54results about How to "Guaranteed leaching rate" patented technology

The invention relates to a spherical nickel protoxide segmented oxidation acid leaching treatment method. The spherical nickel protoxide segmented oxidation acid leaching treatment method comprises the steps of conducting mechanical activation on spherical nickel protoxide and then conducting two-stage countercurrent oxidation and acid leaching on nickel protoxide subjected to mechanical activation; adding pure and acid-soluble materials containing nickel, cobalt and manganese such as acid-soluble ternary precursor waste, nickel powder and cobalt powder to a first-stage leaching agent and adding an appropriate reducing agent or oxidizing agent according to the material properties to consume acid in the leaching agent to allow the pH value to reach up to 4.0 or more to obtain a nickel leaching agent; and applying the acid consumed leaching agent to synthesis of ternary precursors and preparation of high-purity nickel plates, nickel sulfate, nickel chloride crystals and the like. Throughthe spherical nickel protoxide segmented oxidation acid leaching treatment method, the recovery and utilization rate of nickel protoxide is high, the technological process is short, and the method issimple and easy to implement, low in cost, small in investment and obvious in economic and social benefit.

The invention discloses an electroplating sludge recycling technology. The technology comprises the steps of acid dipping, iron removal, copper extraction, impurity removal, zinc extraction, nickel extraction, low acid leaching and high acid leaching, tailings are washed with water, the iron removal step is carried out through a sodium jarosite process, copper extraction adopts two stage extraction, two stage water washing, four stage back extraction, and second stage extraction is carried out after first stage extraction, precipitation, washing and acid dissolution. The technology has the advantages of technological period shortening, guarantee of the product purity through multiple stage extraction, effective use of the waste resource, and reduction of the emission of a waste liquid.

The invention discloses a method for leaching low-nickel high-iron alloy powder selectively through nitric acid. The method comprises the steps that firstly, primary leaching is conducted on the low-nickel high-iron alloy powder through the concentrated nitric acid; when total immersion is ended, magnetic separation is conducted; magnetic separation concentrate is returned for further leaching, so that after remaining ore pulp is filtered, leaching residues and a leaching solution are obtained, and the leaching solution enters a neutralization-for-iron-removal procedure; the low-nickel high-iron alloy powder is added to the leaching solution, so that neutralization for iron removal is conducted; after a neutralization-for-iron-removal reaction is ended, magnetic separation is conducted; magnetic separation concentrate is returned to the primary total immersion procedure, so that after ore pulp is filtered, neutralization iron slag and a separation and immersion solution are obtained; and the neutralization iron slag obtained after filtration is subjected to washing, drying and calcinations, so that an iron ore concentrate product with the iron content ranging from 60% to 65% is obtained. By means of the method, nickel and cobalt leaching and iron removal are completed through one step, and selective leaching of nickel, cobalt and iron is achieved; the nickel and the cobalt enter the solution, and the iron is inhibited in the slag, so that the nickel and the cobalt are effectively separated from the iron; and the leaching rate of the nickel and the cobalt is greater than 98%; the nickel content of the leaching residues is less than 0.5%, the iron content of the leaching residues is less than 10%, and the cobalt content of the leaching residues is less than 0.02%; the iron content of the neutralization iron slag is greater than 50%, and the nickel content o the neutralization iron slag is less than 0.1%; and the iron content of the separation and immersion solution is less than 3 g / L.