CN113117882A - Pre-flotation method for low-grade phosphorite in high sesquioxide - Google Patents
Pre-flotation method for low-grade phosphorite in high sesquioxide Download PDFInfo
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- CN113117882A CN113117882A CN201911390506.7A CN201911390506A CN113117882A CN 113117882 A CN113117882 A CN 113117882A CN 201911390506 A CN201911390506 A CN 201911390506A CN 113117882 A CN113117882 A CN 113117882A
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Abstract
The invention provides a pre-flotation method for low-grade phosphorite in high sesquioxide. By the pre-flotation treatment process, apatite and siliceous gangue minerals can be effectively separated, the grade and recovery rate index of phosphate concentrate are improved, and the method is one of the methods for realizing the efficient utilization of phosphate rock resources. The process flow comprises the following steps: the grinding fineness of the phosphorite is controlled to be 60-85 percent of the content of 200 meshes; adjusting the concentration of the ore pulp to be between 25 and 35 percent, firstly carrying out primary prefloat before formal flotation separation, taking products of the prefloat as tailings, and then carrying out primary coarse flotation and secondary fine flotation to obtain final concentrate P2O5The grade reaches 32.5 to 35.5 percent, and the recovery rate is 80 to 90 percent. The process disclosed by the invention can realize efficient and short-flow flotation of the low-grade phosphorite in the high sesquioxide, improves the comprehensive index of phosphorite sorting, and is low in medicament consumption, high in flotation efficiency, energy-saving and environment-friendly.
Description
Technical Field
The invention belongs to the technical field of mineral processing engineering, relates to a phosphorite pre-flotation method, and particularly relates to a high-sesquioxide medium-low grade phosphorite pre-flotation method.
Background
Phosphorite is an important strategic resource in China, is an important chemical mineral raw material for preparing phosphate fertilizer, producing yellow phosphorus, phosphoric acid and other various phosphorus products, is an important mineral for guaranteeing food safety, is a material basis of fine phosphorus chemical industry, and has important position and function in national economy. The reserves of phosphorite resources in China are relatively rich, and according to the 2016 report of mineral resources in China, the total resource amount of 231.1 million tons is only second to Morocco by the end of 2015 and is located at the 2 nd position in the world. However, the ore mainly comprises medium-low grade sedimentary phosphate rock (collophanite), the rich ore resource is less, the difficulty of mining and selecting is greater, and the phosphorite as a non-renewable resource becomes one of important strategic resources in China.
In the process of mineral separation of phosphorite, the current dominant mineral separation methods include flotation, scrubbing and desliming, roasting-digestion, heavy medium mineral separation, combined mineral separation process, chemical mineral separation, microbial treatment and the like. The flotation process has stronger adaptability compared with other separation methods, and particularly when the phosphorus ore and the gangue are closely symbiotic and have low content, only the flotation method can obtain better separation effect. Most of phosphorite resources in China are treated by a flotation method.
The phosphate ore contains more potassium feldspar, albite, quartz and dolomite, has low grade and high content of sesquioxide, and directly influences the subsequent preparation quality and preparation process of the phosphoric acid. The efficient flotation of the phosphorite is realized by adopting the flotation treatment process, so that the concentrate grade is improved, the recovery rate is increased, the content of sesquioxide is reduced, and the efficient flotation process plays an important role in the subsequent phosphoric acid production process. Therefore, the exploration of the efficient flotation separation process plays an important role in fully utilizing phosphorite resources and improving the production quality of phosphoric acid.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a pre-flotation method for low-grade and medium-grade phosphorite of high sesquioxide, which has the advantages of good process stability, high flotation efficiency, short flotation flow and low medicament consumption, and meets the requirements of an energy-saving, environment-friendly and clean siliceous phosphorite beneficiation process.
