potassium humate and facility |
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