A kind of method of Studies onthe Synthesis at Low Temperature Syntheses of MgTechnical field
The present invention relates to a kind of working method, especially a kind of method of Studies onthe Synthesis at Low Temperature Syntheses of Mg.
Background technology
Bauxitic clay base magnesium-aluminium spinel adopts Al2o3the fine aluminum alumina of content more than 76% and the high-quality caustic-calcined magnesite of content of MgO more than 95%, its volume density is large, and mineral facies content is high, and grain development is good, even structure, steady quality.Magnesium-aluminium spinel is owing to having higher fusing point and intensity, and good corrosion resistance, good thermal shock stability is one of first-selection of synthesis high-quality refractory material always.But, conventional solid sintering synthetic MgAl spinal is along with the volumetric expansion of 5-8%, and its recrystallize ability, therefore magnesium-aluminium spinel is through multistage homogenizing process, form through more than 1800 DEG C high temperature sinterings in ultra-high-temperature tunnel kiln or electric arc furnace, very high to the requirement of equipment like this, energy consumption is also very large.
Summary of the invention
The present invention is intended to solve the problem, and provides a kind of method of Studies onthe Synthesis at Low Temperature Syntheses of Mg, and its sintering temperature is low, only has 1500 DEG C, less energy consumption, and cost of material is cheap, and cost is low, and its technical scheme adopted is as follows:
A method for Studies onthe Synthesis at Low Temperature Syntheses of Mg, is characterized in that, its step is followed successively by:
A) raw material: raw material choose aluminum manufacturer sludge and magnesium basic carbonate;
B) prepare burden: mud and magnesium basic carbonate are carried out preparing, mixing according to the ratio of 3:2 (massfraction);
C) broken: raw material is put into high energy ball mill and grinds 3-4 hour, wherein material, ball, water ratio are 1:2:1, rotating speed 200-230 rev/min;
D) dry: ground raw material is dried 4-6 hour at the temperature of 120 DEG C, and then sieve (200 order);
E) mix: select concentration be the polyvinyl alcohol liquation of 5% as bonding agent, distribute full and uniform with the material prepared through mix to reach with squeezing action, bonding agent add-on is 3%;
F) shaping: under the pressure of 200MPa, compound is pressed into the brick base substrate being of a size of 230 × 113 × 65mm;
G) dry: at the temperature of 120 DEG C, with steam seasoning, the moisture in adobe is got rid of, dry 24 hours;
H) burn till: adobe is put into high temperature kiln and be heated to 1500 DEG C, and be incubated 3-5 hour;
I) cool: close kiln power supply, take out after adobe is with stove naturally cooling.
Tool of the present invention has the following advantages: method is simple, convenient, easily grasps, low in raw material price and proportioning is easy, and sintering temperature is low, less energy consumption.Have higher fusing point and intensity with the magnesium-aluminium spinel that this method is produced, good corrosion resistance, slag resistance and heat are shaken stability, long service life, are a kind of methods of Studies onthe Synthesis at Low Temperature Syntheses of Mg of high-quality, low cost.
Accompanying drawing explanation
Fig. 1: preparation method's schema of the present invention;
Embodiment
Below in conjunction with accompanying drawing and example, the invention will be further described:
As shown in Figure 1, a kind of method of Studies onthe Synthesis at Low Temperature Syntheses of Mg, is characterized in that, its step is followed successively by:
A) raw material: raw material choose aluminum manufacturer sludge and magnesium basic carbonate;
B) prepare burden: mud and magnesium basic carbonate are carried out preparing, mixing according to the ratio of 3:2 (massfraction);
C) broken: raw material is put into high energy ball mill and grinds 3-4 hour, wherein material, ball, water ratio are 1:2:1, rotating speed 200-230 rev/min;
D) dry: ground raw material is dried 4-6 hour at the temperature of 120 DEG C, and then sieve (200 order);
E) mix: select concentration be the polyvinyl alcohol liquation of 5% as bonding agent, distribute full and uniform with the material prepared through mix to reach with squeezing action, bonding agent add-on is 3%;
F) shaping: under the pressure of 200MPa, compound is pressed into the brick base substrate being of a size of 230 × 113 × 65mm;
G) dry: at the temperature of 120 DEG C, with steam seasoning, the moisture in adobe is got rid of, dry 24 hours;
H) burn till: adobe is put into high temperature kiln and be heated to 1500 DEG C, and be incubated 3-5 hour;
I) cool: close kiln power supply, take out after adobe is with stove naturally cooling.
Describe the present invention by way of example above, but the invention is not restricted to above-mentioned specific embodiment, all any changes of doing based on the present invention or modification all belong to the scope of protection of present invention.