50 results about "Hydrochloric acid regeneration" patented technology

The invention provides a method for the regeneration of waste hydrochloric acid by oxygen enriched roasting. The method is characterized in that: air separation technology is adopted to separate air to extract enriched oxygen of which the purity is 22 to 95 percent, and the enriched oxygen is used to replace air to serve as the roasting combustion-supporting gas in the roasting treatment for the oxygen enriched roasting of the waste hydrochloric acid. The method has the advantages of greatly improving treating ability of a waste acid regenerating device, lowering energy consumption of the system, and lowering production cost of regenerating the waste hydrochloric acid.

The invention relates to a method for reproduction and utilization of hydrochloric acid in the process of extracting nickel and cobalt from laterite nickel ore. A chlorination treatment process of laterite nickel ore by wet method comprises the steps of preparing laterite nickel ore, leaching out chloride, concentrating leaching solution, precipitating by sulfurization, recovering hydrochloric acid, etc. The calcinating materials in the inventive hydrochloric acid reproduction process comprise the concentrated solution of the mother liquid after nickel precipitation, iron chloride and magnesium chloride crystals obtained during concentration of the leaching solution, and coal powder. The inventive method comprises the steps of mixing and blending materials to obtain slurry, and spraying into a high-temperature furnace, or calcinating the materials in high-temperature furnaces at 500-800DEG C, hydrolyzing metallic chloride into hydrogen chloride and metal oxide, heating the concentrated leaching solution by using the residual heat from the hot furnace gas, and absorbing the hydrogen chloride to reproduce hydrochloric acid, so as to realize closed circuit circulation of the hydrochloric acid. The high-viscosity ferric oxide and magnesium oxide dregs are cooled, broken and pulverized to powder, which is used as a byproduct for treatment. The inventive method improves the conversion rate and equipment productive capacity during chloride reproduction process, reduces energy consumption in hydrochloric acid reproduction, and realizes comprehensive utilization of the residual heat in hydrochloric acid reproduction.

The invention belongs to the field of waste acid regeneration recycling, and more specifically relates to a concentrated hydrochloric acid recycling mechanism used for hydrochloric acid regeneration.The concentrated hydrochloric acid recycling mechanism used for hydrochloric acid regeneration comprises a roasting furnace, a feeding mechanism, a fixed supporting mechanism, a condensation mechanism, a collecting mechanism, a roasting mechanism, a shocking mechanism, and a driving mechanism; the feeding mechanism which is used for introducing waste acid liquid into the roasting furnace is connected with the top end of the roasting furnace; the roasting mechanism which is used for roasting waste acid liquid after atomization is arranged at the bottom of the inner cavity of the roasting furnace; the roasting mechanism comprises fixing rods, a fixing pedestal, an electric heating plate, a dust falling plate, and first springs; the shocking mechanism which is used for shocking down of iron powder particles formed on the surface of the dust falling plate after waste acid liquid roasting evaporation is arranged in the fixing pedestal; and the driving mechanism which is used for generatingcompressed air to push an impacting block to impact the dust falling plate is arranged in the fixing pedestal. The concentrated hydrochloric acid recycling mechanism can be used for shacking and collecting iron powder formed on the surface of the dust falling plate, and preventing environment pollution.

The invention relates to a method for hydrolyzing cellulose through cooperation between freezing pretreatment and straw carbon-based solid acid, belonging to the technical field of cellulose hydrolysis methods. The invention aims to solve the problem of low hydrolysis efficiency of cellulose catalyzed by solid acid. The method for hydrolyzing cellulose through cooperation between freezing pretreatment and straw carbon-based solid acid comprises the following steps: performing freezing pretreatment on cellulose in an environment with a temperature of -18 to -30 DEG C, performing regeneration through hydrochloric acid to obtain regenerated cellulose with low crystallinity, hydrolyzing the regenerated cellulose by using straw carbon-based solid acid obtained by carbonizing and sulfonating crop straws as a catalyst, and efficiently converting the cellulose into reducing sugar. According to the invention, the crystallinity of the cellulose obtained through pretreatment is reduced, a contactarea of the cellulose and the catalyst can be effectively increased, and the straw carbon-based solid acid prepared through the method is high in surface acid content and high in catalytic activity and can remarkably improve the hydrolysis efficiency of the cellulose. When the method is applied to northern cold regions, pretreatment cost can be further reduced.

The invention provides a spray roasting hydrochloric acid regeneration method and system for ferric oxide powder with a high specific surface area. The method comprises the steps: a waste acid solution is heated and concentrated in a pre-concentrator and then is sprayed into a roasting furnace through a feeding pipeline of the roasting furnace; the generated roasting flue gas is subjected to subsequent regeneration treatment and purification treatment, the waste acid solution is divided into a first pipeline and a second pipeline which are independent before entering the preconcentrator, the waste acid solutions in the first pipeline and the second pipeline respectively enter the roasting furnace and the preconcentrator, and the waste acid solution entering the preconcentrator is heated and concentrated and then is mixed with the waste acid solution in the first pipeline, and then the mixed solution enters the roasting furnace. On the basis of not reducing the treatment capacity of a conventional spray roasting hydrochloric acid regeneration system and not increasing the energy consumption, the waste acid solution is divided into two paths to respectively enter the roasting furnaceand the pre-concentrator, and a certain amount of waste acid is added into the feeding pipeline of the roasting furnace, so that the concentration of the concentrated acid for firing in the roastingfurnace is remarkably reduced, and the purpose of increasing the BET value of the produced ferric oxide powder is achieved.

