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High efficiency lime powder product and production process thereof

A production process and powder technology, which is applied in the field of high-efficiency lime powder products and production processes, can solve the problems of large amount of surface modifier, spray gun, pipeline blockage, high fluidity, etc., and achieve improved utilization rate, less investment, high The effect of mobility

Active Publication Date: 2014-06-25
TAIYUAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no good solution to the problems of high hydrophobicity, high fluidity and low cost of lime powder products in China. There are often problems with spray guns and pipeline blockages, and the amount of surface modifier is large and the cost is low. Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Transformation equipment:

[0028] In this embodiment, a Raymond mill is selected, and a nozzle is installed above the belt of the feed port of the Raymond mill. The nozzle is connected to a micropump, and the surface modifier is delivered to the nozzle end through the micropump to realize mist spraying.

[0029] 2. Preparation process:

[0030] a. Pour 1 ton of active lime raw material roasted in a rotary kiln (with an activity of 400mL and a calcium oxide content of 92%) into the raw material warehouse of the production line through a vehicle or forklift, and then feed it into the jaw crusher through an electric vibrating feeder and crush it to The particle size is 10~20mm, and the crushed raw materials are sent to the intermediate warehouse by belt conveyor.

[0031] b. The crushed lime raw material is accurately measured by the belt batching scale and then enters the Raymond mill;

[0032] c. Spray 1kg of surface modifier continuously on the lime surface on the...

Embodiment 2

[0041] 1, transform equipment in the mode of embodiment 1;

[0042] 2. Preparation process:

[0043] a. Pour 1 ton of active lime raw material roasted in a shaft kiln (activity degree 350mL, calcium oxide content 85%) into the raw material warehouse of the production line through a vehicle or forklift, and then feed it into the jaw crusher through an electric vibrating feeder and crush it to a particle size The size is 10~20mm, and the crushed raw materials are sent to the intermediate warehouse by belt conveyor.

[0044] b. The crushed lime raw material is accurately measured by the belt batching scale and then enters the Raymond mill;

[0045] c. Spray 3kg of surface modifier continuously on the lime surface on the belt in the form of mist above the feed inlet belt, and enter the mill together with the lime;

[0046] The surface selected in this example change Sexual agent is 201 Dimethicone.

[0047] d. Use the low-pressure delivery pump to transport the qualified fi...

Embodiment 3

[0052] Embodiment 3: the comparative example of embodiment 1

[0053] 1. Preparation:

[0054] a. Pour 1 ton of active lime raw material roasted in a rotary kiln (with an activity of 400mL and a calcium oxide content of 92%) into the raw material warehouse of the production line through a vehicle or forklift, and then feed it into the jaw crusher through an electric vibrating feeder and crush it to a particle size The size is 10~20mm, and the crushed raw materials are sent to the intermediate warehouse by belt conveyor.

[0055] b. The crushed lime raw material is accurately measured by the belt batching scale and then enters the mill;

[0056] c. Use the low-pressure conveying pump to transport the qualified finished products to the finished product warehouse;

[0057] d. Product samples are sent for index testing;

[0058] e. The product is sent to the steel mill by tank truck for pretreatment and desulfurization of molten iron.

[0059] 2. Detection

[0060] Sampl...

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Abstract

The invention discloses a high efficiency lime powder product and a production process thereof and particularly relates to a surface-modified lime powder product used in molten iron desulfurization pretreatment process and a production process thereof. According to the production process, silicone oil is firstly selected as surface modifier to be sprayed on crushed active lime; the adding amount of the surface modifier is 0.1-0.3% in percentage by weight. The surface-modified lime powder product disclosed by the invention has the advantages that the powder product is high in hydrophobicity and flowability and low in cost and is suitable for molten iron desulfurization pretreatment; the problems that a gun is blocked by lime powder and the lime powder is bonded on the material tank wall in the molten iron pretreatment process can be well solved, the lime powder can effectively penetrate through a gas-liquid interface and enter the interior of molten iron, so that the use ratio of calcium oxide is increased by a large margin and the molten iron pretreatment cost can be remarkably reduced; in addition, the production process of the powder product is simple, can be carried out at room temperature and is relatively simple in equipment, so that the powder product is small in investment, low in cost and high in efficiency.

Description

technical field [0001] The invention relates to a high-efficiency lime powder product and a production process, in particular to a surface-modified lime powder product used in a molten iron pretreatment desulfurization process and a production process thereof. Background technique [0002] Hot metal pretreatment and desulfurization technology is a technology widely used in the iron and steel smelting process at present. An important means of desulfurization in molten iron pretreatment, which requires lime to have excellent hydrophobicity and fluidity, so it is necessary to find a surface modifier and develop a new surface modification process. At the same time, economic benefits should be considered as far as possible for the surface modification materials used, so that the price of modified lime is relatively low. [0003] In the past, most domestic enterprises used lime in the pretreatment of molten iron without surface treatment. We know that lime has the characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 程立康彦萍王军
Owner TAIYUAN IRON & STEEL GROUP
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