Method for producing powdered rock phosphate pellets by using low-grade powdered rock phosphate

A technology for phosphate rock powder and powder pellets, applied in the field of phosphorus chemical industry, can solve the problems of insufficient hardness and heat resistance of pellets, unbalanced pH in the furnace, and difficulty in recycling ore powder, and achieves the strength and thermal stability of pellets. The effect of high performance, improved utilization, and improved self-strength

Active Publication Date: 2021-04-02
云南省宣威东升化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the currently commonly used binders, when bentonite, humic acid, clay and water glass are used as binders, the grade of phosphate rock powder pellets will decrease, the amount of slag will increase, and the hardness and heat resistance of the pellets will not be sufficient. , easy to burst, resulting in unstable reaction in the furnace, difficulty in recycling mineral powder, and low benefit; when silicate is used as a binder, excessive silicate will cause an imbalance of pH in the furnace and affect the control of the electric furnace; When organic composite binders are used, there are also problems such as low thermal strength, inconvenient operation, and high powder return rate.
Using the pellet method to prepare ore powder into pellets for the production of yellow phosphorus can not only realize the utilization of low-grade phosphate rock powder, but also solve the problem of shortage of ore sources for yellow phosphorus production. However, due to failure to obtain the optimal The formulation and processing method of the pellet adhesive seriously restrict the popularization and application of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]After sieving the phosphate rock powder, according to the following mass ratio, add 1-10 mass parts of phosphoric acid and 0.5-2 mass parts of silicon phosphate to every 100 mass parts of phosphate rock powder, after mixing, ball pressing , drying and cooling to obtain pellets. The drop strength of the green pellets prepared in this example is 35 times / 0.5m, the compressive strength is 24.5N / ball, and the burst temperature is 350°C. After drying, the drop strength of the pellets is 356 times / 0.5m, The compressive strength is 1060N / ball, the bursting temperature is 1210°C, and it can be kept at 1000°C for 2 hours without bursting. The pellets prepared in Example 1 have high compressive strength and good heat resistance performance, and can produce better economic benefits under the condition that the utilization rate of low-grade phosphate rock powder can be effectively improved.

Embodiment 2

[0036] First sieve the phosphate rock powder, and then add 1-10 mass parts of phosphoric acid, 0.5-2 mass parts of silicon phosphate, 5-10 mass parts of The carbonaceous reducing agent and 5-10 mass parts of silica powder are mixed, pelletized, dried and cooled to obtain pellets. The drop strength of the green pellets prepared in Example 2 is 42 times / 0.5m, the compressive strength is 25.8N / ball, and the burst temperature is 345°C. After drying, the drop strength of the pellets is 367 times / 0.5m , the compressive strength is 1120N / ball, the burst temperature is 1216°C, and it can be kept at 1000°C for 2 hours without bursting. The pellets prepared in Example 2 have high compressive strength and good heat resistance performance, and can produce better economic benefits under the condition that the utilization rate of low-grade phosphate rock powder can be effectively improved.

Embodiment 3

[0038] First sieve the phosphate rock powder, and then add 1-10 mass parts of phosphoric acid, 0.5-2 mass parts of silicon phosphate, 5-10 mass parts of The carbonaceous reducing agent, 5-10 parts by mass of silica powder and 1-5 parts by mass of rice husk ash are mixed, pelletized, dried and cooled to prepare pellets. The drop strength of the green pellets prepared in Example 3 is 48 times / 0.5m, the compressive strength is 27.8N / ball, and the burst temperature is 351°C. After drying, the drop strength of the pellets is 380 times / 0.5m , the compressive strength is 1125N / ball, the burst temperature is 1208°C, and it can be kept at 1000°C for 2 hours without bursting. The pellets prepared in Example 2 have high compressive strength and good heat resistance performance, and can produce better economic benefits under the condition that the utilization rate of low-grade phosphate rock powder can be effectively improved.

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PUM

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Abstract

The invention discloses a method for producing powdered rock phosphate pellets from low-grade powdered rock phosphate, and the method comprises the following steps: screening, proportioning, mixing, briquetting, drying and cooling; the proportioning procedure comprises the following steps: adding 1-10 parts by mass of phosphoric acid, 0.5-2 parts by mass of silicon phosphate, 5-10 parts by mass ofcarbonaceous reducing agent, 5-10 parts by mass of silica powder and 1-5 parts by mass of rice hull ash into every 100 parts by mass of powdered rock phosphate. The method is simple in process, easily available in raw materials, high in pellet strength and thermal stability and high in utilization rate of low-grade ground phosphate rock, has better economic and social benefits, and is easy to popularize and use.

Description

technical field [0001] The invention belongs to the technical field of phosphorus chemical industry, and in particular relates to a method for producing phosphate rock powder pellets by using low-grade phosphate rock powder. Background technique [0002] The production of industrial yellow phosphorus by the electric furnace method usually requires that the incoming materials such as phosphate rock have a certain particle size range. The particle size of the furnace charge and the state of the charge at high temperature will directly affect the normal progress of the reaction in the electric furnace. Only the charge that meets the requirements can be efficient. , Produce yellow phosphorus stably and reduce the ratio of mud phosphorus. With the depletion and depletion of phosphate rock resources, the price of rich ore continues to rise. For crushed phosphate rock or phosphate rock powder that does not meet the requirements of direct feed, the current common methods are: ① Grin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01
CPCC01B25/01
Inventor 徐可昇徐涛
Owner 云南省宣威东升化工有限公司
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