50results about How to "High arsenic removal rate" patented technology

The invention provides a method for treating poor-tin middling ore and recovering an iron-making raw material. The method comprises the following steps: adding an alkalinity modifier, a reducing agent and a chlorinating agent in the ore material for mixing so as to form a mixed material, and then pelletizing, wherein the alkalinity modifier is silicon-rich ore or quartziferous ore, the mass ratio of CaO/SiO2 in the mixed material is controlled to not more than 0.65, and the mass percentage of total SiO2 is not more than 10%; carrying out high temperature chloridizing roasting on pelletized aggregate pellets, wherein chloridizing roasting conditions are as follows: the addition amount of the chlorinating agent accounts for 4-8% of that of the aggregate pellets, and the addition amount of the reducing agent accounts for 3-5% of that of the aggregate pellets, and roasting temperature is 950-1100 DEG C; controlling the volume ratio of CO2/CO in the atmosphere to 1.0-3.0 in the roasting process; and carrying out cooling and dust collection on high-temperature smoke generated by chloridizing roasting, and then capturing and recovering valuable metals. By using the method in the invention, tin and other valuable metals are economically and efficiently extracted from the poor-tin middling ore and the iron-making raw material is recovered so as to finally achieve good effects as follows: (1) the extraction rate of the valuable meals in the poor-tin middling ore is improved; (2) the efficiencies of arsenic removal and iron-making material recovery are improved; (3) production capacity of equipment is improved, and energy is saved; and the like.

The invention relates to an arsenic-removing device and method for gallium arsenide wafer production and processing waste water and belongs to the technical field of waste water treatment. The arsenic-removing method comprises conveying raw water to a primary arsenic-removing tank, performing sequencing batch flocculation and sedimentation to remove arsenic, and enabling the basic process to comprise water inflow, flocculation, sedimentation and water outflow; enabling treated supernatant to enter a secondary arsenic-removing tank, first performing oxidation reactions, then performing sequencing batch flocculation and sedimentation to remove arsenic, and enabling the basic process to comprise water inflow, oxidation, flocculation, sedimentation and water outflow; first enabling the treated supernatant to flow into an intermediate tank, conveying the supernatant to a sand filter through a three-level lift pump to perform gravity filtration, enabling final outflow water to enter a clean water pond after filtration, and discharging the effluent finally; utilizing a backflushing pump to perform back flush on the sand filter at a fixed period, and taking backflushing water from the clean water pond. The arsenic-removing device and the arsenic-removing method are high in arsenic-removing rate, enable concentration of arsenic in the outflow water to be controlled to be below 0.02mg/L, are easy to operate, run stably, and are suitable for treating the gallium arsenide wafer production and processing waste water and arsenic-containing waste water of related industries.

The invention discloses a manufacturing method of refined high-purity yellow phosphor, which comprises the following steps: adding 20-30% yellow phosphor into 70-80% water in the sandwich insulating furnace; heating to fuse into liquid pattern; doping 8-15% carbonate; heating to 70-75 Deg C; stirring; washing through 75-80 Deg C; stewing; sedimenting; making arsenic content less than 0.2PPM and each impurity content less than 300PPM; refining to obtain 5-6N high-purity yellow phosphor.

The invention relates to a novel arsenic removal material and a preparation method thereof. The specific preparation raw materials include de-ionized water, ferric chloride, natural zeolite and a sodium hydroxide (NaOH) solution. When the material is prepared, the natural zeolite is taken as a base and the ferric chloride is loaded on the surface of the natural zeolite to obtain a natural zeolite-ferric chloride composite arsenic removal material. According to the preparation method provided by the invention, a prepared adsorbing material is high in adsorption efficiency, strong in alkali resistance and convenient for solid-liquid separation; and the novel arsenic removal material has the advantages of high adsorption efficiency, strong alkali resistance, convenience for solid-liquid separation, cheapness, easiness for obtaining, simple preparation method and good application prospect.

