CN101913886B - 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of refractory materials, and discloses a 95 chromium-aluminum-zirconium brick for a coal water slurry pressurized gasifier and a preparation method thereof. The 95 chromium-aluminum-zirconium brick comprises electrically fused chromium oxide, chromium oxide green, fine zirconium oxide powder, fine alpha-Al2O3 powder and an adhesive serving as raw materials in percentage by weight; the preparation method comprises the following steps of: (1) weighing the raw materials in percentage by weight; (2) mixing and rolling the raw materials in a wet mill toform slurry; (3) pressing the slurry in a friction press to prepare a half-finished product; (4) drying the half-finished product in a drying kiln; (5) firing the dried half-finished product in an automatic shuttle kiln; and (6) taking the finished product out of the kiln, and checking the appearance and the physicochemical property of the product. Compared with the conventional 90 chromium-aluminum-zirconium brick, the 95 chromium-aluminum-zirconium brick has the advantages that the scour resistance, corrosion resistance, volume density, and ambient compressive strength are improved and the service life of the 95 chromium-aluminum-zirconium brick is improved by 20 to 50 percent.

Description

A kind of 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier and preparation method thereof

Technical field

The invention belongs to technical field of refractory materials, especially relate to a kind of 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier and preparation method thereof.

Background technology

At present, the coal water slurry pressurized gasifier face brick that warms oneself in front of a fire generally adopts 90 chromium aluminium zirconia blocks (being commonly called as high-chrome brick).The physical and chemical index of 90 chromium aluminium zirconia blocks is: Cr ₂O ₃Mass content 〉=86%, ZrO ₂Mass content is 4～7%, Fe ₂O ₃Mass content≤0.4%, volume density 〉=4.2g/cm ³, apparent porosity≤17%, cold crushing strength 〉=100Mpa.Owing to the advantage that foreign matter contents such as that 90 chromium aluminium zirconia blocks have that volume density is big, apparent porosity is low, normal temperature is withstand voltage is big, ferric oxide and silicon oxide are few, have a good hot stability simultaneously, high temperature creep-resisting performance etc., these have satisfied the requirement of vapourizing furnace side towards the fire with refractory materials, so 90 chromium aluminium zirconia blocks are optimal selections of the anti-material of present vapourizing furnace side towards the fire.

But along with the improvement of coal gasifying process technology, the increase of the type of furnace and vapourizing furnace sprays four nozzles by improvement from top spray single nozzle to side, 90 chromium aluminium zirconia blocks are at the vault of vapourizing furnace and be respectively about 5,000 hours, 4,000 hours the work-ing life at cinder notch position, seriously restricted go into operation operating rate and the economic benefit of enterprises of vapourizing furnace.

Summary of the invention

For addressing the above problem, the purpose of this invention is to provide a kind of 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier and preparation method thereof.

For achieving the above object, the present invention adopts following technical scheme:

A kind of 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, it adopts following weight percent feedstock production to form: electric smelting chromic oxide 4mm～2mm 40%～50%; Electric smelting chromic oxide 2mm～0mm15%～25%; Electric smelting chromic oxide≤0.088mm 21%～23.5%; Chromoxide green 5.0%～6.0%; Zirconium white micro mist 1.5%～3.0%; α-Al ₂O ₃Micro mist 5.0%～6.0%; Add the wedding agent by above-mentioned raw materials total amount per-cent 3.0%～4.0% again.

Described 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, chromic oxide weight percent 〉=99% in its electric smelting chromic oxide.

Described 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, its chromoxide green be by the granulometric composition of particle diameter smaller or equal to 5 μ m, chromic oxide weight percent 〉=99% in the chromoxide green.

Described 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, its zirconium white micro mist be by the granulometric composition of particle diameter smaller or equal to 5 μ m, zirconium white weight percent 〉=97% in the zirconium white micro mist.

Described 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, its α-Al ₂O ₃Micro mist is by the granulometric composition of particle diameter smaller or equal to 5 μ m, α-Al ₂O ₃α-Al in the micro mist ₂O ₃Weight percent 〉=99%.

Described 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, its wedding agent are aluminium dihydrogen phosphate and dextrin.

Described 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, the step of preparation process of its raw material electric smelting chromic oxide is: at first with Cr ₂O ₃The industrial oxidation chromium of weight percent 〉=99% is green to place 2150～2200 ℃ of electric arc furnace electric smelting; Naturally cool to room temperature; Taking-up is carried out carse, medium and small broken then; Carry out sieve classification again, obtain particle diameter be respectively 4mm～2mm, 2mm～0mm ,≤three kinds of particles of 0.088mm, be electric smelting chromic oxide raw material.