The invention relates to a quick recovery treatment method of common carbon steel hydrochloric acid pickling waste liquid, and the method comprises the following steps: 1) adding a certain proportionof organic acid additive into pickling waste liquid containing a large amount of ferrous ions, and sufficiently stirring at constant temperature to obtain a solid-liquid mixture; 2) carrying out solid-liquid separation on the solid-liquid mixture by adopting a vacuum circulating water pump to obtain a metal organic acid precipitate of iron and other trace metal elements and a hydrochloric acid solution; 3) directly adding the hydrochloric acid solution into a common carbon steel washing section for cyclic utilization; and 4) performing high-temperature calcination and drying on the obtained metal organic acid salt in a muffle furnace to obtain the metal oxide. The method effectively solves the problems of high recovery cost, low concentration of recovered hydrochloric acid, easy generationof secondary pollution and the like in the existing hydrochloric acid waste liquid treatment technology, realizes hydrochloric acid regeneration cycle and metal oxide added high value, and has high environmental protection benefit and economic benefit.

The invention discloses an anion exchange resin recovery process applied to biological extraction. The anion exchange resin recovery process comprises the following steps: sampling 400ml of invalid anion exchange resin for nucleotide separation, and loading into an ion exchange column; preparing 800ml of regenerant and storing in a storage tank; circularly soaking for 24 hours by using the regenerant in volume of 1-4 times that of the resin; after soaking, washing with water with the volume 4-8 times that of the resin, and regenerating with 1-2 mol / L HCL and 1-2 mol / L NaOH respectively; and performing static adsorption inspection on the adsorption effect of the regenerated resin. According to the invention, the use frequency of the anion exchange resin can be increased from 30 times to 100 times; according to the invention, the polluted resin is continuously used after being treated, so that the generation of solid waste is reduced; after the anion exchange resin is treated by the method, the resin cost can be reduced by 50% every year; common regeneration methods include acid regeneration, alkali regeneration, salt regeneration, alkali salt regeneration and the like, while alcohol regeneration and alcohol and hydrochloric acid regeneration are adopted in the method, so that the regeneration effect is remarkably improved.

The invention provides an automatic dosing method and device for hydrochloric acid regeneration desilication flocculant. The method comprises the following steps: collecting the actual volume flow rate of waste acid, the pH value of the waste acid, the temperature of the waste acid and the actual dosing volume flow rate of flocculant; according to the target concentration of the flocculant in a flocculation tank and the collected actual volume flow rate of waste acid, pH value of the waste acid, temperature of the waste acid and actual dosing volume flow rate of the flocculant, calculating the required dosing volume flow rate of the flocculant; and then, comparing the required dosing volume flow rate of the flocculant and the actual dosing volume flow rate of the flocculant, controlling the rotation speed of a flocculant dosing pump to enable the two dosing volume flow rates to be the same if the two dosing volume flow rates are different, thereby realizing the automatic control and real-time regulation on the dosage of the flocculant. Thus, the problems of oversized or undersized flocculant dosage, unbalanced flocculant dosing concentration, untimely concentration regulation and the like caused by the existing manual intervention control are avoided.

The invention discloses a preparation method of ludox for an acrylonitrile catalyst. The method comprises: adding sulfuric acid aqueous solution into industrial sodium silicate aqueous solution with a silicon dioxide content of 3-5 wt percent until pH is 9.0-9.5, heating up to 90-95 DEG C, and then keeping warm for 1-2 hours to form ludox base solution; adding water into industrial sodium silicate with a modulus of 3.0-3.3, preparing aqueous solution with a silicon dioxide content of 3-5 wt percent, suspending cation exchange resin by using deionized water, then adding sodium silicate and controlling outlet pH to be 2-3 after ion exchange to obtain silicic acid, adding the silicic acid into the prepared ludox base solution at a speed of 100-200ml / min, keeping pH to be 9-9.5, keeping warm for 1-2 hours under the temperature of 90-95 DEG C, and then cooling to normal temperature; performing ion exchange on a product by using strong-acidity cation exchange resin regenerated by hydrochloric acid, meanwhile keeping pH to be 1-2, and after exchange, adding ammonium hydroxide and adjusting pH to be 9-9.5; finally adding a dispersing agent into the prepared ludox, and performing ultrafiltration and concentration to obtain the ludox. The prepared ludox has the mean grain size of 20-25nm, the sodium ion content less than 0.05 percent, the concentration of 40-50 percent and the viscosity less than 20cps.