63results about How to "Increase the content of MgO" patented technology

The invention discloses a fireproof material for a mending furnace as well as a preparation method and a using method thereof. The fireproof material for the mending furnace comprises magnesia, magnesium powder, aluminium oxide, calcium oxide and sodium hexametaphosphate, wherein the total weight of the fireproof material for the mending furnace is used as a reference, the total content of the magnesia and the magnesium powder accounts for 80-90 percent by weight; the content of the aluminium oxide accounts for 3-7 percent by weight; the content of the calcium oxide accounts for 3-7 percent by weight; the content of the sodium hexametaphosphate accounts for 3-7 percent; and the main components of the magnesia and the magnesium powder are MgO. The fireproof material for the mending furnace is high in adhesive ratio, good in stickiness, solidification and hardness, and low in resilience value during mending; and therefore, a mending layer formed by the fireproof material for the mending furnace is good in anti-erosion performance and long in service life.

The invention discloses an electric furnace bottom ramming mass. The electric furnace bottom ramming mass contains the following raw materials in percentage by weight: 20-40% of 5-3mm fused magnesite or high-purity magnesite aggregate, 10-25% of 3-1mm fused magnesite or high-purity magnesite aggregate, 15-25% of 1-0mm fused magnesite or high-purity magnesite aggregate and 20-30% of <88 mu m fused magnesite fine powder or high-purity magnesite fine powder. Brine, which accounts for 4-6 wt% of the raw materials, is also added as a binder. The raw materials for producing the ramming mass combined with the brine are stable and easy to store. The ramming mass production process is simple, and the product quality is easy to control. The ramming mass has high MgO content, low impurity content, high fire resistance and higher corrosion resistance, and the service life can be prolonged from more than two hundred times to more than five hundred times in the electric furnace use process.

The invention discloses a flotation calcium-removing agent and method for magnesite. Hydrochloric acid, sodium phosphate, dodecylamine, sodium hydroxide, sodium silicate, sodium hexametaphosphate, oleic acid and FZ-8 are taken as flotation calcium-removing agents, and different scientific and reasonable agent formula systems are adopted at different flotation stages, so that calcium content of the magnesite can be lowered effectively; meanwhile, a process flow of combining reverse flotation and positive flotation and adding flotation agents with a reasonable formula segmentally is adopted, so that the calcium content of the magnesite can be lowered effectively; as proved by detection, the MgO content of concentrated magnesite obtained by the flotation calcium-removing method is over 99 percent, the total impurity content is lower than 1.0 percent, and the CaO content is lower than 0.80 percent. By adopting the flotation calcium-removing agent and method, the calcium removal rate can be increased effectively, and the quality of the magnesite is improved; moreover, the method is easy and convenient to operate, is simple in process, has contribution to popularization, and has a considerable application prospect.

The invention relates to the field of ferrous metallurgy technology and fireproof materials for ferrous metallurgy, in particular to a continuous casting tundish working layer coating. The invention has the following purposes: magnesite and boron mud are used as main base materials to invent a continuous casting tundish working layer magnesian coating without using silica powder, clay, active lime and other plasticizers, properties beneficial to a fireproof working layer, such as high MgO content, high fire resistance, high activity, high plasticity and the like, of the boron mud are fully utilized, and the boron mud is used for replacing the plasticizers used in the prior art, thus recycling the boron mud, improving the fire resistance, slag resistance and the like of the continuous casting tundish magnesian coating as well as prolonging the service life of the continuous casting tundish magnesian coating.

The invention discloses red mud composite binder for oxidized pellets. The red mud composite binder is prepared by waste red mud of aluminum plants, magnesite stone and humus binder. The red mud composite binder has characteristics of good hydrophily, excellent binding effect, low price, high iron content and the like. The granularity of the red mud composite binder is smaller than 200 meshes, partial weight ratio is larger than or equal to 90%, and water content is smaller than or equal to 1%. Therefore, the red mud composite binder can partially or totally replace bentonite to be used for producing the oxidized pellets. Compared with the technology completely utilizing the bentonite to produce the oxidized pellets, production rates of pellet TFe, sinter TFe and an ironmaking system are all improved, and slag quantity of a blast furnace is reduced. Besides, the content of MgO in the pellets is increased, so that the thermodynamic property of the pellets is good, and operation of the blast furnace is facilitated.

