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A kind of preparation method of high-purity metallurgical lime

A lime and high-purity technology, applied in the field of iron and steel metallurgy, can solve the problems of reducing the impurity content of lime magnesia and silica, without considering the impurity content of silica, and not suitable for ultra-pure steel smelting, etc., to achieve low carbon content Effect

Active Publication Date: 2020-09-29
上海盛宝冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of its products are roasted limestone under different process conditions, which does not substantially reduce the content of magnesia and silica impurities in the lime, and mainly focuses on the carbon content in metallurgical lime, and does not take into account the carbon content of the limestone. The content of impurities such as silicon and magnesium oxide is not suitable for the smelting of ultra-pure steel

Method used

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  • A kind of preparation method of high-purity metallurgical lime
  • A kind of preparation method of high-purity metallurgical lime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Roasting of limestone, calcining limestone in a rotary kiln at a temperature of 1050°C to obtain activated calcium oxide; removing impurities and refining it into a particle size below 40mm;

[0035] (2) digestion of active calcium oxide, the active calcium oxide in step (2) is digested, obtains slaked lime (calcium hydroxide); The ratio of active calcium oxide and water 4:1 is digested, obtains calcium hydroxide; Remove impurities from calcium oxide; obtain calcium hydroxide with a purity greater than 93%;

[0036](3) pulping, the hydrated lime in step (3) is made into calcium hydroxide slurry; calcium hydroxide is added to water after cooling and precipitation process, wherein the ratio of hydrated lime to water is 8:1 to make hydrogen Calcium oxide slurry;

[0037] (4) pressure filtration, the calcium hydroxide slurry in step (4) is carried out pressure filtration with mechanical pressure filtration mode, and the filter bag mesh number is 100 orders; Remove wate...

Embodiment 2

[0042] (1) Roasting of limestone, the limestone in the limestone is roasted in a rotary kiln, and the calcining temperature is 1100 ° C to obtain activated calcium oxide;

[0043] (2) digestion of active calcium oxide, the active calcium oxide in step (2) is digested, obtains slaked lime (calcium hydroxide); The ratio of active calcium oxide and water 6:1 is digested, obtains calcium hydroxide; Remove impurities in calcium oxide; obtain calcium hydroxide with a purity of 98%;

[0044] (3) pulping, the calcium hydroxide in step (3) is added to water after cooling and precipitation process, wherein the ratio of slaked lime and water is 10:1 to make calcium hydroxide slurry;

[0045] (4) pressure filtration, the calcium hydroxide slurry in step (4) is carried out pressure filtration with mechanical pressure filtration mode, and the filter bag mesh number is 100 orders; Remove water-insoluble oxygen calcium magnesium, silicon dioxide in the slurry Impurities, obtain the calcium h...

Embodiment 3

[0050] (1) Roasting of limestone, the limestone in the limestone is roasted in a rotary kiln, and the calcining temperature is 1080° C. to obtain activated calcium oxide;

[0051] (2) digestion of active calcium oxide, the active calcium oxide in step (2) is digested, obtains slaked lime (calcium hydroxide); The ratio of active calcium oxide and water 5:1 is digested, obtains calcium hydroxide; Remove impurities in calcium oxide; obtain calcium hydroxide with a purity of 95%;

[0052] (3) pulping, the calcium hydroxide in step (3) is added to water after cooling and precipitation process, wherein the ratio of slaked lime and water is 10:1 to make calcium hydroxide slurry;

[0053] (4) pressure filtration, the calcium hydroxide slurry in step (4) is carried out pressure filtration with mechanical pressure filtration mode, and the filter bag mesh number is 100 orders; Remove water-insoluble oxygen calcium magnesium, silicon dioxide in the slurry Impurities to obtain calcium hyd...

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Abstract

The invention discloses high-purity metallurgical lime and a manufacturing method thereof. The high-purity metallurgical lime comprises chemical components including, by weight, 93-98% of CaO, 0.01-0.3% of SiO2, 0.01-0.3% of MgO, 0.001-0.02% of S and 0.01-0.15% of C. According to the manufacturing method, calcium oxide obtained by calcination of limestone is digested to obtain calcium hydroxide which is then subjected to pulping and filter pressing, most of silicon dioxide and magnesium oxide impurities in lime are removed in the process to obtain pure calcium hydroxide slurry, then the slurryis subjected to precipitation forming prior to calcination, and influences caused by carbon in raw materials to lime are eradicated due to adoption of natural gas or coal gas as energy sources for calcination.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for preparing high-purity metallurgical lime. Background technique [0002] Lime (CaO), as one of the most basic industrial raw materials in the iron and steel metallurgy and building materials industries, is usually decomposed by high-temperature calcination of limestone (CaCO3). In the iron and steel metallurgical industry, it is mainly used in multiple stations such as converter slagging, molten iron pretreatment, and out-of-furnace refining, with a consumption of more than 70kg / ton of steel. However, regardless of the metallurgical industry standard regulations (YB / T042-2004) or the physical quality of lime produced by various existing processes and equipment, there are problems with high silica, magnesium oxide impurity content and carbon content indicators and low reactivity. problem (see Table 1). The lime products produced by the prior art can be used in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/02C04B2/04
CPCC04B2/02C04B2/045
Inventor 刘欣隆孙树森聂爱军
Owner 上海盛宝冶金科技有限公司