The invention discloses a proportioning method for high-arsenic smoke material for sublimation and arsenic removal. According to the method, reducing high-arsenic smoke and oxidizing high-arsenic smoke are respectively collected according to different production environments of the high-arsenic smoke material, and then the collected reducing high-arsenic smoke and the collected oxidizing high-arsenic smoke are mixed uniformly for serving as the high-arsenic smoke material for sublimation and arsenic removal according to the weight percentage ratio being 20-80% to 20-80%. After the reducing high-arsenic smoke and the oxidizing high-arsenic smoke are reasonably proportioned, the arsenic removal rate of sublimation and arsenic removal can be greatly increased, the metal separation rate of sublimation and arsenic removal can keep high, and large-scale and high-efficiency production can be realized. The method is simple, practicable and efficient; the arsenic removal rate can reach 70-80% through the method and is far higher than the sublimation and arsenic removal rate of single high-arsenic raw material or untargeted proportioning in the prior art.

The invention discloses an attapulgite kelp washing agent. The main points of the technical proposal are that the attapulgite kelp washing agent comprises an attapulgite clay, activity attapulgite clay, calvital and iron chloride. The manufacture method of the attapulgite kelp washing agent is that after the ingredients of the attapulgite kelp washing agent are mixed, the mixture is input to a flour mill for milling; the powder is packed into the finished products of the attapulgite kelp washing agent. The attapulgite kelp washing agent is used for cleaning kelp, which can increase the eduction of arsenic in the kelp. The attapulgite kelp washing agent has high rate of removing arsenic, short time of washing kelp, reaches food safety, has low loss of eating quality of the kelp, is beneficial to the softening of kelp meat quality, has fresh and cool taste. The attapulgite kelp washing agent is suitable for cleaning kelp and other seaweeds products.

A method for separating arsenic and recycling copper from arsenious high-copper dross comprises the following steps that (1) pretreatment, wherein the arsenious high-copper dross is screened, fine products and crude products are obtained, and the fine products are ground to be fine; (2) oxygen pressing acid leaching, wherein the fine products obtained in the step 1 are subjected to oxygen pressingacid leaching, and leachate and leaching residues are obtained; (3) oxygen pressing arsenic fixing, wherein siderite is added into the leachate obtained in the step 2 under the condition of oxygen pressure, and arsenic fixing after liquid and arsenic sedimentation residues are obtained; (4), cyclone electrodeposition, wherein the arsenic fixing after liquid is subjected to cyclone electrodeposition, electrodeposition after liquid and black copper residues are obtained, and after the black copper residues are cast through a pyrogenic process, crude copper is obtained. According to the method for separating arsenic and recycling copper from the arsenious high-copper dross, the siderite is used for arsenic removal, the acidity of a solution can be reduced, cost is low, and generation of ferric sulfate can be promoted; the solubility of iron arsenate can be reduced, the arsenic removal rate is high, no hydrogen is generated in the reaction process, and potential safety hazards caused by explosions are eliminated.

The invention relates to a preparation technology for an arsenic removal material. The arsenic removal material is prepared from deionized water, ferric chloride, natural zeolite and a sodium hydroxide (NaOH) solution. During preparation, natural zeolite is adopted as the basis, and after the surface is loaded with ferric chloride, the natural zeolite-ferric chloride composite arsenic removal adsorption material is obtained, the obtained adsorption material is high in adsorption efficiency, high in alkali resistance and capable of achieving solid-liquid separation conveniently, and the material is high in adsorption material, high in alkali resistance, capable of achieving solid-liquid separation conveniently, low in cost, easy to obtain and easy to prepare and has the good application prospect.

The invention discloses a method for arsenic removal of high-arsenic multi-metal complex materials and a device thereof. Microwaves are used as a heat source for arsenic removal of high-arsenic multi-metal complex materials, arsenic removal and agglomeration of materials needing to be agglomerated can be completed at the same time, materials which do not need to be agglomerated can be kept scattered after completion of arsenic removal, and the smoke volume and dust amount in the material treatment process can be reduced, so that the environment protection effect is obvious, arsenic can be efficiently enriched, and the arsenic removal rate can be effectively increased.

The invention aims to provide a high-efficiency arsenic poisoning carbon-based low-temperature denitration catalyst regeneration method, wherein a regeneration liquid comprises a cleaning liquid and an active supplementing liquid, the cleaning liquid contains nitric acid, a strong acid resistant penetrating agent OE-35 and deionized water, and the active supplementing liquid is prepared from manganese nitrate, cerium nitrate hexahydrate and water. According to the method, arsenic deposited on the surface of q catalyst can be effectively removed, the adopted regeneration liquid is easy to obtain and easy to prepare, the removal rate reaches 99.4% or above, and the denitration rate of the regenerated catalyst is recovered to a level close to that of the fresh catalyst.