A kind of preparation method of 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, it comprises following processing step:

(1), takes by weighing raw material electric smelting chromic oxide, chromoxide green, zirconium white micro mist, α-Al by above-mentioned weight percent ₂O ₃Micro mist, wedding agent;

(2), above-mentioned raw materials is put into the edge runner-wet mill mixing rolled the one-tenth pug 25～30 minutes;

(3), above-mentioned pug is put into friction press or hydraulic press, with 300Mpa～500Mpa extrusion forming, make work in-process;

(4), place dry kiln dry work in-process, begin to be warming up to 120 ℃ with the speed of 10 ℃/min from room temperature, be incubated 72 hours, be cooled to room temperature then;

(5), place the automatization shuttle kiln to burn till work in-process after the drying, begin to be warming up to 1680～1720 ℃ with 30～40 ℃/min from room temperature, be incubated 10 hours, stop kiln, be cooled to room temperature then;

(6), treat automatization shuttle kiln internal cooling to room temperature, the finished product kiln discharge; Product is carried out outward appearance and physical and chemical inspection.

Because adopt aforesaid technical scheme, the present invention has following superiority:

This 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, its physical and chemical index is: Cr ₂O ₃Weight percent is 91～94%, ZrO ₂Mass content is 1～3%, Fe ₂O ₃Mass content≤0.3%, volume density 〉=4.30g/cm ³, apparent porosity≤17%, cold crushing strength is 120～160Mpa; Cr ₂O ₃Weight percent brings up to 91～94% by about 86%, has improved the erosion-resisting characteristics of goods 95 chromium aluminium zirconia blocks; Utilize ZrO ₂The phase transformation volume change, i.e. transformation toughening principle improves the thermal shock resistance of goods, improves the thermal shock resistance of goods; By adding an amount of chromoxide green micro mist, zirconium white micro mist and α-Al ₂O ₃Micro mist reduces the apparent porosity of goods, thereby improves permeability resistance and the aggressiveness of goods; The volume density of goods is by 4.2g/cm ³About bring up to 4.30g/cm ³, and the cold crushing strength of goods brings up to 120～160Mpa about by 100Mpa, all can improve the scour resistance of goods.95 chromium aluminium zirconia blocks of the present invention are compared with existing 90 chromium aluminium zirconia blocks, and improved 20～50% its work-ing life, for the user creates very considerable economic.

The preparation method of this 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, it adopts high pure raw material, and namely main raw material principal constituent mass content has been avoided the detrimentally affect of impurity to quality product all greater than 99%; Adopt electric smelting technology to make electric smelting chromic oxide raw material, make raw material crystal grain zoon, crystal grain is bigger, and volume density significantly improves, and has improved the resistance to fouling of product; Work in-process adopt high-pressure molding, have improved volume density and the compressive strength of product; Work in-process adopt far infrared drying, have improved drying efficiency, and have improved half-finished qualification rate; Finished product adopts high temperature to burn till, and has improved the structural strength of product, and then has improved antiscour and the resistance to fouling of product.

Embodiment

Can be described in further detail the present invention with reference to following examples; But the present invention is not limited to these embodiment.

Embodiment 1

A kind of 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, its raw materials by weight meter: electric smelting chromic oxide 4mm～2mm 40%, electric smelting chromic oxide 2mm～0mm 25%, electric smelting chromic oxide≤0.088mm 23.5%, chromoxide green 5.0%, zirconium white micro mist 1.5%, α-Al ₂O ₃Micro mist 5.0%; By described raw material total amount per-cent, add aluminium dihydrogen phosphate 2.5% again, dextrin 0.4%.

Embodiment 2

A kind of 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, its raw materials by weight meter: electric smelting chromic oxide 4mm～2mm 45%, electric smelting chromic oxide 2mm～0mm 20%, electric smelting chromic oxide≤0.088mm 22.5%, chromoxide green 5.0%, zirconium white micro mist 2.0%, α-Al ₂O ₃Micro mist 5.5%; By described raw material total amount per-cent, add aluminium dihydrogen phosphate 3.0% again, dextrin 0.35%.

