30 results about "Cyanide level" patented technology

The invention discloses a method for removing iron and cyanide by mixing copper-containing wastewater and cyanide-containing wastewater, which specifically includes the following steps: mixing copper-containing acid wastewater and cyanide-containing wastewater, and adding an appropriate amount of ferrous sulfate; Polyacrylamide is added to carry out flocculation and sedimentation, the supernatant is adsorbed with resin, underflow filtration, and the filter residue is washed; S3, add dilute sulfuric acid to the filter residue and inflate, add potassium ferrocyanide and the surfactant zinc naphthalate to the solution after dissolution, Generate china blue dye; S4, for the filtrate, use resin to absorb copper and resin to absorb zinc, and use sulfuric acid solution to desorb copper and zinc respectively; S5, for the liquid after adsorption, adjust its pH to 6-7, pass chlorine dioxide The remaining total cyanide content was reduced to 0.5 mg / L before efflux. The method of the invention has low cost, can produce products with sales value, and can effectively recover metal ions in copper-containing acid wastewater and remove cyanide in cyanide-containing wastewater.

The invention relates to the field of biological technology, in particular to a method for reducing the cyanide content of cassava dregs, which is characterized in that: mixing yeast and Mucor actinosa according to a volume ratio of 1-5:1-3 to obtain a mixed bacterial liquid, and then Mix 10-20mL of the mixed bacterial solution with 180-250g of cassava residue, and ferment at 25-31°C for 48-96h. The method is simple and easy to implement. The method of microbial degradation can not only greatly reduce the content of hydrocyanic acid, the rate of cyanide reduction can reach more than 80%, improve the safety of cassava residues as feed, but also decompose hydrocyanic acid and convert it into non-toxic Toxic organic matter becomes the nutrient of the feed and increases the economic benefits of the safe utilization of cassava residues.

The invention discloses a method for detecting the content of hydrogen cyanide and cyanide. According to the method, CV (Cyclic Voltammetry) for directly measuring the concentration of the cyanide ina sample is established; then, measuring is performed by using differential pulse voltammetry; the content of the hydrogen cyanide and the cyanide is detected in a three-electrode system which takes acomposite membrane-modified glassy carbon electrode as a working electrode, a platinum wire electrode as an auxiliary electrode and a saturated calomel electrode as a reference electrode; the sampleis subjected to quantitative analysis by adopting a standard curve method to obtain a result. The method comprises the following steps: (1) preparing a sample; (2) preparing a standard solution; (3) detecting. The method is easy to operate, high in accuracy, high in sensitivity and high in specificity.

A device and a method of analyzing total cyanide in water samples, including a mixing tube, a stripping tube, a sampling pipe, a reaction pipe, a peristaltic pump, an air pump, a UV digester, a heater, a condenser, a drain pipe and a water sample detector. The mixing tube, the stripping tube, the sampling pipe and the reaction pipe are respectively connected to the peristaltic pump. The mixing tube is connected to the reaction pipe. A bottom of the stripping tube, the air pump, the UV digester, the heater and the condenser and are sequentially connected. The condenser is connected to the mixing tube. An upper portion of the stripping tube, the sampling pipe and the reaction pipe are connected to the drain pipe. An absorbance of the water in the mixing tube is measured by the sample detector, and used to calculate the total cyanide content by spectrophotometry.

The invention discloses a treatment method for cyanidation gold extraction wastewater. The silicon-based acid solution is prepared by using sodium silicate and hydrochloric acid solution; the cyanide gold extraction aluminum-containing wastewater is prepared by using aluminum chloride and cyanide gold extraction wastewater; Acid solution and cyanide gold-extracting aluminum-containing wastewater to prepare cyanide-extracted gold-containing silicon-aluminum acidic water; low-temperature plasma irradiation is carried out on cyanide-extracted gold-containing silicon-aluminum acidic water to obtain polysilicon-aluminum precursor solution; polysilicon-aluminum precursor solution The bulk solution is irradiated with low-temperature plasma to obtain a silicon-based flocculant. The waste water treatment process of the present invention is simple, and the sources of required raw materials are extensive. The minimum total cyanide content in the flocculant prepared by using cyanidation gold extraction waste water is only 0.04 mg / kg, and the flocculant prepared at the same time is applicable to water with pH=1-13 Environment, heavy metal removal rate is high, the highest can realize the removal of 99% lead, 98% mercury, 98% cadmium, 99% zinc, 99% copper in the simulated liquid, it is very important to solve the problems existing in the current cyanide gold extraction wastewater treatment process Especially critical.

The invention discloses a rapid detection method for cyanide content in nuts, and belongs to the technical field of food analysis and detection. The invention adopts the optimization of the formula of the buffer salt system and the extractant and the adsorbent for the pretreatment of QuEChERS, combined with the detection by the spectrophotometry, reacts with the chloramine T, CN ‑ It is converted into cyanogen chloride, and then reacts with isonicotinic acid-barbituric acid to generate a violet-blue dye. The absorbance is measured by a spectrophotometer, and the cyanide content in the sample is quantified by combining with the standard curve method. The detection method established by the invention can realize the rapid batch pretreatment of samples with low sample volume, has low requirements on instruments and equipment, can effectively improve the detection efficiency, and has the advantages of rapidity, economy and wide applicability.

The invention discloses a method for measuring soil cyanide and total cyanide. The pH value of a soil sample is adjusted to be alkaline, a soil sample without impurities is prepared, and the soil sample is weighed quantitatively; It is used for continuous flow analyzer to determine the concentration of cyanide or total cyanide in soil. Using soil sample distillation and continuous flow analyzer to measure the total soil cyanide content can eliminate interference, avoid damage to the instrument, make it safer for the testing personnel, and help protect the analysis equipment from damage. At the same time, the testing work is more efficient. Using low-temperature drying, electrostatic adsorption, sieving, etc., can obtain more standardized soil samples, avoid the influence of metal impurities and organic impurities on the measurement results, and adjust the soil to alkaline before drying to ensure , No cyanide overflow, fully guarantee the precision and accuracy of the test results.

The invention discloses a method for treating activated carbon adsorbing cyanide. The method comprises: 1. putting activated carbon subjected to the cyanide chloride and hydrocyanic acid protection time test in a beaker, adding 400mL of deionized water into each 100g of activated carbon, weighing 10g of calcium hypochlorite, adding the calcium hypochlorite into the solution along with stirring, adding 0.05g of sodium hydroxide into the system in each process until pH of 10, putting the breaker into an ultrasonic oscillator, adjusting power to 250w, carrying out vibration for 60min, adding a monopotassium phosphate-sodium hydroxide buffer solution into the system, adjusting pH to 6.0, adjusting power to 250w and carrying out vibration for 60min, and 2, adding a filtered sample into deionized water and carrying out secondary extraction so that the cyanide content of activated carbon is less than or equal to 0.015mg / g and the cyanide content of the waste liquid is less than or equal to 0.5mg / L. The method realizes integration of the waste liquid treatment and the non-toxic treatment on poisoned activated carbon, has simple and cheap treatment processes and prevents the secondary pollution of the treated wastes.