The distinction of magnesian chromic brick:
1, common magnesium chromic brick
2, combine magnesian chromic brick directly
3, combine magnesian chromic brick partly
4, chromic brick of electric frit magnesium
5, electric frit combines magnesian chromic brick partly
6, avoid brick of the chromium that burn magnesium
The definition of magnesian chromic brick:
Is magnesian chromic brick to contain MgO 55% ? 80% , Cr2O3 8% ? The products of alkalescent and fireproof data of 20% , with Fang Mei stone, compound pointed spar reachs a few silicate phases be formed. Compound pointed spar includes the pointed spar solid solution such as MgAl2O4, MgFe2O4, MgCr2O4 and FeAl2O4.
And magnesian chromic brick and the distinction that combine magnesian chromium brick directly depend on 1: Contain magnesia (raw material) purity 2: Firing temperature, firing temperature is in common magnesium chromic brick ℃ of 1550 ℃ ~1600, firing temperature is in direct magnesium chromic brick 1700 ℃ above, because its are when 1700 ℃ above, magnesian chromic brick microstructure happening changes, square magnesian stone and chromic ore are united in wedlock directly, call chromic brick of direct union magnesium so. Combine magnesian chromic brick directly each respect function all excel is common magnesian chromic brick.
1, common magnesium chromic brick
This is traditional product, make thick grain with chromic mine, magnesia makes fine noodles or vermicelli made from bean or sweet potato starch. Or two kinds of material use grading grain composition, firing temperature is commonly 1550? 1600 ℃ . A very few and direct union that the microstructure of this kind of brick behaves grain of the mine that it is chromium and Fang Mei stone, it is silicate more (the Tuo Rong in CMS) cementation or stone of Fang Mei of cranny segregation; is little, be united in wedlock directly rarely in matrix, the mechanical performance of this kind of brick is poor, performance of the corrode that fight broken bits is poor.
2, combine magnesian chromic brick directly
In common magnesium the development on the foundation of chromic brick rises combine magnesian chromic brick directly, its produce a characteristic to basically have at 2 o'clock, it is to use purer raw material, 2 it is to use taller firing temperature. So called direct union is the chromium in pointing to a brick there is more direct contact between mine grain and square magnesian Shi Zhi, because is raw material medium is SiO2 less (is control in 1% ? 25% the following) , silicate makes an amount little, through high temperature firing the method makes silicate extruding arrives in the corner of solid photograph grain. Improve the direct tie of solid photograph thereby.
Because direct couple rate is high,combine magnesian chromic brick directly, make the brick has the higher high temperature intensity, sex that fight broken bits thereby, fight erode, be able to bear or endure erode, anti-corrosive reach excellent thermal shock stability and the bulk stability below 1800 ℃ .
3, the magnesian chromic brick of collective agglomeration
The characteristic of technology of production of this kind of goods is the furnace of compound high temperature that will press fine pink of the magnesia that deserves to compare certainly and chromic mine is burned, implementation generates pointed spar and magnesia 2 times - chromic mine combines the solid that is a purpose to answer instead directly, make take collective agglomeration stuff, make with this makings firing goods or chemical union goods.
The homogeneity of the direct union of chromic brick of collective agglomeration magnesium and microstructure is directer combinative brick is better, square magnesian stone takes off 2 pointed spar between dissolve photograph and brilliant to measure more, chromic brick of collective agglomeration magnesium has the performance with a series of directer union better bricks, you Yigao lukewarm intensity, be able to bear or endure temperature leap sex and the sex that fight broken bits is celebrated.
Collective fired brick still can be divided for two breed, it is completely collective fired brick, grain and fine pink fasten collective agglomeration makings completely, no matter be firing or the; that its microstructure of chemical union basically is likeness 2 it is partial collective fired brick, there is one share in burden, for instance thick grain uses collective agglomeration material, and fine pink part can use fine chromic mine and magnesia paper pink to mix by certain proportion in matching a brick, the so firing product that combines with chemistry is on microstructure somewhat difference.