The invention discloses a converter final slag thickening method. The converter final slag thickening method includes the steps that firstly, after oxygen is blown for 10 minutes, gun pressing operation is conducted, in other words, the position of the gun is reduced by 200 mm, the oxygen pressure is kept between 0.75 MPa and 0.80 MPa, and duration is larger than 40 seconds; secondly, through a sampling laboratory test, and when the carbon content of molten steel is higher than the requirement of a smelting steel grade or the temperature of the molten steel is lower than the requirement of the smelting steel grade, reblowing treatment is conducted; thirdly, raw dolomite or lime is added so as to serve as a thickening material before steel is placed, and the addition amount of steel ranges from 2 kg/t to 5 kg/t. Through the optimization of converter end point gun pressing and reblowing, the FeO content of furnace slag is reduced, the metal yield is increased, the slag blocking success rate can be increased, the steel ladle slag amount is reduced, rephosphorization is reduced, the splashed slag furnace protecting effect can be improved, the furnace age can be prolonged, the slag amount requirement for slag residual operation is guaranteed, and lime consumption can be reduced.

The invention discloses the globe group chemic additive used in the mine, it is the powder duplicating mix compound. The granularity exceeds 200 items, the team element (the weight percent): the adding adhesive is 30-50%; the adding oxygen activator is 10-25%; the intensifying reagent is 10-25%; the carrier is 30-50%. The produced additive has not Si, AL, K, Na element which are harmful for the piddling. It can replace fully the expanding moist soil in producing the ball and is need to depress the quality of the globe group mine, the request of the quality can be reached and exceeded with the adding of the 0.4-0.6% additive in the globe group material, the ability of the metallurgy under the high temperature in the globe group material can be improved highly. The function of the additive exceeds the function of the expanding moist soil highly.

The invention relates to a purification process of high-purity magnesia. The process comprises the following steps of: performing water washing by using tailings and discarded fine ores with granularity smaller than or equal to 10mm produced in a magnesite exploitation process; adding a little light burning MgO powder to the water washed tailings and discarded fine ores and mixing and pressing to obtain a blank; naturally drying the blank, and light burning the dried blank with a tunnel kiln and a back reflection kiln, and placing the light burned blank into a Raymond mill for fine grinding; at the same time, performing centrifugal air classification purification, and pressing the blank into balls by a dry ball press after fine grinding and purification; and after maintenance and drying, putting the balls into a super-high temperature heavy oil vertical kiln for sintering to obtain a high-purity magnesia product, wherein MgO content is larger than or equal to 97%, and the volume density is larger than or equal to 3.3.g/cm<3>. Compared with the prior art, the purification process of high-purity magnesia has the beneficial effect that the process has the characteristics of low investment, simple process and obvious purification effect, and resources are rationally exploited and utilized, thus the existing problem of shortage of special grade magnesite ore is solved, and the process is very worthy of being popularized and utilized in the industry of magnesia refractory raw material production.

The invention relates to a method for reducing alkali metal enrichment in a blast furnace. When loads of in-furnace alkali metal oxides are 2.8 to 3.0 kg/t, the blast furnace carries out alkali removing once in each quarter, and the alkali removing period ranges from 15 days to 20 days; in the alkali removing period, the MgO content in slag of the blast furnace is controlled to be 7% to 8%, and the binary basicity of the slag of the blast furnace is controlled not to be larger than 1.15; in the alkali removing period, the temperature of molten iron in the blast furnace is controlled to be 1490 DEG C to 1500 DEG C; the Si content in the molten iron is controlled to be 0.3 percent to 0.35 percent; the Ti content in the molten iron of the blast furnace is controlled to be 0.1 percent to 0.15 percent. The basicity of the slag of the blast furnace is controlled, components and the temperature of the molten iron of the blast furnace are adjusted cooperatively, the discharge rate of the alkali metal is improved, and the alkali metal enrichment is reduced.

The invention belongs to the field of converter steelmaking systems, and relates to a method for controlling slag overflow in the converter tapping process. The method comprises the following steps that after converter blowing is finished, dolomite is added into a converter mouth through an overhead bunker; a converter oxygen lance is lowered to the position of 4 m, and high-pressure nitrogen is used for purging a slag surface for 20-30 seconds; after the slag surface is purged by the high-pressure nitrogen, the lance position of the oxygen lance is lifted, and the slag surface is purged for 10 seconds; and in the tapping process of a converter body, cooling slag pressing materials are added to the slag surface of a converter dispersedly through a cooling slag pressing material feeding vehicle right opposite to the converter mouth until tapping of the converter is finished. According to the method, slag overflow during steel tapping is controlled through the steps of adding the dolomite before steel tapping to reduce slag foaming, conducting gas purging for diluting the slag, adding the cooling slag pressing materials during steel tapping to press the slag and actively receiving the slag after slag overflow happens; and due to good slag overflow control, in the converter steel tapping process, the steps of forward pouring of the converter for temperature measurement, sampling and slag pouring can be omitted, the smelting time is saved by 2.5 minutes, and meanwhile, the production cost is reduced.

