30results about How to "Low slag production" patented technology

The invention belongs to the technical field of industrial wastewater treatment, and particularly discloses a method for removing arsenic from sulfate acidic wastewater. The method comprises the following steps that 1, the sulfate acidic wastewater is neutralized through a calcium carbonate suspension of 5 wt%-8 wt%, and solid-liquid separation is conducted after neutralization is conducted; 2, neutralized filtrate is neutralized again through a lime milk suspension of 5 wt%-8 wt%, solid-liquid separation is conducted, and more than 98% of the arsenic is removed in the process; 3, ferric sulfate or polymeric ferric sulfate flocculent settling is conducted, and flocculent settling is conducted on the filtrate in the second step to remove the residual arsenic. The method for removing the arsenic from the sulfate acidic wastewater is low in treatment cost and simple in operation condition, and the treated wastewater can reach a corresponding national emission standard; meanwhile, high-concentration arsenic residues can be obtained, and resource recycling or stabilizing or curing of the arsenic is facilitated.

The invention provides a converter multi-mode smelting method based on the molten iron classification system. First, the classification index of the molten iron is selected, the molten iron classification system is formulated, and the matching blowing mode is designed for the molten iron of different grades, and the molten iron is first obtained before charging. composition and temperature, and select the corresponding blowing mode to assist in the completion of smelting. The invention is based on the idea of ​​"differentiation" in mathematics, and classifies molten irons with relatively large fluctuations in composition. The molten irons falling in the same category can be regarded as stable, and the same blowing mode can be used to realize the stable blowing of the converter. It avoids blowing accidents caused by large fluctuations of molten iron, not only can improve the dephosphorization effect to a certain extent, but also can reduce material consumption, reduce slag production, shorten smelting cycle, and have good metallurgical effects.

The invention discloses a method for extracting copper and removing iron from acid leaching liquid of copper ore, which comprises crushing secondary copper oxide ore and secondary copper sulfide ore and mixing them for wet heap leaching; spraying and leaching with dilute sulfuric acid to obtain weak Acidic leaching solution; the leaching solution extracts copper through extraction or ion exchange to obtain copper-enriched solution and copper-poor solution; the copper-rich solution is electrolytically deposited to obtain cathode copper; the copper-depleted solution is continuously deironed at high temperature and high pressure under an oxidizing atmosphere, and the obtained pulp is passed through Hematite slag is obtained by filtration, and part of the copper-poor liquid is acidified and oxidized and sent to the storage yard for circular leaching. The present invention utilizes iron ions and copper sulfide ore to undergo oxidation-reduction in the heap leaching process, and the iron ions in the heap leaching solution mainly exist in the form of divalent iron ions, which eliminates the step of reducing divalent iron ions for the subsequent extraction of copper, and adopts high temperature The high-pressure method of iron removal has a small amount of slag production and low environmental protection pressure, and the iron slag can be reused; the sulfuric acid produced in the iron removal process does not need to be neutralized, and can be directly returned to the heap leaching for recycling, and the comprehensive utilization effect is good.

The invention relates to a preparation method of vanadium-iron alloy, belongs to the field of metallurgy, and in particular relates to a preparation method of vanadium-iron alloy. The method of the present invention takes the mixture containing vanadium oxide as raw material, adopts the method of adding material in three stages and removing slag twice, prepares the mixture respectively according to the first, second and third stages, and adds the prepared mixture in stages The smelting is carried out in an electric furnace, and the slag is discharged once after the first phase and the second phase of smelting are completed; the vanadium oxide includes V2O3 and V2O5, and the mass ratio of V2O3 and V2O5 is 7:1-0:8. The method can not only reduce the loss of vanadium in the slag, increase the yield of ferrovanadium smelting, but also reduce the consumption of aluminum, and has a good application prospect.

The invention relates to a preparation technology of chromate, specifically to a three-phase catalytic oxidation preparation technology of soluble chromate. The technology comprises the following steps of: heating alkali liquor with concentration of 20-60% to 50-300 DEG C, then, mixing chromite or carbon ferrochrome with the alkali liquor according to mass ratio of Cr2O3 : alkali liquor = 1 : 1.5-10 to form suspending liquid, and introducing the suspending liquid into a reactor; continuously inputting the air or the oxygen heated to 50-300 DEG C to the bottom of the reactor through a pipeline; setting a catalyst in the reactor according to the mass ratio of catalyst : Cr2O3 = 0.1-1.5 : 100, maintaining the temperature of the suspending liquid in the reactor at 50-300 DEG C, executing gas-liquid-solid three-phase bubbling reaction for 0.5-6 hours to generate soluble chromate raw products and chromium residues; removing impurities through filtering and crystallization to obtain the chromate. With the three-phase catalytic oxidation preparation technology of the soluble chromate, Cr2O3 conversion rate is high, reaction speed is fast, energy consumption is low, residue quantity is low, environment pollution is less, equipment investment is low and corrosion is low.

The invention discloses a method for preparing sodium chromate by mixing chromite and ferrochrome and a device for the method. The method comprises the following steps: measuring and mixing chromite and ferrochrome with sodium carbonate, sodium nitrate and sodium peroxide; pelleting the mixture with extracted liquid sodium chromate in a pelletizer; drying in a drier; returning part of the clinker to a flame kiln after the material is dried and cooled, so that chromite and ferrochrome are decomposed and oxidized in the form of fused liquid phase in molten salts so as to obtain the clinker of sodium chromate; and continuously soaking, filtering and cleaning after the clinker is cooled so that a chromium chemical primary product of liquid sodium chromate is obtained, wherein the flame kiln comprises a U-shaped kiln body, a partition wall and a low-position molten salt suction port, wherein the partition wall and the low-position molten salt suction port are arranged in the U-shaped kiln body; one or more blowing oxygen lances and one or more charging holes are arranged at the top of the kiln body, and a smoke outlet is arranged on the upper side of the kiln; and one or more oxygen lances are arranged at the bottom of the kiln. According to the method disclosed by the invention, the oxidation rate is as high as 98%, the clinker extraction rate is as high as 99.97%, and the chromium yield is 97.96%.

The invention discloses a plating control method. In the process that strip steel is separated from the solution surface of a plating solution, plating solution brought out of the solution surface by the strip steel is subjected to ultrasonic vibrating treatment through ultrasonic waves at first, and then jetting treatment is conducted through an air knife device. A curved surface of the plating solution brought out of the solution surface by the strip steel is formed between the strip steel and the solution surface, and the ultrasonic wave acts on plating solution within the range of the curved surface. The viscosity of nonferrous liquid metal is lowered through an ultrasonic device, and the splatter effect of liquid metal adhered to the strip steel surface is produced through the vibration produced by the ultrasonic wave in the liquid metal, so that a part of liquid metal is automatically stripped from the strip steel surface and the weight of nonferrous liquid metal brought out by the strip steel in operation is lowered. The accurate control over the thickness of plating can be achieved through the air knife scraping device with low gas pressure and flow. The slag production amount is greatly reduced; the pollution of noise and dust is also reduced; the design and manufacturing cost of an air knife is reduced; the problem of plating of thin plating in high speed condition is solved.

The invention relates to a method for treating arsenic-containing organic wastewater, comprising the following steps: (1) adjusting the pH of the arsenic-containing organic wastewater to 2 to 4, allowing the pH-adjusted wastewater to flow through a nano-iron particle generating device to make the nano-iron particles The iron particle generation device generates nano-iron particles in situ in wastewater; (2), adding H to the wastewater added with nano-iron particles 2 o 2 Carrying out the nano-iron / heterogeneous Fenton oxidation reaction until the reaction is completed; (3), adjusting the pH of the mixed liquid after the reaction to 8-9, and arsenic ion flocculation and precipitation are separated from the waste water. The treatment method of the invention has good effect on removing arsenic and COD from the arsenic-containing organic wastewater, and can meet increasingly stringent arsenic discharge standards.

The invention discloses a molten iron pretreatment compound dephosphorization agent with converter slag as the raw material, and the compound dephosphorization agent contains the following raw materials by weight: 45 to 55 percent of converter slag, 3 to 5 percent of quartz sand, 22 to 34 percent of steel-rolling iron sheet, 3 to 6 percent of bauxite, 10 to 14 percent of soda and 0 to 5 percent offluorite; the raw materials meeting the ingredient demands are evenly mixed according to the proportions after being crushed, and then the product with the diameter being 20 to 50mm is produced afterball-milling, screen separation, palletizing and drying. The compound dephosphorization agent realizes cyclic utilization of the converter slag which accounts for 45 to 55 percent, thus reducing theproduced slag amount in the steel-making process and the environmental load; the converter slag contains plenty of CaO and FeO, which can reduce consumption of lime to a certain degree, thus increasing the metal yield rate and reducing the steel-making cost; the compound dephosphorization agent has low melting point, slag can be formed fast, the liquidity is good, thus shortening the treatment time, the dephosphorizing efficiency is high, and the dephosphorized final slag has low alkalinity and low melting point.