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Method for preparing submicron hammer ball superfine nickel powder

A sub-micron chain ball-shaped technology, which is applied in the field of preparation of sub-micron chain ball-shaped ultrafine nickel powder, can solve the problems of high carbon content, easy to pollute the environment, and high toxicity, and achieve the effect of low carbon content

Inactive Publication Date: 2011-06-15
DANYANG QIUJING ALLOY STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbonyl nickel thermal decomposition method has advanced technology and stable quality, but there are strict conditions for process equipment and large particle size of nickel powder, while nickel carbonyl is highly toxic and easy to pollute the environment. For example, T255 and T210 have high carbon content and do not meet low-carbon environmental protection requirements, etc. shortcoming
The electrolysis method is widely used in industry, but the nickel powder produced has a large particle size and high energy consumption; the pressurized hydrogen reduction method requires high-pressure reaction equipment, which is costly and complicated to operate

Method used

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  • Method for preparing submicron hammer ball superfine nickel powder
  • Method for preparing submicron hammer ball superfine nickel powder
  • Method for preparing submicron hammer ball superfine nickel powder

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preparation example Construction

[0020] A preparation method of submicron chain-shaped ultrafine nickel powder, in weight percentage, comprising the following steps: 1, preparing nickel chloride solution: 2, preparing nickel carbonate solid: 3, drying; 4, pulverizing: 5, Reduction thermal decomposition.

[0021] 1. Preparation of nickel chloride solution: by figure 1 Known, the process flow diagram of the production of nickel chloride solution of the chain-shaped ultrafine nickel powder of the present invention.

[0022] 1) Pretreatment of nickel raw materials; adding sulfuric acid solution with a concentration of (2-5%) to nickel-containing raw materials to adjust the pH value to 0.5-1. Nickel raw materials can be ore, alloy steel or other nickel-containing solids. React at a temperature of 90°C for 1 hour to dissolve to obtain nickel sulfate solution, the chemical composition of which is shown in Table 1:

[0023] Table 1 Chemical composition of nickel sulfate solution

[0024] Elemental composi...

Embodiment 1

[0047] Put the pure nickel chloride solution in Table 3 and the precipitant solution ammonium bicarbonate into the same reaction kettle, control a certain flow rate, the reaction temperature is 55°C, the pH is adjusted to 6.3, and the precipitate is filtered and washed for 2 hours, and the drying temperature is 120°C. After 12 hours, put the dried nickel carbonate into a box, put it into a PID-regulated electric furnace, control the temperature at 350°C, and carry out reduction thermal decomposition under the control of hydrogen and nitrogen atmospheres to obtain submicron chain-shaped ultrafine nickel powder .

Embodiment 2

[0049] Put the pure nickel chloride solution and precipitant solution ammonium bicarbonate in Table 3 into the same reaction kettle, control a certain flow rate, the reaction temperature is 60°C, the pH is adjusted to 6.5, and the precipitation is filtered and washed for 2 hours, the drying temperature is 120°C, and the time is 10 After hours, put the dried nickel carbonate into a box, put it into a PID-regulated electric furnace, control the temperature at 400°C, and carry out reductive thermal decomposition under the control of hydrogen and nitrogen atmospheres to obtain submicron chain-shaped ultrafine nickel powder.

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Abstract

The invention discloses a method for preparing submicron hammer ball superfine nickel powder, which comprises the following steps of: 1) preparing pure nickel chloride solution; 2) preparing nickel carbonate solution; 3) drying; 4) crushing; and 5) performing reductive thermal decomposition. In the method, the pure nickel chloride solution is used as a raw material, and precipitation reaction is adopted; iron removal with an amarillite method, rough removal of calcium and magnesium with sodium fluoride, secondary extraction and separation and superfine crushing are performed; the reaction is performed under the reductive atmosphere of hydrogen and nitrogen; and the final product has low carbon content and meets the current low-carbon environmentally-friendly requirements. The product accords with international restriction of hazardous substances (ROHS) standards of electronic and electric products, and the production process has no toxicity or pollution and is environmentally-friendly. The removal rate of the calcium and the magnesium reaches 95 percent, the purity of the nickel powder reaches 99.8 percent, the apparent density is low and is 0.5 to 0.6g / cm<3>, and the granular submicron hammer ball superfine nickel powder can meet the requirements of many fields.

Description

technical field [0001] The invention belongs to the technology of preparing metal superfine powder from nickel ore raw materials and secondary nickel compound raw materials. It is a method of acid-dissolving raw materials, coarse impurity removal, fine impurity removal, enrichment, and liquid phase reduction into solid state, and then adjusted in PID. Direct reduction in electric furnace to prepare submicron hammer-shaped ultrafine nickel powder. Background technique [0002] The various excellent physical and chemical properties presented by the ultra-fine materials have brought huge development opportunities and market prospects for the research and development of new materials and the technological transformation of traditional materials and related industries. Ultrafine powders are usually divided into micron, submicron and nanoscale powders. Powder with particle size greater than 1 μm is called micron powder, particle size less than 1 μm and greater than 0.1 μm is call...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
Inventor 袁全火袁全平
Owner DANYANG QIUJING ALLOY STEEL
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