In order to achieve the aim, the invention provides a pre-flotation method for low-grade phosphorite in high sesquioxide, which comprises the following steps:
(1) grinding the low-grade phosphorite in the high sesquioxide to the content of 60-85% of 200 meshes, adding water to prepare ore pulp, and adjusting the concentration of the ore pulp to 23-30%; controlling the temperature of ore pulp at 20-35 ℃;
(2) adding a mixed reagent into the ore pulp, mixing for 4min, and then performing pre-flotation for 3min to obtain tailings 1 and pre-flotation concentrate;
(3) adding the pre-flotation concentrate into a mixed reagent, mixing for 4min, and then roughing for 4min to obtain tailings 2 and roughed concentrate;
(4) carrying out concentration I on the rough concentration concentrate, wherein the time for the concentration I is 3min, and obtaining middling 1 and concentrate I;
(5) and (4) carrying out concentration II on the concentrate I, wherein the time of the concentration II is 3min, and obtaining middling 2 and concentrate.
Preferably, P in the high sesquioxide middle and low grade phosphorite2O52.5-26.0 percent of the total content of the sesquioxide, 4-8 percent of the total content of the sesquioxide and 0.6-4.0 percent of the total content of the MgO.
Preferably, in the step (3), the adding amount of the mixed reagent added in the phosphorite roughing is 300.0 g/t-2.7 kg/t.
The ratio of the regulator to the collector is 1: 30-1: 40.
Preferably, in the step (2), the amount of the mixed reagent added in the pre-flotation is 1.0-50.0% of the amount of the crude reagent.
The flotation method provided by the invention is characterized in that the pre-flotation is firstly carried out on the selected raw ore, the concentrate subjected to the pre-flotation is subjected to the process flow of once roughing and twice fine concentration, and no flotation agent is added in the fine concentration process.
After the process flow is selected, P2O5The content reaches 32.5-35.5%, the recovery rate is 80-90%, and the sesquioxide is reduced to one half to one fourth of the original ore.
The invention has the beneficial effects that:
the invention provides a pre-flotation method for middle-low grade phosphorite of high sesquioxide, which is characterized in that a small amount of flotation reagent is added for pre-flotation before phosphorite ore is subjected to normal flotation, the product obtained by flotation is used as tailings, and then a coarse flotation process and a fine flotation process are performed.
The method can effectively treat the low-grade siliceous phosphorite in the high sesquioxide.
2 the invention can effectively reduce the content of sesquioxide and improve the quality of phosphate concentrate after adopting the pre-flotation method.
3, after the pre-flotation treatment is adopted, the flotation process can be shortened, the mineral separation efficiency is improved, and the method is one of new processes for treating the low-grade phosphorite in the high sesquioxide by flotation.
Drawings
FIG. 1 is a process flow diagram of the flotation method provided by the invention
Figure 2 is a flow diagram of a process without the use of pre-flotation.
Figure 3 is a flow chart of a process employing pre-flotation.
Figure 4 is a flow diagram of a process without the use of pre-flotation.
Figure 5 is a flow chart of a process employing pre-flotation.
Detailed Description
The present invention is further illustrated by the following examples, but the embodiments of the present invention are not limited thereto.
The regulator and the collector in the mixed reagent used in the embodiment of the invention are purchased from the science and technology corporation of the Xiangxiang mineral filial piety, the model of the regulator is CJ102, and the model of the collector is G16.
The invention provides a pre-flotation method for low-grade phosphorite in high sesquioxide, which comprises the following steps as shown in figure 1:
(1) grinding the low-grade phosphorite in the high sesquioxide to the content of 60-85% of 200 meshes, adding water to prepare ore pulp, and adjusting the concentration of the ore pulp to 23-30%; controlling the temperature of ore pulp at 20-35 ℃;
(2) adding a mixed reagent into the ore pulp, mixing for 4min, and then performing pre-flotation for 3min to obtain tailings 1 and pre-flotation concentrate (rough flotation feed);
(3) adding the pre-flotation concentrate (rough concentration feed) into a mixed reagent, mixing for 4min, and then performing rough concentration for 4min to obtain tailings 2 and rough concentration concentrate (fine concentration feed I);
(4) subjecting the rougher concentrate (pan I of fine concentration) to fine concentration I for 3min to obtain middling 1 and concentrate (pan II of fine concentration)
(5) And (4) carrying out concentration II on the concentrate I (fed material of the concentration II), wherein the time of the concentration II is 3min, and obtaining middling 2 and concentrate.
