44results about How to "Eliminate environmental hazards" patented technology

The invention discloses a dearsenication method of arsenic-containing soot in a pyrogenic smelting process of lead, copper, tin or the like. The method comprises the following steps: calculating the amounts of concentrated sulfuric acid and coal powder required by each ton of soot according to the arsenic content according to the following components in percentage by weight: 1% of As, 0.10-1.50% of concentrated sulfuric acid and 0.10-0.50% of coal powder; and evenly mixing the soot, concentrated sulfuric acid and coal powder; reduction roasting: adding the prepared raw materials into an electrothermal converter, starting a dust collection blower, heating to 300-450 DEG C, carrying out rotary roasting for 1.5-3 hours, and discharging; and leaching the dearsenicated roasted product in an indium recovery system to leach zinc and indium, and extracting to recover the indium. The reduction roasting is adopted to directly convert the arsenic into the finished product arsenic white, thereby avoiding the problem of stacking of the arsenic-containing slag and eliminating the hidden danger of environmental protection caused by stacking of the arsenic-containing slag. By adopting the sulfating roasting, the indium can be conveniently recovered, the leaching rate of the acidified soot is enhanced, and the recovery rate of indium can reach 95% above.

Systems and methods for capturing waste are disclosed. The systems and methods provide for a high level of confinement and long term stability. The systems and methods include adsorbing waste into a metal-organic framework (MOF), and applying pressure to the MOF material's framework to crystallize or make amorphous the MOF material thereby changing the MOF's pore structure and sorption characteristics without collapsing the MOF framework.

The invention relates to a process for jointly producing cyanuramide, sodium carbonate and ammonium chloride by using carbamide, which comprises the steps of producing the cyanuramide, refining bittern or brine and absorbing tail gas, acidulating sodium bicarbonate to separate base out, separating the sodium carbonate, decomposing, rectifying and denitrifying the mother liquor of the sodium bicarbonate, steaming and concentrating deamination liquor to separate sodium chloride, and separating ammonium chloride from the clear solution of salt. The total utilization of the carbamide can be up to 100 percent, the tail gas and considerable afterheat and steam generated in the cyanuramide production process can be fully utilized and the energy is saved.

The invention relates to an electronic industrial wastewater near zero release water treatment process. A basic solution directly enters a water tank to be stored, and a physical and chemical agents is added into the water tank once every month; the basic solution treated in the second step is conveyed into a storage water tank through a pipeline, and the basic solution sequentially enters a PAC adjusting pond and a PAM adjusting pond through a lifting pump; the basic solution treated in the third step enters an MBR through a pipeline, and clear liquid obtained after membrane separation through the MBR enters a filter; filtrate enters a clear water tank through a pipeline, the filtrate is sequentially conveyed into a primary one-segment RO and a nanofiltration system to be filtered by the clear water tank through a pipeline, concentrated liquid separated by the nanofiltration system is recycled to the clear water tank through a pipeline, clear liquid separated by the nanofiltration system enters a secondary RO to be separated through a pipeline, and clear liquid separated through the secondary RO enters denitrification resin to be reused. Effluent reaches or is superior to corresponding water use indexes, and a treatment facility can run stably and reliably for a long time. By the adoption of the reasonable and effective treatment process technology, the economical efficiency, reasonability and effectiveness of overall construction investment are guaranteed, and meanwhile the running and using cost is reduced to the greatest extent.

This invention relates to one method to pre-mix fuel for chlorofluoromethane and its materials, which comprises the following steps: mixing the reactor chlorofluoromethane, water, fuel and air for heating up to improve reaction molecule energy and to improve fuel heating speed; mixture gas pre-heating makes burst furnace temperature lift helpful for back reactions; using fuel tail fuel gas and air to improve flare transmission speed and temperature to add burst intensity and to improve device heat efficiency.

The invention relates to the technical field of industrial harmful waste recycling, and discloses a stainless steel cold rolling sludge recycling method which comprises the following steps of: (1) carrying out distinguishing treatment; (2) carrying out mixing treatment; (3) carrying out primary precipitation; (4) obtaining heavy metal sludge; (5) carrying out secondary precipitation; and (6) obtaining calcium salt sludge. According to the stainless steel cold rolling sludge recycling method, through two-stage treatment and segmented recovery, a heavy metal sludge cake and a calcium salt sludgecake are obtained conveniently, the heavy metal sludge cake is mainly composed of hydroxides of heavy metals such as Fe, Cr and Ni, the heavy metal sludge cake can be returned to a metallurgy processand utilized as a steelmaking slag former or sinter or pellet ore and other raw materials after being dried, the calcium salt sludge cake can be used as a cement mineralizer, a building material rawmaterial or a metallurgical auxiliary material, and can also fill up the landfill or be stacked as common industrial waste due to low heavy metal content, and practice shows that after the stainless steel cold rolling pickling wastewater is subjected to segmented treatment, mixed sludge source reduction is realized, and two sections of sludge are easier to comprehensively utilize.

The invention relates to an environment-friendly RH refining furnace lining brick and a preparation method thereof. The environment-friendly RH refining furnace lining brick is prepared from the following raw materials in percentage by weight: 54-81% of magnesite, 18-35% of magnesium aluminate spinel ultra-fine powder, 0.5-9.5% of alpha-aluminium oxide ultra-fine powder and 0.5-1.5% of modified graphene, wherein the sum of the percentage by weight of the raw materials is 100%; in addition, the environment-friendly RH refining furnace lining brick also comprises 3-5% by weight of aluminium sulfate serving as a binding agent. The preparation method comprises the following steps: weighing the raw materials in proportions, and premixing the raw materials with the particle size of less than or equal to 0.088mm so as to obtain a premixed material; then stirring the raw materials with the particle size of more than 0.088mm for 3-5 minutes, adding the aluminium sulfate binding agent and stirring for 3-6 minutes, adding the premixed material and stirring for 6-15 minutes, carrying out compression molding under the pressure of 100-300MPa, and finally carrying out heat treatment in an electric heating dry kiln at the temperature of 100-300 DEG C, thus forming the RH vacuum furnace lining brick. The preparation method has the advantages that the non-chromizing of a lining of RH vacuum smelting equipment is realized, the environment hidden danger caused by a chrome-containing refractory lining is eliminated, and the environment-friendly RH refining furnace lining brick with the good performance can be prepared.