Production method of ultralow-magnesium and low-silicon active refined lime

A production method and technology of refined lime, applied in solid separation, flotation and other directions, can solve the problems of increased energy consumption, powder materials are not suitable for the production process conditions of rotary kiln, etc., and achieve low power consumption, simple structure and convenient maintenance. Effect

Inactive Publication Date: 2022-02-01
HUNAN HENGSHAN BICHENG CALCIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although low-grade limestone is crushed, ball milled or stick milled to less than 100μm, MgO and SiO are removed by flotation 2 Impurities increase the calcium carbonate content in limestone, but grinding low-grade limestone to below 100 μm not only greatly increases energy consumption, but also the powder material is not suitable for the existing rotary kiln production process conditions

Method used

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  • Production method of ultralow-magnesium and low-silicon active refined lime
  • Production method of ultralow-magnesium and low-silicon active refined lime
  • Production method of ultralow-magnesium and low-silicon active refined lime

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A kind of production method of ultra-low magnesium, low silicon active fine lime, comprises the following steps:

[0047] Step 1) Preparation of surfactant: Weigh N-hexadecyliminodiacetic acid sodium, normal fatty alcohol, and water glass with a mass ratio of 1:5:3, and mix them into a uniform solution;

[0048] Step 2) Preparation of limestone raw material: According to the above-mentioned production process of limestone raw material, the production process of closed-circuit crushing process with two-stage crushing and two-stage screening + gravity separation and addition of 6.0 / 10,000 limestone mass surfactant , to obtain limestone raw materials that basically meet the quality requirements for calcination of ultra-low magnesium and low silicon active refined lime;

[0049] Step 3) Limestone raw material preheating: Preheat the limestone raw material in step 2), the temperature is 680°C, the preheating time is 200min, the outlet temperature of the preheater is 280°C, and...

Embodiment 2

[0054] Step 1) Preparation of surfactant: Weigh N-hexadecyliminodiacetic acid sodium, normal fatty alcohol, and water glass with a mass ratio of 1:6:3, and mix them into a uniform solution;

[0055] Step 2) Preparation of limestone raw material: According to the above-mentioned production process of limestone raw material, the production process of closed-circuit crushing process with two-stage crushing and two-stage screening + gravity separation and adding 7.0 / 10,000 limestone mass surfactant , to obtain limestone raw materials that basically meet the quality requirements for calcination of ultra-low magnesium and low silicon active refined lime;

[0056] Step 3) Limestone raw material preheating: preheat the limestone raw material in step 2), the temperature is 700°C, the preheating time is 220min, the outlet temperature of the preheater is 320°C, and the temperature of the center point of the preheater is 1100°C; the limestone raw material is preheated The decomposition ra...

Embodiment 3

[0061] Step 1) Preparation of surfactant: Weigh N-hexadecyliminodiacetic acid sodium, normal fatty alcohol, and water glass with a mass ratio of 1:4:3, and mix them into a uniform solution;

[0062] Step 2) Preparation of limestone raw material: According to the above-mentioned production process of limestone raw material, the production process of closed-circuit crushing process with two-stage crushing and two-stage screening + gravity separation and adding 5.0 / 10,000 limestone mass surfactant , to obtain limestone raw materials that basically meet the quality requirements for calcination of ultra-low magnesium and low silicon active refined lime;

[0063] Step 3) Limestone raw material preheating: preheat the limestone raw material in step 2), the temperature is 720°C, the preheating time is 240min, the outlet temperature of the preheater is 300°C, and the temperature of the center point of the preheater is 1120°C; the limestone raw material is preheated The decomposition ra...

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Abstract

The invention discloses a production method of ultralow-magnesium and low-silicon active refined lime. The ultralow-magnesium and low-silicon active refined lime is prepared by reducing the content of Mg and Si impurities in limestone raw materials and lime step by step through the procedures of preparing a surfactant, pretreating the limestone raw materials, calcining the lime and the like. The process is reasonable in design, the obtained ultralow-magnesium and low-silicon active refined lime is stable in quality, low in impurity element content and high in activity, and specifically, calcium oxide is larger than or equal to 92%, the activity degree is larger than or equal to 400 ml, the sulfur content is smaller than or equal to 0.01%, the carbon content is smaller than or equal to 0.02%, MgO is smaller than or equal to 0.5%, and SiO2 is smaller than or equal to 0.8%.

Description

technical field [0001] The invention belongs to the technical field of chemical smelting, and in particular relates to a production method of ultra-low magnesium and low silicon active fine lime. Background technique [0002] Due to its high activity, fast reaction speed, low price, and easy sedimentation and separation of residues, activated lime is widely used in fine chemical industry, papermaking, mineral processing, smelting, environmental protection, medicine and hygiene, and food. However, there are a large number of low-grade limestone mines in my country. Due to the limitation of limestone resources, the lime SiO produced under the existing mine resources and technological conditions 2 , MgO content is too high, the application effect and range are greatly affected. [0003] Chinese patent ZL201510231514.2 discloses a production method of high-efficiency active lime, which includes the steps of raw material selection, screening and washing, preparation of additives...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10B03B9/00B03B1/00B03D1/008B03D1/01B03D1/002B03D101/04B03D101/02B03D101/00
CPCC04B2/10C04B2/108B03B9/00B03B1/00B03D1/008B03D1/01B03D1/002B03D2201/04B03D2201/02B03D2201/005
Inventor 邓金营邓长征
Owner HUNAN HENGSHAN BICHENG CALCIUM IND CO LTD
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