Wherein P in the high sesquioxide middle-low grade phosphorite2O52.5-26.0 percent of the total content of the sesquioxide, 4-8 percent of the total content of the sesquioxide and 0.6-4.0 percent of the total content of the MgO.
In the step (3), the adding amount of the mixed reagent added in the phosphorite roughing is 300.0 g/t-2.7 kg/t.
In the step (2), the amount of the mixed reagent added in the pre-flotation is 1.0-50.0% of the amount of the crude reagent.
Example 1
The mass ratio of the regulator CJ102 to the collector G16 in the mixed reagent used for the low-grade phosphorite in a certain high-sesquioxide is 1: 30. The flow without using the pre-flotation is shown in FIG. 2, the dosage of the mixed crude flotation agent is 1600g/t, and the flotation results are shown in Table 1, and the flow with the pre-flotation is shown in FIG. 3, compared with the flow with the pre-flotation, the dosage of the mixed pre-flotation agent is 500g/t, the dosage of the mixed crude flotation agent is 1100g/t, and the flotation results are shown in Table 2.
TABLE 1 test results without Pre-flotation
TABLE 2 results of the pre-flotation test
As can be seen from the test results in tables 1 and 2, the grade of the phosphate concentrate is improved by 1.5% under the condition that the recovery rate is not greatly different by adopting the process flow of pre-flotation rather than pre-flotation; in addition, although the total yield of the tailings in the pre-flotation process is large, the total grade is reduced by 1 percent. Proves that the adoption of the pre-flotation process flow is beneficial to the separation of apatite and gangue minerals in siliceous phosphorite.
Example 2
The mass ratio of the regulator CJ102 to the collector G16 in the mixed reagent used for the low-grade phosphorite in a certain high-sesquioxide is 1: 30. The flow without using the pre-flotation is shown in FIG. 4, the dosage of the mixed rougher flotation agent is 1800g/t, and the flotation results are shown in Table 3, while the flow with the pre-flotation is shown in FIG. 5, comparing the dosage of the mixed rougher flotation agent with 390g/t, and the dosage of the rougher flotation agent with 1400g/t, and the flotation results are shown in Table 4.
TABLE 3 test results without pre-flotation
TABLE 4 results of the pre-flotation test
As can be seen from the test results in tables 3 and 4, the process flow of pre-flotation rather than pre-flotation is adopted, the grade of the phosphate concentrate is improved by about 2.5%, and the recovery rate is improved by 6%; meanwhile, the total yield and grade of the tailings obtained by adopting the pre-flotation process are reduced. The method proves that the pre-flotation process is firstly adopted, so that the separation of apatite and gangue minerals in siliceous phosphorite is facilitated, and the separation effect of the low-grade phosphorite in the high sesquioxide is improved.
In conclusion, the novel pre-flotation process disclosed by the invention shortens the subsequent conventional flotation process, improves the efficiency of phosphorite flotation and finally obtains the concentrate P2O5The grade reaches 32.5 to 35.5 percent, the recovery rate reaches 80 to 90 percent, the continuous and stable production can be realized, and the comprehensive index of the low-grade phosphorite in the high sesquioxide is improved. The pretreatment process can improve the grade of the phosphorite, reduce the content of the sesquioxide, has short flow and high efficiency, and is one of the methods for improving the utilization rate of the phosphorus resources.
Although the present invention has been described above, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit of the present invention, which falls within the protection of the present invention.