The invention relates to a preparation method of a super-efficient sewage dephosphorization adsorbent, and belongs to the technical field of sewage treatment and adsorbents. According to the method, based on a reaction that magnesium metal is combusted in a carbon dioxide atmosphere, MgO crystals and amorphous carbon are generated at the same time simply and quickly in one step; the two substancesare uniformly combined in a nanometer scale, so that the formed magnesium-based nano composite carbon material can be used as the super-efficient sewage dephosphorization adsorbent. The adsorbent hasextremely fast adsorption kinetics, a wide pH application range and relatively strong impurity anion interference resistance, the adsorption capacity of the adsorbent to phosphorus in a solution is higher than 1000mg/g, and the efficient and rapid phosphorus removal effect can be achieved in actual sewage with various complex components. The method disclosed by the invention is simple to operate,short in preparation period and rich and cheap in raw material source, and the adsorbent has no toxicity to the environment, does not cause secondary pollution during preparation of the adsorbent andphosphorus removal application, and has a very good application prospect.

The invention discloses a magnesium-rich alkaline sliding plate brick, comprising, by weight, 71-73% of 98 magnesium oxide, 5-9% of fused spinel, 3-6% of high-temperature combustion promoter powder, 3-4% of carbon black, 4-5% of 97 silicon carbide, 2-3% of aluminum powder, 2-4% of aluminum-magnesium alloy powder, and 2-3% of silicon powder, wherein all the components add up to 100% by weight, andalso comprising 4-5% of thermoplastic resin, and 0.4-0.5% of hexamethylenetetramine (urotropin). The invention is intended to provide a magnesium-rich alkaline sliding plate brick and a production method thereof to solve the problems that sliding plates in a steel plant have short lives, refractory steel has high consumption per ton, the cost needs to be reduced and resource waste needs to be reduced, and cost-reducing effect needs to be significant.

The invention relates to a method for preparing caring strengthened porcelain. The method comprises the following steps of: (A) adding magnesium-rich clay into pug for later use and selecting a porcelain aging- and structural stress-resistant mineralizer for later use; (B) adding the pug and the mineralizer for later use into a blank; and (C) performing mixing, ball milling, pug filtering, pug milling, molding, biscuit firing, polishing, glazing, glaze firing, decoration firing and sorting in turn to prepare a strengthened porcelain product. Through the process, the barrier of industrializing household talc porcelain is broken through, the problem of formability of the blank is effectively solved, a firing range is broadened, the problems of later aging and the like are solved, and by adopting a process route for producing high-grade porcelain, the technology and process for manufacturing the caring strengthened porcelain achieve and exceed that for producing worldwide recognized high-grade bone china.

The invention relates to a cement clinker employing a silica sand part instead of sandstone. The cement clinker is prepared from the following raw materials in parts by weight: 87-90% of limestone, 2.7-3.0% of alumina red mud and 6-9% of silica sand, sandstone and construction waste rocks, wherein the mass ratio of the silica sand to the sandstone to the construction waste rocks is 1:3:1. A technology specifically comprises the following steps of carrying out burdening, homogenizing, grinding, powder selecting, preheating and decomposing, and finally carrying out high-temperature calcination and then cooling to obtain the cement clinker. By adopting the scheme of replacing the sandstone with the silica sand part to produce the cement clinker, the grindability of raw meal mill is improved; meanwhile, a lot of industrial waste silica sand and construction waste rocks are consumed, so that effective utilization of resources is achieved; the firing quality of the clinker is improved, the firing energy consumption of the clinker is further reduced and the production cost.

The invention relates to a method for enriching magnesium-containing minerals in asbestos tailings. The method is characterized by comprising the steps of (1) crushing or grinding the asbestos tailings, and controlling the dissociation granularity to be -0.71mm; (2) controlling the graded cutting granularity to range from 0.105mm to 0.038mm, grading the crushed or ground asbestos tailings to obtain fine-fraction asbestos tailings and coarse-fraction asbestos tailings, and conducting flotation on the coarse-fraction asbestos tailings, wherein an inhibitor is modified carboxyl starch, and a collecting agent and foaming agent is an amphoteric collecting agent or a cationic collecting agent; and (3) grinding the fine-fraction asbestos tailings obtained through grading and flotation concentrate together to obtain minerals with the granularity of -0.105mm, conducting magnetic separation, and controlling the magnetic field intensity to be smaller than or equal to 4000Gs to obtain magnetite and the magnesium-containing minerals. The method has the beneficial effects that the process is simple and suitable for industrial production; and through a combined process, the magnesium-containing minerals in associated asbestos tailings such as serpentine, quartz, feldspar and magnetite can be effectively extracted, aluminum reduction and quartz removal are realized, and the grade of the magnesium-containing minerals is increased.