Embodiment 3

A kind of 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, its raw materials by weight meter: electric smelting chromic oxide 4mm～2mm 50%, electric smelting chromic oxide 2mm～0mm 15.0%, electric smelting chromic oxide≤0.088mm 21.0%, chromoxide green 5.0%, zirconium white micro mist 3.0%, α-Al ₂O ₃Micro mist 6.0%; By described raw material total amount per-cent, add aluminium dihydrogen phosphate 3.5% again, dextrin 0.3%.

In the above embodiments, chromic oxide weight percent 〉=99% in the electric smelting chromic oxide; Chromoxide green is by the granulometric composition of particle diameter smaller or equal to 5 μ m, chromic oxide weight percent 〉=99% in the chromoxide green; The zirconium white micro mist is by the granulometric composition of particle diameter smaller or equal to 5 μ m, zirconium white weight percent 〉=97% in the zirconium white micro mist; α-Al ₂O ₃Micro mist is by the granulometric composition of particle diameter smaller or equal to 5 μ m, α-Al ₂O ₃α-Al in the micro mist ₂O ₃Weight percent 〉=99%; Aluminium dihydrogen phosphate is liquid; Dextrin is powdery, meets 2005 editions Chinese Pharmacopoeia standards.

Described 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, the step of preparation process of its raw material electric smelting chromic oxide is: at first with Cr ₂O ₃The industrial oxidation chromium of weight percent 〉=99% is green to place 2150～2200 ℃ of electric arc furnace electric smelting; Naturally cool to room temperature; Taking-up is carried out carse, medium and small broken then; Carry out sieve classification again, obtain particle diameter be respectively 4mm～2mm, 2mm～0mm ,≤three kinds of particles of 0.088mm, be electric smelting chromic oxide raw material.

The preparation method of described 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, its concrete processing step is:

(1), takes by weighing raw material electric smelting chromic oxide, chromoxide green, zirconium white micro mist, α-Al by weight percentage ₂O ₃Micro mist, aluminium dihydrogen phosphate, dextrin;

(2), above-mentioned raw materials is put into the edge runner-wet mill mixing rolled the one-tenth pug 25～30 minutes;

(3), above-mentioned pug is put into friction press or hydraulic press, with 300Mpa～500Mpa extrusion forming, make work in-process;

(4), place dry kiln dry work in-process, be warming up to 120 ℃ from 25 ℃ of beginnings of room temperature with the speed of 10 ℃/min, be incubated 72 hours, naturally cool to room temperature then;

(5), place the automatization shuttle kiln to burn till work in-process after the drying, begin to be warming up to 1680～1720 ℃ with 30～40 ℃/min from room temperature, be incubated 10 hours, stop kiln, naturally cool to room temperature then;

(6), treat to naturally cool to room temperature in the automatization shuttle kiln after, the finished product kiln discharge; Product is carried out outward appearance and physical and chemical inspection.

In the above-mentioned steps (5), dry back work in-process burn till in the automatization shuttle kiln, and sintering curve is:

Claims (1)

1. the preparation method of a 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier, it is characterized in that: it comprises following processing step:

(1), takes by weighing raw material electric smelting chromic oxide, chromoxide green, zirconium white micro mist, α-Al ₂O ₃Micro mist, wedding agent, each raw material adopts following weight percent: electric smelting chromic oxide 4mm～2mm40%～50%, electric smelting chromic oxide 2mm～0mm15%～25%, electric smelting chromic oxide≤0.088mm21%～23.5%, chromoxide green 5.0%～6.0%, zirconium white micro mist 1.5%～3.0%, α-Al ₂O ₃Micro mist 5.0%～6.0%, wedding agent counts 3.0%～4.0% by above-mentioned raw materials total amount per-cent;

(2), above-mentioned raw materials is put into the edge runner-wet mill mixing rolled the one-tenth pug 25～30 minutes;

(3), above-mentioned pug is put into friction press or hydraulic press, with 300MPa～500MPa extrusion forming, make work in-process;

(4), place dry kiln dry work in-process, begin to be warming up to 120 ℃ with the speed of 10 ℃/min from room temperature, be incubated 72 hours, be cooled to room temperature then;

(5), place the automatization shuttle kiln to burn till work in-process after the drying, begin to be warming up to 1680～1720 ℃ with 30～40 ℃/min from room temperature, be incubated 10 hours, stop kiln, be cooled to room temperature then;

(6), treat automatization shuttle kiln internal cooling to room temperature, the finished product kiln discharge; Product is carried out outward appearance and physical and chemical inspection.