Claims (5)
1. The pre-flotation method for the low-grade phosphorite in the high sesquioxide is characterized by comprising the following steps of:
(1) grinding the low-grade phosphorite in the high sesquioxide to the content of 60-85% of 200 meshes, adding water to prepare ore pulp, and adjusting the concentration of the ore pulp to 23-30%; controlling the temperature of ore pulp at 20-35 ℃;
(2) adding a mixed reagent into the ore pulp, mixing for 4min, and then performing pre-flotation for 3min to obtain tailings 1 and pre-flotation concentrate;
(3) adding the pre-flotation concentrate into a mixed reagent, mixing for 4min, and then roughing for 4min to obtain tailings 2 and roughed concentrate;
(4) carrying out concentration I on the rough concentration concentrate, wherein the time for the concentration I is 3min, and obtaining middling 1 and concentrate I;
(5) and (4) carrying out concentration II on the concentrate I, wherein the time of the concentration II is 3min, and obtaining middling 2 and concentrate.
2. The pre-flotation method for the middle and low grade phosphorus ore with high sesquioxide as claimed in claim 1, wherein P in the middle and low grade phosphorus ore with high sesquioxide is P2O52.5-26.0 percent of the total content of the sesquioxide, 4-8 percent of the total content of the sesquioxide and 0.6-4.0 percent of the total content of the MgO.
3. The pre-flotation method for the low-grade phosphorite in the high sesquioxide as claimed in claim 1, wherein the mixed reagent is a mixture of a regulator and a collector, and the mass ratio of the regulator to the collector is 1: 30-1: 40.
4. The pre-flotation method for the middle and low grade phosphorite in the high sesquioxide as set forth in claim 1, wherein in the step (3), the mixed reagent added in the phosphorite roughing is 300.0 g/t-2.7 kg/t.
5. The method for pre-flotation of low-grade phosphorus ore in high sesquioxide according to claim 3, wherein in the step (2), the amount of the mixed reagent added in the pre-flotation is 1.0-50.0% of the amount of the crude reagent.
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Citations (4)
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|---|---|---|---|---|
| US4904375A (en) * | 1986-05-16 | 1990-02-27 | Imc Fertilizer, Inc. | Sodium silicate as a phosphate flotation modifier |
| CN107497606A (en) * | 2017-09-13 | 2017-12-22 | 化工部长沙设计研究院 | A kind of regime of agent of phosphorus ore direct flotation roughing |
| CN109954579A (en) * | 2019-03-29 | 2019-07-02 | 中冶北方（大连）工程技术有限公司 | Two product ore-dressing technique of apatite ilmenite |
| CN110293006A (en) * | 2019-07-19 | 2019-10-01 | 宜都兴发化工有限公司 | The beneficiation method of sesquichloride in a kind of reduction collophane |
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2019
- 2019-12-30 CN CN201911390506.7A patent/CN113117882B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4904375A (en) * | 1986-05-16 | 1990-02-27 | Imc Fertilizer, Inc. | Sodium silicate as a phosphate flotation modifier |
| CN107497606A (en) * | 2017-09-13 | 2017-12-22 | 化工部长沙设计研究院 | A kind of regime of agent of phosphorus ore direct flotation roughing |
| CN109954579A (en) * | 2019-03-29 | 2019-07-02 | 中冶北方（大连）工程技术有限公司 | Two product ore-dressing technique of apatite ilmenite |
| CN110293006A (en) * | 2019-07-19 | 2019-10-01 | 宜都兴发化工有限公司 | The beneficiation method of sesquichloride in a kind of reduction collophane |
Non-Patent Citations (3)
| Title |
|---|
| 曾理等: "贵州某硅钙质磷矿岩的浮选试验研究", 《矿产保护与利用》 * |
| 纪丽凡: "新浦磷矿浮选药剂及常温浮选研究", 《化工矿物与加工》 * |
| 袁俊宏等: "我国沉积型条带状磷块岩分布特点及选矿技术", 《武汉工程大学学报》 * |
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