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Method for production of acid from phosphogypsum by utilizing electrolytic-aluminium waste cathode carbon blocks

A waste cathode carbon block, phosphogypsum technology, applied in chemical instruments and methods, inorganic chemistry, cement production and other directions, can solve the problems of inability to achieve strict temperature control, energy waste, secondary pollution, etc., and achieve saving and anti-leakage treatment. and other costs, the economic and environmental benefits are obvious, and the effect of eliminating the impact of the environment

Active Publication Date: 2019-01-29
山东汇泰再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flotation method and sulfuric acid decomposition method cannot remove the cyanide in the waste cathode carbon block, and the cyanide and some fluoride enter the waste liquid and easily cause secondary pollution; the carbon in the waste cathode carbon block is recovered as fuel by the roasting method and burned The heat generated is difficult to use effectively, resulting in a large amount of energy waste, and cannot meet the requirements of strict temperature control in the roasting process
In view of the problems of low recovery rate, serious energy waste, and high recycling cost of the existing waste cathode carbon block recovery methods, it is extremely necessary to study a high-efficiency, energy-saving, and environmentally friendly electrolytic aluminum waste cathode carbon block recycling process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put the phosphogypsum into the hammer dryer, disperse and dry it, and dehydrate it into hemihydrate gypsum; mechanically crush the waste cathode carbon block sorted from the waste residue generated by the overhaul of the electrolytic cell into powder; mix hemihydrate gypsum, clay, The bauxite and electrolytic aluminum waste cathode carbon block powder are mixed and then dried online. After drying, they enter the integrated grinding system for integrated grinding to obtain phosphogypsum cement raw meal. The ratio of C to S in the raw meal is 0.5; put the phosphogypsum cement raw meal into the secondary cyclone preheater, preheat it in nitrogen atmosphere, carry out the primary preheating of the phosphogypsum cement raw meal, raise the temperature of the raw meal to 255°C, and keep it warm for 30min; The gypsum cement raw meal is preheated in the second stage, the temperature of the raw meal is raised to 450 ° C, and the temperature is kept for 30 minutes; the preheated ph...

Embodiment 2

[0032] Put the phosphogypsum into the hammer dryer, disperse and dry it, and dehydrate it into hemihydrate gypsum; mechanically crush the waste cathode carbon block sorted from the waste residue generated by the overhaul of the electrolytic cell into powder; mix hemihydrate gypsum, clay, The bauxite and electrolytic aluminum waste cathode carbon block powder are mixed and then dried online. After drying, they enter the integrated grinding system for integrated grinding to obtain phosphogypsum cement raw meal. The ratio of C to S in the raw meal is 1. Put the phosphogypsum cement raw meal into the secondary cyclone preheater, preheat it in nitrogen atmosphere, carry out the primary preheating on the phosphogypsum cement raw meal, raise the temperature of the raw meal to 350°C, and keep it warm for 45 minutes; The gypsum cement raw meal is preheated in the second stage, the temperature of the raw meal is raised to 750°C, and it is kept for 45 minutes; the preheated phosphogypsum ...

Embodiment 3

[0034]Put the phosphogypsum into the hammer dryer, disperse and dry it, and dehydrate it into hemihydrate gypsum; mechanically crush the waste cathode carbon block sorted from the waste residue generated by the overhaul of the electrolytic cell into powder; hemihydrate gypsum, clay, The bauxite and electrolytic aluminum waste cathode carbon block powder are mixed and then dried online. After drying, they enter the integrated grinding system for integrated grinding to obtain phosphogypsum cement raw meal. The ratio of C to S in the raw meal is 2. Put the phosphogypsum cement raw meal into the secondary cyclone preheater and preheat it in a nitrogen atmosphere, and perform primary preheating on the phosphogypsum cement raw meal, raise the temperature of the raw meal to 450°C and keep it warm for 1 hour; The gypsum cement raw meal is preheated in two stages, the temperature of the raw meal is raised to 780°C, and it is kept for 1 hour; the preheated phosphogypsum cement raw meal i...

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Abstract

The invention discloses a method for applying electrolytic-aluminium waste cathode carbon blocks in combined production of sulfuric acid and cement from phosphogypsum. The method comprises the following steps: smashing the phosphogypsum, carrying out drying and dehydrating so as to obtain hemihydrate gypsum, crushing the electrolytic-aluminium waste cathode carbon blocks into a powder material, mixing the powder material with the hemihydrate gypsum, clay and bauxite, carrying out on-line drying, after completion of drying, carrying out integrated grinding so as to obtain a phosphogypsum cementraw material, preheating the raw material, delivering the preheated raw material into a hollow rotary kiln for decomposition and calcination, subjecting generated SO2-containing gas to gas-solid separation, carrying out dedusting and purifying, then delivering obtained gas into a sulfuric acid system so as to prepare a finished sulfuric acid product, subjecting the raw material to high-temperature calcination so as to obtain a cement clinker, blending the cement clinker with certain amounts of coal cinder and fly ash, and carrying out grinding with a ball mill so as to obtain the cement. Themethod provided by the invention realizes reutilization of the electrolytic-aluminium waste cathode carbon blocks and the phosphogypsum, eliminates the influence of wastes on the environment, saves the cost of occupied land, seepage prevention treatment and the like for waste residue storage at the same time, and has significant economic and environmental benefits.

Description

technical field [0001] The invention relates to a method for producing cement, in particular to a method for producing cement and sulfuric acid with phosphogypsum. Background technique [0002] Phosphogypsum is the industrial waste slag discharged during the wet production of phosphoric acid. For every 1t of phosphoric acid produced, about 4.5t-5t of phosphogypsum is produced. my country's phosphate fertilizer production is increasing at a rate of more than 10% per year, which will lead to an increase in the discharge of phosphogypsum year by year. Long-term accumulation of large amounts of phosphogypsum not only wastes land resources, but also easily causes soil and water pollution, threatening human health. [0003] At present, the reuse of phosphogypsum is mainly through the co-production of cement technology through the production of sulfuric acid from phosphogypsum. The main process of this technology is as follows: firstly, phosphogypsum is dried to remove the crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74C04B7/24C04B7/38
CPCC01B17/745C04B7/24C04B7/38Y02P40/10
Inventor 宋泉王克玉张建浩
Owner 山东汇泰再生资源有限公司
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