4, recombine magnesium chromic brick
Make with electric frit law magnesian chromic mixed powder expects melt, pass fuse-element crystallization, form microstructure quite even, the raw material that with magnesian chromic needle spar and Fang Mei stone mix brilliant to be comprised for main photograph, smash chromic makings of magnesium of frit of this kind of report into certain grain granuality, mix shape, classics is firing with preparation recombine brick, or use directly make brick of chemical knot stage.
The direct union that the microstructure feature of recombine brick is height and contain many pointed spar to take off dissolve photograph: Contain a large number of photographs that take off dissolve base brilliant, from the physico-chemical character that changed square magnesian stone substantially, if reduce hot coefficient of expansion, raise heatproof shake sex, improve pair of acid - the counteractive ability that basic slag erodes. Recombine brick has the character that uses effect likeness with founding brick, but having is better than founding brick be able to bear or endure temperature leap sex and evener microstructure.
Recombine magnesium chromic brick distributings for air hole matrix of even ground granule, have tiny flaw, turn to the sensitivity excel founding of temperature leap. Between brick of casting of Yu Rong of interpose of goods high temperature capability and direct union brick.
5, founding magnesium chromic brick
magnesia and furnace of electric arc of park of chromic mine mixture inside complete melt, next fuse-element infuse the casting inside fireproof mould is caused model. The square magnesian Shihe that generates stability in caky process is pointed spar brilliant photograph, form meticulous crystallization organization at the same time, so founding magnesium chromic brick has superior high temperature strength and sex of the corrode that fight broken bits.
Founding magnesium chromic brick and chromic material of electric frit magnesium are same, the direct couple that has height and contain many pointed spar to take off dissolve photograph, this kind of goods sends density tall, slaggy and not easy permeate, reason fighting broken bits function is better than combining a brick directly, but heatproof shake sex compares above two kinds of products are wrong.
Magnesian chromic brick and magnesian chromium are pouring expect what go up in construction is normative:
1, body of each place build by laying bricks or stones should seam wet build by laying bricks or stones according to designing formulary fault.
2, when hearth foundation layer chooses wet build by laying bricks or stones of tall aluminous brick, must not stay set expand seam. The aperture appropriate between tall aluminous brick and furnace casing uses relevant material to pledge fireproof pound dozen of makings to fill solid.
3, the construction that magnesian chromium pounds dozen of makings should press GB 50211-2014 the 10.1.3rd regulation is carried out. Pound the construction that lay a layer to end, should press drying-out curve roast.
4, reserve when layer and working layer turn over arch hearth for arc, does 10mm apply between two bricks that turn over arch? The magnesian chromium with thick 100mm pounds dozen of makings to look for accurate radian. Brick of foot of the arch that turn over arch should be machined subtly, upside of layer of arch foot brick should level. Working layer arc turns over arch bottom nadir to should be in with platoon eat dishes without rice or wine same standard position.
5, on broken bits line, build by laying bricks or stones of next annulus of boiler setting appropriate. Boiler setting should be in build by laying bricks or stones of the section after make level of the fixed, coping that turn over arch builds hearth firebrick. Bath area has water to cover structural boiler setting, magnesian chromic brick should rely on water closely to cover build by laying bricks or stones to build. retreat a stage to should agree equably.
6, reserve the fireproof filling between layer and working layer, boiler setting and furnace casing should chase a layer to pound solid, expand seam should stay by design regulation set. Between boiler setting coping and roof cover expand seam application a place of strategic importance of felt of fiber of fireproof pottery and porcelain is true.
7, roof cover is fireproof and pouring before makings construction, surface of component of be heated steel should gush is brushed high temperature resistant paint. Roof cover is fireproof and pouring makings board piece after construction, answer to set conserve, installation by the design, board piece the aperture application between is fireproof a place of strategic importance of rope of fiber of pottery and porcelain is close.
8, lasher mouth and safety discharge a mouth to answer beforehand build by laying bricks or stones is built, should build with build by laying bricks or stones of body of heater undertake at the same time, must not stay set expand seam.
9, very strong dominant position is had in the application of industry of nonferrous metal smelt, its are operated easily, control is quick, specific power consumption is inferior. But life of body of heater is briefer, fireproof material is marred faster, the select material because of its construction and this fireproof material more important.
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