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Method for utilizing caustic calcined dolomite

A technology for lightly burning dolomite powder and lightly burning dolomite, which is applied in the field of utilization of lightly burning dolomite powder, can solve the problems of low MgO content, high production cost, environmental pollution and the like, achieves high production efficiency, short process and avoids environmental pollution Effect

Active Publication Date: 2011-07-20
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the roasting production process, about 10% of the lightly burned dolomite powder with a particle size of less than 10mm is produced every year. These powders cannot be directly added to the converter or electric furnace because the particle size is too small. serious pollution to the environment
Many enterprises use lightly burned dolomite powder to make magnesium metal, but the disadvantage is that the effective MgO content is too low and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The utilization method embodiment of this lightly burned dolomite powder is the following steps in sequence:

[0036] 1. Ingredients

[0037] Finely grind the lightly burned dolomite, fine grinding requirements: the maximum particle size is 1mm, and 92% of the particles are less than 0.5mm;

[0038] Lightly burned dolomite powder, 20% MgCl 2 The solution is mixed with 325# cement according to the following quality:

[0039] Lightly burned dolomite powder 100kg cement 3kg

[0040] MgCl 2 Solution 20kg

[0041] Lightly burnt dolomite powder, cement and MgCl with a forklift 2 The solution is mixed evenly to form a mixture, and the MgCl in the mixture 2 It is 4kg. Until no white cement can be seen.

[0042] 2. Add organic binder

[0043] Spray 37.5kg of polyvinyl alcohol organic binder with a prepared concentration of 4% onto the mixture, and mix evenly (the quality of polyvinyl alcohol in the organic binder is 1.5kg). Then the material is transported to the doubl...

Embodiment 2

[0049] The difference between this example and Example 1 is that in step 1, during the batching, MgCl is added to the lightly burned dolomite powder 2 After the solution, mix well first, then add cement and then mix well.

[0050] The cement of above-mentioned two embodiments also can replace with 425#, 525#. What two embodiment used is the II type pair of roller briquetting machine that Luoyang Guoao Machinery Co., Ltd. produces.

[0051] The mixing described in the above two embodiments in step 1, batching and step 2, adding organic binder can be mixed with a forklift, or can be stirred and mixed evenly with a mixer.

[0052] The concentrations described in the present application documents are mass percent concentrations.

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Abstract

The invention relates to a method for utilizing caustic calcined dolomite. The method sequentially comprises the following steps of: 1, blending: performing fine grinding on caustic calcined dolomite and uniformly mixing 1 part of ground caustic calcined dolomite, 0.03-0.05 part of MgCl2 solution with the concentration of 15-25 percent and 0.02-0.05 part of cement; 2, adding an organic adhesive: spraying a polyvinyl alcohol organic adhesive with the concentration of 3-5 percent onto the mixture and uniformly mixing, wherein the mass of polyvinyl alcohol in the organic adhesive accounts for 0.01-0.02 percent of the mass of dolomite dust; 3, extruding and forming: conveying the mixture, into which the organic adhesive is added, onto a ball press for pressing into balls; and 4, curing the balls by natural drying, wherein the measured intensity is between 1,300N / ball and 1,800N / ball. The method for utilizing the caustic calcined dolomite has a low production cost, and environmental pollution caused by dolomite dust is avoided.

Description

technical field [0001] The invention relates to a utilization method of lightly burned dolomite powder. Background technique [0002] After the dolomite raw ore is mined, in order to make better use of it in the steelmaking process, the raw ore needs to be roasted to make the CaCO 3 Decompose to generate CaO, MgCO 3 Decompose to generate MgO. However, in the roasting production process, about 10% of the lightly burned dolomite powder with a particle size of less than 10mm is produced every year. These powders cannot be directly added to the converter or electric furnace because the particle size is too small. Serious pollution to the environment. Many enterprises use light-burned dolomite powder to make magnesium metal, but the disadvantage is that its effective MgO content is too low and the production cost is high. In order to effectively utilize light-burned dolomite powder and solve the backlog problem of light-burned dolomite powder, it has become an imminent subjec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C21C7/04
Inventor 史永林王立新李建军叶文成仪桂兰
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD