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 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 method for treating arsenic in waste smelting acid by using copper slag, and belongs to the field of heavy metal pollution treatment and metallurgical solid waste utilization. The method includes firstly subjecting the copper slag to drying, ball milling and magnetic separation to obtain iron-rich copper slag and other impurities; subjecting the iron-rich copper slag to high-temperature pretreatment at 500-800 DEG C; subjecting the high-temperature iron-rich copper slag to water quenching through high-speed water blowing; then drying and grinding the copper slag afterwater quenching; adding H2O2 into waste acid and mixing to perform oxidation pretreatment at 60-80 DEG C; then adding the copper slag into the waste acid after oxidation pretreatment; performing an arsenic removing reaction at atmospheric pressure under stirring; and finally performing solid liquid separation. The method achieves arsenic removal with cheap copper slag, reduces sludge storage volume in the process of waste acid treatment when compared with a traditional arsenic removal process, and achieves an effect of treating waste with a waste material. The method has characteristics of simple process operation, a low production cost and a wide market prospect.

The invention provides a converter multi-mode smelting method based on a molten iron grading system. The converter multi-mode smelting method comprises the following steps: firstly, selecting grading indexes of molten iron, formulating the molten iron grading system, designing blowing modes matched with different grades of molten iron according to the different grades of molten iron, firstly obtaining components and temperature of the molten iron before charging, and selecting the corresponding blowing mode to assist in completing smelting. According to the method, the molten iron with large component fluctuation is classified based on the 'differential' thought in mathematics, the molten iron falling into the same category can be regarded as stable, the same blowing mode is adopted, stable blowing of the converter can be achieved, blowing accidents caused by large fluctuation of the molten iron are avoided, the dephosphorization effect can be improved to a certain degree, and material consumption can be reduced, the slag production amount is reduced, the smelting period is shortened, and the good metallurgical effect is achieved.

The invention relates to a treatment method of arsenic-containing organic wastewater, which comprises the following steps: (1) regulating the pH value of the arsenic-containing organic wastewater to 2-4, and enabling the pH-regulated wastewater to flow through a nano-iron particle generation device, so that the nano-iron particle generation device generates nano-iron particles in situ in the wastewater; (2) adding H2O2 into the wastewater added with the nano-iron particles to carry out nano-iron/heterogeneous Fenton oxidation reaction until the reaction is finished; and (3) adjusting the pH value of the reacted mixed solution to 8-9, and separating out the arsenic ion flocculent precipitate from the wastewater. The treatment method provided by the invention has good arsenic removal and CODremoval effects on arsenic-containing organic wastewater, and can meet increasingly strict arsenic discharge standards.

The invention discloses a convenient-integrated paint spray wastewater treatment and reuse system and method. Sewage is sequentially treated by the following equipment: a wastewater collection and regulation tank for sewage storage and water quality stabilization, a neutralization and coagulation sedimentation device which is connected with a dosing device, a buffer tank for storing supernate treated by the neutralization and coagulation sedimentation device, and a mechanical filter, wherein precipitate is dewatered and dried by a plate and frame filter press, and the supernate is stored in aclear water tank after filtering. The system and method meet the reuse water standard in the production link of enterprises.

The invention discloses a method for producing electrolytic manganese metal by lixiviating sinter ore by adding ferrous sulphate in replacement of manganese carbonate ore. The method comprises the working procedures of lixiviation and oxidation, neutralization, filtration, purification, electrolyzation and the like, and is characterized in that the process of lixiviation and oxidation is implemented by injecting anolyte enough to lead the material to react into the lixiviation vessel, adding concentrated sulfuric acid, adding sinter ore and finally adding ferrous sulphate for lixiviation for 3-4 hours at 70-75 DEG C; adding ammonia water immediately when Fe2+ in the feed liquid is less than or equal to 0.001g/l so as to carry out neutralization, testing the pH value of the feed liquid several times during the process of neutralization, and stopping adding ammonia water when full-valent Fe up to standard is less than or equal to 0.001g/l and the pH value reaches 6.8-7.2. The invention can reduce production cost, and solve the difficulty in purchasing manganese carbonate ore. The sinter ore contains high grade manganese, therefore, ore input quantity is small, and correspondingly the slag quantity and fee liquid carried away by the slag are little. No carbon dioxide gas is exhausted during lixiviation with sinter ore as raw material, thus working environment is improved.

The invention discloses an oxygen blowing and coal injection secondary lead smelting furnace and an oxygen blowing and coal injection method, and belongs to the technical field of non-ferrous metal smelting. A discharge hole in the bottom of a coal injection tank is connected with a coal injection machine; the inlet end of the coal injection machine is connected with the gas outlet port of a gas storage tank, the outlet end of the coal injection machine is connected with a pulverized coal inlet of a coal injection oxygen lance through a coal injection pipe, and the coal injection oxygen lance is inserted into a smelting furnace body; a gas outlet port of the gas storage tank is communicated with the coal injection tank, and a gas inlet port of the gas storage tank is connected with an air compressor through an air storage pressurizing valve; an upper sealing top of the coal injection tank is also connected with a coal feeding valve, a pressure gauge and a gas inlet valve, and the upper inlet end of the coal feeding valve is connected with a coal hopper; an oxygen station is connected with an oxygen inlet of the coal injection oxygen lance; and the gas outlet port of the gas storage tank is connected with a compressed air inlet of the coal injection oxygen lance. The oxygen blowing and coal injection secondary lead smelting furnace has the advantages of simple structure and low manufacturing cost; combustion is more complete, and the smelting efficiency is improved; and the pulverized coal goes deep into molten liquid slag to accelerate the decomposition of lead sulfate, so that the consumption of scrap iron or iron ore is greatly reduced, and the slag yield is reduced.